Multi-layer adhesive composite for body waste collection
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Solution Overview
Problem
Adhesives used for attaching body waste collecting devices to the skin face a challenge in maintaining bonding properties after moisture absorption, as hydrocolloid-based adhesives swell and reduce skin adhesion, and existing solutions either compromise on moisture permeability or fail to address the issue of hydrocolloid particles being washed out by perspiration.
Innovation Solution
A three-layer adhesive composite with a low-absorbing, liquid impermeable, moisture permeable skin-facing layer, a moisture-absorbing layer, and a backing layer, where the skin-facing layer transports moisture away from the skin-adhesive interface, maintaining adhesive properties even after significant moisture absorption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrocolloid-based adhesive absorbs moisture from the skin, then the skin remains relatively dry, but the adhesive bonding strength decreases
Solution Approach 1:
The adhesive is divided into two functional layers: a hydrophilic absorbing layer containing hydrocolloid particles for moisture absorption, and a hydrophobic skin-bonding layer for maintaining adhesive strength. This segmentation allows each layer to perform its specific function without interfering with the other, resolving the contradiction between moisture absorption and bonding strength
Solution Approach 2:
Different regions of the adhesive have different properties: the inner layer is hydrophilic and moisture-absorbing, while the outer layer is hydrophobic and skin-bonding. This local differentiation of material properties enables the adhesive to simultaneously absorb moisture internally while maintaining strong bonding at the skin interface
2Object-affected harmful factors
If the adhesive is made moisture permeable to keep skin dry, then moisture can evaporate, but adhesive bonding is reduced
Solution Approach 1:
The adhesive structure is segmented into a moisture-absorbing hydrophilic layer and a bonding-oriented hydrophobic layer, allowing moisture permeability functions to be separated from bonding functions, thus maintaining both skin dryness and adhesive strength
Solution Approach 2:
The adhesive uses a composite structure combining hydrophilic and hydrophobic materials with complementary properties. The hydrophilic phase provides moisture absorption and permeability, while the hydrophobic phase provides skin bonding, creating a composite material that achieves both contradictory requirements
3Ease of operation
If small drops of moisture are formed between skin and adhesive, then active perspiration occurs, but hydrocolloid particles are washed out reducing bonding
Solution Approach 1:
The hydrophobic skin-bonding layer acts as an intermediary barrier between the skin and the hydrocolloid particles. This intermediary layer prevents direct contact between moisture droplets and hydrocolloid particles, stopping the washing out effect while still allowing the hydrocolloid layer to absorb moisture vapor
Solution Approach 2:
The hydrophobic bonding layer provides preliminary protection by preventing moisture droplets from reaching and washing away the hydrocolloid particles before they can be washed out, thus preemptively maintaining adhesive integrity
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 solution significantly increases the peel force of the adhesive after exposure to water, maintaining adhesion while allowing for effective moisture absorption, reducing the risk of hydrocolloid particles being washed out and maintaining skin dryness.
Implementation Method 1
a skin facing layer of a low-absorbent, liquid impermeable, moisture permeable adhesive composition
Implementation Method 2
a moisture absorbing layer
Data Source
AI summary
A body waste collecting device comprising an adhesive composite that fastens a collecting bag to the skin is disclosed. The adhesive composite is highly moisture resistant while still being water absorbing. The adhesive composite comprises at least three layers, a backing layer, a moisture absorbing layer and a thin layer of vapor permeable, low-absorbing adhesive layer.