Transparent solvent type low-construction VOC polyurethane composition for woodware surfaces and preparation method thereof

A solvent-based, polyurethane technology, applied in the field of solvent-based low-construction VOC polyurethane compositions and their preparation, can solve the problems of difficult film thickness extinction, easy cracking, dark bubbles, etc., and achieve the effects of good resistance, VOC reduction, and easy construction.

Inactive Publication Date: 2021-03-05
NIPPON PAINT CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ordinary high-solid, low-VOC coatings generally have multiple disadvantages and deficiencies, such as dark bubbles during construction, difficulty in matting due to film thickness, and easy cracking after drying.

Method used

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  • Transparent solvent type low-construction VOC polyurethane composition for woodware surfaces and preparation method thereof
  • Transparent solvent type low-construction VOC polyurethane composition for woodware surfaces and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A preparation method for a transparent solvent-based low-construction VOC polyurethane composition for wood surfaces, comprising the following steps:

[0059] a. Preparation of component A:

[0060] ⅰ, the preparation of prepolymer:

[0061] Weigh alkyd resin, slowly add dispersant at 600~800rpm, disperse and stir for 5~10min, then continue to add part of defoamer, stir and disperse, then slowly add matting powder, disperse at 1500~2500rpm for 10~20min, and use Clean the inner wall with some ketone solvents, and finally, under airtight conditions, stir evenly at a low speed in a 50°C constant temperature water bath for 24 hours to obtain a prepolymer;

[0062] ii. Preparation of Component A:

[0063] In the prepolymer, add polyester resin, reactive diluent, remaining defoamer, leveling agent, remaining ketone solvent, ester solvent, anti-sedimentation agent at 1000 rpm, and disperse evenly to obtain component A;

[0064] Component A described therein has a compositio...

Embodiment 2

[0106] A preparation method for a transparent solvent-based low-construction VOC polyurethane composition for wooden surfaces, comprising component A, component B and component C, wherein the weight ratio of component A, component B and component C is 100 :100:30;

[0107] Its preparation steps are:

[0108] a. Preparation of component A:

[0109] ⅰ, the preparation of prepolymer:

[0110] Stir 60 parts of Changxing ETERKYD 36093-B-80 resin at 600-800rpm, slowly add 0.5 parts of dispersant AFCONA-5051 to disperse and stir for 5-8 minutes, then add 0.2 parts of defoamer BYK-066N and continue to stir evenly; then slowly Add 20 parts of Grace MSK-D1 matting powder, disperse at 1500-2500 rpm for 10-20 minutes, and wash the inner wall with 1.5 parts of MAK solvent, and finally, under airtight conditions, stir evenly at a low speed in a 50°C constant temperature water bath for 24 hours to obtain a prepolymer;

[0111] ii. Preparation of Component A:

[0112] Add 7 parts of DSM U...

Embodiment 3

[0119] A preparation method for a transparent solvent-based low-construction VOC polyurethane composition for wooden surfaces, comprising component A, component B and component C, wherein the weight ratio of component A, component B and component C is 100 :100:30;

[0120] Its preparation steps are:

[0121] a. Preparation of component A:

[0122] ⅰ, the preparation of prepolymer:

[0123] Stir 60 parts of Changxing ETERKYD 3609-B-80 resin at 600-800rpm, slowly add 0.5 parts of dispersant AFCONA-5051 to disperse and stir for 5-8 minutes, then add 0.2 parts of defoamer BYK-066N and continue to stir evenly; then slowly Add 17 parts of Grace MSK-D1 matting powder and 3 parts of SYLOID ED5 matting powder, disperse at 1500-2500 rpm for 10-20 minutes, and clean the inner wall with 1.5 parts of MAK solvent, and finally, under airtight conditions, stir evenly at a low speed in a 50°C constant temperature water bath for 24 hours , to obtain the prepolymer;

[0124] ii. Preparation ...

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Abstract

The invention discloses a transparent solvent type low-construction VOC polyurethane composition for woodware surfaces and a preparation method thereof. Alkyd resin with high solid content and low viscosity, polyester resin containing hydroxyl and a special curing agent with high solid content are adopted, a special process is adopted under specific matching, and the polyurethane composition withlow viscosity is obtained. On the basis of not changing the construction and coating habits and conditions of the existing wood lacquer, the polyurethane composition disclosed by the invention is lessin coating times, so that the raw materials and the labor cost are further saved. In addition, the low VOC emission requirement (less than 420g / L) is achieved, and the purpose of tax exemption is achieved. A paint film obtained by using the polyurethane composition has the advantages of high transparency, high fullness, favorable hardness, favorable mechanical properties and excellent decorativeeffect. Aiming at the fact that no such commodity is sold and used in the market, the invention fills market vacancy.

Description

technical field [0001] The invention relates to the field of polymer coatings, in particular to a transparent solvent-based low-construction VOC polyurethane composition for wood surfaces and a preparation method thereof Background technique [0002] Wood varnish is a kind of coating applied on the surface of wood to protect and decorate the wood. At present, in the coating process of furniture wood, most of the wood coatings used are traditional solvent-based polyurethane coatings. This type of traditional solvent-based polyurethane coating is widely used because of its excellent paint film properties. However, this type of coating contains a large amount of organic solvents, and organic solvents are often used for dilution during construction. With the volatilization of organic solvents, it will not only cause harm to the health of construction and users, but also seriously pollute the environment, and even cause the destruction of the ecological system. [0003] With th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/14C09D7/42C09D7/20C08G18/68C08G18/42C08G18/10
CPCC09D175/14C09D7/42C09D7/20C08G18/68C08G18/42C08G18/10C08L2201/10C08L71/00C08L91/00
Inventor 金昌群高建东余华龙龙世喆熊绍泊
Owner NIPPON PAINT CHINA
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