Preparation method of anti-yellowing waterborne polyurethane coating

A technology of water-based polyurethane and anti-yellowing technology, which is applied in the field of preparation of water-based coatings. It can solve the problems of high price, poor solvent resistance and abrasion resistance, and low mechanical strength of polyurethane, and achieve strong ultraviolet shielding effect, good hydrolysis resistance, Effect of improving tensile strength and mechanical strength

Inactive Publication Date: 2018-03-23
苏州炽蓝生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For water-based coatings that meet environmental protection requirements, aliphatic isocyanates are expensive, and the resulting polyurethane has low mechanical strength, poor solvent resistance and abrasion resistance

Method used

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  • Preparation method of anti-yellowing waterborne polyurethane coating
  • Preparation method of anti-yellowing waterborne polyurethane coating
  • Preparation method of anti-yellowing waterborne polyurethane coating

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A preparation method of anti-yellowing water-based polyurethane coating, wherein it is carried out according to the following steps:

[0029] 1) In the presence of a triethylenediamine catalyst, mix polytetrahydrofuran diol and polyisocyanate at a molar ratio of NCO / OH of 3:1, and react at 70° C. for 2 hours to obtain a polyurethane prepolymer; The amount of the catalyst is 0.2% of the total mass of polytetrahydrofuran diol and polyisocyanate;

[0030] 2), add 3% of the total weight of the polyurethane prepolymer hydrophilic chain extender and 12% of the total weight of the polyurethane prepolymer butanone solvent to the polyurethane prepolymer, react at 70°C for 2h, add triethylamine to The prepolymer was neutralized for 20 minutes, and water was added to emulsify to form a hydrophilic polytetrahydrofuran polyurethane for later use;

[0031] 3) Add 0.5% dispersant of ultrafine quartz powder solution mass concentration to the ultrafine quartz powder solution with a mas...

Embodiment 2

[0044] A preparation method of anti-yellowing water-based polyurethane coating, wherein it is carried out according to the following steps:

[0045] 1) In the presence of a triethylenediamine catalyst, mix polytetrahydrofuran diol and polyisocyanate at a molar ratio of NCO / OH of 5:1, and react at 70° C. for 23 hours to obtain a polyurethane prepolymer; The amount of the catalyst is 0.2% of the total mass of polytetrahydrofuran diol and polyisocyanate;

[0046] 2), add 5% of the total weight of the polyurethane prepolymer hydrophilic chain extender and 12% of the total weight of the polyurethane prepolymer butanone solvent to the polyurethane prepolymer, react at 70°C for 2h, add triethylamine The prepolymer was neutralized for 20 minutes, and water was added to emulsify to form a hydrophilic polytetrahydrofuran polyurethane for later use;

[0047]3) Add a dispersant with a mass concentration of 1% of the ultrafine quartz powder solution to the ultrafine quartz powder solution...

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Abstract

The invention relates to a preparation method of an anti-yellowing waterborne polyurethane coating. The preparation method comprises the following steps: (1) mixing and reacting polytetrahydrofuran glycol with polyisocyanates in the presence of a triethylenediamine catalyst to obtain a polyurethane prepolymer; (2) adding a hydrophilic chain-extending agent and a butanone solvent in the polyurethane prepolymer and reacting for 1-2 hours, adding triethylamine and carrying out neutral reaction on the prepolymer, adding water and emulsifying to form hydrophilic polytetrahydrofuran polyurethane forsubsequent use; (3) preparing ultra-fine quartz powder dispersion liquid; and (4) adding the ultra-fine quartz powder dispersion liquid in the polytetrahydrofuran polyurethane, and carrying out ultrasonic dispersion for 30-60 minutes under the condition that pH is 7 to obtain the anti-yellowing waterborne polyurethane coating. The prepared waterborne coating is used for forming a film, anti-yellowing property and mechanical property of the film are tested, then the yellowing grade can reach 3.5 level or above, the stretching strength is 50 Mpa or above, and the elongation at break is 800% orabove.

Description

technical field [0001] The invention relates to a method for preparing a water-based paint, in particular to a method for preparing a water-based paint with yellowing resistance under light conditions. Background technique [0002] Aromatic polyurethane coatings have the characteristics of high strength, good abrasion resistance and good solvent resistance. However, the existing aromatic polyurethane coatings tend to absorb moisture in the air during use, and under the action of ultraviolet light, accelerate the degradation and isomerization of polyurethane, making the aromatic polyurethane prone to yellowing. Therefore, factors affecting the yellowing of aromatic polyurethanes include moisture in the air, ozone and nitrogen oxides, in addition to solar ultraviolet light. [0003] To solve the yellowing problem, traditional coatings usually only add anti-ultraviolet additives or shielding agents to delay the yellowing time, but the yellowing resistance level is generally le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/08C09D7/61C09D7/63C08G18/10C08G18/48C08G18/66C08G18/32
CPCC09D175/08C08G18/10C08G18/4854C08G18/6688C08K3/36C08K5/101C08K5/175C08G18/3293
Inventor 邵亚陈伟
Owner 苏州炽蓝生物科技有限公司
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