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Two-component polyurethane white primer and preparation method thereof

A two-component polyurethane, white primer technology, applied in the field of coatings, can solve the problems of large viscosity change, short service time, large fineness change, etc., and achieve the effect of slowing down the rising trend of viscosity

Pending Publication Date: 2021-07-16
四川嘉宝莉涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, after the hydrophilic modified polyisocyanate curing agent is mixed with the water-based hydroxyl resin, the first reaction is the -NCO group and water in the hydrophilic modified polyisocyanate curing agent, and the reaction will continue after the start , so the current water-based two-component polyurethane products have a common defect after the two components of the main paint and curing agent are mixed: the usable time is too short, mainly manifested in the large change in viscosity after the two components are mixed, generally within 2 hours The viscosity will double, and the fineness will change greatly
[0004] However, the current research on the pot life of water-based two-component polyurethane products after mixing the main paint component and curing agent component is mainly based on the change in the properties of the paint film after the final drying, basically not based on the change in the product state. as a basis for judgment

Method used

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  • Two-component polyurethane white primer and preparation method thereof
  • Two-component polyurethane white primer and preparation method thereof
  • Two-component polyurethane white primer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A two-component polyurethane white primer, comprising the following components in parts by mass:

[0028]

[0029] The preparation method of above-mentioned two-component polyurethane white primer comprises the steps:

[0030] S1. Add water-based hydroxyacrylic emulsion, defoamer, dispersant, titanium dioxide, calcium carbonate, talcum powder into the paint tank at a speed of 600rpm according to the above mass fraction, mix and stir, and then add film-forming aids Stir, finally add wetting agent and bactericide, and adjust the viscosity with thickener to 95s (at 25°C) with a T-4 viscosity cup, add pH regulator, stir well, and adjust to pH 7.6 , forming component A;

[0031] S2. Add the HDI isocyanate curing agent to the component A at a speed of 600 rpm according to the above mass fraction, and stir well.

Embodiment 2

[0033] A two-component polyurethane white primer, comprising the following components in parts by mass:

[0034]

[0035] The preparation method of above-mentioned two-component polyurethane white primer comprises the steps:

[0036] S1. Add water-based hydroxyacrylic emulsion, defoamer, dispersant, titanium dioxide, calcium carbonate, talcum powder into the paint tank at the speed of 800rpm according to the above mass fraction, mix and stir, and then add film-forming aids Stir, finally add wetting agent and bactericide, and adjust the viscosity with thickener to 98s (at 25°C) with a T-4 viscosity cup, add pH regulator, stir well, and adjust to pH 7.9 , forming component A;

[0037] S2. Add the HDI isocyanate curing agent to the component A at a speed of 800 rpm according to the above mass fraction, and stir well.

Embodiment 3

[0039] A two-component polyurethane white primer, comprising the following components in parts by mass:

[0040]

[0041] The preparation method of above-mentioned two-component polyurethane white primer comprises the steps:

[0042] S1. Add water-based hydroxyacrylic emulsion, defoamer, dispersant, titanium dioxide, calcium carbonate, talcum powder into the paint tank at the speed of 800rpm according to the above mass fraction, mix and stir, and then add film-forming aids Stir, and finally add wetting agent and bactericide, and adjust the viscosity with thickener to 97s (at 25°C) with a T-4 viscosity cup, add a pH regulator, stir well, and adjust to pH A value of 7.8 forms component A;

[0043] S2. Add the HDI isocyanate curing agent to the component A at a speed of 800 rpm according to the above mass fraction, and stir well.

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Abstract

The invention relates to a two-component polyurethane white primer, which comprises a component A and a component B. The component A comprises a water-based hydroxyl acrylic emulsion, a polyacrylic acid dispersant, titanium dioxide, a thickener and a pH regulator. The pH value of the component A is 7.6 to 7.9. The component B comprises an isocyanate curing agent. The component A comprises a water-based hydroxyl acrylic emulsion, a polyacrylic acid dispersant and a pH regulator, and the components have a synergistic effect, so that the relative stability of each performance of the two-component polyurethane white primer can be kept for a long time. The invention also discloses a preparation method of the two-component polyurethane white primer.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a two-component polyurethane white primer and a preparation method thereof. Background technique [0002] In the 1990s, Jacobs of Bayer Company developed isocyanates that could be emulsified in water. Since then, large-scale research on water-based two-component polyurethane coatings has begun. The film-forming of two-component water-based polyurethane coatings begins to dry physically, which is similar to single In the film-forming process of component water-based polyurethane, as the water volatilizes, the latex particles approach each other and squeeze each other to accumulate. When the -NCO group in the hydrophilic modified polyisocyanate curing agent and the OH group in the water-based hydroxyl resin Contact starts the chemical drying process, because there is a chemical reaction that will form an overall network structure in the form of chemical bonds, so the comprehensive performan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/04C09D5/00C09D7/63C09D7/65C08G18/73C08G18/62
CPCC09D175/04C09D5/002C09D7/63C09D7/65C08G18/73C08G18/6216C08L33/04C08K5/17
Inventor 朱雄屈玉山黄伟王捷陈永乐
Owner 四川嘉宝莉涂料有限公司
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