Some standard content:
Chemical Industry Standard of the People's Republic of China
HG/T2594-94
Various Colors of Amino Drying Enamels
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
Various Colors of Hydrogen-Based Drying Enamels
1 Subject Content and Scope of Application
HG/T2594-94
Replaces ZBG51043-87
This standard specifies the technical conditions, test methods, inspection rules, marking, packaging, storage and transportation of various colors of amino drying enamels. This standard applies to products made by dispersing pigments in a mixed solution of alkylated amino resin and alkyd resin as a paint. The products specified in this standard are suitable for metal surfaces such as light industrial products, electromechanical instruments and meters, and toys as colored, opaque decorative protective coatings.
2 Reference standards
GB250 Grey scale for evaluating discoloration
GB/T1726 Determination of hiding power of paint
GB/T1727
GB/T1728
GB/T1729
GB/T1732
GB/T1740
GB/T1765
GB/T1766
GB/T1767
General preparation method for paint film
Determination of drying time of paint film and putty film
Determination of paint film color and appearance Method
Determination of impact resistance of paint film
Determination of moisture and heat resistance of paint film
Preparation method of paint film for determination of moisture resistance, salt spray resistance and weathering resistance (artificial acceleration) Method for rating weathering resistance of paint film
Determination of weathering resistance of paint film
Sampling of coating products
GB3186
GB/T5209
GB/T6682
GB/T6739
GB/T6740
GB/T6742
GB/T6751
Determination of water resistance of paints and varnishes - Immersion method Water for analytical laboratories Specifications and test methods Pencil method for determination of film hardness
Determination of volatile and non-volatile matters in coatings
Bending test for coating films (cylindrical axis)
Determination of volatile and non-volatile matters in paints and varnishes GB/T6753.1
GB/T6753.3
GB/T9271
GB/T9274
Determination of grinding fineness of coatings
Test method for storage stability of coatings
Standard test panels for paints and varnishes
Determination of resistance of paints and varnishes to liquid media
GB9278 Conditioning of coating samples and test temperature and humidity GB/T9750
Packaging mark of coating products
GB/T9754
Determination of 20°, 60° and 85° specular gloss of paint and varnish without metallic pigments GB/T9761
Visual colorimetry of paint and varnish
Approved by the Ministry of Chemical Industry of the People's Republic of China on March 9, 1994 and implemented on January 1, 1995
W.3 Product classification
Divided into three types according to use:
Type I: Applicable to outdoor vehicles, lighting equipment, etc. HG/T2594-94
Type I: Applicable to indoor household appliances, steel furniture, lighting equipment, etc. Type I: Applicable to indoor and outdoor moisture-resistant metal equipment, etc. 4 Technical requirements
The product shall meet the technical requirements listed in Table 1.
State in containerwwW.bzxz.Net
Workability
Drying time, min
Appearance of paint film
Hiding power g/m2
Medium green
Other colors
Gloss, 60°
Impact resistance, cm
Color penetration
Hardness (pencil)
Light resistance
Bending test, mm
Heating test of paint film, 150℃1.5h
Water resistance
40±1℃.72h
40±1℃，24h||t t||Alkali resistance
30(130℃)
Not more than
Not less than
Not small
No lumps after stirring, in a uniform state
No obstacles in spraying the second coat
30(120℃)
Smooth and even
30(130℃
Except for red which is allowed to have slight bleeding, other colors should not have bleedingNot less than
Not more than
40±1C, 5%(m/m)NaC0s24h
Acid resistance
10%(V/V)HS O4 solution 5h
Moisture and heat resistance, 6h
Allowed color change
Not more than gray card level 3
Color and gloss slightly changed and passed 10mm bending testNo abnormality
No abnormality
No abnormality
No blistering, no peeling, compared with
standard samples, its color
color and gloss are not much different
No abnormality
No blistering, no peeling, compared with
standard samples, its color
color and gloss are not much different
No blistering
W. Volatile resistance Oiliness, 4h
Non-volatile matter, %
Dark and other colors
Pollution resistance
Solvent-soluble matter composition:
