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Modified waterborne polyurethane resin used for wood lacquer and preparation method thereof

A water-based polyurethane and resin technology, used in polyurea/polyurethane coatings, coatings, etc., can solve the problems of poor water-based wood paint products, poor water resistance, gloss and alcohol resistance, and low hardness, and achieve chemical resistance. Excellent product performance, fast drying speed and high hardness

Active Publication Date: 2017-01-04
HEFEI KETIAN WATERBORNE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wood lacquer prepared by water-based polyurethane resin in the prior art has the problems of low hardness, poor water resistance, gloss and alcohol resistance, resulting in poor product quality of water-based wood lacquer

Method used

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  • Modified waterborne polyurethane resin used for wood lacquer and preparation method thereof
  • Modified waterborne polyurethane resin used for wood lacquer and preparation method thereof
  • Modified waterborne polyurethane resin used for wood lacquer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048]Add 30g polycarbonate diol, 12g polycaprolactone diol, 5g castor oil, 2g hydroxyl-terminated polysiloxane diol to the three-necked flask, then add 50g isophorone diisocyanate and heat up to 85°C , react for 2 hours, cool down to 50°C, add 6g dimethylolpropionic acid, 3g trimethylolpropane, 4g1,4-butanediol, 0.2g stannous octoate and acetone, stir, heat to 80°C, react 3h, cool down to 40°C, add 1g of γ-glycidyl etheroxypropyl trimethoxysilane, react for 10min, cool down to 10°C, add 4.5g of triethylamine to neutralize, add 230g of ice water to emulsify and disperse, then add 2.8g of ethyl alcohol chain extension after diamine, continued emulsification and dispersion, and then removed acetone by vacuum distillation to obtain modified water-based polyurethane resin emulsion.

Embodiment 2

[0050] In the there-necked flask, add 30g polycarbonate diol, 12g polycaprolactone diol, 5g castor oil, 3.5g hydroxyl-terminated polysiloxane diol, then add 50g isophorone diisocyanate and heat up to 85 ℃, react for 2 hours, cool down to 40℃, add 6g dimethylolpropionic acid, 3g trimethylolpropane, 4g1,4-butanediol, 0.2g stannous octoate and acetone, stir, then heat to 75℃, React for 4 hours, cool down to 40°C, add 1g of γ-glycidyl etheroxypropyl trimethoxysilane, react for 10min, cool down to 15°C, add 4.5g of triethylamine to neutralize, add 230g of ice water to emulsify and disperse, and add 2.8g Ethylenediamine is followed by chain extension, emulsification and dispersion are continued, and acetone is removed by vacuum distillation to obtain a modified water-based polyurethane resin emulsion.

Embodiment 3

[0052] Add 30g polycarbonate diol, 12g polycaprolactone diol, 5g castor oil, 2g hydroxyl-terminated polysiloxane diol to the three-necked flask, then add 50g isophorone diisocyanate and heat up to 90°C , react for 2 hours, cool down to 45°C, add 6g dimethylolpropionic acid, 3g trimethylolpropane, 4g1,4-butanediol, 0.2g stannous octoate and acetone, stir, heat to 80°C, react 3h, cool down to 40°C, add 2g of γ-glycidyl etheroxypropyl trimethoxysilane, react for 15min, cool down to 15°C, add 4.5g of triethylamine to neutralize, add 230g of ice water to emulsify and disperse, add 2.8g of ethyl alcohol at the same time chain extension after diamine, continued emulsification and dispersion, and then removed acetone by vacuum distillation to obtain modified water-based polyurethane resin emulsion.

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Abstract

The invention provides modified waterborne polyurethane resin used for wood lacquer and a preparation method thereof. The modified waterborne polyurethane resin comprises the following raw components in parts by weight: 35-65 parts of polyols, 30-55 parts of polyisocyanate, 2-6 parts of first small molecule chain extenders, 3-7 parts of an anionic hydrophilic chain extender, 1-3 parts of a cross-linking agent, 0.1-0.25 part of catalysts, 0.5-2.5 parts of a silane coupling agent, 2-5 parts of a salt-forming agent and 2-5 parts of second small molecule chain extenders, wherein the polyols comprise hydroxyl-terminated polysiloxane diol, castor oil and aliphatic polyester diol in a weight ratio of (2-5) to (4-8) to (30-50). A film of the obtained modified waterborne polyurethane resin has a high drying speed, has glossiness above 90 degrees, pencil hardness of 1-2H and such good water resistance that water drops are not abnormal on the film within 48 hours, and has the properties beyond the national standards.

Description

technical field [0001] The invention relates to the field of high molecular polymers, and specifically discloses a modified water-based polyurethane resin used for wood varnishes and a preparation method thereof. Background technique [0002] Wood varnish is an indispensable part of wood furniture, which can improve the rough feel of wood furniture and make furniture not affected by changes in climate and air humidity. However, in the current Chinese furniture industry, most of the wood coatings are still occupied by solvent-based wood coatings, and the VOC emitted by them seriously affects people's health. With the improvement of people's awareness of environmental protection, water-based wood lacquers are more and more recognized by the market due to their advantages of non-toxicity, low pollution, and environmental protection. [0003] At present, there are many studies on water-based acrylic resin, but its defects of hot stickiness, cold brittleness and poor oil resista...

Claims

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Application Information

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IPC IPC(8): C08G18/75C08G18/66C08G18/61C08G18/44C08G18/42C08G18/38C08G18/36C08G18/34C08G18/32C09D175/14
CPCC08G18/3206C08G18/348C08G18/36C08G18/3893C08G18/4277C08G18/44C08G18/61C08G18/6662C08G18/755C08G18/758C09D175/14
Inventor 赵学庭汪飞詹绍文李维虎戴家兵
Owner HEFEI KETIAN WATERBORNE TECH CO LTD