Solventless Polyurethane Adhesive Fast Curing
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Solution Overview
Problem
Solventless laminating adhesives face issues such as short pot life, slow bond development, low adhesion to metal surfaces, and poor chemical and thermal resistance, particularly in high-performance applications like boil-in-bag packaging, limiting their operational efficiency and performance.
Innovation Solution
A two-component solventless polyurethane adhesive composition featuring an isocyanate component and an isocyanate-reactive component, where the amine-initiated polyol with tertiary amines and phosphate ester polyol are used to enhance reactivity, allowing for faster curing and improved bond strength, applied separately to substrates for immediate mixing and reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If solventless laminating adhesives are used, then environmental safety and health benefits are improved, but curing speed and bond development are worsened
Solution Approach 1:
The patent changes the chemical parameters of the adhesive system by using amine-initiated polyols with specific molecular weights and functionalities, along with phosphate ester polyols, to achieve fast curing rates while maintaining solventless formulation for environmental safety
Solution Approach 2:
The invention creates a composite adhesive system combining multiple polyol types (amine-initiated polyols, phosphate ester polyols, and additional polyols) with isocyanate components to achieve both fast curing and strong bond performance in solventless formulation
2Strength
If traditional two-component polyurethane adhesives are used, then adhesion to substrates is improved, but pot life is worsened
Solution Approach 1:
The patent applies adhesive components to substrates separately before bonding, allowing each component to be optimally positioned and then react immediately upon contact, achieving strong adhesion while maintaining extended pot life through controlled reaction timing
3Speed
If high reactivity adhesive composition is used, then curing speed is improved, but application flexibility is worsened
Solution Approach 1:
The patent divides the adhesive into two separate components applied to different substrates, allowing independent application and positioning before the components react upon contact, thus maintaining application flexibility while achieving fast curing through high reactivity of the individual 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 adhesive composition exhibits significantly faster curing rates and enhanced performance, enabling laminated structures to be slit within two hours and delivered within two days, with improved bond strength and thermal resistance, thus increasing operational efficiency and compliance with food contact regulations.
Implementation Method 1
The solventless adhesive composition includes an isocyanate component including an isocyanate and an isocyanate-reactive component including a highly-reactive amine-initiated polyol
Implementation Method 2
The adhesive composition is then curable, thereby bonding the first and second substrates
Data Source
AI summary
Two-component solventless polyurethane adhesive compositions are disclosed. In some embodiments, the solventless adhesive composition includes an isocyanate component including an isocyanate. The solventless adhesive composition further includes a isocyanate-reactive component including a highly-reactive amine-initiated polyol comprising two or more primary hydroxyl groups and a backbone incorporating tertiary amines. The isocyanate-reactive component further includes a phosphate ester polyol. The isocyanate-reactive component can further include one or more non-amine-initiated polyols. Methods for forming a laminate structure are also disclosed, comprising uniformly applying an isocyanate component to a first substrate, uniformly applying a isocyanate-reactive component to a second substrate, bringing the first and second substrates together, thereby mixing and reacting the isocyanate component and the isocyanate-reactive component to form an adhesive between the first and second substrates, and curing the adhesive to bond the first and second substrates. Still further, laminates comprising the adhesive compositions are disclosed.