Nitrocellulose
Phthalic anhydride, %
Nitrogen content, %
Storage stability, 50℃72h
Weather resistance, 12 months
Fineness, um
5General requirements for the test
Not less than
Not less than
Not less than
Not more than
5.1 Sampling shall be carried out in accordance with the provisions of GB3186.
HG/T2594—94
Continued Table 1
No blistering, cracking, peeling, rusting, and the color and gloss change
is not big compared with the standard sample, and the powdering is level 2
5.2 The standard test panel for the test shall comply with the provisions of GB/T9271. Means
No abnormality
No
No blistering, cracking, peeling, rusting, and the color and gloss change
is not big compared with the standard sample, and the powdering is level 2
5.3 The paint film is prepared according to the spraying method in GB/T1727. After spraying, it is placed for 20 minutes and dried under the specified conditions. The dry film thickness is 20~30μm.
5.4 The state adjustment of the paint sample and the temperature and humidity of the test shall be carried out according to the provisions of GB9278. 6 Test method
6.1 State in the container
Open the container and stir the contents with a scraper or a stirring rod. Although there is precipitation at the bottom of the container, stirring the bottom of the container in sequence can loosen the precipitation and make it easy to mix into a uniform state, which can be evaluated as "no lumps after stirring and mixing, and in a uniform state". 6.2 Construction performance
One steel plate of 300mm×150mm×0.45~0.55mm. The long side of the sample is horizontal, and the short side is at an angle of 85° to the horizontal, and it is placed vertically. Use a spray gun to spray the diluted sample evenly on the sample, place it indoors for 20 minutes, and then place it in an oven at the specified temperature to dry for 30 minutes. After taking it out and cooling it, spray the second coat according to the method of spraying the first coat. If the spraying operation is smooth, it can be evaluated as "no obstacle in spraying the second coat". This sample can be kept for checking the appearance of the paint film.
6.3 Drying time
1 piece of tinplate 120mm×50mm×0.2~0.3mm. Place the sprayed sample indoors for 20 minutes, then put it horizontally in a drying oven at a specified temperature with the painted surface facing upward for 30 minutes. Take out the sample and place it for 1 hour, and then measure it according to the actual drying time method A in GB/T1728. 6.4 Appearance of paint film
W.HG/T2594—94
Put the sample with no obstacles sprayed twice in 6.2 Appear for 20 minutes, dry it at the specified temperature for 30 minutes, take it out for 3 hours, and visually check whether it is flat and smooth under scattered sunlight. 6.5 Hiding power
Perform according to the provisions of GB/T1726.
6.6 Mirror gloss
Perform according to the provisions of GB/T9754.
6.7 Impact resistance
Tested on tinplate according to GB/T1732. 6.8 Color penetration
Steel plate 150mm×70mm×0.45~0.55mm1 piece. The topcoat is the same white amino alkyd resin enamel. Spray the sample onto the steel plate, place it horizontally in the room for 20 minutes, dry it at the specified temperature for 30 minutes, and then place it for 1 hour. Spray the same white amino alkyd resin enamel onto the dried color paint film, place it for 20 minutes, dry it at the specified temperature for 30 minutes, and then place it for 1 hour. Visually observe under scattered sunlight whether the sample paint film components are partially dissolved and penetrated into the white paint film to cause changes. Evaluation: If the white paint film of the sample does not show any color change due to color bleeding, it can be evaluated as "no color bleeding". 6.9 Hardness
Perform according to GB/T6739, and evaluate whether the pencil scratches the paint film. 6.10 Lightfastness
See Appendix A.
6.11 Bending test
Perform according to GB/T6742.
6.12 Paint film heating test
4 pieces of tinplate 120mm×50mm×0.2~0.3mm. Grind the sample according to the C method specified in GB/T9271 3.4, spray the sample on the sample, dry it according to the specified time and temperature, one of which is used as a comparison sample, and the other three are baked at 150℃ for 1.5h. After standing for 1h, compare the baked sample with the comparison sample to observe the changes in color and gloss. Then place the baked sample in a dryer for 24h, take it out and immediately perform a bending test on a 10mm diameter shaft according to GB/T6742.
