Laminated sintering composite polytetrafluoroethylene micropore hydrophobic membrane

A polytetrafluoroethylene, hydrophobic membrane technology, applied in membrane, membrane technology, semi-permeable membrane separation and other directions, can solve the problem of service life discount, affecting industrialization promotion and so on

Inactive Publication Date: 2018-12-28
刘宁生
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The average porosity of more than this thickness drops to 30%, which directly affects the flux of gas, inevitably swells and becomes hydrophilic, and the service life is greatly reduced, which directly affects the promotion of industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The laminated and sintered composite polytetrafluoroethylene microporous hydrophobic membrane of this embodiment is made through the following steps:

[0019] Step (1): Compositing the semi-sintered expanded biaxially stretched polytetrafluoroethylene microporous horizontal film through a winding device to form a film roll;

[0020] Step (2): Continuously sintering the film roll prepared in step (1) in a multi-stage calcining equipment;

[0021] Step (3): The sintered and formed membrane roll enters the rolling lamination equipment, and the microporous substrate is thermally laminated on the polytetrafluoroethylene microporous hydrophobic membrane to form a laminated and sintered composite polytetrafluoroethylene microporous hydrophobic membrane.

[0022] The expanded biaxially stretched polytetrafluoroethylene microporous horizontal film is a conventional single-layer film, and the average porosity is generally 80% and the thickness is below 30um. The average porosity...

Embodiment 2

[0032] The laminated and sintered composite polytetrafluoroethylene microporous hydrophobic membrane of this embodiment is made through the following steps:

[0033] Step (1): 7 layers of 10um thick, semi-sintered expanded biaxially stretched polytetrafluoroethylene microporous horizontal film with a pore size of 0.3um are composited into a 70um thick film at 22°C through a flexible scraping and cold-pressing winding device roll.

[0034] Step (2): Continuously sinter the 70um-thick film roll cold-pressed at 22°C for 2 minutes in a multi-stage calendering equipment with a pressure of 10 kg at 330°C.

[0035] Step (3): The sintered and formed film roll is cooled to 130°C by natural cooling at the outlet of the calendering equipment and enters the rolling lamination equipment, and the microporous 30um thick PET non-woven substrate is thermally laminated on the polytetrafluoroethylene microporous A laminated and sintered composite polytetrafluoroethylene microporous hydrophobic ...

Embodiment 3

[0038] The laminated and sintered composite polytetrafluoroethylene microporous hydrophobic membrane of this embodiment is made through the following steps:

[0039] Step (1): 12 layers of 10um thick, semi-sintered expanded biaxially stretched polytetrafluoroethylene microporous horizontal film with a pore size of 0.3um are composited into a 120um thick film at 26°C through a flexible scraping and cold-pressing winding device roll.

[0040] Step (2): Continuously sinter the 120um-thick film roll cold-pressed at 26°C for 2 minutes in a multi-stage calendering equipment at 350°C and a pressure of 30 kg.

[0041] Step (3): The sintered film roll is cooled to 150°C by natural cooling at the outlet of the calendering equipment and enters the rolling lamination equipment, and the microporous 30um thick PET non-woven substrate is thermally laminated on the polytetrafluoroethylene microporous A laminated and sintered composite polytetrafluoroethylene microporous hydrophobic membrane ...

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Abstract

The invention relates to a laminated sintering composite polytetrafluoroethylene micropore hydrophobic membrane which is prepared in the following steps: (I), coiling a semi-sintered puffed bidirectional tensioned polytetrafluoroethylene micropore hydrophobic membrane into a membrane coil by using coiling equipment; (II) continuously sintering the membrane coil made in the step (I) in multi-section lamination sintering equipment; (III) feeding the sintered and molded membrane coil into rolling membrane compositing equipment, and carrying out hot compositing on a micropore substrate on the polytetrafluoroethylene micropore hydrophobic membrane, thereby obtaining the laminated sintering composite polytetrafluoroethylene micropore hydrophobic membrane. The laminated sintering composite polytetrafluoroethylene micropore hydrophobic membrane provided by the invention has excellent properties of swelling resistance, super-hydrophobicity, strong acid resistance and strong alkali resistance, and is applicable to fields such as chemical engineering, energy engineering, medicines, electronics and spaceflight.

Description

technical field [0001] The invention relates to the field of polytetrafluoroethylene microporous membranes, in particular to a laminated and sintered composite polytetrafluoroethylene microporous hydrophobic membrane. Background technique [0002] Energy saving and emission reduction has become a major national policy of my country's industrial development. However, the annual consumption of the acid industry in my country is astonishingly large, and the waste acid solution to be discharged is nearly one million cubic meters. However, the waste acid solution in many industries contains a considerable amount of valuable metals, especially in the production process of forming aluminum sheets. The inorganic waste acid is also rich in a certain amount of high-purity aluminum. Over the years, most of the inorganic waste acid has been treated by simple neutralization method, which not only pollutes the environment, but also wastes precious resources. For this reason, the resource ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/12B01D69/02
CPCB01D69/02B01D69/12B01D71/36B01D2325/38
Inventor 刘宁生
Owner 刘宁生
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