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

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
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