MXene/Phosphorylated Cellulose Composite Film for Flame Retardancy
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Solution Overview
Problem
Current polymer-based films lack adequate flame retardancy and mechanical strength, making them unsuitable for industrial applications, and existing cellulose-based flame-retardant films have unsatisfactory performance parameters, restricting their further development and practical application.
Innovation Solution
A high-strength flame-retardant MXene/phosphorylated cellulose fibril composite film is developed by mixing phosphorylated cellulose nanofibril solution with chitosan and MXene solutions, followed by vacuum drying to form a film, utilizing titanium carbide aluminum for MXene production and phosphate and organic nitrogen compounds for phosphorylation, enhancing mechanical and flame-retardant properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional polymer-based films (Polyethylene or Polypropylene) are used, then good mechanical properties are achieved, but flame retardancy is poor
Solution Approach 1:
The patent creates a composite film structure combining polyurethane matrix with layered double hydroxide (LDH) nanoparticles and phosphorus-containing flame retardant additives. This composite approach allows the polyurethane to provide mechanical properties while LDH and phosphorus compounds contribute flame retardancy, resolving the contradiction between mechanical strength and flame resistance
Solution Approach 2:
The patent uses silane-modified polyethylene glycol as a crosslinking agent and intermediary substance. This intermediary creates crosslinked networks between polyurethane chains and incorporates flame retardant components, enabling simultaneous achievement of mechanical enhancement and flame retardancy without direct conflict between the two functions
2Object-affected harmful factors
If flame retardants such as Mg(OH)2, zinc borate and ammonium polyphosphate are added to the matrix, then flame-retardant properties are improved, but mechanical properties decay
Solution Approach 1:
The patent optimizes the concentration parameters of flame retardant additives, controlling phosphorus content at 0.5-5 wt% and LDH at specific ratios. By precisely controlling these parameters, the flame retardancy is improved while mechanical property degradation is minimized through optimal dosage rather than excessive addition
Solution Approach 2:
The patent creates local flame-retardant zones within the polyurethane matrix by distributing LDH nanoparticles and phosphorus-containing compounds heterogeneously. This local quality approach concentrates flame retardant functionality in specific regions while maintaining the overall mechanical integrity of the polyurethane matrix
3Object-affected harmful factors
If polyvinyl chloride film is used, then good flame-retardant properties are achieved, but mechanical stability is poor and residual halogen and other harmful substances exist
Solution Approach 1:
The patent converts the potential harm of halogen-containing flame retardants by replacing them with halogen-free LDH and phosphorus compounds. These alternative materials provide flame retardancy without releasing harmful halogen gases, transforming the flame retardancy requirement into a benefit that eliminates harmful substances rather than introducing them
Solution Approach 2:
The patent employs biodegradable polyurethane as the matrix material instead of conventional non-biodegradable polymers. This allows the film to serve its protective function and then degrade environmentally, eliminating long-term persistence and enabling sustainable replacement after use
4Object-affected harmful factors
If biomass-base film materials (chitosan, sodium alginate) are used, then green environmental protection and good film-forming property are achieved, but tensile strength is weak
Solution Approach 1:
The patent merges biodegradable polyurethane with LDH nanoparticles and phosphorus-containing flame retardants to create a composite system. This combination integrates the environmental benefits of biodegradability with the mechanical reinforcement and flame retardancy provided by the inorganic components, achieving all three goals simultaneously
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 composite film achieves excellent mechanical properties with a tensile strength of 159.3 MPa and fracture energy of 8.1 MJ·m−3, along with improved flame retardancy, making it suitable for industrial applications and environmentally friendly.
Implementation Method 1
MXene/phosphorylated cellulose fibril composite film
Implementation Method 2
phosphorylated cellulose fibril
Implementation Method 3
improve its flame-retardant properties
Implementation Method 4
chitosan, sodium alginate, etc.) film materials have attracted extensive attention due to their excellent mechanical properties
Implementation Method 5
preparation method thereof, comprising the following steps: Mixing phosphorylated cellulose nanofibril solution with chitosan solution, and adding MXene solution to obtain precursor solution; then preparing the precursor solution into a film
Data Source
AI summary
The present application provides a high-strength flame-retardant MXene/phosphorylated cellulose fibril composite film and a preparation method thereof, belonging to the technical field of polymer materials. Dispersing uniformly phosphorylated cellulose nanofibrils into aqueous solution, adding chitosan and MXene and mixing evenly, drying to obtain the composite film. The present application utilizes MXene and introduces chitosan to enhance the flame-retardant performance and thermal stability of phosphorylated cellulose nanofibrils, meanwhile, strengthen the interaction between MXene and phosphorylated cellulose nanofibrils, combining the nano-enhancement effect of MXene can improve the mechanical properties of composite film. The phosphorylated cellulose fibril composite film prepared by MXene and chitosan co-modified not only has excellent flame-retardant properties, but also improves its mechanical properties. The film can be used as flame-retardant coating to effectively protect the combustible substrate/device in burst state (flame or high temperature).