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Preparation method for ceramic precursor binder allowed to be cured at room temperature

A ceramic precursor, room temperature curing technology, used in adhesives, non-polymer adhesive additives, adhesive additives, etc., to achieve the effects of wide application, low price, and simple and easy-to-obtain fillers

Active Publication Date: 2014-12-24
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Zhang et al. (Mater Sci Eng A, 2011, (528): 2952~2959) modified silicone resin with epoxy resin to prepare a high temperature resistant silicone adhesive that can be cured at room temperature, but the strength after heat treatment at 1000 °C is only 9.44 MPa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 69g (3mol) sodium metal and toluene to a three-necked flask equipped with a condensing reflux device and a mechanical stirring device, heat to 100°C under the protection of an inert atmosphere, then add 117g (1mol) methyldichlorosilane dropwise, and the dropwise addition is complete Finally, keep warm at 100°C for 4 hours, filter and distill off the organic solvent to obtain liquid polymethylsilane with a viscosity of 76.0mPa·s;

[0021] Add 28g of liquid polymethylsilane and 30g of 2,4,6,8-tetramethyl-2,4,6,8-tetravinylcyclotetrasilane into a 250mL three-necked flask equipped with a condensing reflux device and a mechanical stirring device Oxane, heated to 120 ° C for 4 hours to obtain 57.1 g of yellow viscous polycarbosiloxane precursor, and the whole reaction process was under the protection of nitrogen;

[0022] Add 20g of boron carbide powder with a particle size of 2.5-3.5μm and 10g of glass powder with a particle size of 10-20μm and a melting point of 400-700...

Embodiment 2

[0024] Add 92g (4mol) sodium metal and toluene to a three-necked flask equipped with a condensing reflux device and a mechanical stirring device, heat to 90°C under the protection of an inert atmosphere, then add 174.5g (1.5mol) methyldichlorosilane dropwise, drop After the addition, keep warm at 90°C for 6 hours, filter and distill off the organic solvent to obtain liquid polymethylsilane with a viscosity of 23.1mPa·s;

[0025] Add 20.0 g of liquid polymethylsilane and 20.0 g of 2,4,6,8-tetramethyl-2,4,6,8-tetraethenyl ring into a 250 mL three-necked flask equipped with a condensing reflux device and a mechanical stirring device Tetrasiloxane, heated to 110°C for 5 hours to obtain 38.9g yellow viscous polycarbosiloxane precursor, the whole reaction process was under the protection of nitrogen;

[0026] Add 15.0 g of boron carbide powder with a particle size of 1.5 to 5 μm and 10.0 g of glass powder with a particle size of 30 to 50 μm and a melting point range of 600 to 900 ° ...

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Abstract

The invention discloses a preparation method for a ceramic precursor binder allowed to be cured at the room temperature. The preparation method comprises the following steps: firstly, adding metallic sodium and methylbenzene in a three-mouth flask with a condensation flux device and a mechanical stirring device; heating the mixture to 80-120DEG C under the protection of inert gases, and dropping methyl dichloresilane; after the dropping is finished, preserving the heat at the temperature of 80-120DEG C for 4-12 hours, filtering, distilling and removing an organic solvent to obtain liquid polysilane; secondly, performing heat preservation on the liquid polysilane and 2,4,6,8-tetramethyl-2,4,6,8-tetravinyl cyclotetrasiloxane at the temperature of 80-160DEG C under the protection of the inert gases for 1-6 hours to obtain a liquid siloxane polycarbonate precursor; thirdly, uniformly mixing the liquid siloxane polycarbonate precursor with boron carbide powder, glass powder and a compound containing platinum to obtain the ceramic precursor binder. By using the preparation method disclosed by the invention, the ceramic precursor binder which can be cured at the room temperature and has excellent temperature resistance and binding performance can be prepared.

Description

technical field [0001] The invention relates to a preparation method of a ceramic precursor binder, in particular to a preparation method of a room temperature curable ceramic precursor binder. Background technique [0002] Bonding technology is an important measure to improve the structural efficiency of aircraft. It has the advantages of small deformation of parts, uniform stress distribution, high bonding strength, bonding properties and materials with large differences in thickness, simple process, and can reduce the weight of components. At present, high temperature resistant adhesives are mainly divided into inorganic high temperature resistant adhesives and organic high temperature resistant adhesives. Inorganic binder has excellent high and low temperature resistance, and can be used in the range of -180 to 2900 ° C. However, it has poor acid and alkali resistance and water resistance, low cohesive strength, high brittleness, and is not impact resistant. The bonding...

Claims

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Application Information

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IPC IPC(8): C09J183/16C09J11/04C08G77/60
Inventor 王小宙王军王浩简科
Owner NAT UNIV OF DEFENSE TECH
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