Some standard content:
Chemical Industry Standard of the People's Republic of China
HG2576-94
Alkyd Enamel Varnishes of Various Colors
Published on March 17, 1994
Ministry of Chemical Industry of the People's Republic of China
Implemented on January 1, 1995
W Chemical Industry Standard of the People's Republic of China
Alkyd Enamel Varnishes of Various Colors
1 Subject Content and Scope of Application
HG2576-94
Replaces HG2008-91
ZBG51035-87
This standard specifies the technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of alkyd enamels of various colors. This standard applies to alkyd enamels of various colors composed of alkyd resins, driers, pigments and solvents. This product is suitable for the protection and decorative coating of metal and wood surfaces. 2 Reference standards
GB250 Grey scale for evaluating discoloration
GB/T1726
Determination of hiding power of coatings
GB/T1727
GB/T1728
GB/T1765
GB/T1766
GB/T1767
GB/T3186
GB/T6682
GB/ T6742
GB/T6751
General preparation method for paint film
Determination of drying time of paint film and putty film
Preparation method for paint film for determination of moisture and heat resistance, salt spray resistance and weather resistance (artificial acceleration) Rating method for paint film weather resistance
Determination of weather resistance of paint film
Sampling of coating products
Specifications and test methods for water used in analytical laboratories Paint film bending test (cylindrical axis)
Volatilization of paint and varnish Determination of volatile and non-volatile matter GB/T6753.1
GB/T6753.3
Determination of grinding fineness of paint
Test method for storage stability of paint
GB/T6753.4
Determination of outflow time of paint ISO outflow cup method GB/T9271
Standard test panel for paints and varnishes
Determination of resistance of paints and varnishes to liquid media
GB/T927 4
GB9278 Conditioning of coating sample state and test temperature and humidity GB/T9750 Packaging mark of coating products
Paints and varnishes Determination of 20°, 60° and 85° specular gloss of paint films without metallic pigments GB/T9754
GB/T9761
Paints and varnishes Visual colorimetry of paints
1 Solvent oil for rubber industry
SH0004
SH 0005
Solvent oil for paint industry
3 Classification and grading of products
3.1 Classification of products
According to the use, they are divided into the following two types:
Type I is suitable for indoor use.
Type I is suitable for outdoor use.
Approved by the Ministry of Chemical Industry of the People's Republic of China on March 17, 1994 and implemented on May 1, 1995
W.bzsoso.cOm3.2 Product classification
Type I is divided into superior products, first-class products and qualified products. 4 Technical requirements
The product should meet the technical indicators listed in Table 1: Item
State in the container
Workability
Drying time, h
Color and appearance of paint film
Flow time (No. 6 cup), s
Fineness, um
Hiding power?g/m
Red, yellow
Non-volatile matter, %
Black, red, blue
Other colors
Mirror gloss (60°)
Bending resistance (after heating at 120±3℃ for 1h), mmLight resistance
Accelerated yellowing (for white)
Color penetration
Water resistance (immersed in grade 3 water in accordance with GB6682), hHG2576—94
Superior product
Not more than
Not less than
Not more than
Not more than||tt ||Not less than
Not less than
Not more than
Not more than
Resistance to volatile oil (immersed in solvent oil for rubber industry in accordance with SH0004), hWeather resistance (measured after 12 months of natural exposure in Guangzhou)Storage stability, grade
Skinning (24h)
Sedimentation (50±2℃, 30d)
Phenyl anhydride in solvent soluble matter, %
Not less than||tt ||Not less than
3/4 grade
First-class product
Qualified product
No lumps when mixing, uniform spraying without obstacles
Meet the standard and its color difference range, flat and smooth 35
Gloss loss is allowed, color change is not more than gray card level 3
2/3 grade
No color bleeding (white, red, silver omitted test) 18
No blistering, cracking, or peeling. Slight whitening is allowed. The gloss retention rate after immersion in water is not less than 80%
No blistering, wrinkling, cracking, or peeling, slight gloss loss and color change are allowed not exceeding level 4
Powdering does not exceed level 3
Cracks do not exceed level 2
W.5 General conditions for testing
5.1 The test samples shall be sampled in accordance with the provisions of GB3186. HG2576—94
5.2 The sample state adjustment and the test temperature and humidity shall comply with the provisions of GB9278. 5.3 The test sample shall comply with the provisions of GB/T9271. 5.4 The paint film preparation method shall comply with the provisions of GB/T1727 spraying method. 5.5 The paint film performance test in this standard is based on the dry paint film, and its thickness is 23±3um. Unless otherwise specified, the paint film shall be tested after drying for 72 hours under the specified conditions.
