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Chemical Industry Standard of the People's Republic of China
HG/T2597—94
Epoxy-polyester powder coating
Published on March 17, 1994
Ministry of Chemical Industry of the People's Republic of China
Implemented on January 1, 1995
Chemical Industry Standard of the People's Republic of China
Epoxy-polyester powder coating
Subject content and scope of application
HG/T2597—94
This standard specifies the technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of epoxy-polyester powder coating. This standard applies to thermosetting light-resistant epoxy-polyester powder coatings made of epoxy resin and polyester resin as the main film-forming substances, and added with pigments, fillers, additives, etc.
Referenced standards
GB/T1727
GB/T1732
GB/T1740
GB/T1764
GB/T1771
General preparation method for paint film
Determination method for impact resistance of paint film
Determination method for moisture and heat resistance of paint film
Determination method for paint film thickness
Determination of neutral salt spray resistance of paint film
GB3186 Sampling of coating products
GB/T6739
Determination method for paint film hardness by pencil
GB/T6742
GB/T9274|| tt||Paint film bending test (cylindrical shaft)
Determination of resistance of paints and varnishes to liquid media
GB9278 Conditioning of coating specimens and temperature and humidity for testing GB/T9286
GB/T9750
GB/T9754
GB/T9761
3 Technical requirements
Scratch test of paint and varnish films
Paint product packaging marking
Paints and varnishes Determination of specular gloss at 20°, 60° and 85° of paint films without metallic pigments Visual colorimetry of paints
The products should meet the technical requirements listed in Table 1. Table 1
Sieve residue (125um), %
Coating film color and appearance
Gloss 60°
Adhesion (spacing 1mm), 6×6, grade
Bending test, mm
Not less than
Not less than
Not greater than
Not greater than
Approved by the Ministry of Chemical Industry of the People's Republic of China on March 9, 1994
0 or agreed
The coating is smooth, slight orange peel is allowed, and the color is in accordance with the specified color difference range 2H
Implemented on January 1, 1995
.bzsoso, cOn Impact resistance, cm
Resistance Acid (3% HC1), 240h
Alkali resistance (5% NaOH), 168h
Salt spray resistance, 400h, level
Moisture and heat resistance, 500h, level
4 Test method
4.1 Preparation of test specimens
4.1.1 Selection of materials and surface treatment of test specimens HG/T2597-94
Continued Table 1
Not less thanbzxZ.net
Not greater than
Not greater than
No change in paint film
Slight change is allowed and will recover within 2h
Use the steel plates specified in GB/T1727 and carry out phosphating process after rust and oil removal. In this standard, except for the steel plates used for acid resistance, alkali resistance, salt spray resistance, heat and humidity resistance and adhesion test, the rest of the tests are conducted with tinplate plates. 4.1.2 Preparation of paint film
Put the treated test plate in the powder spray cabinet, spray it with a spray gun and other equipment, and keep the sprayed sample vertically and put it into a constant temperature drying oven with blast for curing (temperature controlled at 180±2℃, time 15min, coating thickness 50～60um), then place it in a constant temperature room for 24h, and then perform performance test according to relevant methods. 4.2 General conditions of test
4.2.1 Sampling
Perform according to GB3186.
4.2.2 State adjustment and test environment
Perform according to GB9278.
4.2.3 Determination of paint film thickness
Perform according to GB/T1764.
4.3 Determination of sieve residue
Weigh about 100g (accurate to 0.2g) of the sample, put the sample into a 125um (120 mesh) or agreed test sieve with a chassis, cover the sieve cover, and vibrate on an electric vibrator for 10 minutes. After the vibration stops, remove the sieve from the motor, carefully open the cover, and observe visually. The sample should all pass through the test sieve, and no sieve residue is allowed. 4.4 Paint film color and appearance
Perform in accordance with GB/T9761.
4.5 Hardness
Perform in accordance with GB/T6739, and slight marks are allowed. 4.6 Gloss
Perform in accordance with GB/T9754.
4.7 Adhesion
Perform in accordance with GB/T9286.
4.8 Bending test
Perform according to GB/T6742.
4.9 Impact resistance
Perform according to GB/T1732.
4.10 Acid resistance
bzsoso, cOHG/T2597-94
Prepare 3% HCl solution and perform according to Method A of GB/T9274. 4.11 Alkali resistance
Prepare 5% NaOH solution and perform according to Method A of GB/T9274. 4.12 Salt spray resistance
Perform according to GB/T1771 and be evaluated according to GB/T1740. 4.13 Moisture and heat resistance
Perform according to GB/T1740.
5 Inspection rules
5.1 All technical requirements listed in this standard are type inspection items. Among them, the seven items of sieve residue, paint film color and appearance, hardness, gloss, adhesion, bending test, and impact resistance are factory inspection items, and each batch must be inspected. Type inspection is carried out once a year during normal production. 5.2 The product shall be inspected by the 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 technical requirements of this standard. The product shall be accompanied by a certificate of conformity and, if necessary, instructions for use and precautions. 5.3 The receiving department has the right to inspect the product in accordance with the provisions of this standard. If it is found that the quality does not meet the technical requirements of this standard, the supply and demand parties shall jointly re-sample and re-inspect in accordance with GB3186. If it still does not meet the technical requirements of this standard, the product is unqualified and the receiving department has the right to return it.
5.4 The product shall be sampled in accordance with the provisions of GB3186. The sample shall be divided into two parts, one for sealed storage for future reference, and the other for inspection. 5.5 Both the supplier and the buyer shall check and verify the product packaging, quantity and marking. If any leakage, quantity discrepancy, or marking not in compliance with regulations is found, the relevant departments shall be notified in time for handling. 5.6 When a dispute arises between the supplier and the buyer over product quality, the product quality supervision and inspection agency shall conduct arbitration inspection. 6 Marking
Perform in accordance with GB/T9750.
7 Packaging, purchase, storage and transportation
7.1 Products shall be stored in clean, dry and sealed containers. When storing products, they shall be kept ventilated and dry, and protected from direct sunlight. They shall be isolated from fire and heat sources. In summer, if the temperature is too high (over 35°C), efforts shall be made to cool them down. 7.2 Products shall be protected from rain and sunlight during transportation, and shall comply with relevant regulations. 7.3 Products shall have an effective storage period of half a year from the date of production under the storage and transportation conditions of 7.1 and 7.2. If the storage period is exceeded, they may be inspected according to the items specified in this standard. If the results meet the requirements, they may still be used. 8 Safety Precautions
8.1 Powder coatings are in direct contact with humans for a long time, and ingestion is harmful to health. Therefore, personnel working in a powder environment should wear appropriate masks and protective clothing.
8.2 The production and construction of powder coatings should comply with relevant national work safety regulations. 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 Wuxi Paint Factory and the Paint Research Institute of the Ministry of Chemical Industry. Huajia Chemical Co., Ltd., Sino-French Chemical Co., Ltd., Harbin Xinhui Paint Co., Ltd., Hebei Electrostatic Plastic Powder Factory, and Tianjin Lightheqi Chemical Co., Ltd. participated in the drafting. The main drafters of this standard are Wang Wenjie, Liu Jiyuan, Shen Fendi, and Fei Jinhao. 3
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