Ultrafine Cellulose Sheet With Cationic Resin For Transparency And Water Resistance
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Solution Overview
Problem
Sheets containing ultrafine cellulose fibers lack both sufficient water resistance and transparency, as existing solutions fail to achieve these properties simultaneously.
Innovation Solution
A sheet comprising cellulose fibers with a fiber width of 1000 nm or less and a cationic resin, specifically polyamine polyamide epihalohydrin, is developed, with controlled haze and water absorption rates to enhance both water resistance and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cationic aqueous resin is added to enhance water resistance, then water resistance is improved, but transparency deteriorates
Solution Approach 1:
The patent applies parameter changes by carefully controlling the haze value (a transparency parameter) to 8% or less while selecting specific cationic resins with appropriate molecular weights and charge densities. This allows achieving water resistance through resin addition while maintaining transparency by optimizing the physical and chemical parameters of the resin and processing conditions
Solution Approach 2:
The patent uses composite materials by combining ultrafine cellulose fibers with specifically selected cationic resins (such as polyamine polyamide epihalohydrin resin) in controlled proportions. This composite approach enables simultaneous achievement of water resistance from the resin and transparency from the ultrafine fiber structure with controlled haze
2Strength
If resin is added to enhance mechanical strength, then tensile strength is improved, but transparency deteriorates
Solution Approach 1:
The patent controls the haze parameter to 8% or less while adding resin to enhance tensile strength. By optimizing the resin type, concentration, and distribution, the patent achieves mechanical reinforcement without significant transparency loss
Solution Approach 2:
The patent creates a composite structure where ultrafine cellulose fibers provide the base matrix and resin provides reinforcement. The composite design ensures that resin addition improves tensile strength while the ultrafine fiber structure and controlled haze maintain transparency
3Reliability
If haze is increased to improve water resistance, then water resistance is improved, but transparency deteriorates
Solution Approach 1:
The patent optimizes the haze parameter to be 8% or less, finding the optimal balance point where sufficient water resistance is achieved through resin addition while transparency is maintained. This involves controlling processing parameters such as resin concentration, drying conditions, and fiber orientation to minimize haze while achieving water resistance
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 resulting sheet exhibits excellent transparency and water resistance, with improved tensile strength and light transmittance, making it suitable for various applications.
Implementation Method 1
a sheet including ultrafine cellulose fibers and a cationic resin
Data Source
AI summary
It is an object of the present invention is to provide a sheet containing ultrafine cellulose fibers, which is excellent in transparency and water resistance. The present invention relates to a sheet including cellulose fibers having a fiber width of 1000 nm or less, and polyamine polyamide epihalohydrin, wherein the haze of the sheet is 6% or less.