Water-Based Plaster Isostearic Acid Crosslinking
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Solution Overview
Problem
The production of water-based plasters faces challenges in maintaining optimal gel strength and adhesiveness due to uneven spreading and exudation issues during the production process, particularly when using non-woven fabrics with high air permeability, which affects the quality and workability of the final product.
Innovation Solution
Incorporating a higher fatty acid with a viscosity of 1,000 mPa·s or more at room temperature as a crosslinking modifier in the water-based adhesive base, specifically using isostearic acid, to control crosslinking and prevent spread unevenness and exudation, while maintaining optimal adhesiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the crosslinking rate of the water-based adhesive base is not sufficiently adjusted, then the gel strength is insufficient, but the viscosity of the mixture rapidly increases in the kneading step causing spread unevenness
Solution Approach 1:
The patent applies preliminary action by adjusting the crosslinking rate during the kneading step before the spreading step. By controlling the crosslinking reaction to occur partially during mixing, the adhesive base achieves optimal gel strength before spreading, preventing both insufficient gelation and excessive viscosity increase that would cause spread unevenness.
Solution Approach 2:
The patent employs parameter changes by controlling the crosslinking rate through adjustment of crosslinking agent amount, mixing time, temperature, and pH conditions. These parameter modifications allow precise control over the degree of crosslinking, enabling the adhesive base to achieve the right balance between gel strength and spreadability.
2Object-affected harmful factors
If a support having a high air permeability such as a non-woven fabric is used, then the air permeability is improved, but the paste permeates the non-woven fabric and exudes from the back side in the aging step
Solution Approach 1:
The patent applies preliminary action by adjusting the crosslinking rate during the kneading step before the spreading step. By controlling the crosslinking reaction to occur partially during mixing, the adhesive base achieves optimal gel strength before spreading, preventing both insufficient gelation and excessive viscosity increase that would cause spread unevenness.
Solution Approach 2:
The patent employs parameter changes by controlling the crosslinking rate through adjustment of crosslinking agent amount, mixing time, temperature, and pH conditions. These parameter modifications allow precise control over the degree of crosslinking, enabling the adhesive base to achieve the right balance between gel strength and spreadability.
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 use of higher fatty acids with specific viscosity ensures uniform spreading, prevents paste exudation from non-woven fabrics, and enhances the adhesiveness of the water-based plaster, improving both production workability and final product quality.
Implementation Method 1
crosslinking reaction between a water-soluble polymer and a crosslinking agent
Implementation Method 2
the gel strength is higher and the spreading time is longer, gelation is promoted to remarkably increase the viscosity
Data Source
AI summary
Provided is a water-based plaster in which the gel strength is maintained to an appropriate level in a step of producing the water-based plaster, and particularly in a spreading step and an aging step, and a final preparation can exhibit an optimal adhesiveness for adhering to the skin. In the water-based plaster, a water-based adhesive base containing a water-soluble polymer as a main ingredient contains a higher fatty acid which is a liquid at room temperature and a viscosity of 1,000 (mPa·s, 20°C) or more as a crosslinking modifier. The higher fatty acid is isostearic acid, and the contained amount thereof is 1 to 10% by weight.