Silane-Modified Polymer Composition for Heat-Resistant PU Adhesives
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Solution Overview
Problem
Existing polyurethane adhesives face challenges with conflicting properties of long open time and rapid strength development, and incorporating acrylate polymers introduces air and limits resistance to temperature and chemicals, while bonding inorganic materials without surface treatment leads to adhesion issues.
Innovation Solution
A method involving radical polymerization of ethylene-unsaturated monomers with silane-modified polymers in polyols or prepolymers with terminal isocyanate groups, forming a polymer composition that crosslinks with moisture-reactive groups to enhance adhesion and resistance to heat and chemicals, allowing for label-free, safe handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylate polymers are incorporated into polyurethane adhesives to achieve long open time and rapid strength development, then adhesive performance is improved, but resistance to temperature and chemicals deteriorates due to thermoplastic properties
Solution Approach 1:
The patent changes the chemical structure of the acrylate polymer by incorporating silane groups, transforming it from a thermoplastic material to a thermosetting material through crosslinking. This parameter change in molecular structure enables the adhesive to maintain both good adhesive performance and high resistance to temperature and chemicals.
Solution Approach 2:
The patent creates a composite material system by combining silane-modified acrylate polymers with polyol or isocyanate groups. The silane groups undergo crosslinking reactions to form a three-dimensional network structure, resulting in a composite material that exhibits both the adhesive properties of acrylate polymers and the thermal/chemical resistance of crosslinked thermosets.
2Productivity
If acrylate polymers are used in polyurethane adhesives to achieve rapid strength development, then initial stack is improved, but adhesion to inorganic materials deteriorates without surface treatment
Solution Approach 1:
The patent modifies the surface properties of inorganic materials by introducing silane groups that can chemically bond to both the inorganic substrate and the polymer matrix. This parameter change in surface chemistry enables effective adhesion without requiring mechanical surface treatment, while maintaining rapid strength development.
Solution Approach 2:
The silane-modified acrylate polymer acts as an intermediary between inorganic materials and the polyurethane adhesive system. The silane groups provide anchoring to inorganic surfaces through chemical bonding, while the acrylate polymer portion integrates with the polyurethane matrix, creating a bridge that enables strong adhesion without surface treatment.
3Duration of action of moving object
If acrylate polymers are incorporated to achieve long open time, then bonding time is extended, but air entrapment and dissolution difficulties increase
Solution Approach 1:
The patent changes the molecular weight and viscosity parameters of the acrylate polymer by controlling the degree of polymerization and crosslinking. This enables the polymer to maintain low viscosity and good dissolvability in polyol, reducing air entrapment during mixing while preserving the long open time required for manual joining.
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 resulting polymer composition exhibits increased resistance to heat and chemicals, improved adhesion to inorganic materials, and expanded application range, with the ability to form thermosets without isocyanate monomers, enabling safer handling and broader adhesive uses.
Implementation Method 1
a silane-modified polymer, which is produced by means of a radical chain polymerization, in a polyol or in a prepolymer with terminal isocyanate groups
Implementation Method 2
crosslinks with moisture-reactive groups to enhance adhesion and resistance to heat and chemicals
Data Source
AI summary
The invention relates to a method for producing a polymer composition, wherein a silane-modified ethylene-based polymer which is preferably a silane-modified acrylate polymer is polymerized in a polyol or in a prepolymer with terminal isocyanate groups, and to a polymer composition which is produced by means of said method. The invention additionally relates to a method for producing a moisture-curing polyurethane hot-melt adhesive composition and a 1K polyurethane adhesive based on the polymer composition according to the invention together with the moisture-curing polyurethane hot-melt adhesive composition produced therewith and the 1K polyurethane adhesive.