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Thermoplastic polyurethane hollow fiber membrane and preparation method thereof

A thermoplastic polyurethane and fiber membrane technology, which is applied in the production of hollow filaments, chemical characteristics of fibers, chemical instruments and methods, etc., to achieve the effect of high flux, not easy to disperse, and evenly dispersed

Inactive Publication Date: 2013-03-20
HUIZHOU QIXIN MEMBRANE PURIFICATION & ENVIRONMENTPROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The non-solvent-induced phase separation method and the melt spinning-stretching pore-forming method for the production of hollow fiber membranes from thermoplastic polyurethane have been patented, but there is no report on the preparation of thermoplastic polyurethane hollow fiber membranes by thermally induced phase separation.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1: take by weight 43% thermoplastic polyurethane, 24% dioctyl phthalate, 11% dioctyl adipate, 21.7% nano calcium carbonate, 0.1% tetrakis [β-(3 ', 5 '-Di-tert-butyl-4'-hydroxyphenyl) propionate] pentaerythritol ester, 0.2% tris (2,4-di-tert-butylphenyl) phosphite, mix uniformly with a mixer, and the mixed material passes through 200 ℃, a twin-screw extruder with a length-to-diameter ratio of 32:1 for melt extrusion and granulation. Type spinneret, the central tube of the spinneret is fed with nitrogen, extruded into hollow fibers, and then enters a 40°C water tank through an air distance of 15cm to cool and form, and the formed hollow fibers are collected by a wire winding wheel. The collected hollow fibers were extracted with ethanol and hydrochloric acid to extract the thinner dioctyl phthalate, dioctyl adipate and inorganic pore-forming agent calcium carbonate, and the outer diameter of the thermoplastic polyurethane hollow fiber membrane obtained was 1.25...

Embodiment 2

[0039] Embodiment 2: take by weight 50% thermoplastic polyurethane, 25% dioctyl phthalate, 10% dibutyl phthalate, 14.7% nano-calcium carbonate, 0.1% tetrakis [beta-(3 ', 5'-di-tert-butyl-4'-hydroxyphenyl) propionate] pentaerythritol ester, 0.2% tris(2,4-di-tert-butylphenyl) phosphite, mix evenly with a mixer, and the mixed materials pass through A twin-screw extruder at 210°C and a length-to-diameter ratio of 32:1 is melt-extruded for granulation. Tubular spinneret, the central tube of the spinneret is fed with nitrogen, extruded into hollow fibers, and then enters a 30°C water tank through an air distance of 15cm to cool and form, and the formed hollow fibers are collected by a winding wheel. The collected hollow fibers were extracted with ethanol and hydrochloric acid to extract the thinners dioctyl phthalate, dibutyl phthalate and inorganic pore-forming agent calcium carbonate, and the outer diameter of the prepared thermoplastic polyurethane hollow fiber membrane was 1.24m...

Embodiment 3

[0040] Embodiment 3: take by weight 40% thermoplastic polyurethane, 25% diisooctyl phthalate, 15% dibutyl phthalate, 19.7% fumed nano silicon dioxide, 0.1% β-(4' -Hydroxy-3', 5'-di-tert-butylphenyl) octadecyl propionate, 0.2% tris(2,4-di-tert-butylphenyl) phosphite, mix well with a mixer, mix well The material is melt-extruded and granulated by a twin-screw extruder at 175°C and a length-to-diameter ratio of 32:1, and the granulated material is melt-extruded by a single-screw extruder with a length-to-diameter ratio of 24:1 at 170°C , through the sleeve-type spinneret, the central tube of the spinneret is fed with nitrogen, extruded into hollow fibers, and then enters a 25°C water tank through an air distance of 15cm to cool and form, and the formed hollow fibers are collected by a winding wheel. The collected hollow fibers are respectively extracted with n-hexane and sodium hydroxide to diluent di-isooctyl phthalate, dibutyl phthalate and inorganic pore-forming agent silicon ...

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Abstract

The invention discloses a thermoplastic polyurethane hollow fiber membrane and a preparation method thereof. The hollow fiber membrane is made of polyurethane and prepared by adopting a thermally induced phase separation process. The preparation method comprises the following steps of: mixing thermoplastic polyurethane, thinner, inorganic pore-forming agent and antioxidant uniformly by using a high-speed stirrer, melting and extruding the mixture into granules by using a double-screw extruder, then melting and extruding the granules into hollow fibers by using a single-screw extruder, performing cooling molding, and finally extracting the thinner and the inorganic pore-forming agent in the hollow fibers. The prepared thermoplastic polyurethane hollow fiber membrane has the advantages of high flux, tensile strength and compressive strength, good flexibility of membrane silks, high elongation of the membrane silks at break, good chemical tolerance, permanent hydrophilic property, dry storage and the like. The fiber membrane can be applied to filtration of household and commercial drinking water, filtration and purification of brewed wine, food and medicaments, municipal tap water and sewage treatment, industrial sewage treatment, sea water desalinization pretreatment and the like.

Description

technical field [0001] The invention relates to a thermoplastic polyurethane hollow fiber membrane and a preparation method thereof-thermally induced phase separation method. Background technique [0002] In recent years, the industry has developed rapidly, but at the same time, the pollution to the environment has become more and more serious. The waste gas, waste liquid, and solid waste slag discharged from the factory have greatly polluted the surrounding environment. Threat to the human living environment. Membrane separation technology has developed rapidly in the past 20 to 30 years. Compared with traditional separation methods, membrane separation methods have the advantages of low energy efficiency, simple process, and no pollution to the environment. Membrane separation technology is widely used in chemical industry, food, medicine, electronics, etc. Wastewater treatment of industrial, electric power and other industries, municipal tap water and sewage treatment, h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/54B01D67/00B01D69/08D01D5/24D01D5/08
Inventor 刘冠文
Owner HUIZHOU QIXIN MEMBRANE PURIFICATION & ENVIRONMENTPROTECTION
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