High-whiteness Polyimide Microfiber via HTDA Diamine Structure
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Solution Overview
Problem
Existing high-whiteness fiber materials, such as cotton, polyvinyl alcohol, and polyethylene fibers, lack temperature resistance and cannot meet the requirements of high-tech fields, while traditional polyimide fibers have dark colors due to strong molecular conjugation.
Innovation Solution
A high-whiteness polyimide microfiber is developed using a polyimide resin obtained from the reaction of wholly alicyclic dianhydride HTDA and an aromatic diamine monomer containing methyl or trifluoromethyl, followed by chemical imidization and electrostatic spinning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional wholly aromatic polyimide is used, then temperature resistance is achieved, but the fabric shows dark color from dark brown to yellow due to strong conjugation interactions
Solution Approach 1:
The patent changes the chemical structure parameters of the polyimide by using wholly alicyclic dianhydride HTDA combined with aromatic diamine monomers containing methyl or trifluoromethyl groups. This structural modification reduces the conjugation length while maintaining temperature resistance, thereby improving whiteness without sacrificing thermal stability
Solution Approach 2:
The patent creates a composite molecular structure combining alicyclic dianhydride HTDA with aromatic diamine monomers (such as DMBZ or TFMB). This composite approach allows the material to inherit both the temperature resistance from the aromatic components and the reduced conjugation from the alicyclic structure, achieving high whiteness while maintaining thermal performance
2Illumination intensity
If mineral fillers such as titanium dioxide are added to improve whiteness, then whiteness and opacity are improved, but the contents of added pigments are very large which affects mechanical property and additional production processes increase cost
Solution Approach 1:
The patent extracts and eliminates the need for mineral fillers by achieving intrinsic high whiteness through molecular structure design. The wholly alicyclic polyimide structure naturally provides high whiteness without requiring additional titanium dioxide or other mineral additives, thereby maintaining mechanical properties and reducing production complexity
Solution Approach 2:
The patent changes the fundamental approach to achieving whiteness by modifying the polymer's molecular structure rather than adding external additives. The use of HTDA and aromatic diamine monomers with methyl or trifluoromethyl groups creates an intrinsically white material that maintains both optical and mechanical properties without compromise
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 polyimide microfiber exhibits excellent heat-resistant stability, good solubility, and ultrahigh whiteness, making it suitable for high-tech applications such as personal protective equipment and electronic components.
Implementation Method 1
polyimide obtained from the reaction of wholly alicyclic dianhydride HTDA and an aromatic diamine monomer by chemical imidization
Implementation Method 2
precipitating the soluble polyimide solution into absolute ethanol to obtain the polyimide resin
Implementation Method 3
electrostatic spinning
Data Source
AI summary
The present disclosure discloses a high-whiteness polyimide microfiber and a preparation method thereof and use. The polyimide fiber includes polyimide obtained from the reaction of wholly alicyclic dianhydride HTDA and an aromatic diamine monomer containing methyl or trifluoromethyl by chemical imidization. In the present disclosure, the polyimide microfiber has both excellent heat-resistant stability and spinning film-forming property, and the fabric has ultra-high whiteness. The microfiber fabric prepared from the polyimide fiber may be used as a component with high-temperature resistant and high-whiteness in personal protective equipment such as mask and protective clothing, and also may be used as an electronic component in the high-tech field such as aerospace, optoelectronic, microelectronic and automobile.