Preparation method of colored hollow fiber membrane

Abstract

The invention relates to a preparation method for a colored hollow fiber membrane. The preparation method is characterized in that firstly pigments are selected according to the color design requirement of a product and are added into a membrane forming material system together with a dispersant after being evenly mixed with the dispersant through high-speed agitation; a conventional solution spinning method or a fusion spinning method is adopted to prepare the hollow fiber membrane; the pigments are one or more of titanium white, carbon black, ferric oxide yellow, organic pigment yellow 138, iron red, organic pigment red 122 and / or ultramarine; the average grain size of the pigments is less than 10 microns; the dosage of the pigments is 0.2 to 5 percent of the mass of polymers in the membrane forming material system; the dispersant can be titanate, white paraffin or Tween-80; and the dosage of the dispersant is 0.1 to 3.0 percent of the mass of the pigments.

Description

technical field [0001] The invention relates to separation membrane technology, in particular to a preparation method for producing colored hollow fiber membranes by selecting appropriate coloring agents without affecting the traditional membrane-making process and the performance of obtained products. Background technique [0002] The main color of existing hollow fiber membranes is white, and the color of some hollow fiber membrane materials is milky white or light yellow (this color is mostly due to incomplete washing of porogens (such as polyethylene glycol, polyvinylpyrrolidone) or surfactants. etc.), there are shortcomings such as single color and poor gloss, and it is difficult to meet the wider use requirements of hollow fiber membrane materials. Although both the solution spinning method and the melt spinning method can prepare hollow fiber membranes, from the perspective of coloring, the preparation of hollow fiber membranes by melt spinning is much more difficult ...

AI Technical Summary

Problems solved by technology

[0002] The main color of existing hollow fiber membranes is white, and the color of some hollow fiber membrane materials is milky white or light yellow (this color is mostly due to incomplete washing of porogens (such as polyethylene glycol, polyvinylpyrrolidone) or surfactants. etc.), there are shortcomings such as single color and poor gloss, and it is difficult to meet the wider use requirements of hollow fiber membrane materials

Although both the solution spinning method and the melt spinning method can prepare hollow fiber membranes, from the perspective of coloring, the preparation of hollow fiber membranes by melt spinning is much more difficult than the solution spinning method, because the spinning method of the melt spinning method is more difficult. The temperature of the silk film forming process is higher, the process conditions are more stringent, and the selection of colorants is more demanding

Within the scope of the applicant's search, neither the solution spinning method nor the melt spinning membrane has been seen in the patent literature and other related research literature reports on the preparation of colored hollow fiber membranes.