6 Test method
6.1 State in the container
Perform according to 4.3 of GB3186.
6.2 Construction performance
The test plate is a tinplate (about 50mm×120mm×0.2~0.3mm). The plate is made by spraying. The test plate should be placed vertically with the long side horizontal and the short side at an angle of about 85°. After applying the first coat of paint, apply the second coat of paint after drying for 24 hours. If there is no particular difficulty in the operation, it can be evaluated as "no obstacle to spraying the second coat". 6.3 Drying time
According to Method A of GB/T1728.
6.4 Paint film color and appearance
According to GB/T9761.
6.5 Flow time
According to GB/T6753.4.
6.6 Fineness
According to GB/T6753.1.
6.7 Hiding power
According to GB/T1726.
6.8 Non-volatile matter
According to GB/T6751.
6.9 Gloss
According to GB/T9754.
6.10 Bending resistance
The test panels are 3 tinplate plates (50mm×120mm×0.2~0.3mm). The samples are dried for 24h under the specified conditions, and then placed in an oven at 120±3℃ for 1h. After the samples are taken out and placed under the specified environmental conditions for 1h, they are tested according to the provisions of GB/T6742. 6.11 Light fastness
See Appendix A.
6.12 Accelerated yellowing
See Appendix B.
6.13 Color penetration
See Appendix C.
6.14 Water resistance
The test panels are 4 tinplate plates (50mm×120mm×0.2~0.3mm). Steel plates (70mm×150mm×0.45~0.55mm) are used for arbitration tests.
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Prepare the paint film according to the spraying method in GB/T1727. Polish the sample according to the provisions of GB/T9271. After drying for 96 hours under the environmental conditions of GB9278, use melted paraffin to wrap the back and periphery of the sample. After the paraffin cools down, use it as a sample. Three of them are used for the test, and one is kept as the original sample until the end of the test.
Water resistance test is in accordance with 5.4. Measure the 60° mirror gloss of the unimmersed upper half of the three samples. Then immerse in grade 3 water of GB/T6682, take out at the specified time, place indoors for 2 hours, and observe with the naked eye whether the coating film has wrinkles, bubbles, peeling and discoloration. After 22 hours of placement, measure the 60° mirror gloss value of the immersed part of the paint film in the same way. Calculate the gloss retention rate of the 60° mirror gloss of the coating film according to formula (1).
60° mirror gloss retention rate (%) = 60° mirror gloss value of condensed water × 100
60° mirror gloss value before immersion
When the degree of change is difficult to evaluate, it should be compared with the paint film of the retained original sample. 6.15 Volatile oil resistance
: (1)
The test panels are 4 tinplate plates (50mm×120mm×0.2~0.3mm). Steel plate (70mm×120mm×0.45~0.55mm) for arbitration test.
Prepare the paint film according to the spraying method in GB/T1727. After drying for 24 hours under the provisions of GB9278, seal the back and periphery of the sample with the original paint, and then place it for 48 hours as a sample. Three of them are used for the test, and one is left as the original sample to be kept until the end of the test. The volatile oil resistance test is carried out according to the provisions of 5.4 in GB/T9274. Immerse the three samples in the qualified product of SH0004 rubber industrial solvent oil, take out the samples according to the time specified in the standard, and check the paint film after standing it upright for 2 hours in the room. When the degree of change is difficult to evaluate, it should be compared with the paint film of the original sample retained.
6.16 Weather resistance
Prepare the paint film according to the paint film preparation method of GB/T1765. Test according to the provisions of GB/T1767. The results shall be evaluated according to the individual evaluation grade regulations in GB/T1766. Exposure shall be carried out in Guangzhou in May every year. 6.17 Storage stability
6.17.1 Sedimentation shall be determined according to 2.1, 2.2 and 2.3 in GB/T6753.3. 6.17.2 Determination of skinning
Pour about 90mL of the sample into a 120mL wide-mouth bottle with a lid and immediately cover the bottle lid. Place the bottle in a dark place for 24 hours, then take out the bottle, open the lid, tilt the bottle and touch the surface of the sample with a glass rod to check the fluidity of the surface layer. If the surface layer still shows liquid, it is evaluated as "no skinning". 6.18 Phthalic anhydride content in solvent soluble matter
See Appendix D.
