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Organic silicon-boron ceramic precursor as well as preparation method and application thereof

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 achieve the effect of facilitating large-scale production, improving heat resistance and arc ablation resistance, and not easy to hydrolyze

Active Publication Date: 2015-12-16
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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  • Organic silicon-boron ceramic precursor as well as preparation method and application thereof
  • Organic silicon-boron ceramic precursor as well as preparation method and application thereof
  • Organic silicon-boron ceramic precursor as well as preparation method and application thereof

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 organic silicon-boron ceramic precursor as well as a preparation method and an application thereof. The preparation method comprises steps as follows: cyclotetrasiloxane, trifunctional siloxane and boric acid are stirred at the temperature of 25-35 DEG C for 10-20 min under the action of an acid catalyst, then heated to the temperature of 80-100 DEG C for a polycondensation reaction and finally heated to the temperature of 120-150 DEG C for a continuous reaction, and the organic silicon-boron ceramic precursor is obtained through after-treatment. The prepared ceramic precursor has the controllable boron content, is high in thermal stability and has good compatibility with silicone rubber, the preparation method is simple and environment-friendly, the heat resistance and the arc firing resistance of the additional liquid silicone rubber can be substantially improved through addition of only 1.0 part of the organic silicon-boron ceramic precursor by mass, and the organic silicon-boron ceramic precursor has the important application prospect in fields of aviation and aerospace, high-voltage and extra-high-voltage power transmission and transformation and the like.

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 Applications(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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