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Preparation method of sub-high efficiency polytetrafluoroethylene (PTFE) micro-porous film and film lamination material

A polytetrafluoroethylene and cladding material technology, applied in the field of polytetrafluoroethylene microporous membrane preparation, can solve the problems of reduced membrane strength, large loss of membrane thickness, low resistance, etc. Damage and detachment prevention effect

Active Publication Date: 2012-09-12
浙江净膜环保有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the patent (EP0525630A2) of Daikin Corporation of Japan, a kind of preparation method of stretching semi-sintered polytetrafluoroethylene membrane above the polytetrafluoroethylene melting point is described, and the polytetrafluoroethylene microporous membrane microporous aperture that it obtains is little, The junction area is small and the filtration efficiency is high, but the loss of film thickness is large while the pressure loss is reduced, and the film strength is reduced, which has obvious limitations in practical application
Nitto Denko's patent (US7846238B2) describes a preparation method of a polytetrafluoroethylene microporous membrane with low pressure loss and thick film thickness, which is obtained by longitudinally stretching the unsintered base film above the melting point of polytetrafluoroethylene , and then stretched transversely below the melting point, the obtained polytetrafluoroethylene microporous membrane has large nodes and long microfibers, so the resistance is low and the strength is high, but its pore size is large, the filtration efficiency is also low, and the nodes are distributed in an island shape

Method used

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  • Preparation method of sub-high efficiency polytetrafluoroethylene (PTFE) micro-porous film and film lamination material
  • Preparation method of sub-high efficiency polytetrafluoroethylene (PTFE) micro-porous film and film lamination material
  • Preparation method of sub-high efficiency polytetrafluoroethylene (PTFE) micro-porous film and film lamination material

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preparation example Construction

[0020] The preparation method of the sub-efficient polytetrafluoroethylene microporous membrane and the membrane cladding material comprises the following steps:

[0021] 1) Embryo making by mixing materials: Mix additive oil with a mass ratio of 30% to 40% and polytetrafluoroethylene evenly, place it in a constant temperature oven at 50°C for 16 hours, and pre-press it into a columnar embryo, in which polytetrafluoroethylene Vinyl fluoride is F106 produced by Daikin Company or 601A produced by DuPont Company, its standard relative density is less than 2.16, and the additive oil is ISOPAR-M or ISOPAR-K;

[0022] 2) Baseband molding: put the columnar blank into the extruder, and make a baseband with a width of 20-30cm and a thickness of 100-300μm through extrusion, calendering and drying processes, and the extrusion compression ratio is 30-100;

[0023] 3) Stretching film formation: Stretching film formation in two steps, in which the first step is to gradually increase the tem...

Embodiment 1

[0029] 1) Embryo making by mixing materials: mix the auxiliary oil with a mass ratio of 30% and polytetrafluoroethylene evenly, place it in a constant temperature oven at 50°C for 16 hours, and pre-press it into a columnar embryo, in which polytetrafluoroethylene is The standard relative density of F106 produced by Daikin Company is less than 2.16, and the additive oil is ISOPAR-M;

[0030] 2) Baseband molding: Put the columnar blank into the extruder, and make a baseband with a width of 30 cm and a thickness of 100 μm through extrusion, calendering and drying processes, and the extrusion compression ratio is 30;

[0031] 3) Stretching to form a film: Stretch to form a film in two steps. In the first step, the base belt is gradually stretched longitudinally with a gradient temperature increase. The gradient temperature zone is divided into: the first stretching temperature zone is 80 ° C, the second stretching The temperature zone is 150°C, the third stretching temperature zon...

Embodiment 2

[0034] Embodiment 2 preparation steps are the same as embodiment 1.

[0035]

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Abstract

The invention discloses a preparation method of a sub-high efficiency PTFE micro-porous film and a film lamination material. The preparation method comprises the following steps: 1, uniformly mixing auxiliary oil with PTFE, slaking in a constant temperature baking oven, and pre-pressing to form a cylindrical blank; 2, putting the cylindrical blank in an extruder, and preparing a base band through extruding, calendering and drying; 3, forming a film through two-step stretching, wherein the first step is characterized in that the base band is gradually vertically stretched through gradient heating, and the second step is characterized in that the vertically stretched base band is gradually transversely stretched through gradient heating, and is sintered and fixed to form the PTFE micro-porous film; and 4, laminating the PTFE micro-porous film and a base material through at least one of glue lamination and hot lamination to prepare the film lamination material. The PTFE micro-porous film and the film lamination material prepared in the invention have the excellent performances of low resistance, high interface strength, high tensile strength, high puncture strength and the like, and can be applied to the industrial dust removal field, the clothes field, the dust collector field, the liquid phase filter field, the water processing field and the like.

Description

technical field [0001] The invention belongs to the technical field of preparation of polytetrafluoroethylene (PTFE) microporous membranes, and in particular relates to a preparation method of sub-efficient (EPA) polytetrafluoroethylene microporous membranes and membrane cladding materials. Background technique [0002] Polytetrafluoroethylene (PTFE) has excellent chemical stability and thermal stability, as well as low surface energy and non-polarity, so the PTFE microporous membrane prepared by biaxial stretching is resistant to most chemical solvents and gases, and can withstand Excellent properties such as high temperature, surface non-adhesion, strong hydrophobicity and moisture resistance. On the other hand, because PTFE membrane itself is very soft, it often needs to be used by laminating the substrate. PTFE membrane and membrane composite materials have been widely used as an excellent filter material [0003] PTFE microporous membranes and membrane cladding materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/10B01D67/00
Inventor 计根良蔡海锋卢长安陈亏
Owner 浙江净膜环保有限责任公司
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