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Fluoropolymer modified polyacrylate dispersion and its preparation and use

A polyacrylate emulsion and polymer technology, applied in the field of fluorine-containing polymer modified polyacrylate emulsion, can solve the problems of toxicity, poor compatibility of polyacrylic resin, etc., achieve simple production process, improve water resistance and Self-cleaning, overcoming expensive effects

Inactive Publication Date: 2006-10-11
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"Industrial Coatings" published in 2002 "the development of acrylic resin for room temperature cross-linked fluorine coatings" used resin is not water-based, fluorine resin and polyacrylic resin compatibility is not good, the solvent used in the synthesis of polyacrylic resin is Xylene, toxic

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one, (mass percentage %)

[0029] Weigh 5% polytetrafluoroethylene micropowder in 45.7% water, add 1.0% fluorocarbon emulsifier, heat to 45°C for pre-emulsification for 1 hour, then add 0.4% sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene 0.3% ether, add 15% water to the pre-emulsified polytetrafluoroethylene and pour it into a four-necked reaction flask equipped with a stirrer, a reflux condenser, and a constant temperature heating sensor, and stir for about 10 minutes. When the temperature reaches 40°C, Using the "semi-hungry drop method", first add 20% of 32% mixed monomers (including 12.8% butyl acrylate, 12.8% methyl methacrylate, and 6.0% styrene) at a rate of 1-2 drops per second. Continue heating, after the temperature reaches 70°C, add 25% of 0.3% ammonium persulfate dropwise at a rate of 4 drops per second, and continuously add 0.3% of pH regulator sodium bicarbonate, keep the temperature at 70°C, 2- The remaining mixed monomers and amm...

Embodiment 2

[0031] Weigh 3% polytetrafluoroethylene micropowder in 50% water, add 2% fluorocarbon emulsifier, heat at 50°C for pre-emulsification for 1 hour, then add 0.24% sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether 0.46%, add 13.5% water to the pre-emulsified polytetrafluoroethylene and pour it into a four-necked reaction flask equipped with a stirrer, a reflux condenser, and a constant temperature heating sensor, and stir for about 30 minutes. When the temperature reaches 50°C, use "Semi-hungry drop method", first add 10% of 33% mixed monomer (including 18% butyl acrylate, 10% methyl methacrylate, and 5% styrene) at a drop rate of 1-2 drops per second, and continue Heating, after the temperature reaches 60°C, add 22% of 0.4% ammonium persulfate dropwise at a rate of 4 drops per second, 0.4% of the pH regulator sodium bicarbonate, keep the temperature at 75°C, drop the remaining monomer and Ammonium persulfate is cooled and discharged. After the emulsion is complet...

Embodiment 3

[0033] Weigh 1% polytetrafluoroethylene micropowder in 48.5% water, add 1.5% fluorocarbon emulsifier, heat at 60°C for pre-emulsification for 1 hour, then add 0.41% sodium dodecylbenzenesulfonate, octylphenol polyoxyethylene ether 0.29%, add 17.5% water to the pre-emulsified polytetrafluoroethylene and pour it into a four-necked reaction flask equipped with a stirrer, a reflux condenser, and a constant temperature heating sensor, and stir for about 10 minutes. When the temperature reaches 40°C, use "Semi-hungry drop method", first add 15% of 30% of mixed monomer (10% of butyl acrylate, 15% of methyl methacrylate, 5% of styrene) at a rate of 1-2 drops per second, Continue heating, after the temperature reaches 50°C, drop 25% of 0.3% ammonium persulfate at a rate of 4 drops per second, and 0.3% of the pH regulator sodium bicarbonate, keep the temperature at 80°C, and drop the remaining monomers in 2 hours And ammonium persulfate, cooling discharge, after the emulsion is complete...

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Abstract

The invention relates to a fluorine-containing polymer modified polyacrylate emulsion, a preparation method thereof and an application in architectural paint processing or automobile electrophoretic paint processing. Specifically, a complex emulsifier is added to the polytetrafluoroethylene emulsion, and the mixed monomer and initiator are added dropwise in a semi-starved state, and the emulsion polymerization is carried out in the swollen helical polytetrafluoroethylene long carbon chain. The present invention overcomes that the existing organic fluorine resin is expensive, the film-forming temperature is high, and it is not convenient for construction; the fluorine monomer used in the shell-type fluorine-containing polymer emulsion is gas and poisonous at normal temperature, and the synthesis conditions are relatively high; polyacrylate The emulsion has poor water resistance and poor weather resistance. Experiments have proved that after adding fluoropolymer, the number average molecular weight and weight average molecular weight of the system are significantly reduced, water resistance and self-cleaning performance are improved, and the manufacturing process is simple, transparent and pollution-free.

Description

Technical field: [0001] The invention relates to a fluorine-containing polymer modified polyacrylate emulsion used for paint or electrophoretic paint base material and its synthesis and application. Background technique: [0002] PTFE micropowder has good thermal stability and chemical inertness, and tetrafluoroethylene monomer has perfect symmetry so that the attraction force and surface energy between PTFE micropowder molecules are low. The closely arranged fluorine atoms on the outer layer of the carbon skeleton effectively prevent the exposure of the carbon-carbon chain, making it have excellent weather resistance, high temperature resistance, self-cleaning, and chemical corrosion resistance. However, the organic fluorine resin used as coating is expensive and has a high film-forming temperature, which is not convenient for construction, which limits its application and development. In recent years, the research on water-based fluororesin emulsion has attracted much att...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/10C08F2/44C08F2/22
Inventor 王洪艳陈正霞万建华
Owner JILIN UNIV
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