Unlock instant, AI-driven research and patent intelligence for your innovation.

A low-viscosity, high-yield liquid polycarbosilane and its preparation method

A polycarbosilane, high-yield technology, applied in the field of new material preparation of polycarbosilane, can solve the problems of high viscosity, low yield, difficulty in meeting the requirements of silicon carbide fiber strength and heat resistance, and achieve strength retention High, high-strength effect

Active Publication Date: 2022-01-28
江西信达航科新材料科技有限公司
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polycarbosilane still has problems such as high viscosity, insufficient spinnability, and low yield. The strength and heat resistance of silicon carbide fibers prepared by this method are still difficult to meet the requirements of use.

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

specific Embodiment 1

[0027] 1. Incorporate nano-SiO 2 Put it into a beaker, pour deionized water into it, and heat it to 60°C in a water bath and keep the temperature constant; add maleic anhydride therein and mechanically stir for 5min to dissolve the maleic anhydride; then add benzoyl peroxide (BPO) for The initiator was ultrasonically oscillated until the deionized water was volatilized; then the beaker was placed in a drying oven and dried at 60°C for 12 hours to obtain the mixed substance 1. Among them, SiO 2 , maleic anhydride, and benzoyl peroxide in a mass ratio of 100:2:2.

[0028] 2. Divinylbenzene (DVB) is placed in a three-necked flask, and mixed substance 1 is added thereto; nano-alumina powder is added thereto, and stirred for 8-12 hours, so that mixed substance 1 and nano-alumina are evenly distributed therein, and recorded For mixed substance 2. Among them, the mass ratio of DVB to mixed substance 1 and nano-alumina is: 100:5:5.

[0029] 3. Polydimethylsilane (PDMS) distillatio...

specific Embodiment 2

[0033] 1. Incorporate nano-SiO 2 Put into the beaker, pour deionized water, water bath is heated to 80 ℃ and keep temperature constant; Add maleic anhydride therein and mechanically stir 10min, make maleic anhydride dissolve; Then add benzoyl peroxide (BPO) for The initiator was ultrasonically oscillated until the deionized water was volatilized; then the beaker was placed in a drying oven and dried at 80° C. for 24 hours to obtain the mixed substance 1. Among them, SiO 2 , maleic anhydride, and benzoyl peroxide in a mass ratio of 100:10:10.

[0034] 2. Divinylbenzene (DVB) is placed in a three-necked flask, and mixed substance 1 is added thereto; nano-alumina powder is added thereto, and stirred for 12 hours, so that the mixed substance 1 and nano-alumina are evenly distributed in it, which is recorded as mixed Substance 2. Among them, the mass ratio of DVB to mixed substance 1 and nano-alumina is: 100:10:10.

[0035] 3. Polydimethylsilane (PDMS) distillation, take 105 ° ...

specific Embodiment 3

[0039] 1. Incorporate nano-SiO 2 Put into beaker, pour deionized water into, water bath is heated to 70 ℃ and keep temperature constant; Add maleic anhydride therein and mechanically stir 8min, make maleic anhydride dissolve; Then add benzoyl peroxide (BPO) for The initiator was ultrasonically oscillated until the deionized water was volatilized; then the beaker was placed in a drying oven, and dried at 70°C for 18 hours to obtain the mixed substance 1. Among them, SiO 2 , maleic anhydride, and benzoyl peroxide in a mass ratio of 100:4:6.

[0040] 2. Divinylbenzene (DVB) is placed in a three-necked flask, and mixed substance 1 is added thereto; nano-alumina powder is added thereto, and stirred for 10 hours, so that the mixed substance 1 and nano-alumina are evenly distributed in it, which is recorded as mixed Substance 2. Among them, the mass ratio of DVB to mixed substance 1 and nano-alumina is: 100:7:6.

[0041] 3. Polydimethylsilane (PDMS) distillation, take 104 ° C fra...

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

PropertyMeasurementUnit
strengthaaaaaaaaaa
strengthaaaaaaaaaa
strengthaaaaaaaaaa
Login to View More

Abstract

The invention provides a low-viscosity, high-yield liquid polycarbosilane and a preparation method thereof. The specific steps are sequentially preparing a mixed substance 1 and a mixed substance 2, reacting to obtain a crude product, and performing purification and filtration to obtain a final product. The preparation method is the first in nano-SiO 2 The surface solution method grafted maleic anhydride, the surface of maleic anhydride contains hydroxyl groups and anhydride groups, which can be combined with nano-SiO 2 The surface forms hydrogen bonds and has good binding properties; at the same time, maleic anhydride has high reactivity and stability. Under the action of peroxide free radicals, maleic anhydride is grafted to divinylbenzene in a chemical combination to achieve uniform distribution in liquid substances; the final polycarbosilane PCS is obtained with a synthesis yield of 90%. above; the yield of ceramics is more than 85%; the silicon carbide fiber thus prepared has high strength, and the strength retention rate is high under high-temperature oxidation environment.

Description

technical field [0001] The invention belongs to the field of new material preparation of polycarbosilane, in particular to a low-viscosity, high-yield liquid polycarbosilane and a preparation method thereof. Background technique [0002] Due to its ultra-high strength, modulus, and good high temperature resistance and thermal shock resistance, silicon carbide fibers have shown great application prospects in thermal structural parts in high-tech fields such as aerospace, rockets and missiles. The precursor conversion method is one of the most studied and widely used methods for preparing silicon carbide fibers. Organic precursors are transformed into inorganic silicon carbide fibers through processes such as melt spinning at high temperature, non-melting treatment, and high-temperature sintering, which have the advantages of simple process and strong designability. Among them, polycarbosilane (PCS) is one of the most commonly used precursor materials. Polycarbosilane has th...

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 Patents(China)
IPC IPC(8): C08G77/60D01F9/10
CPCC08G77/60D01F9/10
Inventor 吴宝林侯振华吴迪
Owner 江西信达航科新材料科技有限公司