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Polytetrafluoroethylene membrane-based filtering material, and preparation method and application thereof

A technology of polytetrafluoroethylene membrane and filter material, applied in the field of materials, can solve the problems of ineffectiveness, loss of function, and decline of electrostatic effect, achieve excellent particle filtration effect, and overcome the effect of continuous reduction of filtration efficiency over time.

Inactive Publication Date: 2017-11-24
谢 东明 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of these materials is that they rely on the electrostatic adsorption of particles at the root of the fiber, which will lose their effect when the humidity of the use environment is high. After a certain period of use (generally not longer than three months), the electrostatic effect will gradually decline until it does not work.

Method used

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  • Polytetrafluoroethylene membrane-based filtering material, and preparation method and application thereof
  • Polytetrafluoroethylene membrane-based filtering material, and preparation method and application thereof
  • Polytetrafluoroethylene membrane-based filtering material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Example 1 proposes a filter material based on polytetrafluoroethylene membrane, and its preparation method includes the following steps:

[0019] (1) Heat and melt the hot melt adhesive to 75°C.

[0020] (2) Use the product obtained in the step (1) to bond a polyester needle punched material with a thickness of 3.5 cm and a polytetrafluoroethylene membrane with a pore size of 0.1 μm.

[0021] (3) The product obtained in the step (2) is cured at room temperature for 50 hours to obtain a filter material based on a polytetrafluoroethylene membrane.

Embodiment 2

[0023] Example 2 proposes a filter material based on polytetrafluoroethylene membrane, and its preparation method includes the following steps:

[0024] (1) Heat and melt the hot melt adhesive to 95°C.

[0025] (2) Use the product obtained in the step (1) to bond a polyester needle punched material with a thickness of 3.0 cm and a polytetrafluoroethylene membrane with a pore size of 0.3 μm.

[0026] (3) The product obtained in the step (2) is cured at room temperature for 45 hours to obtain a filter material based on a polytetrafluoroethylene membrane.

Embodiment 3

[0028] Example 3 proposes a filter material based on polytetrafluoroethylene membrane, and its preparation method includes the following steps:

[0029] (1) Heat and melt the hot melt adhesive to 85°C.

[0030] (2) Use the product obtained in the step (1) to bond a polyester needle punched material with a thickness of 3.2 cm and a polytetrafluoroethylene membrane with a pore size of 0.2 μm.

[0031] (3) The product obtained in the step (2) is cured at room temperature for 48 hours to obtain a filter material based on a polytetrafluoroethylene membrane.

[0032] Such as Figure 1-Figure 3 As shown, the main core component of the high-efficiency filter element of the existing fresh air system is HEPA (ie, high-efficiency filter) material, commonly known as electrostatic cotton, and its function of filtering particles is mainly achieved by electrostatic adsorption of fiber roots. Generally, the function of adsorbing particles will basically fail if the time is more than 3 days or under ...

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Abstract

The invention relates to a polytetrafluoroethylene membrane-based filtering material, and a preparation method and an application thereof. The method comprises the following steps: heating a hot melt adhesive to 75-95 DEG C to melt the hot melt adhesive; bonding a terylene needle-punched material with a polytetrafluoroethylene membrane by using the molten hot melt adhesive; and curing the bonded product at room temperature to obtain the polytetrafluoroethylene membrane-based filtering material. The polytetrafluoroethylene membrane-based filtering material adopts polytetrafluoroethylene as a raw material, the surface of the polytetrafluoroethylene membrane is full of fibril-shaped micro-pores, so the polytetrafluoroethylene membrane-based filtering material has an excellent micro-particle filtering effect, and can be widely applied to the fields of pharmacy, biochemistry, microelectronics and laboratory consumables. The defect of regular replacement of an HEPA filtering material used in existing fresh air systems, caused by the continuous reduction of the filtering efficiency with time, is overcome in the invention.

Description

Technical field [0001] The invention belongs to the technical field of materials, and specifically relates to a filter material based on a polytetrafluoroethylene membrane, and a preparation method and application thereof. Background technique [0002] The existing high-efficiency filter materials commonly used in fresh air systems are made of HEPA materials (ie, high-efficiency air filters). The most common materials are PP filter paper, composite PET filter paper, meltblown polyester non-woven fabric and meltblown glass fiber. The main disadvantage of these materials is that they rely on static electricity at the roots of the fibers to adsorb particulates, which will lose their effect when the environment is relatively humid. After a certain period of use (generally no longer than three months), the electrostatic effect gradually declines until it does not work. Summary of the invention [0003] An object of the present invention is to provide a method for preparing a filter ma...

Claims

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Application Information

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IPC IPC(8): B01D71/36B01D69/02B01D46/54
CPCB01D71/36B01D46/543B01D69/02B01D2325/02B01D2325/22B01D2325/30
Inventor 谢东明
Owner 谢 东明