Silane-Functional Polymer Sealant Adhesion Strength
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Solution Overview
Problem
Moisture-curing compositions based on silane-functional polymers often fail to achieve a balance between rapid curing, high tensile strength, and good adhesion properties, particularly in applications requiring extensibility.
Innovation Solution
The development of moisture-curing compositions incorporating a silane-functional polymer with specific end groups and a reaction product derived from aminosilanes and silane-group-free alkenes, which enhances extensibility and adhesion without compromising curing rate or adhesion properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If moisture-curing compositions based on silane-functional polymers are used to achieve rapid curing and high tensile strength, then curing rate and strength are improved, but extensibility deteriorates
Solution Approach 1:
The patent modifies the chemical structure of silane-functional polymers by introducing specific end groups with formula (I) containing alkyl groups (R1), acyl or alkyl groups (R2), and alkylene groups (R3). These structural parameter changes enable the polymer to achieve both high tensile strength and enhanced extensibility simultaneously, resolving the contradiction between strength and adaptability
Solution Approach 2:
The invention creates a composite system combining silane-functional polymers with specific end groups (formula I) and reaction products from aminosilanes and silane-group-free alkenes. This composite material structure integrates the high strength characteristics of silane crosslinked networks with the extensibility provided by the specific polymer architecture, achieving both contradictory properties
2Strength
If organoalkoxysilanes are added as additives to tweak adhesion and reactivity, then adhesion properties are improved, but storage stability deteriorates
Solution Approach 1:
The patent changes the chemical parameters of the silane-functional polymer by defining specific end groups with formula (I) containing controlled amounts of hydrolyzable alkoxy groups and organic substituents. This parameter optimization enables the polymer to exhibit both high adhesion properties and improved storage stability, eliminating the need for additional organoalkoxysilane additives that would compromise stability
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 compositions exhibit improved extensibility, high tensile strength, and good adhesion properties, making them suitable for applications as elastic adhesives or sealants with rapid curing capabilities.
Implementation Method 1
moisture-curing compositions based on silane-functional polymers
Implementation Method 2
moisture-curing compositions based on silane-functional polymers
Implementation Method 3
reaction product prepared from at least one aminosilane and at least one silane-group-free alkene
Data Source
AI summary
The current invention relates to a moisture-hardening composition that contains, in addition to a silane-functional polymer with end groups of formula (I), a reaction product that can be manufactured from an amino silane with primary amino groups and an alkene that is free of silane groups. The compositions are characterized by improved expandability with concurrent high reactivity, good adhesion characteristics, and high tear strength and are suited especially for use as elastic bonding substance or sealant.