Fluorine-Silicon Polyphosphate Ester Flame Retardant
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Solution Overview
Problem
Current flame retardants for polymer materials face challenges such as poor compatibility with matrix resins and limited functionality, which restricts their application and effectiveness in improving flame retardancy.
Innovation Solution
A fluorine-silicon-containing polyphosphate ester is synthesized through a method involving the reaction of silicon-containing compounds, triethylamine, and 2-chloro-1,3,2-dioxaphospholane-2-oxide, followed by the introduction of fluorine-containing compounds, to produce a macromolecular flame retardant that enhances the phosphorus and silicon content, forming protective carbon and silica layers, thereby improving thermal stability and flame retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flame retardants are used to improve flame retardancy of polymer materials, then flame retardant property is improved, but compatibility with matrix resin deteriorates
Solution Approach 1:
The patent employs a composite flame retardant system containing phosphorus, silicon, and fluorine elements in specific combinations. The phosphorus-silicon-fluorine composite structure enables synergistic effects where phosphorus provides flame retardancy, silicon enhances compatibility and thermal stability, and fluorine improves hydrophobicity. This composite approach resolves the contradiction by integrating multiple elements that collectively improve both flame retardant property and compatibility with the epoxy resin matrix.
Solution Approach 2:
The patent systematically varies the compositional parameters of the flame retardant, specifically adjusting the ratios of phosphorus, silicon, and fluorine content to optimize performance. By changing these chemical composition parameters, the invention achieves both improved flame retardancy and enhanced compatibility with the matrix resin, resolving the technical contradiction through parameter optimization.
2Reliability
If conventional flame retardants are used to improve flame retardancy of polymer materials, then flame retardant property is improved, but functionality is limited
Solution Approach 1:
The phosphorus-silicon-fluorine composite flame retardant performs multiple functions simultaneously: (1) flame retardancy through phosphorus-based char formation, (2) enhanced thermal stability and compatibility through silicon, (3) hydrophobicity and surface property modification through fluorine, and (4) improved mechanical property retention. This multi-functional design resolves the contradiction by making the flame retardant versatile rather than single-purpose.
3Reliability
If phosphorus-silicon-fluorine-containing copolyester is used to improve flame retardancy, then VTM-0 grade is achieved, but poor compatibility with matrix resin persists
Solution Approach 1:
The patent moves away from copolyester structures to a novel phosphorus-silicon-fluorine composite system with specifically controlled elemental ratios. By changing the chemical structure parameters from copolymer to composite additive form and optimizing the P-Si-F ratio, the invention achieves both VTM-0 flame retardant grade and improved compatibility with epoxy resin matrix.
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 fluorine-silicon-containing polyphosphate ester significantly enhances the flame retardancy of epoxy resin by forming protective layers, improving thermal stability and hydrophobic properties, while allowing for adjustable proportions of phosphorus, silicon, and fluorine, thus broadening the material's functional capabilities.
Implementation Method 1
forming protective carbon and silica layers, thereby improving thermal stability and flame retardancy
Implementation Method 2
Fluorine-containing compound, tin 2-ethylhexanoate and a second organic solvent are added to the silicon-containing cyclic phosphate ester monomer obtained in step (1), then solution is heated up to 35 ̃80° C. and reacted for 6-12 h
Data Source
AI summary
Disclosed are a fluorine-silicon-containing polyphosphate ester and method for preparation thereof, having a chemical structural formula of:wherein R1 isR2 isn=10˜100. The fluorine-silicon-containing polyphosphate ester of the present invention uses silicon phosphorus and fluorine for improving flame retardancy. Phosphorus catalyzes the system to form a phosphorus-rich carbon layer, performing a protective-layer function and thereby preventing further breakdown of the epoxy resin. The silicon-containing epoxy resin forms a silica-containing carbon layer during the process of combustion, strengthening the carbon-layer structure and further improving the protective function of the carbon-layer. The introduction of elemental fluorine improves the thermal stability of the epoxy resin, thereby improving the flame retardancy performance of the system.