Some standard content:
Chemical Industry Standard of the People's Republic of China
HG2277-92
Various Colors of Nitrocellulose External Magnets
Published on June 1, 1992
Ministry of Chemical Industry of the People's Republic of China
Implemented on March 1, 1993
W Chemical Industry Standard of the People's Republic of China
Various Colors of Nitrocellulose External Magnets
Subject Content and Scope of Application
HG/T2277-92
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, storage and transportation of various colors of nitrocellulose external magnets. This standard applies to various colors of nitrocellulose external magnets prepared from nitrocellulose, alkyd resin (or adding appropriate amount of other synthetic resins), various pigments, plasticizers and organic solvents. This paint is mainly used for the protection and decoration of metal surfaces such as machine tools, machines, equipment and tools. 2 Reference standards
GB1725
GB1726
GB1728
GB1762
GB1922
GB3186
GB5208
GB6682
Determination of solid content of coatings
Determination of hiding power of coatings
Determination of drying time of paint film and putty film
Determination of tackiness of paint film
Solvent oil
Sampling of coating products
Determination of flash point of coatings
Specification of water for laboratory
GB 9274
GB9278
GB9750
GB9754
GB9761
3 Technical requirements
Quick balance method
Determination of grinding fineness of coatings
Determination of resistance of paints and varnishes to liquid media
Temperature and humidity for condition adjustment and testing of coating samples Packaging marking of coating products
Paints and varnishes
Determination of specular gloss at 20°, 60° and 85° of paint films Paints without metallic pigments
Paints and varnishes Daylight colorimetry of paints
The products should meet the technical requirements in the following table.
State in container
Fineness, um
Workability
Drying time, min
Color and appearance of paint film
Approved by the Ministry of Chemical Industry of the People's Republic of China on 1992-06-01Not more than
Not more than
Superior product
First-class product
Qualified product
No lumps after stirring, in a uniform state||tt ||No obstacles in spraying two coats
Conforms to the standard sample and its color difference range, the paint film is flat and smooth. 1993-03-01 implementation
W.bzsoso.cOm hiding power (based on dry film), g/m
Dark complex color
Light complex color, green
White, pure blue
Gloss (60°)
Back adhesion, grade
Color penetration (except white and red)
Paint Membrane heating test (heating at 100~105℃ for 2h) Water resistance (immersed in GB6682 grade tertiary distilled water), h Volatile solvent resistance
Immersed in (GB1922) No. 90 solvent oil toluene = 9:1 mixed solvent for 2h
Immersed in (GB1922) No. 90 solvent oil for 2h
Solid content, %
Red, black, dark blue, purple, aluminum white and other colors
Solvent soluble Nitro
Flash point, ℃
HG/T2277-92
Not more than
Not more than
Not more than
Not more than
Not more than
Not more than
Not more than
Not less than
Not less than
Note: After adding aluminum powder paste to aluminum paint, the fineness and gloss are not tested. 4 Test methodWww.bzxZ.net
Superior product
No color penetration
Slight change is allowed
Qualified product
Allow the paint film to be slightly white, lose gloss, bubble, and recover within 2 hours without abnormality
Presence of nitro
The "specified conditions" referred to in the following test methods are the temperature and humidity specified in GB9278. 4.1 State in the container
Open the container first. If there is a crust, remove it. Stir the contents with a stirring spoon. Although there is some sediment at the bottom of the container, there is no particularly hard block. Scraping the bottom of the container can stir the sediment. When the contents are easy to mix evenly after stirring, it is considered "no hard block after stirring, in a uniform state".
4.2 Fineness
Perform according to GB6753.1.
4.3 Construction
Two pieces of tinplate plates 70mm×150mm×（0.2~0.3）mm. Dilute the paint with the specified diluent until the outflow time is 20~25s (Tu-4 viscometer), and spray the sample onto the test plate at a pressure of 0.2~0.4MPa.
W.bzsoso：comHG/T2277—92
If there is no particular difficulty in the first spraying operation, it can be regarded as "no obstacle in spraying one coat". Leave it for 1 hour under the specified conditions and spray the third coat.
If there is no particular difficulty in the second spraying operation, it can be regarded as "no obstacle in spraying two coats". 4.4 Drying time
According to GB1728 (surface drying method A, actual drying method B). 4.5 Paint film color and appearance
According to GB9761.
4.6 Hiding power
According to GB1726 method B.
4.7 Gloss
According to GB9754.
4.8 Adhesion
According to GB1762.
4.9 Color penetration
Two glass plates of 90mm×120mm×(2~3)mm. Spray the paint sample on the glass plate, spray two times, with an interval of 30min between each time, leave it under specified conditions for 24h after spraying the second coat, spray another coat of the same type of white nitro exterior enamel, and leave it under specified conditions for 30min. Visually check whether part of the paint film is dissolved under scattered sunlight, and observe the discoloration caused by the white paint film. If the white paint film of the test plate does not show discoloration caused by color penetration, it is considered as "no color penetration".
