Accelerated Cure Adhesive for Acoustic Stack Bonding
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Solution Overview
Problem
Traditional acoustic sensor array manufacturing is costly due to high cycle times, equipment requirements, and high scrap rates, primarily driven by the use of high viscosity adhesives that require long curing cycles, leading to defects such as starved bondlines, poor adhesion, and sensitivity failures.
Innovation Solution
The use of an accelerated cure adhesive comprising modified epoxy resins like epoxy phenol novolac, bisphenol A, and bisphenol F, which cures quickly, reducing cycle time and improving bond strength and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional high viscosity adhesives are used for laminating acoustic stack components, then adequate bond strength can be achieved, but the curing cycle time becomes excessively long (3-24 hours)
Solution Approach 1:
The patent modifies the adhesive composition by using low viscosity adhesives with specific rheological parameters that enable rapid curing. The adhesive viscosity is controlled to be below 1000 cps at room temperature, and the cure kinetics are optimized to achieve full cure in minutes rather than hours, directly resolving the contradiction between bond strength and curing time
Solution Approach 2:
The patent employs composite adhesive formulations that combine low viscosity base materials with specific crosslinking agents and accelerators. This composite approach maintains adequate bond strength while enabling rapid cure cycles, as the composite formulation allows for optimized rheological and mechanical properties simultaneously
2Reliability
If long curing cycles are used with traditional adhesives, then complete adhesion can be achieved, but production costs increase due to equipment requirements and scrap rates
Solution Approach 1:
The patent implements rapid cure adhesives that skip the prolonged curing phase of traditional adhesives. The adhesive formulation includes accelerators and optimized crosslinking chemistry that enables complete adhesion in minutes, allowing production to rush through the curing step without compromising bond quality, thereby reducing equipment time requirements and production costs
Solution Approach 2:
The patent replaces the time-intensive thermal curing process with accelerated cure mechanisms that use chemical accelerators and optimized reaction kinetics. This substitution reduces reliance on extended thermal processing equipment and reduces overall cycle time, lowering production costs while maintaining adhesion quality
3Strength
If traditional adhesives are used, then adequate bonding can be achieved, but defects such as starved bondlines, poor adhesion, and sensitivity failures occur due to long curing times
Solution Approach 1:
The patent optimizes adhesive parameters including viscosity (below 1000 cps), cure rate, and crosslinking density to prevent defect formation. The low viscosity ensures proper flow and wetting before cure, while the accelerated cure kinetics prevent starved bondlines and ensure uniform adhesion, directly reducing the defect rate while maintaining bonding quality
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
This approach significantly reduces production time and costs by achieving a 70-90% decrease in cycle time, minimizing defects, and enhancing mechanical and electrical connectivity, resulting in improved acoustic stack performance.
Implementation Method 1
an accelerated cure adhesive, which comprises an epoxy resin. The epoxy resin comprises one or more modified epoxy resins
Data Source
AI summary
An acoustic stack is described, where the acoustic stack comprises a plurality of acoustic stack components, which are laminated with an accelerated cure adhesive, which comprises an epoxy resin. The epoxy resin comprises one or more modified epoxy resins, which are selected from a group consisting of epoxy phenol novolac, bisphenol A, and bisphenol F. Further described is a method for producing an acoustic stack. The method comprises providing a plurality of acoustic stack components and dispensing an accelerated cure adhesive to the acoustic stack components. The accelerated cure adhesive dispensed on, to, and/or in the acoustic stack components includes an epoxy resin, which comprises at least one modified epoxy resin selected from a group consisting of epoxy phenol novolac, bisphenol A, and bisphenol F. After the accelerated cure adhesive is dispensed to the acoustic stack components, the accelerated cure adhesive is cured.