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A kind of preparation method of polycarbosilane blend resin hot-melt prepreg

A polycarbosilane and prepreg technology, which is applied in the field of silicon carbide ceramic matrix composite material preparation, can solve the problems of unsatisfactory resin viscosity, complicated preparation process, high ceramic yield, etc., achieve short cycle time, simplify process steps, and produce high efficiency effect

Active Publication Date: 2022-06-21
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, epoxy and phenolic resins are widely used in the preparation of hot-melt prepregs. However, epoxy and phenolic resins need to be added with curing agents, accelerators, etc. in the prepreg system. The preparation process is complicated and the preparation cost is relatively high. high
The polycarbosilane produced at home and abroad is mainly an impregnating agent suitable for the production of composite materials by the PIP process. Interrante Laboratory in the United States invented and prepared a liquid polycarbosilane resin by Grignard coupling and lithium aluminum hydride reduction by StarFire System. For related patents, see US2004 / 0063984A1, US2004 / 0138046A1, etc. This polycarbosilane has high ceramic yield and low viscosity characteristics, which cannot meet the resin viscosity of polycarbosilane prepreg prepared by hot melt method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Dissolve 134g of liquid polycarbosilane P01 with a molecular weight of 900-1300 (Institute of Chemistry, Chinese Academy of Sciences) and 200g of solid polycarbosilane with a molecular weight of 1000-2000 (Suzhou Sailife Ceramic Fiber Co., Ltd.) in 154g of n-hexane After stirring and mixing evenly, the n-hexane was removed by distillation under reduced pressure to obtain a viscosity of 1×10 5 Pa·S polycarbosilane mixed system;

[0024] (2) First, heat the polycarbosilane mixed system at 110°C for 2 hours to completely melt it to form a system with a viscosity of 5Pa·S, and then use a coating machine to coat a film with a thickness of 0.05mm on the release paper; wherein , the coating temperature is 80°C, the coating speed is 5m / min, and the mass of polycarbosilane blend resin accounts for 35% of the sum of the mass of the adhesive film and release paper;

[0025] (3) When the temperature of the pressing roller of the hot melt impregnation machine is controlled at 8...

Embodiment 2

[0028] (1) Dissolve 150g of liquid polycarbosilane V01 with a molecular weight of 1100-1800 (Institute of Chemistry, Chinese Academy of Sciences) and 150g of solid polycarbosilane with a molecular weight of 1000-2000 (Suzhou Sailife Ceramic Fiber Co., Ltd.) in 100g of n-hexane After stirring and mixing evenly, the n-hexane was removed by distillation under reduced pressure to obtain a viscosity of 1×10 4 Pa·S polycarbosilane mixed system;

[0029] (2) First, heat the polycarbosilane mixed system at 95°C for 2h to completely melt it to form a system with a viscosity of 3.6Pa·S, and then use a coating machine to coat the release paper with a film with a thickness of 0.05mm; Among them, the coating temperature is 60℃, the coating speed is 4m / min, and the mass of the polycarbosilane blend resin accounts for 35% of the sum of the mass of the adhesive film and the release paper;

[0030] (3) When the temperature of the pressing roller of the hot-melt impregnation machine is control...

Embodiment 3

[0033] (1) Dissolve 60g of liquid polycarbosilane P01 with a molecular weight of 900-1300 (Institute of Chemistry, Chinese Academy of Sciences) and 140g of solid polycarbosilane with a molecular weight of 1000-2000 (Suzhou Sailife Ceramic Fiber Co., Ltd.) in 100g of tetrahydrofuran , stir and mix evenly, remove tetrahydrofuran by vacuum distillation, and obtain a viscosity of 3 × 10 5 Pa·S polycarbosilane mixed system;

[0034] (2) First, heat the polycarbosilane mixed system at 120°C for 3 hours to completely melt it to form a system with a viscosity of 50 Pa·S, and then use a coating machine to coat a film with a thickness of 0.09 mm on the release paper; wherein , the coating temperature is 80°C, the coating speed is 3m / min, and the mass of the polycarbosilane blend resin accounts for 40% of the sum of the mass of the adhesive film and release paper;

[0035] (3) When the temperature of the pressing roller of the hot-melt impregnation machine is controlled at 90 °C and the...

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Abstract

The invention relates to a method for preparing a polycarbosilane blended resin hot-melt prepreg, and belongs to the technical field of preparing silicon carbide ceramic matrix composite materials. Mix liquid polycarbosilane and solid polycarbosilane in a mass ratio of (3:7) to (1:1) to obtain a viscosity of 5×10 3 Pa·S~3×10 5 Pa·S polycarbosilane mixed system; first heat and melt the polycarbosilane mixed system to form a system with a viscosity of 1.5Pa·S~50Pa·S, and then coat it on the release paper at 60℃~80℃ to form a uniform thickness The quality of the adhesive film accounts for 30% to 40% of the total mass of the adhesive film and release paper; the temperature of the pressing roller of the hot melt impregnation machine is controlled at 60°C to 90°C and the impregnation speed is controlled at 3m / min to 6m / min, the upper and lower layers of adhesive film and the middle layer of fiber cloth are hot-compressed and combined to obtain a polycarbosilane blend resin hot-melt prepreg. The method of the invention has the advantages of simple process, short cycle time, high production efficiency and low preparation cost, and the prepared prepreg has stable glue content, low volatile matter content and good covering performance.

Description

technical field [0001] The invention relates to a preparation method of a polycarbosilane blended resin hot-melt prepreg, and belongs to the technical field of preparation of silicon carbide ceramic matrix composite materials. Background technique [0002] Silicon carbide (SiC) ceramic matrix composites have the advantages of good high temperature resistance, high hardness, high toughness, corrosion resistance, oxidation resistance, etc., and are widely used in aerospace, automobile manufacturing, machinery and chemical production and other fields. At present, the preparation methods of silicon carbide (SiC) ceramic matrix composites generally include hot pressing sintering (HP), chemical vapor infiltration (CVI), reactive infiltration (RMI), precursor impregnation and pyrolysis (PIP) and so on. Due to the low processing temperature and simple processing equipment required by PIP, it is currently the most commonly used method for preparing SiC ceramic matrix composites. PIP...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/16C08K7/14C08K7/06C08K7/10C08J5/24
CPCC08J5/24C08J2383/16C08J2483/16C08K7/14C08K7/06C08K7/10
Inventor 张中伟苏耿班梓发庞旭段昊志杨玉平
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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