Ablation-resistant organosilicon composite, and preparation method and application thereof

An organosilicon and composite technology, applied in cables, insulated conductors, conductors, etc., can solve the problems of elasticity, strength, elongation at break mechanical properties not improved, complex preparation process, complex raw materials, etc., and achieve ceramic yield. Increase, high pyrolysis temperature, good ablation resistance

Active Publication Date: 2015-06-24
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polysilazane is brittle and has poor elongation
[0004] Chinese patent CN103725179A discloses a preparation method of a silicone ablation-resistant coating material, which uses high-elastic polyurethane modified epoxy silicone resin as the base material, and adds fillers, reinforcing agents, heat-insulating materials, additives and solvents , the prepared silicone ablation-resistant coating has high tensile strength and elongation at break, excellent ablation rate and heat insulation performance; Complex process
However, although the material prepared in this invention has better ablation resistance, its mechanical properties such as elasticity, strength, and elongation at break have not been improved.

Method used

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  • Ablation-resistant organosilicon composite, and preparation method and application thereof
  • Ablation-resistant organosilicon composite, and preparation method and application thereof
  • Ablation-resistant organosilicon composite, and preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Raw material component formula: 100 parts of PMPS and PSN with a mass ratio of 4:1 as the base rubber, 30 parts of fumed silica TS530, and 2 parts of bis-2,5 vulcanizing agent to prepare SNR-1. The preparation steps are as follows:

[0065] Weigh 40.0g of PMPS, 10.0g of PSN and put them together on the open mixer for mixing, and slowly add 15.0g of fumed silica TS530 at the same time; stop for 20 minutes after mixing evenly; add 1.0g of bis-2,5 vulcanizing agent, and mix evenly Finally, remove the silica gel and place it on a flat vulcanizer for 25 minutes at 150°C. The resulting product number was SNR-1.

[0066] The tensile strength of the prepared product is 8.1MPa, and the elongation at break is 357%. Under the protection of high-purity argon atmosphere, the speed is raised to 800°C at a rate of 10°C / min. The initial degradation temperature is 524°C, and the ceramic yield is 59.26 %. Taking the national military GJB323A-96 as the standard, the mass ablation rate ...

Embodiment 2

[0071] Raw material component formula: 100 parts of PMPS and PSN with a mass ratio of 3:1 as the base rubber, 30 parts of fumed silica TS530, and 2 parts of bis-2,5 to prepare SNR-2. The preparation steps are as follows:

[0072] Weigh 30.0g PMPS, 10.0g PSN and put them together on the open mixer for mixing, at the same time slowly add 12.0g fumed silica (TS-530); stop for 20 minutes after mixing evenly; add 0.8g bis-2,5 vulcanizing agent After mixing evenly, remove the silica gel and place it on a flat vulcanizer for 25 minutes at 150°C. The resulting product number was SNR-2.

[0073] The tensile strength of the prepared product is 8.2MPa, and the elongation at break is 360%. When it is heated from room temperature to 800°C at a rate of 10°C / min and stays for 1hr for cracking, the initial degradation temperature of the co-cured product is 535°C. Ceramic products The rate is 67.74%. Taking the national military GJB323A-96 as the standard, the mass ablation rate of the samp...

Embodiment 3

[0076] Raw material composition formula: 100 parts of PMPS and PSN with a mass ratio of 3:1 as the base rubber, 30 parts of fumed silica TS530, and 2 parts of chloroplatinic acid catalyst to prepare SNR-3. The preparation steps are as follows:

[0077] Weigh 30.0gPMPS, 10.0gPSN and put them together on the open mill for mixing, and slowly add 12.0g fumed silica (TS-530); 20 minutes after mixing evenly; add 0.8g chloroplatinic acid, and mix evenly , Remove the silica gel and place it on a flat vulcanizer for 25 minutes at 150°C. The resulting product number was SNR-3.

[0078] The tensile strength of the prepared product is 7.6MPa, and the elongation at break is 363%. When it is heated from room temperature to 800°C at a speed of 10°C / min and stays for 1hr for cracking, the initial degradation temperature of the co-cured product is 535°C. Ceramic products The rate is 65.99%. Taking the national military GJB323A-96 as the standard, the mass ablation rate of the sample after a...

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Abstract

The invention discloses an ablation-resistant organosilicon composite, and a preparation method and application thereof. The composite is a co-cured system of vinyl polymethylphenylsiloxane and silicic hydrovinyl polysilazane, and a silicic hydrogen addition or peroxide vulcanization system is adopted for vulcanization to obtain vulcanized rubber. The invention also discloses a preparation method and application of the composite. The ablation-resistant organosilicon composite has the characteristics of high high-temperature ceramic yield and favorable ablation resistance, and can be used for preparing heat insulating layers and fire-resisting cables of engines and the like.

Description

technical field [0001] The invention relates to an ablation-resistant organic silicon compound, a preparation method and application thereof, and belongs to the field of organic silicon materials. Background technique [0002] Polysiloxane has a —Si—O— chain as the main chain, and its silicon atoms can be connected with organic side groups such as methyl, vinyl, and phenyl, so the molecular chain is a polymer elastic material with both inorganic and organic properties. The Si—O bond energy (372kJ / mol) on the main chain of the molecule is much higher than the C—C bond energy (242kJ / mol), so silicone polymers are much more stable to heat and oxygen than ordinary organic polymers, especially Excellent performance at high and low temperatures. In addition, polysiloxane can be cracked into Si-O-C ceramics in an inert atmosphere. It has excellent mechanical properties and high temperature resistance that cannot be compared and replaced by other organic polymer materials. It has a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/16C08J3/24C08K3/36C08K5/00C08K5/14H01B7/295
Inventor 周传健张惠周凯运张晨赵士贵陈国文
Owner SHANDONG UNIV
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