Alkoxysilane Surface Treatment Agent for Substrate Bonding
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Solution Overview
Problem
Alkoxysilane compounds with cyclic silazane structures face challenges in reactivity with substrate hydroxyl groups due to steric hindrance, leading to incomplete surface treatment and reduced durability and stability, as they require high temperatures or long reaction times, and are environmentally detrimental due to volatile organic compound generation.
Innovation Solution
A surface treatment agent containing an alkoxysilane compound with a cyclic silazane structure, where the amino group substituent is a linear alkyl group with 6 to 20 carbon atoms, allowing for efficient covalent bonding with substrate hydroxyl groups without hydrolysis during post-treatment, thereby improving durability and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If alkoxysilane compounds with cyclic silazane structures are used as surface treatment agents, then the problem of alcohol generation and environmental impact is reduced, but reactivity with substrate hydroxyl groups decreases due to steric hindrance
Solution Approach 1:
The patent changes the chemical structure parameters of the cyclic silazane compound by specifying that the amino group substituent must be a linear alkyl group with 6 to 20 carbon atoms. This parameter optimization reduces steric hindrance compared to bulkier substituents while maintaining the environmental benefits of the cyclic silazane structure, thereby achieving both low alcohol generation and adequate reactivity with substrate hydroxyl groups.
2Reliability
If reaction temperature is increased or reaction time is lengthened to improve surface treatment completeness, then reactivity with hydroxyl groups is enhanced, but productivity is lowered
Solution Approach 1:
The patent optimizes the molecular structure parameters of the alkoxysilane compound to achieve balanced reactivity. By specifying the linear alkyl group with 6 to 20 carbon atoms, the compound achieves sufficient reactivity with hydroxyl groups under mild conditions, eliminating the need for high temperatures or extended reaction times, thus maintaining high productivity while ensuring complete surface treatment.
3Reliability
If unreacted silanol groups are present on the substrate surface, then the desired effect from amino groups cannot be sufficiently exhibited, but increasing reaction conditions to eliminate unreacted groups reduces productivity
Solution Approach 1:
The patent specifies precise structural parameters for the alkoxysilane compound (linear alkyl group with 6 to 20 carbon atoms) that optimize the balance between reactivity and stability. This ensures that silanol groups react efficiently with substrate hydroxyl groups under mild conditions, minimizing unreacted groups without requiring excessive reaction conditions, thus maintaining both effectiveness and productivity.
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 surface treatment agent enables rapid and effective bonding with substrates, enhancing durability and stability while minimizing environmental impact by reducing volatile organic compound generation.
Implementation Method 1
a silanol group generated by hydrolysis of the hydrolyzable silyl group forms a covalent bond with a hydroxyl group on the surface of the substrate
Implementation Method 2
a silanol group generated by hydrolysis of the hydrolyzable silyl group
Implementation Method 3
since silanol groups produced by hydrolysis condense to produce siloxane
Data Source
AI summary
Provided is a surface treatment agent including an alkoxysilane compound having a cyclic silazane structure represented by the following general formula (1):wherein R1 represents an unsubstituted linear alkyl group having 6 to 20 carbon atoms, R2 represents a substituted or unsubstituted alkylene group having 3 to 6 carbon atoms that may include a heteroatom, R3 and R4 each independently represent a substituted or unsubstituted monovalent hydrocarbon group having 1 to 10 carbon atoms, and n represents an integer of 0 or 1.