Magnetically Curable Adhesive via Magnetostrictive Microsphere Rupture
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Solution Overview
Problem
Existing curable compositions that rely on thermal interaction to release encapsulated curing agents are unsuitable for temperature-sensitive applications and may damage components or substrates due to heat generation.
Innovation Solution
A magnetically curable composition featuring magnetically active microspheres with magnetostrictive properties, encapsulating a curing agent, which can be ruptured by a magnetic field without significant temperature increase, allowing for controlled release of the curing agent into a resin, thereby initiating the curing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal interaction is used to release encapsulated curing agent, then the curing process can be initiated, but temperature-sensitive applications are compromised and components or substrates may be damaged due to heat generation
Solution Approach 1:
The patent replaces the thermal field (heat) with a magnetic field to initiate the curing process. Magnetically active microspheres containing curing agents are introduced into the adhesive composition. When a magnetic field is applied, these microspheres experience magnetostrictive forces that cause them to rupture and release the curing agents, thereby initiating polymerization without generating harmful heat. This substitution of thermal interaction with magnetic interaction resolves the contradiction between reliable curing initiation and prevention of heat damage to temperature-sensitive components.
Solution Approach 2:
The patent changes the activation parameter from temperature (thermal field) to magnetic field strength. By using magnetically active microspheres with controlled magnetostrictive properties, the curing process can be initiated by applying a magnetic field of sufficient strength to rupture the microspheres but not strong enough to cause excessive heating. This parameter change allows precise control over curing initiation while avoiding the harmful thermal effects that limit applications of conventional thermal curing methods.
2Reliability
If physical shearing or crushing force is applied to rupture microspheres, then the curing agent can be released, but the adhesive material undergoes unwanted physical deformation
Solution Approach 1:
The patent replaces mechanical shearing or crushing forces with a magnetic field to rupture the microspheres and release the curing agent. The magnetically active microspheres respond to the applied magnetic field through magnetostriction, causing internal stresses that rupture the microsphere walls without requiring external mechanical deformation of the adhesive. This substitution preserves the shape and positioning of the adhesive material while achieving reliable curing agent release.
3Stability of the object's composition
If conventional encapsulated curing agents are used, then the adhesive remains stable during application, but the curing process cannot be initiated at a desired time without external stimulation
Solution Approach 1:
The patent introduces magnetically active microspheres as an intermediary between the adhesive composition and the curing initiation process. These microspheres remain dormant and do not interfere with adhesive stability during application. When curing is desired, an external magnetic field acts as a non-invasive stimulus that triggers the microspheres to rupture and release the curing agents. This intermediary system provides precise control over curing initiation timing without compromising adhesive stability during storage and application.
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
Enables the initiation of the curing process at a desired time without physical shearing or heating, maintaining the adhesive and substrates at a stable temperature, and allowing for precise control over the release of the curing agent through adjustable magnetic fields.
Implementation Method 1
magnetically responsive particles, wherein said magnetically active microspheres are elastic and capable of magnetostrictive distortion sufficient to rupture the microsphere and release the curing agent when exposed to a magnetic field
Data Source
AI summary
A curable composition comprising magnetically active elastic microspheres that are filled with a curing agent. The elastomeric microspheres are predispersed throughout the curable resin and are magnetostrictive. Cure of the adhesive is initiated when an external magnetic field is applied that physically distorts or ruptures the magnetic microspheres due to a magnetostrictive effect from the magnetic field.