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Composite membrane with high interfacial strength and air permeability

A technology of interface strength and composite membrane, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problems of short service life, easy separation, low air flow, etc. The effect of high strength and simple process

Active Publication Date: 2019-06-28
ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult for the PTFE composite membrane prepared by the existing hot-melt bonding composite technology to tightly bond the support layer (bonding film) and the PTFE layer, so that the prepared composite membrane has low peel strength and is easy to separate. The service life is short. In addition, the low air flow of the PTFE composite membrane prepared by the hot melt bonding method limits the application range of the composite membrane.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A composite film with high interfacial strength and air permeability, which is obtained by laminating the polytetrafluoroethylene bubble point film and the laminating film, and rolling it with a single-side hot roller at a temperature of 280°C and a traveling speed of 15m / min. The composite membrane has an air permeability of 0.12L / cm when the test pressure difference is 10kPa 2 min, the interface strength is 6N, the bonding film is made of PVC material, the intrinsic viscosity is 1.2dL / g, the mass ratio of PTFE bubble-point film to PVC material is 30:1, and the PTFE bubble-point film The pore diameter is 5 μm, the thickness is 2000 μm, and the thickness of the laminated film is 100 μm.

Embodiment 2

[0022] A composite film with high interfacial strength and air permeability, which is obtained by laminating a polytetrafluoroethylene film and a laminated film at a temperature of 150 ° C and a single-side hot roller with a speed of 10 m / min. The air permeability of the composite membrane is 2L / cm when the test pressure difference is 10kPa 2 Min, the interface strength is 2.5N, the bonding film is made of PPT material, the intrinsic viscosity is 1dL / g, the mass ratio of the polytetrafluoroethylene film and the PPT material is 20:1, and the pore size of the polytetrafluoroethylene film is 3 μm , the thickness is 500 μm, and the thickness of the laminated film is 80 μm.

Embodiment 3

[0024] A composite film with high interfacial strength and air permeability is obtained by laminating a polytetrafluoroethylene film and a laminated film at a temperature of 80 ° C and a single-side hot roller with a speed of 5 m / min. The air permeability of the composite membrane is 2.5L / cm when the test pressure difference is 10kPa 2 min, the interface strength is 2.8N, the bonding film is made of PE material, the intrinsic viscosity is 0.5dL / g, the mass ratio of PTFE film and PE material is 10:1, and the pore size of PTFE film is 0.1 μm, the thickness is 100 μm, and the thickness of the laminated film is 5 μm.

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PUM

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Abstract

The invention relates to the fields of composite membranes and preparation of the composite membranes and particularly relates to a composite membrane with high interfacial strength and air permeability. The composite membrane comprises a polytetrafluoroethylene membrane and a fitting membrane arranged on the polytetrafluoroethylene membrane, wherein the compositing temperature between the fittingmembrane and the polytetrafluoroethylene membrane is 80-280 DEG C, and the fitting membrane is prepared from a thermoplastic high molecular material; and the intrinsic viscosity of the thermoplastichigh molecular material is 0.5dL / g-1.2dL / g. The prepared composite membrane is high in interfacial strength and air permeability, so that the service life of the membrane is greatly prolonged.

Description

technical field [0001] The invention relates to the field of composite membrane and its preparation, in particular to a composite membrane with high interface strength and air permeability. Background technique [0002] Polytetrafluoroethylene composite membrane is an asymmetric separation membrane. The general preparation method is to prepare a porous support membrane first, and then form a very thin layer of dense skin on its surface. Usually, the two layers of materials are different polymers. The manufacturing technology of the composite membrane refers to the method of how the cortex is composited to the surface of the supporting membrane, mainly including interfacial polymerization, monomer catalytic polymerization, solution casting, solution dipping or spraying, in addition to plasma polymerization, water surface development method, etc. Due to the harsh preparation conditions of the above method, it is difficult to prepare on a large scale. At present, the hot-melt ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/32B32B27/30B32B27/08B32B27/06B32B27/40B32B3/24
Inventor 姜学梁王峰
Owner ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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