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Method for preparing organosilicon/acrylate double modified aqueous polyurethane

A technology of water-based polyurethane and acrylate, applied in the direction of coating, etc., to achieve the effect of easy promotion and application, simple process and improved tensile strength

Inactive Publication Date: 2010-06-16
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to aim at the shortcomings of current polyurethane coatings, and to provide a method for preparing organic silicon / acrylate double-modified waterborne polyurethane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The first step, the process of preparing polyurethane prepolymer: put 0.05mol polyester polyol (M=1000) and 0.02mol dimethylol propionic acid at 120°C for 30min under reduced pressure, then add 0.112mol after cooling down to 80°C Toluene diisocyanate and an appropriate amount of catalyst dibutyltin dilaurate were reacted for 2.5 hours, and 0.015mol of dimethylol propionic acid dissolved in N-methylpyrrolidone was added again, and the reaction was continued for 2.5 hours to obtain polyurethane prepolymer I; Add 0.01 mol of hydroxyethyl methacrylate containing a polymerization inhibitor hydroquinone dropwise to the polyurethane prepolymer I for reaction, keep the temperature at 60-70° C. for 2 hours, and obtain the polyurethane prepolymer II containing double bonds. During the whole process, the dehydrated diluent acetone is added to adjust the viscosity. The mass of the polymerization inhibitor hydroquinone accounts for 1 / 10,000 of the mass of hydroxy methacrylate.

[0...

Embodiment 2

[0026] The first step, the process of preparing polyurethane prepolymer: put 0.05mol of polyoxypropylene diol (M=2000) and 0.01mol of dimethylol propionic acid at 120°C for 30min under reduced pressure, then add 0.12 mol of toluene diisocyanate and an appropriate amount of catalyst dibutyltin dilaurate, react for 2.5h, add 0.024mol of dimethylol propionic acid dissolved in N-methylpyrrolidone again, and continue to react for 2.5h to obtain polyurethane prepolymer I ; Add 0.005 mol of hydroxyethyl methacrylate containing a polymerization inhibitor hydroquinone dropwise to the polyurethane prepolymer I for reaction, keep the temperature at 60-70° C. for 2 hours, and obtain the polyurethane prepolymer II containing double bonds. During the whole process, the dehydrated diluent acetone is added to adjust the viscosity. The mass of the polymerization inhibitor hydroquinone accounts for 1 / 10,000 of the mass of hydroxy methacrylate.

[0027] The second step is the process of prepari...

Embodiment 3

[0030] The first step, the process of preparing polyurethane prepolymer: put 0.05mol of polyester diol (M=2000) and 0.015mol of dimethylolpropionic acid at 120°C for 30 minutes under reduced pressure, then add 0.117°C after cooling down to 80°C mol of toluene diisocyanate and an appropriate amount of catalyst dibutyltin dilaurate, react for 2.5h, add 0.02mol of dimethylol propionic acid dissolved in N-methylpyrrolidone again, and continue to react for 2.5h to obtain polyurethane prepolymer I ; Add 0.008 mol of hydroxyethyl methacrylate containing a polymerization inhibitor hydroquinone dropwise to the polyurethane prepolymer I for reaction, keep the temperature at 60-70°C for 2.5 hours, and obtain the polyurethane prepolymer II containing double bonds . During the whole process, the dehydrated diluent acetone is added to adjust the viscosity. The mass of the polymerization inhibitor hydroquinone accounts for 1 / 10,000 of the mass of hydroxy methacrylate.

[0031] The second s...

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Abstract

The invention relates to a method for preparing organosilicon / acrylate double modified aqueous polyurethane, which comprises the following steps: carrying out a reaction on isocyanate, polyhydric alcohol and dimethylolpropionic acid to obtain polyurethane prepolymer I; dropwise adding dimethylolpropionic acid into the polyurethane prepolymer I, and dropwise adding hydroxyethyl methacrylate containing a polymerization inhibitor into the polyurethane prepolymer I, thereby obtaining polyurethane prepolymer II containing double bonds; dropwise adding organosilane into the polyurethane prepolymer II to obtain silane-modified polyurethane; adding triethylamine into the silane-modified polyurethane to carry out salification reaction, adding deionized water, and stirring to obtain organosilicon-modified aqueous polyurethane emulsion; and finally, adding methyl methacrylate and butyl acrylate into the organosilicon-modified aqueous polyurethane emulsion to carry out emulsion polymerization, thereby obtaining the organosilicon / acrylate double modified aqueous polyurethane. The method has the advantages of convenient operation and simple technique; and the prepared polyurethane chain segment contains silane and acrylate and has the advantages of favorable water resistance and mechanical properties.

Description

Technical field: [0001] The invention relates to a preparation method of silicone / acrylate double-modified waterborne polyurethane, which belongs to the technical field of preparation of waterborne and urethane coatings. Background technique: [0002] Waterborne polyurethane coatings refer to coatings formed by dissolving or dispersing polyurethane in water. In the past ten years, the pressure of public opinion to protect the earth's environment has increased day by day, and people's awareness of environmental protection has continued to increase. Some developed countries have formulated fire regulations and solvent regulations. These factors have promoted the development of water-based polyurethane materials. Waterborne polyurethane uses water as the basic medium, has the advantages of non-combustibility, low odor, no pollution to the environment, energy saving, convenient operation and processing, etc., and has been valued by people. [0003] However, water-based polyuret...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08G18/67C08G18/66C08G18/38C08G18/34C08G18/12C09D151/08
Inventor 杨霞李玉刚岳金彩郑世清周艳丽
Owner QINGDAO UNIV OF SCI & TECH
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