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Varnish primer without whitening at high temperature and high humidity and preparation method thereof

A high-temperature, high-humidity, clear primer technology, applied in the field of coatings, can solve the problems of poor wetting and penetration, affecting the appearance of furniture, leaks, etc., and achieve high hardness, good leveling and fullness, and good wetting penetration. Effect

Inactive Publication Date: 2019-01-29
GUANGDONG MAYDOS BUILDING MATERIALS LTD CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The following problems exist in the coating process: (1) The primer has poor wettability and permeability to the holes of wood holes, and there are many fish eyes on the surface of the coating film. In severe cases, there are loopholes, which makes it difficult to polish, even if the wood is polished. There are also many white spots on the surface
(2) The moisture content of conventional wood is 10% to 17%, but in high temperature and high humidity (humidity greater than 90%), the wood will absorb water, and the moisture content will reach 20%. For some wood placed in the open air, the moisture content will even be as high as More than 25%, at this time, it is easy to turn white when using ordinary primer coating construction, and then the finished furniture after packaging is transported for a long distance. In high temperature and high humidity weather, it is easy to cause the late paint film of the furniture to fade, affecting the appearance of the furniture

Method used

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  • Varnish primer without whitening at high temperature and high humidity and preparation method thereof
  • Varnish primer without whitening at high temperature and high humidity and preparation method thereof
  • Varnish primer without whitening at high temperature and high humidity and preparation method thereof

Examples

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Effect test

preparation example Construction

[0045] 2, the preparation method of vegetable oil fatty acid alkyd resin

[0046] The preparation method of described vegetable oil fatty acid alkyd resin comprises the steps:

[0047] 1), take each raw material component by formula quantity;

[0048] 2) Put isooctanoic acid, castor oil, phthalic anhydride, pentaerythritol, trimethylolpropane, neopentyl glycol, antioxidant hypophosphorous acid and 5 kg of xylene into the reactor in sequence, and heat up to 150-160°C Keep warm for 1-1.5 hours, then rise to 220-225°C and keep warm until the test passes: viscosity 10000-20000mPa.s, solid content: 60-65% by weight, acid value: ≤15mgKOH / g, cool down to 160-170 It can be obtained by diluting butyl acetate with the remaining xylene at ℃.

Embodiment 1

[0051] 1. The formula and preparation method of the main agent of polyurethane varnish

[0052] formula

[0053] The formula of the polyurethane varnish main agent is as follows: 77 kilograms of vegetable oil fatty acid alkyd resin, 6 kilograms of ethyl acetate, 6 kilograms of propylene glycol methyl ether propionate, BYK163 high molecular weight block copolymer solution dispersant containing pigment affinity group 1.5 kg, BYK141 polysiloxane solution defoamer 0.2 kg, Disparon's 4200-10 polyethylene wax slurry anti-settling agent 2.5 kg, Guangxi Guiguang 1250 mesh talcum powder 2 kg, Sanyi SAK-ZS-PLB Zinc stearate 3.5 kg, BYK-333 polyether modified polydimethylsiloxane copolymer leveling agent 0.1 kg, ethylene glycol monobutyl ether 1 kg.

[0054] Preparation

[0055]The preparation method of described polyurethane varnish main agent comprises the steps:

[0056] 1), weigh each raw material component according to formula.

[0057] 2) Put the vegetable oil fatty acid a...

Embodiment 2

[0071] 1. The formula and preparation method of the main agent of polyurethane varnish

[0072] formula

[0073] The formula of the polyurethane varnish main agent is as follows: 75 kilograms of vegetable oil fatty acid alkyd resin, 4.5 kilograms of ethyl acetate, 5.5 kilograms of propylene glycol methyl ether propionate, BYK163 high molecular weight block copolymer solution dispersant containing pigment affinity group 2 kg, BYK141 polysiloxane solution defoamer 0.3 kg, 4200-10 polyethylene wax anti-settling agent 2 kg, 1250 mesh talcum powder 4.5 kg, Sanyi SAK-ZS-PLB zinc stearate 4 kg, BYK- 0.2 kg of 333 polyether modified polydimethylsiloxane copolymer leveling agent, 2 kg of ethylene glycol monobutyl ether.

[0074] Preparation

[0075] 1), weigh each raw material component according to formula.

[0076] 2) Put the vegetable oil fatty acid alkyd resin, ethyl acetate, and propylene glycol methyl ether propionate in the components into the dispersing tank, and disperse wi...

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Abstract

The invention discloses a varnish primer without whitening at high temperature and high humidity and a preparation method thereof. The varnish primer without whitening at high temperature and high humidity is composed of a polyurethane varnish main agent, a curing agent and a diluent, wherein the weight ratio of the polyurethane varnish main agent to the curing agent to the diluent is 1: (0.5-0.6): (0.5-0.9) during construction of the varnish primer. The varnish primer without whitening at high temperature and high humidity provided by the invention has characteristics like no returning to white, no matting, excellent pore permeability and good leveling degree and fullness for a coating film; and compared with a coating used in the conventional market, the varnish primer provided by the invention has the characteristics like no returning to white and no matting in a later stage for the coating film after construction in high-temperature and high-humidity weather, and has the advantagesof stronger substrate permeation wettability, lower odor, and no fish-eye defect for wood grains.

Description

technical field [0001] The invention relates to the technical field of coatings, in particular to a high-temperature, high-humidity non-whitening clear primer for surface coating of wooden products and a preparation method thereof. Background technique [0002] Most of the varnishes used for woodwork surface decoration now use ordinary primers and curing agents for production and coating. The following problems exist in the coating process: (1) The primer has poor wettability and permeability to the holes of wood holes, and there are many fish eyes on the surface of the coating film. In severe cases, there are loopholes, which makes it difficult to polish, even if the wood is polished. There are also many white spots left on the surface. (2) The moisture content of conventional wood is 10% to 17%, but in high temperature and high humidity (humidity greater than 90%), the wood will absorb water, and the moisture content will reach 20%. For some wood placed in the open air, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D7/61C09D7/20C08G63/49
CPCC08G63/48C09D7/20C09D7/61C09D175/14C08K3/34
Inventor 段成刚陈江平周伟建麦炜煜符英苑刘湘智
Owner GUANGDONG MAYDOS BUILDING MATERIALS LTD CO
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