Low-viscosity, low-exothermicity, high-strength, high-toughness epoxy resin/curing agent system for liquid infusion molding of composite material

A technology of epoxy resin and liquid infusion, applied in the field of epoxy resin, which can solve the problems of fast reaction speed, overheating of curing system, and danger caused by

Inactive Publication Date: 2015-03-25
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Curing exotherm is an important factor affecting the production and quality of large-scale composite products. If the curing exotherm is concentrated, it will cause local overheating on the one hand, resulting in uneven curing of the product, internal stress, and poor product quality. On the other hand, the entire curing system is overheated. , the reaction speed is too fast and difficult to control, which may cause the product to scorch and even cause danger

Method used

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  • Low-viscosity, low-exothermicity, high-strength, high-toughness epoxy resin/curing agent system for liquid infusion molding of composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix benzylamine and bisphenol F epoxy resin epoxy groups in a molar ratio = 1:20 in a flask, place in a constant temperature oil bath and stir at a medium speed, react at a temperature of 80-100°C for 4 hours, and prepare the prepared The amine-modified epoxy resin was collected for later use.

[0027] 100g of amine-modified epoxy resin, 5g of 1,4-butanediol glycidyl ether, 91g of hexahydrophthalic anhydride, and 0.27g of DMP-30 accelerator, stir well, vacuumize to remove air bubbles, press 90℃ / 2h+130 °C / 2h pouring and curing, the cured epoxy resin can be obtained, and the curing exothermic peak temperature and properties are listed in Table 1.

Embodiment 2

[0029] Mix benzylamine and bisphenol F epoxy resin epoxy groups in a flask at a molar ratio = 1:15, place in a constant temperature oil bath and stir at a medium speed, react at a temperature of 80-100°C for 4 hours, and prepare the prepared The amine-modified epoxy resin was collected for later use.

[0030] Amine-modified epoxy resin 100g, 1,4-butanediol glycidyl ether 5g, hexahydrophthalic anhydride and methyl hexahydrophthalic anhydride mixed acid anhydride 88g according to the mass ratio of 1:1, and DMP-30 accelerator 0.24g, stirring Evenly, vacuumize to remove air bubbles, and pour and cure at 90°C / 2h+130°C / 2h to obtain a cured epoxy resin. The curing exothermic peak temperature and properties are listed in Table 1.

Embodiment 3

[0032] Mix benzylamine and bisphenol F epoxy resin epoxy groups in a flask at a molar ratio = 1:15, place in a constant temperature oil bath and stir at a medium speed, react at a temperature of 80-100°C for 4 hours, and prepare the prepared The amine-modified epoxy resin was collected for later use.

[0033] Amine-modified epoxy resin 100g, polyethylene glycol glycidyl ether 10g, hexahydrophthalic anhydride and methyl hexahydrophthalic anhydride mixed acid anhydride 87g by mass 1:1, and DMP-30 accelerator 0.26g, stir evenly, vacuumize Remove air bubbles, that is, pour and cure at 90°C / 2h+130°C / 2h to obtain a cured epoxy resin. The peak exothermic temperature and properties of curing are listed in Table 1.

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Abstract

The invention discloses a low-viscosity, low-exothermicity, high-strength, high-toughness epoxy resin / curing agent system for liquid infusion molding of a composite material and relates to the technical field of epoxy resin. The epoxy resin / curing agent system comprises the following components in percentages by mass: 39%-65% of an epoxy resin component, 34%-60% of a curing agent component and 0.1%-1.5% of a curing accelerator component, wherein the epoxy resin component is prepared by uniformly mixing amine-modified epoxy resin and an epoxy resin active diluents; the curing agent component is acid anhydride, the curing accelerator component is a curing accelerator and the total mass of the components is 100%. The low-viscosity, low-exothermicity, high-strength, high-toughness epoxy resin / curing agent system for liquid infusion molding of a composite material has low viscosity of 100-500mPa.s at 25 DEG C, low curing exothermic peak temperature of 90-120 DEG C, tensile strength of 80-90MPa, tensile modulus of 3.2-3.4GPa and elongation at break of 4%-5% and can be used in liquid infusion molding of large-size composite material parts.

Description

technical field [0001] The invention relates to a low-viscosity, low-heat exothermic, high-performance epoxy resin / curing agent system for liquid infusion molding of composite materials, belonging to the technical field of epoxy resins. Background technique [0002] Fiber-reinforced epoxy resin composites have the advantages of high specific strength, high specific modulus, low density, stable structure size, corrosion resistance, fatigue resistance, and material properties can be designed. They have been widely used in aerospace, transportation, and wind power blade manufacturing. , chemical anticorrosion, construction engineering and sports equipment and other fields. [0003] Liquid infusion molding technology is a new process for rapid prototyping of composite materials. Liquid resin is injected into the mold with pre-laid fiber reinforced materials under the action of vacuum pressure field. At the same time, the self-crosslinking and curing reaction is completed to for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/28C08G59/42C08G59/62C08G59/14
Inventor 程珏邹齐樊孟金张军营
Owner BEIJING UNIV OF CHEM TECH
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