Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2884—1997
Epoxy bitumen anti-corrosion coatings (multi-pack)
Tar epoxy anti-corrosion paints (multi-pack)）Published on April 21, 1997bzxz.net
Ministry of Chemical Industry of the People's Republic of China
Implemented on October 1, 1997
WHG/T2884—1997
This standard is formulated based on the Japanese Industrial Standard JIKK5664—1983 Tar Epoxy Resin Coatings. This standard is equivalent to JIKK5664—1983, and the difference is that: the name of the item "heating residue of mixed coating" is changed to "non-volatile content", which is based on the concept usually expressed in my country's coating product standards, and the name "non-volatile content" is adopted. Its technical indicators and test methods are exactly the same as JIKK5664-1983. _In the "wet heat resistance" test conditions, the temperature is changed from 50℃ to (47+1)℃, which is in accordance with the provisions of GB/T1740-79 (89) of my country's paint film wet heat resistance determination method, and its technical indicators are exactly the same as JIKK5664-1983. 1. Test conditions, according to GB9278-88 (equivalent to ISO3270:1984). This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for Standardization of Paints and Pigments. The responsible drafting units of this standard are: Tianjin Dengta Paint Co., Ltd., Shanghai Kailin Paint Factory, Guangzhou Huangpu Guangyuan Paint Factory, Wujin Furong Anticorrosive Material Factory, Jiangsu Lanling Chemical (Group) Company. The drafting organizations of this standard include: Changzhou Paint and Chemical Research Institute of the Ministry of Chemical Industry, Wujin Kaixing Paint Factory, Tongling Anticorrosion and Waterproof Material Factory, Wuxi Paint Factory, Wuhan Shuanghu Paint Co., Ltd., Dalian Paint Factory, Shenyang Paint Factory Qingdao Paint Factory, 725th Research Institute of China State Shipbuilding Corporation, Hunan Jinsheng Chemical Anticorrosion Research Center. The main drafters of this standard include: Lu Xiumin, Su Mei, Zhou Jinlin, Ou Boxing, He Rutang, Zhou Rongxing, Gao Xintian. 1
WW.bzsoso.cOmFree download of various US standard industry dataICS87.040
Record number 461—1997
Chemical Industry Standard of the People's Republic of China
Epoxy bitumen anti-corrosion coatings (multi-pack)
Tar epoxy anti-corrosion paints(multi-pack)1Scope
HG/T2884—1997
This standard specifies the requirements, test methods, signs, labels and packaging of epoxy bitumen anti-corrosion coatings (multi-pack). This standard is applicable to two-component epoxy bitumen primer and topcoat anti-corrosion coatings (including ordinary type and thick film type) made of epoxy resin and coal tar asphalt as paint base, pigments, body pigments, solvents, additives and curing agents. This coating is mainly used for heavy anti-corrosion coating of underwater and underground steel structures.
2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. GB/T1728-79 (89) Determination of drying time of paint and putty films GB/T1732-93 Determination of impact resistance of paint films GB/T1740-79 (89) Determination of moisture and heat resistance of paint films GB/T1771-91 Determination of neutral salt spray resistance of paints and varnishes (eqvISO7253:1984) GB3186-82 (89) Sampling of coating products (neqISO1512:1974, etc.) GB/T6742-86
Paint film bending test (cylindrical shaft) (neqISO1519:1973) GB/T6751-86
GB/T 9271—88
Determination of volatile and non-volatile matters in paints and varnishes (eqvIS1515:1973) Standard test panels for paints and varnishes (eqvISO1514:1984) GB/T9274—88
Determination of resistance of paints and varnishes to liquid media (eqvISO2812:1974) 3 Conditioning of paint sample state and temperature and humidity for testing (eqvISO3270:1984) GB9278—88
GB/T9750—88 Packaging marking for paint products GB/T13491—92 General rules for packaging of paint products HG/T2—1611—85 Method for determination of oil resistance of paint film 3 Requirements
The product performance shall comply with the provisions of Table 1.
Approved by the Ministry of Chemical Industry of the People's Republic of China on April 21, 1997 and implemented on October 1, 1997
State of Wbzsoso.cOn in the container
Miscibility
Workability
Drying time, h
Appearance of coating
Application period, h
Bending resistance, mm
Impact resistance, cm
Non-volatile content 1, %
Testing of epoxy resin
HG/T2884—1997||t t||Performance requirements
Hot and cold alternating test (withstand three cycles of hot and cold alternating between -20℃ and 80℃) Alkali resistance 1 (immersed in NaOH solution 5 (W/V)%), 168h Acid resistance 2 [immersed in H2SO solution 5 (W/V)%), 168h Volatile oil resistance (immersed in petroleum ether/toluene = 8/2), 48h Oil resistance (immersed in kerosene), 168h
Moisture and heat resistance? [Temperature (47±1)℃, relative humidity (96±2)%), 120h Salt spray resistance, 120h
1) Aluminum powder paint has no alkali resistance requirements.
