Polysiloxane Production Using Secondary Alcohols
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Solution Overview
Problem
The production of polysiloxanes with carbon-carbon unsaturated bonds and hydrosilyl groups often faces issues with gelation and increased molecular weight during and after production, affecting storage stability, particularly when using organic solvents with hydroxyl groups.
Innovation Solution
Using a reaction solvent comprising secondary or tertiary alcohols with 4 to 6 carbon atoms, such as 2-butanol, during hydrolysis and polycondensation to prevent gelation and maintain molecular weight stability, ensuring the polysiloxane can be stored without gelation or molecular weight increase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If organic solvents with hydroxyl groups are used during hydrolysis and polycondensation, then the reaction can proceed, but gelation occurs and molecular weight increases during storage
Solution Approach 1:
The patent changes the chemical parameter of the solvent by selecting specific alcohols with defined molecular structures (secondary or tertiary alcohols with 4-6 carbon atoms) instead of using generic organic solvents with hydroxyl groups. This specific parameter change prevents gelation and molecular weight increase while maintaining reaction feasibility.
Solution Approach 2:
The patent uses alcohols that can be easily evaporated after serving their purpose as reaction media. These alcohols facilitate the hydrolysis and polycondensation reaction but do not remain in the final polysiloxane product, avoiding long-term stability issues.
2Ease of operation
If conventional organic solvents are used, then dissolution can occur, but gelation and molecular weight increase happen during storage
Solution Approach 1:
The patent specifies precise parameter ranges for the alcohol solvents (secondary or tertiary, 4-6 carbon atoms) to achieve the optimal balance between dissolution capability and storage stability, preventing gelation while maintaining product reliability.
3Strength
If the polysiloxane is produced with high molecular weight, then heat resistance improves, but gelation occurs during production and storage
Solution Approach 1:
The alcohol solvent acts as an intermediary that facilitates the formation of polysiloxane with desired molecular weight and heat resistance properties while preventing gelation during the production and storage processes through its specific chemical structure and properties.
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
The method effectively prevents gelation and maintains storage stability of polysiloxanes, ensuring they remain stable and do not exhibit increased molecular weight, thereby producing high-quality products with improved handling and heat resistance.
Implementation Method 1
a method that subjects a raw material monomer to hydrolysis and polycondensation when producing a polysiloxane
Data Source
AI summary
The present invention is a method for producing a polysiloxane represented by formula (1), which includes a condensation step wherein a hydrolysis/polycondenzation of a starting material monomer that forms a constituent unit is carried out in a reaction solvent that contains at least one alcohol that is selected from among secondary alcohols having 4-6 carbon atoms and tertiary alcohols having 4-6 carbon atoms. The method for producing a polysiloxane of the present invention suppresses problems such as gelation that occurs during the production, and increase in the molecular weight or gelation that occurs during storage after the production or the like.