Evaluation: If no cracks or peeling are seen on 2 of the 3 samples, it can be rated as "passed". 6.13 Water resistance
Perform according to GB/T5209.
Evaluation: If two of the three samples do not show wrinkles, bubbling, cracks and peeling during the first and second observations, and the reduction in gloss, darkening and discoloration do not change much during the second observation, it is rated as "no abnormality". 6.14 Alkali resistance
4 steel plates with a size of 150mm×70mm×0.45~0.55mm. According to the 5.4 procedure A of method 5A (immersion method) in GB/T9274, use the single liquid regulations. The test temperature is 40±1℃. The concentration of alkali solution is 5% (m/m).
After the test, take out the sample and rinse it with water immediately. After shaking off the water, place the sample indoors for 2 hours and then check the paint film. If two of the three samples do not show bubbling, cracks, peeling, pinholes, softening and dissolution, and the color and gloss change little compared with the preserved sample, it is rated as "no abnormality".
6.15 Acid resistance
Steel plate 150mm×70mm×0.45~0.55mm4 pieces. Perform the test according to the provisions of 5.4 procedure A of method 5A (immersion method) in GB/T9274 using single-phase liquid. After the test, take out the sample and wash it with water. After shaking off the water, place the sample for 2 hours and then check the paint film. 4
WHG/T2594—94
Assessment: If there is no bubbling, cracking, peeling, pinholes, softening and dissolution on 2 of the 3 samples, and the color and gloss change little compared with the preserved sample, it is rated as "no abnormality". 6.16 Moisture and heat resistance
Steel plate 150mm×70mm×1mm4 pieces.
After preparing the paint film according to the provisions of GB/T1765, the test is carried out according to the provisions of GB/T1740. 6.17 Volatile oil resistance
4 steel plates with a size of 150mm×70mm×0.45~0.55mm. Test according to method 5.4A of GB/T9274. Immerse the sample in SH0005 paint industry solvent oil (mixed solvent oil of toluene = 9:1) for 4 hours, take it out, and compare it with a preserved sample after 2 hours. Check the viscosity of the paint film by finger touch, and check the hardness of the paint film by fingernail scratch.
Evaluation: There are no wrinkles, bubbles, cracks, or peeling on the paint film of 2 of the 3 samples. When compared with the preserved samples, the increase in gloss, color, viscosity and hardness is not large, and the degree of liquid coloration and turbidity is not large, it can be evaluated as "no abnormality". 6.18 Non-volatile matter
Perform according to GB/T6751.
6.19 Pollution resistance
See Appendix B.
6.20 Determination of solvent soluble composition
See Appendix C.
6.21 Storage stability
After storage at 50±2℃ for 72h as specified in GB/T6753.3, first check the sample according to the state in the container in 6.1, then inspect it according to the construction requirements in 6.2, and compare it with the sample before storage. If there is no significant change in the state in the container, construction properties, appearance of the paint film, gloss, etc., and the amount of diluent added during spray dilution does not exceed twice that before storage, it can be rated as "storage stable". 6.22 Weather resistance
Prepare the paint film according to GB/T1765, test it according to GB/T1767, and rate it according to the single item evaluation grade provisions of GB/T1766. Exposure begins in Guangzhou in May every year.
6.23 Fineness
Perform according to GB/T6753.1.
