Reinforced microporous filter membrane and method and device for preparing the same

Abstract

The present invention provides an enhanced millipore filtering film and a method, device for preparing, the enhanced millipore filtering film includes a non-woven fabric as substrate, employing casting wipe way, casting film liquid is applied on the front and the back surfaces of the non-woven fabric, two layer film is formed by gelatin, characterized in that the thickness of the non-woven fabric is 30-120 micron, planar density of the non-woven fabric is 30-100g / m2, thickness of each film layer is 5-10 micron; casting film liquid in two film layer is composed by mixing a polymer resin, an organic solvent and an additive; parts by weight of the polymer resin in the casting film liquid, parts by weight of the organic solvent : parts by weight of the additive is 5-40:40-90: 0.5-50. The enhanced millipore filtering film of the invention is applied in the sampling monitor or filter of alpha radioaerosol under the high radon environment.

Description

technical field

[0001] The invention relates to a filter material, in particular to a reinforced microporous filter membrane for radioactive aerosol sampling and monitoring, and a method and device for preparing the product. Background technique

[0002] The α-radioactive aerosol monitor adopts the energy compensation method to identify the interference of natural daughters (such as Rn and Th daughters) through α-energy spectrum analysis, thereby improving the monitoring sensitivity of radioactive aerosols. However, this method is limited by the structure and performance of the sampling material, especially the aerosol surface collection performance of the sampling filter material. Because whether the α energy spectrum of artificially polluted nuclides can be separated from that of natural daughters depends not only on the resolution of the electronic detection system, but also is closely related to the condition of the enriched sample. If the surface collection properties ...

Examples

Embodiment 1

[0031] Embodiment 1, preparation casting solution

[0032] In this embodiment, four casting solution formulations with different raw material ratios as shown in Table 1 were used to prepare casting solution 4 respectively.

[0033] Table 1: Raw material formula of casting solution (unit: g)

[0034] Formulation ingredient category

Example 1

Example 2

Example 3

Example 4

polymer resin

Polyvinylidene fluoride

50

Polyvinylidene fluoride

120

Polysulfone

350

Polyethersulfone

140

Organic solvents

N, N dimethyl

Formamide 760

N, N dimethyl

Acetamide 760

N, N dimethyl

Acetamide 630

N, N dimethyl

Acetamide 710

Additives

polyethylene glycol

40

polyethylene glycol

90

polyethylene glycol

10

polyethylene glycol

150

Polyethylene

Pyrrolidone 150

Polyethylene

Pyrrolidone 30

Polyethylene

Pyrrolidone 10

[0...

Embodiment 2

[0041] Embodiment 2, using the device of the present invention (as shown in Figure 2) to prepare the enhanced microporous filtration membrane of the present invention

[0042] First, the casting solution 4 prepared in Example 1 is injected into the film solution funnel 3, and then one end of the polyester nonwoven fabric 12 as the base is wound on the driven roller shaft 10, and the other end walks around the guide drum 2A and The guide roller 2B passes through the gap between the film liquid funnel 3 and the two film scraping rollers 5A, 5B in turn, then turns around the steering rollers 8A, 8B and the guide roller 2C, and finally wraps around the drive roller 9 . Then start the driving motor connected to one end of the driving roller shaft 9 to drive the driving roller shaft 9 to rotate, thereby pulling the polyester non-woven fabric 12 to move in the whole system.

[0043] The polyester non-woven fabric 12 continuously passes through the film liquid funnel 3 during operati...

Embodiment 3

[0049] Embodiment 3: Application of the enhanced microporous filtration membrane of the present invention in sampling monitoring and filtration of α-radioactive aerosols in a high radon environment

[0050] The enhanced microporous filter membrane is used to filter aerosols in the air, including natural radon daughter aerosols and artificial radionuclide aerosols, in the monitoring of alpha radioactive aerosols in high radon environments. The aerosol collected by the enhanced microporous filter membrane is used to measure the α particle radioactivity of the aerosol in real time by the α detector located above the filter membrane. Since the filter membrane is characterized by the ability to collect most of the aerosol on the surface of the filter membrane, the energy of the alpha particles emitted by the aerosol on the filter membrane surface will remain basically unchanged (except for a small amount of absorption by the air layer. ). Usually, the energy of α particles emitted...

technical field

[0001] The invention relates to a filter material, in particular to a reinforced microporous filter membrane for radioactive aerosol sampling and monitoring, and a method and device for preparing the product. Background technique

[0002] The α-radioactive aerosol monitor adopts the energy compensation method to identify the interference of natural daughters (such as Rn and Th daughters) through α-energy spectrum analysis, thereby improving the monitoring sensitivity of radioactive aerosols. However, this method is limited by the structure and performance of the sampling material, especially the aerosol surface collection performance of the sampling filter material. Because whether the α energy spectrum of artificially polluted nuclides can be separated from that of natural daughters depends not only on the resolution of the electronic detection system, but also is closely related to the condition of the enriched sample. If the surface collection properties ...

Examples

Embodiment 1

[0031] Embodiment 1, preparation casting solution

[0032] In this embodiment, four casting solution formulations with different raw material ratios as shown in Table 1 were used to prepare casting solution 4 respectively.

[0033] Table 1: Raw material formula of casting solution (unit: g)

[0034] Formulation ingredient category

Example 1

Example 2

Example 3

Example 4

polymer resin

Polyvinylidene fluoride

50

Polyvinylidene fluoride

120

Polysulfone

350

Polyethersulfone

140

Organic solvents

N, N dimethyl

Formamide 760

N, N dimethyl

Acetamide 760

N, N dimethyl

Acetamide 630

N, N dimethyl

Acetamide 710

Additives

polyethylene glycol

40

polyethylene glycol

90

polyethylene glycol

10

polyethylene glycol

150

Polyethylene

Pyrrolidone 150

Polyethylene

Pyrrolidone 30

Polyethylene

Pyrrolidone 10

[0...

Embodiment 2

[0041] Embodiment 2, using the device of the present invention (as shown in Figure 2) to prepare the enhanced microporous filtration membrane of the present invention

[0042] First, the casting solution 4 prepared in Example 1 is injected into the film solution funnel 3, and then one end of the polyester nonwoven fabric 12 as the base is wound on the driven roller shaft 10, and the other end walks around the guide drum 2A and The guide roller 2B passes through the gap between the film liquid funnel 3 and the two film scraping rollers 5A, 5B in turn, then turns around the steering rollers 8A, 8B and the guide roller 2C, and finally wraps around the drive roller 9 . Then start the driving motor connected to one end of the driving roller shaft 9 to drive the driving roller shaft 9 to rotate, thereby pulling the polyester non-woven fabric 12 to move in the whole system.

[0043] The polyester non-woven fabric 12 continuously passes through the film liquid funnel 3 during operati...

Embodiment 3

[0049] Embodiment 3: Application of the enhanced microporous filtration membrane of the present invention in sampling monitoring and filtration of α-radioactive aerosols in a high radon environment

[0050] The enhanced microporous filter membrane is used to filter aerosols in the air, including natural radon daughter aerosols and artificial radionuclide aerosols, in the monitoring of alpha radioactive aerosols in high radon environments. The aerosol collected by the enhanced microporous filter membrane is used to measure the α particle radioactivity of the aerosol in real time by the α detector located above the filter membrane. Since the filter membrane is characterized by the ability to collect most of the aerosol on the surface of the filter membrane, the energy of the alpha particles emitted by the aerosol on the filter membrane surface will remain basically unchanged (except for a small amount of absorption by the air layer. ). Usually, the energy of α particles emitted...

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