Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method of polycarbosilane blended resin hot-melt prepreg

A polycarbosilane and prepreg technology, applied in the field of silicon carbide ceramic matrix composite material preparation, can solve the problems of inability to meet resin viscosity, complex preparation process, high ceramic yield, etc. Efficient effect

Active Publication Date: 2021-11-26
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF15 Cites 4 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

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, National Academy of Sciences) and 200g of solid polycarbosilane with a molecular weight of 1000-2000 (Suzhou Sailifei Ceramic Fiber Co., Ltd.) in 154g of n-hexane In, stir and mix evenly, remove n-hexane by vacuum distillation 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 make it completely melt 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; , the coating film temperature is 80°C, the coating film speed is 5m / min, and the mass of polycarbosilane blended resin accounts for 35% of the sum of the mass of adhesive film and release paper;

[0025] (3) When the temperature of the pressing roller of the hot-melt impregnation machine is controlled at 80°C and the impregnation spe...

Embodiment 2

[0028] (1) Dissolve 150g of liquid polycarbosilane V01 with a molecular weight of 1100-1800 (Institute of Chemistry, National Academy of Sciences) and 150g of solid polycarbosilane with a molecular weight of 1000-2000 (Suzhou Sailifei Ceramic Fiber Co., Ltd.) in 100g of n-hexane In, stir and mix evenly, remove n-hexane by vacuum distillation 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 2 hours to completely melt it to form a system with a viscosity of 3.6Pa·S, and then use a coating machine to coat a film with a thickness of 0.05mm on the release paper; Among them, the temperature of the coating film is 60°C, the speed of the coating film is 4m / min, and the mass of the polycarbosilane blended resin accounts for 35% of the sum of the mass of the adhesive film and release paper;

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

Embodiment 3

[0033] (1) Dissolve 60g of liquid polycarbosilane P01 with a molecular weight of 900-1300 (Institute of Chemistry, National Academy of Sciences) and 140g of solid polycarbosilane with a molecular weight of 1000-2000 (Suzhou Sailifei 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 make it completely melt to form a system with a viscosity of 50Pa·S, and then use a coating machine to coat a film with a thickness of 0.09mm on the release paper; , the coating film temperature is 80°C, the coating film speed is 3m / min, and the mass of polycarbosilane blended resin accounts for 40% of the sum of the mass of 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 ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

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-based composite materials. Liquid polycarbosilane and solid polycarbosilane are mixed according to the mass ratio of (3: 7)-(1: 1) to obtain a polycarbosilane mixed system with the viscosity ranging from 5*10<3> Pa.S to 3*10<5> Pa.S; firstly, the polycarbosilane mixed system is heated and melted to form a system with the viscosity ranging from 1.5 Pa.S to 50 Pa.S, release paper is coated with an adhesive film with the uniform thickness at the temperature of 60 DEG C-80 DEG C, and the mass of the adhesive film accounts for 30%-40% of the sum of the mass of the adhesive film and the mass of the release paper; and when the pressure roller temperature of the hot-melt impregnation machine is controlled to be 60-90 DEG C and the impregnation speed is controlled to be 3-6m / min, the upper and lower layers of adhesive films and the middle layer of fiber cloth are compounded together in a hot-pressing manner to obtain the polycarbosilane blended resin hot-melt prepreg. The method is simple in process, short in period, high in production efficiency and low in preparation cost, and the prepared prepreg is stable in glue content, low in volatile matter content and good in laying property.

Description

technical field [0001] 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. 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 pyrolysis (PIP), etc. 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 mainly uses po...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com