Polytetrafluoroethylene composite micro porous film for air purifying and its producing method

A technology of polytetrafluoroethylene and air purification, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems such as the decrease of filtration efficiency and air flow resistance, and achieve low production cost, reliable performance and excellent manufacturing process simple effect

Active Publication Date: 2006-08-23
TONGXIANG JIANMIN FILTER MATERIALS
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

The existing technology of polytetrafluoroethylene microporous membranes for air purification is to compound polytetrafluoroethylene microporous membranes on the surface of materials such as polypropylene, polyester, and glass fibers in different ways. Increase the thickness of the PTFE microporous membrane to compensate for the decrease in efficiency caused by the damage of the membrane during use, so that the guarantee of filtration efficiency and the decrease of air flow resistance become a pair of contradictions

Method used

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  • Polytetrafluoroethylene composite micro porous film for air purifying and its producing method
  • Polytetrafluoroethylene composite micro porous film for air purifying and its producing method

Examples

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Effect test

Embodiment 1

[0024] Polypropylene short fibers with a melting point of 125°C and polyester medium-long fibers are made into a non-woven fabric 1 by hydroentanglement in a ratio of 1:9, and then hot-rolled, one of which is 15g / m 2 , the other one is 75g / m 2 , as a polytetrafluoroethylene microporous membrane 2 to protect the supporting material up and down. Select polytetrafluoroethylene microporous membrane 2 with a pore size of 1.2um, a porosity ≥ 88%, and a thickness of 6um as the material for ensuring efficiency, three layers of thermal lamination, the thermal lamination temperature is controlled at 114-117°C, and the line pressure is 0.45MPa The speed is 1.5m / min, and the thickness of the prepared film is 0.28-0.30mm. The structure is as follows figure 1 .

[0025] According to the conventional membrane performance evaluation method, the membrane has a filtration efficiency of 99.995% for 0.3-0.4um DOP at an air velocity of 5.3cm / sec, and a pressure drop of 142Pa, meeting the efficie...

Embodiment 2

[0027] Nonwovens 1 were manufactured as described in Example 1, two of which were 15 g / m 2 , the other one is 75g / m 2 , as a polytetrafluoroethylene microporous membrane 2 to protect the supporting material up and down. Select polytetrafluoroethylene microporous membrane 2 with a pore diameter of 1.2um, a porosity ≥ 88%, and a thickness of 5um and place it in two kinds of 15g / m. In the middle of the non-woven fabric 1, select a polytetrafluoroethylene microporous membrane 2 with a pore size of 0.7um, a porosity ≥ 88%, and a thickness of 5um and place it at a density of 15g / m 2 and 75g / m 2 In the middle of non-woven fabric 1, five layers of thermal lamination, the thermal lamination temperature is 15g / m 2 . One side of the non-woven fabric is controlled at 114~117°C, at 75g / m 2 One side of the non-woven fabric is controlled at 116-118°C, the linear pressure is 0.45MPa, and the composite speed is 1.0m / min. The thickness of the prepared film is 0.35-0.38mm. The structure is ...

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Abstract

The present invention discloses composite microporous polytetrafluoroethylene film for air purification and its production process. The composite microporous polytetrafluoroethylene film is one kind of capillary microporous film comprising microporous polytetrafluoroethylene film to ensure the filtering efficiency and its composited protecting and supporting material. The protecting and supporting material is polymer or inorganic fiber material. The microporous polytetrafluoroethylene film has thickness of 3-20 microns and pore size of 0.050-10.0 microns, the protecting and supporting material has the thickness of 10-3000 microns. The present invention has the features of low cost, easy manufacture and simple technological process, etc.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene composite microporous membrane for air purification and a preparation method thereof. Background technique [0002] Air purification is of great significance in high-tech fields such as biology, pharmacy, chemical industry, electronics, environmental protection, and scientific experiments. Traditional filter media include polypropylene, polyester, and glass fiber, which are manufactured by spunbonding, melt blown, hot pressing, or papermaking. The obtained product is a deep filter medium. During the use of air filtration, the filter Efficiency varies with air flow velocity and with the potential for filter retentate breakthrough. [0003] Polytetrafluoroethylene microporous membrane is a surface filter medium made of two-way stretching method, and the membrane pores are in the shape of a network. Because of its sharp screening and filtration characteristics, it has been widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/36B01D69/10
Inventor 顾玉琴尤健民杨树学
Owner TONGXIANG JIANMIN FILTER MATERIALS
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