Nano titanium dioxide/ acrylate composite emulsion and preparation method thereof

A nano-titanium dioxide, acrylate technology, applied in the direction of adhesive types, graft polymer adhesives, coatings, etc., can solve problems such as poor reaction stability, achieve good compatibility, excellent heat resistance, avoid The effect of agglomeration

Inactive Publication Date: 2012-06-27
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shortcoming of poor reaction stability in the process of preparing nano-titanium dioxide / acrylate composite emulsion by in-situ emulsion polymerization, to provide a nano-titanium dioxide that avoids agglomeration of nano-titanium dioxide, promotes stable polymerization, and has a simple preparation process. / Acrylate composite emulsion and preparation method thereof

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Mix 1.2g concentrated hydrochloric acid (mass concentration 36%) and 4.0g deionized water, add to the mixture of 15.2g butyl titanate and 20.5g absolute ethanol, stir for 0.5h, then add 0.6g silane Combined agent A-151, stirred for 24 hours, heated to 80°C for 0.5 hours, and the product was centrifugally washed, dried and ground to obtain nano-titanium dioxide.

[0020] Mix 0.7g sodium lauryl sulfate, 0.4g nonylphenol polyoxyethylene ether, 15g methyl methacrylate, 5g butyl acrylate, 3g acrylic acid, 30g deionized water and 2g nano-titanium dioxide, and mechanically stir for 10min , then ultrasonically disperse for 10 minutes, gradually raise the temperature to 70°C, add an aqueous solution made of 0.18g potassium persulfate and 5g deionized water to initiate the reaction, adjust the temperature to 75°C and keep it warm for 1.5h. Then drop the pre-emulsion made of 0.8g sodium lauryl sulfate, 0.4g nonylphenol polyoxyethylene ether, 25g methyl methacrylate, 30g butyl acry...

Embodiment 2

[0022] Mix 1.2g concentrated hydrochloric acid (mass concentration 36%) and 4.0g deionized water, add to the mixture of 15.2g butyl titanate and 18g absolute ethanol, stir for 0.5h, then add 1.2g silane coupling Agent A-174, stirred for 24 hours, heated to 80°C for 0.5 hours, and the product was centrifugally washed, dried and ground to obtain nano-titanium dioxide.

[0023] Mix 0.8g sodium dodecylbenzenesulfonate, 0.4g nonylphenol polyoxyethylene ether, 12g methyl methacrylate, 8g butyl acrylate, 3g acrylic acid, 30g deionized water and 3g nano-titanium dioxide, mechanically stir After 10 minutes, ultrasonically disperse for another 10 minutes, gradually raise the temperature to 70°C, add an aqueous solution made of 0.18g potassium persulfate and 5g deionized water to initiate the reaction, adjust the temperature to 75°C and keep it warm for 1.5h. Then drop the pre-emulsion made of 1.0g sodium lauryl sulfate, 0.5g nonylphenol polyoxyethylene ether, 25g methyl methacrylate, 25...

Embodiment 3

[0025] Mix 2.4g of concentrated hydrochloric acid (mass concentration 36%) and 8.0g of deionized water, add to the mixture of 20.5g of butyl titanate and 13.8g of absolute ethanol, stir for 0.5h, then add 1.8g of silane Combined agent A-171, stirred for 24 hours, heated to 80°C for 0.5 hours, and the product was centrifugally washed, dried and ground to obtain nano-titanium dioxide.

[0026]Mix 1.2g sodium dodecylbenzenesulfonate, 0.4g nonylphenol polyoxyethylene ether, 12g methyl methacrylate, 8g butyl acrylate, 3g acrylic acid, 30g deionized water and 1g nano-titanium dioxide, mechanically stir After 10 minutes, ultrasonically disperse for another 10 minutes, gradually raise the temperature to 70°C, add an aqueous solution made of 0.18g ammonium persulfate and 5g deionized water to initiate the reaction, adjust the temperature to 75°C and keep it warm for 1.5h. Then dropwise add a mixture of 1.0g sodium lauryl sulfate, 0.5g nonylphenol polyoxyethylene ether, 20g methyl metha...

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Abstract

The invention discloses nano titanium dioxide / acrylate composite emulsion and a preparation method thereof. The method comprises the following steps of: hydrolyzing butyl titanate to generate nano titanium dioxide sol in absolute ethanol by using hydrochloric acid as a catalyst, adding a vinyl-containing silane coupling agent for modifying the sol, performing centrifugal washing, drying and grinding on the obtained product to obtain nano titanium dioxide, and thus obtaining the nano titanium dioxide / acrylate composite emulsion by using acrylate monomers of methyl methacrylate, butyl acrylate and the like as reaction monomers and adopting a method combining in-situ emulsion polymerization and seed emulsion polymerization. The nano titanium dioxide / acrylate composite emulsion prepared by the method has good storage stability and is stable in a polymerization reaction process; and a film formed by the composite emulsion has good hardness, impact strength and heat resistance.

Description

technical field [0001] The invention relates to the field of acrylate composite emulsion, in particular to a nano titanium dioxide / acrylate composite emulsion and a preparation method thereof. Background technique [0002] Since emulsion polymerization was applied to industrial production in the 1930s, acrylate emulsions have been widely used in coatings and adhesives due to their excellent gloss retention, color retention, and weather resistance. However, its disadvantages such as low hardness, poor heat resistance and water and oil resistance limit its application range to a certain extent. Nano-titanium dioxide not only has small size effect, surface interface effect, quantum size effect and macroscopic quantum tunneling effect, but also has ultraviolet shielding effect, photocatalytic effect, etc., and has been compounded with acrylate emulsion to improve the comprehensive performance of the emulsion. . However, due to the large specific surface area and high surface e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F292/00C08F220/14C08F220/18C08F220/06C08F2/24C09D151/10C09J151/10
Inventor 李红强曾幸荣叶超贤蔡阿满
Owner SOUTH CHINA UNIV OF TECH
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