Aqueous Adhesive Formulation for Polyolefin Bonding
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Solution Overview
Problem
Conventional water-based vacuum-forming laminating adhesive compositions fail to provide sufficient adhesion of thermoplastic materials to rigid polyolefin substrates, which are lower in surface energy, and often require expensive and limited polychloroprene, while also lacking heat and humidity resistance.
Innovation Solution
An aqueous-based adhesive composition incorporating minimal polychloroprene, with tackifying resin and rubber latex, along with a high heat resistance polyurethane polymer dispersion, to enhance adhesion and maintain heat and humidity resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional water-based laminating adhesive compositions are used, then the adhesive composition is environmentally friendly and easy to handle, but the adhesion to polyolefin substrates is insufficient
Solution Approach 1:
The patent combines multiple adhesive components (polychloroprene emulsion, adhesion promoting agent, polyurethane polymer dispersion, tackifying resin dispersion, and rubber latex dispersion) to create a composite adhesive formulation that achieves both environmental friendliness and strong adhesion to polyolefin substrates
Solution Approach 2:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific adhesion promoting agents and adjusting the ratios of different polymer components to enhance adhesion to low-surface-energy polyolefin substrates while maintaining water-based environmental benefits
2Strength
If polychloroprene is used to improve adhesion to polyolefin substrates, then adhesion performance is enhanced, but the cost increases and supply becomes limited
Solution Approach 1:
The patent merges polychloroprene emulsion with other adhesive components (adhesion promoting agents, polyurethane polymers, tackifying resins, and rubber latex) to create a synergistic formulation that reduces dependence on large quantities of polychloroprene while maintaining adhesion performance
Solution Approach 2:
The patent incorporates cheaper alternative components such as adhesion promoting agents and rubber latex dispersions that can partially replace expensive polychloroprene, reducing overall material cost and supply dependency
3Strength
If tackifying resin and rubber latex are incorporated to improve adhesion, then adhesion characteristics are enhanced, but heat resistance property deteriorates
Solution Approach 1:
The patent carefully controls the composition parameters of tackifying resin and rubber latex within specific weight ranges (0.5-40% and 5-98.5% respectively) to optimize the balance between adhesion characteristics and heat resistance, preventing excessive softening at elevated temperatures
Solution Approach 2:
The patent creates a composite adhesive system where polyurethane polymer dispersion with high crossover temperature (≥65°C, preferably ≥140°C) compensates for the heat-sensitive nature of tackifying resin and rubber latex, maintaining overall heat resistance while benefiting from enhanced adhesion
4Strength
If adhesion promoting agents are added to enhance bonding to polyolefin substrates, then adhesion performance improves, but the composition complexity increases
Solution Approach 1:
The patent optimizes the concentration of adhesion promoting agents within specific ranges (0.5-25% by weight) to achieve effective adhesion enhancement while avoiding excessive formulation complexity and maintaining ease of application
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 adhesion to polyolefin substrates, passing adhesion testing standards like Toyota Creep Test Specification F7754G, while minimizing polychloroprene usage and maintaining heat and humidity resistance.
Implementation Method 1
polyurethane polymer dispersions having a crossover temperature of at least 65° C., and preferably at least 140° C.
Implementation Method 2
adhesive composition which provides excellent adhesion of thermoplastic materials to rigid polyolefin substrates
Data Source
AI summary
An aqueous adhesive composition comprising a polychloroprene emulsion; an adhesion promoting agent that promotes adhesion to polyolefin substrates; a polyurethane polymer dispersion; an aqueous tackifying resin dispersion; and a rubber latex dispersion. A multi-layer composite and methods for adhering a thermoplastic material to a rigid substrate using the aqueous adhesive composition also are described.