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Polyurethane coating with high solid content and high weather resistance and preparation method thereof

A polyurethane coating, high solid content technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve problems such as poor curing performance, and achieve the effects of reduced system viscosity, smooth paint film, and good pot life

Active Publication Date: 2018-01-30
XIAMEN SUNRUI SHIP COATING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of poor curing performance of high solid polyurethane coatings prepared from polyester polyols at room temperature in the prior art mentioned above, the present invention provides a method of adding aspartic resin to polyester polyols to improve its performance. High solid content and high weather resistance polyurethane coating with curing performance, low VOC emissions, environmentally friendly and non-toxic, and on the premise of maintaining environmental protection and greenness, it enhances the curing performance of the coating at room temperature, and has excellent mechanical properties and weather resistance. Applicable to various environments such as atmospheric areas of ships and offshore platforms

Method used

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  • Polyurethane coating with high solid content and high weather resistance and preparation method thereof
  • Polyurethane coating with high solid content and high weather resistance and preparation method thereof
  • Polyurethane coating with high solid content and high weather resistance and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Preparation of component A: Put 27 parts of polyester polyol and 18 parts of aspartic resin in a container and stir evenly, wherein the proportion of aspartic resin is 7.2 parts of aspartic resin with a viscosity of 155 mPa·s at 25°C, 25 parts of aspartic resin 10.8 parts of aspartame resin with a viscosity of 300mPa·s at ℃, then add 1.5 parts of wetting and dispersing agent and 2 parts of UV absorber, disperse and mix for 20-40min at a speed of 1300-1700r / min, add 4 parts of pigment, filler After dispersing and mixing 45 parts at a speed of 2800r / min to 3200r / min for 55 to 65 minutes, add 2.5 parts of thixotropic agent and disperse and mix at a speed of 1300 to 1700r / min for 20 to 40 minutes to make the coating fineness below 40μm and then filter A component can be obtained;

[0045] Preparation of component B: uniformly blend 36 parts of curing agent and 0.5 part of catalyst in a container and then filter to obtain component B. The curing agent is two polyisocyanates ...

Embodiment 2

[0047]Preparation of component A: Put 28 parts of polyester polyol and 14 parts of aspartic resin in a container and stir evenly, wherein the proportion of aspartic resin is 8.4 parts of aspartic resin with a viscosity of 155 mPa·s at 25°C, 25 parts of aspartic resin 5.6 parts of aspartame resin with a viscosity of 300mPa·s at ℃, then add 2 parts of wetting and dispersing agent and 2.5 parts of UV absorber, disperse and mix for 20-40min at a speed of 1300-1700r / min, add 3 parts of pigment, filler 49 parts and disperse and mix at a speed of 2800r / min to 3200r / min for 55min to 65min, add 1.5 parts of thixotropic agent and disperse and mix at a speed of 1300 to 1700r / min for 20 to 40min to make the coating fineness below 40μm and then filter A component can be obtained;

[0048] Preparation of component B: uniformly blend 33 parts of curing agent and 0.5 parts of catalyst in a container and then filter to obtain component B. The curing agent is two polyisocyanates with viscositie...

Embodiment 3

[0050] Preparation of component A: Put 30 parts of polyester polyol and 15 parts of aspartic resin in a container and stir evenly, wherein the proportion of aspartic resin is 10.5 parts of aspartic resin with a viscosity of 155 mPa·s at 4.5 parts of aspartame resin with a viscosity of 300mPa·s at ℃, then add 2.5 parts of wetting and dispersing agent and 1.5 parts of UV absorber, disperse and mix for 20-40min at a speed of 1300-1700r / min, add 3.5 parts of pigment, filler 45.5 parts and disperse and mix at a speed of 2800r / min to 3200r / min for 55min to 65min, add 2 parts of thixotropic agent and disperse and mix at a speed of 1300 to 1700r / min for 20 to 40min to make the coating fineness below 40μm and then filter A component can be obtained;

[0051] Preparation of component B: uniformly blend 29 parts of curing agent and 0.5 part of catalyst in a container and then filter to obtain component B. The curing agent is two polyisocyanates with viscosities of 500mPa·s and 2500mPa·s ...

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Abstract

The invention provides a polyurethane coating with high solid content and high weather resistance and a preparation method thereof. The polyurethane coating is prepared from a component A and a component B, wherein the component A is prepared from the following ingredients in parts by mass: 20 to 35 parts of polyester polyol resin, 10 to 20.5 parts of polyaspartic ester resin, 1 to 3 parts of wetting dispersant, 1.5 to 2.5 parts of thixotropic agent, 1 to 3 parts of ultraviolet absorbent, 3 to 4 parts of pigment and 35 to 50 parts of filler; the component B is prepared from the following ingredients in parts by mass: 20 to 60 parts of curing agent and 0.4 to 0.6 part of catalyst. The polyurethane coating with high solid content and high weather resistance provided by the invention has theadvantages of low VOC emission load, environment friendliness and no toxicity, meanwhile, the polyurethane coating has an excellent mechanical property and weather resistance, the construction potlife is good, the curing property at normal temperature is good, the range of application is wide, and the polyurethane coating is especially suitable for the industrial coating under special environments such as ships and ocean platform atmospheric regions.

Description

technical field [0001] The invention relates to the technical field of polyurethane coatings, in particular to a polyurethane coating with high solid content and high weather resistance and a preparation method thereof. Background technique [0002] With the popularization of energy-saving emission reduction and green environmental protection concepts in the shipbuilding industry, in order to meet more stringent environmental protection standards and reduce environmental pollution, higher requirements are put forward for the performance and product structure of ship coatings. At present, research and development are highly High-quality, environmentally friendly, and low-pollution high-solid coatings have become the main development trend of environmentally friendly coatings. High-solid coatings are a type of coatings with extremely low solvent content. Generally, the solid content is required to be more than 70% of the coating. During the spraying and drying process, the VOC...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D175/06C09D7/61C09D7/63C08G18/42C08G18/60
Inventor 徐静张贤慧康瑞瑞苏雅丽
Owner XIAMEN SUNRUI SHIP COATING
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