A kind of preparation method of hydrophilic polytetrafluoroethylene flat membrane

A technology of polytetrafluoroethylene and flat membrane, which is applied in the direction of chemical instruments and methods, membranes, membrane technology, etc. It can solve the problems of unsustainable modification effect, easy to appear holes, and different performances.

Active Publication Date: 2020-11-24
杭州骥海过滤科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The former is prone to holes due to the biaxial stretching of the flat film; the latter is difficult to integrate with other materials due to the inertness of the PTFE material, and it is prone to the modification effect not lasting or different positions. performance problem

Method used

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  • A kind of preparation method of hydrophilic polytetrafluoroethylene flat membrane
  • A kind of preparation method of hydrophilic polytetrafluoroethylene flat membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1. Relaxation treatment: wrap the PTFE flat film in a roll, place it in a closed container filled with water at a temperature of 130°C for 24 hours, then cool it down to 25°C at a rate of 1°C / min, take it out, and form a relaxed polymer Tetrafluoroethylene flat film;

[0031] 2. Filling: After uniformly mixing silica nanoparticles, ethanol, water, and γ-methacryloxypropyltrimethoxysilane according to the weight percentage of 1:3:0.1:0.01, the required filling material is obtained. The filling material is evenly scraped on the loose polytetrafluoroethylene flat film by a scraper to form a filled polytetrafluoroethylene flat film;

[0032] 3. Coating: Polyethylene glycol (600) diacrylate, acrylic acid, N,N-methylenebisacrylamide, azobisisobutyronitrile, and ethanol are mixed according to the weight percentage 1:3:0.01:0.01:10 After uniform mixing, the desired coating material is obtained, and the coating material is evenly scraped on the filled polytetrafluoroethylene fl...

Embodiment 2

[0039] 1. Relaxation treatment: wrap the PTFE flat film in a roll, place it in a closed container with water at 150°C for 10 hours, then cool it down to 25°C at a rate of 3°C / min, take it out, and form a relaxed polymer Tetrafluoroethylene flat film;

[0040] 2. Filling: Evenly mix silica nanoparticles, ethanol, water, and γ-methacryloxypropyltrimethoxysilane according to the weight percentage of 1:5:0.2:0.02 to obtain the required filling material. The filling material is evenly scraped on the loose polytetrafluoroethylene flat film by a scraper to form a filled polytetrafluoroethylene flat film;

[0041] 3. Coating: Polyethylene glycol (600) diacrylate, acrylic acid, N,N-methylenebisacrylamide, azobisisobutyronitrile, and ethanol are mixed according to the weight percentage 1:5:0.03:0.03:40 Mix evenly to obtain the required coating material, and scrape the coating material evenly on the filled polytetrafluoroethylene flat film with a scraper to form a coated polytetrafluoro...

Embodiment 3

[0046] 1. Relaxation treatment: wrap the PTFE flat film in a roll, place it in an airtight container filled with water at a temperature of 140°C for 18 hours, then cool it down to 25°C at a rate of 2°C / min, take it out, and form a relaxed polymer Tetrafluoroethylene flat film;

[0047] 2. Filling: Evenly mix silica nanoparticles, ethanol, water, and γ-methacryloxypropyltrimethoxysilane according to the weight percentage of 1:4:0.15:0.015 to obtain the required filling material. The filling material is evenly scraped on the loose polytetrafluoroethylene flat film by a scraper to form a filled polytetrafluoroethylene flat film;

[0048] 3. Coating: Polyethylene glycol (600) diacrylate, acrylic acid, N,N-methylenebisacrylamide, azobisisobutyronitrile, and ethanol according to the weight percentage 1:4:0.02:0.02:30 Mix evenly to obtain the required coating material, and scrape the coating material evenly on the filled polytetrafluoroethylene flat film with a scraper to form a coate...

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Abstract

The invention discloses a preparation method of a hydrophilic polytetrafluoroethylene flat membrane. The method comprises the following steps: relaxing the polytetrafluoroethylene flat membrane; filling the nano particles into the micropores, and then coating the N, N-methylenebisacrylamide and other substances onto the surface of the flat membrane with the nanoparticles; finally, performing a reaction with nitrogen, alkali treatment and other processes in order to obtain the desired hydrophilic polytetrafluoroethylene flat membrane. The polytetrafluoroethylene flat membrane has excellent hydrophilicity, the water filtration speed can reach 1-4 cubic meters / m<2>.hour, the product can be widely used in the sewage filtration industry, and the product has significant economic and social benefits.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene flat film, in particular to a preparation method of a hydrophilic polytetrafluoroethylene flat film. Background technique [0002] The biaxially stretched PTFE flat membrane has structural characteristics of high porosity such as figure 1 , small friction coefficient and smooth surface, it is a high-throughput filter medium. However, the strong hydrophobicity of PTFE flat membrane also limits its application in the treatment of aqueous solution systems. [0003] At present, the hydrophilic modification of polytetrafluoroethylene flat membrane is mainly through irradiation sources including electron beams, plasma, etc., and the irradiation triggers the grafting of hydrophilic monomers, thereby endowing the material with hydrophilic properties. Irradiation such as electron beam has a large depth and has a great influence on the mechanical properties of materials; plasma and other types of irradiation a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D69/06B01D69/02B01D67/00
CPCB01D67/0006B01D69/02B01D69/06B01D71/36B01D2325/36
Inventor 沈景珠
Owner 杭州骥海过滤科技有限公司
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