Silicone Rubber Fabric Coating for Durable Pressure Barriers
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Solution Overview
Problem
Conventional silicone-rubber-coated textile fabrics fail to maintain a pressure barrier effectively between two areas with a pressure differential for a long time, often due to insufficient elongation and increased weight or complexity in manufacturing processes.
Innovation Solution
A silicone-rubber composition comprising alkenyl group-containing organopolysiloxanes, organohydrogenpolysiloxanes, a platinum-system hydrosilylation catalyst, and reinforcement fine silica powder, which forms a cured product with elongation greater than 800% and maintains a pressure barrier without the need for solvents, simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional silicone-rubber coating compositions are used, then the manufacturing process is simpler, but the elongation is insufficient (less than 800%) and the pressure barrier performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone-rubber coating by specifying precise ratios of alkenyl-containing organopolysiloxane (A) to organohydrogenpolysiloxane (B) and controlling the alkenyl group content (0.5-2.0 mass%), which enables the cured product to achieve elongation of 800% or more while maintaining pressure barrier performance without complicating the manufacturing process
Solution Approach 2:
The patent creates a composite silicone-rubber coating system by combining specific types of organopolysiloxane (A) with organohydrogenpolysiloxane (B) in controlled ratios, along with catalyst (C) and fine silica powder (D), forming a composite material that achieves both high elongation (≥800%) and effective pressure barrier properties
2Reliability
If two-layer coating structure is used, then the pressure barrier performance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the functions of multiple coating layers into a single-layer coating by incorporating multiple functional components (organopolysiloxane A with specific alkenyl content, organohydrogenpolysiloxane B, catalyst C, and fine silica powder D) in precise ratios within one coating composition, achieving both high elongation (≥800%) and effective pressure barrier performance without requiring complex multi-layer structures
3Reliability
If two-layer coating structure is used, then the pressure barrier performance is improved, but the weight of the coated fabric increases
Solution Approach 1:
The patent optimizes the weight of the coated fabric by precisely controlling the composition parameters of the single-layer coating, specifically the ratio of organopolysiloxane (A) to organohydrogenpolysiloxane (B) and the alkenyl group content (0.5-2.0 mass%), which enables achieving high elongation (≥800%) and effective pressure barrier performance with minimal coating material, thus reducing the overall weight compared to multi-layer coatings
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 composition effectively maintains a pressure barrier between two areas with a pressure differential for a long time, improving mechanical properties and reducing manufacturing complexity and weight, while maintaining excellent adhesion and durability.
Implementation Method 1
an organohydrogenpolysiloxane (B) that comprises a mixture of an organohydrogenpolysiloxane (B-1) that has on average three silicon-bonded hydrogen atoms in one molecule and an organohydrogenpolysiloxane (B-2) that has on average two silicon-bonded hydrogen atoms in one molecule... a platinum-system hydrosilylation catalyst (c)
Data Source
AI summary
A silicone-rubber composition for coating textile fabrics characterized in that the silicone-rubber composition comprises the following components: an alkenyl group-containing organopolysiloxane (A) that comprises a mixture of an organopolysiloxane (A-1) that contains in one molecule at least two alkenyl groups in the amount not exceeding 2 mass % and an organopolysiloxane (A-2) that contains in one molecule at least two alkenyl groups in amount of 5 mass % or more; an organohydrogenpolysiloxane (B) that comprises a mixture of an organohydrogenpolysiloxane (B-1) that has in one molecule on average three silicon-bonded hydrogen atoms and an organohydrogenpolysiloxane (B-2) that has in one molecule on average two silicon-bonded hydrogen atoms; a hydrosilylation catalyst (C); and a reinforcement fine silica powder (D); and elongation according to JIS K6251 of the cured product of the composition is equal to or greater than 800 %.