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Quartz fiber/modified cyanate ester composite material as well as preparation method and application thereof

A composite material and quartz fiber technology, applied in the direction of the radiation unit cover, can solve the problems of poor heat resistance, high cross-linking density, and unsatisfactory radome, etc., and achieve the effect of strong operability and wide application prospects

Pending Publication Date: 2021-12-07
NO 20 RES INST OF CHINA ELECTRONICS TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dielectric constant (ε) and dielectric loss (tanδ) of epoxy resin are relatively large, and its heat resistance is also poor, which cannot meet the requirements of modern radomes for low dielectric, low loss, and high temperature resistance. Although cyanate resin has high mechanical strength, it also has good heat resistance, and its moisture absorption rate is lower than 1.5%.
However, due to the high cross-linking density of CE, the material is relatively brittle
Therefore, choosing epoxy resin and cyanate resin as the matrix of composite materials often has the problem of poor comprehensive performance.

Method used

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  • Quartz fiber/modified cyanate ester composite material as well as preparation method and application thereof
  • Quartz fiber/modified cyanate ester composite material as well as preparation method and application thereof
  • Quartz fiber/modified cyanate ester composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Heat 100g BADCy and 5g E-51 to 160°C, mix well, and react until the sample has no crystallization phenomenon, which is recorded as CE-EP prepolymer, wherein the mass of E-51 is 5% of the mass of BADCy;

[0042] Step 2. At 25°C, add the pretreated PSN to the prepolymer in step 1, wherein the added mass of the pretreated PSN is 2% of the prepolymer to obtain a modified cyanate, denoted as 2 -PSN / CE-EP.

[0043] The pretreated PSN was prepared according to the following method: put the original PSN into a round-bottomed flask, and use a rotary evaporator to perform rotary evaporation treatment. The conditions of the rotary evaporation treatment are: the rotation speed is 120r / min, and the temperature is 40°C. In order to remove the ammonia in the PSN, obtain the pretreated PSN.

[0044] Step 3. Add 0.01wt.% dibutyltin dilaurate to the modified cyanate, mix well to obtain a mixed solution, then add acetone to the mixed solution, the volume ratio of acetone to the mixed sol...

Embodiment 2

[0046] The method for preparing the modified cyanate is the same as in Example 1, except that in step 2, the added mass of pretreated PSN is 3% of the prepolymer. The prepared quartz fiber / modified cyanate composite material is denoted as QF / 3-PSN / CE-EP.

Embodiment 3

[0048] The method for preparing the modified cyanate is the same as that in Example 1, except that in step 2, the added mass of pretreated PSN is 4% of the prepolymer. The prepared quartz fiber / modified cyanate composite material is denoted as QF / 4-PSN / CE-EP.

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Abstract

The invention provides a quartz fiber / modified cyanate ester composite material as well as a preparation method and application thereof. The preparation method comprises the steps of heating cyanate ester resin and epoxy resin to the temperatyre of 150-160 DEG C, uniformly mixing, and reacting until a sample does not have a crystallization phenomenon to obtain a prepolymer; adding the pretreated polysilazane into the prepolymer at normal temperature or in a heating state to obtain modified cyanate ester; adding dibutyltin dilaurate into the modified cyanate ester, uniformly mixing to obtain a mixed solution, then adding acetone into the mixed solution, uniformly stirring, impregnating quartz fiber cloth, and removing a solvent at room temperature to obtain a prepreg; and cutting, curing and cooling the prepreg to obtain the quartz fiber / modified cyanate ester composite material. According to the invention, the resin matrix is modified so as to enable the resin matrix to have good dielectric property and good interface bonding property with fibers, and meanwhile, the original excellent characteristics of mechanical property, thermal property and the like are maintained, so that the comprehensive performance of the composite material is improved.

Description

technical field [0001] The invention relates to the technical field of resin-based composite materials, in particular to a quartz fiber / modified cyanate composite material and its preparation method and application. Background technique [0002] In recent years, radar communication technology has been developed rapidly, and the performance requirements for radome are gradually increasing. A radome is a key functional component that is transparent to electromagnetic waves and protects the internal radar from damage. In order to protect the normal operation of communication, guidance, telemetry and other systems of aerospace vehicles in harsh environments, and to promote the development of new high-Mach number aircraft in the direction of high-speed flight, precision guidance, long-range strikes, and terminal maneuvering, the design of high-performance radome / antenna window, Material selection and preparation become one of the bottlenecks. Specifically, whether it is the sel...

Claims

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Application Information

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IPC IPC(8): C08J5/04C08L79/04C08L83/16C08K7/10H01Q1/42
CPCH01Q1/42C08J2379/04C08J2483/16Y02T50/40
Inventor 李建伟赵文忠孔杰王一琇于震
Owner NO 20 RES INST OF CHINA ELECTRONICS TECH GRP
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