Liquid-Repellent Structure with Acid-Modified Polyolefin Foundation
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Solution Overview
Problem
Conventional liquid-repellent structures experience a decrease in liquid repellency over time due to insufficient adhesion between the liquid-repellent layer and the surface, leading to detachment of fine particles.
Innovation Solution
A liquid-repellent structure is developed with a foundation layer containing acid-modified polyolefin and a liquid-repellent layer featuring a fluorine-containing resin with hydrophilic structural units, such as amino or amide groups, which enhances adhesion and maintains excellent liquid repellency for a longer duration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fluorine-containing resin with perfluoroalkyl group is used in the liquid-repellent layer, then liquid repellency is improved, but adhesion between the liquid-repellent layer and the surface deteriorates
Solution Approach 1:
The patent introduces a foundation layer containing acid-modified polyolefin as an intermediary between the substrate and the liquid-repellent layer. This foundation layer has both adhesion to the substrate and compatibility with the fluorine-containing resin, thereby mediating the conflict between adhesion and liquid repellency. The acid-modified polyolefin provides carboxyl groups that enhance bonding while allowing the fluorine-containing resin to maintain its liquid-repellent properties.
Solution Approach 2:
The patent creates a composite structure consisting of multiple layers with different functions: the foundation layer (acid-modified polyolefin) provides adhesion, while the liquid-repellent layer (fluorine-containing resin) provides liquid repellency. This composite material approach allows each layer to optimize its specific function without compromising the other, resolving the contradiction between adhesion strength and liquid repellency performance.
2Reliability
If conventional liquid-repellent structures are used, then initial liquid repellency is sufficient, but liquid repellency decreases over time
Solution Approach 1:
The patent applies preliminary action by forming the foundation layer containing acid-modified polyolefin before applying the liquid-repellent layer. This foundation layer is prepared in advance to ensure strong adhesion, preventing subsequent detachment of the liquid-repellent layer and fine particles. The preliminary formation of this adhesive foundation ensures long-term durability of the liquid repellency effect.
Solution Approach 2:
The foundation layer acts as a cushioning layer prepared in advance to prevent potential detachment issues. By providing a strong adhesive foundation before the liquid-repellent layer is applied, it cushions against the risk of adhesion failure that would otherwise cause the liquid repellency to deteriorate over time.
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 structure achieves improved and sustained liquid repellency by strengthening the adhesion between the foundation and liquid-repellent layers, effectively preventing detachment and maintaining performance even with highly viscous liquids containing surfactants.
Implementation Method 1
the fluorine-containing resin contains a hydrophilic structural unit having at least one of an amino group and an amide group
Implementation Method 2
for a liquid-repellent layer containing a fluorine-containing resin having a perfluoroalkyl group (Rf group), its low surface energy due to the Rf group makes it difficult to increase the adhesion between the liquid-repellent layer and a surface
Implementation Method 3
the strong adhesion between the foundation layer and the liquid-repellent layer is exhibited by the interaction between the acid-modified part of the acid-modified polyolefin contained in the foundation layer and a hydrophilic structural unit of the fluorine-containing resin contained in the liquid-repellent layer
Data Source
AI summary
A liquid-repellent structure includes a surface to which liquid repellency is to be imparted; a foundation layer having a surface and disposed to face the surface to which liquid repellency is to be imparted; and a liquid-repellent layer disposed to face the surface of the foundation layer, wherein the foundation layer contains an acid-modified polyolefin, the liquid-repellent layer contains a fluorine-containing resin and particles, and the fluorine-containing resin contains a hydrophilic structural unit having at least one of an amino group and an amide group. A packaging material has the liquid-repellent structure disposed to face a product. The packaging material can also be applied to a product that is a selected one of hand soap, body soap, shampoo, rinse, creams, and cosmetics and that contains a surfactant.