Inverse Emulsion Lubrication for Green Ceramic Extrusion
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Solution Overview
Problem
Conventional green ceramic batch mixtures face challenges in achieving effective lubrication during extrusion, as existing theories on lubrication mechanisms are incorrect, leading to inefficiencies in the process.
Innovation Solution
Incorporating a water-in-oil inverse emulsion in the green ceramic batch mixture, where the oil serves as the continuous phase and water as the dispersed phase, with a functionalized silicone compound as the emulsifier, to enhance lubrication by stabilizing the aqueous dispersed phase and increasing the viscosity of the continuous phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional green ceramic batch mixtures are used, then the extrusion process can proceed, but effective lubrication is not achieved leading to process inefficiencies
Solution Approach 1:
The patent changes the physical and chemical parameters of the batch mixture by incorporating an inverse emulsion system with specific oil-to-water ratio, emulsifier concentration, and viscosity modifiers. This transforms the lubrication mechanism from ineffective conventional approaches to a controlled emulsion-based system that provides optimal lubrication during extrusion, resolving the contradiction between ease of operation and productivity
Solution Approach 2:
The invention creates a composite batch mixture system combining ceramic powders, binders, and an inverse emulsion comprising oil continuous phase, water dispersed phase, and emulsifier. This composite structure provides synergistic effects where the emulsion droplets act as lubricant carriers, improving both the lubrication effectiveness and extrusion efficiency simultaneously
2Ease of operation
If an inverse emulsion is incorporated to enhance lubrication, then lubrication dynamics improve and micro-droplet size is maintained below 10 μm, but the batch mixture formulation becomes more complex
Solution Approach 1:
The emulsifier acts as an intermediary substance that stabilizes the inverse emulsion system, preventing droplet coalescence and maintaining the complex formulation in a controllable state. This intermediary component enables the system to achieve improved lubrication dynamics while keeping the formulation complexity manageable through chemical stabilization
Solution Approach 2:
By carefully controlling parameters such as emulsifier concentration, oil-to-water ratio, and mixing conditions, the patent transforms a potentially complex formulation into a controlled system where the inverse emulsion maintains stable micro-droplet sizes below 10 μm, achieving improved lubrication while managing formulation complexity through parameter optimization
Data Source
AI summary
Green ceramic batch mixtures include: at least one inorganic batch component, preferably cordierite; at least one binder, preferably polyisoprene, poly(vinyl formal), poly(vinyl methyl ether), polybutadiene carboxy terminated; and an inverse emulsion having a continuous phase, an aqueous dispersed phase, and at least one emulsifier, preferably at least one functionalized silicone compound having at least one functional group chosen from a hydroxyl group, a carboxyl group, hydroxyl-terminated ethylene oxide groups.