Cellulose Ether and Microcrystalline Cellulose in Inorganic Binders
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Solution Overview
Problem
Water-based inorganic binder compositions, such as gypsum-based joint mortars and cement-based tile adhesives, face challenges in workability and final properties, particularly in reducing lump formation and improving freeze-thaw resistance, with existing solutions like methylhydroxypropyl cellulose being expensive and complex to synthesize.
Innovation Solution
Incorporating a combination of cellulose ether and microcrystalline cellulose at specific concentrations (10-30% by weight) into water-based inorganic binder compositions, eliminating the need for methylhydroxypropyl cellulose and agglomerated additive materials, enhances workability and performance across various systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If methylhydroxypropyl cellulose is used to improve workability and reduce lump formation, then workability improves, but manufacturing complexity and cost increase due to synthesis and mill drying requirements
Solution Approach 1:
The patent replaces expensive, complex-to-manufacture methylhydroxypropyl cellulose with a combination of cheaper, readily available cellulose ether and microcrystalline cellulose. This substitution eliminates the need for complex synthesis and mill drying processes while achieving comparable or superior workability and lump formation reduction in gypsum-based joint mortar compositions.
Solution Approach 2:
The patent employs a composite additive system combining cellulose ether and microcrystalline cellulose in specific proportions. This composite approach achieves the desired workability improvement and lump formation reduction that previously required the more complex methylhydroxypropyl cellulose, thereby simplifying manufacturing while maintaining performance.
2Ease of operation
If methylhydroxypropyl cellulose is used to improve workability, then leveling improves in gypsum spray plaster, but additive cost increases
Solution Approach 1:
The patent substitutes the expensive methylhydroxypropyl cellulose with a cost-effective combination of cellulose ether and microcrystalline cellulose. This replacement maintains the leveling performance in gypsum spray plaster while significantly reducing additive costs by eliminating the need for complex synthesis processes.
3Reliability
If conventional additives are used in cement-based tile adhesive, then basic performance is maintained, but freeze-thaw resistance is insufficient
Solution Approach 1:
The patent introduces a composite additive system of cellulose ether and microcrystalline cellulose specifically for cement-based tile adhesives. This combination provides enhanced freeze-thaw resistance compared to conventional single additives, while maintaining ease of manufacture through the use of readily available cellulose materials that do not require complex synthesis.
Data Source
AI summary
A new water-based inorganic binder composition includes inorganic binder, cellulose ether and microcrystalline cellulose. A new additive for water-based inorganic binder compositions includes cellulose ether and microcrystalline cellulose. A method for improving the properties of water-based inorganic binder compositions includes blending a combination of cellulose ether and microcrystalline cellulose in the water-based binder composition.