2) Aluminum powder paint has no acid resistance requirements.
4 Test method
4.1 Sampling
Adoption instructions:
1JJISK5664 is called "heating residue of mixed coating". 2JJISK5664 temperature is 50℃.
Ordinary type
Thick film type
After stirring and mixing, there is no hard block and it is in a uniform state. It can be mixed evenly
No obstacles in spraying
No obstacles in airless spraying
Normal appearance of coating
Epoxy resin exists
No abnormality in coating
No blistering, no peeling, no rust
WHG/T2884—1997
Products are sampled according to GB3186. The samples are divided into two parts, one is sealed and stored for future reference, and the other is used as a sample for inspection. If it is found that the product quality does not meet the requirements of the indicators in this standard, the supply and demand parties will jointly re-sample and re-test according to GB3186. If it still does not meet the requirements of the indicators in this standard, the product is unqualified. 4.2 Test conditions
According to GB92783.
4.3 Preparation of test specimens
4.3.1 The test base plate is processed according to the provisions of GB/T9271. Except for the tinplate (size 150mm×50mm×0.3mm) for the bending resistance test, the rest are steel plates (size 150mm×70mm×1mm unless otherwise specified), and sandblasted to a cleanliness level of Sa2.
4.3.2 For the ordinary type, the workability, appearance of the coating, bending resistance, impact resistance, and the paint film are sprayed once with a thickness of 45~50μm, and the primer and topcoat are measured separately. For the thick film type, the workability, appearance of the coating, and the paint film are sprayed once with a thickness (wet film) of 0.2~0.4mm; bending resistance and impact resistance are sprayed once with a paint film thickness of 0.1~0.12mm, and the primer and topcoat are measured separately. 4.3.3 For the common type, the hot and cold alternating test, alkali resistance, acid resistance, volatile oil resistance, oil resistance, salt spray resistance, and heat and humidity resistance, the paint film is sprayed in two coats (one primer and one topcoat, matched), and the total thickness of the paint film is 90100μm; for the thick film type, the hot and cold alternating test, alkali resistance, acid resistance, volatile oil resistance, oil resistance, salt spray resistance, and heat and humidity resistance, the paint film is sprayed in one coat (one primer and one topcoat, matched), and the total thickness of the paint film is 0.25~0.35mm (the thickness of each coat is about 0.12~0.15mm). 4.3.4 For the common type and thick film type, in the primer and topcoat matching test, if no primer is applied, two coats of topcoat are applied. 4.3.5 When mixing the main paint and curing agent, a covered container should be used, the mixture should be placed in the container, the lid should be closed, and it should be left for 30 minutes. 4.3.6 After the test panel is painted, unless otherwise specified, it should be left for 7 days before testing. 4.3.7 In the test method, 4.14~4.20 are for base and topcoat. Test is conducted after matching.4 State in the container
Open the container and stir with a spatula or a stirring rod. Allow sediment to form at the bottom of the container. If it is easy to mix evenly after stirring, it is rated as "no hard lumps and uniform state after stirring and mixing".
4.5 Miscibility
Mix the main paint and curing agent according to the ratio specified in the product. If it is easy to stir evenly with a glass rod, it is considered to be "uniformly mixed". 4.6 Construction
Spray the sample (the paint film thickness is as specified) on a steel plate of about 500mm×200mm×1mm. The pressure is 0.4~0.6mPa each time, the compression ratio is 1:23 or more, the spray gun nozzle spray volume is 0.96~2.30L/min, the moving speed of the spray gun is 0.8~1m/s, the distance between the spray gun and the test plate is 30~40cm, and the temperature during spraying is 10~30℃. After spraying to the specified thickness, place it for 10 minutes and observe the painted surface. If no sagging is seen, it is considered to be "no obstacle to airless spraying construction". For ordinary specimens, use the spraying method to make the plate. If there is no special difficulty in the operation, it can be evaluated as "no obstacle to spraying". 4.7 Drying time
According to Method A in Chapter 3 of GB/T1728. 4.8 Appearance of the coating
After the test plate is painted, place it for 48 hours and evaluate it. Visually inspect the painted surface under scattered sunlight. If the paint film is flat and there is no obvious visible sagging, wrinkling, or pinhole phenomenon, it is considered to be "normal appearance of the coating". 4.9 Pot life
Put the mixed sample (about 250mL) into a tinplate can or glass bottle with a capacity of about 300mL and an inner diameter of 70-80mm. After 3 hours, check the contents in the container. If there is no pigment precipitation after stirring or it is easy to disperse evenly after stirring, and the viscosity does not increase significantly and there is no gelling compared with the just mixed, it is considered to be "usable" and the application period is qualified. 4.10 Bending resistance
Perform according to GB/T6742.
