Light Industry Department: (SG279-83).
In order to promote the improvement of the quality of wood furniture finishing throughout the country and to harmonize the quality standards of Xu Pei, the national wood furniture, the Ministry of Light Industry developed the standard for the finishing of wood furniture (SG279-83).
The basic content is now described as follows:
(1) Finishing grade
According to the different materials and processing technology of the product, the coating can be divided into three grades: general, medium, and high.
I The surface of the primary coating film is primary light (i.e., no sand, no polishing).
2. The surface of the intermediate front-view coating must be sanded, polished, or matte, and the side coating of the product is the original light.
3. The high-quality coating surface is fully polished or filled with matt finish.
(b) Finishing materials
1. General grade: The paints used in general grade products are phenolic, infusible, and ester glues with poor texture.
2. Intermediate: Middle-level products use the same high-end paint as the front-end product, and the side-view products are of the same general class.
3. Advanced: Advanced products use paints with polyurethane, polyester, acrylic, nitro, photosensitive, natural paints and other coatings with good properties.
(III) Technical Requirements
1. Surface treatment steps before coating
The finish of the first product should be cleaned of grease (pine oil, mineral oil), wax, salt, alkali, and other contaminants.
The surface of the product before the second coating should be smooth, smooth, free of planing, sand marks, lines, edges and corners and other parts should be intact.
The third advanced product should be covered with fur before painting.
2. Coating appearance requirements
Appearance requirements for different product coatings are listed in Table 51, Table 5-2, and Table 53, respectively. In addition to the bronze color pattern requirements,
The rest of the requirements are the same as those specified in Table 5-3. The matte hole matte coating has the same requirements as Table 5-2 and Table 5-3, except that the gloss requirements are different. The opaque coating has no obvious wood grain. The requirements are the same as those in Table 5-1, Table 5-2 and Table 5-3.
Project technical requirements
The color coating is basically uniform in color, allowing the wood grain to have a slight blur; the batch of matching products, the color is basically close to; the coloring part, when thick looking (distance of 1 meter), it is allowed to have inconspicuous sagging, colored flowers, excessive blemishes, and daylight. White spots and other defects.
The surface of the transparent finishing coating is smooth in feel, even in luster, and the wooden hole is allowed to sink after the coating is dry; the surface of the coating is allowed to have inconspicuous particles and slight unevenness and defects that do not affect the performance, but the coating film is not sticky and obvious. Sag, with bristles and other defects
Unpainted parts allow paints and stains that do not affect the appearance.
Project technical requirements
The color coating is brighter in color, similar to the sample plate, with clear wood grain; the color of the whole product or accessory product is similar; the color line at the color separation is neat; where there are no coloring sites, there should be no sagging, colored flower, overcast, white and white. Point, powder, miscellaneous slag and other defects; the color of the inner surface is close to the color of the outer surface, or may be determined according to the user's requirements.
The clear coating must be finished with a polished surface. The surface should be smooth and smooth. After the film is dried, there is no obvious wooden hole sinking. The surface of the side non-polished coating is smooth and smooth, with no obvious particles. Layer table; surface should be no sag, shrink holes, bubbling, bristles, wrinkled skin, missing coating, sticky and other defects. Allows slight bulging and unevenness
Face polishing │ Coating is flat, with a mirror-like luster; coating surface should have no apparent processing marks, thin lines, scratches, fog, white defects, white spots, blisters and other defects. clean
The color coating is bright and consistent with the sample, clear wood grain; uniform color of the whole product or accessory product; light color at the color separation must be neat and consistent; where there are coloring spots, there must be no visual defects, such as powder, color flowers, Defects such as blemishes, white spots, chromatic aberrations, etc.; internal coloring is similar to appearance color, or according to user's coloring requirements.
The surface of the clear coating is smooth and smooth. After the coating is dry, there must be no wood hole sinking; the surface of the coating must not have sagging and shrinkage holes. Swelling, bubbling, wrinkled skin, edges and corners are basically similar to the plane, and there are no defects such as paint abrasions.
The surface is fully polished and the coating is flat and has a mirror-like sheen; the surface of the coating must not have visible visible processing marks. Pinstripe. Scratches, fog, white, white spots, blisters and other defects.
Do not paint parts to keep the edges of the paint line neat
3. Paint sample replacement must be replaced on a regular basis.
4. The physical and chemical properties of the coating are specified in Table 5-4.
Project categories, indicators
Intermediate, advanced
Temperature resistance 85°C 15 minutes No discoloration, bubbling, no continuous loop or obvious discontinuity marks, slight light loss Allows for 15 minutes at 80°C No color change blisters, no continuous loops or visible discontinuities Circle mark, allowing slight light loss
80-hour water-resistant film without discoloration, blistering, allowing slight loss of light
Alkali-resistant 4 hours film no discoloration, bubbling, allowing slight loss of light 6 hours no discoloration, blistering, allowing slight light loss
Acid-free 2-hour film with no discoloration, blistering, allowing slight loss of light
Gloss over 80% 85% over 90%
Adhesion more than 80% does not fall off more than 90% does not fall off
The temperature difference between hot and cold 3 weeks The coating is free of cracks, blisters, and peeling. Allows slight color change. 6 weeks The coating film is free of cracks, blisters, peelings, and slight color changes are allowed
Abrasion resistance (weight: 1000g) 400 turns without exposure from 2000 revolutions without whitening 4000 revolutions without white
Note: 1 The physical and chemical properties of temperature resistance, water resistance, acid resistance, alkali resistance, wear resistance refers to the furniture surface requirements;
2 slight loss of light means that the gloss is reduced by 5 to 10% before the test;
(3) The temperature resistance of the nitrocellulose varnish can be reduced by 10 degrees compared with the table
Third, coating physical and chemical properties testing
The physical and chemical properties of the coating mainly depend on the properties of the coating, and it also has a certain relationship with the coating process.