7 Inspection rules
7.1 Inspection classification
7.1.1 Type inspection
All technical indicators listed in this standard are type inspection items. Under normal production conditions, water resistance, alkali resistance, acid resistance, and volatile oil resistance are inspected every two months; paint film heating test, non-volatile matter, color penetration, and moisture and heat resistance are inspected every six months; storage stability, weather resistance, light resistance, and solvent soluble composition are inspection items instructed by the superior quality supervision department. 7.1.2 Factory inspection
The factory inspection items in this standard are the state in the container, construction performance, drying time, hiding power, gloss, impact resistance, hardness, bending test, and fineness. Each production batch is inspected. Tinplate is allowed to be used in daily inspection, and steel plate is used in arbitration. 7.2 The product shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all products leaving the factory meet the requirements of this standard. The product shall have a certificate of conformity and, if necessary, an instruction manual. 7.3 The receiving department has the right to inspect the product quality in accordance with the provisions of this standard. If the product quality does not meet the requirements of this standard, the supplier and the buyer shall jointly resample and retest in accordance with the provisions of GB3186. If it still does not meet the requirements of this standard, the product shall be considered unqualified and the receiving department shall have the right to return the product.
7.4 The product shall be sampled in accordance with the provisions of GB3186. The sample shall be divided into two parts, one for sealed storage and future reference, and the other for inspection. 5
HG/T2594—94
7.5 The supplier and the buyer shall check and verify the product packaging, quantity and marking. If the packaging is damaged or leaking, the quantity is inconsistent, or the marking does not meet the requirements, the acceptance shall be considered unqualified and the relevant departments shall be notified in time for handling. 7.6 When a dispute arises between the supply and demand parties over product quality, the product quality supervision and inspection agency shall conduct arbitration inspection. 8 Marking, packaging, purchase, storage and transportation
8.1 Marking
Perform in accordance with GB/T9750.
8.2 Packaging
The product shall be packed in a clean, dry, sealed container without mechanical impurities, and the volume of the content shall be 95%. The volume of the content shall be determined in accordance with GB/T6752, and then the volume percentage V (%) of the content in the container shall be calculated according to formula (1). V(%)
Where: V1-the volume of the sample in the container, mL V2-the volume of the packaging container, mL.
8.3 Storage
The product shall be stored in a cool, ventilated, dry warehouse, protected from direct sunlight, isolated from fire and away from heat sources. When the temperature is too high in summer, efforts should be made to reduce the temperature.
8.4 Transportation
During transportation, the product should be protected from rain, sunlight, collision, and should comply with the relevant regulations of the transportation department. 8.5 The product should comply with 8.2 and 8.3, the effective storage period is one year from the date of production. If the storage period exceeds the period, it can be inspected according to the items specified in this standard. If the results still meet the technical requirements of this standard, it can still be used. 6
WA1 Overview
HG/T2594-94
Appendix A
Lightfastness Determination Method
(Supplement)
Lightfastness is also called color stability. It is expressed by the degree of color fading. The fading test is to test the ease of color change of the paint film after irradiating the paint film with the light of a mercury lamp. The irradiation time for each time is 20 hours, and the cumulative irradiation time is up to 100 hours. This test is mainly suitable for indoor coatings. A2 Lightfastness Tester
The lightfastness tester is used to test the ease of color change of the paint film. A3 Test plate
According to the method specified in GB/T9271, the sample is applied on one side of the glass plate (100mm×50mm×2mm), and the coating is placed horizontally with the coating film facing upwards. The coating film is dried according to the sample standard to make a sample plate. The sample plate is made of two pieces, one for light resistance irradiation test and the other for reference standard plate.
A4 Irradiation test
The painted surface of the sample plate faces the mercury lamp and is fixed on a fixed cabinet of the irradiation cylinder. The cylinder or mercury lamp is rotated by power, and the mercury lamp switch is turned on to irradiate the sample plate. Every 20 hours, the sample plate is removed and compared with the paint surface of the preserved reference plate. The sample plate paint film is visually inspected from the normal direction under scattered light to see if there is color difference and the size of the color difference. The test is terminated after 100 hours, and the irradiated sample plate is removed. A5 Assessment
Compare the removed irradiated sample plate with the preserved reference plate, and rate it using the gray sample card for color change assessment in accordance with GB250. Appendix B
Pollution resistance
(Supplement)
After preparing three samples according to the provisions of 5.4 of this standard, place them indoors for 2 hours, drop the test solution agreed upon by the supply and demand parties to the center of the sample to make it 10mm in diameter, then cover the test solution surface with a watch glass, and let it stand for 16 hours under the conditions of GB9278, remove the watch glass, immediately wash its surface with running water, and then continue to wash the sample with methanol or ethanol, wipe it with clean gauze and place it indoors for 1 hour, and observe the degree of pollution change of the paint film with the naked eye under scattered sunlight.