4.11 Impact resistance
Perform according to GB/T1732.
4.12 Non-volatile content
Mix the product components in the specified proportion and test according to GB/T6751. 4.13 Test of epoxy resin
4.13.1 Separation of epoxy resin
Take 50g of sample, place it in a 500mL beaker, add 300mL of mixed solvent (ether: toluene: methanol: acetone = 10:6:4:1 volume ratio) and stir thoroughly. Put the solution into a centrifuge to precipitate the solvent insoluble matter. Put the supernatant into a 500mL Erlenmeyer flask with a stopper, add about 30g of granular activated carbon, leave it for 24h, then add another 30g of granular activated carbon, and filter it with qualitative filter paper after 2h. Distill this solution and concentrate it to about 20mL, and use the concentrated solution as the analysis sample. However, in the case where the qualitative analysis in 4.13.2 can be carried out, the separation of activated carbon can also be omitted. 4.13.2 Infrared spectroscopy
Apply the sample obtained in 4.13.1 on a NaCl plate, wait for the solvent to evaporate, and then measure it by infrared spectroscopy. Then compare the infrared absorption spectrum of the sample with the infrared absorption spectrum of epoxy resin (see Figure 1) to check whether there is the characteristic absorption of epoxy resin listed in Table 2.
Xuzhibaibange
2011e0
Effective sensitivity (en-\)
Figure 1 Infrared absorption spectrum of epoxy resin
Table 2 Characteristic absorption of epoxy resin
Absorption peak number
Number (cm-1)
Wavelength (μum)
If the infrared absorption spectrum of the sample is similar to the infrared absorption spectrum of epoxy resin shown in Figure 1, and the characteristic absorption (peak) listed in Table 2 can be seen in the spectrum of the sample, it is considered that "epoxy resin exists" in the sample. 4.14 Hot and cold alternating test
Make 3 test panels, place them in a thermostat at (-20±2)℃, place them horizontally with the painted surface facing upward for 1 hour, take them out and place them in a room at (23±2)℃ for 30 minutes, then place them in a thermostat at (80±2)℃ for 1 hour in the same way as before, 4
W.HG/T2884—1997
Take them out and place them in a room at (23±2)℃ for 30 minutes. Repeat this operation for two more rounds. Check the coating film. If no bubbling, cracking or peeling is observed on more than 2 of the 3 test panels, it is considered that "the coating film is normal". 4.15 Alkali resistance
Apply two coats of the sample (24h interval) on both sides of the steel plate, leave it for 24h, and re-coat the sample with a width of more than 5mm on the coating film around the plate to encapsulate it, and leave it for another 6d. Then immerse the periphery of the plate in a mixture of molten paraffin and rosin in a ratio of 1:1, overlap about 3mm for the first time, and overlap about 5mm for the second time to encapsulate it. After leaving it for 1h, immerse the sample in NaOH solution [5 (W/V)%, and test it according to GB/T9274. If the coating film of more than 2 of the 3 test samples does not show bubbling, peeling and dissolution, it is considered that "there is no abnormality in the paint film immersed in alkali".
