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Method for modifying epoxy resin by reaction type multi-block copolymer

A multi-block copolymer and epoxy resin technology, which is applied in the field of modified epoxy resin, can solve the problems of harsh reaction conditions, inability to form obvious microphase structure, and inability to significantly improve the performance of modified epoxy resin to achieve toughness Improve and increase the effect of interface adhesion

Inactive Publication Date: 2015-08-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the currently used block copolymers are synthesized by anionic polymerization, the reaction conditions are harsh, and a large amount of organic solvents are used
There are also patents that provide a method for in-situ polymerization to synthesize copolymer-modified epoxy resins. This method cannot form an obvious microphase structure in epoxy resins and cannot significantly improve the performance of modified epoxy resins.

Method used

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  • Method for modifying epoxy resin by reaction type multi-block copolymer
  • Method for modifying epoxy resin by reaction type multi-block copolymer
  • Method for modifying epoxy resin by reaction type multi-block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 0.08g of compatibilizer to 100g of E-44 epoxy resin, mix well, add 1.7g of styrene, heat up to 60°C, add 0.01g of azobisisobutyronitrile, start the polymerization reaction; add 3.4g after 6 hours n-butyl acrylate, after 3 hours of polymerization reaction, obtained the epoxy resin modified by reactive multi-block copolymer. The structural formula of the compatibilizer is:

[0018]

[0019] Wherein the number of units of styrene is 4, the number of units of maleic anhydride is 4, and the number average molecular weight is 1000.

[0020] The infrared spectrum of the reaction product is attached figure 1 As shown, 1730cm -1 Nearby characteristic peaks represent the generation of ester bonds, indicating that a covalent bond has been formed between the compatibilizer and bisphenol A diglycidyl ether, and the product obtained by this method has reactivity. Further carried out GPC test to this mixture, the high molecular weight part of GPC curve is as attached figur...

Embodiment 2

[0022] Add 0.53g compatibilizer to 100g E-51 epoxy resin, mix well, add 2g methyl methacrylate, heat up to 60°C, add 0.11g dicumyl peroxide, start polymerization reaction; add after 6 hours 4.30g of n-butyl acrylate, after polymerization reaction for 3 hours, obtained the epoxy resin modified by reactive multi-block copolymer. The structural formula of the compatibilizer is:

[0023]

[0024] Wherein the number of units of styrene is 4, the number of units of maleic anhydride is 4, and the number average molecular weight is 1000.

Embodiment 3

[0026] Add 0.74g compatibilizer to 100g E-51 epoxy resin, mix well, add 8.42g methyl methacrylate, heat up to 60°C, add 0.02g benzoyl peroxide, start polymerization reaction; after 8 hours 16.84g of n-butyl acrylate was added, and after 5 hours of polymerization reaction, a reactive multi-block copolymer-modified epoxy resin was obtained. The structural formula of the compatibilizer is:

[0027]

[0028] Wherein the number of units of styrene is 50, the number of units of maleic anhydride is 50, and the number average molecular weight is 10000.

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Abstract

The invention discloses a method for modifying epoxy resin by a reaction type multi-block copolymer. According to the method, the reaction type multi-block copolymer is prepared directly through polymerization in the epoxy resin and used for toughening modification of the epoxy resin. The method comprises the following steps: a compatilizer is added to the epoxy resin, the mixture is uniformly mixed, a first monomer is added, the mixture is heated to the temperature of 60 DEG C, an initiator is added, and a polymerization reaction is started; after 6-10 h, a second monomer is added, the polymerization reaction is performed for 3-5 h, a multi-block polymer is obtained, and a nanostructure is formed after a curing agent is added for curing. The epoxy resin is adopted as a place for the polymerization reaction, other solvents are not used, almost all the reactants participate in forming of a product, and the method has the characteristic of environmental protection. The generated multi-block copolymer has very good compatibility with an epoxy resin matrix and has the very good toughening effect and broad industrial prospects.

Description

technical field [0001] The invention relates to the field of modified epoxy resins, in particular to a method for modifying epoxy with a multi-block copolymer. Background technique [0002] Epoxy resins are usually cured with a curing agent, and after curing, these resins are known for their heat and chemical resistance. Cured epoxies also exhibit good mechanical properties, benefiting from a high degree of crosslinking after curing. But it is precisely because of this that they lack resilience. When the crosslink density or Tg of the resin increases, the toughness of the resin will decrease significantly. This makes the scope of application of epoxy resin very limited. [0003] Recently, there have been some studies involving the improvement of fracture resistance or toughness of epoxy resins by adding various block copolymers to epoxy resins. Much of the previous work has focused on the use of amphiphilic diblock copolymers with epoxy-miscible blocks and epoxy-immiscib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/10C08F293/00C08F220/14C08F212/08C08F220/18
Inventor 张庆华何韧詹晓力陈丰秋
Owner ZHEJIANG UNIV
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