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Dry-process cold-drawing molded prepreg and preparation method thereof

A prepreg and cold drawing technology, applied in the field of polymer composite materials, can solve the problems of high cost, high curing temperature, and long curing time, meet the requirements of pot life, avoid the use of organic solvents, and reduce the curing temperature and the effect of curing time

Pending Publication Date: 2022-03-25
武汉本邦复合材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dry method also has the problem of insufficient pot life of prepreg or high curing temperature. How to make the prepreg fast cure at medium and low temperature through the deployment of appropriate formula and ratio to ensure that it has a long pot life, for prepreg The optimization of the impregnation production process and the improvement of efficiency are of great significance
[0005] Through the above analysis, the existing problems and defects of the prior art are: the existing prepreg formula is mainly based on the latent curing agent system of dicyandiamide, and this system has the problems of too high curing temperature and too long curing time
[0006] The difficulty of solving the above problems and defects is: the research and development of the existing formula is mainly based on the framework of dicyandiamide latent curing agent, which cannot effectively solve this problem, resulting in the current use of medium and high temperature for curing, which will greatly increase the cost required for production

Method used

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  • Dry-process cold-drawing molded prepreg and preparation method thereof
  • Dry-process cold-drawing molded prepreg and preparation method thereof
  • Dry-process cold-drawing molded prepreg and preparation method thereof

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preparation example Construction

[0048] Such as figure 1 As shown, the dry-process cold-drawn prepreg preparation method provided by the embodiment of the present invention includes:

[0049] S101, weighing liquid bisphenol A epoxy resin, solid bisphenol A epoxy resin, novolac epoxy resin, curing agent, accelerator, toughening agent in proportion;

[0050] S102, place the weighed liquid bisphenol A type epoxy resin, solid bisphenol A type epoxy resin, and novolac epoxy resin in the reaction kettle for mechanical stirring, heat up to 90°C for heat preservation, and wait for the solid bisphenol A type epoxy resin After the epoxy resin is completely dissolved, cool to 60°C and set aside;

[0051] S103, add the curing agent, accelerator, and toughening agent to the mixed resin matrix, mix it uniformly under mechanical stirring at 60°C, and then add it to the rubber tank, and evenly spread it on the release paper. After the reinforcement matrix is ​​fully impregnated, spread a layer of release paper on the surfa...

Embodiment 1

[0058] A dry-process cold-drawn prepreg is characterized in that it uses epoxy resin matrix, curing agent, accelerator and toughening agent as main raw materials, wherein the epoxy resin matrix is ​​composed of liquid bisphenol A epoxy resin and solid Bisphenol A epoxy resin and novolac epoxy resin are compounded. The curing agent is a tertiary amine substance with a terminal hydroxyethyl group. The accelerator is a metal salt accelerator. The toughening agent is a reactive group. flexible long-chain substances.

[0059] The raw materials in the prepreg and their parts by weight include: 60-80 parts of epoxy resin matrix, 30-50 parts of curing agent, 0.5-2 parts of accelerator and 5-15 parts of toughening agent.

[0060] Preferably, the raw materials in the dipping material and their parts by weight include: 60-80 parts of epoxy resin matrix, 35-45 parts of curing agent, 1-1.5 parts of accelerator, and 8-12 parts of toughening agent.

[0061] The epoxy resin matrix is ​​compo...

Embodiment 2

[0082] A dry-process cold-drawn prepreg, the preparation method of which comprises the following steps:

[0083] Get 30 parts by mass of E-51 liquid bisphenol A epoxy resin, 20 parts by mass of E-14 solid bisphenol A epoxy resin and 10 parts by mass of F-51 novolac epoxy resin and put them into the reactor for mechanical stirring, The stirring speed is 600r / min, the temperature is raised to 90°C and kept for 20mnin, and then cooled to 60°C for later use;

[0084] Get 40 parts by mass of tetrakis (2-hydroxyethyl) adipamide with a particle size of 50 μm, 1.5 parts by mass of tetramethylammonium hydroxide and 10 parts by mass of polyetheramine with a molecular weight of 2000 and add them to the prepared resin matrix. After mechanical stirring and mixing at a temperature of 60°C, add it to the rubber tank;

[0085] Keep the temperature of the heating roller set at 80°C and the temperature of the heating plate at 130°C, adjust the winding speed so that the time for the prepreg to ...

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Abstract

The invention belongs to the technical field of polymer composite materials, and discloses a dry-process cold-drawing molded prepreg and a preparation method thereof, and the dry-process cold-drawing molded prepreg comprises the following components in parts by weight: 60-80 parts of an epoxy resin matrix, 30-50 parts of a curing agent, 0.5-2 parts of an accelerant and 5-15 parts of a flexibilizer. The invention provides the dry-method cold-drawing molded prepreg, the use of an organic solvent in the preparation process of the prepreg can be avoided, meanwhile, the requirement of the working life of the prepreg is met, the curing temperature and the curing time of the prepreg are effectively reduced, and the effects of reducing the cost and improving the efficiency are achieved for the production of the prepreg. The curing temperature can be effectively reduced and the curing time can be effectively shortened on the premise of not influencing the normal / low-temperature storage stability of a resin system, so that the effects of reducing cost and improving efficiency are achieved. By adding the flexibilizer, the coiling capability of the prepreg is effectively improved. The preparation process provided by the invention is simple, convenient to operate and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of polymer composite materials, and in particular relates to a dry-process cold-drawn prepreg and a preparation method thereof. Background technique [0002] At present, prepreg refers to the composition of resin matrix and reinforcement made by impregnating continuous fiber or fabric with resin matrix under strictly controlled conditions. It is an intermediate material for manufacturing composite materials and is widely used in aerospace, wind power, electronics, etc. field. [0003] At present, most mature prepreg formulations at home and abroad use epoxy resin and latent curing agent system, among which dicyandiamide is the most used. Due to its latent curing agent characteristics, dicyandiamide is evenly dispersed in the resin system as an ultrafine powder during the prepreg preparation process, and will not participate in the curing reaction. Dicyandiamide will only dissolve when the temperature rises ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L63/02C08L63/04C08L67/04C08L77/00C08L71/00C08J5/24C08G59/50C08G59/68
CPCC08J5/24C08G59/508C08G59/5086C08G59/68C08J2363/02C08J2463/02C08J2463/04C08J2467/04C08J2477/00C08J2471/00
Inventor 彭永利万春杰祝亮蔡建国
Owner 武汉本邦复合材料科技有限公司