Two-Part Acrylic-Epoxy Adhesive for Low Odor Bonding
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Solution Overview
Problem
Existing two-part adhesive compositions, particularly those based on acrylic and epoxy components, often exhibit obnoxious odors and toxicity, posing significant drawbacks for handling and use, and there is a need for alternatives that offer comparable or superior performance with favorable regulatory labeling.
Innovation Solution
A two-part adhesive composition comprising a first part with a (meth)acrylic component, a cure accelerator, a thermoplastic elastomer, and a reactive acid component, and a second part with an epoxy resin, benzoyl peroxide, and a plasticizer, which when mixed, provides a suitable bonding solution for metallic and polymeric materials, offering a balance of performance and regulatory compliance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylic-based adhesive compositions are used, then adhesive performance is achieved, but obnoxious odor and toxicity occur
Solution Approach 1:
The patent changes the chemical parameters of the adhesive system by using a two-part epoxy-acrylic composition with specific molecular structures. Part A contains acrylic monomers/oligomers with specific functional groups, while Part B contains epoxy resins with defined epoxide groups. This parameter change in chemical composition eliminates the harmful odors and toxicity associated with traditional acrylic adhesives while maintaining adhesive performance through controlled polymerization and crosslinking reactions.
2Strength
If two-part epoxy and acrylic adhesive composition is used, then bonding strength is improved, but formulation complexity increases
Solution Approach 1:
The adhesive system is segmented into two distinct parts with specific functions: Part A contains the acrylic component with initiators and Part B contains the epoxy component with crosslinking agents. This segmentation allows each part to be optimized independently for its specific role, simplifying the formulation development while achieving superior bonding strength through the synergistic interaction between the two parts upon mixing.
Solution Approach 2:
The invention creates a composite adhesive system combining epoxy resin and acrylic polymer components in a two-part formulation. This composite approach leverages the strengths of both material systems - the adhesion properties of acrylics and the structural strength and chemical resistance of epoxies - resulting in enhanced bonding performance while maintaining manageable formulation complexity through defined component ratios and curing mechanisms.
3Productivity
If fast curing is achieved, then productivity is improved, but open time is reduced
Solution Approach 1:
The curing process is made dynamic and controllable through the two-part system design. Upon mixing Part A and Part B, the curing reaction progresses at a controlled rate that can be adjusted by varying the composition ratios, temperature, and catalyst levels. This dynamic control allows optimization of both open time (for application and repositioning) and overall curing speed (for productivity), eliminating the need to choose between the two extremes.
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 a balance of performance and safety, with a suitable open time and fixture time, ensuring strong and consistent bonding while minimizing environmental and health hazards, as demonstrated by its application in laminating metallic and polymeric materials for handheld device assembly.
Implementation Method 1
a cure accelerator for the (meth)acrylic component of the first part
Implementation Method 2
a peroxide; and (iii) a metal compound which complexes with the strong acid component and which is substantially non-reactive with the peroxide
Implementation Method 3
An adhesive composition is provided that comprises
Data Source
AI summary
The present invention provides fast fixturing two part adhesive compositions which include a first part containing a (meth)acrylic component and a cure system for an epoxy resin component of the second part and a second part containing an epoxy resin component and a cure accelerator for the (meth)acrylic component of the first part.