Renewable Polyurethane Adhesive with Temperature-Stable Bonding
Find Innovative SolutionsGenerate Solutions
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 concern in the development of 'green' chemistry, as they do not fully utilize renewable resources.
Innovation Solution
A heat-curable adhesive composition comprising 35% to 75% polyurethanes with hydrolysable alkoxysilane end groups derived from renewable sources, such as dimerized fatty acids or alcohols, combined with a tackifying resin and a crosslinking catalyst, forming a self-adhesive support with maintained adhesive power across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyurethane and polyether polymers with hydrolysable alkoxysilane end groups are used in heat-curable adhesive compositions, then adhesive power and immediate tack power are improved, but the use of non-renewable starting materials increases
Solution Approach 1:
The patent changes the chemical composition parameters by replacing polyether diols (from non-renewable petroleum) with polyester diols (from renewable vegetable oils). This substitution maintains the hydrolysable alkoxysilane end groups necessary for crosslinking and adhesive performance while fundamentally altering the carbon source from fossil-based to renewable-based, thereby reducing dependence on non-renewable materials
Solution Approach 2:
The patent creates a composite adhesive system combining polyester diols derived from renewable resources with hydrolysable alkoxysilane end groups. This composite approach integrates the renewable polymer backbone with the crosslinking functionality, achieving both environmental sustainability and high adhesive strength through the synergistic combination of different material components
2Ease of operation
If polyether polymers are used to achieve good adhesive properties, then immediate tack power is improved, but the reliance on petroleum-derived starting materials increases
Solution Approach 1:
The patent modifies the polymer composition by substituting polyether chains with polyester chains derived from vegetable oils. This parameter change in the polymer backbone structure maintains the necessary flexibility and tack properties while eliminating petroleum dependency, as the polyester diols are synthesized from renewable triglycerides through well-established chemical processes
3Object-generated harmful factors
If renewable starting materials are used to reduce environmental impact, then sustainability is improved, but adhesive performance may be compromised
Solution Approach 1:
The patent develops a composite adhesive formulation where polyester diols from renewable sources form the polymer backbone, while hydrolysable alkoxysilane end groups provide crosslinking capability. This composite structure ensures that the renewable base polymer maintains adhesive flexibility and tack, while the silane end groups enable strong covalent bonding through moisture-cured crosslinking, thereby preserving high adhesive performance despite using renewable materials
Solution Approach 2:
The patent applies local quality by concentrating the renewable content in the polymer backbone (polyester diol portion) while maintaining the crosslinking functionality through hydrolysable alkoxysilane end groups. This localized approach ensures that the renewable materials provide the necessary flexibility and adhesion, while the silane end groups specifically handle the crosslinking and strength development, optimizing both sustainability and performance
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 significantly increasing the use of renewable starting materials, ensuring effective bonding from -60°C to +200°C.
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
hydrolysable alkoxysilane end groups... after a chemical crosslinking reaction performed in the presence of atmospheric moisture
Data Source
AI summary
Heat-curable adhesive composition:(a) a polyurethane composition (A) of formula:(i)in which R1 is a hydrocarbon-based radical; R2 is a polyester block; R3 is a linear C1-C3 alkylene radical; R4 and R5 are a C1-C4 alkyl; m is an integer such that the molar mass of the said polyurethanes is 900-27 000 Da; p=0, 1 or 2;obtained by producing polyester diols by polycondensation of:(i) dimerized fatty acids with an acid number of 190-200 mg KOH/g with a C2-C44 diol optionally having O or S; or(ii) dimerized fatty alcohols with a hydroxyl number of 200-220 mg KOH/g with a C4-C44 dicarboxylic acid optionally having O or S;(b) 22-62% of a compatible tackifying resin (B); and(c) 0.01-3% of a crosslinking catalyst (C). Self-adhesive support obtained by preheating the adhesive composition, coating onto a support layer and then curing. Manufacture of self-adhesive labels and/or tapes.