7 Inspection rules
7.1 Inspection classification
7.1.1 Type inspection
All technical indicators listed in this standard are type inspection items. In normal production, skinning, bending resistance, water resistance, and resistance to volatile oils are inspected once a month, and non-volatile matter, light resistance, and yellowing are inspected once every six months. Sedimentation in storage stability, phthalic anhydride content in solvent-soluble matter, and weather resistance are inspected when the national quality supervision and inspection agency proposes type inspection requirements. 7.1.2 Factory inspection
The factory inspection items in this standard are the state in the container, construction, drying time, paint film color and appearance, outflow time, fineness, hiding power, mirror gloss, and color penetration. Each batch must be inspected. 7.2 The quality inspection department of the manufacturer shall inspect the products according to the provisions of the standard. The manufacturer shall ensure that all products shipped meet the technical indicators of this standard. The product shall have a certificate of conformity. Instructions for use shall be attached when necessary. 7.3 The receiving department has the right to inspect the product quality according to the provisions of this standard. If the product quality is found to be inconsistent with the standard technical indicators, the supply and demand parties shall re-sample and re-test according to the provisions of GB3186. If it still does not meet the provisions of this standard, the product is unqualified and the receiving department has the right to return it.
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7.4 The product is sampled according to GB3186, and the sample should be divided into two parts, one sealed and stored for reference, and the other as an inspection sample. 7.5 When the supply and demand parties check and verify the product packaging quantity and marking, if the packaging is damaged or leaking, the quantity is inconsistent, and the marking does not meet the requirements, it is considered that the acceptance is unqualified and the relevant departments shall be notified in time. 7.6 When the supply and demand parties have a dispute over product quality, the product quality supervision and inspection agency may conduct arbitration tests. 8 Marking, packaging, transportation and storage
8.1 Marking
Carry out according to the provisions of GB/T9750.
8.2 Packaging
The product should be packed in clean, dry, sealed containers without mechanical impurities. 8.3 Transportation
During transportation, the product should be protected from rain and sunlight, and should comply with the relevant regulations of the transportation department. 8.4 Storage
The product should be stored in a cool, ventilated and dry warehouse. Prevent direct sunlight, isolate from fire and stay away from heat sources. Try to cool down when the temperature is too high in summer.
8.5 Under the conditions specified in 8.3 and 8.4, the effective storage period of the product is one year from the date of production. If the storage period exceeds the limit, it can be inspected according to the items specified in this standard. If it meets the technical requirements, it can still be used. 5
W.A1Overview
HG2576—94
Appendix A
Lightfastness Determination Method
(Supplement)
Lightfastness is also called color stability, which is expressed by the degree of color fading. The fading test is to irradiate the paint film with the light of a mercury lamp. Check the ease of color change of the paint film. Each irradiation time is 20 hours, and the cumulative irradiation time is up to 100 hours. This test is mainly used for indoor coatings. A2Lightfastness Tester
The lightfastness instrument is used to check the ease of color change of the paint film. A3Sample
According to the method specified in GB/T9271, apply the sample on one side of the glass plate (100mm×50mm×2mm), then place the sample horizontally with the coated surface facing up, and dry, store, and make the sample according to the method specified in the paint standard. The number of samples is one for irradiation and one for storage. The preserved samples should be placed indoors to prevent discoloration. A4 irradiation testbZxz.net
The painted surface of the sample faces the mercury lamp and is fixed to the fixed cabinet of the cylinder of the irradiation device. The cylinder or mercury lamp is rotated by power, and then the mercury lamp is lit to make the light shine on the sample. The sample is removed every 20 hours, and the irradiated surface is compared with the painted surface of the preserved sample plate. Visually inspect the paint surface from the normal direction under scattered light to see if there is color difference and the size of the color difference. After 100 hours, the test is terminated and the irradiated sample is removed. Assessment
Compare the removed irradiated sample with the preserved sample, and use the GB250 gray sample card for color change assessment to rate. Appendix B
Accelerated yellowing (to white) determination method
(Supplement)
B1 Overview
Determine the color of the paint film after the accelerated test. The yellowness is calculated from the measured tristimulus values to indicate the tendency of the paint film color of the white paint to turn yellow in dark and high humidity air. B2 Measurement device
A photoelectric colorimeter is used as the measurement device.
