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Polyurethane emulsion and antireflection coating liquid prepared from polyurethane emulsion

A technology of polyurethane emulsion and coating solution, which is applied in polyurea/polyurethane coatings, reflective/signal coatings, coatings, etc., and can solve problems such as poor abrasion resistance and weather resistance of coatings, and restrictions on the use of polyurethane

Active Publication Date: 2020-07-14
厦门威亮光学涂层技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Tetraethyl silicate is hydrolyzed under acidic conditions, and the hydrolysis rate is greater than the polycondensation rate, forming a linear structure, which is easy to form a coating structure on the surface of cationic polyurethane. Self-polymerization forms a spherical structure, so the co-hydrolysis of tetraethyl orthosilicate and polyurethane to form a core-shell structure can only be carried out under acidic conditions, which limits the use of polyurethane, and only cationic polyurethane can be used
[0005] The spherical particles with a core-shell structure obtained by the above two patents are obtained through the tetraethyl silicate route. During the coating and film forming process of the spherical particles, a large number of gaps are generated due to the stacking between the spherical particles. Will eliminate, may bring disadvantages such as poor abrasion resistance and weather resistance to the coating

Method used

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  • Polyurethane emulsion and antireflection coating liquid prepared from polyurethane emulsion
  • Polyurethane emulsion and antireflection coating liquid prepared from polyurethane emulsion
  • Polyurethane emulsion and antireflection coating liquid prepared from polyurethane emulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0095] Prepare polyurethane emulsion, the steps are as follows:

[0096] 1) Take 89.47g of PPG6000 (two functional groups) after vacuuming to remove water (Dow Chemical, hydroxyl content 0.03mol), 33.6g isophorone diisocyanate (Wanhua Chemical, NCO content 0.3mol), catalyst dilauric acid 0.020 g of dibutyltin was added to the reactor, and mixed and stirred at 50° C. for 2 hours.

[0097] 2) Dissolve 18.52g of chain extender 2,2-dimethylolbutanoic acid (hydroxyl content: 0.25mol) into 92.83g of solvent N-methylpyrrolidone, then slowly add to the above solution, at a temperature of 50°C, The reaction was continued for 2 hours.

[0098] 3) Add neutralizing agent ammonia 17.52g (25% concentration) to above-mentioned solution, after stirring evenly, then add it into 1074.14g deionized water emulsification and obtain the nano polyurethane emulsion of solid content 12%.

[0099] Its particle size was tested to be 100nm. The thermal decomposition residual rate of the polyurethane e...

Embodiment 2

[0104] Prepare polyurethane emulsion, the steps are as follows:

[0105] 1) Take 14.83g of polyether polyol PPG-600 (2 functional groups) after vacuuming to remove water (Dow Chemical, hydroxyl content 0.05mol), 25.07g diphenylmethane diisocyanate (BASF M20S, NCO content 0.2mol), The catalyst, 0.024 g of dibutyltin diacetate, was added to the reactor, and mixed and stirred at 50° C. for 4 hours.

[0106] 2) Dissolve 55.56g of chain extender 2,2-dimethylolbutanoic acid (0.75mol of hydroxyl content) into 78.51g of solvent propylene glycol butyl ether, then slowly add to the above solution, and continue the reaction at a temperature of 50°C 2 hours.

[0107] 3) Add neutralizing agent 105.16g ammonia water (25% concentration) to above-mentioned solution, after stirring evenly, then add it into 593.21g deionized water emulsification and obtain the nano polyurethane emulsion of solid content 23%. Its particle size was tested to be 50nm. The thermal decomposition residual rate was...

Embodiment 3

[0112] 1) Take 124.12g of polyether polyol PPG-2000 (two functional groups) after vacuuming to remove water (Dow Chemical, hydroxyl content 0.125mol), 428.57g of hexamethylene diisocyanate-based polyisocyanate (Wanhua Chemical HT-90B , NCO content 2mol), 0.1934g of catalyst tin octoate was added into the reactor, and mixed and stirred at 50°C for 2 hours.

[0113] 2) Dissolve 37.04g of chain extender 2,2-dimethylolbutanoic acid (hydroxyl content: 0.5mol) into 377.09g of solvent ethyl acetate, then slowly add to the above solution, and continue the reaction at a temperature of 50°C 2 hours.

[0114] 3) Add 10 g of neutralizing agent sodium hydroxide to the above solution, stir evenly, then add it into 2452.12 g of deionized water for emulsification to obtain a nano polyurethane emulsion with a solid content of 17.5%.

[0115] Its particle size was tested to be 80nm. The thermal decomposition residual rate was tested by thermogravimetric analysis equipment, and the residual ra...

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Abstract

The invention relates to a polyurethane emulsion and an antireflection coating liquid prepared from the polyurethane emulsion, in the polyurethane emulsion, the particle size range of the polyurethaneemulsion is 20-150nm, and the polyurethane emulsion is prepared from the following raw materials: polyol, isocyanate, a catalyst, a chain extender, a first solvent, a neutralizer and deionized water.The antireflection coating liquid is prepared from the following raw materials: alkoxy silane, deionized water, a hydrolysis catalyst, the polyurethane emulsion, a second solvent and an auxiliary agent. The polyurethane emulsion is used as a pore-forming agent and has good compatibility with other components in an antireflection film solution, and an antireflection film prepared from the antireflection film coating solution prepared from the polyurethane emulsion has the advantages of high anti-reflection performance, good wear resistance, good weather resistance and the like.

Description

technical field [0001] The invention relates to the preparation technology of a pore-forming agent, in particular to a polyurethane emulsion and an anti-reflection coating solution prepared therefrom. Background technique [0002] Solar energy is a clean and renewable energy. With the shortage of coal, oil and other energy sources, the development of solar energy is becoming more and more important. Generally speaking, materials with a large refractive index also have a large reflectivity. The average light transmittance of solar photovoltaic glass used to protect monocrystalline silicon cells is about 91.5%, and about 8% of sunlight will be reflected. In order to increase the light transmittance of solar photovoltaic glass, the current mainstream method is to prepare a layer of low refractive index film on the surface of photovoltaic glass, that is, anti-reflection film. The method commonly used in the industry to form an anti-reflection film is realized by forming a silic...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/48C08G18/42C08G18/10C08G18/34C09D175/08C09D175/06C09D183/04C09D5/33C03C17/30C03C17/32
CPCC08G18/4825C08G18/48C08G18/42C08G18/10C09D175/08C09D175/06C09D5/004C03C17/322C03C17/30C08L83/04C08K5/053C08G18/348
Inventor 吴后胜严国杭肖立铃刘世基
Owner 厦门威亮光学涂层技术有限公司
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