For coatings of the same quality with the same quality, if the coating process (that is, coating quality) is different, the physical and chemical properties (such as adhesion, gloss, and liquid resistance) of the coating film will be different. Different kinds and quality of coatings, even if the same coating process, the physical and chemical properties of the coating will be a big difference. For example, the gloss of the unsaturated polyester coating film is better than that of the polyurethane coating, but the elasticity of the coating film is lower than that of the polyurethane coating. Therefore, the physical and chemical properties of the coating film are the comprehensive reaction between the coating performance and the coating process. . The physical and chemical properties of the coating should be reasonably determined according to the grade and purpose of the product to ensure scientific use of the product's functional requirements.
There are various physical and chemical properties of the coating. The current national standard GB4893.1 4893.885 “Measurement of paint film on the surface of furniture†stipulates that the coating film is resistant to liquid, hot and humid, resistant to dry heat, temperature difference, adhesion, thickness and luster. Degree of determination methods; coating film elasticity, hardness, transparency and other properties of the determination, paint manufacturing industry also has a corresponding detection method and testing standards.
(I) Coating film resistance test method
1. Table 6-1 shows the performance and specifications of the main liquids that the test liquid furniture is exposed to.
No. Liquid Name Performance and Specifications
1 15% aqueous sodium chloride solution (weight percent concentration)
2 Sodium carbonate aqueous solution 10% (concentration by weight)
3 Aqueous acetic acid 30% (concentration by weight)
4 Ethanol 70% Medical Ethanol
5 Detergent Solution White Cat Detergent (25% Fatty Alcohol Ethylene Oxide 75% Water)
6 Soy sauce meets SB70-78S Soy Sauce Quality Standard
7 blue black ink meets QB551 81 blue black ink)
8 Red ink is commercially available
9 iodine according to Chinese Pharmacopoeia
10 Toilet Water 70 75% Ethanol, 2-3% Flavor
11 Tea Yunnan Blush Red Tea with 1000g boiling water, do not stir, soak the tea after soaking for 5min
12 Coffee Water 40g Instant Coffee Add 1000g Boiling Water
13 Sweetened condensed milk QB34-60 "Sweet condensed milk"
14 Soybean Oil QB1225-79 "Soybean Oil"
15 distilled water laboratory distilled water
two. Test conditions: The sample size is 250 X 200mm, and the number is 4 pieces, among which 3 pieces are used for testing and 1 piece is used for comparison; the sample to be tested is stored for at least 10 days after the paint is finished, so that the coating film is completely dry, and the coating film is required to be completely undrawn. Defects such as marks, blisters, etc.; test chamber temperature 20°C, soil 2°C, relative humidity 60 to 70%; (The other physical and chemical properties of the coating film are the same as the detection conditions and will not be repeated later).
3. Test method Use a soft cloth or yarn to clean the surface of the sample (pieces). Take three test sites and one comparison site on the sample. Make the center point of the test site more than 40mm away from the edge of the test piece. The center distance should be greater than 65mm, filter paper (GB1915-80 qualitative filter paper) with a diameter of 25mm should be soaked in the test solution, remove with stainless steel tip tweezers, put five layers of filter paper on each test site, and use glass cover Live; in the detection process must always maintain the filter paper moist, if the test for a long time, the filter solution in the test solution volatile more wet, the available dropper on the filter paper to add the test solution to achieve the wet requirements; to achieve the specified time (detection time Generally, it is based on product quality standards or agreement between the supply and demand sides. After the recommended time is 10s, 10min, lh, 4h, 5h, 24h, 80h), remove the glass cover and test paper. Clean the residue with a clean filter paper and let it rest for 16 to 24 hours. Wash the surface of the sample with clean water and dry it with a soft cloth. Stand still for 30 minutes. Observe the difference between the test site and the control site: if there is discoloration or blistering. , wrinkles and other phenomena, and graded according to grading standards.
(B) coating film heat and humidity detection: is to use the standard ZH62 brass test cup (cup diameter of 50 soil 0.1, diameter 40 soil 0.1, cup height 105 soil 0.1, cup depth 102 soil 0. Lmm, cup bottom outer diameter 48 earth 0.1, inner diameter 40 earth 0.1, deep 0.5 earth 0.01mm) holds 100 grams of mineral oil with specified temperature (may be 80, 90, 100, 120, 150 °C) ( Burning point >250°C), standard neoprene wet cloth (white, item No. 21156, product name 112/62, 53g/m2, size 70 X 70mm) impregnated with distilled water on the next layer, placed on the sample film test area, The prescribed time (usually 15 minutes), and then take the test cup and wet cloth, dry with moisture filter paper, static 16 ~ 24 hours; observed at the test site of the degree of damage, and to be assessed.
(C) coating film resistance to dry heat detection: the use of the above-mentioned standard copper test cup containing 100 grams of mineral oil with a specified temperature (suggested respectively 70,80,90,100,120 °C) directly placed in the sample coating film testing , After a specified time (usually 15 minutes), take the test cup, use a filter paper to lightly detect the test site, indicate the test site temperature, static place 16 to 24 hours, and then use the filter paper lightly to detect the place, carefully observe the changes in the test The situation is evaluated according to the grading standard in Table 6-3.
Note: The test conditions and the method for assessing the final result are the same as the liquid resistance test.
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