Addition-Curable Silicone Rubber Flame Retardancy
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Solution Overview
Problem
Conventional flame retardants added to silicone rubber compositions compromise the mechanical and rubber properties of the cured product, while existing silicone rubber compositions lack effective flame retardancy without these additives.
Innovation Solution
An addition-curable silicone rubber composition combining an alkenyl-containing organopolysiloxane, organohydrogenpolysiloxane, reinforcing silica, a platinum catalyst, a triazole compound, and an isocyanate compound, which enhances flame retardancy without detracting from physical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional flame retardants (aluminum hydroxide, carbon black, zinc carbonate powder) are added to silicone rubber compositions, then flame retardancy is improved, but appearance changes and viscosity buildup occur, and physical properties (mechanical strength and elongation) are altered
Solution Approach 1:
The patent changes the chemical composition parameters by using specific ratios of vinyl-containing organopolysiloxane (100 parts), organohydrogenpolysiloxane (0.2-20 parts), triazole compound (0.01-5 parts), and isocyanate compound (0.01-5 parts). This parameter optimization enables flame retardancy without the need for conventional flame retardant additives that would compromise mechanical properties.
Solution Approach 2:
The patent creates a composite silicone rubber system by combining multiple components with specific functions: vinyl-containing organopolysiloxane as base polymer, organohydrogenpolysiloxane for crosslinking, triazole compound for flame retardancy, and isocyanate compound for enhanced performance. This composite approach achieves flame retardancy while preserving mechanical properties through synergistic interactions rather than simple additive mixing.
2Object-affected harmful factors
If conventional flame retardants are added to silicone rubber compositions, then flame retardancy is improved, but appearance changes and viscosity buildup occur
Solution Approach 1:
The patent optimizes concentration parameters of flame retardant components (triazole compound at 0.01-5 parts and isocyanate compound at 0.01-5 parts per 100 parts of vinyl-containing organopolysiloxane) to achieve effective flame retardancy while minimizing viscosity buildup and appearance changes. This precise parameter control avoids the drawbacks of conventional flame retardant addition.
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 achieves excellent flame retardancy rated as V-2 or better according to the UL94 standard without compromising the mechanical or rubber properties of the silicone rubber.
Implementation Method 1
a platinum catalyst
Implementation Method 2
addition-curable silicone rubber composition
Implementation Method 3
the benzotriazole compound and the fatty acid compound work synergistically to provide flame retardancy properties
Data Source
AI summary
To an addition-curable silicone rubber composition comprising (A) an organopolysiloxane having at least two alkenyl groups, (B) an organohydrogenpolysiloxane having at least two SiH groups, (C) reinforcing silica, and (D) a platinum catalyst, a flame retardant combination of (E) a triazole compound and (F) an isocyanate compound is added. The composition cures into a silicone rubber which exerts excellent flame retardancy without compromising physical properties of the silicone rubber base.