Colored Polyimide Molded Article via Soluble Coloring Precursor
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Solution Overview
Problem
The production of colored polyimide molded articles, such as films and porous membranes, often requires the use of pigments like carbon black, which are difficult to uniformly disperse and can lead to surface appearance issues and increased labor and costs due to staining of production lines, necessitating specialized equipment and cleaning processes.
Innovation Solution
A process involving the use of a polyamic acid or polyimide solution composition with a coloring precursor that thermally decomposes to a black color at 250°C or higher, eliminating the need for pigments and allowing for uniform coloring and easy cleaning, while maintaining surface quality and compatibility with the polymer solution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If pigments such as carbon black are used for coloring polyimide molded articles, then heat resistance is improved, but uniform dispersion in the resin becomes difficult and surface appearance deteriorates
Solution Approach 1:
The invention changes the physical state of the coloring agent from particulate (pigment) to molecular (soluble coloring agent). By using a coloring agent that dissolves in the polyamic acid solution, uniform dispersion is achieved at the molecular level, eliminating the dispersion problems associated with pigments while maintaining heat resistance through the polyimide matrix.
Solution Approach 2:
The invention uses a soluble coloring agent that can be easily incorporated into the polyamic acid solution without requiring special handling or modification of pigment surfaces. This approach simplifies the manufacturing process and eliminates the need for complex dispersion techniques while achieving uniform coloring.
2Temperature
If pigments such as carbon black are used for coloring, then heat resistance is improved, but production line cleaning becomes difficult and costs increase
Solution Approach 1:
The invention extracts the problematic particulate pigment from the system and replaces it with a soluble coloring agent. This eliminates the staining issue on production lines because the coloring agent dissolves completely in the polyamic acid solution and does not leave residual particles that would require extensive cleaning.
Solution Approach 2:
The invention replaces the mechanical mixing and dispersion process required for pigments with a simple dissolution process. The coloring agent naturally dissolves in the polyamic acid solution, eliminating the need for intensive mechanical kneading and special dispersion equipment, thereby simplifying production line cleaning.
3Manufacturing precision
If dyes are used for coloring polyimide molded articles, then uniform dispersion is achieved, but dye elution occurs due to solvent influence
Solution Approach 1:
The invention creates a composite system where the coloring agent is integrated into the polyamic acid solution matrix. The coloring agent forms a unified structure with the polymer matrix during imidization, creating a composite material where the color is locked into the polymer structure rather than being a separate phase that can be eluted.
Solution Approach 2:
The invention changes the chemical state of the coloring agent from a separate dye molecule that can be eluted to an integrated component of the polyimide structure. Through the imidization process, the coloring agent becomes part of the crosslinked polymer network, preventing elution while maintaining uniform distribution.
4Temperature
If pigments are used for coloring, then heat resistance is improved, but surface appearance and uniformity become difficult to achieve
Solution Approach 1:
The invention changes the physical state of the coloring agent from particulate to molecular/dissolved state. This allows the color to be uniformly distributed at the molecular level throughout the polyimide matrix, producing a homogeneous surface appearance without the aggregation or uneven distribution problems associated with particulate pigments.
Solution Approach 2:
The invention achieves complete homogeneity by using a coloring agent that dissolves in the polyamic acid solution. The coloring agent distributes uniformly throughout the solution and becomes an integral part of the polyimide matrix during imidization, ensuring consistent color and surface appearance throughout the molded article.
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
This method enables the production of colored polyimide molded articles with excellent surface appearance and reduced production costs, as the coloring precursor is uniformly dissolved and stable at high temperatures, reducing the need for specialized equipment and simplifying the production process.
Implementation Method 1
a coloring precursor which is spontaneously thermally decomposed, carbonized and colored in a thermal imidization step
Implementation Method 2
when heated at 250° C. or higher, it is colored in a black based color
Data Source
AI summary
Disclosed is a process for production of a colored polyimide molded article including the steps of molding a polyamic acid solution composition containing a polyamic acid solution obtained from at least a tetracarboxylic acid component and a diamine component and a coloring precursor, or a polyimide solution composition containing a polyimide solution and a coloring precursor; and then thermally treating a molded product at 250° C. or higher.