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Micro-filtration membrane for filtering PM2.5 particulate matters and preparation method of membrane

A PM2.5 and particulate matter technology, applied in the field of microfiltration membranes for filtering PM2.5 particulate matter and its preparation, can solve the problems of uneven pore size distribution of materials, unsuitable for PM2.5 particulate matter filtration, and excessive pore size, to avoid Inconsistent filtering effect, avoiding uneven pore size distribution and uniform thickness

Inactive Publication Date: 2014-05-14
ANHUI NAWE ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore size distribution of this material is not uniform
Not suitable for filtering PM2.5 particles
In addition, the PTFE porous membrane disclosed in the US patent (U.S. Pat. No. 4,902,423) is not suitable for filtering PM2.5 particles due to its large pore size.

Method used

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  • Micro-filtration membrane for filtering PM2.5 particulate matters and preparation method of membrane
  • Micro-filtration membrane for filtering PM2.5 particulate matters and preparation method of membrane
  • Micro-filtration membrane for filtering PM2.5 particulate matters and preparation method of membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: PTFE powder and sherwood oil are mixed evenly according to the ratio of mass ratio 10:3, and the pasty mixture after mixing is extruded into PTFE base belt through die; Heat PTFE base belt to 250oC and continue 5 minutes, lubricate The agent is released; heat the PTFE base tape to 335oC and keep it for 45 seconds to obtain a continuous semi-sintered film with a sintering degree of 0.4; lower the temperature to 315oC, and stretch the film simultaneously or continuously at a rate of 100% / s, and the transverse stretching ratio is 5 times , the longitudinal stretching ratio is 6 times; the stretched PTFE film is kept at 350oC for 3 minutes for heat setting; finally, the PTFE film and the support layer are subjected to high-temperature hot-compression lamination.

Embodiment 2

[0034] Embodiment 2: PTFE powder and sherwood oil are mixed evenly according to the ratio of mass ratio 10:2, the pasty mixture after mixing is extruded through die and made PTFE base belt; Heating PTFE base belt to 250oC and continued 5 minutes, lubricated The agent is released; heat the PTFE base tape to 330oC and keep it for 50 seconds to obtain a continuous semi-sintered film with a sintering degree of 0.5; lower the temperature to 320oC, and stretch the film simultaneously or continuously at a rate of 100% / s, and the transverse stretching ratio is 1.5 times , the longitudinal stretching ratio is 15 times; the stretched PTFE film is kept at 350oC for 3 minutes for heat setting; finally, the PTFE film and the support layer are subjected to high-temperature hot-compression lamination.

Embodiment 3

[0035] Embodiment 3: PTFE powder and sherwood oil are mixed evenly according to the ratio of mass ratio 10:3.5, and the pasty mixture after mixing is extruded through die to make PTFE base belt; Heat PTFE base belt to 250 ℃ and continue 5 minutes, lubricate The agent is released; heat the PTFE base tape to 340oC and keep it for 40 seconds to obtain a continuous semi-sintered film with a sintering degree of 0.4; cool down to 310oC, and stretch the film simultaneously or continuously at a rate of 100% / s, and the transverse stretching ratio is 3 times , the longitudinal stretching ratio is 10 times; the stretched PTFE film is kept at 350oC for 3 minutes for heat setting; finally, the PTFE film and the support layer are subjected to high-temperature hot-compression lamination.

[0036] The main technical indicators of the prepared membrane are:

[0037] 1. Aperture size:

[0038] By using the bubble point method to measure the maximum pore size of the membrane, the maximum pore s...

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Abstract

The invention discloses a micro-filtration membrane for filtering PM2.5 particulate matters. The micro-filtration membrane comprises a composite layer formed by performing high-temperature hot-pressing on a separation layer and a supporting layer, wherein the separation layer is a PTFE (polytetrafluoroethylene) porous film formed by heating and stretching a PTFE base band and is in a three-dimensional stereoscopic crossed structure; the PTFE base band is formed by mixing fine PTFE powder and a lubricating agent such as petroleum ether into paste and performing extrusion by a die; the supporting layer is made of a polyethylene material and is in a meshed structure. The micro-filtration membrane has the largest pore diameter of 0.3 micron, is uniform in fiber fineness and uniform in thickness and has the porosity within 80-90 percent. According to the measurement, the gas flux can be 18000L / m<2>.min under the differential pressure of 0.1 bar, and the filtering effect is relatively obvious.

Description

technical field [0001] The invention relates to a filter membrane, in particular to a microfiltration membrane for filtering PM2.5 particles and a preparation method thereof. Background technique [0002] Due to the destruction of the environment, the price paid by our economy accounts for 5% to 12% of the gross domestic product. Environmental pollution has become a negative factor hindering China's rise to become a world economic power, and air pollution is an important aspect of environmental pollution. In February 2012, the State Council agreed to release the newly revised "Ambient Air Quality Standards", adding PM2.5 monitoring indicators. [0003] PM2.5 refers to particulate matter with a diameter less than or equal to 2.5 μm in the atmosphere, also known as particulate matter that can enter the lungs. Although the particle size of PM2.5 is small, it has a large specific surface area and is more likely to adsorb toxic substances. Due to its small size, PM2.5 has a st...

Claims

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Application Information

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IPC IPC(8): B01D46/54B01D71/36B01D69/10B01D67/00B32B27/30B32B7/08
Inventor 胡涛
Owner ANHUI NAWE ENVIRONMENTAL PROTECTION TECH
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