Silicon carbide fiber cloth reinforced polyimide resin base structure wave-absorbing material and preparation method thereof

A technology of polyimide resin and silicon carbide fiber is applied in the field of wave absorbing materials, which can solve the problems of low strength and no wave absorbing properties, and achieve the effects of good structural integrity, excellent molding process performance, and good mechanical properties.

Active Publication Date: 2018-07-06
QINGHAI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flexural strength of the composite material is 100-170MPa, which is low in strength and does not have wave-absorbing properties.

Method used

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  • Silicon carbide fiber cloth reinforced polyimide resin base structure wave-absorbing material and preparation method thereof

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preparation example Construction

[0026] The invention relates to a preparation method of a structural wave-absorbing material, in particular to a silicon carbide fiber cloth reinforced high-temperature-resistant polyimide resin-based structural wave-absorbing material and a preparation method thereof. The reinforcement is silicon carbide fiber cloth, the matrix is ​​polyimide resin, and the filler is nano-transition metal sulfide absorbent. Among them, the mass fraction of silicon carbide fiber cloth is 40wt% to 60wt%, the mass fraction of polyimide resin is 29.5wt% to 59.5wt%, and the mass fraction of nano absorbent is 0.5wt% to 10.5wt%. . Among them, the polyimide resin is formed by the curing of its precursor polyamic acid, the solid content of the polyamic acid used is (in N-N dimethylacetamide solvent) 20-45%, and the absorbent is nanometer Molybdenum sulfide, nano tungsten disulfide, nano molybdenum diselenide and nano tungsten diselenide or a composite of several absorbents.

[0027] The morphology o...

Embodiment 1 to Embodiment 11

[0029] The preparation method of the present invention is to mix the nano-absorbent and the polyamic acid solution uniformly, and then paint the uniformly mixed solution on the silicon carbide fiber cloth, and prepare the structural wave-absorbing composite material by hot pressing, and the structural wave-absorbing material It is composed of polyimide resin, silicon carbide fiber woven cloth and nano absorbent. Specific steps include:

[0030] Step 1. Put the silicon carbide fiber cloth cut to an appropriate size into an acetone solution for ultrasonic cleaning for 1 hour, and then put it into an oven for drying; the drying temperature is 80°C; the ultrasonic power is 100W.

[0031] Step 2. Accurately weigh the mass m1 of the silicon carbide fiber cloth with an electronic analytical balance, weigh the mass m2 of the polyamic acid solution, and weigh the mass m3 of the nano-absorbent. The nano-absorbent is mixed with the corresponding polyamic acid solution, and treated in 10...

Embodiment 12

[0042] Step 1. Put the silicon carbide fiber cloth cut to an appropriate size into an acetone solution for ultrasonic cleaning for 1 hour, and then put it into an oven for drying; the drying temperature is 80°C; the ultrasonic power is 100W.

[0043] Step 2. Accurately weigh the mass m1 of the silicon carbide fiber cloth with an electronic analytical balance, weigh the mass m2 of the polyamic acid solution, and weigh the mass m3 of the nano-absorbent. The nano-absorbent is mixed with the corresponding polyamic acid solution, and treated in 90KHz ultrasonic wave for 4 hours, so that the absorbent is uniformly dispersed in the polyamic acid solution.

[0044] Step 3. Apply the mixed solution of nano-absorbent and polyamic acid to the dried silicon carbide fiber cloth, put it into a vacuum oven, and evacuate it to remove the air bubbles in the preform. Under the condition of a vacuum degree of 0.07MPa Keep it down for 5 minutes, and then return to normal pressure. The dipped pre...

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Abstract

The invention relates to a silicon carbide fiber cloth reinforced polyimide resin base structure wave-absorbing material and a preparation method thereof. The silicon carbide fiber cloth reinforced polyimide resin base structure wave-absorbing material is prepared from the following components in percentage by mass: 40%-60% of silicon carbide fiber cloth, 29.5-59.5% of polyimide resin matrix and 0.5%-10.5% of a nano transition metal sulfide absorbent. The preparation method of the silicon carbide fiber cloth reinforced polyimide resin base structure wave-absorbing material comprises the following steps: uniformly mixing the nano transition metal sulfide absorbent with a polyamide acid solution to obtain a mixed solution; brushing the mixed solution onto the dried silicon carbide fiber cloth to remove bubbles, and performing pre-heating treatment, thereby obtaining a prefabricated part; and preserving the heat of the prefabricated part for 1-5 hours at a temperature of 350-370 DEG C, thereby obtaining the silicon carbide fiber cloth reinforced polyimide resin base structure wave-absorbing material. The obtained product is good in integrity, is strong in impact resistance, is not liable to layer, and is good in heat resistance.

Description

technical field [0001] The invention relates to the field of wave-absorbing materials, in particular to a silicon carbide fiber cloth-reinforced polyimide resin-based structure wave-absorbing material and a preparation method thereof. Background technique [0002] Absorbing materials refer to those materials that can attenuate and absorb incident electromagnetic wave energy, and convert it into heat energy for dissipation or use electromagnetic wave interference to cancel each other out. It is one of the effective ways to achieve target radar stealth. According to its molding process and mechanical bearing capacity, absorbing materials can be divided into two types: coating type (absorbing coating) and structural type. Among them, the resin-based structural absorbing material has high specific strength and specific stiffness, and can be designed easily. Strong, anti-fatigue, good corrosion resistance and simple molding process, good absorbing performance and reliability, has...

Claims

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Application Information

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IPC IPC(8): D06N3/12D06N3/00C09D179/08C09D5/32
CPCC08K3/30C09D5/32C09D179/08D06N3/0015D06N3/0063D06N3/0077D06N3/125D06N2209/04D06N2209/065D06N2209/103
Inventor 望红玉金培鹏王自洁
Owner QINGHAI UNIVERSITY
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