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Epoxy resin composition as well as preparation method and application thereof

A technology of epoxy resin and composition, which is applied in the field of high-toughness epoxy resin composition and its preparation, which can solve the problems of high molecular weight of toughened particles, limitation of resin toughness and interfacial properties of composite materials, reinforcement, etc., and achieve low temperature resistance Improved impact performance, optimized overall performance, and improved toughness

Active Publication Date: 2022-07-29
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The published patent CN103881301A discloses an epoxy resin composition using polymethylphenylsiloxane synergistically toughened and modified pultruded composite materials, which significantly improves the impact toughness of the cured epoxy resin. However, the polymethylphenylsiloxane used in this patent The molecular structure of methylphenylsiloxane has no active groups such as epoxy groups or amine groups, so it is difficult to significantly improve its compatibility with epoxy resins and the interfacial properties of epoxy resins and composite materials
[0006] The published patent CN107955333A discloses a kind of reinforced and toughened epoxy resin composition prepared by using polysiloxane hybrid cross-linked polymer colloidal particles. The anhydride groups on the surface of the colloidal particles can participate in the epoxy curing reaction and have good Interfacial binding force, the toughening particle has a relatively large molecular weight, so the addition amount is low (0.5-7wt%), which limits its enhancement of resin toughness and interfacial properties of composite materials

Method used

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  • Epoxy resin composition as well as preparation method and application thereof
  • Epoxy resin composition as well as preparation method and application thereof
  • Epoxy resin composition as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) TEOS tetraethyl orthosilicate, react with tetramethyldisiloxane under acidic conditions (PH=2) at 40°C for 2h under the condition of molar ratio (1:4) to obtain hydrogen-containing M units The end-capped Q-type intermediate is then subjected to a chain extension reaction with octamethylcyclotetrasiloxane (D4) in the presence of 60% sulfuric acid (the amount is 1 wt% of the Q-type intermediate) at a temperature of 50 °C. 4h, the molar ratio of Q-type intermediate and D4 was controlled to be 1:4, to obtain a branched polydimethylsiloxane intermediate with a certain degree of polymerization, and then add allyl glycidyl ether, allyl glycidyl The molar ratio of ether to intermediate is 4:1, and the reaction is carried out at room temperature for 4 hours to prepare a tetrafunctional epoxy-terminated branched polysiloxane with structure A (n=4);

[0048] from the attached figure 1 illustrate: figure 1 Medium 910cm -1 is the absorption peak of epoxy group, 790cm -1 is t...

Embodiment 2

[0055] (1) TEOS tetraethyl orthosilicate, reacted with tetramethyldisiloxane under acidic conditions (PH=2) at 60 °C for 3h under the condition of molar ratio (1:3), to obtain hydrogen-containing M unit sealed end Q-type intermediate, and then in the presence of 60% sulfuric acid (the amount is 2wt% of the Q-type intermediate), at a temperature of 50 ℃, and then with octamethylcyclotetrasiloxane (D4), carry out chain extension reaction ( 6h), control the molar ratio of Q-type intermediate to D4 to be 1:12 to obtain a branched polydimethylsiloxane intermediate with a certain degree of polymerization, and then add allyl glycidyl ether, allyl glycidyl The molar ratio of glycerol ether and the intermediate is 6:1, and the reaction is carried out for 4 hours. After purification, the A-structure tetrafunctional epoxy-terminated branched polysiloxane (n=12) is prepared;

[0056] Preparation of epoxy resin components: epoxy resin E51 (55wt%), bisphenol F type epoxy resin DER 354 (30wt...

Embodiment 3

[0061] (1) TEOS tetraethyl orthosilicate, reacted with tetramethyldisiloxane under acidic conditions (PH=2) at 60°C for 4h under the condition of molar ratio (1:2) to obtain hydrogen-containing M unit seal end Q-type intermediate, and then in the presence of 60% sulfuric acid (the amount is 1 wt% of the Q-type intermediate), at a temperature of 50 ° C, and then with octamethylcyclotetrasiloxane (D4), carry out chain extension reaction ( 6h), the molar ratio of Q-type intermediate and D4 is controlled to be 1:20 to obtain a branched polydimethylsiloxane intermediate with a certain degree of polymerization, and then allyl glycidyl ether is added, and allyl glycidyl is added. The molar ratio of glycerol ether and the intermediate is 4:1, and the reaction is carried out for 4 hours. After purification, the A-structure tetrafunctional epoxy-terminated branched polysiloxane (n=20) is prepared;

[0062] Preparation of epoxy resin components: epoxy resin E51 (50wt%), bisphenol F type ...

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Abstract

The invention discloses an epoxy resin composition as well as a preparation method and application thereof. The epoxy resin composition comprises an epoxy resin component and an amine curing agent component, at least a modifier tetrafunctional epoxy-terminated branched polydimethylsiloxane is added into the epoxy resin component, the addition amount of the modifier tetrafunctional epoxy-terminated branched polydimethylsiloxane is 1-10 wt% of the epoxy resin component, a modifier tetrafunctional amino-terminated branched polydimethylsiloxane is added into the amine curing agent component, and the addition amount of the modifier tetrafunctional epoxy-terminated branched polydimethylsiloxane is 1-10 wt% of the epoxy resin component. And the addition amount of the additive is 1-5wt% of the curing agent component. According to the prepared epoxy resin composition, the toughness and the low-temperature impact performance are remarkably improved, meanwhile, the interface bonding force between an epoxy matrix and a fiber reinforcement in the composite material can be remarkably improved through the two structural modifiers, and therefore the liquid forming composite material with excellent comprehensive performance such as toughness, low-temperature resistance, strength and heat resistance can be prepared.

Description

technical field [0001] The invention belongs to the field of epoxy resin composite materials, and particularly relates to a high-toughness epoxy resin composition for ultra-low temperature resistant composite materials and a preparation method and application thereof. Background technique [0002] Epoxy resin is widely used in the resin matrix of high-performance composite materials due to its excellent mechanical properties, heat resistance, chemical resistance and easy molding and processing. However, epoxy resin has high curing crosslinking density, high brittleness, low fracture toughness and impact toughness, especially weak low temperature resistance, so in the field of high-performance composite materials, especially in the application environment with strict requirements on toughness and damage tolerance , For example, in the fields of composite materials such as aerospace and low temperature resistant storage tanks, the application of epoxy resin is limited, and it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08L83/06C08L83/08C08G77/38C08G77/388
CPCC08L63/00C08G77/38C08G77/388C08L2205/02C08L2205/03C08L2201/08C08L83/06C08L83/08
Inventor 刘大伟刘赵兴张春俞涛杨洗李晶
Owner WANHUA CHEM GRP CO LTD