4.10 Paint film heating test
Two glass plates of 90mm×120mm×(2~3)mm. Spray the paint sample on the glass plate, spray two times, each time interval of 30min, dry film thickness of 30 ~ 40μm, after spraying the second coat, place it under the specified conditions for 24h, bake it in a 100 ~ 105℃ oven for 2h, take it out and place it under the specified conditions for 1h, if there are no bubbles, bubbling, cracks, peeling, and the color and gloss have slight changes, it can be regarded as "slight changes". 4.11 Water resistance
According to the provisions of GB9274 Chapter 5 Test Procedure
4.12 Volatile Solvent Resistance
Method A Immersion Method 5.4 Procedure A. Four steel plates 50mm×120mm×(0.45~0.55)mm. Spray the paint sample on the steel plate, spray two times, each time interval is 30 minutes, after spraying the second time, place it under the specified conditions for 1 hour, seal the edges with the original paint, dry it at 80 ± 2℃ for 30 minutes, take it out and place it for 1 hour, immerse it in a mixed solvent of (GB1922) No. 90 solvent oil: toluene = 9:1 or (GB1922) No. 90 solvent oil for 2 hours (dry paint film thickness 30 ~ 40μm), take it out and place it under the specified conditions for 2 hours. Keep one of the four sample plates, and test three. During the test, each sample plate is immersed in a beaker, and each beaker is filled with a mixed solvent or solvent, with a depth of about 150mm, and the test plate is immersed in a depth of 120mm. During the inspection, the paint film around the test plate and within a width of about 10mm from the liquid surface is not inspected. If wrinkles, bubbling, cracks, peeling, little change in color and gloss are seen on two of the three test panels, and the coloring and turbidity of the mixed solvent or solvent are not large, it can be regarded as "no abnormality". 4.13 Solid content
Follow the provisions of Method A of GB1725.
4.14 Nitro groups in solvent-soluble substances
Add about 5g of enamel and about 10mL of acetone to a centrifuge tube, mix thoroughly with a glass rod, use the acetone in the centrifuge tube to wash as much solid matter adhering to the glass rod as possible into the centrifuge tube, add acetone again to make the liquid reach 30mL, cover the centrifuge tube with a stopper, put it into a centrifuge to centrifuge and precipitate the solid matter, take out the upper clear liquid, add it to an evaporator, heat it on a water bath, and after most of the solvent is evaporated, put it in a 105-110℃ oven to dry for 1h, cut a small amount of solid matter and put it on a drip plate, add 1 drop of identification nitric acid reagent, and observe the color immediately. If the color is dark blue 3
W, it can be regarded as "nitro groups exist".
HG/T2277-92
Nitric acid reagent: Add 0.1g of diphenylamine to nitric acid (100+33) (V/V) to dissolve it. 5 Inspection rules
5.1 All technical items listed in this product are type inspection items. Except for the paint film heating test, nitro and flash point in solvent solubles, the other items are factory inspection items. Under normal production conditions, type inspection is carried out every six months. 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 indicators of this standard. The product shall have 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 the quality is found to be inconsistent with the technical requirements of this standard, the supplier and the buyer shall jointly re-sample and re-inspect according to GB3186. If it still does not meet the technical indicators of this standard, the product shall be judged as unqualified and the receiving department shall have the right to return the product.
5.4 The product shall be sampled in accordance with GB3186. The sample shall be divided into two parts, one for sealed storage for future reference and the other for inspection. 5.5 When there is a dispute between the supplier and the buyer over the quality of the product, the product quality supervision and inspection agency shall perform arbitration inspection. 5.6 Both the supplier and the buyer shall inspect and check the product packaging and quantity. If any leakage or discrepancy in the packaging is found, the relevant departments shall be notified in time.
6 Marking, packaging, purchase, storage and transportation
6.1 Products shall be stored in clean, dry and sealed containers. The labels of the containers shall be marked in accordance with GB9750. 6.2 Products shall be kept ventilated and dry during storage. They shall be protected from direct sunlight, fire and heat sources. In summer, they shall be cooled down.
6.3 Products shall be protected from rain and sunlight during transportation and shall comply with relevant regulations. 6.4 Products shall have an effective storage period of 1 year from the date of production under the storage conditions in accordance with Article 6.26.3. If the storage period exceeds the limit, they may be inspected according to the items specified in this standard. If they meet the technical requirements, they may still be used. 4
W.bzsoso.cOmHG/T2277—92
Appendix A
Construction reference
(reference)
A1 This paint is applied on the surface sprayed with primer, and has good bonding with the primer. It is advisable to use a primer that matches nitro paint. A2 The paint should be stirred evenly before use. If there are coarse particles or mechanical impurities, it must be filtered. A3 The construction is mainly sprayed, and X-1 nitro paint thinner is used. Construction in places with high humidity. If the paint film is found to be whitish, F-1 nitro paint moisture-proof agent or a mixed solvent of ethyl acetate and butanol (1:1) can be added appropriately to adjust. A4 During construction, the interval between two sprayings is preferably about 10 minutes. The amount of aluminum powder paint is best to be mixed according to demand. A5
Additional instructions:
This standard is 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 Beijing Red Lion Coatings Company and the Coatings Research Institute of the Ministry of Chemical Industry. The main drafters of this standard are Dai Leiyun, Fei Jinhao and Liu Jiyuan. From the date of implementation of this standard, the original professional standard ZBG51052-87 "Q04-2 Various Colors of Nitro-based External Enamel Paint" of the People's Republic of China will be invalid.
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