Colored polyimide fiber as well as preparation method and application thereof
By using a dynamic mixer to uniformly mix the pigment with the spinning liquid after defoaming, the problems of spinning process instability and color unevenness caused by the agglomeration of pigment particles are solved, and the preparation of colored polyimide fibers with high color fastness and color uniformity is achieved.
CN119736728APending Publication Date: 2025-04-01JIANGSU XIANNUO NEW MATERIAL TECH
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Patent Information
- Application Number
- CN202411928838.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-25
- Publication Date
- 2025-04-01
AI Technical Summary
Technical Problem
In the existing stock liquid coloring technology, pigment particles are prone to agglomeration during stand-alone defoaming, resulting in instability of the spinning process and inhomogeneity of the fiber color.
Method used
After the spinning liquid is defoamed, the pigment dispersion liquid is uniformly mixed with the spinning liquid to avoid long-term staying and agglomeration of pigment particles, and spinning directly.
Benefits of technology
It improves the uniformity of fiber color and process stability, maintains high color fastness in the raw liquid coloring process, and has better process flexibility, and can adjust the fiber color according to needs.
✦ Generated by Eureka AI based on patent content.
Abstract
The invention provides a colored polyimide fiber as well as a preparation method and application thereof, the fiber comprises an organic or inorganic pigment, and the content of the pigment is 0.2-10 wt% of the total mass of the polyimide fiber; in the same roll of colored polyimide fiber, four points are randomly selected, and the maximum color difference is less than or equal to 2. The preparation method comprises the following steps: firstly, mixing a dried organic or inorganic pigment with a surfactant, adding a proper amount of a solvent, dispersing to prepare a dispersion liquid containing pigment particles, respectively conveying a defoamed polyamide acid spinning solution and the pigment dispersion liquid to a feeding hole of a dynamic mixer through a pipeline under the pushing of a metering pump, and feeding the mixture into the dynamic mixer; mixing the two components in a dynamic mixer, and obtaining the colored polyimide fiber by adopting a wet / dry-wet spinning process. The production process adopts stock solution coloring and has the advantages of good color uniformity and high color fastness, and the method is simple in process and low in production cost.
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