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Method for preparing nano silicon/polyacrylate composite emulsion

A technology of nano-silica and polyacrylate, which is applied in the direction of coating, etc., can solve the problems of complex process and easy agglomeration of nano-silica, and achieve the effects of simplifying the process, good dispersion, and avoiding secondary agglomeration

Inactive Publication Date: 2011-04-27
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 disadvantages of complex process and easy agglomeration of nano-silica in the preparation of nano-silica / polyacrylate composite emulsion by in-situ emulsion polymerization, and provide a method that avoids the problem of agglomeration of nano-silica. The preparation method of the nano silicon dioxide / polyacrylate composite emulsion with stable polymerization process and simple preparation process

Method used

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  • Method for preparing nano silicon/polyacrylate composite emulsion
  • Method for preparing nano silicon/polyacrylate composite emulsion
  • Method for preparing nano silicon/polyacrylate composite emulsion

Examples

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Effect test

Embodiment 1

[0028] Add 2.0g of allyloxynonylphenol propanol polyoxyethylene ether ammonium sulfate (DNS-86) and 0.013g of concentrated hydrochloric acid (mass concentration 36%) into 25g of deionized water, and mix with 10g of butyl acrylate and 10g of methyl methacrylate. The mixed liquid of methyl acrylate, 5.5 g of ethyl orthosilicate and 0.5 g of KH-570 was pre-emulsified for 10 minutes and stirred on a magnetic stirrer for 12 hours to prepare a modified nano-silica pre-emulsion.

[0029] At a temperature of 75° C., the modified nano-silica emulsion was added dropwise to 35 g of deionized water within 1.5 hours, and 10 g of potassium persulfate aqueous solution with a weight concentration of 1.5% was added, and the temperature was maintained for 30 minutes.

[0030] At the same time, 0.4g DNS-86, 10g butyl acrylate, 10g methyl methacrylate, 1.6g acrylic acid and 20g deionized water were pre-emulsified for 5 minutes to prepare acrylate pre-emulsion, and then the acrylate was added dropwise w...

Embodiment 2

[0035] Add 1.3g DNS-86 and 0.01g concentrated hydrochloric acid (mass concentration 36%) into 25g deionized water, and add 5g 2-ethylhexyl methacrylate, 5g methyl acrylate, 1.5g ethyl orthosilicate Pre-emulsify the mixture with 0.1g KH-570 for 10 minutes and stir for 8 hours on a magnetic stirrer to prepare a modified nano-silica pre-emulsion. At 75° C., the modified nano-silica emulsion was added dropwise to 35 g of deionized water within 1 h, and 5 g of potassium persulfate aqueous solution with a weight concentration of 1% was added, and the temperature was kept for 20 minutes. At the same time, 0.2g DNS-86, 10g butyl acrylate, 10g methyl methacrylate, 0.6g acrylic acid and 20g deionized water were pre-emulsified for 5 minutes to prepare acrylate pre-emulsion, and then the acrylate was added dropwise within 2h Pre-emulsion and 5g of potassium persulfate aqueous solution with a mass concentration of 1%. After the addition, the temperature was raised to 80°C, and the temperat...

Embodiment 3

[0037] 1.5g DNS-86, 0.8g allyloxy nonyl phenol propanol polyoxyethylene (ANPEO 10 ) And 0.03g concentrated hydrochloric acid (mass concentration 36%) were added to 30g deionized water, and pre-emulsified with a mixture containing 15g butyl acrylate, 10g ethyl orthosilicate and 1g A-171 for 15min, and stirred on a magnetic stirrer for 24h , Prepare modified nano-silica pre-emulsion. At 70° C., the modified nano-silica emulsion was added dropwise to 35 g of deionized water within 1.5 hours, and 10 g of potassium persulfate aqueous solution with a weight concentration of 1.5% was added, and the temperature was maintained for 40 minutes. At the same time, 0.4g DNS-86, 0.2g ANPEO 10 , 7.5g of butyl acrylate, 7.5g of methyl methacrylate, 0.5g of methacrylic acid, 0.5g of hydroxyethyl acrylate and 15g of deionized water are pre-emulsified for 5 minutes to prepare an acrylic pre-emulsion, and then drip within 1.5h After adding the acrylic ester pre-emulsion and 15 g of potassium persul...

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Abstract

The invention discloses a method for preparing nano silicon / polyacrylate composite emulsion. The method comprises the following steps of: adding the adding hydrochloric solution and an emulsifier into de-ionized water, mixing the mixed solution and tetraethoxysilane, a silane coupling agent and acrylate monomers and pre-emulsifying to obtain modified nano silicon pre-emulsion; heating, adding an initiator, and preparing the nano silicon / polyacrylate composite emulsion by adopting an in-situ emulsion polymerization and seed emulsion polymerization combined method. The method has a simple process, solves the problem of 'secondary aggregation' of the traditional nano silicon during emulsion polymerization and effectively guarantees the stable proceeding of a polymerization reaction, the prepared nano silicon / polyacrylate composite emulsion has high stability, and the film of the nano silicon / polyacrylate composite emulsion has high heat resistance.

Description

Technical field [0001] The invention relates to a polyacrylate composite emulsion, in particular to a method for preparing a nano-silica / polyacrylate composite emulsion. technical background [0002] Organic / inorganic nanocomposite emulsions emerged in the late 1980s. It not only combines the excellent film-forming properties, transparency, flexibility, and ease of processing of polymer materials, as well as the good wear resistance, high hardness, Scratch resistance, UV resistance, etc., but also non-toxic, environmentally friendly, and mild reaction conditions have become a hot spot in current research. [0003] Polyacrylate emulsion has excellent gloss retention, color retention, and weather resistance. It is a matrix resin widely used in coatings, adhesives, and fabric finishing agents, but it has low hardness, poor wear resistance, and solvent resistance. Shortcomings such as lack of sex limit its further application. Due to its wide range of sources and low price, nano-sili...

Claims

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Application Information

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IPC IPC(8): C08F292/00C08F220/14C08F220/18C08F220/06C09D151/10
Inventor 李红强曾幸荣叶雨佐叶超贤陈平绪
Owner SOUTH CHINA UNIV OF TECH
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