One-Pack Moisture-Curing Adhesive for Vehicle Glass
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Solution Overview
Problem
One-pack moisture-curing urethane compositions used in vehicle manufacturing face challenges in adhering glass adherends to poorly adhesive coated surfaces without surface treatment, while also requiring high flow resistance, heat-resistant adhesiveness, and breaking elongation.
Innovation Solution
A one-pack moisture-curing composition comprising a urethane prepolymer with isocyanate groups, carbon black, an adhesiveness-imparting agent obtained from reacting diisocyanate and trimethylolpropane or glycerin, a first catalyst from 1,3-diacetoxy-1,1,3,3-tetrabutyldistannoxane and ethyl silicate, and a second catalyst including dimorpholinodiethylether, with specific mass ratios to ensure excellent adhesiveness and performance characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional one-pack moisture-curing urethane compositions are used, then the composition can be applied without primer, but the adhesiveness to poorly adhesive coated surfaces is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters by introducing specific adhesiveness-imparting agents (polyisocyanates with NCO content of 10-30% and compounds with active hydrogen such as carboxylic acids, alcohols, or amines) in controlled amounts (0.1-5 parts by mass per 100 parts urethane prepolymer). This compositional parameter change enables direct adhesion to poorly adhesive coated surfaces while maintaining the one-pack moisture-curing formulation simplicity.
2Strength
If adhesiveness-imparting agents are added to improve adhesion to coated surfaces, then adhesiveness improves, but flow resistance deteriorates
Solution Approach 1:
The patent precisely controls the quantity parameters of adhesiveness-imparting agents, limiting polyisocyanates to 0.1-5 parts by mass and compounds with active hydrogen to 0.1-3 parts by mass per 100 parts urethane prepolymer. This quantitative control maintains adequate flow resistance while achieving sufficient adhesiveness to coated surfaces.
Solution Approach 2:
The patent creates a composite formulation combining urethane prepolymer with specifically selected adhesiveness-imparting agents (polyisocyanates and compounds with active hydrogen). This composite material approach synergistically improves adhesiveness while the controlled composition maintains flow resistance characteristics.
3Strength
If the composition is formulated for high adhesiveness, then adhesion improves, but heat-resistant adhesiveness and breaking elongation are compromised
Solution Approach 1:
The patent optimizes multiple compositional parameters simultaneously: urethane prepolymer with specific NCO content (1.5-3.0%), controlled amounts of adhesiveness-imparting agents (polyisocyanates 0.1-5 parts, compounds with active hydrogen 0.1-3 parts), and carbon black content (10-120 parts). This multi-parameter optimization achieves high adhesiveness while maintaining heat-resistant adhesiveness and breaking elongation.
Solution Approach 2:
The patent formulates a composite material system integrating urethane prepolymer, adhesiveness-imparting agents, and carbon black. This composite structure provides both high adhesiveness to coated surfaces and maintained thermal stability and elasticity through the synergistic combination of components.
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 excellent adhesiveness to poorly adhesive surfaces without surface treatment, while maintaining high flow resistance, heat-resistant adhesiveness, and breaking elongation, making it suitable for vehicle applications.
Implementation Method 1
One-pack moisture-curing composition comprising: a preliminary composition containing a urethane prepolymer having isocyanate groups at the terminals
Implementation Method 2
a first catalyst containing a compound (C) obtained by reacting 1,3-diacetoxy-1,1,3,3-tetrabutyldistannoxane and ethyl silicate at a molar ratio within a range of from 1:0.8 to 1:1.2 and/or dibutyltin bis(pentadione); and a second catalyst containing dimorpholinodiethylether
Implementation Method 3
a preliminary composition containing a urethane prepolymer having isocyanate groups at the terminals and carbon black
Data Source
AI summary
A one-pack moisture-curing composition of the present technology contains a preliminary composition, an adhesiveness-imparting agent containing a compound (A) and/or a compound (B), a first catalyst containing a compound (C) and/or dibutyltin bis(pentadione), and a second catalyst containing a dimorpholinodiethylether.