Layered Cellulose Particle Coating for Heat-Stable Water Repellency
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Solution Overview
Problem
Existing cellulose particles lack sufficient water repellency and moist feeling when exposed to high temperature water for extended periods, leading to coating layer peeling and loss of functionality.
Innovation Solution
A cellulose particle configuration with a first coating layer containing a basic polysaccharide or its salt, followed by a second coating layer of a hydrophobic compound like calcium stearate, enhances water repellency and moist feeling by strong intermolecular bonding and hydrophobic interaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single coating layer is applied to the cellulose particle surface, then the manufacturing process is simple, but the water repellency and heat stability are insufficient
Solution Approach 1:
The coating layer is divided into two distinct functional layers: a first coating layer containing basic polysaccharide or its salt that provides adhesion and moisture retention, and a second coating layer containing hydrophobic compound that provides water repellency. This segmentation allows each layer to perform its specific function optimally, resolving the contradiction between simple manufacturing and stable water repellency.
Solution Approach 2:
The patent applies composite material structure by combining basic polysaccharide (or salt) with hydrophobic compound in a layered coating system. This composite structure integrates the advantages of both materials: the polysaccharide provides biocompatibility and adhesion, while the hydrophobic compound provides water repellency, achieving both ease of manufacture and reliable water repellency stability.
2Stability of the object's composition
If the coating layer is exposed to high temperature water for a long period, then the cellulose particle maintains structural integrity, but the coating layer peels off and loses functionality
Solution Approach 1:
The coating system is segmented into two layers with distinct thermal and functional properties. The first layer (basic polysaccharide/salt) provides thermal stability and adhesion to the cellulose particle, while the second layer (hydrophobic compound) maintains water repellency. This segmentation prevents coating peeling under high temperature conditions while preserving functionality.
Solution Approach 2:
The basic polysaccharide or its salt in the first coating layer acts as an intermediary between the cellulose particle and the hydrophobic compound in the second layer. This intermediary layer enhances intermolecular bonding and prevents direct thermal stress from causing coating peeling, thereby maintaining coating functionality during prolonged high temperature water exposure.
3Strength
If a polysaccharide with primary amine or secondary amine is used on the mother particle surface, then the coating adhesion is improved, but the water repellency and moist feeling are reduced
Solution Approach 1:
The patent segments the coating function into two separate layers: the first layer uses basic polysaccharide or salt (without primary/secondary amines) to provide adhesion through carboxyl group interactions, while the second layer uses hydrophobic compound to provide water repellency. This segmentation resolves the contradiction by preventing amine-containing polysaccharides from compromising water repellency while maintaining adequate adhesion.
Solution Approach 2:
Different regions of the coating system have different chemical properties optimized for specific functions. The first coating layer uses basic polysaccharide/salt with carboxyl groups for adhesion, while the second coating layer uses hydrophobic compound for water repellency. This local quality differentiation allows each region to perform its function optimally without compromise.
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
Maintains high water repellency and moist feeling even after prolonged exposure to high temperature water, preventing coating layer peeling and enhancing flexibility and biodegradability.
Implementation Method 1
a first coating layer that contains a cellulose particle having a single coating layer on the surface of the mother particle or contains a polysaccharide having no primary amine or secondary amine on the surface of the mother particle
Implementation Method 2
a second coating layer containing calcium stearate... enhances water repellency and moist feeling by strong intermolecular bonding and hydrophobic interaction
Implementation Method 3
enhances water repellency and moist feeling by strong intermolecular bonding
Data Source
AI summary
A cellulose particle includes a mother particle containing cellulose as a main component, a first coating layer containing at least one polysaccharide selected from the group consisting of a basic polysaccharide and a salt of the basic polysaccharide, the first coating layer being provided on a surface of the mother particle, and a second coating layer containing at least one hydrophobic compound selected from a fatty acid, a fatty acid metal salt, an acylated amino acid, or an acylated amino acid salt, the second coating layer being provided on the first coating layer.