Preparation method of halogen-free, flame-retardant, low-smoke and low-toxin hot melt phenolic prepreg

A prepreg and toxic heat technology, which is applied in the field of composite material preparation and phenolic resin-based composite material preparation, can solve the problems of unsatisfactory application requirements, unstable resin content, and difficult control of defects, so as to improve the covering performance and process Sexuality, smoke toxicity is small, and the effect of volatile matter reduction

Active Publication Date: 2017-11-24
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wet process prepregs have disadvantages such as high volatile content, low production efficiency, unstable resin content, and serious environmental pollution. The wet process has been unable to meet the growing application requirements.
In addition, the wet process is used to produce unidirectional fiber prepreg, the production efficiency is low, and the defects of composite products are not easy to control

Method used

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  • Preparation method of halogen-free, flame-retardant, low-smoke and low-toxin hot melt phenolic prepreg

Examples

Experimental program
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Effect test

preparation example Construction

[0036] The preparation method of the epoxy resin-based composite material with controllable toughness of the present invention comprises the following steps:

[0037] (1) Raw material preparation: the resin solid content of the high-solid content phenolic resin is ≥ 93%, and the viscosity of the phenolic resin is 5000-30000cp. Freeze the colloidal phenolic resin at -18~-10°C for ≥6 hours. After taking out the frozen phenolic resin, use physical methods to crush it quickly. Preferably, the solid content of the resin is 93% to 96%.

[0038] The solid thermosetting resin is pulverized at room temperature, and the solid thermosetting resin includes phenolic resin, benzoxazine resin or phosphorus-containing epoxy resin.

[0039] (2), add the crushed high-solid content phenolic resin matrix obtained in step (1) into a reaction kettle with a temperature control device, add low-viscosity, high-activity liquid epoxy resin at the same time, stir at a low speed, and stir at a temperatur...

Embodiment 1

[0054] The solid content of synthetic phenolic resin is 95%, and its gel time of testing is 230 seconds, confirms to comprise the matrix component of following mass percent content:

[0055] Phenolic resin 92%;

[0056] Solid phenolic resin 5%

[0057] Liquid Epoxy 3%

[0058] The reinforcing fiber is: T700 carbon fiber

[0059] Step (1), taking out the colloidal phenolic resin after being stored at -15°C for 10 hours, and crushing it. The solid phenolic resin was pulverized.

[0060] Step (2), put the phenolic resin and liquid epoxy resin into a temperature-controlled reactor and stir at a low speed, stir and melt at 60°C for 1.5 hours to obtain a transparent colloid.

[0061] Step (3), adding solid phenolic resin, stirring and mixing with the phenolic resin for 20 minutes under heating at 70° C. to obtain a finished resin.

[0062] Step (4), put the finished resin mixture into the coating machine, apply the film at 50-60°C, adjust the coating speed at 6m / min, and the sp...

Embodiment 2

[0068] The solid content of synthetic phenolic resin is 96%, and its gel time of test is 170 seconds, confirms to comprise the matrix component of following mass percentage content:

[0069] Phenolic resin 95%;

[0070] Solid phosphorus epoxy resin 3%

[0071] Liquid Epoxy 2%

[0072] The reinforcing fiber is: EW200 glass fiber cloth

[0073] Step (1), after storing the colloidal phenolic resin at -15°C for 24 hours, take it out and crush it. The solid phosphorus-containing epoxy resin was pulverized.

[0074] Step (2), put the phenolic resin and liquid epoxy resin into a temperature-controlled reactor and stir at a low speed, stir and melt at 70°C for 1 hour to obtain a transparent colloid.

[0075] Step (3), adding solid phosphorus-containing epoxy resin, stirring and mixing with phenolic resin for 30 minutes under heating at 80° C., to obtain a finished resin.

[0076] Step (4), put the finished resin mixture into the film coating machine, apply the film at 45-55°C, ad...

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Abstract

The invention relates to a preparation method of halogen-free, flame-retardant, low-smoke and low-toxin hot melt phenolic prepreg. The solid content and the viscosity-temperature flow characteristic of phenolic resin are controlled with a reasonable synthesis process; solid phenolic resin and liquid epoxy resin are mixed uniformly according to formula design, and a resin system suitable for preparation of prepreg with a hot melt process is obtained; the gelation time of the resin is controlled to range from 140 s to 250 s, a hot melt resin adhesive film is prepared from the hot melt phenolic resin system, the coating temperature is controlled to range from 40 DEG C to 65 DEG C, the hot melt phenolic resin adhesive film and unidirectional fiber or fiber fabric are composited under heating and pressurizing conditions, and the hot melt prepreg is prepared. The hot prepreg with uniform texture and stable resin content can be obtained through resin synthesis, formula design and process design, and the hot melt prepreg and the composite have the characteristics of low smoke, no halogen, low smog toxin and flame retardancy and can meet requirements for use performance of interior trimming and structural composites for high-seed railways, aircrafts, steamships and other transportation tools.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a halogen-free, flame-retardant, low-smoke and low-toxicity hot-melt phenolic prepreg, and belongs to the technical field of preparation of phenolic resin-based composite materials. Background technique [0002] As one of the three major synthetic thermosetting resins, phenolic resin is the earliest synthetic resin to realize industrialization in the world. Phenolic resin is not only used in a large proportion in industry, agriculture, construction and other industries, but also in the fields of national defense, military industry and transportation. Because of its incomparable flame retardant performance, it is widely used in aircraft, high-speed rail, automobile, construction and other industries. The application of fiber-reinforced phenolic resin-based composites is gradually expanding. Taking the ever-growing field of rail transit as an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L61/06C08L63/00C08L61/34C08K7/14C08K7/06
CPCC08L61/06C08L2201/02C08L2201/10C08L2201/22C08L2205/025C08L2205/03C08L63/00C08K7/06C08K7/14C08L61/34
Inventor 栾贻浩周宇樊孟金凌辉胡亮蒋文革
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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