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A kind of waterborne epoxy resin and preparation method thereof

A water-based epoxy resin and epoxy resin technology, applied in epoxy resin coatings, coatings, etc., can solve the problems of increasing the VOC content of the water-based system, affecting the physical and mechanical properties of the cured product, and complicated chemical modification methods. Excellent self-emulsifying effect, concentrated emulsion particle size distribution, and good centrifugal stability

Active Publication Date: 2020-12-15
瑞奇(广东)技术有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The external emulsifier method needs to introduce an emulsifier into the whole system, and the emulsifier remains in the final cured product, which will affect the physical and mechanical properties of the cured product; the chemical modification method is complicated to operate and the cost is high; The emulsifier method is simple, but there are problems such as incomplete resin emulsification, large dispersed particle size, and poor storage stability.
A certain amount of co-solvent is often added to the existing water-based epoxy resin to reduce the viscosity and improve the stability of the emulsion, but at the same time it will also increase the VOC content of the water-based system, and many ionic water-based resins have poor film toughness and storage Poor stability and other issues are difficult to meet the growing actual demand

Method used

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  • A kind of waterborne epoxy resin and preparation method thereof
  • A kind of waterborne epoxy resin and preparation method thereof

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preparation example Construction

[0019] A preparation method of water-based epoxy resin, comprising the following steps: first reacting polyether amine and monoepoxide to prepare an intermediate, and then condensing the intermediate and epoxy resin to obtain the water-based epoxy resin.

[0020] Preferably, a method for preparing a water-based epoxy resin comprises the following steps: first mix polyetheramine and monoepoxide, react at 45-55°C for 2-3 hours to obtain an intermediate, and then add the intermediate dropwise to the ring In epoxy resin, react at 80-110°C for 2-4 hours after the dropwise addition to obtain water-based epoxy resin.

[0021] Preferably, the polyetheramine is polyetheramine D230, the structural formula is x≈2.5.

[0022] Preferably, the monoepoxide is at least one of allyl glycidyl ether and glycidyl methacrylate.

[0023] Preferably, the epoxy resin is bisphenol A epoxy resin.

[0024] Further preferably, the epoxy resin is compounded by epoxy resin E-51 and epoxy resin E-20 acc...

Embodiment 1

[0030] First mix 23g of polyetheramine D230 and 11.4g of allyl glycidyl ether, raise the temperature to 50°C, and react at a constant temperature for 2 hours to obtain an intermediate, then mix 59.5g of epoxy resin E-51 and 25.5g of epoxy resin E-20 Mix and heat up to 80°C. After the epoxy resin is completely melted, add 15g of the intermediate dropwise. After the intermediate is added dropwise, react at a constant temperature for 2 hours to obtain a water-based epoxy resin.

Embodiment 2

[0032] First mix 23g of polyetheramine D230 and 11.8g of glycidyl methacrylate, raise the temperature to 50°C, and react at constant temperature for 2.5h to obtain the intermediate, then mix 60g of epoxy resin E-51 and 27g of epoxy resin E-20 , the temperature was raised to 90°C, and after the epoxy resin was completely melted, 10 g of the intermediate was added dropwise. After the intermediate was added dropwise, the mixture was reacted at a constant temperature for 3 hours to obtain a water-based epoxy resin.

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Abstract

The invention discloses a waterborne epoxy resin and a preparation method thereof. The preparation method comprises the following steps: firstly, polyether amine is reacted with a monoepoxy compound to prepare an intermediate, and then the intermediate is condensed with epoxy resin to obtain the waterborne epoxy resin. The waterborne epoxy resin has no volatile matter, no solvent addition, moderate viscosity, simple preparation method and wide application range, an emulsion prepared by the waterborne epoxy resin has good storage stability and small emulsion particle size, and a paint film prepared by mixing the emulsion and a curing agent has good toughness.

Description

technical field [0001] The invention relates to a water-based epoxy resin and a preparation method thereof. Background technique [0002] Epoxy resins are widely used in coatings, adhesives, composite materials and many other fields because of their excellent physical and chemical properties. Most of the traditional epoxy resin coatings are insoluble in water and have a high viscosity. During construction, a large amount of organic solvents need to be added for dilution, which will cause harm to the ecological environment and the health of construction workers. In the past ten years, the application fields of water-based epoxy resins have become wider and wider, and oil-based epoxy resins have been replaced in some fields. As people pay more and more attention to environmental protection, water-based epoxy coatings are likely to eventually completely replace solvents. Type epoxy coating. Since the performance of waterborne epoxy resin plays a decisive role in the overall p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/50C09D163/00
CPCC08G59/502C09D163/00
Inventor 陈小双
Owner 瑞奇(广东)技术有限公司