B3 Measurement method
The sample is applied to one side of a glass plate (120mm×90mm×2～3mm), then placed to dry, and coated with a paint film preparation device with a spacing of 100um. The sample is placed horizontally, dried, and stored under constant temperature and humidity test conditions to prepare a sample. The sample is placed with the painted surface facing up in the upper part of a desiccator filled with a saturated potassium sulfate solution (Note 1), and placed at 232℃ for 48 hours. The sample is taken out and placed for 1 hour and then measured immediately. The tristimulus values X, Y, and Z of the coating color are obtained by direct reading with a photoelectric colorimeter. Note 1: The entire desiccator is painted black to avoid light, and the lower part of the desiccator is filled with more than 500mL of saturated potassium sulfate solution, and the liquid level of the solution should be below the middle of the desiccator.
Ww.bzsoso：comB4 Calculation
HG2576—94
Calculate the yellowing degree value (D) according to formula (B1), and round off the third decimal place of the calculated value according to the numerical rounding method. D=1.28x-1.06z
Where: D——yellowing degree;
X, Y, Z——color tristimulus values.
Appendix C
Color bleeding test method
(Supplement)
c1 Overview
Check whether discoloration caused by bleeding occurs when another layer of white paint is applied on the coating film. C2 Test method
According to the provisions of GB/T9271, the sample is coated on one side of two glass plates (120mmX90mm×2～3mm), placed horizontally, and stored dry under constant temperature and humidity conditions for 48 hours. Then, after re-coating with an alkyd white paint, it is placed horizontally and stored dry under constant temperature and humidity conditions for 48 hours. The sample is inspected with the naked eye under scattered sunlight to see whether discoloration caused by part of the sample coating film components being dissolved and seeping into the coating film of the white paint occurs. C3 Assessment
If no color change due to bleeding is observed on the white paint film of the test plate, it is assessed as "no bleeding". Appendix D
Content of Phthalic Anhydride in Solvent Soluble Matter
(Supplement)
D1 Summary
Dissolve the solvent soluble matter in benzene, add potassium hydroxide-alcohol solution for saponification, filter the resulting precipitate with a glass filter, wash with an equal volume mixture of alcohol and ether, and dry at 130-150°C to constant weight. The mass of potassium phthalate is obtained from the weight gain of the glass filter, and the percentage of phthalic anhydride is converted.
D2 Determination method
D2.1 Sample treatment
Weigh about 10g of sample (accurate to 0.002g) in a centrifuge tube of known mass, add about 20mL of toluene, mix well with a glass rod, use toluene to wash the solids adhering to the glass rod into the centrifuge tube as much as possible, and then add solvent until the volume of the liquid is 40mL. In order to prevent the solvent from volatilizing, cover the centrifuge tube with a suitable stopper, place it in a centrifuge to separate the solids, pour out the supernatant in the centrifuge tube, and then repeat the above process, put the first and second supernatants obtained by separation into a 300mL conical flask, heat it in a water bath to evaporate the solvent, and weigh the total solid content of the sample according to the GB/T6751 method. D2.2 Quantitative analysis
Accurately weigh about 7g (accurate to 0.002g) of the sample obtained in D2.1, put it into a 300mL conical flask, add 10-50mL toluene, install a reflux condenser with a calcium chloride ball to dissolve it, then add 150mL 0.5mol/L potassium hydroxide-anhydrous ethanol solution (the solution 7
W.bzsoso:comHG2576-94
must be left to stand for 24h before taking the upper clear liquid), cover it and install the condenser, keep it at 60℃ on a water bath for 1h, slowly heat and boil for 3h, let it stand for 1h, wash the inner wall of the conical flask with 50mL ether, inject the precipitate into a glass filter of known mass, and wash the precipitate 5 times with 10mL of an equal volume mixture of ether and alcohol each time.
