Repellent-Treated Prepregs to Reduce Adhesive Absorption and Weight
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Solution Overview
Problem
Existing prepregs and composite materials face challenges in reducing fluid absorption, which affects adhesive retention and bonding strength, and often require higher adhesive amounts and heavier substrates to achieve desired performance.
Innovation Solution
The development of prepregs and composite articles with a repellent treatment on surfaces, which decreases fluid absorption into open cell structures, allowing for reduced adhesive usage and lighter substrates while maintaining bonding strength, using thermoplastic materials and reinforcing fibers with repellent coatings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If repellent treatment is applied to decrease fluid absorption, then adhesive retention is improved, but adhesive application complexity increases
Solution Approach 1:
The repellent treatment is applied to the substrate surface before adhesive application, creating a pre-conditioned surface that controls fluid absorption. This preliminary action ensures that when adhesive is later applied, it remains on the surface long enough to achieve proper bonding without being immediately absorbed into the substrate, thereby improving adhesive retention while maintaining a straightforward application process.
2Quantity of substance
If adhesive amount is reduced, then material cost and weight are decreased, but bonding strength may be compromised
Solution Approach 1:
The repellent treatment acts as an intermediary layer between the substrate and the adhesive. It mediates the interaction by controlling the adhesive's behavior on the surface - preventing excessive absorption while ensuring adequate contact. This intermediary function allows for reduced adhesive quantities to achieve the same bonding strength, as the repellent treatment optimizes adhesive distribution and retention on the substrate surface.
3Weight of moving object
If substrate basis weight is reduced, then overall weight is decreased, but fluid absorption control becomes more difficult
Solution Approach 1:
Instead of treating the entire substrate uniformly, the repellent treatment is applied specifically to the bonding surfaces where fluid absorption control is critical. This local application allows the substrate to maintain lower overall basis weight while still achieving reliable fluid absorption control at the critical bonding interfaces. The rest of the substrate can remain lightweight without compromising bonding performance.
4Adaptability or versatility
If repellent treatment is applied, then temperature insensitivity is improved, but manufacturing process complexity increases
Solution Approach 1:
The repellent treatment modifies the surface parameters of the substrate to create a more stable interface for adhesive bonding. By changing the surface energy characteristics through repellent treatment, the system becomes less sensitive to temperature variations during bonding. This parameter modification allows for broader processing temperature windows without requiring complex temperature control systems, thereby improving temperature insensitivity while maintaining manufacturing simplicity.
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 repellent treatment enhances adhesive retention on surfaces, enabling the use of less adhesive by weight, reduces substrate basis weight, and improves bonding strength, while allowing for broader temperature and viscosity insensitivity, thus enhancing the performance and efficiency of composite materials.
Implementation Method 1
the repellent treatment effective to decrease absorption of a fluid into the open cell structure of the prepreg
Implementation Method 2
permitting the adhesive to wet the surface
Data Source
AI summary
Prepregs, cores and composite articles are described that comprise lighter weight materials and/or lower amounts of adhesive than commonly used. In some instances, one or more components of the articles may comprise a repellent material or repellent treatment to reduce the overall absorption rate of adhesive into the components of the article.