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Organic silicon modified epoxy acrylate aqueous dispersion and preparation method thereof

An epoxy acrylate and organosilicon technology, which is used in modified epoxy resin adhesives, epoxy resin coatings, applications, etc., can solve the problems of poor flexibility, poor water resistance, and high brittleness, and achieve the quality of the coating film. High and low application viscosity, the effect of improving flexibility

Inactive Publication Date: 2011-02-16
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of high viscosity, high brittleness, poor flexibility and poor water resistance in the prior art, and provide a UV-curable epoxy acrylate with high solid content, low viscosity, excellent mechanical properties and water resistance Aqueous dispersion and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Add 46.26g of epoxy resin E-51, 77.86g of polypropylene glycol diglycidyl ether with a number average molecular weight of 550 to 750 and 0.32g of inhibitor hydroquinone, and add it with a stirring paddle, a thermometer, and a thermostat. In the four-necked reaction flask of pressure funnel and condenser; 35.26g acrylic acid is packed in constant pressure funnel. Among them, the molar ratio of epoxy resin E-51 and epoxy group in polypropylene glycol diglycidyl ether is 1:1, and the molar ratio of carboxyl group of acrylic acid and epoxy resin compound system is 1:1. When the temperature of the system was raised to 75°C, 1.28g of catalyst tetraethylammonium bromide was added, and acrylic acid was added dropwise, and the dropwise addition was completed within 0.5h. Continue to raise the temperature to 85° C., and finish the reaction until the acid value of the system is less than 5 mgKOH / g, then lower the temperature to obtain a viscosity-reduced modified epoxy acrylat...

Embodiment 2

[0037] (1) 46.26g of epoxy resin E-51, 77.86g of polypropylene glycol diglycidyl ether with a number average molecular weight of 550 to 750 and 0.48g of inhibitor p-methoxyphenol were added with stirring paddle, thermometer, In a four-necked reaction flask with a constant pressure funnel and a condenser; 35.26 g of acrylic acid was charged into the constant pressure funnel. Among them, the molar ratio of epoxy resin E-51 and epoxy group in polypropylene glycol diglycidyl ether is 1:1, and the molar ratio of carboxyl group of acrylic acid and epoxy resin compound system is 1:1. When the temperature of the system was raised to 75° C., 0.80 g of catalyst N,N-dimethylbenzylamine was added, and acrylic acid was added dropwise, and the dropwise addition was completed within 0.5 h. Continue to raise the temperature to 85° C., the reaction ends when the acid value of the system is less than 5 mgKOH / g, and the temperature is lowered to obtain a viscosity-reduced modified epoxy acrylate...

Embodiment 3

[0043] (1) 46.26g of epoxy resin E-51, 72.47g of polyethylene glycol diglycidyl ether with a number average molecular weight of 550 to 650 and 0.31g of inhibitor p-methoxyphenol were added with stirring paddle, In the four-necked reaction flask of thermometer, constant pressure funnel and condenser; 35.26g acrylic acid is charged in constant pressure funnel. Among them, the molar ratio of epoxy resin E-51 and epoxy group in polypropylene glycol diglycidyl ether is 1:1, and the molar ratio of carboxyl group of acrylic acid and epoxy resin compound system is 1:1. When the temperature of the system was raised to 75°C, 1.23g of catalyst N,N-dimethylbenzylamine was added, and acrylic acid was added dropwise, and the dropwise addition was completed within 0.5h. Continue to raise the temperature to 85° C., the reaction ends when the acid value of the system is less than 5 mgKOH / g, and the temperature is lowered to obtain a viscosity-reduced modified epoxy acrylate prepolymer. The am...

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Abstract

The invention discloses an organic silicon modified epoxy acrylate aqueous dispersion and a preparation method thereof. The method comprises the following steps of: mixing a polyether epoxy diluent and epoxy resin, and reacting the mixture with a crylic acid monomer to obtain low-viscosity epoxy acrylate prepolymer; performing grafting modification on the low-viscosity epoxy acrylate prepolymer by using maleic anhydride and introducing a hydrophilic group on a molecular chain; mixing micro-molecular amino silicone oil and organic alkali to obtain a neutralizer; and neutralizing the system, adding water for dilution and dispersion, and regulating solid content and viscosity to obtain the UV-curable organic silicon modified epoxy acrylate aqueous dispersion. The organic silicon modified epoxy acrylate aqueous dispersion has high solid content of over 60 percent and low viscosity of between 1,500 and 5,500 mPa.s. A UV cured film has high hardness of between 4H and 6H, high flexibility and water resistance and low water absorption of below 5.0 percent, and can be applied to the fields of furniture, buildings, household appliances, papermaking and printing, and the like.

Description

technical field [0001] The invention relates to an aqueous dispersion of silicone-modified epoxy acrylate, in particular to a high-solid-content, low-viscosity UV-curable silicone-modified epoxy acrylate aqueous dispersion and a preparation method thereof. Background technique [0002] Ultraviolet (UV) curing technology is widely used in many fields such as paints, coatings, inks and adhesives because of its high efficiency, environmental protection and energy saving. With people's concern about the environment, the formulation and implementation of regulations to limit and reduce volatile organic compound (VOC) emissions, UV-curable coatings are gradually replacing traditional solvent-based coatings. The general formulation of UV-curable coatings includes photoinitiators, reactive monomers and photosensitive prepolymers, namely epoxy acrylates, urethane acrylates, acrylates (polyether or polyester) and unsaturated polyesters. Among them, epoxy acrylic resin has a wide rang...

Claims

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Application Information

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IPC IPC(8): C08G59/17C09J163/10C08G81/00C08G59/14C09D163/10C08J3/03C09D11/10C09D11/101C09D11/102
Inventor 侯有军陈尊曾幸荣任碧野刘润林朱力勇
Owner SOUTH CHINA UNIV OF TECH
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