Method for preparing polyurethane-polyacrylic ester microemulsion

A polyacrylate and microemulsion technology, applied in the field of polymer chemistry, can solve the problems of difficult process control, easy gelation, and low cost, and achieve the effects of reducing VOC content, protecting the environment, and saving costs

Inactive Publication Date: 2010-02-03
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process uses less or no organic solvents, and the cost is low, but sometimes the process is difficult to control, and gels are prone to occur in the dispersion and emulsion polymerization stages

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Add 8 parts of poly(hexanediol adipate) to the drying reactor in parts by mass and degas it in vacuum at 120°C for 2 hours, then pass nitrogen into it, and cool down to 70°C;

[0026] 2) Add 23 parts of methyl methacrylate and 13 parts of hexamethylene diisocyanate (HDI) to poly(hexanediol adipate) successively at 70°C, and react for 1 hour;

[0027] 3) Add 3 parts of N-methyldiethanolamine and 0.005 parts of dibutyltin dilaurate to it, and continue the reaction at 70° C. for 1 hour;

[0028] 4) After cooling the system temperature to 50°C, add 5 parts of dimethyl sulfate, 100 parts of water and 0.5 parts of unsaturated ethylenic monomer hydroxyethyl methacrylate for half an hour, then raise the temperature to 70°C, and finally add 0.5 parts of hydrogen peroxide, continue to keep warm and react for 8 hours until the reaction is completed without the smell of acrylate monomers, and a yellow translucent polyurethane-polyacrylate microemulsion is obtained.

Embodiment 2

[0030] 1) Add 15 parts of polybutylene adipate to the drying reactor in parts by mass and degas it under vacuum at 115°C for 1 hour, then pass nitrogen into it, and cool down to 60°C;

[0031] 2) Add 17 parts of methyl acrylate and 18 parts of isophorone diisocyanate (IPDI) to polybutylene adipate successively at 60°C, and react for 2 hours;

[0032] 3) Add 5 parts of N-methyldiethanolamine and 0.008 parts of dibutyltin diacetate to it, and continue the reaction at 60° C. for 3 hours;

[0033] 4) Then cool the system temperature to 30°C, then add 3 parts of 1mol / l hydrochloric acid, 230 parts of water and 4 parts of unsaturated ethylenic monomer hydroxyethyl acrylate for half an hour, then raise the temperature to 90°C, and finally add 2 100% water-soluble azo initiator, continue the heat preservation reaction for 5 hours until the reaction is completed without the smell of acrylate monomers, and a yellow translucent polyurethane-polyacrylate microemulsion is obtained.

Embodiment 3

[0035] 1) Add 23 parts of polyethylene adipate to the drying reactor in parts by mass and degas it in vacuum at 118°C for 1.5 hours, then pass in nitrogen and cool down to 50°C;

[0036] 2) Add 8 parts of ethyl acrylate and 6 parts of toluene diisocyanate (TDI) to polyethylene adipate in turn at 50°C, and react for 4 hours;

[0037] 3) Add 8 parts of N-methyldiethanolamine and 0.02 parts of stannous octoate to it, and continue the reaction at 50° C. for 4 hours;

[0038]4) After cooling the system temperature to 20°C, add 8 parts of or anhydrous acetic acid, 360 parts of water and 8 parts of unsaturated ethylenic monomer hydroxypropyl acrylate for half an hour, then raise the temperature to 60°C, and finally add 4 parts hydrogen peroxide, and continue to keep warm for 3 hours until the reaction is completed without the smell of acrylate monomers, and a yellow translucent polyurethane-polyacrylate microemulsion is obtained.

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PUM

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Abstract

The invention discloses a method for preparing cation-type polyurethane-polyacrylic ester microemulsion which is organic-solvent-free and emulsifier-free. The method substitutes inert vinyl monomers for organic cosolvent used during the conventional polyurethane preparation, for purpose of obtaining polyurethane prepolymer by polymerizing isocyanate and polymer polyalcohol; then after temperaturereduction, neutralization and water dispersion, functional monomers with an appropriate amount are introduced; and then the polymerization of the vinyl monomers is further initiated under the action of water-soluble azo initiator so as to obtain the cation-type solvent-free polyurethane-polyacrylic ester compound microemulsion. The method completely eliminates the organic cosolvent added in conventional waterborne polyurethane, thereby achieving the true environment-friendliness. In the preparation process no emulsifier needs to be added; obtained product grains realize nanometer-level particle size and good performance; and through formula adjustment, the obtained product grains can be used both for waterbone coatings but also in the adhesive field.

Description

technical field [0001] The invention belongs to the field of polymer chemistry, and in particular relates to a preparation method of polyurethane-polyacrylate microemulsion. Background technique [0002] Polyurethane-acrylate composite emulsion has excellent low temperature resistance, wear resistance and corrosion resistance of polyurethane, and excellent mechanical properties, weather resistance and water resistance of polyacrylate. It has been used in coatings, adhesives, etc. It has been widely used in many fields. [0003] The research on polyurethane-acrylate composite emulsion began in the early 1980s. The preparation methods of polyurethane-acrylate composite emulsion mainly include blending method and copolymerization method. Blending methods include physical blending and chemical blending. The polyurethane-acrylate composite emulsion prepared by the physical blending method has poor compatibility due to a certain degree of phase separation between the colloidal ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/00C08G18/83C08G18/12
Inventor 王海花李小瑞费贵强沈一丁牟静
Owner SHAANXI UNIV OF SCI & TECH
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