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CN-116392983-B - Flame-retardant polyolefin hollow fiber membrane and preparation method thereof

CN116392983BCN 116392983 BCN116392983 BCN 116392983BCN-116392983-B

Abstract

The invention discloses a flame-retardant polyolefin hollow fiber membrane and a preparation method thereof, wherein the flame-retardant polyolefin hollow fiber membrane comprises the following raw materials, by mass, 20% -50% of polyolefin, 20% -50% of flame retardant and 20% -70% of diluent, and the flame retardant is in a powdery form. The invention can solve the problems of low ignition point and immaterial flame retardance of the material matrix of the polyolefin hollow fiber membrane, thereby widening the application range of the polyolefin hollow fiber membrane.

Inventors

  • ZHENG HAIRONG
  • JIA WEI
  • PENG XIAOQUAN
  • LUO ZHONGYUAN
  • LIU XIAOZHEN
  • PENG JINGJUN

Assignees

  • 深圳高性能医疗器械国家研究院有限公司

Dates

Publication Date
20260505
Application Date
20230426

Claims (6)

  1. 1. The flame-retardant polyolefin hollow fiber membrane is characterized by comprising the following raw materials in percentage by mass: 20% -50% of polyolefin, 20% -30% of organic flame retardant, 0.1% -5% of flame-retardant auxiliary agent, 1% -5% of antioxidant and 20% -58% of diluent; The organic flame retardant is powdery, the organic flame retardant is a nitrogen-phosphorus intumescent flame retardant, and the flame retardant auxiliary agent comprises polytetrafluoroethylene micropowder and/or triazine compound micropowder.
  2. 2. The flame retardant polyolefin hollow fiber membrane according to claim 1, wherein the total mass percentage of the flame retardant co-agent and the organic flame retardant is 20% -25%.
  3. 3. The flame-retardant polyolefin hollow fiber membrane according to claim 1, wherein the nitrogen-phosphorus intumescent flame retardant comprises ADK STAB FP-2000 series, and the triazine compound micropowder comprises poly-2-ethanolamine-4, 6-ethylenediamine-1, 3, 5-triazine with a molecular formula (C 7 H 12 ON 6 ) n , wherein n=15-35).
  4. 4. The flame retardant polyolefin hollow fiber membrane of claim 1, wherein the polyolefin comprises one or more of polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene acrylate copolymer, poly 1-butene, poly 1-pentene, poly 1-hexene, poly 1-octene, poly (4-methyl-1-pentene), and polycycloolefin; the diluent comprises one or more than two of diethyl phthalate, dibutyl phthalate, di-n-octyl phthalate, di (2-ethylhexyl) phthalate, dibutyl terephthalate and di-n-octyl terephthalate, di (2-ethylhexyl) terephthalate and diphenyl ether.
  5. 5. The flame retardant polyolefin hollow fiber membrane of claim 1 wherein the antioxidant comprises one or more of tris (2, 4-di-t-butylphenyl) phosphite, 2, 6-di-t-butyl-p-cresol, pentaerythritol tetrakis (3-laurylthiopropionate), N-octadecyl beta- (3, 5-di-t-butyl-4-hydroxyphenyl) propionate and N, N' -bis- (3, 5-di-t-butyl-4-hydroxyphenyl) propionyl) hexanediamine.
  6. 6. A method for preparing the flame retardant polyolefin hollow fiber membrane according to any one of claims 1 to 5, comprising the following steps: Melting all components of the raw materials to obtain a casting solution; Extruding the casting solution through an annular spinneret, and allowing the casting solution to enter a cooling bath through an air gap for solidification to obtain a hollow fibrous primary membrane; Extracting the primary membrane, removing the diluent to form a microporous structure, and obtaining a secondary membrane; and drying the secondary membrane to obtain the flame-retardant polyolefin hollow fiber membrane.

Description

Flame-retardant polyolefin hollow fiber membrane and preparation method thereof Technical Field The invention relates to the technical field of separation filtering membranes, in particular to a flame-retardant polyolefin hollow fiber membrane and a preparation method thereof. Background Hollow fiber membranes are shaped fibers having an axial cavity, a porous structure in cross section, and a fiber-like appearance. The hollow structure gives the fiber good heat retention, fluffiness and other specific properties and styles, and the porous structure can selectively permeate/adsorb fluid, so that the mixed fluid is separated and enriched. The hollow fiber membrane has selective adsorption capacity to water, gas, blood and other fluid, and has important application in the field of filtering separation. The hollow fiber membrane is mainly composed of polyacrylonitrile, cellulose and its derivatives, polyolefin, polyester, poly (ether) sulfone, and fluororesin. The polyolefin hollow fiber membrane represented by polypropylene has relatively low price of raw materials and mature production process, and is the hollow fiber membrane with the highest yield, the most wide application and the largest specification. However, polyolefin materials represented by polypropylene are inflammable materials, have large fire hazards, and are limited to be used in fields with high fire protection requirements, for example, when the separated gas is combustion-supporting gas (oxygen, nitrogen dioxide, chlorine, fluorine gas, etc.) and combustible gas (carbon monoxide, hydrogen, methane, ethylene, propyne, etc.), a certain flame retardant level is required. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides a flame-retardant polyolefin hollow fiber membrane and a preparation method thereof, which solve the problems of low ignition point and immaterial flame retardance of a material matrix of the polyolefin hollow fiber membrane, thereby widening the application range of the polyolefin hollow fiber membrane. In order to achieve the above purpose, the technical scheme of the invention is as follows: The flame-retardant polyolefin hollow fiber membrane comprises the following raw materials in percentage by mass: 20% -50% of polyolefin, 20% -50% of flame retardant and 20% -58% of diluent; Wherein the flame retardant is in a powder form. The invention also discloses a preparation method of the flame-retardant polyolefin hollow fiber membrane, which comprises the following steps: Melting all components of the raw materials to obtain a casting solution; Extruding the casting solution through an annular spinneret, and allowing the casting solution to enter a cooling bath through an air gap for solidification to obtain a hollow fibrous primary membrane; Extracting the primary membrane, removing the diluent to form a microporous structure, and obtaining a secondary membrane; and drying the secondary membrane to obtain the flame-retardant polyolefin hollow fiber membrane. The implementation of the embodiment of the invention has the following beneficial effects: According to the embodiment of the invention, the polyolefin hollow fiber membrane has an intrinsic flame retardant function by adding the flame retardant, so that the application range of the polyolefin hollow fiber membrane is widened. The preparation process of the hollow fiber membrane comprises an extraction step, wherein the extraction step is used for removing the diluent to form a microporous structure in the cross section direction, and the powdery flame retardant is not dissolved by the extractant, so that the loss of the flame retardant in the extraction step can be avoided on one hand, and on the other hand, if the liquid flame retardant is used, the amount of the liquid flame retardant extracted by the extractant is not controlled, and cannot be estimated, so that the stable control of the porosity, the pore size and the pore distribution of the microporous structure in the cross section is not facilitated, and the unstable performance of the hollow fiber membrane can be caused. Drawings In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein: FIG. 1 is a schematic diagram showing a macroscopic structure of flame-retardant polyolefin hollow fiber membrane filaments collected on a filament winding wheel according to an embodiment of the present invention. FIG. 2 is a microstructure of a single filament cross section of a flame retardant polyolefin hollow fiber membrane filament made in accordance with an embodiment of t