Some standard content:
Chemical Industry Standard of the People's Republic of China
Powder coatings for refrigerators
Subject content and scope of application
HG/T2006-91
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, storage and transportation requirements of powder coatings for refrigerators. This standard applies to thermosetting epoxy-polyester powder coatings based on epoxy resin and polyester resin. The coating is suitable for coating the freezer door, refrigerator door and cabinet of refrigerators. 2 Reference standards
GB1727
GB1728
GB1729
GB1740
GB1764
GB1765
GB6739
GB9274
GB9750
GB9753
GB9754
3 Technical requirements
General preparation method of paint film
Determination of drying time of paint film and putty film
Determination of paint film color and appearance
Determination of moisture and heat resistance of paint film
Determination of paint film thickness
Determination of moisture resistance Preparation method of paint film with high resistance to corrosion, salt spray and weathering (artificial acceleration) Determination of salt spray resistance of paint film
Medical rubber
Sampling of coating products
Specification of water for laboratory
Determination of coating film hardness by pencil
Standard test plate for paints and varnishes
Determination of resistance of paints and varnishes to liquid media
Temperature and humidity for condition adjustment and testing of coating samples Scratch test for paints and varnishes
Cross-cut test for paint and varnish films
Paint product packaging marking
Cupping test for paints and varnishes
Determination of specular gloss at 20, 60° and 85° for paints and varnishes without metallic pigments The products shall meet the technical requirements listed in Table 1: Approved by the Ministry of Chemical Industry of the People's Republic of China on 1991-0S-27 and implemented on 1992-02-01
Sieve residue (125μm)
Color and appearance of film
Curing temperature, C
Curing time, min
Hardness,
Selection, unit value
Adhesion, grade
Cupping, mm
Scratch resistance, 8
Acid resistance (3%HCI, 240h)
Alkali resistance (5%NaOH, 168h)
Salt spray resistance (400h), grade
Moisture and heat resistance (1000h), level
4 Test method
4.1 Preparation of test sample
4.1.1 Selection of materials and surface treatment of test sample HG/T2006-91
All passed
The paint film is flat, slight orange peel is allowed, and the color meets the color difference range of 180±2
Not less than
Not less than
Not greater than
Not less than
Not less than
Not greater than
No change in the film
No change in the film
Use the steel plate specified in GB1727, and then carry out phosphating process after rust removal and degreasing. In this standard, except for the steel plates used for acid resistance, resistance, salt spray resistance, moisture and heat resistance and cupping test, the rest of the tests use tinplate plates. 4.1.2 Paint film preparation
Place the blank sample in the powder spray cabinet and work in the normal working order of the spray gun, high-voltage electrostatic generator powder spray cabinet powder beam recovery device, air compressor and other equipment. The sprayed sample should be kept vertical and placed in a constant temperature box with blast for reverse drying. The temperature is controlled at 180±2℃ for 15min. The coating thickness is 70~90μm. After 24h at room temperature, the performance test is carried out according to the relevant methods. 4.2 General conditions of the test
4.2.1 Sampling
Perform according to GB3186.
4.2.2 Standard test plate
Perform according to GB9271.
4.2.3 Plate making method
Perform according to GB1727.
4.2.4 State adjustment and test environment
Perform according to GB9278.
4.2.5 Determination of paint film thickness
Perform according to GB1764.
4.3 Determination of sieve residuewwW.bzxz.Net
Weigh about 100g (accurate to 0.2g) of sample, put the sample into a 125μm (120 mesh) test sieve with a chassis, cover the sieve cover, add weight to the electric motor and run for 30 minutes. After stopping for 10 minutes, remove the sieve from the motor, carefully open the cover, and observe with the naked eye. The sample should all pass through the test sieve, and no sieve residue is allowed. 16
4.4 Paint film color and appearance
Perform according to GB1729 Method A.
