Modified organic silicon composite material as well as preparation method and application thereof

A composite material and silicone technology, applied in the directions of adhesive additives, non-polymer adhesive additives, adhesives, etc., can solve the problems of poor uniformity, limited temperature resistance, and low comprehensive performance, and achieve low dielectric, low Loss, the effect of high physical strength

Active Publication Date: 2021-11-02
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing silicone materials have limited temperature resistance, poor uniformity and low comprehensive performance. Aiming at the defects in the prior art, a modified silicone composite material and its preparation method and application are provided

Method used

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  • Modified organic silicon composite material as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Weigh 55g of phenyl silicone rubber and 6g of fumed silica, mix and stir at room temperature for 1.5h, then add 50g of No. 120 solvent oil, 1.5g of ethyl orthosilicate, and 0.5g of dibutyltin dilaurate and stir for 3min; then Pour the composite slurry into the mold, vacuumize and defoam for 30 minutes; finally, place it at 25°C and 55% air moisture content for 168 hours to completely cure and form.

Embodiment 2

[0051] Weigh 6g of boron oxide, 3.4g of boron powder, and 2.2g of magnesium boride for pre-mixing, and then place them in a ball mill for 18 hours of ball milling at 300r / min to obtain a precursor. A ball with a diameter of 10mm contains 220g, and a ball with a diameter of 5mm contains 650g; then, the resulting precursor is placed in a horizontal tube furnace under 300sccm NH 3 Under the flow rate, high temperature sintering treatment at 1300°C for 6h to obtain crude boron nitride nanotubes; then, add the crude boron nitride nanotube powder into 33% concentration nitric acid solution, reflux at 140°C for 20h, and deionized water after cooling Wash with ethanol repeatedly to neutrality and dry to obtain pretreated boron nitride nanotubes; add 2.5g of pretreated boron nitride nanotubes to 0.4mol / L, volume of 500mL cerous nitrate ethanol solution and ultrasonic treatment for 45min, Then, 0.1 mol sodium hydroxide solution was added dropwise to pH = 10 during the stirring process, ...

Embodiment 3

[0053] Weigh 6g of boron oxide, 3.4g of boron powder, and 2.2g of magnesium boride for pre-mixing, and then place them in a ball mill for 300r / min ball milling for 18 hours to obtain the precursor. The grinding beads are zirconium balls, and the balls with a diameter of 15mm in the ball mill contain 150g. A ball with a diameter of 10mm contains 220g, and a ball with a diameter of 5mm contains 650g; then, the resulting precursor is placed in a horizontal tube furnace, 300sccm NH 3 1300°C for 6 hours at high temperature to obtain crude boron nitride nanotubes; then, add the obtained crude boron nitride nanotubes to a 33% nitric acid solution, reflux at 140°C, and rinse with deionized water and ethanol repeatedly until Neutralize and dry to obtain pretreated boron nitride nanotubes; add 1g of pretreated boron nitride nanotubes into 0.4mol / L, volume of 660mL cerous nitrate ethanol solution and ultrasonic treatment for 45min, then drop Add 0.1mol sodium hydroxide solution pH = 10, ...

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Abstract

The invention relates to the technical field of functional materials, and provides a modified organic silicon composite material and a preparation method and application thereof, the preparation method comprises the following steps: (1) activating boron oxide, boron powder and magnesium boride to obtain a precursor; (2) sintering the precursor obtained in the step (1) and ammonia gas to obtain a boron nitride nanotube crude product; (3) carrying out heat treatment on the boron nitride nanotube crude product obtained in the step (2) in an acid solution, and washing to obtain a pretreated boron nitride nanotube; (4) adding the pretreated boron nitride nanotube obtained in the step (3) into a cerous nitrate ethanol solution, and adjusting the pH value to obtain CeO2@BNNTs; and (5) mixing the CeO2@BNNTs obtained in the step (4) with phenyl siloxane rubber, fumed silica, dibutyltin dilaurate and tetraethoxysilane to obtain slurry, and curing the slurry to obtain the modified organic silicon composite material which has the properties of high temperature resistance, low dielectric and low loss.

Description

technical field [0001] The invention relates to the technical field of functional materials, in particular to a modified organosilicon composite material and its preparation method and application. Background technique [0002] Boron nitride nanotubes (BNNTs) are similar to one-dimensional carbon nanotubes, which have good properties such as high temperature resistance, oxidation resistance, thermal conductivity, electrical insulation and neutron absorption. Compared with carbon nanotubes, BNNTs not only have better mechanical strength and lightweight characteristics, but also have better high temperature resistance and oxidation resistance than carbon nanotubes; on the other hand, the interface between boron nitride nanomaterials and polymers The binding force is better than that of corresponding carbon nanomaterials, and it is suitable as a function-enhancing filler for polymer materials; moreover, boron nitride nanomaterials have stable electrical insulation properties, w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/04C08K7/24C08K9/12C08K3/22C08K9/02C08K3/36C09J183/04C09J11/04C08J5/18
CPCC08K7/24C08K9/12C08K3/22C08K9/02C08K3/36C09J183/04C09J11/04C08J5/18C08K2003/2213C08L2203/16C08L2201/08C08J2383/04C08L83/04
Inventor 兰天张春波董立超蔡汝峰张昊
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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