Appendix C
Solvent soluble composition test
(Supplement)
C1 Nitrocellulose content
Take about 20mL of the sample and place it in a 300mL conical flask, and add the mixed solvent (n-butanol: xylene = 1:4) while shaking the flask, with the total amount not exceeding 160mL. If the contents can be evenly dispersed, it can be considered that "cellulose nitrate does not exist". 7
W.C2 Phthalic anhydride content
C2.1 Reagents and solutions
HG/T2594-94
Benzene (GB/T690) Add anhydrous sodium sulfate to benzene and shake vigorously; Anhydrous ethanol (GB/T678) Add calcium chloride to anhydrous ethanol and shake to dehydrate. In the case of moisture absorption, it should be distilled before use; Calcium hydroxide (GB/T2306);
Ether (GB/T12591) Add Anhydrous sodium sulfate is shaken and dehydrated. If it absorbs moisture, it should be distilled for use; calcium oxide (GB/T1262);
calcium chloride (HG/T3208);
anhydrous sodium sulfate (GB/T9853);
0.5mol/L potassium hydroxide-ethanol solution (add a small amount of water and dehydrated ethanol to 1L for 35g potassium hydroxide), cover and shake to prevent carbon dioxide from entering.
Stand for 24h and take the upper clear liquid. C2.2 Filter
No. 3 glass sand core filter, filter pore 15~40um. C2.3 Sample treatment
Accurately weigh 10g sample (accurate to 0.002g) and add about 20mL solvent to a centrifuge tube, mix with a glass rod, and use solvent to wash the solid matter adhering to the glass rod into the centrifuge tube as much as possible. The total amount of solvent added is 40mL. Close the lid of the centrifuge test tube, place it in a centrifuge to separate the solid, pour out the supernatant, repeat the above operation three times, each time using 30mL of solvent. Place the collected clear liquid in a 300mL conical flask, heat it in a water bath to evaporate the solvent, and calculate the non-volatile content in the sample according to GB/T6740. C2.4 Quantitative analysis
Accurately weigh about 7g (accurate to 0.002g) of the sample obtained in C2.3, place it in a 300mL conical flask, add 10mL of benzene, install a reflux condenser with a calcium chloride ball to dissolve it, then add 150mL of 0.5mol/L potassium hydroxide-ethanol solution, cover it and keep it at about 55℃ for 18h, or keep it in the 60℃ water bath with the condenser installed for 1h, then slowly heat and boil for 3h, let it stand for 1h, and wash the inner wall of the conical flask with 50mL of ether. Pour the precipitate and solution in the conical flask into the weighed glass filter, and wash the precipitate 5 times with 10mL of a mixture of equal volumes of ether and ethanol each time. During this operation, if the precipitate absorbs moisture from the air and may dissolve, be careful not to let air pass through the precipitate.
Dry the glass filter at about 60℃ for 20min, then dry it at 130-150℃ to constant weight, take it out and place it in a desiccator to cool it, then weigh it to find the amount of precipitate. If the precipitate is not white, wash it 4 times with 20mL of water at about 80℃, and dry this washing solution at 105-110℃, and weigh the residue as water-insoluble matter. C2.5 Calculation of phthalic anhydride (%) in solvent soluble matter is calculated according to formula (C1): Xi (%) = m2X0.611
Wherein: m1——mass of sample, g;
m2——mass of precipitate, 8;
A—non-volatile matter of a sample, %
0.611——mass of phthalic anhydride equivalent to 1g potassium phthalate, 8. X100
If the precipitate is not white, it is washed with water and the corrected value of phthalic anhydride is calculated using formula (C2). (m2—B)×0.611
ml·A-BX100×100
X2(%)=
Wherein: m1——mass of sample, g
m2——mass of precipitate, g;
A——non-volatile matter of sample, %
(C2）
W.bzsoso:comB—mass of residue after washing with water, g
HG/T2594—94
0.611——mass of phthalic anhydride equivalent to 1g of potassium phthalate, g. C3 Nitrogen content
C3.1 Reagents and solutions
Potassium sulfate (HG/T3-920);
Copper sulfate (GB/T665);
Sulfuric acid (GB/T625);
0.05mol/L sulfuric acid solution;
Methyl blue-methyl red mixed solution;
Sodium hydroxide (GB/T629);
Standard sodium hydroxide titration solution: c(NaOH)=0.1mol/L, prepared and calibrated according to GB/T601; micro Kjeldahl nitrogen determination device.
