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Hot-melt phenolic resin, prepreg, composite material and preparation method

A technology of phenolic resin and composite materials, which is applied in the field of composite materials and preparation, hot-melt phenolic resins, and prepregs. It can solve the problems of low volatile content, reduce the density of composite materials and heat conduction, etc. High temperature mechanical properties and good surface quality

Active Publication Date: 2022-03-08
北京玻钢院复合材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem solved by the present invention is to provide a hot-melt phenolic resin, prepreg, composite material and preparation method, and improve the high-temperature mechanical properties of the composite material by changing the hot-melt phenolic resin catalyst system and raw material ratio; Adding hollow microspheres reduces the density and heat conduction of the composite material; and the prepreg resin content control accuracy of the prepreg prepared by the hot melt method is high, the volatile content is low, and there is no problem of environmental pollution.

Method used

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  • Hot-melt phenolic resin, prepreg, composite material and preparation method
  • Hot-melt phenolic resin, prepreg, composite material and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The preparation method of the composite material of the present embodiment comprises the following steps:

[0039] (1) The preparation of hot-melt phenolic resin comprises the following steps:

[0040] S1. Put the melted phenol into the reaction kettle, add formaldehyde under stirring condition, keep the temperature of the reaction kettle at 32°C, add ammonia water in 2-3 times, and carry out condensation reaction at 80°C, phenol, formaldehyde, ammonia water The molar ratio is 1:1.4:0.01, and the reaction time is 120min;

[0041] S2. Pump the filtrate obtained from the condensation reaction in step S1 into the reaction kettle, start stirring, heat up, and start vacuum dehydration; when the temperature of the filtrate rises to 50-60°C, it enters the low-temperature azeotropic dehydration stage, and the corresponding vacuum degree is 0.08 MPa-0.085 MPa; when a large amount of water is released, the temperature begins to rise, and the dehydration temperature of the final ...

Embodiment 2

[0058] The preparation method of the composite material of the present embodiment comprises the following steps:

[0059] (1) The preparation of hot-melt phenolic resin comprises the following steps:

[0060] S1. Put the melted phenol into the reaction kettle, add formaldehyde under stirring condition, keep the temperature of the reaction kettle at 30°C, add ammonia water in 2-3 times, and carry out condensation reaction at 80°C, phenol, formaldehyde, ammonia water The molar ratio is 1:1.23:0.02, and the reaction time is 120min;

[0061] S2. Pump the filtrate obtained from the condensation reaction in step S1 into the reaction kettle, start stirring, heat up, and start vacuum dehydration; when the temperature of the filtrate rises to 50-60°C, it enters the low-temperature azeotropic dehydration stage, and the corresponding vacuum degree is 0.08 MPa-0.085 MPa; when a large amount of water is released, the temperature begins to rise, and the dehydration temperature of the final...

Embodiment 3

[0071] The rest of the steps and the preparation of raw materials for the composite material in this comparative example are the same as those in Example 2. The difference is that in step S3, the refractive index at the end of the reaction is 1.6250, and the dehydration is completed when the gel time is 58s at (150±1)°C. Obtain the hot-melt phenolic resin.

[0072] The properties of the composite materials obtained in Examples 2 and 3 are shown in Table 2.

[0073] Table 2

[0074]

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Abstract

The invention provides a hot-melt phenolic resin, a prepreg, a composite material and a preparation method of the hot-melt phenolic resin, the hot-melt phenolic resin is prepared from phenol, aldehyde and a catalyst, the catalyst is ammonia water, and the molar ratio of the phenol to the aldehyde to the catalyst is 1: (1.13-1.54): (0.01-0.02). The high-temperature mechanical property of the composite material is improved by changing a hot-melt phenolic resin catalyst system and a raw material ratio; hollow microspheres are added into a phenolic resin matrix, so that the density and heat conduction of the composite material are reduced; and the prepreg prepared by the hot melting method has the advantages of high resin content control precision, low volatile component content and no environmental pollution problem.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a hot-melt phenolic resin, a prepreg, a composite material and a preparation method. Background technique [0002] When a space vehicle re-enters / enters the atmosphere, severe aerodynamic heating will be generated. The thermal protection system is one of the key subsystems that must be relied upon to ensure the normal operation of the electronic components inside the aircraft and the manned space, and the heat-resistant material is the thermal protection system. A vital part, its effectiveness is related to the success or failure of the flight and even the safety of life. Since the beginning of the 21st century, along with the gradual development of the national aerospace industry, ablative heat-resistant materials are facing an urgent need for weight reduction. Represented by the honeycomb reinforced low-density material system, two representative low-den...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G8/10C08J5/24C08L61/10C08L81/06C08K7/24C08K7/10
CPCC08G8/10C08J5/24C08J2361/10C08J2481/06C08K7/24C08K7/10
Inventor 张晶祁涛刘晶温鹏郭志婧宋寒姚璐璐
Owner 北京玻钢院复合材料有限公司
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