Chlorosilane Polymer Stabilization via Alcohol Degradation
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Solution Overview
Problem
Conventional methods fail to prevent the generation of solid chlorosilane polymer and silica adhesion in narrow pipe components during the hydrolysis of viscous liquid chlorosilane polymer, leading to safety risks and difficulties in stabilization and removal.
Innovation Solution
A two-step method involving the degradation of chlorosilane polymer with alcohol to form alkoxide and subsequent hydrolysis, which prevents the formation of solid chlorosilane polymer and silica adhesion by diluting the alkoxide with alcohol and performing hydrolysis, allowing for safe stabilization and removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If water is introduced to promote hydrolysis reaction of chlorosilane polymer, then the chlorosilane polymer is stabilized, but shells of crosslinked gel of SiO2 are formed on the surface, inhibiting water permeation and preventing complete degradation
Solution Approach 1:
The patent introduces alcohol as an intermediary substance to facilitate the degradation of chlorosilane polymer. The alcohol penetrates the polymer and promotes hydrolysis reaction, forming alkoxide intermediate that eventually converts to SiO2. This intermediary approach avoids the formation of surface gel shells that would block water penetration, as alcohol molecules are smaller and more capable of penetrating the polymer matrix uniformly.
2Productivity
If hydrolysis reaction proceeds rapidly for thick chlorosilane polymer deposition, then stabilization is achieved quickly, but solid chlorosilane polymer is formed as intermediate degradation product, increasing firing and exploding risks
Solution Approach 1:
The patent uses alcohol as an intermediary to control the hydrolysis reaction rate. The alcohol-promoted hydrolysis proceeds through an alkoxide intermediate stage, which prevents the direct formation of solid chlorosilane polymer. This controlled degradation pathway maintains reaction speed while avoiding the accumulation of hazardous solid intermediates that pose firing and explosion risks.
Solution Approach 2:
The patent changes the chemical environment by introducing alcohol instead of using pure water for hydrolysis. This parameter change modifies the reaction mechanism and intermediate products, transforming the direct hydrolysis pathway into an alcoholysis pathway that produces alkoxide intermediates rather than solid polymer deposits, thereby reducing safety hazards.
3Reliability
If water is introduced into narrow pipe components for hydrolysis, then chlorosilane polymer is stabilized, but silica adheres to the narrow inside of pipe components, making removal difficult
Solution Approach 1:
The patent employs alcohol as an intermediary agent that facilitates hydrolysis in narrow pipe components without causing silica adhesion. The alcohol promotes uniform degradation of chlorosilane polymer throughout the pipe interior, and the resulting SiO2 forms as fine particles suspended in the alcohol solution rather than adhering to pipe surfaces, enabling easy removal through flushing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively stabilizes the chlorosilane polymer without forming solid chlorosilane polymer, prevents silica adhesion in pipe components, and ensures safe handling and removal, reducing the risk of explosions and fires.
Implementation Method 1
a step of bringing alcohol into contact with the chlorosilane polymer, degrading the chlorosilane polymer to alkoxide, hydrogen chloride and hydrogen
Implementation Method 2
diluting the degraded alkoxide with an alcohol solvent
Implementation Method 3
a step of performing hydrolysis for the alkoxide
Data Source
AI summary
This disclosure is to make it possible to easily stabilize a chlorosilane polymer while preventing a solid chlorosilane polymer from being generated. Disclosed is a method for stabilizing a chlorosilane polymer generated secondarily in a step of a chemical vapor deposition method using chlorosilane-based gas, the method including: a step of bringing alcohol into contact with the chlorosilane polymer, degrading the chlorosilane polymer to alkoxide, hydrogen chloride and hydrogen, and diluting the degraded alkoxide with the alcohol; and a step of performing hydrolysis for the alkoxide.