Urethane Resin Smectite Gas Barrier Composition
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Solution Overview
Problem
Existing resin compositions face challenges in achieving high gas barrier properties due to the bulkiness of sheet inorganic compounds and the limited compatibility with resins, as well as the rigidity and lack of flexibility in clay membranes, which restrict their use in various applications.
Innovation Solution
A resin composition combining a urethane resin with smectite that has partially immobilized lithium, which enhances dispersibility and gas barrier properties, including water vapor and oxygen barrier properties, by forming a crosslink structure with compounds containing epoxy groups.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sheet inorganic compounds are used to improve gas barrier properties, then oxygen and water vapor barrier properties are enhanced, but dispersibility in resin deteriorates due to bulkiness
Solution Approach 1:
The sheet inorganic compound is divided into fine particles through mechanical processing (sand blasting, jet milling, classification) to create particle sizes of 0.5-5 μm. This segmentation overcomes the bulkiness issue while maintaining the gas barrier properties, enabling good dispersibility in the resin matrix.
Solution Approach 2:
The particle size parameter of the sheet inorganic compound is changed from bulk dimensions to fine particles (0.5-5 μm). This parameter change resolves the contradiction by maintaining the barrier function while improving dispersibility and compatibility with the resin.
2Reliability
If clay membrane is made into self-supporting membrane to achieve high gas barrier properties, then oxygen and water vapor barrier properties are enhanced, but flexibility deteriorates due to high filler content
Solution Approach 1:
The sheet inorganic compound particles are locally distributed within the resin matrix rather than forming a continuous membrane structure. This local distribution provides gas barrier properties at the particle level while maintaining the overall flexibility and processability of the resin composition.
Solution Approach 2:
The invention creates a composite material where sheet inorganic compound particles are dispersed in a resin matrix. This composite structure combines the gas barrier properties of the inorganic compound with the flexibility and processability of the resin, avoiding the rigidity issue of self-supporting clay membranes.
3Reliability
If amount of filler is increased to achieve high gas barrier properties, then oxygen and water vapor barrier properties are enhanced, but compatibility with resin deteriorates
Solution Approach 1:
The sheet inorganic compound particles are pre-treated with surface modification (silane coupling agents, organic compounds) before being mixed with the resin. This preliminary surface treatment improves compatibility and dispersibility, allowing higher filler content to be incorporated without compromising resin compatibility.
Solution Approach 2:
Surface modification agents act as intermediaries between the sheet inorganic compound particles and the resin matrix. These intermediaries improve the interfacial adhesion and compatibility, enabling higher filler content while maintaining good dispersion and resin properties.
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 resin composition achieves superior gas barrier properties, flexibility, and adaptability across different filler content levels, making it suitable for diverse applications such as packaging, electronic materials, and coatings.
Implementation Method 1
forming a crosslink structure with compounds containing epoxy groups
Implementation Method 2
superior gas barrier properties, including water vapor and oxygen barrier properties
Data Source
AI summary
A resin composition is provided that contains a urethane resin and a smectite with partially immobilized lithium.