Preparation method of PBO fiber composite material with high-temperature dielectric property

A technology of fiber composite materials and dielectric properties, which is applied in fiber types, fiber processing, textiles and papermaking, etc., can solve the problems of PBO fiber interface performance and poor high temperature resistance, and achieve improved interface properties and good dielectric properties. Effect

Inactive Publication Date: 2018-10-02
HARBIN INST OF TECH
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of preparation method of PBO fiber composite material with high temperature dielectric property in order to solve the problem of existing PBO fiber interface performance and high temperature resistance poor, this method is to carry out surface activation and roughening treatment to PBO fiber, Then, the hyperbranched polyb

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  • Preparation method of PBO fiber composite material with high-temperature dielectric property
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  • Preparation method of PBO fiber composite material with high-temperature dielectric property

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specific Embodiment approach 1

[0023] Specific embodiment one: what this embodiment records is a kind of preparation method of high temperature dielectric performance PBO fiber composite material, described method comprises the following steps:

[0024] Step 1: Preparation of grafting liquid: put the homemade hyperbranched PBO polymer and polyphosphoric acid in a 500 mL three-necked bottle at a mass ratio of 1:125 to 150, and use an electric stirrer under a nitrogen atmosphere at 100 Stir at a speed of ~500 r / min to completely dissolve it to make a grafting liquid; the electric stirrer is the DJ1C booster electric stirrer produced by Jintan Dadi;

[0025] Step 2: Infiltration treatment of PBO fibers: Take 10-20 m of laboratory-made and cleaned PBO fibers to make PBO fiber bundles, tie both ends with polytetrafluoroethylene tapes, and place the PBO fiber bundles on the PBO fiber bundles prepared in step 1. In the grafting liquid, conduct ultrasound to fully infiltrate the PBO fiber bundles with the grafting ...

specific Embodiment approach 2

[0029] Embodiment 2: In Embodiment 1, a method for preparing a PBO fiber composite material with high-temperature dielectric properties, in step 1, the electric stirring time is 4-6 h, and the stirring temperature is 110-160°C.

specific Embodiment approach 3

[0030] Embodiment 3: In the method for preparing a high-temperature dielectric PBO fiber composite material described in Embodiment 1, in step 2, the ultrasonic time is 5-10 min, and the ultrasonic power is 120 W.

[0031] Embodiment 4: In the method for preparing a high-temperature dielectric PBO fiber composite material described in Embodiment 1, in step 3, the heating temperature in the water bath is 80-90 °C, and the time is 1-2 h.

[0032] Specific embodiment five: the preparation method of a kind of high-temperature dielectric performance PBO fiber composite material described in specific embodiment one, in step four, described Co 60 The dose of γ-ray irradiation was 30-40 kGy, and the irradiation time was 15-20 h.

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Abstract

The invention discloses a preparation method of a PBO fiber composite material with a high-temperature dielectric property, aims at improving the interfacial force of the composite material on the basis of guaranteeing excellent dielectric property of the PBO fiber cyanate ester composite material, and solves the problems that PBO fiber is smooth in surface and the bonding strength between the surface of the PBO fiber and a resin interface is low. The preparation method comprises the following steps: firstly, preparing a hyperbranched PBO polymer grafting solution; secondly, performing infiltration treatment on a PBO fiber bundle; thirdly, performing deacidification treatment on the PBO fiber bundle; fourthly, performing irradiation grafting treatment on the PBO fiber bundle; fifthly, preparing the PBO fiber cyanate ester composite material. The method has the advantages that the surface of the PBO fiber is grafted with hyperbranched PBO polymer through a Co60 gamma ray irradiation method, the interface bonding strength of the PBO fiber cyanate ester composite material is enhanced, the increased range of the interface strength is 32 to 45.65 percent, the formed PBO fiber cyanate ester composite material has excellent dielectric property, and the method is beneficial to the preparation of structure and function integrated wave-transmitting composite materials.

Description

technical field [0001] The invention belongs to the technical field of PBO fiber composite material preparation, and in particular relates to a preparation method of a PBO fiber composite material with high-temperature dielectric properties. Background technique [0002] Aerospace vehicles need to fly in a high-temperature environment above 300 °C, which puts forward higher requirements on the high-temperature performance of aircraft radome materials. It is particularly important to prepare structural-functional composite materials in the field of antenna systems. However, good high-temperature dielectric properties are based on stable and strong structural properties. Although PBO fiber has excellent high temperature resistance and dielectric properties, the lack of active groups and roughness on the surface leads to weak interfacial bonding performance, and its composite material performance, especially high temperature performance, is not ideal, which limits the use of P...

Claims

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Application Information

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IPC IPC(8): C08L79/04D06M10/10D06M10/06D06M101/30
CPCC08L79/04C08L2201/08C08L2205/025D06M10/06D06M10/10D06M2101/30
Inventor 张春华王娟赵蕾曹莹莹张麒
Owner HARBIN INST OF TECH
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