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Preparation method of cationic styrene-acrylic microemulsion

A cationic, microemulsion technology, applied in the field of new materials, can solve the problems of low monomer conversion rate, high gel content, poor emulsion stability, etc.

Active Publication Date: 2014-07-09
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used to prepare cationic polymer emulsions, there are defects such as low monomer conversion rate, high gel content, and poor emulsion stability (Fan Shuli et al., Synthesis of Cationic Acrylate Copolymer Emulsion. Journal of Shenyang University of Technology, 2011, 30(3):76)

Method used

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  • Preparation method of cationic styrene-acrylic microemulsion
  • Preparation method of cationic styrene-acrylic microemulsion
  • Preparation method of cationic styrene-acrylic microemulsion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In a 250mL three-necked flask, add 30ml of deionized water and 0.08g of G16-6-G16 cationic gemini surfactant (accounting for 10wt% of the total amount of surfactants), stir under nitrogen protection, and dropwise add 30.4g of styrene, A mixed monomer of 7.6 grams of butyl acrylate and 1.14 grams of acrylic acid (accounting for 95 wt% of the total amount of monomers), after the monomers were added dropwise in 30 minutes, was stirred and mixed uniformly to obtain a styrene-acrylic pre-emulsion.

[0025] Add 90ml of deionized water, 0.72g of G16-6-G16 cationic gemini surfactant (accounting for 90wt% of the total amount of surfactants), 0.1g of azobisisobutyl Amidine hydrochloride initiator (accounting for 50wt% of the total amount of initiators), under the protection of nitrogen, the stirring rate is controlled at 250rpm, after the temperature is raised to 70°C, 1.6 grams of styrene, 0.4 grams of butyl acrylate, and 0.06 grams of acrylic acid are added. (accounting for 5wt...

Embodiment 2

[0027] In a 250mL three-neck flask, add 30ml of deionized water and 0.03g of G16-6-G16 cationic gemini surfactant (accounting for 9.4wt% of the total amount of surfactants), stir under nitrogen protection, and add 30.4g of styrene dropwise , 7.6 grams of butyl acrylate, 1.14 grams of mixed monomers of acrylic acid (accounting for 95wt% of the total amount of monomers), after the monomers were added dropwise in 30 minutes, they were stirred and mixed uniformly to obtain a styrene-acrylic pre-emulsion.

[0028]Add 90ml of deionized water, 0.29g of G16-6-G16 cationic gemini surfactant (accounting for 90.6wt% of the total amount of surfactants), 0.1g of azobisiso Butyamidine hydrochloride initiator (accounting for 50wt% of the total amount of initiators), under the protection of nitrogen, the stirring rate is controlled at 250rpm. After the temperature is raised to 70°C, a mixture of 1.6 grams of styrene, 0.4 grams of butyl acrylate and 0.06 grams of acrylic acid is added. Monomer...

Embodiment 3

[0030] In a 250mL three-necked flask, add 30ml of deionized water and 0.48g of G16-3-G16 cationic gemini surfactant (accounting for 20wt% of the total amount of surfactants), stir under nitrogen protection, and dropwise add 28.8g of styrene, A mixed monomer of 7.2 grams of butyl acrylate and 1.08 grams of methacrylic acid (accounting for 90 wt% of the total amount of monomers), after the monomers were added dropwise in 30 minutes, was stirred and mixed uniformly to obtain a styrene-acrylic pre-emulsion.

[0031] Add 90ml of deionized water, 1.92g of G16-3-G16 cationic gemini surfactant (accounting for 80wt% of the total amount of surfactants), 0.1g of azobisisobutyl Imidazoline hydrochloride initiator (accounting for 50wt% of the total amount of initiators), under the protection of nitrogen, the stirring rate is controlled at 250rpm, and after the temperature is raised to 70°C, add 3.2 grams of styrene, 0.8 grams of butyl acrylate, and 0.12 grams of methacrylic acid The mixed ...

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Abstract

Aiming at the defects of high emulsifier content, wide size distribution, and poor emulsion stability in the existing preparation method of cationic styrene-acrylic microemulsion, the invention provides a method for preparing a cationic styrene-acrylic microemulsion. The method comprises the steps of: first preparing a styrene-acrylic pre-emulsion by using a cationic dimeric surfactant as an emulsifier; then preparing a seed latex by using a water-soluble azo compound as an initiator; then adding the styrene-acrylic pre-emulsion and the water-soluble azo initiator to the seed latex continuously to prepare the cationic styrene-acrylic microemulsion. The method has the advantage that the prepared cationic styrene-acrylic microemulsion has low emulsifier content, narrow particle size distribution, low gel rate and good emulsion stability.

Description

technical field [0001] The invention belongs to the technical field of new materials, and relates to a preparation method of cationic styrene-acrylic microemulsion, in particular to a cationic styrene-acrylic microemulsion with low emulsifier content, narrow particle size distribution, good stability and low gel rate method of preparation. Background technique [0002] Cationic styrene-acrylic microemulsion is a nano-scale latex dispersion liquid with positive charge on the surface. It has unique charge characteristics and has incomparable advantages in many aspects over anionic and nonionic emulsions. Antibacterial agents, complexes of drugs and DNA, and latex particle agglutination immunoassays are widely used. There are two conventional preparation methods for microemulsions. One is to mix organic solvents, water, and emulsifiers evenly before adding additives, and the system will become a transparent microemulsion at a certain moment; the other is to mix organic solvent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/18C08F220/28C08F220/14C08F220/06C08F220/56C08F222/16C08F222/02C08F2/26C08F4/04
Inventor 解孝林周兴平杨琴孙燕华
Owner HUAZHONG UNIV OF SCI & TECH
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