Epoxy resin composition for prepreg, preparation method thereof, and the prepreg

A technology of epoxy resin and solid epoxy resin, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problem of narrow process window, short minimum viscosity retention time and insufficient mechanical properties of prepreg And other issues

Active Publication Date: 2017-06-27
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problems of the prior art, the minimum viscosity retention time is short, the prepreg preparation process window is narrow and the mechanical properties are insufficient, the present invention provides a minimum viscosity retention time is long, the gelation time and the process time window are greatly extended, and The prepared prepreg has no lack of glue phenomenon, perfect performance, epoxy resin composition for prepreg with excellent mechanical properties and preparation method thereof

Method used

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  • Epoxy resin composition for prepreg, preparation method thereof, and the prepreg

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preparation example Construction

[0028] A preparation method of epoxy resin composition for prepreg, the method comprises mixing solid epoxy resin and toughening agent to obtain component A, curing liquid epoxy resin, dicyandiamide curing agent and imidazole The agent and the urea accelerator are mixed to prepare the B component, and then the B component is mixed with the A component to prepare the epoxy resin composition.

[0029] The specific preparation method of component B: Weigh an appropriate amount of liquid epoxy resin, and pour an appropriate amount of epoxy curing-promoting composite system powder into the liquid epoxy resin, and use mechanical stirring at room temperature to disperse the powder evenly in liquid epoxy resin. The stirring speed is preferably lower than 10rmp / min, and the stirring time is 20min. Then, the three-roll mill is equipped with cooling circulating water, and the stirred system is poured into the three-roll mill for grinding. After grinding once, the required abrasive is p...

Embodiment 1

[0036] The composition and weight percentage of epoxy resin for prepreg described in this example are as follows: solid epoxy resin E12: 35%, toughening agent 860820-S: 25%, liquid epoxy resin E51: 25%, (dicyandiamide Amine curing agent: imidazole curing agent: urea accelerator = 1:2:1.5): 15%. 100 parts by weight of dicyandiamide curing agent, imidazole curing agent and urea accelerator are the basis, wherein the imidazole curing agent is the LC-80d curing agent product of Catalysts company, and the consumption is 44.45 parts, and the particle diameter is 500nm; The cyanamide curing agent is dicyandiamide produced by Jinan Tianyou Chemical Co., Ltd., with a particle size of 20 μm; the urea accelerator is N-p-chlorophenyl N', N'-dimethylurea, selected from the new code N-p-chlorophenyl N',N'-dimethylurea from Chemical Materials (Shanghai) Co., Ltd.

[0037] The production process is as follows: ① solid epoxy resin and toughening agent are melted at 90°C and mechanically stirr...

Embodiment 2

[0039] The composition and weight percent of epoxy resin for prepreg described in this embodiment are as follows:

[0040] Solid epoxy resin E12: 35%, toughening agent 860820-S: 25%, liquid epoxy resin E51: 25%, anatase titanium dioxide (molecular formula TiO2): 3%, (dicyandiamide curing agent: LC- 80d: N-p-chlorophenyl N', N'-dimethylurea=1:3:1.5): 12%, 100 parts by weight of dicyandiamide curing agent, imidazole curing agent and urea accelerator As a benchmark, wherein the imidazole curing agent is Catalysts company LC-80d curing agent product, the dosage is 54.55 parts, and the particle size is 700nm; the dicyandiamide curing agent is dicyandiamide produced by Jinan Tianyou Chemical Co., Ltd. 50 μm; the urea accelerator is N-p-chlorophenyl N', N'-dimethylurea, selected from N-p-chlorophenyl N', N' of Xindian Chemical Materials (Shanghai) Co., Ltd. - Dimethylurea.

[0041] The production process is as follows: ① Solid epoxy resin, toughening agent and anatase titanium diox...

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Abstract

The invention provides an epoxy resin composition for a prepreg, a preparation method thereof, and the prepreg. The epoxy resin composition includes a component A and a component B, wherein the component A comprises solid epoxy resin and a toughening agent, and the component B includes liquid epoxy resin, a dicyandiamide curing agent, an imidazole curing agent, and a urea-type accelerant. The weight ratio of the dicyandiamide curing agent, the imidazole curing agent to the urea-type accelerant is 1:2:1.5-1:7.5:1.5. The epoxy resin composition effectively increases minium viscosity retention time and improves gelatinization time, so that process time window is greatly prolonged. The prepreg is free of glue starvation and has perfect performances and excellent mechanical performances. The preparation method has simple processes and is easy to carry out.

Description

technical field [0001] The invention relates to an epoxy resin composition for prepreg, its preparation method and prepreg. Background technique [0002] Epoxy resin has the advantages of excellent physical, mechanical and electrical insulation properties, adhesion, corrosion resistance, easy processing and molding, and low cost. It is widely used in electronic appliances, aerospace, construction, machinery, transportation and other fields. [0003] The preparation of epoxy resin for prepreg is to use curing agent to compound epoxy resin, and carry out mechanical stirring to prepare a target epoxy resin with a certain viscosity that can be cured at a certain temperature. The target epoxy resin can be coated on the glass fiber bundles, so that the glass fiber bundles are soaked in the resin, so as to prepare the required prepreg products, so it has a wide range of applications in automobiles, ships and airplanes. [0004] The prior art discloses a hybrid curing system, where...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/00C08G59/50C08G59/68B32B27/04B32B27/38
CPCB32B5/26B32B2260/021B32B2260/046C08G59/504C08G59/5073C08G59/686C08L63/00C08L2205/025
Inventor 张颖唐富兰黎宪宽周维
Owner BYD CO LTD
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