Curable Composition for Thermoplastic Polyolefin Adhesiveness
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Solution Overview
Problem
Current adhesive technologies fail to achieve sufficient adhesiveness to thermoplastic polyolefin (TPO) substrates, which are commonly used in waterproof sheets and automotive applications, due to their adhesion-resistant nature.
Innovation Solution
A curable composition comprising a reactive silicon group-containing polyoxyalkylene polymer, a polyolefin polymer, and a tackifying resin is developed, which enhances adhesiveness to TPO substrates by forming a siloxane bond upon reaction with moisture, thereby improving bonding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional adhesives or bonding techniques are used, then general adhesiveness is achieved, but adhesiveness to TPO substrate is insufficient
Solution Approach 1:
The invention uses a composite material system consisting of polyoxyalkylene polymer with reactive silicon groups, polyolefin polymer, and tackifying resin. This composite formulation creates synergistic effects where the polyolefin polymer provides compatibility with TPO substrate, the reactive silicon groups form strong chemical bonds, and the tackifying resin enhances initial adhesion, collectively achieving reliable bonding to adhesion-resistant substrates.
Solution Approach 2:
The invention changes the chemical composition parameters of the adhesive system by incorporating specific ratios of polyolefin polymer (5-50 parts by weight) and tackifying resin (5-30 parts by weight) per 100 parts by weight of polyoxyalkylene polymer. These parameter adjustments optimize the balance between substrate compatibility, initial tack, and final bond strength for TPO applications.
2Strength
If reactive silicon group-containing polymers are used, then chemical bonding capability is improved, but adhesiveness to thermoplastic substrates remains insufficient
Solution Approach 1:
The polyolefin polymer acts as an intermediary substance between the reactive silicon group-containing polyoxyalkylene polymer and the TPO substrate. It provides chemical and physical compatibility with the thermoplastic substrate while allowing the reactive silicon groups to form strong chemical bonds, thus bridging the compatibility gap between adhesive and substrate.
Solution Approach 2:
The adhesive formulation assigns different functional roles to different components: the polyolefin polymer provides substrate compatibility and wetting, the reactive silicon groups provide chemical bonding strength, and the tackifying resin provides initial adhesion. Each component contributes its specific local quality to achieve overall effective bonding to TPO.
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 curable composition demonstrates excellent adhesiveness to TPO substrates, as evidenced by successful bonding and mechanical properties such as tensile strength and elongation, making it suitable for industrial applications like waterproof sheets and automotive components.
Implementation Method 1
organic polymers each having reactive silicon group(s) in the molecule turn to a rubbery cured product by a matter that the reactive silicon group hydrolyzed by moisture forms a siloxane bond
Implementation Method 2
reactive silicon group-containing polyoxyalkylene polymer... forms a siloxane bond upon reaction with moisture
Data Source
AI summary
An object of the invention is to provide a curable composition wherein the adhesiveness to thermoplastic polyolefin (TPO) is improved. The invention is a curable composition containing (A) a polyoxyalkylene polymer having reactive silicon group(s), (B) a polyolefin polymer, and (C) a tackifying resin.