Renewable Polyurethane Adhesive with Temperature-Stable Power
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Solution Overview
Problem
Existing heat-curable adhesive compositions based on polyurethane and polyether polymers with hydrolysable alkoxysilane end groups rely on non-renewable starting materials, which is a drawback in the context of 'green' chemistry aiming to reduce fossil fuel-derived components.
Innovation Solution
A heat-curable adhesive composition comprising 47-60% of polymers with hydrolysable alkoxysilane end groups, where at least 50% of these polymers are derived from renewable sources, combined with 37-50% of a compatible tackifying resin and 0.01-3% of a crosslinking catalyst, forming a self-adhesive support with maintained adhesive power across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyurethane and polyether polymers with hydrolysable alkoxysilane end groups are used in adhesive compositions, then adhesive power and immediate tack power are improved, but the starting materials are derived from non-renewable sources
Solution Approach 1:
The patent changes the chemical composition parameters by replacing polyoxyalkylene diols (from fossil fuels) with polyester diols derived from renewable vegetable oils. This substitution maintains the polymer's functional properties while altering the source material, thereby reducing dependence on non-renewable resources while preserving adhesive performance
Solution Approach 2:
The invention creates a composite adhesive system combining polymers from renewable sources with hydrolysable alkoxysilane end groups and compatible tackifying resins. This composite approach allows the use of bio-based polymers to achieve both environmental benefits and technical performance requirements for temperature-stable adhesive power
2Temperature
If the adhesive composition is designed for wide temperature range application, then temperature stability is improved, but the formulation complexity increases
Solution Approach 1:
The patent achieves temperature stability by carefully selecting and optimizing the molecular weight, hydroxyl number, and chemical structure of the polyester diol and tackifying resin components. These parameter adjustments allow a single formulation to maintain adhesive performance across -60°C to +200°C without requiring complex multi-component systems
Solution Approach 2:
The formulation combines polymers with hydrolysable alkoxysilane end groups and compatible tackifying resins in specific ratios (20-85% polymer, 15-80% resin). This composite structure provides both low-temperature flexibility and high-temperature stability through the complementary properties of the components, achieving wide temperature range performance while maintaining relatively simple formulation
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 composition achieves adhesive and tack power properties comparable to prior art while utilizing renewable materials, ensuring effective bonding from -60°C to +200°C, suitable for various applications including automotive and industrial uses.
Implementation Method 1
the coating of which onto a support and heating lead, after a chemical crosslinking reaction performed in the presence of atmospheric moisture, to the production of a self-adhesive support
Implementation Method 2
polymers bearing hydrolysable alkoxysilane end groups
Implementation Method 3
heating lead, after a chemical crosslinking reaction
Data Source
AI summary
Heat-curable adhesive composition:47-60% of polyether/polyurethane bearing alkoxysilane end groups and polyurethanes bearing alkoxysilane end groups of formula (II):in which: R6 is a divalent C5-C15 hydrocarbon-based radical; R7 is a divalent C1-C3 alkylene radical; R8 and R9 are a C1-C4 alkyl; q is 0, 1 or 2; r is such that the number-average molar mass of the polymers of formula (II) is between 900 Da and 11 kDa; R10 is a divalent polyester block with a hydroxyl number IOH of between 40 and 60 mg KOH/g;37-50% of a compatible tackifying resin; and0.01-3% of a crosslinking catalyst.