Dry the glass filter at about 60℃ for 20min, and then dry it at 130150℃ to constant weight. After cooling in a dryer, weigh it and find the amount of precipitation. If the precipitation is dirty, wash it 4 times with 20 mL of water at about 80°C each time. Dry the washing liquid at 105-110°C and weigh the residue as the water-insoluble matter. D3 Calculate
Phthalic anhydride in solvent soluble matter (%) Calculate according to formula (D1) CX0.611
X100×100
Where: A——Phenic anhydride in solvent soluble matter, %; C——Mass of precipitation, g;
0.611——Mass of phthalic anhydride equivalent to 1g of potassium phthalate, g; S—Mass of sample, g;
B——Total solid content of sample, %.
However, if the precipitate is dirty and has been filtered with water, the correction value of phthalic anhydride is calculated using formula (D2): (CD)X0.611
X100X100.
SXB-DX100
Wherein: A'——correction value of phthalic anhydride in solvent soluble matter, %, c——mass of precipitate, g,
D——mass of residue (water insoluble matter) after water washing, g; s——mass of sample, g;
B——total solid content of sample, %.
Appendix E
Construction reference
(reference)
(D2)
E1 After fully stirring the product, use brushing and spraying methods on the metal or wood surface coated with primer. The thickness of each spray layer should be 15-20um. The next layer can be applied only after the previous layer is dry. E2 X-6 alkyd paint thinner can be used to adjust the viscosity of the original paint. E3 The matching primers are alkyd primer, alkyd surface primer, epoxy ester primer, phenolic primer, etc. E4 The water resistance of the paint film can be significantly improved after baking at 60~70℃ for 3h. E5 In order to prevent surface crusting during use, the remaining paint surface can be covered with a small amount of turpentine or SH0005 paint industry solvent oil. Additional notes:
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. This standard was drafted by Tianjin Paint Factory and the Paint Industry Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Lu Xiumin, Fei Jinhao, Wang Peiming, and Liu Jiyuan. The superior products in this standard are equivalent to the Japanese Industrial Standard JISK5572-83 (1992 version) "Alkyd Resin Enamel". 8
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SXB-DX100
Where: A'——phthalic anhydride correction value in solvent soluble matter, %, c——mass of precipitate, g,
D——mass of residue (water insoluble matter) after washing, g; s——mass of sample, g;
B——total solid content of sample, %.
Appendix E
Construction reference
(reference)
(D2)
E1After the product is fully stirred, it is applied by brushing and spraying on the metal or wood surface coated with primer. The thickness of each spray layer is preferably 15-20um. The next layer can be applied only after the previous layer is dry. E2X-6 alkyd paint thinner can be used to adjust the viscosity of the original paint. E3The matching primers are alkyd primer, alkyd secondary primer, epoxy ester primer, phenolic primer, etc. The water resistance of E4 paint film can be significantly improved after baking at 60~70℃ for 3h. E5 To prevent surface crusting during use, the remaining paint surface can be covered with a small amount of turpentine or SH0005 paint industry solvent oil. Additional notes:
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. This standard was drafted by Tianjin Paint Factory and the Paint Industry Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Lu Xiumin, Fei Jinhao, Wang Peiming, and Liu Jiyuan. The superior products in this standard are equivalent to the Japanese Industrial Standard JISK5572-83 (1992 version) "Alkyd Resin Enamel Paint". 8
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SXB-DX100
Where: A'——phthalic anhydride correction value in solvent soluble matter, %, c——mass of precipitate, g,
D——mass of residue (water insoluble matter) after washing, g; s——mass of sample, g;
B——total solid content of sample, %.
Appendix E
Construction reference
(reference)
(D2)
E1After the product is fully stirred, it is applied by brushing and spraying on the metal or wood surface coated with primer. The thickness of each spray layer is preferably 15-20um. The next layer can be applied only after the previous layer is dry. E2X-6 alkyd paint thinner can be used to adjust the viscosity of the original paint. E3The matching primers are alkyd primer, alkyd secondary primer, epoxy ester primer, phenolic primer, etc. The water resistance of E4 paint film can be significantly improved after baking at 60~70℃ for 3h. E5 To prevent surface crusting during use, the remaining paint surface can be covered with a small amount of turpentine or SH0005 paint industry solvent oil. Additional notes:
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. This standard was drafted by Tianjin Paint Factory and the Paint Industry Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Lu Xiumin, Fei Jinhao, Wang Peiming, and Liu Jiyuan. The superior products in this standard are equivalent to the Japanese Industrial Standard JISK5572-83 (1992 version) "Alkyd Resin Enamel Paint". 8
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