Preparation method of colored hollow fiber membrane

A fiber membrane and hollow technology, applied in the field of separation membranes, can solve problems such as high temperature, high requirements for colorant selection, and poor gloss

Inactive Publication Date: 2009-06-10
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0016] In the preparation process of the colored hollow fiber membrane, the present invention keeps the original solution or melt spinning membrane making process as unchanged as possible to ensure that the coloring process does not affect or less affects the various properties of the obtained hollow fiber membrane and the membrane products. subsequent use.

[0017] Specifically, the present invention can select different pigments according to the requirements of product design color and luster: for example, white, titanium dioxide pigment can be selected; titanium dioxide has pure whiteness, high refractive index to light, uniform particle size, good resistance to light and heat The effect is stable and chemically inert; black, you can choose carbon black pigment; the particle size of carbon black can be selected according to your needs, the smaller the particle size, the darker the color; yellow, you can choose iron oxide yellow; the pigment has a strong Alkali resistance, b...

Embodiment 1

[0022] A polypropylene hollow fiber membrane is prepared by a conventional melt spinning method (for example, referring to Example 1 in Patent Document No. ZL90100317). When other conditions remain unchanged, 0.2% by mass of polypropylene, Titanium dioxide with an average particle size of 0.05 microns; the titanium dioxide is first dispersed by a dispersant titanate, that is, the dispersant and the pigment used are fully and uniformly blended by a high-speed stirring pulverizer, and then added to the film-forming raw material Spinning in the system; the dosage of the dispersant is 0.1% of the mass of titanium dioxide to prepare a colored polypropylene hollow fiber membrane. The air flux of the obtained colored hollow membrane is slightly increased (the degree of increase is less than 5%), and the whiteness is obviously increased, which is called a white polypropylene hollow membrane.

Embodiment 2

[0024] A polyvinylidene fluoride hollow fiber membrane is prepared by a conventional melt spinning method (for example, referring to Example 1 in Patent Document No. ZL200410067002.9). Carbon black with an average particle size of 0.08 microns and 0.5% by mass of vinyl fluoride, wherein the carbon black is dispersed by a dispersant white paraffin, and the amount of the dispersant is 1% of the mass of the carbon black. The rest are the same as embodiment 1. The obtained colored hollow membrane appears black when the air flux is slightly increased (increasing degree is less than 5%), that is, the black polyvinylidene fluoride hollow membrane.

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PUM

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08
Inventor 肖长发胡哓宇梁海先
Owner TIANJIN POLYTECHNIC UNIV
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