Two-Component Acrylic Adhesive for Autonomous Curing and Foaming
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Solution Overview
Problem
Existing adhesives require external stimuli like heat or UV light for curing and do not efficiently foam, limiting their application in structural reinforcement and noise dampening in vehicles and transportation.
Innovation Solution
A two-component acrylic adhesive that autonomously cures and foams upon mixing, utilizing a binary chemical foaming agent to synchronize curing and foaming reactions without external heat, suitable for structural reinforcement and noise dampening in vehicles and transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external stimuli like heat or UV light are used for curing, then the adhesive can achieve proper curing, but the process requires additional equipment and energy input
Solution Approach 1:
The adhesive system uses self-contained chemical components (peroxide initiator in one component, curative in the other) that enable autonomous curing upon mixing without external heat or UV light, eliminating the need for additional curing equipment and energy input while maintaining reliable curing effectiveness
Solution Approach 2:
The curing system is divided into two separate components: Component A contains the peroxide initiator and Component B contains the curative. This segmentation allows the adhesive to remain stable during storage and only initiate curing when the two components are mixed, enabling simple application without complex external curing equipment
2Quantity of substance
If chemical foaming agents are used, then the adhesive can foam effectively, but the foaming process may interfere with the curing reaction
Solution Approach 1:
The foaming system is segmented into two separate components: Component A contains the carbonate foaming agent and Component B contains the acid. This segmentation prevents premature foaming during storage and application, and ensures that foaming occurs simultaneously with curing only after mixing, eliminating interference between foaming and curing processes
Solution Approach 2:
The formulation ensures continuous and synchronized action of both foaming and curing reactions after mixing. The acid-catalyzed decomposition of carbonate generates CO2 continuously while the peroxide-initiated polymerization proceeds simultaneously, creating a stable foam structure throughout the curing process without one reaction interfering with the other
3Productivity
If fast-curing adhesive is used, then the cycle time is reduced, but the adhesive may not have sufficient time to foam properly
Solution Approach 1:
The formulation uses specific parameters: 1-10 wt% peroxide initiator for fast curing, 5-20 wt% carbonate for adequate foaming, and acid value of 2-10 mg KOH/g for controlled reaction rate. These parameter combinations enable both fast curing and sufficient foaming to occur simultaneously within the same time frame, resolving the contradiction between curing speed and foam expansion
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 provides fast-curing, toughened, primerless adhesion to metals and composites, minimizing cycle times and odor, with controlled foaming for effective structural bonding and noise dampening.
Implementation Method 1
a binary chemical foaming agent which releases gas when a first constituent is mixed with a second constituent
Implementation Method 2
a polymerization initiator; wherein mixing the first component and the second component with one another induces the formation of a cured foamed acrylic adhesive
Implementation Method 3
The adhesive provides fast-curing, toughened, primerless adhesion to metals and composites
Data Source
AI summary
The invention relates to an autonomously curable and foamable two-component acrylic adhesive that upon combining the two components with one another spontaneously foams and cures thereby forming a cured foamed acrylic adhesive. The cured foamed acrylic adhesive may have utility as structural adhesive, sealant, noise dampening material and the like. The cured foamed acrylic adhesive is particularly useful for structural reinforcement within cavities of structural elements, e.g. of automotive vehicles, aircrafts, railway carriers, or other means of transportation.