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Method for preparing core-shell nano SiO2/fluorine-containing polyacrylate soap-free emulsion

A polyacrylate, soap-free emulsion technology, used in textiles, papermaking, fiber processing, etc., can solve problems such as adverse effects on the environment and operator safety, reducing film adhesion, antifouling, and emulsion stability. Elimination of adverse effects, excellent water and oil repellency, small dispersion effect

Active Publication Date: 2013-09-11
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fluorine-containing polyacrylate emulsions are mainly prepared by small-molecule emulsifiers. However, the use of small-molecule emulsifiers causes fluorine-containing polyacrylate emulsions to have the following disadvantages: the emulsifier is attached to the surface of the latex particles by physical adsorption, and it is easy to Desorption occurs under the influence of the external environment, causing the latex particles to collide and coagulate, thereby deteriorating the stability of the emulsion; during the film formation process of the emulsion, the emulsifier migrates to the surface of the film, which limits the enrichment of fluorine-containing components on the surface of the latex film. Reduce the adhesion, water repellency, oil repellency and antifouling properties of the film, and the waste liquid containing emulsifier will pollute the environment
This method has the advantages of higher solid content of the emulsion and faster polymerization speed, but the co-solvent is an organic solvent, which will lead to an increase in the VOC value of the aqueous emulsion (VOC: short for volatile organic compounds), which is harmful to the environment and environment to a certain extent. adverse effect on the safety of the operator

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) In terms of parts by mass, mix 5 parts of methyl methacrylate, 33 parts of butyl acrylate, 3 parts of allyloxy hydroxypropyl sodium sulfonate, and 38 parts of deionized water, and then stir at high speed Emulsify for 10 minutes to obtain milky white stable pre-emulsion A;

[0022] 2) In parts by mass, 10 parts of methyl methacrylate, 6 parts of lauryl acrylate, 3 parts of dodecafluoroheptyl methacrylate, 10 parts of γ-methacryloyloxypropyl Trimethoxysilane, 3 parts of allyloxy hydroxypropyl sodium sulfonate and 1-allyloxy-3-(4-nonylphenol)-2-propanol polyoxyethylene with a mass ratio of 1:2 (10) An anionic polymerizable emulsifier formed by mixing ether monophosphoric acid, mixed with 25 parts of deionized water, and then emulsified with high-speed stirring for 30 minutes to obtain a milky white stable pre-emulsion B;

[0023] 3) In terms of parts by mass, add 23 parts of deionized water, 0.2 parts of potassium persulfate and 1 / 4 part of pre-emulsion A to a three-ne...

Embodiment 2

[0027]1) In parts by mass, 30 parts of methyl methacrylate, 8 parts of butyl acrylate, 2 parts of 2-acrylamido-2-methyl-propyl sodium sulfonate, 20 parts of deionized Mix with water, then stir and emulsify at high speed for 20 minutes to obtain milky white stable pre-emulsion A;

[0028] 2) In parts by mass, 10 parts of butyl acrylate, 1 part of hexadecyl acrylate, 20 parts of trifluoroethyl acrylate, 10 parts of γ-methacryloxypropyltrimethoxysilane, Mix 3 parts of 1-allyloxy-3-(4-nonylphenol)-2-propanol polyoxyethylene (10) ether ammonium sulfate and 40 parts of deionized water, then stir and emulsify at high speed for 30 minutes to obtain milky white Stable pre-emulsion B;

[0029] 3) In terms of parts by mass, add 46 parts of deionized water, 0.5 parts of sodium persulfate and 1 / 6 part of pre-emulsion A to a three-necked bottle equipped with a stirrer, a thermometer and a feeding device. React for 30 minutes, then drop the remaining pre-emulsion A and an aqueous solution ...

Embodiment 3

[0033] 1) In parts by mass, mix 9 parts of methyl methacrylate, 14 parts of butyl acrylate, 1 part of allyloxy hydroxypropyl sodium sulfonate, and 26 parts of deionized water, then stir at high speed Emulsified for 20 minutes to obtain milky white stable pre-emulsion A;

[0034] 2) In terms of parts by mass, 8 parts of methyl methacrylate, 6 parts of butyl acrylate, 3 parts of octadecyl acrylate, 10 parts of octafluoropentyl methacrylate, and 9 parts of γ-methyl methacrylate Acryloyloxypropyltrimethoxysilane, 3 parts of 1-allyloxy-3-(4-nonylphenol)-2-propanol polyoxyethylene (10) ether ammonium sulfate and nonylphenol polyoxygen The emulsifier compound formed by mixing ethylene (4) ether acrylate and 32 parts of deionized water was mixed, and then emulsified with high-speed stirring for 10 minutes to obtain a milky white stable pre-emulsion B; wherein, 1-ene in the added emulsifier compound The mass fraction of propoxy-3-(4-nonylphenol)-2-propanol polyoxyethylene (10) ether a...

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Abstract

The invention provides a method for preparing a core-shell nano SiO2 / fluorine-containing polyacrylate soap-free emulsion. The method provided by the invention can be used for synthesizing the core-shell nano SiO2 / fluorine-containing polyacrylate soap-free emulsion by introducing nano SiO2 by a sol-gel method and copolymerizing a polymerizable emulsifier, a fluorinated acrylic ester monomer and an acrylate monomer with double-bond alkoxy silane, by a soap-free emulsion polymerization technique; and the core-shell nano SiO2 / fluorine-containing polyacrylate soap-free emulsion is suitable for being used as a fabric waterproof / oilproof finishing agent. The method provided by the invention has the advantages that negative influence of a small molecular emulsifier on fluorine containing polyacrylate is eliminated, excellent properties of nano SiO2 are introduced into the fluorine-containing polyacrylate and the fluorine-containing monomer is located at the shell layer, and therefore, a fabric finishing agent with excellent water repellence and oil repellence is obtained; and compared with the similar products, the fabric finishing agent prepared by the method provided by the invention is low in cost.

Description

technical field [0001] The invention relates to a preparation method of a fluorine-containing fabric finishing agent, in particular to a core-shell nano-SiO 2 / The preparation method of fluorine-containing polyacrylate soap-free emulsion. Background technique [0002] Fluorine-containing polyacrylate polymers contain fluorine-containing side chain groups and have low surface free energy. Therefore, on the basis of maintaining good film-forming properties, flexibility and adhesiveness of non-fluorine-containing polyacrylate polymers, Fluoropolymers have the advantages of good thermal stability, strong chemical inertness, water repellency, oil repellency and stain resistance, etc., and are widely used in waterproof finishing, oil repellent finishing and antifouling finishing of textiles. In recent years, based on the requirements of environmental protection and resources, water-based fluorinated polyacrylate emulsion has become a research hotspot. At present, fluorine-conta...

Claims

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Application Information

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IPC IPC(8): C08F220/18C08F220/14C08F220/22C08F230/08C08F2/26C08F2/30C08K3/36D06M15/277D06M15/356D06M11/79
Inventor 周建华鲁妮段昊马玉蓉吕晓敏吴晶方立姚小萍
Owner SHAANXI UNIV OF SCI & TECH
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