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Synthesis of silicon based ceramic forerunner by chloro-silicane hybrid aminolysis modification and preparation method thereof

A ceramic precursor and a technology for the precursor are applied in the field of dichlorosilane mixed aminolysis modification to synthesize a silicon-based ceramic precursor and the preparation thereof, can solve the problems of unsuitability for industrialized production and high toxicity of the reaction system, and achieve low cost and high reaction efficiency. The effect of easy control of conditions and low toxicity

Inactive Publication Date: 2008-03-12
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

In this new process for producing special types of materials called polymers or plasticizers that can be used on various products such as food packaging films, medical devices, paints, coatings, adhesives, etc., it provides technical benefits over existing methods due to its lower harmfulness compared to traditional chemical reactions.

Problems solved by technology

This patented describes different ways to make ceramies that are resistant against extreme temperatures or corrosive environments. These techniques involve mixing certain chemical compounds together at specific conditions (temperature) before making them into powders by various means like spray dryers or solvent evaporation). By doing these processes, it becomes possible to create stable ceramites without harmful substances from other sources.

Method used

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  • Synthesis of silicon based ceramic forerunner by chloro-silicane hybrid aminolysis modification and preparation method thereof
  • Synthesis of silicon based ceramic forerunner by chloro-silicane hybrid aminolysis modification and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: 3.15g methylhydrogendichlorosilane and 2.38g dimethyldichlorosilane are magnetically stirred and mixed (the molar ratio is 3:2), the system is vacuumized (vacuum degree 100Pa) and ammonia gas (flow rate: 20mL / min), when the dichlorosilane is completely ammonolyzed (about 10 minutes), add 0.2 g of acetic acid amide, 0.1 g of bromine water and 0.1 mL of sodium hydroxide (0.5 mol / L) solution dropwise with a dropper, and react for 15 minutes to form The liquid precursor will form a solid precursor after standing for 15 hours. The solid precursor was dried at 150°C in argon for 6h, then heated at a rate of 5°C / min under an argon atmosphere, and pyrolyzed at 1200°C to obtain a porous ceramic with an average pore size of 100 μm.

Embodiment 2

[0022] Embodiment 2: 3.15g methylhydrogendichlorosilane and 3.57g dimethyldichlorosilane are magnetically stirred and mixed (the molar ratio is 1:1), and the system is evacuated (vacuum degree 100Pa) and ammonia gas (flow rate: 30mL / min), until dichlorosilane is completely ammonolyzed (about 10 minutes), add 0.3g acetic acid amide, 0.2g bromine water and 0.2mL sodium hydroxide (concentration 0.5mol / L) solution dropwise with a dropper, pH = 10, and react A liquid precursor was formed after 20 minutes, and a solid precursor was formed after 15 hours of standing. The solid precursor was dried in argon at 150°C for 6h, then heated at a rate of 5°C / min in an argon atmosphere, and pyrolyzed at 1200°C to obtain a porous ceramic with an average pore size of 30 μm.

Embodiment 3

[0023] Embodiment 3: 7.35g methylhydrogendichlorosilane and 3.57g dimethyldichlorosilane are magnetically stirred and mixed (the molar ratio is 7: 3), the system is vacuumized (vacuum degree 100Pa) and ammonia gas (flow rate: 30mL / min), until the dichlorosilane is completely ammonolyzed (about 20 minutes), add dropwise 0.4g acetic acid amide, 0.2g bromine water and 0.5mL sodium hydroxide (concentration 0.5mol / L) solution with a dropper, pH = 12, and react A liquid precursor was formed after 30 minutes, and a solid precursor was formed after 15 hours of standing. The solid precursor was dried in argon at 150°C for 6h, then heated at a rate of 5°C / min in an argon atmosphere, and pyrolyzed at 1200°C to obtain a porous ceramic with an average pore diameter of 5 μm.

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Abstract

The present invention relates to a mixture with dichlorosilane and ammonolysis modified synthesized silicon ceram usher and the relative preparation method. The methylnaphthohydroquinone dichlorosilane is mixed with the dimethyl dichlorosilane in the anaerobic condition (vacuum or protection with inert gases), and then the ammonia gas is added into to make with ammonolysis reaction; then the acetal is added into the solution of bromine water and sodium hydroxide to make with the chemical reaction. After finishing the reaction, silicon oxide ammonia alkyl usher with liquid state or solid state are respectively obtained. The present invention uses the isocyanate created by in suit and the modified dichlorosilane to be mixed and made with ammonolysis reaction to produce the silicon oxide ammonia alkyl and moreover to obtain the silicon oxide ammonia alkyl usher. The present invention is characterized in lower toxicity of the reacting system, controllable reaction condition and lower cost and so on.

Description

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Claims

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Application Information

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Owner TIANJIN UNIV
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