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Low-resistance wear-resistance teflon microporous membrane and preparation method

A technology of polytetrafluoroethylene and microporous membrane, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as increased operating power, increased operating cost, and damage, and achieves high wear resistance puncture The effect of increasing strength, widening the field of use, and reducing operating costs

Active Publication Date: 2014-09-17
浙江净膜环保有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, PTFE microporous membrane products sacrificed the strength of the material in order to obtain lower resistance, which not only affected the service life of the membrane, but also reduced the filtration performance of the membrane during the coating process and component molding process, and even damaged
Therefore, in order to ensure sufficient strength for subsequent processing and application, the resistance of the PTFE microporous membrane will be limited to a certain extent, and the increase in resistance will increase the operating power and energy consumption of the component, which will lead to the operation of the component. Increased costs

Method used

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  • Low-resistance wear-resistance teflon microporous membrane and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Daikin F106 polytetrafluoroethylene resin and Mobil ISOPAR M additive oil were uniformly mixed to form a mixed powder, and the mass percentage of additive oil was 20%. Then place it in a constant temperature oven at 50°C for more than 24 hours to ensure the full absorption of the additive oil. Pour the mixed powder into the pre-pressing cylinder and press it into a cylindrical billet, then put the pre-pressed billet into the extruder, and the extruded billet is calendered to obtain a PTFE-based tape with a film thickness of 200 μm . The base tape obtained by calendering is passed through a dryer to remove auxiliary oil. The dry base tape is placed in a longitudinal stretching device for longitudinal stretching, the longitudinal stretching temperature is 250°C, the longitudinal stretching speed is 200% / s, and the longitudinal stretching ratio is 5 times. The longitudinally stretched base belt is placed in a relaxation device for relaxation treatment, the relaxati...

Embodiment 2

[0039] Daikin F106 polytetrafluoroethylene resin and Mobil ISOPAR M additive oil were uniformly mixed to form a mixed powder, and the mass percentage of additive oil was 20%. Then place it in a constant temperature oven at 50°C for more than 24 hours to ensure the full absorption of the additive oil. Pour the mixed powder into the pre-pressing cylinder and press it into a cylindrical billet, then put the pre-pressed billet into the extruder, and the extruded billet is calendered to obtain a PTFE-based tape with a film thickness of 200 μm . The base tape obtained by calendering is passed through a dryer to remove auxiliary oil. The dry base tape is placed in a longitudinal stretching device for longitudinal stretching, the longitudinal stretching temperature is 200°C, the longitudinal stretching speed is 100% / s, and the longitudinal stretching ratio is 4 times. The longitudinally stretched base belt is placed in a relaxation device for relaxation treatment, the relaxati...

Embodiment 3

[0041] Daikin F106 polytetrafluoroethylene resin and Mobil ISOPAR M additive oil were uniformly mixed to form a mixed powder, and the mass percentage of additive oil was 20%. Then place it in a constant temperature oven at 50°C for more than 24 hours to ensure the full absorption of the additive oil. Pour the mixed powder into the pre-pressing cylinder and press it into a cylindrical billet, then put the pre-pressed billet into the extruder, and the extruded billet is calendered to obtain a PTFE-based tape with a film thickness of 200 μm . The base tape obtained by calendering is passed through a dryer to remove auxiliary oil. The dry base tape is placed in a longitudinal stretching device for longitudinal stretching, the longitudinal stretching temperature is 250°C, the longitudinal stretching speed is 300% / s, and the longitudinal stretching ratio is 10 times. The longitudinally stretched base belt is placed in a relaxation device for relaxation treatment, the relaxation te...

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Abstract

The invention discloses a low-resistance wear-resistance teflon microporous membrane and its preparation method. The teflon microporous membrane has a unique microstructure which is composed of banded nodes which are parallelly arranged and fine fiber used for connecting the nodes. The method comprises the following steps: 1) uniformly mixing teflon resin and an auxiliary agent oil, curing in a constant temperature oven, prepressing, extruding and calendering to prepare a base band; 2) drying and degreasing the above base band, and stretching in the direction parallel to the length of the base band; 3) carrying out loosing processing on the above longitudinally-stretched membrane in a heat-treatment oven at a certain loosing ratio; and 4) stretching the above sintered membrane at the temperature higher than melting point of teflon in the direction perpendicular to the length of the base band and sintering and shaping. The prepared PTFE microporous membrane material has excellent properties such as low resistance, good abrasion resistance, high puncture strength and the like, and can be applied in multiple fields of industrial dedusting, clothing, dust collectors, liquid-phase filtering, water treatment and the like.

Description

technical field [0001] The invention belongs to the technical field of polytetrafluoroethylene (PTFE) microporous membrane preparation, in particular to a low-resistance and wear-resistant polytetrafluoroethylene microporous membrane and a preparation method thereof. Background technique [0002] Polytetrafluoroethylene (PTFE) has the reputation of "King of Plastics". It has excellent chemical stability and thermal stability, as well as low surface energy and non-polarity. Therefore, the PTFE microporous membrane prepared by biaxial stretching has excellent resistance Most of the chemical solvents and gases, high temperature resistance, surface non-adhesion, strong hydrophobicity and moisture resistance and other excellent properties, PTFE membrane has been widely used as an excellent filter material. [0003] The resistance and strength of PTFE microporous membrane are important parameters to evaluate the performance of the film, and are the key factors affecting the applic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/02B01D67/00
Inventor 蔡海锋计根良王平张丕运卢长安白静娜
Owner 浙江净膜环保有限责任公司
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