4.16 Acid resistance
The preparation of the test sample is the same as 4.15. Immerse it in sulfuric acid [5 (W/V)%, and test it according to GB/T9274. If no blistering, peeling or rusting is observed on more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in acid". 4.17 Volatile oil resistance
Apply two coats of test specimens (24h interval) on each side of the three steel plates and leave for 24h. Coat the periphery of the sample with the test specimen, overlapping by more than 5mm, and leave for 6d. Immerse the test specimen in volatile oil with a ratio of petroleum ether toluene of 8:2 for 48h and test according to 5.4 of GB/T9274-88. If no wrinkling, cracking, blistering or peeling is observed on more than two of the three test specimens (excluding the periphery of the sample and the 10mm below the interface, the internal position), it is considered that "there is no abnormality in the paint film immersed in volatile oil". 4.18 Oil resistance
The preparation of the test specimens is the same as 4.17. Immerse in kerosene and test according to HG/T2-1611. If no wrinkling, cracking, blistering or peeling is observed on the coating films of more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in kerosene". 4.19 Moisture and heat resistance
The preparation of the test panels is the same as that of 4.17. The test is carried out in accordance with GB/T1740. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "moisture and heat resistant". 4.20 Salt spray resistance
The preparation of the test panels is the same as that of 4.17, and the test is carried out in accordance with GB/T1771. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "salt spray resistant". All performance requirements listed in this standard are type inspection items, among which the state in the container, mixability, drying time, appearance of the coating, bending resistance, impact resistance, and non-volatile content are factory inspection items. Under normal production conditions, at least type inspection shall be carried out every year. The product storage period is one year from the date of production. If it exceeds the storage period, it can still be used if it passes the inspection. 5 Marking, labeling, packaging
5.1 Marking
Perform according to GB/T9750.
5.2 Marking
The product should be accompanied by a label indicating the product's standard number, model, name, net content, quality certification mark, manufacturer name, factory address, production date, batch number, and storage period.
5.3 Packaging
Perform according to GB/T13491.7 Drying time
According to Method A in Chapter 3 of GB/T1728. 4.8 Appearance of coating
After the test plate is painted, place it for 48 hours for evaluation. Visually inspect the painted surface under scattered sunlight. If the paint film is flat and there is no obvious sagging, wrinkling, or pinhole phenomenon, it is considered to be "normal appearance of the coating film". 4.9 Applicable period
Put the mixed sample (about 250mL) into a tinplate can or glass bottle with a capacity of about 300mL and an inner diameter of 70-80mm. After 3 hours, check the contents in the container. If there is no pigment precipitation after stirring or it is easy to disperse evenly after stirring, and it is mixed with the freshly mixed product, it can be used. Instructions:
3JJSK5664 The temperature is (20±1)℃ and the relative humidity is (65±5)%. 3
W.bzsoso.cOmHG/T2884—1997
If the viscosity does not increase significantly and there is no gelling after testing, it is considered to be "usable" and the application period is qualified. 4.10 Bending resistance
According to GB/T6742.
4.11 Impact resistance
According to GB/T1732.
4.12 Non-volatile content
After mixing the product components in the specified proportion, test according to GB/T6751. 4.13 Inspection of epoxy resin
4.13.1 Separation of epoxy resin
Take 50g sample, place it in a 500mL beaker, add 300mL mixed solvent (ether: toluene: methanol: acetone = 10:6:4:1 volume ratio) and stir well. Place the solution in a centrifuge to precipitate the solvent insoluble matter. Place the supernatant in a 500mL Erlenmeyer flask with a stopper, add about 30g of granular activated carbon, leave it for 24h, then add another 30g of granular activated carbon, and filter it with qualitative filter paper after 2h. Distill the solution and concentrate it to about 20mL. The concentrated solution is used as the analysis sample. However, in the case where the qualitative analysis in 4.13.2 can be performed, the separation of activated carbon can also be omitted. 4.13.2 Infrared spectroscopy
Apply the sample obtained in 4.13.1 on a NaCl plate, wait for the solvent to evaporate, and measure it according to the infrared spectroscopy method. Then compare the infrared absorption spectrum of the sample with the infrared absorption spectrum of the epoxy resin (see Figure 1) to check whether there is the characteristic absorption of the epoxy resin listed in Table 2.
Xuzhi Baibange
2011e0
Efficacy and sensitivity (en-\)
Figure 1 Infrared absorption spectrum of epoxy resin
Table 2 Characteristic absorption of epoxy resin
Absorption peak number
Time (cm-1)
Wavelength (μum)
If the infrared absorption spectrum of the sample is similar to the infrared absorption spectrum of the epoxy resin shown in Figure 1, and the characteristic absorption (peak) listed in Table 2 can be seen in the spectrum of the sample, it is considered that "epoxy resin exists" in the sample. 4.14 Hot and cold alternating test
Make 3 test panels, place them in a thermostat at (-20±2)℃, place them horizontally with the painted surface facing upward for 1 hour, take them out and place them in a room at (23±2)℃ for 30 minutes, then place them in a thermostat at (80±2)℃ for 1 hour in the same way as before, 4
W.HG/T2884—1997
Take them out and place them in a room at (23±2)℃ for 30 minutes. Repeat this operation for two more rounds. Check the coating film. If no bubbling, cracking or peeling is observed on more than 2 of the 3 test panels, it is considered that "the coating film is normal". 4.15 Alkali resistance
Apply two coats of the sample (24h interval) on both sides of the steel plate, leave it for 24h, and re-coat the sample with a width of more than 5mm on the coating film around the plate for sealing, and leave it for another 6d. Then immerse the periphery of the plate in a mixture of molten paraffin and rosin in a ratio of 1:1, overlap about 3mm for the first time, and overlap about 5mm for the second time for coating. After leaving it for 1h, immerse the sample in NaOH solution [5 (W/V)%, and test it according to GB/T9274. If the coating film of more than 2 of the 3 test samples does not show bubbling, peeling and dissolution, it is considered that "there is no abnormality in the paint film immersed in alkali".
