Cooling Sheet Adhesive Composition for High-Water Stable Cooling
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Solution Overview
Problem
Conventional cooling sheets with water-soluble polymers and water in the adhesive layer face issues such as liner displacement, seepage, insufficient adhesion strength, and bacterial/mold growth due to high water content and mass, which hinder effective cooling performance.
Innovation Solution
Incorporating polyalkylene glycol monooleate as a surfactant, polyvinyl alcohol and polyacrylic acid as water-soluble polymers, and parahydroxybenzoate as an antiseptic in specific ratios within the adhesive layer, allowing for high water content and mass without liner displacement, seepage, and preventing mold and bacterial growth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the water content and mass of the adhesive agent layer are increased to enhance cooling performance, then cooling power and cooling duration are improved, but liner displacement and seepage occur
Solution Approach 1:
The patent optimizes the water content parameter to 65-85% by mass and the adhesive agent layer mass to 1000-2000 g/m2, which provides sufficient cooling performance while preventing liner displacement and seepage. This specific parameter range resolves the contradiction by finding the optimal balance point.
Solution Approach 2:
The adhesive agent layer uses a composite formulation containing water-soluble polymers (polyvinyl alcohol, polyacrylic acid), surfactants (polyalkylene glycol monooleate), and antiseptics (parahydroxybenzoate). This composite material structure enables high water content while maintaining structural integrity and preventing liner displacement.
2Temperature
If the water content and mass of the adhesive agent layer are increased to enhance cooling performance, then cooling power and cooling duration are improved, but adhesion strength becomes insufficient
Solution Approach 1:
The patent specifies optimal ranges for water content (65-85%) and adhesive agent layer mass (1000-2000 g/m2) that simultaneously achieve high cooling performance and sufficient adhesion strength. The balanced formulation prevents the adhesion strength from becoming insufficient.
Solution Approach 2:
The composite adhesive agent layer combines water-soluble polymers for adhesion, surfactants for stability, and antiseptics for preservation. This composite structure maintains strong adhesion even with high water content, resolving the contradiction between cooling performance and adhesion strength.
3Temperature
If the water content of the adhesive agent layer is increased to enhance cooling performance, then cooling power is improved, but bacterial and mold growth occurs during long-term storage
Solution Approach 1:
The patent incorporates parahydroxybenzoate as an antiseptic that converts the harmful effect of high water content (promoting microbial growth) into a beneficial outcome by actively preventing bacterial and mold growth. The antiseptic transforms the risk associated with high water content into a controlled environment that maintains safety during long-term storage.
Solution Approach 2:
The adhesive agent layer uses a composite formulation that includes antiseptics (parahydroxybenzoate) specifically to counteract the microbial growth risk from high water content. This composite approach allows the formulation to maintain 65-85% water content for excellent cooling power while the antiseptic component prevents bacterial and mold growth during storage.
4Duration of action of moving object
If the mass of the adhesive agent layer is increased to enhance cooling duration, then cooling duration is improved, but seepage into the backing layer occurs
Solution Approach 1:
The patent optimizes the adhesive agent layer mass to 1000-2000 g/m2, which provides sufficient cooling duration while preventing seepage into the backing layer. This parameter optimization resolves the contradiction by establishing the ideal mass range.
Solution Approach 2:
The composite adhesive agent layer formulation with water-soluble polymers, surfactants, and antiseptics creates a stable structure that can maintain higher mass (1000-2000 g/m2) for extended cooling duration without causing seepage into the backing layer.
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 ensures high adhesion strength, suppresses liner displacement and seepage, and effectively prevents mold and bacterial growth over a long period, enhancing cooling performance.
Implementation Method 1
when a predetermined amount of polyalkylene glycol monooleate is used as a surfactant, it becomes possible to completely dissolve a parahydroxybenzoate in an adhesive agent layer with high water content
Implementation Method 2
parahydroxybenzoate as an antiseptic at 0.01 to 1% by mass based on the total mass of the adhesive agent layer, and the growth of bacteria and mold in the adhesive agent layer is sufficiently prevented over a long period of time
Implementation Method 3
polyvinyl alcohol as a first water-soluble polymer at 3 to 10% by mass based on the total mass of the adhesive agent layer, polyacrylic acid as a second water-soluble polymer at 0.5 to 5% by mass based on the total mass of the adhesive agent layer, adhesion strength is sufficiently high, and the occurrence of liner displacement and seepage is sufficiently suppressed
Data Source
AI summary
A cooling sheet comprising: a backing layer; an adhesive agent layer; and a liner layer for protecting the adhesive agent layer, wherein the adhesive agent layer containswater at 65 to 85% by mass based on a total mass of the adhesive agent layer,polyalkylene glycol monooleate at 0.12 to 0.7% by mass based on the total mass of the adhesive agent layer,polyvinyl alcohol at 3 to 10% by mass based on the total mass of the adhesive agent layer,polyacrylic acid at 0.5 to 5% by mass based on the total mass of the adhesive agent layer, anda parahydroxybenzoate at 0.01 to 1% by mass based on the total mass of the adhesive agent layer, anda mass ratio of a content of the polyvinyl alcohol to a content of the polyacrylic acid is in a range of 1.2:1 to 5:1.