Preparation method of waterborne epoxy emulsion

A water-based epoxy emulsion and epoxy technology, applied in the field of functional polymer materials, can solve the problems of poor acid resistance of water-based epoxy coatings, poor stability of water-based epoxy coatings, and high temperature curing, and achieve excellent emulsion stability and easy operation. , the effect of low raw material cost and energy consumption

Inactive Publication Date: 2019-01-15
江苏宏源机电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The water-based epoxy coating prepared by this method has poor acid resistance, and the application period is too short, only 80 minutes, and the curing time is 4 hours
Chinese patent application CN105754073A discloses a preparation and curing method of water-based epoxy resin, but the obtained water-based epoxy coating has poor stability and needs high temperature curing

Method used

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  • Preparation method of waterborne epoxy emulsion

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A kind of preparation method of self-emulsifying aqueous epoxy emulsion, specifically comprises the steps:

[0029] (1) Under the protection of nitrogen gas atmosphere, epoxy resin E51 (epoxy value 0.55mol / 100g, selected from Jiangsu Sanmu Chemical Co., Ltd.) and ethylene glycol butyl ether are added to the reactor, and the addition of ethylene glycol butyl ether The amount is 5mL / g of the mass volume ratio of epoxy resin, then heat the reactor to 55°C and stir at 650r / min until uniformly mixed;

[0030] (2) Slowly add phosphoric acid to the reaction vessel in step (1), the molar ratio of phosphoric acid to epoxy resin is 1:1, control the reaction temperature to 85°C after the drop, and measure the epoxy value of the system after 6 hours of reaction , until the epoxy value no longer changes, the phosphate ester type epoxy resin is obtained;

[0031] (3) Add diethanolamine slowly to the phosphate ester type epoxy resin system obtained in step (2), cool the temperature t...

Embodiment 2

[0034] A kind of preparation method of self-emulsifying aqueous epoxy emulsion, specifically comprises the steps:

[0035] (1) Under the protection of nitrogen gas atmosphere, epoxy resin E51 (epoxy value 0.50mol / 100g, selected from Jiangsu Sanmu Chemical Co., Ltd.) and propylene glycol methyl ether are added to the reactor, and the addition of propylene glycol methyl ether is epoxy The resin mass volume ratio is 3mL / g, then heat the reactor to 50°C, and stir at 600r / min until the mixture is uniform;

[0036] (2) Slowly add phosphoric acid to the reaction vessel in step (1), the molar ratio of phosphoric acid to epoxy resin is 1.1:1, control the reaction temperature to 90°C after the drop is over, and measure the epoxy value of the system after 5 hours of reaction , until the epoxy value no longer changes, the phosphate ester type epoxy resin is obtained;

[0037] (3) In the phosphate ester type epoxy resin system obtained in step (2), slowly add dimethylaminopropylamine, the...

Embodiment 3

[0040] A kind of preparation method of self-emulsifying aqueous epoxy emulsion, specifically comprises the steps:

[0041] (1) Under the protection of nitrogen gas atmosphere, epoxy resin E44 (epoxy value 0.35mol / 100g, selected from Jiangsu Sanmu Chemical Co., Ltd.) and propylene glycol methyl ether are added to the reactor, and the addition of propylene glycol methyl ether is epoxy The mass volume ratio of the resin is 8mL / g, then heat the reactor to 60°C and stir at 600r / min until the mixture is uniform;

[0042] (2) Slowly add phosphoric acid to the reaction vessel of step (1), the molar ratio of phosphoric acid to epoxy resin is 1.2:1, control the reaction temperature to be 80°C after the drop is completed, and measure the epoxy value of the system after 8 hours of reaction , until the epoxy value no longer changes, the phosphate ester type epoxy resin is obtained;

[0043] (3) Add diethanolamine slowly to the phosphate ester type epoxy resin system obtained in step (2), ...

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Abstract

The invention belongs to the field of functional polymer materials, and specifically relates to a preparation method of a waterborne epoxy emulsion. The method comprises the following steps: (1) heating one or more epoxy resins and dissolving in a cosolvent; (2) adding phosphoric acid, carrying out a reaction with epoxy resin, and carrying out an open-loop chain extension reaction; (3) adding oneor more alkali compounds, neutralizing resin, and introducing water-borne groups; and (4) adding a large amount of water slowly, and thus obtaining the waterborne epoxy emulsion by phase inversion. According to the preparation method of the self-emulsifying waterborne epoxy emulsion, the emulsion has good stability and can be stored for a long term because the epoxy resin is subjected to direct modification and reversed phase emulsification to form the emulsion; the prepared waterborne epoxy emulsion has good flexibility and high glossiness; the preparation method has the advantages of simplepreparation process, easy operation, high efficiency, low raw material cost, low energy consumption, and environmental protection, and is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the field of functional polymer materials, and in particular relates to a preparation method of water-based epoxy emulsion. Background technique [0002] Due to its excellent adhesion, mechanical strength, stability, chemical corrosion resistance, insulation and other characteristics, epoxy resin is widely used in many civil and military fields such as automobiles, ships, transportation, electric power, energy, food, etc., especially It has great development prospects in the application of coatings. However, because epoxy resin is insoluble in water, traditional epoxy coatings use organic solvents as solvents, resulting in the emission of volatile organic compounds during production and use, which pollutes the environment and poses a threat to human health. Restrictions on the volatile organic content (VOC) of paints have caused major changes in epoxy resin paints. Among them, there are two more common alternatives to traditi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08G59/14C08L63/00
CPCC08G59/1422C08J3/03C08J2363/00
Inventor 廖立谢红伟
Owner 江苏宏源机电科技有限公司
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