Polyfluortetraethylene nanofibre membrane and preparation method thereof

A technology of polytetrafluoroethylene and nanofiber membranes, applied in chemical instruments and methods, membrane technology, flat products, etc., can solve the problems that do not involve the key parameters and indicators of the degree of nanofibrillation of membrane materials, and achieve a high degree of fibrosis, Stretch evenly and heat evenly

Inactive Publication Date: 2010-12-22
北京千叶宝莲科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although some performance indicators have been improved, the above-mentioned patents do not involve the key parameter indicators of the degree of nanofibrillation of the film material and the concentration of the pore size distribution of the material, and cannot fundamentally solve the defects of this type of product

Method used

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  • Polyfluortetraethylene nanofibre membrane and preparation method thereof
  • Polyfluortetraethylene nanofibre membrane and preparation method thereof
  • Polyfluortetraethylene nanofibre membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] In this embodiment, the polytetrafluoroethylene raw material is a commercially available ultra-high molecular weight polytetrafluoroethylene (molecular weight: 9,000,000) dispersion resin, and the lubricant is a mixture of liquid paraffin and aviation kerosene. Operate as follows.

[0025] (1) Ingredients: equilibrate the raw materials to be prepared for 85 hours at an ambient temperature of 18° C. and a relative humidity of 78%. Thereafter, 100 parts of ultra-high molecular weight polytetrafluoroethylene (molecular weight 9,000,000) dispersion resin was put into a container with a stirrer, and 30.5 parts of mixed lubricant was added to the dispersion resin while stirring.

[0026] (2) Ripening: the temperature of the stirring tank is raised to 42°C, the stirring is continued for 1 hour, and the temperature is raised to 43°C for 8 hours;

[0027] (3) Billet making: the pressure of the billet pushing machine is 21kg / cm 2 , the vehicle speed is 110mm / min;

[0028] (4) ...

Embodiment 2

[0035] ① Ingredients: Mix polytetrafluoroethylene dispersion resin with a molecular weight of 7,000,000 and lubricant at an ambient temperature of 21°C and a relative humidity of 60% for 72 hours, and stir and mix in parts by weight of 1:0.315;

[0036] ②Aging: heat up the stirring tank to 45°C, continue to stir for 1 hour, cool down to 34°C and stand still for more than 15 hours;

[0037] ③ Billet making: the pressure of the billet pushing machine is 23kg / cm 2 , speed 115mm / min;

[0038] ④ Extrusion: the temperatures of the first, second, third and fourth zones of the extrusion machine sleeve are 46°C, 57°C, 61°C, and 52°C respectively;

[0039] ⑤ Calendering: adjust the temperature and pressure to keep the base tape 320mm wide and 180 microns thick;

[0040] ⑥ Two-step longitudinal stretching: the first longitudinal stretching temperature is 88°C, the stretching ratio is 1.18 times, the second longitudinal stretching temperature is 96°C, and the stretching ratio is 3.8 tim...

Embodiment 3

[0045] ① Ingredients: PTFE dispersion resin with a molecular weight of 8,000,000 and a lubricant are balanced for 67 hours at an ambient temperature of 19°C and a relative humidity of 80%, and stirred and mixed in parts by weight of 1:0.3;

[0046] ②Aging: heat up the stirring tank to 36°C, continue to stir for 1 hour, cool down to 38°C and stand still for more than 12 hours;

[0047] ③ Billet making: the pressure of the billet pushing machine is 25kg / cm 2 , speed 120mm / min;

[0048] ④ Extrusion: the temperatures of the first, second, third and fourth zones of the extrusion machine sleeve are 43°C, 53°C, 58°C, and 48°C respectively;

[0049] ⑤ Calendering: adjust the temperature and pressure to keep the base tape 320mm wide and 100 microns thick;

[0050] ⑥ Two-step stretching: the first step of longitudinal stretching temperature is 78°C, the stretch ratio is 1.3 times, the second step of longitudinal stretching temperature is 80°C, and the stretch ratio is 5.6 times;

[005...

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Abstract

The invention relates to a polyfluortetraethylene nanofibre membrane and a preparation method thereof. The aperture distribution of the polyfluortetraethylene nanofibre membrane is concentrated within a range of + / -100 nanometers and occupies more than 90 percent of the total volume of each level aperture; the stretching process of the preparation method adopts low-temperature segmenting stretching, thus the stretching temperature is stable, the polyfluortetraethylene nanofibre membrane is uniformly heated, and giant molecule segmers are equally unfolded; the produced polyfluortetraethylene nanofibre membrane has concentrated aperture distribution and high uniformity so as to generate high water pressure resistance, long water resistant time and high membrane fibering degree, and the obstructing efficiency of bacteria reaches more than 99.99 percent, thereby the polyfluortetraethylene nanofibre membrane can meet the requirement of oil-water separation and high-end gas filtration of anoperation isolation mattress with high-pressure steam filtration and high water pressure resistance and can be used in fields of superclean room entering air filtration, and the like, such as medicaltreatment and health protection, health matter cultivation, semiconductor devices, integrated circuit, medicine, and the like.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene film, in particular to a polytetrafluoroethylene nanofiber film and a preparation method of the product. Background technique [0002] PTFE microporous film can be widely used in medical and biochemical protection, high-pressure steam filtration, electronics, biology, environmental protection and ultra-clean dust removal because of its good waterproof and moisture-permeable, bacteria-blocking, and filtering functions. In addition, military and police uniforms, mountaineering and skiing, aerospace and other outdoor clothing, shoes and hats are also products that make full use of the waterproof and moisture-permeable function of PTFE microporous films. The removal efficiency of microparticles is proportional to the minus two-thirds of the filter fiber diameter, so the smaller the fiber diameter, the higher the filtration efficiency and the stronger the waterproof and moisture-permeable function. The por...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/36B01D67/00B29D7/01B29C55/00
Inventor 任正善张维兰
Owner 北京千叶宝莲科技有限公司
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