C3.2 Test method
C3.2.1 Preparation of paint base concentrate
Weigh 30g of sample and place it in a 200mL beaker, add 100mL of diluent and mix well. Transfer the mixture into a centrifuge tube and place it on a centrifuge for separation. Take out the upper clear liquid and put it into 100mL evaporator III, and heat it in a water bath until almost no solvent remains. Stir the viscous resinous substance left in the blood with a glass rod, and accurately weigh 1g (accurate to 0.002g) as the paint base concentrate. According to GB/T6740, calculate the non-volatile content of the paint base concentrate used as a sample. C3.2.2 Decomposition of solvent soluble matter
Accurately weigh the paint base concentrate on nitrogen-free paper or filter paper to make it contain about 25mg of nitrogen, and heat it at 105-110℃ for about 3h. Put it into a Kjeldahl flask together with the paper or filter paper. Add about 5g of potassium sulfate and copper sulfate (anhydrous) powder mixed in a mass ratio of 10:1 into the Kjeldahl flask, and then add 20mL of sulfuric acid.
Put the Kjeldahl flask on the asbestos wire mesh, heat it slowly at first, and then gradually increase it to a level that can maintain the sulfuric acid vapor condensing at the neck of the flask. Stop heating when the solution turns transparent blue and no carbide is visible on the inner wall of the flask. After cooling, carefully add about 150 mL of water and cool to room temperature.
C3.2.3 Steaming stuffing
Add 23 zeolites to the Kjeldahl flask and accurately add 30 mL of 0.0.5mol/L sulfuric acid solution, add 5 drops of methyl blue-methyl red mixed solution as an indicator. Immerse the entire end of the backflow stopper in sulfuric acid. Add about 80mL of 33% sodium hydroxide solution from the injection tube, then wash it in with 10mL of water, immediately close the rubber tube with a screw clamp, start slowly heating the Kjeldahl flask, and then gradually boil the contents with strong heat for distillation. When 80-100mL is distilled out, lift the end of the backflow stopper out of the liquid surface, stop heating, wash the inner and outer walls of the backflow stopper with a small amount of water, and wash it into a conical flask. C3.2.4 Titration
Take out the conical flask and titrate with 0.1mol/L sodium hydroxide solution. The end point is when the solution changes from purple to colorless and then to green. Perform a blank test in the same way.
C3.2.5 Calculation
Nitrogen (%) in the solvent soluble matter is calculated according to formula (C3): x(%)=-V)XX0.001 4×1..
Wherein: X——Nitrogen in solvent soluble matter, %; V——Amount of sodium hydroxide standard titration solution used in blank test, mL; V2
W.bzsoso.cOIHG/T2594-94
c——Actual concentration of sodium hydroxide standard titration solution, mol/0.0014——Mass of nitrogen expressed in grams equivalent to 1.00mL sodium hydroxide standard titration solution [c(Na0H)=1.000mol/LJ,
S——Mass of paint base concentrate taken as sample, gD
——Non-volatile matter content in paint base concentrate, %Additional remarks:
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 is drafted by Shenyang Paint Factory and the Paint Industry Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Yu Tonglan, Fei Jinhao, Zhao Shengzhen and Xu Yaqin. This standard is equivalent to the Japanese Industrial Standard JIS K5652-83 "Nitrogen-based alkyd resin enamel".
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