Self-Lubricating Cellulose Ether Binders for Ceramic Extrusion
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Solution Overview
Problem
Current ceramic extrusion processes face challenges in achieving homogeneous mixing of organic binders and lubricants, leading to inadequate lubrication and increased processing pressures, which can result in defects and reduced equipment life.
Innovation Solution
The use of self-lubricating organic binders, where a monocarboxylic acid lubricant is chemically grafted to a cellulose ether binder, enhancing homogenization and reducing the need for separate lubricant and binder components, thereby improving cohesion and lubricity within the ceramic precursor batch composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate organic binders and lubricants are used in ceramic extrusion, then good batch cohesion and lubrication are achieved, but homogeneous mixing of additives is difficult and processing pressures remain high
Solution Approach 1:
The patent combines separate binder and lubricant functions into a single self-lubricating binder molecule. The binder contains both adhesive functional groups (for cohesion) and lubricating alkyl chains (for lubrication), eliminating the need for separate additive components and achieving homogeneous mixing at the molecular level while maintaining both cohesion and lubrication properties
Solution Approach 2:
The self-lubricating binder performs multiple functions simultaneously: it provides batch cohesion through adhesive functional groups, lubrication through alkyl chains, and ensures homogeneous distribution. This multi-functional molecule replaces what previously required separate binder and lubricant components, simplifying the formulation while improving performance
2Shape
If high pressures are exerted on plasticized batch material and equipment during extrusion, then shaping is achieved, but equipment life is reduced and processing costs increase
Solution Approach 1:
The self-lubricating binder provides internal lubrication to the plasticized batch material during extrusion. The lubricating alkyl chains within the binder molecules reduce friction between particles and against the die wall, enabling the material to self-lubricate during processing. This reduces the need for high external pressures, decreasing equipment wear and extending equipment life
3Stress or pressure
If separate lubricants are used to reduce extrusion pressure, then lubrication is improved, but mixing homogeneity and batch cohesion are compromised
Solution Approach 1:
The invention merges lubrication and cohesion functions into a single molecular structure. The self-lubricating binder contains both lubricating alkyl chains and adhesive functional groups, ensuring that lubrication is provided without sacrificing batch cohesion. The homogeneous molecular distribution eliminates the separation issues that occur when separate lubricants are used
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
This approach reduces extrusion die pressures, mixing torque, and improves the homogeneity and cohesiveness of ceramic articles, leading to fewer defects and longer equipment life by providing improved lubrication and bonding properties.
Implementation Method 1
an organic binder system comprising at least one organic lubricant grafted to a cellulose ether binder
Implementation Method 2
self-lubricating organic binders... providing improved lubrication and bonding properties
Implementation Method 3
fired under conditions effective to convert the extruded green body via sintering or reaction-sintering into a unitary ceramic article
Data Source
AI summary
A method for producing a ceramic article comprising the steps of providing a plasticized ceramic precursor batch composition comprising an inorganic ceramic powder batch composition; a liquid vehicle; and an organic binder system comprising at least one organic lubricant grafted to a cellulose ether binder. An extruded green body can be formed from the plasticized ceramic precursor batch composition and subsequently fired under conditions effective to convert the extruded green body into a unitary ceramic article. Also provided are ceramic articles manufactured by the methods disclosed herein.