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Method for preparing nano silicon dioxide/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: 2012-09-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Add 2.0g allyloxy nonylphenol propanol polyoxyethylene ether ammonium sulfate (DNS-86) and 0.013g concentrated hydrochloric acid (mass concentration 36%) into 25g deionized water, and mix with 10g butyl acrylate, 10g formazan The mixture of methyl acrylate, 5.5g tetraethyl orthosilicate and 0.5g KH-570 was pre-emulsified for 10min, and stirred on a magnetic stirrer for 12h 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 h, and 10 g of an aqueous solution of potassium persulfate with a weight concentration of 1.5% was added and kept for 30 min.

[0030] At the same time, pre-emulsify 0.4g DNS-86, 10g butyl acrylate, 10g methyl methacrylate, 1.6g acrylic acid and 20g deionized water for 5min to prepare an acrylate pre-emulsion, and then add the acrylate dropwise within 2h The pre-emulsion and 15 g of a 1% potassium persulfate aqueous solution. A...

Embodiment 2

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

Embodiment 3

[0037] 1.5g DNS-86, 0.8g allyloxy nonylphenol propanol polyoxyethylene (ANPEO 10 ) and 0.03g of concentrated hydrochloric acid (mass concentration 36%) were added to 30g of deionized water, and pre-emulsified with a mixture containing 15g of butyl acrylate, 10g of tetraethyl orthosilicate and 1gA-171 for 15min, and stirred on a magnetic stirrer for 24h , to prepare a 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 h, and 10 g of an aqueous solution of potassium persulfate with a weight concentration of 1.5% was added and kept for 40 min. At the same time, add 0.4g DNS-86, 0.2g ANPEO 10 , 7.5g butyl acrylate, 7.5g methyl methacrylate, 0.5g methacrylic acid, 0.5g hydroxyethyl acrylate and 15g deionized water were pre-emulsified for 5min to prepare an acrylate pre-emulsion, and then dropped within 1.5h The acrylate pre-emulsion and 15 g of 1% potassium persulfate aqueous solution were added...

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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 preparation method of a nano silicon dioxide / 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, but also the good wear resistance, high hardness, and Scratch resistance, UV resistance, etc., but also has the characteristics of non-toxic environmental protection, mild reaction conditions, etc., and has 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. However, it has low hardness, poor abrasion resistance, and solvent resistance. Insufficient performance and other shortcomings limit its furt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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