4.16 Acid resistance
The preparation of the test sample is the same as 4.15. Immerse it in sulfuric acid [5 (W/V)%, and test it according to GB/T9274. If no blistering, peeling or rusting is observed on more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in acid". 4.17 Volatile oil resistance
Apply two coats of test specimens (24h interval) on each side of the three steel plates and leave for 24h. Coat the periphery of the sample with the test specimen, overlapping by more than 5mm, and leave for 6d. Immerse the test specimen in volatile oil with a ratio of petroleum ether toluene of 8:2 for 48h and test according to 5.4 of GB/T9274-88. If no wrinkling, cracking, blistering or peeling is observed on more than two of the three test specimens (excluding the periphery of the sample and the 10mm below the interface, the internal position), it is considered that "there is no abnormality in the paint film immersed in volatile oil". 4.18 Oil resistance
The preparation of the test specimens is the same as 4.17. Immerse in kerosene and test according to HG/T2-1611. If no wrinkling, cracking, blistering or peeling is observed on the coating films of more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in kerosene". 4.19 Moisture and heat resistance
The preparation of the test panels is the same as that of 4.17. The test is carried out in accordance with GB/T1740. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "moisture and heat resistant". 4.20 Salt spray resistance
The preparation of the test panels is the same as that of 4.17, and the test is carried out in accordance with GB/T1771. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "salt spray resistant". All performance requirements listed in this standard are type inspection items, among which the state in the container, mixability, drying time, appearance of the coating, bending resistance, impact resistance, and non-volatile content are factory inspection items. Under normal production conditions, at least type inspection shall be carried out every year. The product storage period is one year from the date of production. If it exceeds the storage period, it can still be used if it passes the inspection. 5 Marking, labeling, and packaging
5.1 Marking
Perform in accordance with GB/T9750.
5.2 Marking
The product should be accompanied by a label indicating the product's standard number, model, name, net content, quality certification mark, manufacturer name, factory address, production date, batch number, and storage period.
5.3 Packaging
Perform in accordance with GB/T13491.7 Drying time
According to Method A in Chapter 3 of GB/T1728. 4.8 Appearance of coating
After the test plate is painted, place it for 48 hours for evaluation. Visually inspect the painted surface under scattered sunlight. If the paint film is flat and there is no obvious sagging, wrinkling, or pinhole phenomenon, it is considered to be "normal appearance of the coating film". 4.9 Applicable period
Put the mixed sample (about 250mL) into a tinplate can or glass bottle with a capacity of about 300mL and an inner diameter of 70-80mm. After 3 hours, check the contents in the container. If there is no pigment precipitation after stirring or it is easy to disperse evenly after stirring, and it is mixed with the freshly mixed product, it can be used. Instructions:
3JJSK5664 The temperature is (20±1)℃ and the relative humidity is (65±5)%. 3
W.bzsoso.cOmHG/T2884—1997
If the viscosity does not increase significantly and there is no gelling after testing, it is considered to be "usable" and the application period is qualified. 4.10 Bending resistance
According to GB/T6742.
4.11 Impact resistance
According to GB/T1732.
