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One-step method for preparing epoxy resin with low viscosity, high strength and high toughness

An epoxy resin, high toughness technology, applied in the field of polymer materials, can solve the problems of complex operation and high energy consumption, and achieve the effect of low system viscosity

Inactive Publication Date: 2018-01-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method is prepared in two steps, and the operation is complicated
[0006] Chinese invention patent application 201410646155.2 discloses a low-viscosity, low heat release, high-strength, high-toughness epoxy resin / curing agent system for liquid infusion molding of composite materials. First, an amine-modified epoxy is prepared, and then The modified epoxy resin is cured to obtain a high-strength resin. This method is also realized by a two-step method, which is complicated to operate and consumes a lot of energy.

Method used

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  • One-step method for preparing epoxy resin with low viscosity, high strength and high toughness

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 100g of four-functional epoxy epoxy resin, 19g of epoxy octadecane, 95g of hexahydrophthalic anhydride, and 0.48g of quaternary ammonium salt are mixed in a beaker, placed in a constant temperature oil bath and stirred at a medium speed for 10min, vacuumed to remove air bubbles, that is, press 90°C / After 3h+130℃ / 3h pouring and curing, the cured epoxy resin can be obtained, and the mechanical properties are shown in Table 1.

Embodiment 2

[0029] Four functional epoxy epoxy resin 100g, 3,4-epoxycyclohexylmethyl-3,4-epoxycyclohexyl carboxylate 10g, methyl nadic anhydride 123g, and DMP-30 accelerator 2.33g mixed Place the beaker in a constant temperature oil bath and stir at a medium speed for 10 minutes, vacuumize to remove air bubbles, and then pour and solidify at 70°C / 3h+150°C / 2h to obtain a cured epoxy resin. The mechanical properties are shown in Table 1.

Embodiment 3

[0031] 100g of bisphenol F epoxy resin, 5g of glycidyl stearate, 96g of nadic acid anhydride, and 1.45g of N-diglycidyl aniline accelerator were mixed in a beaker, placed in a constant temperature oil bath and stirred at medium speed for 10min, vacuumed to remove air bubbles, That is, pour and cure at 80°C / 4h+130°C / 2h to obtain cured epoxy resin. The mechanical properties are listed in Table 1.

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Abstract

The invention discloses a one-step method for preparing epoxy resin with low viscosity, high strength and high toughness. The one-step method comprises the following step: subjecting raw materials toa curing reaction so as to prepare the epoxy resin with high strength and high toughness, wherein the raw materials comprise the following components in percentages by weight: 38 wt% to 59 wt% of matrix resin, 38 wt% to 59 wt% of a curing agent and 0.1 wt% to 3 wt% of an accelerant; the matrix resin is a mixture of epoxy resin and an active diluent; the active diluent is a weak polar epoxy compound with a side chain; the temperature of curing is 70 to 160 DEG C; and the time of curing is 3 to 8 hours. According to the invention, cured epoxy resin with high tensile strength, high tensile modulus and good toughness is prepared by the one-step method through the following steps: adding a proper amount of weak polar low-viscosity epoxy resin so as to obtain a low-viscosity epoxy resin component, then carrying out mixing with a curing agent and a curing accelerator, and carrying out a curing reaction. The one-step method provided by the invention is applicable to a variety of epoxy resins and has simple process.

Description

technical field [0001] The invention relates to the technical field of polymer materials, and more particularly relates to a one-step method for preparing low-viscosity, high-strength and high-toughness epoxy resin. 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 form a product. The liq...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G59/42C08L63/00
Inventor 程珏巴龙翰邹齐张军营
Owner BEIJING UNIV OF CHEM TECH