Mercapto-Alkoxysilyl Organopolysiloxane for Low-Volatility Adhesion
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Solution Overview
Problem
Existing organosilicon compounds with mercapto groups have high volatility and insufficient adhesion to inorganic substrates like glass and metals, limiting their effectiveness as adhesion promoters.
Innovation Solution
Development of an organopolysiloxane containing mercapto groups and trialkoxysilyl or dialkoxymethylsilyl groups, produced through hydrolytic or co-hydrolytic condensation of specific organosilicon compounds, resulting in a low-volatility resin with enhanced adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If low-molecular-weight mercapto group-containing organosilicon compounds are used, then adhesiveness and adhesion to inorganic substrates are improved, but volatility increases
Solution Approach 1:
The invention segments the molecular structure into distinct functional components: mercapto groups for adhesion, alkoxysilyl groups for crosslinking, and hydrolyzable groups for controlled polymerization. This segmentation allows each component to perform its specific function while maintaining overall molecular stability and low volatility.
Solution Approach 2:
The invention creates a composite organopolysiloxane structure that combines multiple functional groups (mercapto, alkoxysilyl, and hydrolyzable groups) within a single molecular system. This composite structure integrates the adhesion benefits of mercapto groups with the volatility reduction of higher molecular weight polysiloxane backbones.
2Object-generated harmful factors
If oligomers obtained by hydrolytic condensation of mercapto group-containing alkoxysilanes are used, then volatility is reduced, but adhesiveness and adhesion to inorganic substrates become insufficient
Solution Approach 1:
The invention changes the molecular parameters by introducing specific functional group combinations and controlling the polymerization degree. The presence of unhydrolyzed alkoxysilyl groups and mercapto groups in specific proportions, along with controlled molecular weight, creates the optimal balance between low volatility and high adhesiveness.
3Strength
If trialkoxysilyl groups are introduced into the organopolysiloxane structure, then adhesion to inorganic substrates is improved, but molecular weight increases leading to higher viscosity
Solution Approach 1:
The invention applies local quality by concentrating trialkoxysilyl groups at specific positions within the molecular structure where they can effectively interact with inorganic substrates, while maintaining a lower overall molecular weight through controlled polymerization. This localized functional group distribution provides high adhesion without excessive viscosity increase.
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 organopolysiloxane exhibits low volatility and excellent adhesion to inorganic substrates, making it an effective adhesion promoter for materials such as glass and metals.
Implementation Method 1
oligomers obtained by (co) hydrolytic condensation of monomer components containing mercapto group-containing alkoxysilanes
Implementation Method 2
Organosilicon compounds containing a mercapto group and a hydrolyzable silyl group have been widely used as adhesion promoters for inorganic substrates such as glass and metals
Data Source
AI summary
Provided is an organopolysiloxane which is expressed by average compositional formula (1) and which comprises: a mercapto group-containing organic group; and a trialkoxysilyl group-containing organic group and/or a dialkoxymethylsilyl group-containing organic group. The organopolysiloxane exhibits low volatility and excellent adhesiveness and adhesion with respect to an inorganic base material.(A)a(B)b(C)c(D)dSiO(4-a-b-c-d)/2 (1)(In the formula, A represents a mercapto group-containing organic group, B represents a trialkoxysilyl group-containing organic group or a dialkoxymethylsilyl-containing organic group, C represents a hydrolyzable group, D represents a C1-12 alkyl group, a C1-10 haloalkyl group, or a C6-12 aryl group, and a, b, c, and d represent numbers that satisfy 0<a<1,0<b<1,0<c<3,0≤d<1, and 0<a+b+c+d<4.)