Reactive Hot-Melt Adhesive With Polyester Polyol For Thermal Strength
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Solution Overview
Problem
Reactive hot-melt adhesives currently lack sufficient thermal adhesive strength and durability, particularly when exposed to high temperatures or water over extended periods.
Innovation Solution
A reactive hot-melt adhesive comprising a urethane prepolymer formed from a polyol and polyisocyanate, including bifunctional polyols like polypropylene glycol and polyethylene glycol, a trifunctional polyol, and a polyester polyol with a glass transition temperature between 20 to 60°C, combined with a thermoplastic poly(meth)acrylic resin, which provides a tacky and crosslinked network for enhanced adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a reactive hot-melt adhesive is prepared without a polyester polyol or a trifunctional polyol, then the adhesive can be manufactured with simplified components, but the thermal adhesive strength and durability are insufficient
Solution Approach 1:
The patent changes the glass transition temperature parameter of the polyester polyol to a specific range (20-60°C) to optimize both processability and final adhesive performance. This parameter optimization allows the adhesive to maintain good flow characteristics during application while achieving high thermal adhesive strength and durability after curing
Solution Approach 2:
The patent creates a composite adhesive system combining urethane prepolymer with specific polyol components (including polyester polyol with controlled Tg) and thermoplastic poly(meth)acrylic resin. This composite formulation synergistically improves both manufacturability and reliability, achieving high thermal adhesive strength (≥2.0 MPa at 80°C) and durability while maintaining ease of application
2Duration of action of moving object
If the adhesive is exposed to high temperature or water for a long period, then the adhesive undergoes durability testing to simulate real-world conditions, but the adhesion strength decreases
Solution Approach 1:
The patent incorporates specific polyol components with controlled glass transition temperatures as a preventive measure against future degradation. The polyester polyol with Tg of 20-60°C acts as a buffer that maintains the adhesive's flexibility and bonding strength during prolonged exposure to high temperature and water, preventing adhesion loss before it occurs
Solution Approach 2:
By optimizing the glass transition temperature parameter of the polyester polyol component, the adhesive maintains optimal molecular mobility and chain flexibility across a wide temperature range. This parameter control ensures the adhesive retains its bonding strength even after prolonged exposure to harsh environmental conditions
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 adhesive achieves high thermal adhesive strength and excellent durability, maintaining adhesion under high-temperature and water exposure conditions.
Implementation Method 1
a polyester polyol having a glass transition temperature of from 20 to 60° C.
Implementation Method 2
a urethane prepolymer formed from a polyol and a polyisocyanate
Implementation Method 3
a thermoplastic poly (meth)acrylic resin
Data Source
AI summary
The present technology provides a reactive hot-melt adhesive including a urethane prepolymer formed from a polyol and a polyisocyanate; and a thermoplastic poly (meth)acrylic resin; the polyol including a bifunctional polyol including polypropylene glycol and polyethylene glycol, a trifunctional polyol, and a polyester polyol having a glass transition temperature of from 20 to 60° C.