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Polyurethane matt varnish

A polyurethane and polyurethane curing agent technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as low solid content in construction, difficulty in meeting environmental protection requirements with triphenyl content, poor transparency, etc., and increase matting performance , Good recoating transparency, improve the effect of recoating transparency

Inactive Publication Date: 2005-06-29
SHENZHEN FEIYANG JUNYAN TECH DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this type of varnish is that the paint film is fuller than the first type, and the yellowing resistance is better. The disadvantage is that the transparency after recoating is poor. If the content is too high, the paint film will be whitish and the transparency will be poor
The solid content of these two types of polyurethane matt varnishes is not high in construction, the plumpness is not good, and the VOC emission is too high. When using ordinary curing agents, the free TDI content is difficult to meet environmental protection requirements. The diluent is a conventional component. Three Benzene content is difficult to meet environmental protection requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation process of the polyurethane matte varnish of the present embodiment is as follows:

[0018] 1. Preparation of paint component (abbreviated as component A):

[0019] In a 500ml tin can, add 180g of modified saturated polyester resin (HS129), 45g of short oil soybean oil alkyd resin (1180D), 15g of castor oil, 30g of tough aldehyde and ketone resin (CF-60), and then add low molecular weight Unsaturated polycarboxylic acid polymer dispersant (BYK104) 1.2g, modified polysiloxane defoamer (5500) 0.9g, polyether modified polydimethylsiloxane leveling agent (BYK306) 0.6g, Polyacrylic acid copolymer leveling agent (BYK358) 1.5g, polyether siloxane leveling agent (10% Tego450) 1.8g, high boiling point solvent dimethyl mixed diacid (NME) 8.1g, plus matting powder (ED -30) 15g, polytetrafluoroethylene wax (FS421) 0.9g, the above materials are stirred at high speed to disperse and scrape the fineness ≤ 20um.

[0020] 2. Preparation of polyurethane curing agent com...

Embodiment 2

[0039]In component A of Example 1, the modified saturated polyester resin (HS129) was changed to 165g, the short oil soybean oil alkyd resin (1180D) was changed to 60g, castor oil was changed to 6g, and the aldehyde and ketone resin (CF- 60) is changed to 30g, matting powder (ED-30) is changed to 12g, polytetrafluoroethylene wax (FS-421) is changed to 1.5g, mixed diacid dicarboxylic acid (NME) is changed to 19.5g, and others remain unchanged. In component B of Example 1, the toluene diisocyanate trimer 50T was changed to 180 g, and the 80% toluene diisocyanate and 20% trimethylolpropane adduct (JK75) was changed to 120 g. When mixing paint, take 300g of component A, 150g of component B and 210g of component C (according to the weight ratio of A:B:C=1:0.5:0.7) and mix together to prepare a high-volume, high-definition, environmentally friendly polyurethane matte Varnish 660g. The NCO / OH=99.2% of the product of Example 2, the construction solid content is as high as 41.6%.

Embodiment 3

[0041] In component A of Example 1, the modified saturated polyester resin (HS129) was changed to 150g, the short oil soybean oil alkyd resin (1180D) was changed to 75g, castor oil was changed to 0, and the aldehyde and ketone resin (CF- 60) was changed to 36g, the matting powder (ED-30) was changed to 9g, the polytetrafluoroethylene wax (FA-421) was changed to 3g, and dimethyl mixed diacid NME was changed to 6g, and the others were unchanged. In component B, the toluene diisocyanate trimer (50T) was changed to 210g, and the 80% toluene diisocyanate and 20% trimethylolpropane adduct (JK75) was changed to 90g. When mixing paint, take 300g of component A, 150g of component B, and 180g of component C (according to the weight ratio of A:B:C=1:0.5:0.6) and mix together to prepare a high-volume, high-definition, environmentally friendly polyurethane matte Varnish 630g. The NCO / OH=94.4% of the product of Example 3, the construction solid content is as high as 42.8%.

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PUM

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Abstract

A kind of polyurethane matte varnish, is made up of lacquer component, polyurethane curing agent component and diluent component in weight ratio of 1:0.5:0.6-0.8, and polyurethane curing agent component contains 50-70% by weight of toluene diisocyanate Trimer, the rest is an adduct of 80% toluene diisocyanate and 20% trimethylolpropane, the paint component contains 15-25% by weight of 80% solid short oil soybean oil alkyd resin, 50- 60% modified saturated polyester resin, 0-5% castor oil, 10-12% aldehyde and ketone resin containing 60% solid, 3-5% matting powder, 0.3-1.0% polytetrafluoroethylene wax, 4%-10% of conventional additives and solvents, the diluent component contains 70-80% by weight of butyl acetate, 10-20% of dimethyl mixed diacid, and 10-15% of isophorone. The polyurethane matte varnish of the invention has the characteristics of high definition, plump paint film, improved hardness and scratch resistance, and good yellowing resistance.

Description

technical field [0001] The invention relates to a polyurethane matte varnish for wood coating. Background technique [0002] In the furniture industry, polyurethane matt varnishes have high volatile organic compound (VOC) emissions, high content of free TDI (toluene diisocyanate and triphenyl), insufficient plumpness during construction, and poor transparency during recoating. It is a difficult problem for many paint manufacturers to solve. At present, there are generally two types of polyurethane matt varnishes used in the wood market: the first type is to introduce a certain amount of nitrocellulose into the paint components, and basically not to introduce toluene diisocyanate trimer curing agent into the curing agent components. The advantage of this type of polyurethane matte varnish is that it has better transparency after recoating, but the disadvantage is that the paint film is not plump, the VOC emission is too high, and most of them have high triphenyl content and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04
Inventor 肖增钧黄必文
Owner SHENZHEN FEIYANG JUNYAN TECH DEV
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