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High silica cloth reinforced polytetrafluoroethylene composite material and preparation method and application thereof

A technology of polytetrafluoroethylene and high-silica cloth, which is applied in the field of special materials, can solve the problems of low mechanical strength, large dielectric constant and loss, and complicated preparation process of composite materials, so as to improve mechanical properties and reduce dielectric Constant and loss, the effect of simplifying the preparation process

Pending Publication Date: 2021-11-19
北京玻钢院复合材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The object of the present invention is to provide a kind of high silica cloth reinforced polytetrafluoroethylene composite material, its preparation method and application, through the design of high silica cloth reinforced polytetrafluoroethylene composite material to solve the existing problems existing in the prior art The radome is made of glass fiber reinforced polytetrafluoroethylene composite material, and the pre-impregnated cloth is prepared by the method of Duolun impregnation, which has a long preparation cycle; the preparation process of cold pressing and sintering is used in the molding process, and the preparation process is complicated, time-consuming and labor-intensive; and The mechanical strength of the composite material is low, the "black heart" appears inside the product, and the technical problems of the dielectric constant and loss are too large

Method used

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preparation example Construction

[0028] The invention provides a method for preparing a high-silica cloth-reinforced polytetrafluoroethylene composite material, comprising the following preparation steps:

[0029] S1) Under vacuum conditions, impregnate the high-silica cloth in the polytetrafluoroethylene dispersion with a solid content of 35%-61%; dry after impregnation, and repeat the above process for 1-5 times; impregnate the polytetrafluoroethylene The high-silica cloth of fluoroethylene dispersion is tiled, and the polytetrafluoroethylene dispersion with a solid content of 35%-61% is brushed on the high-silica cloth impregnated with polytetrafluoroethylene dispersion by brushing process , after painting, dry at 130-220°C for 30-120min to obtain prepreg;

[0030] S2) heat-treating the prepreg at 280-320° C. for 30-120 minutes to obtain a high-silica reinforced polytetrafluoroethylene prepreg;

[0031] S3) Cut the high-silica cloth-reinforced PTFE prepreg fabric, lay it on the mold, and mold it at 180-37...

Embodiment 1

[0047] Sample 1 preparation:

[0048] High silica cloth is used as the reinforcing material, the fabric structure is plain weave, and the thickness is 0.26mm;

[0049] 101) Under vacuum conditions, the pressure in the tank is ≤ -0.07MPa, impregnate the high-silicone cloth in the polytetrafluoroethylene dispersion with a solid content of 40%, after soaking for 20 minutes, dry it at 130°C for 30 minutes, and then dry it at 190°C Dry for 60 minutes, dry at 220°C for 60 minutes, repeat the above process once; spread the high-silica cloth impregnated with PTFE dispersion liquid, and use the brushing process to disperse PTFE with a solid content of 60%. The solution is painted on the high-silica cloth impregnated with polytetrafluoroethylene dispersion, and after painting, it is dried at 130°C for 30 minutes, at 190°C for 60 minutes, and at 220°C for 60 minutes to obtain the mass fraction of polytetrafluoroethylene 60% prepreg;

[0050] Weigh the polytetrafluoroethylene dispersion...

Embodiment 2

[0060] Sample 2 preparation:

[0061] 101) Under vacuum conditions, the pressure in the tank is ≤ -0.07MPa, impregnate the high-silicone cloth in the polytetrafluoroethylene dispersion with a solid content of 40%, after soaking for 20 minutes, dry it at 130°C for 30 minutes, and then dry it at 190°C Dry for 60 minutes, dry at 220°C for 60 minutes, repeat the above process once; spread the high-silica cloth impregnated with PTFE dispersion liquid, and use the brushing process to disperse PTFE with a solid content of 60%. The solution is painted on the high-silica cloth impregnated with polytetrafluoroethylene dispersion, and after painting, it is dried at 130°C for 30 minutes, at 190°C for 60 minutes, and at 220°C for 60 minutes to obtain the mass fraction of polytetrafluoroethylene 50% prepreg;

[0062] Weigh the polytetrafluoroethylene dispersion with a mass fraction of 60%, and calculate the weighed weight according to the formula (1). After weighing, brush all of it on the...

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Abstract

The invention relates to a high silica cloth reinforced polytetrafluoroethylene composite material and a preparation method and application thereof. The preparation method of the high silica cloth reinforced polytetrafluoroethylene composite material comprises the following preparation steps of under a vacuum condition, immersing high silica cloth in polytetrafluoroethylene dispersion liquid with a solid content of 35%-61%; conducting drying after dipping, flatly laying the high silica cloth dipped with the polytetrafluoroethylene dispersion liquid, brushing the polytetrafluoroethylene dispersion liquid with the solid content of 35%-61% on the high silica cloth dipped with the polytetrafluoroethylene dispersion liquid, and conducting drying after brushing to obtain prepreg cloth; carrying out heat treatment on the prepreg cloth to obtain high silica cloth reinforced polytetrafluoroethylene prepreg cloth; and cutting the high-silica cloth reinforced polytetrafluoroethylene prepreg cloth, laying the cut high-silica cloth reinforced polytetrafluoroethylene prepreg cloth in a mold, and carrying out compression molding at 180-375 DEG C and 2-20 MPa to obtain the high silica cloth reinforced polytetrafluoroethylene prepreg cloth composite material. The obtained high silica cloth reinforced polytetrafluoroethylene composite material has the advantages of good mechanical properties, no shoddy problem, low dielectric constant and low loss.

Description

technical field [0001] The invention relates to the technical field of special materials, in particular to a high-silica cloth-reinforced polytetrafluoroethylene composite material, its preparation method and application. Background technique [0002] The main function of the radome is to ensure the necessary aerodynamic shape during the high-speed flight of the missile, withstand the aerodynamic heating and various loads during the flight, and reduce the impact of the flight environment on the electronic equipment inside the radome. At the same time, the radome must have good electromagnetic wave transmission characteristics. [0003] Research shows that the existing radome is made of glass fiber reinforced PTFE composite material, and the pre-impregnation method is used to prepare the pre-impregnated cloth, which has a long preparation cycle; the preparation process of cold pressing and sintering is used in the molding process, which is complicated and consumes Time-consu...

Claims

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Application Information

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IPC IPC(8): B29C70/46B29C70/54B29L31/34
Inventor 肖沅谕李松石广兴沙晓涵高龙飞武元娥何志华
Owner 北京玻钢院复合材料有限公司
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