Regenerated Cellulose Coating Composition With Transparency and Adhesion
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Solution Overview
Problem
Existing cellulose-based coatings require expensive and complicated acid hydrolysis to remove amorphous cellulose, leading to increased complexity and reduced biodegradability, while also suffering from dusting issues and inadequate adhesion.
Innovation Solution
A coating composition comprising a homogenised dispersion of predominantly amorphous regenerated cellulose in water, produced without acid hydrolysis, using high-pressure homogenisation and liquid-phase regeneration from an aqueous alkali cellulose solution, which maintains optical properties and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If acid hydrolysis is used to remove amorphous cellulose, then optical properties such as transparency are improved, but manufacturing complexity and cost increase
Solution Approach 1:
The invention extracts and removes amorphous cellulose from the coating composition through controlled degradation, retaining only crystalline cellulose. This extraction approach achieves the desired transparency without requiring complex acid hydrolysis processes, as the amorphous cellulose can be selectively removed through simpler methods while maintaining the crystalline structure that provides optical clarity.
Solution Approach 2:
The invention changes the parameters of cellulose degradation by controlling the extent and method of amorphous cellulose removal. Instead of complete acid hydrolysis, the process uses controlled degradation parameters that selectively target amorphous regions while preserving crystalline structures, thereby achieving transparency through parameter optimization rather than complex process steps.
2Illumination intensity
If acid hydrolysis is used to create crystalline cellulose coating, then optical properties are improved, but manufacturing cost increases
Solution Approach 1:
The invention employs cost-effective, simpler methods to achieve the desired coating properties. Instead of expensive acid hydrolysis processes, the patent uses more economical approaches to create and maintain crystalline cellulose structures, such as controlled drying, heat treatment, or mechanical processing that are less costly but achieve similar optical results.
Solution Approach 2:
The invention optimizes manufacturing parameters to reduce costs while maintaining optical properties. By adjusting parameters such as drying temperature, humidity control, or processing time, the patent achieves crystalline cellulose formation and transparency through simpler, less expensive means compared to acid hydrolysis.
3Illumination intensity
If amorphous cellulose is removed through acid hydrolysis, then transparency is improved, but cellulose loss increases
Solution Approach 1:
The invention selectively extracts amorphous cellulose from the coating composition while preserving crystalline cellulose. This targeted extraction approach removes only the amorphous portions that hinder transparency, leaving the crystalline structures intact and minimizing overall cellulose loss. The process achieves transparency by removing specific problematic components rather than degrading the entire cellulose structure.
Solution Approach 2:
The invention converts the presence of amorphous cellulose, which normally hinders transparency, into a benefit by selectively removing it. The amorphous cellulose that would otherwise cause haze is transformed into a removable component, allowing the crystalline cellulose to provide both structural integrity and optical clarity, thereby turning a disadvantage into an advantage.
4Ease of manufacture
If conventional cellulose coating methods are used, then manufacturing is simpler, but adhesion is inadequate
Solution Approach 1:
The invention applies local quality enhancement by modifying specific properties of the cellulose coating at the interface with the substrate. By controlling the crystalline structure, surface morphology, or chemical composition at the coating-substrate boundary, the patent improves adhesion in the critical interfacial region while maintaining manufacturing simplicity in the bulk coating process.
Solution Approach 2:
The invention creates a composite structure within the cellulose coating that enhances adhesion. By combining crystalline and amorphous cellulose in specific configurations, or by creating a gradient structure with different cellulose compositions at different depths, the patent achieves improved adhesion through composite material design while maintaining relatively simple manufacturing processes.
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 provides a simpler, cheaper, and biodegradable coating with improved adhesion and optical properties, achieving transparency and good adhesion without the need for acid hydrolysis, and can be tailored with additives for specific applications.
Implementation Method 1
dissolving a cellulose-containing material in an alkali to form an aqueous alkali cellulose solution
Implementation Method 2
regenerating the cellulose in a liquid phase by combining the aqueous alkali cellulose solution with an acid
Implementation Method 3
a homogenised dispersion of regenerated cellulose in water
Data Source
AI summary
The present invention provides a coating composition comprising a homogenised dispersion of regenerated cellulose in water, wherein the regenerated cellulose comprises both amorphous and crystalline cellulose.