This standard specifies the typical process of polyurethane varnish finishing. This standard applies to the process specifications of polyurethane varnish finishing of wooden furniture and other wooden parts. QB/T 3657.1-1999 Wood furniture finishing process Polyurethane varnish finishing process specification QB/T3657.1-1999 Standard download decompression password: www.bzxz.net
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Light Industry Industry Standard of the People's Republic of China Wooden furniture finishing process Polyurethane varnish finishing process specification 1 Subject content and scope of application This standard specifies the typical process of polyurethane paint coating. This standard applies to the process specification of polyurethane varnish finishing of wooden furniture and other wooden parts. Reference standards GB/T4893.14893.8 Determination of paint film on furniture surface SG/T 279 Wooden furniture finishing 3 Finishing process flow QB/T 3657.1—1999 3.1 Polyurethane varnish finishing is divided into three levels: general, medium and high according to the material and process of the product. Three typical processes are commonly used: process A (see Table 1), process B (see Table 2), and process C (see Table 3). Table 1A type of process Process name Surface treatment Sand grinding Apply filler Primer coating Re-putty Dry sand grinding Water color Polyester primer Primer coating Adjust color difference Note: ①"0" in the table indicates the process to be performed; ②Oil-based putty should not be partially embedded; ③Water color should not be applied to the original wood color; Product level ①The coating should be dry for 36 hours before wet sanding; ③The side view area of intermediate products should reduce two topcoats. Approved by the Ministry of Light Industry of the People's Republic of China on October 23, 1989 Process name Sand grinding Apply topcoat Apply topcoat Wet sand grinding Apply topcoat Apply topcoat Wet sand grinding Polishing wax Product level Implemented on May 1, 1990 Process name White surface treatment Dry sand grinding Apply polyurethane color paste Apply polyurethane sealant Closed primer Re-fill putty Dry sanding Apply polyurethane closed primer Adjust color difference Dry sanding Apply polyurethane closed primer Note: ①\0\ in the table indicates the process to be performed; ②Oil-based putty should not be partially embedded, QB/T3657.1---1999 Table 2B process Product level ③The coating should be dried for 36 hours before wet sanding, ①For intermediate products, the side view area should reduce two topcoats; ③Dark colors should be applied on the white surface. Dry sanding Apply topcoat Apply topcoat Dry sanding Apply topcoat Apply topcoat Apply topcoat Wet sanding Finger polish Table 3C process White surface treatment Dry sanding Apply oily filler Apply phenolic diluted primer Re-fill putty Dry sanding Apply 15% shellac solution Adjust color difference Dry sanding Note: ① In the table, "0\ Indicates the process to be carried out; ② Oily putty should not be partially embedded; Product level ③ The coating should be dried for 36 hours before sanding, ① The side view of the intermediate product should reduce the topcoat twice, ③ The dark color should be painted on the white surface. 4 Material selection and preparation 4.1 Polyurethane varnish can be selected from Appendix A (reference). 224 Applying topcoat Applying topcoat Dry sanding Applying topcoat Applying topcoat Applying topcoat Applying topcoat Wet sanding Coating wax Ti KAoNi KAca- Product level Product level QB/T 3657.1-1999 4.2 Auxiliary materials such as dyes, pigments, curing agents, solvents, plasticizers, etc. shall not affect the performance specified by the polyurethane varnish. 4.3 The primer shall have good adhesion to the coated substrate and the topcoat, and shall not affect the physical and chemical performance requirements of the final paint film of the topcoat. 4.4 Preparation of pore filling materials: Generally, water-based pore filling materials, oily pore filling materials or polyurethane color paste pore filling materials can be used. Please refer to Appendix B (reference part) for the proportions and mix all components evenly. 4.5 Preparation of putty: Generally, shellac putty or oily putty can be used. Please refer to Appendix C (reference part) for the proportions and mix all components evenly. 5 Other requirements Surface of the coated product The moisture content of wood should be consistent with the annual average equilibrium moisture content of wood in the area of use. 5.1 Before painting, you must be familiar with the composition, performance, use and technical indicators of the paint and use it correctly according to the prescribed method. 5.3 Before painting, the oil stains, glue marks, resin, wood wool and other dirt on the surface of the painted object must be treated. 5.4 The painting site and painting tools must be kept clean, the condensation of the construction environment should be kept between 15 and 35°C, and the relative humidity should be below 75%. 5.5 The construction viscosity of the paint should meet the requirements of pouring, brushing and spraying. 5.6 During the paint preparation and construction process, the paint must not come into contact with water and alcohol substances. After the paint is mixed, it must be filtered through a 100~~120 mesh sieve, let it stand for 10~15min, and use it after the bubbles disappear. 5.7 5.8 The next coat of paint must be applied after the previous coat is dry, and the construction interval between the two coats should not be too long (not more than 24h). 6 Quality requirements for finishing layers 6.1 The physical and chemical properties of the paint film constructed in accordance with the provisions of this standard can reach the levels specified in Table 4. The test method should comply with the provisions of GB/T 4893.1~4893.8. Inspection items Liquid resistance of paint film Moisture and heat resistance of paint film Dry heat resistance of paint film Adhesion of paint film Gloss of paint film Difference of hot and cold overflow of paint film Abrasion resistance of paint film (Selected from GB/T4893.1~4893.8) 10% sodium carbonate, 24h 30% acetic acid, 24h 70℃, 15minbzxZ.net 80,15min (40±2)℃~(—20±2)℃ Relative humidity 98% ~99% 6 cycles High-grade: 4000 rpm, medium-grade: 2000 rpm, general-grade: 1000 rpm6.2 Appearance requirements of the finishing layer Appearance requirements of the finishing layer shall comply with the provisions of Article 3.2 of SG/T279-1985. Commercial The paint film surface shall be free of cracks, blistering, obvious loss and discoloration Recommended polyurethane varnish model QB/T 3657.1—1999 Appendix A Polyurethane varnish (reference) SO1-3, SO-5, SO1-11, SO1-15, SO1-17. Appendix B Pore-filling material ratio (reference) Water-based hole-filling material Calcium carbonate No. 200 solvent gasoline (or turpentine) Talc Polyurethane varnish Polyurethane diluent Calcium carbonate Calcium sulfate Shellac varnish (viscosity 11-12) Rosin water Oil-based hole-filling material Appendix C Putty ratio (reference) Shellac putty TiiKAoNniKAca ( (percentage by mass) Polyurethane color paste pore filling material (percentage by mass) Oil-based putty Talc Polyurethane varnish Polyurethane diluent Phenolic varnish Xylene No. 200 solvent gasoline (or turpentine) Additional instructions: QB/T3657.1--1999 Appendix D Polyurethane sealing primer, phenolic dilution primer ratio (reference) Polyurethane sealing primer This standard was drafted by Wuhan Furniture Factory. (percentage by mass) Phenolic dilution primer Tip: This standard content only shows part of the intercepted content of the complete standard. 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