Self-emulsified aqueous epoxy emulsion and method for preparing same

A technology of water-based epoxy emulsion and production method, used in epoxy resin coatings, coatings and other directions

Inactive Publication Date: 2005-06-01
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the increasing importance of environmental protection, the application of solvent-based coatings is gradually limited, so the development of high-performance water-based coatings to replace solvent-based coatings has become the focus of research all over the world. However, the existing water-based epoxy systems have the above shortcomings, so they should be developed A new method to synthesize waterborne epoxy, so that the performance of waterborne epoxy can truly match the level of solvent-based epoxy coatings

Method used

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  • Self-emulsified aqueous epoxy emulsion and method for preparing same
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Examples

Experimental program
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Effect test

Embodiment 1

[0065] Embodiment 1, the synthesis of organosilicon polymerization intermediate

[0066] Silicone monomer 480Kg (among them: vinyltrimethylsilane 300Kg, octamethylcyclotetrasiloxane 180Kg), reactive emulsifier 48Kg (among them: α-allyl alkylphenol polyoxyethylene ether 6Kg, α-allyl alkylphenol polyoxyethylene ether ammonium sulfate 42Kg), crosslinking agent (allyl methacrylate) 1Kg, acrylic acid monomer 469Kg (of which: methyl methacrylate 140Kg, butyl acrylate 280Kg, acrylic acid Isooctyl ester 49Kg), initiator (dibenzoyl peroxide) 2Kg, add to the reaction pot, heat up to 55-60°C under stirring conditions, stop heating, exothermic reaction occurs in the reaction system, and the temperature rises to 65-60°C 70°C, keep the temperature at 68-70°C, and react at a constant temperature for 3 hours to obtain an organosilicon polymerization intermediate with a viscosity of 450 mPa·s and a molecular weight of 2500.

Embodiment 2

[0067] Embodiment 2, the synthesis of organosilicon polymerization intermediate

[0068] Silicone monomer 360Kg (among them: 3-propenylpropyltrimethylsilane 220Kg, octamethylcyclotetrasiloxane 140Kg), reactive emulsifier 96Kg (among them: allyl alcohol polyoxyethylene ether 16Kg, α - Allyl alkylphenol polyoxyethylene ether ammonium sulfate 80Kg), crosslinking agent (N, N-methylene 2-acrylamide) 1Kg, acrylic acid monomer 542Kg (wherein: methyl methacrylate 160Kg, butyl acrylate Ester 360Kg, isooctyl acrylate 22Kg), initiator (dicumyl peroxide) 1Kg, put into the reaction pot, heat up to 67-70°C under stirring conditions, stop heating, exothermic reaction occurs in the reaction system, the temperature Raise to 75-80°C, keep the temperature at 78-80°C, and react at constant temperature for 90 minutes to obtain an organosilicon polymerization intermediate with a viscosity of 700 mPa·s and a molecular weight of 4000.

Embodiment 3

[0069] Embodiment 3, the polymerization of aqueous epoxy emulsion

[0070] 75Kg of the organosilicon polymerization intermediate prepared in Example 1, 440Kg of epoxy resin, and 354Kg of deionized water were added to the reaction pot, and the temperature was maintained at 85-87°C. While stirring, 80Kg of acrylic acid monomer (wherein: methacrylic acid Methyl ester 16Kg, butyl acrylate 34Kg, acrylamide 5Kg and acrylic acid 25Kg), add 2Kg ammonium persulfate at the same time, keep warm and react for 30 minutes. Then add 9Kg potassium hydroxide. Promptly obtain the aqueous epoxy emulsion of the present invention. The emulsion is a milky white viscous liquid with a solid content of 51.5%, a viscosity of 8.9 Pa·s, and a molecular weight of 6.7×10 4 , the pH value is 7.

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Abstract

The present invention provides one kind of self-emulsifying water thinned epoxy emulsion and its production process. The self-emulsifying water thinned epoxy emulsion is produced through emulsion copolymerization with the polymer intermediate, which is obtained through polymerizing the mixed organosilicon monomer comprising alkenyl-containing trimethyl silane and octalkyl cyclotetrasiloxane and acrylic acid monomer, epoxy resin and acrylic acid monomer. The self-emulsifying water thinned epoxy emulsion has homogeneous particle size, high stability, and stable production process. The anticorrosive paint compounded with the self-emulsifying water thinned epoxy emulsion reaches the level of solvent type epoxy resin paint.

Description

technical field [0001] The invention relates to a self-emulsifying water-based epoxy emulsion and a production method thereof. Background technique [0002] Water-based epoxy emulsion usually refers to the emulsion, aqueous dispersion or aqueous solution formed by dispersing ordinary epoxy resin in the form of particles or colloids in the water phase. Epoxy resins cannot be directly emulsified by adding water, and must introduce hydrophilic groups into their molecular chains or add hydrophilic components to prepare water-based epoxy emulsions. Generally, there are three methods for the preparation of water-based epoxy emulsions: mechanical method, chemical modification method and phase inversion method. [0003] Compared with acrylic resin systems, epoxy resins are more difficult to form stable emulsions through mechanical emulsification. There are not many types of emulsifiers that can be successfully used to prepare epoxy emulsions. The more suitable emulsifiers are those...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/30C08F283/10C09D163/10
Inventor 江洪申陈安仁
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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