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Waterborne polyurethane coating and preparation method thereof

A water-based polyurethane and coating technology, applied in the field of coatings, can solve the problems of hydrogen bond and van der Waals force damage, changes in physical and chemical properties, low water resistance, etc., to improve solvent resistance, increase elongation at break, and improve cohesive strength. Effect

Inactive Publication Date: 2021-01-05
上海顺多防水工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, water-based polyurethane has certain hydrophilic properties after film formation, so the water resistance is not high
Water-based polyurethane mainly relies on hydrogen bonds and van der Waals forces to bond with the substrate. Therefore, the adhesion is generally not ideal, especially in high-temperature environments or after soaking in water, hydrogen bonds and van der Waals forces will be destroyed, and the adhesion will further increase. affected
And due to the seriousness of environmental pollution, many ultraviolet rays can penetrate the atmosphere and irradiate polymer materials, which will change the physical and chemical properties of polymer materials, and then cause aging and loss of value. At present, the water resistance, adhesion and Anti-aging performance is a technical problem that needs to be solved

Method used

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  • Waterborne polyurethane coating and preparation method thereof
  • Waterborne polyurethane coating and preparation method thereof

Examples

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Effect test

Embodiment 1

[0046] A kind of water-based polyurethane paint, comprises A component and B component, and the mass ratio of A component and B component is 1:1;

[0047] The A component includes the following raw materials in parts by weight: 50 parts of water-based hydroxyacrylic acid emulsion, 4 parts of cosolvent, 0.3 part of defoamer, 0.5 part of ultraviolet light absorber, 10 parts of silica nanospheres, 5 parts of deionized Water, 1 part of modified montmorillonite and 0.5 part of composite antibacterial agent;

[0048] The B component includes the following raw materials in parts by weight: 7 parts of isocyanate curing agent and 3 parts of propylene glycol diacetate.

[0049] The preparation method of this aqueous polyurethane coating specifically comprises the steps:

[0050] The first step, add 60% deionized water, 20% co-solvent, defoamer, ultraviolet light absorber, silica nano-microspheres, modified montmorillonite and composite antibacterial agent into the stirring tank, at roo...

Embodiment 2

[0072] A kind of water-based polyurethane paint, comprises A component and B component, and the mass ratio of A component and B component is 1:1;

[0073] The A component includes the following raw materials in parts by weight: 55 parts of water-based hydroxyacrylic acid emulsion, 5 parts of cosolvent, 0.35 part of defoamer, 0.8 part of ultraviolet light absorber, 13 parts of silica nanospheres, 10 parts of deionized Water, 1.5 parts of modified montmorillonite and 0.8 part of composite antibacterial agent;

[0074] The B component includes the following raw materials in parts by weight: 10 parts of isocyanate curing agent and 5 parts of propylene glycol diacetate.

[0075] The preparation method of this aqueous polyurethane coating specifically comprises the steps:

[0076] The first step, add 60% deionized water, 20% co-solvent, defoamer, ultraviolet light absorber, silica nano-microspheres, modified montmorillonite and composite antibacterial agent into the stirring tank, ...

Embodiment 3

[0098] A kind of water-based polyurethane paint, comprises A component and B component, and the mass ratio of A component and B component is 1:1;

[0099] The A component includes the following raw materials in parts by weight: 60 parts of water-based hydroxyacrylic acid emulsion, 6 parts of cosolvent, 0.4 part of defoamer, 1 part of ultraviolet light absorber, 15 parts of silica nanospheres, 13 parts of deionized Water, 2 parts of modified montmorillonite and 1 part of compound antibacterial agent;

[0100] The B component includes the following raw materials in parts by weight: 14 parts of isocyanate curing agent and 6 parts of propylene glycol diacetate.

[0101] The preparation method of this aqueous polyurethane coating specifically comprises the steps:

[0102] The first step, add 60% deionized water, 20% co-solvent, defoamer, ultraviolet light absorber, silica nano-microspheres, modified montmorillonite and composite antibacterial agent into the stirring tank, at room ...

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Abstract

The invention discloses a waterborne polyurethane coating. The waterborne polyurethane coating comprises a component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight: 50-60 parts of water-based hydroxyl acrylic emulsion, 4-6 parts of a cosolvent, 0.3-0.4 part of a defoaming agent, 0.5-1 part of an ultraviolet absorber, 10-15 parts of silicon dioxide nano microspheres, 5-13 parts of deionized water, 1-2 parts of modified montmorillonite and 0.5-1 part of a composite antibacterial agent; and the component B comprises the following raw materials in parts by weight: 7-14 parts of an isocyanate curing agent and 3-6 parts of propylene glycol diacetate. The invention also discloses a preparation method of the waterborne polyurethane coating, and the waterborne polyurethane coating is high in water resistance and strong in adhesive force after being formed into a film by adding the ultraviolet absorber, the silicon dioxide nano microspheres and the modified montmorillonite; the coating is resistant to high temperature, good in mechanical performance, not prone to aging after being exposed to sunlight for a long time and long in service life.

Description

technical field [0001] The invention belongs to the technical field of coatings, and in particular relates to a water-based polyurethane coating and a preparation method thereof. Background technique [0002] Water-based polyurethane is a new type of polyurethane system that uses water instead of organic solvents as the dispersion medium, also known as water-dispersed polyurethane, water-based polyurethane or water-based polyurethane. Water-based polyurethane uses water as a solvent, has the advantages of no pollution, safety and reliability, excellent mechanical properties, good compatibility, and easy modification. The water-based polyurethane resin has gradually replaced the solvent-based and has become an important direction for the development of the polyurethane industry. Waterborne polyurethane can be widely used in coatings, adhesives, fabric coating and finishing agents, leather finishing agents, paper surface treatment agents and fiber surface treatment agents. ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D5/14C09D5/18C09D7/63C08G18/62
CPCC08G18/6229C08K2003/2296C08K2201/011C09D5/14C09D5/18C09D175/04C09D7/63C08K13/06C08K9/04C08K7/18C08K9/06C08K3/346C08K3/22C08K5/378C08K5/29
Inventor 赵书成
Owner 上海顺多防水工程有限公司
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