Foamed Body Surface Charge and Surfactant Foaming
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Solution Overview
Problem
Inorganic fibers other than asbestos, used to produce foamed bodies, exhibit poor dispersibility and entanglement properties, resulting in hard and low-resilience foamed bodies with poor workability and deformation characteristics.
Innovation Solution
A method involving charging the surface of inorganic fibers, stirring a dispersion with a surfactant to foam, drying, and imparting a coupling agent, while controlling zeta potential and using bio-soluble fibers like glass or ceramic fibers, to create a foamed body with improved compressive stress, recovery ratio, and Young's modulus, enhancing flexibility and sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If inorganic fibers other than asbestos are used to produce foamed bodies, then environmental hygiene requirements are met, but dispersibility and entanglement properties deteriorate, resulting in hard foamed bodies with low resilience
Solution Approach 1:
The invention changes the surface charge parameter of inorganic fibers from neutral to negatively charged by treating with alkaline solutions. This parameter change improves dispersibility and entanglement properties, allowing non-asbestos fibers to form soft, resilient foamed bodies with good workability while meeting environmental requirements
Solution Approach 2:
The invention introduces an intermediary substance (surfactant) that mediates between the charged inorganic fibers and the foaming process. The surfactant enhances bubble formation and stabilizes the foam structure, enabling proper foamed body production from non-asbestos fibers with improved mechanical properties
2Object-affected harmful factors
If inorganic fibers other than asbestos are used, then health safety is improved, but deformation characteristics such as flexibility and resiliency deteriorate
Solution Approach 1:
By changing the surface charge parameter through alkaline treatment and controlling zeta potential, the invention enables non-asbestos fibers to achieve appropriate flexibility and resiliency. The charged fibers interact properly with surfactants to form foam structures that deform and recover effectively, meeting health safety requirements while maintaining good deformation characteristics
Solution Approach 2:
The invention creates a composite structure combining charged inorganic fibers with surfactants and foam bubbles. This composite approach allows non-asbestos fibers to achieve the desired mechanical properties and deformation characteristics that were previously only attainable with asbestos fibers
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 foamed body with compressive stresses of 1 MPa or less, high recovery ratios, and low apparent Young's modulus, ensuring high flexibility and improved deformation characteristics from normal to high temperatures, enhancing sealing properties and thermal insulation.
Implementation Method 1
stirring a dispersion containing the charged inorganic fiber and a surfactant to allow it to foam
Implementation Method 2
charging the surface of inorganic fiber negatively or positively; stirring a dispersion containing the charged inorganic fiber and a surfactant
Data Source
AI summary
A foamed body that is a porous foamed body including inorganic fibers other than asbestos, and having a compressive stress when compressed at normal temperature at a compression ratio of 80% of 0.1 MPa or less and a recovery ratio when compressed at normal temperature at a compression ratio of 80% of 50% or more.