Method for preparing nano titanium dioxide/polyacrylate compound emulsion

A technology of nano-titanium dioxide and polyacrylate, which is applied in the field of composite emulsion, can solve the problems of complicated process and easy agglomeration of nano-titanium dioxide, and achieve the effects of simplifying the process, improving compatibility and avoiding secondary agglomeration

Inactive Publication Date: 2013-05-01
SOUTH CHINA UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages such as complex process and easy agglomeration of nano-titanium dioxide in the preparation of nano-titanium dioxide / polyacrylate composite emulsion by the in-situ emulsion polymerization method, and provide a method for preparing nano-titanium dioxide / polyacrylate with simple process and effectively avoiding the agglomeration of nano-titanium dioxide. The method of polyacrylate composite emulsion

Method used

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  • Method for preparing nano titanium dioxide/polyacrylate compound emulsion
  • Method for preparing nano titanium dioxide/polyacrylate compound emulsion

Examples

Experimental program
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Embodiment 1

[0018] At room temperature, mix 4g of cetyltrimethylammonium bromide (CTAB), 6g of acrylic acid (AA) and 10g of methyl methacrylate (MMA) evenly, and slowly add 14g of deionized water dropwise until the system becomes Clarification; add 2g of butyl titanate and 1g of γ-methacryloxypropyltrimethoxysilane (A-174), control the addition rate to 0.4-0.6g / min, and then stir at room temperature for 24h to obtain Organic nano titanium dioxide system. Add 30g of deionized water to the organic nano-titanium dioxide system, disperse at a speed of 1500rpm / min for 15min, and continue to ultrasonically disperse in an ultrasonic cell disruptor for 10min; In the mixed liquid reactor, heat up to 75°C, stir at a speed of 100rpm / min for 30min, drop the mixed liquid containing 0.1g potassium persulfate and 5g deionized water within 2h, keep warm for 2h, then heat up to 80°C , continue the heat preservation reaction for 1 hour, and finally lower to room temperature to obtain nano-titanium dioxide...

Embodiment 2

[0022] At room temperature, mix 6g of cetyltrimethylammonium bromide (CTAB), 8g of acrylic acid (AA), 10g of methyl methacrylate, and 10g of butyl acrylate, and then slowly drop 15g of deionized water into the system Become clear; add 2.5g butyl titanate and 1.5g vinyltrimethoxysilane (A-171), control the addition rate to 0.4-0.6g / min, then stir at room temperature for 12h to prepare organic nano-titanium dioxide system. Add 40g of deionized water to the organic nano-titanium dioxide system, disperse at a speed of 2500rpm / min for 10min, and continue to ultrasonically disperse in an ultrasonic cell disruptor for 30min; In a liquid reactor, heat up to 70°C and stir for 40min at a speed of 120rpm / min, add dropwise a mixed solution containing 0.5g potassium persulfate and 10g deionized water within 1h, keep warm for 3h, heat up to 90°C, continue Insulate and react for 2 hours, and finally cool down to room temperature to obtain nano-titanium dioxide / polyacrylate composite emulsio...

Embodiment 3

[0024] At room temperature, mix 7g of cetyltrimethylammonium bromide (CTAB), 7g of acrylic acid (AA) and 25g of butyl acrylate, and then slowly add 12g of deionized water until the system becomes clear; add 3g of titanium Acrylic acid butyl ester and 1.5g γ-methacryloyloxypropyltrimethoxysilane (A-174), control the addition rate to 0.4-0.6g / min, and then stir at room temperature for 6h to prepare organic nano-titanium dioxide system. Add 35g of deionized water to the organic nano-titanium dioxide system, disperse at a speed of 800rpm / min for 60min, and continue to ultrasonically disperse in an ultrasonic cell disruptor for 10min; In the liquid reactor, heat up to 65°C and stir for 40min at a speed of 120rpm / min, add dropwise a mixture containing 1g ammonium persulfate and 12g deionized water within 2h, keep warm for 2h, heat up to 85°C, and continue to keep warm React for 2 hours, and finally lower to room temperature to obtain nano-titanium dioxide / polyacrylate composite emu...

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Abstract

The invention discloses a method for preparing a nano titanium dioxide / polyacrylate compound emulsion. The method comprises the steps as follows: at a room temperature, mixing 4-10 parts of hexadecyl trimethyl ammonium bromide, 6-14 parts of acrylic acid and 10-30 parts of an acrylate monomer in parts by mass uniformly and then dropwise adding deionized water until the system becomes clear; adding 2-6 parts of butyl titanate and 1-4 parts of a silane coupling agent, then adding 30-50 parts of deionized water, and performing ultrasonic dispersion; and adding deionized water and hexadecyl trimethyl ammonium bromide, raising the temperature, stirring, and dropwise adding a mixed solution of an initiator and deionized water, performing thermal reaction, raising the temperature to 80-90 DEG C, performing thermal reaction for 0.5-3h continuously, and lowering the temperature to the room temperature to obtain the nano titanium dioxide / polyacrylate compound emulsion. The method is simple in process, and avoids a problem of 'secondary agglomeration' of conventional nano titanium dioxide in a polymerization process of the emulsion effectively, so that a polymerization reaction can proceed smoothly. The prepared nano titanium dioxide / polyacrylate compound emulsion has good stability.

Description

technical field [0001] The invention relates to the field of composite emulsions, in particular to a method for preparing nano-titanium dioxide / polyacrylate composite emulsions by an inverse microemulsion method-in-situ emulsion polymerization method. technical background [0002] Because the nano-titanium dioxide / polyacrylate composite emulsion not only has excellent film-forming properties, transparency, flexibility, and easy processing of polyacrylate, but also has outstanding wear resistance, high hardness, scratch resistance, and UV resistance of nano-titanium dioxide. properties, etc., and the use of water as the dispersion medium is beneficial to environmental protection, so it has become one of the hotspots of research in recent years. [0003] The preparation methods of nano-titanium dioxide / polyacrylate composite emulsion are mainly divided into mechanical blending method and in-situ emulsion polymerization method. Although the mechanical blending process is simpl...

Claims

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Application Information

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IPC IPC(8): C08F220/14C08F220/18C08F220/28C08F212/08C08F220/06C08F230/08C08F2/32C08F2/44C08K9/06C08K3/22
Inventor 李红强曾幸荣李坤泉赖学军谢湖
Owner SOUTH CHINA UNIV OF TECH
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