Waterborne polyurethane-silica sol antifogging coating and preparation method and application thereof

A water-based polyurethane and anti-fog coating technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of weak bonding, poor durability, instability, etc., and achieve improved transparency, low VOC content, and increased use time. Effect

Active Publication Date: 2022-02-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problems of weak, unstable, poor durability and high VOC in the coating of anti-fog coatings, the purpose of the present invention is to provide a water-based polyurethane-silica sol anti-fog coating and its preparation method and application

Method used

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  • Waterborne polyurethane-silica sol antifogging coating and preparation method and application thereof
  • Waterborne polyurethane-silica sol antifogging coating and preparation method and application thereof
  • Waterborne polyurethane-silica sol antifogging coating and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) 8.33 g of IPDI is added to 14.4 g of PPG-2000 and 3.6 g of PEG-400, a stirrer, a thermometer, and a condensed tube, and stirred to 80 ° C, and February Dibutyltin catalyst, reaction 2H, then add 0.18 g of TMP and 1.35 g of dihydroxymethropion acid at the same temperature, reacted for 1 h and 2h, respectively; temperature above 90 ° C, 2.48 g of pentaerythritol is added, and 2.5 h, The terminal hydroxy polyurethane prepolymer was obtained; the viscosity of the system was added to acetone.

[0047] (2) The system temperature was reduced to 65 ° C, and 1.68 g IPTES was added, and the reaction was reacted for 3 h, and the terminal hydroxyl silicone-polyurethane prepolymer was obtained.

[0048] (3) The system was cooled to 45 ° C, and 1.02 g of triethylamine was added, and the reaction was 30 min; poured into the polyurethane prepolymer described above into the dispersion bucket, and then 64.5 g of deionized water at high speed. The slowly poured, was subjected to dispersio...

Embodiment 2

[0052] As compared with Example 1, an aqueous polyurethane emulsion-silica sol composite coating was prepared, and the first type of polyol added in step (1), the second type of polyol, respectively Changed to 14.4 g of PCL-2000 and 3.6 g of PEG-600, the rest of the other.

Embodiment 3

[0054] As compared with Example 1, an aqueous polyurethane emulsion-silica sol composite coating was prepared, and the first type of polyol solution in step (1) was changed to 14.4 g of PHA-2000. Exactly the same.

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Abstract

The invention discloses a waterborne polyurethane-silica sol antifogging coating and a preparation method and application thereof. The preparation method comprises the following steps: firstly, carrying out end capping on a prepolymer synthesized by an acetone method by using a polyhydroxy end-capping reagent to obtain a hydroxyl-terminated polyurethane prepolymer; then carrying out chemical bonding reaction with a silane coupling agent with an isocyanate group to obtain a hydroxyl-terminated organic silicon-polyurethane prepolymer; and finally, stirring and mixing the waterborne polyurethane emulsion, silica sol and a curing agent so as to obtain the waterborne polyurethane-silica sol antifogging coating. The waterborne polyurethane-silica sol antifogging coating can form a smooth coating with relatively high transparency and relatively lasting antifogging aging at high temperature, and the coating has the remarkable characteristics of transparency, wear resistance and water resistance. Meanwhile, the synthesis method is simple, the synthesis process is green and environment-friendly, and the VOC content is low.

Description

Technical field [0001] The present invention belongs to the technical field of waterborne coating, and more particularly to an aqueous polyurethane-silica sol anti-fog coating and preparation method thereof. Background technique [0002] These transparent materials such as glasses, bathroom mirrors, automotive windshields, greenhouse sheds, goggles, and surgical intratoscopy, etc., often encounter fog in daily life. When the substrate and the environment there is a large temperature difference, and when the temperature of the surface of the substrate is lower than the dew point of the water vapor in the environment, the water vapor is condensed into water droplets on the surface of the substrate; and the presence of water droplets will generate light scattering. , Refractive phenomena, which not only affects the transparency of transparent materials, but also brings great inconvenience to life, work and production, or even leads to danger. Therefore, solving the fog problem is a ...

Claims

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Application Information

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IPC IPC(8): C09D175/04C09D175/08C09D7/61C08J7/054C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32C08G18/12C08G18/71C08L69/00
CPCC09D175/04C09D175/08C09D7/61C08J7/054C08J7/0427C08G18/12C08G18/4833C08G18/4808C08G18/3206C08G18/348C08G18/6692C08G18/718C08G18/4277C08G18/6625C08G18/4238C08G2150/00C08J2369/00C08J2475/04C08J2475/08C08K3/36
Inventor 夏正斌颜欢
Owner SOUTH CHINA UNIV OF TECH
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