Two-Part Curable Adhesive Composition for Dissimilar Substrates
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Solution Overview
Problem
Existing acrylic-based adhesive compositions often exhibit obnoxious odors and toxicity, limiting their use, and fail to provide fast fixturing and good adhesion for dissimilar substrates like plastic and metal, necessitating improved alternatives.
Innovation Solution
A two-part curable composition comprising a (meth)acrylate component, 1,4-quinones, tri-aryl or alkylaryl phosphine, and a peroxide-based oxidant, which provides a suitable open time, fixture time, and shelf life for bonding dissimilar substrates such as PC/ABS and anodized aluminum, with specific weight percentages and additives to enhance stability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If existing acrylic-based adhesive compositions are used, then adhesion properties are achieved, but obnoxious odor and toxicity occur
Solution Approach 1:
The patent changes the chemical composition parameters by using (meth)acrylate components with specific functional groups and combining them with peroxide-based oxidants and metal catalysts, creating a new chemical system that achieves adhesion without the harmful properties of traditional acrylic adhesives
Solution Approach 2:
The invention creates a composite adhesive system combining multiple components: (meth)acrylate monomers or oligomers, peroxide-based oxidants, and metal catalysts, forming a multi-component curable composition that achieves both adhesion and safety requirements
2Productivity
If fast fixturing is achieved, then productivity improves, but open time becomes insufficient for proper bonding
Solution Approach 1:
The patent implements dynamic control of the curing process through a two-part system where the adhesive remains uncured and workable during application (open time), then rapidly cures upon mixing or activation (fixturing), achieving both sufficient working time and fast final set
Solution Approach 2:
The adhesive components are prepared separately in advance (Part A and Part B), allowing the user to mix them immediately before application. This preliminary separation maintains stability during storage while enabling fast curing once mixed, optimizing both open time and fixturing speed
3Stability of the object's composition
If extended shelf life is achieved through stable formulation, then storage stability improves, but reactivity during curing may be reduced
Solution Approach 1:
The patent divides the adhesive system into separate stable components (Part A containing (meth)acrylate and Part B containing peroxide and catalyst) that can be stored independently with extended shelf life, then combined to initiate rapid curing when needed
Solution Approach 2:
The formulation includes stabilizers and inhibitors in each part that prevent premature reaction during storage, cushioning against unwanted curing. These protective agents are consumed or deactivated upon mixing, allowing the curing reaction to proceed rapidly at the appropriate time
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 an open time of at least 2 minutes, a fixture time of less than 80 seconds at 40°C, and extended shelf life, forming a strong adhesive bond between diverse substrates with improved stability and handling characteristics.
Implementation Method 1
a two part curable composition... (i) a (meth)acrylate component;... (b) a second part comprising: (i) a peroxide-based oxidant...
Implementation Method 2
a tri-aryl or alkylaryl phosphine, such as triphenylphosphine in an amount greater than or equal to 0.5 weight percent
Implementation Method 3
1,4-quinones, such as naphthoquinone, anthroquinone or benzoquinone and derivatives thereof in an amount less than or equal to 0.05 weight percent
Data Source
AI summary
A two part curable composition is provided, where the composition comprises: (a) a first part comprising: (i) a (meth)acrylate component; (ii) 1,4-quinones, such as napthoquione or benzoquinone and derivatives thereof in an amount less than or equal to about 0.05 weight percent; (iii) triaryl or alkaryl phenylphosphine in an amount greater than or equal to about 0.5 weight percent; and (iv) an amine; and (b) a second part comprising: (i) benzoyl peroxide in an amount greater than about 1.0 weight percent.