Sepiolite Ceramic Material Low-Temperature Geopolymerization
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Solution Overview
Problem
Existing moisture-regulating ceramic materials face challenges in maintaining antibacterial and microbial properties while controlling ambient humidity and strength, as they can harbor microorganisms due to their capillary structure, and high-temperature heat treatment increases energy requirements and generates industrial wastes.
Innovation Solution
A method involving the mixing of sepiolite with reactive alumina sulfate and boron-containing materials, followed by geopolymerization at low temperatures (25-250°C) with specific weight ratios and relative humidity, to create a ceramic material with antimicrobial properties without compromising moisture regulation and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If heat treatment is applied at temperatures above 600°C to provide strength to sepiolite-based moisture control material, then the material strength is improved, but energy consumption increases and industrial wastes such as fly ashes are formed
Solution Approach 1:
The invention changes the temperature parameter from high-temperature sintering (>600°C) to low-temperature geopolymerization (25-250°C). This parameter change allows achieving sufficient material strength through chemical bonding in the geopolymerization process rather than thermal sintering, thereby significantly reducing energy consumption while eliminating fly ash formation
Solution Approach 2:
The invention replaces the thermal field (heat treatment) with a chemical field (geopolymerization reaction). Instead of using thermal energy to bind particles, the process uses chemical reactions between alkaline activators and alumina sulfate to form geopolymer bonds, achieving strength through chemical bonding rather than thermal sintering
2Adaptability or versatility
If the capillary pore structure is used for moisture regulation in ceramic materials, then humidity control capability is improved, but microorganisms can adhere and reproduce in the material, posing hygiene threats
Solution Approach 1:
The invention introduces boron-containing substances (boric acid, borax) as intermediary agents that modify the capillary pore structure. These substances act as mediators between the pore structure and microorganisms, creating an environment that is hostile to microbial growth while preserving the moisture regulation function. The boron compounds may form borate crystals or modify pore surface chemistry to prevent microbial adhesion
3Adaptability or versatility
If sepiolite raw material is used individually for moisture control, then humidity regulation property is improved, but the material lacks sufficient strength for wall/ceiling tile applications
Solution Approach 1:
The invention creates a composite material system combining sepiolite (for moisture control) with alumina sulfate (for strength) and boron-containing substances (for antimicrobial properties). This composite approach allows each component to contribute its unique properties: sepiolite provides capillary pores for humidity regulation, alumina sulfate provides structural strength through geopolymerization, and boron compounds provide antimicrobial protection
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 method produces a ceramic material with effective antibacterial and microbial properties, maintaining desired strength and humidity control, while reducing energy consumption and waste generation, as demonstrated by disc diffusion tests and geopolymerization processes.
Implementation Method 1
geopolymerizing a structure obtained by pressing the granules at a temperature of 25-250° C., in an environment of at least 50 % relative humidity, for a period of 2-24 hours
Implementation Method 2
Moisture regulation in ceramic materials is to condense moisture into capillary pores on the material surface when the humidity in the air is high and is to release the condensed moisture into the air when the humidity in the air is low
Implementation Method 3
Moisture regulation in ceramic materials is to condense moisture into capillary pores on the material surface when the humidity in the air is high
Implementation Method 4
adding 3-10 % boron-containing material by weight to the starting powder or alkali solution by dissolving it in alkali solution and geopolymerizing a structure obtained by pressing the granules
Data Source
AI summary
Disclosed is a moisture regulating ceramic material production method which includes the following process steps: mixing starting powders containing sepiolite and reactive alumina sulfate; grinding the starting powders; obtaining granules by dry granulation using alkaline solution with the starting powders; carrying out a pressing process of the granules; and obtaining the materials.