4.12 Non-volatile content
After mixing the product components in the specified proportion, test according to GB/T6751. 4.13 Inspection of epoxy resin
4.13.1 Separation of epoxy resin
Take 50g sample, place it in a 500mL beaker, add 300mL mixed solvent (ether: toluene: methanol: acetone = 10:6:4:1 volume ratio) and stir well. Place the solution in a centrifuge to precipitate the solvent insoluble matter. Place the supernatant in a 500mL Erlenmeyer flask with a stopper, add about 30g of granular activated carbon, leave it for 24h, then add another 30g of granular activated carbon, and filter it with qualitative filter paper after 2h. Distill the solution and concentrate it to about 20mL. The concentrated solution is used as the analysis sample. However, in the case where the qualitative analysis in 4.13.2 can be carried out, the separation of activated carbon can also be omitted. 4.13.2 Infrared spectroscopy
Apply the sample obtained in 4.13.1 on a NaCl plate, wait for the solvent to evaporate, and measure it according to the infrared spectroscopy method. Then compare the infrared absorption spectrum of the sample with the infrared absorption spectrum of the epoxy resin (see Figure 1) to check whether there is the characteristic absorption of the epoxy resin listed in Table 2.
Xuzhi Baibange
2011e0
Efficacy and sensitivity (en-\)
Figure 1 Infrared absorption spectrum of epoxy resin
Table 2 Characteristic absorption of epoxy resin
Absorption peak number
Time (cm-1)
Wavelength (μum)
If the infrared absorption spectrum of the sample is similar to the infrared absorption spectrum of the epoxy resin shown in Figure 1, and the characteristic absorption (peak) listed in Table 2 can be seen in the spectrum of the sample, it is considered that "epoxy resin exists" in the sample. 4.14 Hot and cold alternating test
Make 3 test panels, place them in a thermostat at (-20±2)℃, place them horizontally with the painted surface facing upward for 1 hour, take them out and place them in a room at (23±2)℃ for 30 minutes, then place them in a thermostat at (80±2)℃ for 1 hour in the same way as the previous time, 4
W.HG/T2884—1997
Take them out and place them in a room at (23±2)℃ for 30 minutes. Repeat this operation for two more rounds. Check the coating film. If no bubbling, cracking or peeling is observed on more than 2 of the 3 test panels, it is considered that "the coating film is normal". 4.15 Alkali resistance
Apply two coats of the sample (24h interval) on both sides of the steel plate, leave it for 24h, and re-coat the sample with a width of more than 5mm on the coating film around the plate for sealing, and leave it for another 6d. Then immerse the periphery of the plate in a mixture of molten paraffin and rosin in a ratio of 1:1, overlap about 3mm for the first time, and overlap about 5mm for the second time for coating. After leaving it for 1h, immerse the sample in NaOH solution [5 (W/V)%, and test it according to GB/T9274. If the coating film of more than 2 of the 3 test samples does not show bubbling, peeling and dissolution, it is considered that "there is no abnormality in the paint film immersed in alkali".
4.16 Acid resistance
The preparation of the test sample is the same as 4.15. Immerse it in sulfuric acid [5 (W/V)%, and test it according to GB/T9274. If no blistering, peeling or rusting is observed on more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in acid". 4.17 Volatile oil resistance
Apply two coats of test specimens (24h interval) on each side of the three steel plates and leave for 24h. Coat the periphery of the sample with the test specimen, overlapping by more than 5mm, and leave for 6d. Immerse the test specimen in volatile oil with a ratio of petroleum ether toluene of 8:2 for 48h and test according to 5.4 of GB/T9274-88. If no wrinkling, cracking, blistering or peeling is observed on more than two of the three test specimens (excluding the periphery of the sample and the 10mm below the interface, the internal position), it is considered that "there is no abnormality in the paint film immersed in volatile oil". 4.18 Oil resistance
The preparation of the test specimens is the same as 4.17. Immerse in kerosene and test according to HG/T2-1611. If no wrinkling, cracking, blistering or peeling is observed on the coating films of more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in kerosene". 4.19 Moisture and heat resistance
The preparation of the test panels is the same as that of 4.17. The test is carried out in accordance with GB/T1740. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "moisture and heat resistant". 4.20 Salt spray resistance
The preparation of the test panels is the same as that of 4.17, and the test is carried out in accordance with GB/T1771. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "salt spray resistant". All performance requirements listed in this standard are type inspection items, among which the state in the container, mixability, drying time, appearance of the coating, bending resistance, impact resistance, and non-volatile content are factory inspection items. Under normal production conditions, at least type inspection shall be carried out every year. The product storage period is one year from the date of production. If it exceeds the storage period, it can still be used if it passes the inspection. 5 Marking, labeling, and packaging
5.1 Marking
Perform in accordance with GB/T9750.
5.2 Marking
The product should be accompanied by a label indicating the product's standard number, model, name, net content, quality certification mark, manufacturer name, factory address, production date, batch number, and storage period.
