Fiber Masterbatch Heat Resistance Processing
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Solution Overview
Problem
Engineering plastics, such as polyetherimide and poly(vinylidene fluoride), face limitations in applicability due to high processing temperatures and potential corrosive byproduct generation during high-temperature molding, which restricts their use in various fields.
Innovation Solution
A fiber masterbatch comprising polyetherimide, polyethylene terephthalate, and a polyimide with specific glass transition and thermogravimetric loss temperatures, and viscosity ranges, which enhances melt processability, flexibility, heat resistance, and flame retardancy, preventing dripping after combustion, and is suitable for textiles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If polyetherimide is used for high-temperature applications, then heat resistance is improved, but processing temperature becomes too high for general machines
Solution Approach 1:
The patent creates a composite material system consisting of polyetherimide (PEI) as the base polymer, polyethylene terephthalate (PET) as a secondary component, and a specifically designed polyimide modifier. This composite approach allows the material to maintain the high heat resistance of PEI while the PET and polyimide components modify the processing characteristics to enable lower processing temperatures suitable for general manufacturing machines.
2Ease of manufacture
If poly(vinylidene fluoride) is subjected to high-temperature molding, then processing is achieved, but hydrofluoric acid is generated which has strong corrosivity
Solution Approach 1:
The patent addresses the harmful byproduct generation issue by selecting polymer components (PEI, PET, and polyimide) that undergo thermal decomposition at temperatures below those required for PVDF processing. The polyimide component specifically decomposes around 500-550°C, releasing benign gases (CO, CO2, H2O, NH3) instead of corrosive hydrofluoric acid, thereby converting the potential harm of high-temperature processing into a beneficial low-corrosion processing environment.
3Reliability
If engineering plastics are used to improve heat resistance and flame retardancy, then thermal performance is improved, but processing temperature becomes excessively high
Solution Approach 1:
The patent utilizes parameter changes in the polyimide component, specifically controlling its glass transition temperature (140-170°C) and viscosity characteristics (80-230 cP at 15 wt% in NMP). These parameter optimizations allow the polyimide to effectively modify the thermal and rheological properties of the composite, enabling the material to achieve good flame retardancy and heat resistance while maintaining processability at reduced temperatures.
Data Source
AI summary
A fiber masterbatch including a polyetherimide, a polyethylene terephthalate, and a polyimide is provided. A glass transition temperature of the polyimide is between 140° C. and 170° C., a 10% thermogravimetric loss temperature of the polyimide is between 500° C. and 550° C., and when the polyimide is dissolved in N-methyl-2-pyrrolidone and a solid content of the polyimide is 15 wt %, a viscosity of the polyimide is between 80 cP and 230 cP. A melt spun fiber obtained by using the fiber masterbatch is also provided.