Heat-Crosslinked Polyurethane Adhesive One-Component Formulation
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Solution Overview
Problem
Current water-borne polyurethane adhesives require precise mixing ratios and short applicable periods, leading to quality incidents and environmental concerns, with slow initial bond strength and challenges in bonding profiled surfaces.
Innovation Solution
A heat-crosslinked polyurethane adhesive comprising a water-borne resin, physically blocked isocyanate curing agent, hydroxy polyurethane dispersion, chemically blocked isocyanate curing agent, catalyst, and water-based thickener, allowing for rapid curing and improved bonding properties, especially with porous fabrics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a two-component water-borne polyurethane adhesive system is used with isocyanate curing agents, then bonding strength and heat resistance are improved, but the complexity of preparation and risk of quality incidents increase due to precise mixing ratios and short applicable periods
Solution Approach 1:
The patent merges the water-borne polyurethane adhesive and water-borne isocyanate curing agent into a single one-component system. The adhesive contains pre-incorporated isocyanate groups that react with hydroxyl groups during heating and pressing, eliminating the need for separate component mixing while maintaining bonding strength and heat resistance.
Solution Approach 2:
The isocyanate curing agent is pre-incorporated into the adhesive formulation during manufacturing. This preliminary action ensures the correct stoichiometric ratio is maintained without requiring precise field mixing, and the adhesive remains stable during storage until activation by heat and pressure.
2Object-affected harmful factors
If water-borne polyurethane adhesive is used, then environmental friendliness is improved by eliminating volatile organic compounds, but aerosol generation during spraying requires additional ventilation equipment and causes water pollution
Solution Approach 1:
The patent changes the physical state and application parameters of the adhesive. By formulating a one-component system with optimized viscosity (1000-5000 cps) and applying it through coating rather than spraying, aerosol generation is minimized while maintaining environmental friendliness through water-based formulation.
3Stability of the object's composition
If activation temperature is maintained between 50-70°C for water-borne polyurethane, then storage stability is improved, but initial bond strength development is slow and profiled surface bonding fails due to rebound
Solution Approach 1:
The patent introduces dynamic temperature control during the bonding process. The adhesive is activated at elevated temperatures (90-110°C) during pressing to achieve rapid initial bond strength, then cooled to maintain stability. This dynamic approach allows fast curing without sacrificing storage stability.
Solution Approach 2:
The adhesive utilizes phase transition concepts by controlling the physical state changes during heating and cooling. The elevated temperature activates the isocyanate-hydroxyl reaction rapidly, while subsequent cooling stabilizes the bonded joint, preventing rebound on profiled surfaces.
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 solution enables stable storage and rapid curing under heat and pressure, enhancing initial bonding strength and heat resistance, while improving permeability to porous fabrics for diverse bonding applications.
Implementation Method 1
a heat-crosslinked polyurethane adhesive, which comprises the following components: 100 weight parts of a first waterborne resin; 8 to 12 weight parts of a first waterborne curing agent; 8 to 12 weight parts of a second waterborne resin; 4 to 10 weight parts of a second waterborne curing agent
Implementation Method 2
The synergistic cooperation of the first water-borne resin and the first water-borne curing agent exhibits rapid curing under heat and pressure
Implementation Method 3
rapid curing under heat and pressure, thereby enhancing the initial bonding properties
Implementation Method 4
0.04 to 0.1 weight parts of a catalyst
Data Source
AI summary
In this present, a heat-crosslinked polyurethane adhesive and a polyurethane adhesive film are invented, and the preparation method is disclosed. The heat-crosslinked polyurethane adhesive comprises the following components: 100 weight parts of a first water-borne resin; 8 to 12 weight parts of a first water-borne curing agent; 8 to 12 weight parts of a second water-borne resin; 4 to 10 weight parts of a second water-borne curing agent; 0.04 to 0.1 weight parts of a catalyst; 0.1 to 0.2 weight parts of a water-borne defoaming agent. Furthermore, a water-based thickener is added to this adhesive to adjust the viscosity to between 1000 and 5000 cps, allowing the product to be used conveniently and stored for an extended period of time at 25° C. or below.