HG/T2006-91
4.5 Determination of curing temperature and curing time
The prepared sample is baked at 180±2℃, and the curing time is calculated according to the actual value in GB1728 (determination by method A). 4.6 Hardness
According to GB6739.
4.7 Gloss
According to GB9754, test at an angle of 60°. 4.8 Adhesion
According to GB9286, the tape should comply with GB2771. 4.9 Cupping
According to GB9753.
4.10 Scratch resistance
According to GB9279.
4.11 Acid resistance
Prepare 3%
4.12 Alkali resistance
HCI solution and test according to GB9274. Prepare 5% NaOH solution and test according to GB9274. 4.13 Salt spray resistance
Make plates according to GB1765, test according to GB1771, and evaluate according to GB1740. 4.14 Moisture and heat resistance
Make plates according to GB1765, test and evaluate according to GB1740. 5 Inspection rules
5.1 All technical requirements listed in this standard are type inspection items. Among them, the nine items of sieve residue, paint film color and appearance, curing temperature, curing time, hardness, gloss, adhesion, cupping and scratch resistance are listed as factory inspection items. When the belt is in production, a type inspection is carried out once a year.
5.2 The product shall be inspected by the inspection department of the manufacturer in accordance with the provisions of this standard, and the manufacturer shall ensure that all products leaving the factory meet the technical requirements of this standard. The product shall have a certificate of conformity, and instructions for use and precautions shall be attached if necessary. 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 the product.
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 The supply and demand parties 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 relevant departments shall be notified in time for handling. 5.6 When there is a dispute between the supply and demand parties over product quality, the product quality supervision and inspection agency shall perform arbitration inspection. 6 Marking
According to GB9750.
7 Packaging, storage and transportation
7.1 The product should be stored in a clean, dry and sealed container. When the product is stored, it should be kept ventilated and dry, and prevented from direct sunlight. It should be isolated from fire and heat sources. When the temperature is too high in summer, it should be cooled down. 7.2 When the product is transported, it should be protected from rain and sunlight, and should comply with relevant regulations. 7.3 Under the storage and transportation conditions of 7.1 and 7.2, the effective storage period of the product is one year from the date of production. If the storage period exceeds the storage period, it can be inspected according to the items specified in this standard. If the results meet the requirements, it can still be used. 8 Safety, hygiene and protection
8.1 Powder coatings are irritating to the eyes, skin and respiratory organs when they are in direct contact with people for a long time, and they are harmful to health if ingested. Therefore, people working in dusty environments should wear appropriate masks and protective clothing. 8.2 Exceeding the dust limit (55-58 mg/m2) may form dust clusters, which are easily ignited by open flames or electric sparks. Therefore, smoking is strictly prohibited in the operation site and open flames are not allowed.
HG/T2006-91
Appendix A
Construction reference
(reference)
Powder coatings should be used strictly in batch order, and the first produced ones should be used first. The surface pollutants of the workpiece should be thoroughly removed before spraying, and the pretreatment should be carried out correctly. The compressed air should be oil-free and water-free, and the working condition of the oil-water separator should be checked frequently. The workpiece should be clamped properly and maintained in good connection with the grounding transmission part. The fixture should be cleaned regularly to ensure good grounding. The performance of the oven should be stable. In order to reduce color difference, the overflow difference of the internal temperature of the oven should not be greater than 5°C to achieve the conditions for correct curing of the coating.
The powder feeder, recovery system and spray cabinet should be free of pollution and should not be mixed with other powders. Otherwise, the appearance of the final coating will be affected. A6
Frequently check the performance of the pretreatment and curing furnaces, and check the physical properties of the powder used. Recycled powder must be sieved and mixed with new powder in the specified proportion. Dust and other objects should be avoided near the powder coating spraying site to avoid affecting the appearance quality of the coating. Additional remarks:
This standard was proposed by the Science and Technology 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. The main drafter of this standard is Lu Xiumin.
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