Flame-Retardant Composite Fabric With Chitosan–Starch Surface Layer
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Solution Overview
Problem
Existing flame-retardant composite fabrics, primarily made with polyester resins, are not environmentally friendly due to low biodegradability and can cause air pollution, and they lack physical and chemical durability.
Innovation Solution
A composite fabric is created by applying a mixture of a powdery flame retardant and a thermoplastic starch composite, including corn starch, to a flax fabric, followed by compression molding using a hot press, incorporating chitosan and ammonium polyphosphate as flame retardants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyester resins containing flame retardants are used to make flame-retardant composite fabrics, then flame retardancy is achieved, but environmental friendliness deteriorates due to low biodegradability and air pollution
Solution Approach 1:
The patent changes the chemical composition parameters of the flame retardant from traditional halogenated or non-halogenated compounds to a specific mixture containing chitosan (3-9 parts by weight) and ammonium polyphosphate. This parameter change maintains flame retardancy while improving biodegradability and environmental compatibility, directly resolving the contradiction between reliability and environmental friendliness
Solution Approach 2:
The patent uses a composite flame retardant system combining chitosan (a biodegradable natural polymer) with ammonium polyphosphate. This composite approach leverages the biodegradability and environmental friendliness of chitosan while ammonium polyphosphate provides effective flame retardancy, thus achieving both reliability and environmental compatibility simultaneously
2Reliability
If traditional flame-retardant composite fabrics are used, then flame protection is provided, but physical and chemical durability is insufficient
Solution Approach 1:
The patent creates a composite fabric structure combining flax fabric (providing mechanical strength and durability) with thermoplastic starch composite coating (providing flame retardancy). This composite structure allows each component to contribute its superior properties, achieving both flame protection and enhanced physical-chemical durability
Solution Approach 2:
The patent applies flame retardant coating selectively to the surface of the flax fabric rather than throughout the entire material structure. The flax fabric core provides mechanical durability while the surface coating provides flame protection, optimizing both properties in their respective locations
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 fabric is environmentally friendly, physically and chemically durable, and provides excellent flame retardancy, making it suitable for fireproof clothing with enhanced tensile strength and modulus.
Implementation Method 1
subjecting the flax fabric to compression molding using a hot press
Implementation Method 2
subjecting the flax fabric to compression molding using a hot press
Implementation Method 3
subjecting the flax fabric to compression molding using a hot press
Data Source
AI summary
Provided is a method for preparing a flame-retardant composite fabric, the method sequentially including: a solution preparation step of mixing water with glycerol while heating them at a temperature of 60 to 80° C., thereby preparing a glycerol solution; a composite preparation step of adding powdery corn starch to the glycerol solution to obtain a glycerol/corn starch mixture, continuously stirring the glycerol/corn starch mixture, allowing the stirred glycerol/corn starch mixture to stand for a predetermined time, and then grinding the glycerol/corn starch mixture, thereby preparing a powdery thermoplastic starch composite; a powder application step of applying the powdery thermoplastic starch composite to a surface of a sheet-like flax fabric; and a hot-press molding step of subjecting the flax fabric with the thermoplastic starch composite applied thereto to compression molding using a hot press, thereby preparing a flame-retardant composite fabric; and also provides a flame-retardant composite fabric prepared thereby.