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Method for preparing polycaprolactam hollow fiber membrane

A polycaprolactam, fiber membrane technology, used in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of large flux and high porosity, and achieve large flux, high porosity, and solution phase separation. quick effect

Inactive Publication Date: 2014-10-29
SHANDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Aiming at the limitations of the existing technology, the technical problem to be solved in the present invention is to design a preparation method of PA6 hollow fiber membrane, which can avoid the corrosion of the equipment by the original solvent system, and prepare a hollow fiber with adjustable pore size and porosity. Membrane, with relatively few parameters to be adjusted, high porosity, and large flux; this method has the characteristics of simple process, low pollution, no special requirements for equipment conditions, low cost, easy continuous preparation process, and convenient industrial production

Method used

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  • Method for preparing polycaprolactam hollow fiber membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Add 600g of compound diluent (the mass ratio of N-E-O / PTSA to TEG is 10 / 0) ​​into the dissolution tank, add 600g of PA6 and 0.3g of antioxidant 1076 while stirring, slowly raise the temperature to 210°C, and stabilize for half an hour, Using the special spinneret for hollow fiber membranes, white oil as the core liquid, water at 20°C as the coagulation bath after spinning, extraction and washing in absolute ethanol for 18 hours, cold stretching for 1.5 times and drying in the air The PA6 hollow fiber membrane described above. Write it as (50%, 10 / 0, 20°C).

Embodiment 2

[0028] Add 600g of compound diluent (the mass ratio of N-E-O / PTSA to TEG is 10 / 0) ​​into the dissolution tank, add 400g of PA6 and 0.2g of antioxidant 1076 while stirring, slowly raise the temperature to 210°C, and stabilize for half an hour, Using the special spinneret for hollow fiber membranes, white oil as the core liquid, water at 20°C as the coagulation bath after spinning, extraction and washing in absolute ethanol for 18 hours, cold stretching for 1.5 times and drying in the air The PA6 hollow fiber membrane described above. Write it as (40%, 10 / 0, 20°C).

Embodiment 3

[0030] Add 650g of compound diluent (the mass ratio of N-E-O / PTSA to TEG is 10 / 0) ​​into the dissolution tank, add 350g of PA6 and 0.175g of antioxidant 1076 while stirring, slowly raise the temperature to 210°C, and stabilize for half an hour, Using the special spinneret for hollow fiber membranes, white oil as the core liquid, water at 20°C as the coagulation bath after spinning, extraction and washing in absolute ethanol for 18 hours, cold stretching for 1.5 times and drying in the air The PA6 hollow fiber membrane described above. Record it as (35%, 10 / 0, 20°C).

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Abstract

The invention discloses a method for preparing a polycaprolactam hollow fiber membrane. The method comprises the following steps: (1) slicing and drying, namely, slicing granular polycaprolactam, and drying for 6-8 hours in a vacuum drying oven at 100 DEG C; (2) preparing compound diluent, namely, uniformly stirring 20wt% to 100wt% of N-ethyl-o / p toluene sulfonamide and 2,2'-(Ethylenedioxy)diethanol, thereby obtaining the compound diluent; and (3) preparing the hollow fiber membrane, namely, slowly heating the compound diluent, 30wt% to 50wt% of PA6 and 0.05wt% of an antioxidant to be at about 210 DEG C in a dissolving kettle so as to prepare a spinning solution, with nitrogen or white oil as a core solution, curing to form a frozen rubber membrane after air bath and coagulating bath, extracting the frozen rubber membrane for 18 hours by using ethanol or diethyl ether, and subsequently performing cold drawing, thereby obtaining the PA6 hollow fiber membrane. The hollow fiber membrane prepared by using the method can be applied to the fields of water treatment, affine separation and the like, and has the characteristics of simple process, convenience in industrial production and the like.

Description

technical field [0001] The invention relates to a preparation method of a hollow fiber membrane, in particular to a preparation method of a hollow fiber membrane used for water treatment, protein purification and affinity separation, and belongs to the technical fields of water treatment and biochemical industry. Background technique [0002] PA6 is a general-purpose engineering plastic with a long history and a wide range of uses. Due to its excellent performance and good application effect, its output has maintained steady growth in the fierce competition with other engineering plastics. It was once called an epoch-making engineering plastic. Nylon has developed rapidly since its inception until the 1950s. In the 1990s, it was given special functions through modification, which promoted the development of nylon from general-purpose plastics to engineering plastics and functional plastics. PA6 has good comprehensive properties such as mechanical properties, heat resistance,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/08B01D67/00
Inventor 姜兆辉李志迎贾曌王婧肖长发
Owner SHANDONG UNIV OF TECH
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