pH-Controlled Biosoluble Sealing Material for Honeycomb Structures
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Solution Overview
Problem
The existing sealing materials for honeycomb structures used in filters and catalyst carriers tend to aggregate or gelate due to pH imbalances, leading to reduced flowability and increased viscosity over time, making it difficult to apply them effectively to ceramic blocks.
Innovation Solution
A sealing material comprising inorganic fibers, oxide sol, and inorganic particles with a pH range of 4 to 6, specifically using alkali metal, alkaline earth metal, or boron compounds, which are biosoluble, is developed to maintain stability and prevent aggregation or gelation, ensuring superior coating properties and adhesive strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional sealing materials are used, then initial coating ability is achieved, but flowability deteriorates and viscosity increases over time due to aggregation and gelation
Solution Approach 1:
The patent adjusts the pH of the sealing material to a specific range (pH 4-6) to prevent aggregation and gelation of inorganic fibers. This parameter change maintains the flowability and coating properties of the sealing material over time, resolving the contradiction between stability and ease of operation.
Solution Approach 2:
The patent introduces a pH buffer system as an intermediary component to maintain the pH level within the optimal range. This buffer acts as a mediator that prevents pH fluctuations which would otherwise cause aggregation and gelation, thereby maintaining both stability and flowability.
2Strength
If inorganic fibers are used in sealing material, then adhesive strength is improved, but human body safety deteriorates due to harmful effects of inorganic fiber retention
Solution Approach 1:
The patent changes the chemical composition parameters of the inorganic fibers, specifically selecting biosoluble compounds (alkali metal, alkaline earth metal, or boron compounds) that dissolve in physiological saline. This parameter change maintains adhesive strength while eliminating the harmful effects of permanent inorganic fiber retention in the human body.
Solution Approach 2:
The patent employs biosoluble inorganic fibers that temporarily perform their adhesive function and then dissolve harmlessly in the human body through physiological processes. These fibers serve as temporary structural elements that are subsequently eliminated, replacing permanent harmful inorganic fibers with temporary benign ones.
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 sealing material maintains flowability and adhesive strength over time, ensuring effective application and safety for human exposure, with improved operational efficiency in forming peripheral sealing material layers and adhesive layers between honeycomb fired bodies.
Implementation Method 1
The sealing material contains, as an inorganic binder, oxide sol
Implementation Method 2
The sealing material has a pH of at least about 4 and at most about 6
Implementation Method 3
The biosoluble fibers are soluble in physiological saline solution. Therefore, even when taken into the human body, the biosoluble fibers are dissolved and discharged out of the body
Data Source
AI summary
A sealing material for a honeycomb structure includes inorganic fibers, oxide sol, and inorganic particles. The inorganic fibers include at least one of an alkali metal compound, an alkaline earth metal compound and a boron compound. The sealing material has a pH of at least about 4 and at most about 6.