5.3 Packaging
Perform in accordance with GB/T13491.1 The obtained sample is coated on a NaCl plate, and after the solvent evaporates, it is measured by infrared spectroscopy. Then the infrared absorption spectrum of the sample is compared with the infrared absorption spectrum of the epoxy resin (see Figure 1) to check whether there is the characteristic absorption of the epoxy resin listed in Table 2.
Xuzhibaibange
2011e0
Effective sensitivity (en-\)
Figure 1 Infrared absorption spectrum of epoxy resin
Table 2 Characteristic absorption of epoxy resin
Absorption peak number
Time (cm-1)
Wavelength (μum)
If the infrared absorption spectrum of the sample is similar to the infrared absorption spectrum of the epoxy resin shown in Figure 1, and the characteristic absorption (peak) listed in Table 2 can be seen in the spectrum of the sample, it is considered that "epoxy resin exists" in the sample. 4.14 Hot and cold alternating test
Make 3 test panels, place them in a thermostat at (-20±2)℃, place them horizontally with the painted surface facing upward for 1 hour, take them out and place them in a room at (23±2)℃ for 30 minutes, then place them in a thermostat at (80±2)℃ for 1 hour in the same way as the previous time, 4
W.HG/T2884—1997
Take them out and place them in a room at (23±2)℃ for 30 minutes. Repeat this operation for two more rounds. Check the coating film. If no bubbling, cracking or peeling is observed on more than 2 of the 3 test panels, it is considered that "the coating film is normal". 4.15 Alkali resistance
Apply two coats of the sample (24h interval) on both sides of the steel plate, leave it for 24h, and re-coat the sample with a width of more than 5mm on the coating film around the plate for sealing, and leave it for another 6d. Then immerse the periphery of the plate in a mixture of molten paraffin and rosin in a ratio of 1:1, overlap about 3mm for the first time, and overlap about 5mm for the second time for coating. After leaving it for 1h, immerse the sample in NaOH solution [5 (W/V)%, and test it according to GB/T9274. If the coating film of more than 2 of the 3 test samples does not show bubbling, peeling and dissolution, it is considered that "there is no abnormality in the paint film immersed in alkali".
4.16 Acid resistance
The preparation of the test sample is the same as 4.15. Immerse it in sulfuric acid [5 (W/V)%, and test it according to GB/T9274. If no blistering, peeling or rusting is observed on more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in acid". 4.17 Volatile oil resistance
Apply two coats of test specimens (24h interval) on each side of the three steel plates and leave for 24h. Coat the periphery of the sample with the test specimen, overlapping by more than 5mm, and leave for 6d. Immerse the test specimen in volatile oil with a ratio of petroleum ether toluene of 8:2 for 48h and test according to 5.4 of GB/T9274-88. If no wrinkling, cracking, blistering or peeling is observed on more than two of the three test specimens (excluding the periphery of the sample and the 10mm below the interface, the internal position), it is considered that "there is no abnormality in the paint film immersed in volatile oil". 4.18 Oil resistance
The preparation of the test specimens is the same as 4.17. Immerse in kerosene and test according to HG/T2-1611. If no wrinkling, cracking, blistering or peeling is observed on the coating films of more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in kerosene". 4.19 Moisture and heat resistance
The preparation of the test panels is the same as that of 4.17. The test is carried out in accordance with GB/T1740. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "moisture and heat resistant". 4.20 Salt spray resistance
The preparation of the test panels is the same as that of 4.17, and the test is carried out in accordance with GB/T1771. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "salt spray resistant". All performance requirements listed in this standard are type inspection items, among which the state in the container, mixability, drying time, appearance of the coating, bending resistance, impact resistance, and non-volatile content are factory inspection items. Under normal production conditions, at least type inspection shall be carried out every year. The product storage period is one year from the date of production. If it exceeds the storage period, it can still be used if it passes the inspection. 5 Marking, labeling, and packaging
5.1 Marking
Perform in accordance with GB/T9750.
5.2 Marking
The product should be accompanied by a label indicating the product's standard number, model, name, net content, quality certification mark, manufacturer name, factory address, production date, batch number, and storage period.
5.3 Packaging
Perform in accordance with GB/T13491.1 The obtained sample is coated on a NaCl plate, and after the solvent evaporates, it is measured by infrared spectroscopy. Then the infrared absorption spectrum of the sample is compared with the infrared absorption spectrum of the epoxy resin (see Figure 1) to check whether there is the characteristic absorption of the epoxy resin listed in Table 2.
