Two-Component Urethane Adhesive Viscosity Control
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Solution Overview
Problem
Conventional one-component moisture-curable urethane compositions used for automobile body glazing have slow curing speeds, which can lead to compromised adhesion and heat resistance when switched to two-component systems, and excessive viscosity issues in two-component urethane-based adhesive compositions.
Innovation Solution
A two-component urethane-based adhesive composition is developed, incorporating a urethane prepolymer with an isocyanate group, a curing agent with active hydrogen-containing groups, and microparticles with an organic polymer dispersed in a polyoxyalkylene polyol, along with an isocyanurate of pentamethylene diisocyanate to maintain curing speed, adhesion, and heat resistance while controlling viscosity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a two-component urethane-based adhesive composition is used to enhance curing speed, then curing speed is improved, but adhesion to base material and heat resistance may be deteriorated
Solution Approach 1:
The patent uses a composite adhesive system combining urethane prepolymer with polyisocyanate and trimerized hexane-1,6-diisocyanate in specific ratios. This composite composition achieves both fast curing speed and maintained adhesion/heat resistance by leveraging the complementary properties of different urethane components rather than relying on a single formulation
Solution Approach 2:
The patent optimizes specific parameters including the ratio of urethane prepolymer to polyisocyanate (0.3 to 2.0), the content of trimerized hexane-1,6-diisocyanate (5 to 50 parts by mass per 100 parts by mass of urethane prepolymer), and viscosity control (50 to 5000 mPa·s). These parameter adjustments enable the adhesive to achieve fast curing while maintaining reliability
2Speed
If trimerized hexane-1,6-diisocyanate is added to two-component urethane-based adhesive composition, then curing speed is improved, but viscosity may be increased excessively, causing deterioration in workability
Solution Approach 1:
The patent precisely controls the content of trimerized hexane-1,6-diisocyanate within 5 to 50 parts by mass per 100 parts by mass of urethane prepolymer, and maintains the viscosity of the two-component adhesive composition within 50 to 5000 mPa·s. This parameter optimization ensures that curing speed is enhanced without excessive viscosity increase that would impair workability
Solution Approach 2:
The patent introduces microparticles (average particle diameter 0.1 to 10 μm) as a localized component within the adhesive composition. These microparticles provide specific functional benefits (adhesion enhancement, viscosity control) without uniformly affecting the entire adhesive system's flow properties, thus maintaining workability while improving 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 excellent curing speed, workability, adhesion, and heat resistance while preventing excessive viscosity, making it suitable for olefin-based resin materials and improving the adhesive's performance in high-temperature environments.
Implementation Method 1
a main agent containing a urethane prepolymer (A) having an isocyanate group; and a curing agent containing a compound (B) having at least two active hydrogen-containing groups in each molecule
Implementation Method 2
microparticles (D) containing organic matter and having an average particle diameter of 0.1 to 10 μm
Data Source
AI summary
The present technology provides a two-component urethane-based adhesive composition that contains: a main agent containing a urethane prepolymer (A) having an isocyanate group; and a curing agent containing a compound (B) having at least two active hydrogen-containing groups in each molecule. At least one of the main agent or the curing agent contains a compound (C) having an isocyanurate ring, and microparticles (D) containing organic matter and having an average particle diameter of 0.1 to 10 μm; and the compound (C) contains an isocyanurate of pentamethylene diisocyanate.