Nitrile Rubber Closed-Cell Foam Sealing Material
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Solution Overview
Problem
Existing waterproof sealing materials, such as rubber-based resin closed-cell foam sheets, face challenges with reduced sealing capability over time due to decreased repulsive force and poor adhesion properties, leading to inadequate waterproofing, especially when compression flexibility is low or when open-cell foams allow water passage.
Innovation Solution
A rubber-based resin closed-cell foam sheet with 30% or more acrylonitrile content, combined with a preferred acrylonitrile butadiene rubber and optional liquid acrylonitrile butadiene rubber, is used, featuring a high closed-cell ratio and optimized for compression flexibility and adhesion, with ionizing radiation cross-linking and specific additives to enhance durability and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If closed-cell foam is used to improve waterproofing capability, then water resistance is improved, but compression flexibility deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber-based resin by specifying acrylonitrile content of 30-50% by weight, which fundamentally alters the material's properties to simultaneously achieve both closed-cell structure benefits and improved compression flexibility
Solution Approach 2:
The patent uses composite material construction by combining rubber-based resin with specific additives (silica, alumina, calcium carbonate) and controlling the foam structure, creating a material that integrates the advantages of both closed-cell waterproofing and flexible compression recovery
2Ease of manufacture
If rubber-based resin with low acrylonitrile content is used, then processing ease is improved, but adhesion property and sealing capability deteriorate
Solution Approach 1:
The patent establishes specific parameter ranges for acrylonitrile content (30-50% by weight) that optimize the balance between processing characteristics and adhesion properties, ensuring both ease of manufacture and reliable sealing capability
3Ease of operation
If open-cell foam is used to improve compression flexibility, then compression flexibility is improved, but waterproofing capability deteriorates
Solution Approach 1:
The patent applies local quality by creating a closed-cell foam structure that provides waterproofing in the bulk material while maintaining localized flexibility through the rubber-based resin composition and controlled cell structure
Solution Approach 2:
The patent changes the fundamental structure parameter from open-cell to closed-cell foam while adjusting the rubber-based resin composition to maintain compression flexibility, thereby achieving both waterproofing and flexibility
4Reliability
If fixed-form sealing material with cell skin is used, then initial waterproofing is improved, but long-term sealing capability deteriorates
Solution Approach 1:
The patent ensures continuity of useful action by using a closed-cell foam structure that maintains its waterproofing capability over time without the degradation issues of fixed-form materials, allowing sustained sealing performance throughout the product lifecycle
Solution Approach 2:
The patent changes the material composition parameters by using rubber-based resin with 30-50% acrylonitrile content, which provides long-term stability and maintains sealing capability over extended periods without the degradation problems of alternative materials
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 resulting foam sheet maintains excellent sealing capability and compression flexibility, preventing deformation and water passage, ensuring high and sustained waterproofing performance even after prolonged use.
Implementation Method 1
A rubber-based resin is required to have not a liquid state but a rubber elasticity at 20° Celsius and one atmospheric pressure (1.01×10−1 MPa)
Implementation Method 2
the foam sheet includes a rubber-based resin containing 30% or more by weight of acrylonitrile ingredient... maintaining excellent sealing capability and compression flexibility, preventing deformation and water passage
Data Source
AI summary
The present invention provides a rubber-based resin closed-cell foam sheet with its sealing capability being unlikely to be lowered even for a prolonged period of use, and with its excellent waterproofing capability. The inventive rubber-based resin closed-cell foam sheet is characterized in that the foam sheet includes a rubber-based resin containing a nitrile group, and exhibits an excellent adhesion. When used as a waterproof sealing material, the foam sheet can adhere, in a tightly close contact, to the interface of a portion to be sealed. Therefore, the inventive rubber-based resin closed-cell foam sheet can be advantageously used as a waterproof sealing material having high sealing capability and excellent waterproofing capability.