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A kind of organosilicon-boron ceramic precursor and its preparation method and application

A ceramic precursor, organic technology, applied in the direction of silicon-organic compounds, etc., can solve the problem of heat resistance, tracking resistance, and deterioration of mechanical properties and processing properties of addition-type liquid silicone rubber that have not been found in silicone-boron ceramic precursors. , poor compatibility of silicone rubber, etc., to facilitate large-scale production, improve heat resistance and arc ablation resistance, and not easy to hydrolyze.

Active Publication Date: 2017-12-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of inorganic fillers as modifiers not only has a large amount of addition, but also has poor compatibility with silicone rubber, and deteriorates the mechanical properties and processing properties of addition-type liquid silicone rubber.
However, there is no research report on the heat resistance and tracking resistance of silicone rubber based on organosilicon‐boron ceramic precursors.

Method used

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  • A kind of organosilicon-boron ceramic precursor and its preparation method and application
  • A kind of organosilicon-boron ceramic precursor and its preparation method and application
  • A kind of organosilicon-boron ceramic precursor and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Add 6.7g of octamethylcyclotetrasiloxane (D4), 3.1g of methyltrimethoxysilane (MTMS) and 2.1g of boric acid (BA) into a four-necked 250mL flask equipped with mechanical stirring and a serpentine reflux tube, Then measure 10 mL of diethylene glycol dimethyl ether and add 0.1 g of concentrated sulfuric acid dropwise, pour it into a flask, raise the temperature to 30°C and stir for 15 minutes, then raise the temperature to 80°C, keep the temperature for 2 hours, then raise the temperature to 150°C, and react for 2 hours. Finally, the reaction system was cooled to normal temperature until excess boric acid was precipitated. After the reaction, the reaction system was transferred to a centrifuge tube, centrifuged at a rotation speed of 10,000 r / min for 10 min, and the liquid was separated. Subsequently, distilled under reduced pressure at 100°C until there was no droplet in the recovery bottle to obtain a gel-like product, cooled to 50°C, then added 40 mL of n-hexane to mech...

Embodiment 2

[0050] According to the method and process in Example 1, the difference is that the amount of BA is increased to 3.5g to prepare Si-BOCP-2 and apply it to the addition-type liquid silicone rubber. Compared with Comparative Example 1, Si-BOCP-2 improved the thermal stability of silicone rubber, and compared with Example 1, the initial decomposition temperature increased from 433.7°C to 438.4°C, and the heat-resistant modification effect was slightly better than that of Si-BOCP-2. For BOCP-1, the initial tracking time is extended to 3130s.

Embodiment 3

[0052] According to the method and process in Example 2, the amount of D4 and MTMS used remained unchanged, and the amount of BA was increased to 4.9g to prepare Si-BOCP-3, which was applied to the addition-type liquid silicone rubber. It can be seen from Table 2 that with the further increase in the amount of boric acid, the heat resistance modification effect of Si-BOCP-3 decreased compared with Si-BOCP-2, but compared with the comparative example, the addition of Si-BOCP- The heat resistance of the silicone rubber of 3 is still higher than that of the blank silicone rubber, in which the initial thermal decomposition temperature increases from 406.6°C to 427.5°C, and the initial tracking time also increases from 960s to 3250s.

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Abstract

The invention discloses an organosilicon-boron ceramic precursor, a preparation method and application thereof. The preparation method is to stir cyclotetrasiloxane, trifunctional siloxane and boric acid at 25-35°C for 10-20 minutes under the action of an acid catalyst, then heat up to 80-100°C for polycondensation reaction, and finally heat up Continue the reaction at 120-150°C, and obtain the organosilicon-boron ceramic precursor after post-treatment. The ceramic precursor prepared by the present invention has controllable boron content, high thermal stability, and good compatibility with silicone rubber. The heat resistance and arc burning resistance of rubber have important application prospects in the fields of aerospace, high-voltage and ultra-high-voltage power transmission and transformation.

Description

technical field [0001] The invention relates to a functional silicone resin, in particular to a high-temperature-resistant silicone-boron ceramic precursor, a preparation method thereof, and an application in addition-type liquid silicone rubber. Background technique [0002] In recent years, with the rapid development of aerospace and high-voltage and ultra-high-voltage transmission and transformation grids, addition-type liquid silicone rubber (ALSR) has been widely used in aerospace sealing materials, insulators, wires and cables, etc. High temperature performance and tracking resistance put forward higher requirements. [0003] At present, the heat resistance and tracking resistance of silicone rubber are mainly improved by adding heat-resistant inorganic fillers. Patent CN102532917A mixes cerium oxide, high-temperature-resistant ceramic powder and boehmite in a mass ratio of 10:45:45 as a high-temperature-resistant additive, and the addition amount is 40 parts. The hea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K13/02C08K5/55C08K3/36C07F7/08
Inventor 赖学军郭燕霞曾幸荣李红强张亚军
Owner SOUTH CHINA UNIV OF TECH
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