Polysiloxane Flame-Resistant Binder for High-Temperature Composites
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Solution Overview
Problem
Current chemical compositions, such as polysilazanes, face limitations in commercial availability and cost, restricting their applications due to requirements for catalysts or enhancers for curing, and lack of desirable properties like flame resistance, durability, and customization options.
Innovation Solution
A composition comprising polysiloxane, polysilazane, and polysilane, curable at ambient temperatures, forming a flame-resistant binder for fiber composites that withstands high temperatures, with customizable properties like color, appearance, and UV resistance, using a mixture of polyphenylmethylsiloxane, α,ω-methoxy-terminated polydimethylsiloxane, and polysilane, along with optional enhancers like butyltitanate and aminoethylaminopropyltrimethoxysilane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polysilazanes are used as the composition, then flame resistance and high temperature stability are improved, but the need for catalysts or enhancers increases complexity and cost
Solution Approach 1:
The patent extracts and eliminates the requirement for external catalysts or enhancers by incorporating self-curing polysiloxane chemistry directly into the composition. The composition cures through ambient moisture reaction without needing separate curing agents, thereby simplifying the system while maintaining flame resistance and high-temperature stability.
Solution Approach 2:
The composition is designed to be self-curing through reaction with ambient moisture, eliminating the need for external catalysts or enhancers. The polysiloxane chemistry inherently provides the curing mechanism, making the system self-sufficient and reducing complexity.
2Temperature
If polysilazanes are used, then high temperature stability is improved, but commercial availability and cost are worsened
Solution Approach 1:
The patent replaces expensive, commercially limited polysilazanes with a more affordable polysiloxane-based composition that achieves comparable performance. The self-curing mechanism and ambient temperature processing further reduce manufacturing costs and improve commercial viability.
Solution Approach 2:
The patent changes the chemical composition parameters from polysilazane-based to polysiloxane-based systems, fundamentally altering the material chemistry to achieve better commercial availability while maintaining heat stability through the inherent properties of the polysiloxane structure.
3Ease of operation
If traditional compositions are used, then curing is achieved, but customization in terms of color, appearance, and UV resistance is limited
Solution Approach 1:
The polysiloxane composition serves multiple functions simultaneously: it provides structural binding, flame resistance, heat stability, and a platform for customization through pigment and additive incorporation. The base chemistry supports various color options, gloss levels, and UV-resistant formulations without compromising curing performance.
Solution Approach 2:
The composition allows for localized property optimization by incorporating specific pigments, UV stabilizers, and functional additives at controlled concentrations. This enables customization of color, appearance, and UV resistance while maintaining the core curing and protective functions.
4Area of stationary object
If thick coatings are applied, then coverage is improved, but durability and heat stability are reduced
Solution Approach 1:
The composition utilizes controlled phase transitions during curing, forming a dense, crosslinked network structure that provides excellent durability and heat stability even at thin film thicknesses. The ambient temperature curing process ensures uniform penetration and bonding throughout the coating layer.
Solution Approach 2:
The patent creates a composite structure through the polysiloxane network formation, combining organic and inorganic elements to achieve a coating that is both durable and heat-stable. This composite chemistry allows for superior performance at reduced thickness compared to traditional organic 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 enables the creation of durable, heat-stable, and customizable coatings and composites that can withstand temperatures over 1800°F, suitable for various applications including cookware and high-temperature environments without the need for additional curing agents, while being cost-effective and environmentally friendly.
Implementation Method 1
The gel structure is formed by a condensation reaction between water vapor and the silane-modified polysiloxane.
Implementation Method 2
The gel structure may be pyrolyzed to form a ceramic material.
Data Source
AI summary
Provided herein is a composition comprising from 50% to 60% polysiloxane consisting essentially of polyphenylmethylsiloxane and α,ω-methoxy-terminated polydimethylsiloxane, from 40% to 50% organic solvent, from 2% to 4% polysilazane, and polysilane of a formula (R1R2Si)n, wherein n is greater than 1, and wherein R1 and R2 are the same or different and are alkyl, alkenyl, cycloalkyl, alkylamino, aryl, aralkyl, or alkylsilyl. The composition, after curing, is a flame resistant binder for forming a composition-fiber composite that withstands repeated temperatures over 1800° F. The composition may further comprise from 0.1% to 2% of an enhancer selected from butyltitanate and aminoethylaminopropyltrimethoxysilane (H2NC2H4NHC3H6—Si(OCH3)3). The composition may be mixed with fibers in a ratio of 35:65 to 45:55 (w/w), and the composition-fiber mixture may be cured under vacuum at a temperature of 200° F. to 450° F. for 30 minutes to 180 minutes to form a composite.