Xuzhibaibange
2011e0
Effective sensitivity (en-\)
Figure 1 Infrared absorption spectrum of epoxy resin
Table 2 Characteristic absorption of epoxy resin
Absorption peak number
Time (cm-1)
Wavelength (μum)
If the infrared absorption spectrum of the sample is similar to the infrared absorption spectrum of the epoxy resin shown in Figure 1, and the characteristic absorption (peak) listed in Table 2 can be seen in the spectrum of the sample, it is considered that "epoxy resin exists" in the sample. 4.14 Hot and cold alternating test
Make 3 test panels, place them in a thermostat at (-20±2)℃, place them horizontally with the painted surface facing upward for 1 hour, take them out and place them in a room at (23±2)℃ for 30 minutes, then place them in a thermostat at (80±2)℃ for 1 hour in the same way as before, 4
W.HG/T2884—1997
Take them out and place them in a room at (23±2)℃ for 30 minutes. Repeat this operation for two more rounds. Check the coating film. If no bubbling, cracking or peeling is observed on more than 2 of the 3 test panels, it is considered that "the coating film is normal". 4.15 Alkali resistance
Apply two coats of the sample (24h interval) on both sides of the steel plate, leave it for 24h, and re-coat the sample with a width of more than 5mm on the coating film around the plate for sealing, and leave it for another 6d. Then immerse the periphery of the plate in a mixture of molten paraffin and rosin in a ratio of 1:1, overlap about 3mm for the first time, and overlap about 5mm for the second time for coating. After leaving it for 1h, immerse the sample in NaOH solution [5 (W/V)%, and test it according to GB/T9274. If the coating film of more than 2 of the 3 test samples does not show bubbling, peeling and dissolution, it is considered that "there is no abnormality in the paint film immersed in alkali".
4.16 Acid resistance
The preparation of the test sample is the same as 4.15. Immerse it in sulfuric acid [5 (W/V)%, and test it according to GB/T9274. If no blistering, peeling or rusting is observed on more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in acid". 4.17 Volatile oil resistance
Apply two coats of test specimens (24h interval) on each side of the three steel plates and leave for 24h. Coat the periphery of the sample with the test specimen, overlapping by more than 5mm, and leave for 6d. Immerse the test specimen in volatile oil with a ratio of petroleum ether toluene of 8:2 for 48h and test according to 5.4 of GB/T9274-88. If no wrinkling, cracking, blistering or peeling is observed on more than two of the three test specimens (excluding the periphery of the sample and the 10mm below the interface, the internal position), it is considered that "there is no abnormality in the paint film immersed in volatile oil". 4.18 Oil resistance
The preparation of the test specimens is the same as 4.17. Immerse in kerosene and test according to HG/T2-1611. If no wrinkling, cracking, blistering or peeling is observed on the coating films of more than two of the three test panels, it is considered that "there is no abnormality in the paint film immersed in kerosene". 4.19 Moisture and heat resistance
The preparation of the test panels is the same as that of 4.17. The test is carried out in accordance with GB/T1740. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "moisture and heat resistant". 4.20 Salt spray resistance
The preparation of the test panels is the same as that of 4.17, and the test is carried out in accordance with GB/T1771. If no blistering, flaking or rusting is observed on the coating films of more than two of the three test panels beyond the 3mm on both sides of the line, it is considered to be "salt spray resistant". All performance requirements listed in this standard are type inspection items, among which the state in the container, mixability, drying time, appearance of the coating, bending resistance, impact resistance, and non-volatile content are factory inspection items. Under normal production conditions, at least type inspection shall be carried out every year. The product storage period is one year from the date of production. If it exceeds the storage period, it can still be used if it passes the inspection. 5 Marking, labeling, and packaging
5.1 Marking
Perform in accordance with GB/T9750.
5.2 Marking
The product should be accompanied by a label indicating the product's standard number, model, name, net content, quality certification mark, manufacturer name, factory address, production date, batch number, and storage period.
5.3 Packaging
Perform in accordance with GB/T13491.1 Marking
Perform in accordance with GB/T9750.
5.2 Marking
Products should be labeled with the product's standard number, model, name, net content, quality certification mark, manufacturer's name, address, production date, batch number, and storage period.
5.3 Packaging
Perform in accordance with GB/T13491.1 Marking
Perform in accordance with GB/T9750.
5.2 Marking
Products should be labeled with the product's standard number, model, name, net content, quality certification mark, manufacturer's name, address, production date, batch number, and storage period.
5.3 Packaging
Perform in accordance with GB/T13491.
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