Nylon film, and preparation method and application thereof

A technology of nylon membrane and nylon, which is applied in the field of filter membrane to achieve good adsorption effect

Active Publication Date: 2020-09-01
HANGZHOU COBETTER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional nylon membrane only has one level of barrier for fluid filtration, and cannot further filter the impurity particles with a smaller particle size in the fluid.

Method used

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  • Nylon film, and preparation method and application thereof
  • Nylon film, and preparation method and application thereof
  • Nylon film, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0102] In the present invention, also provide a kind of preparation method of nylon film, method comprises steps:

[0103] S1: preparing a nylon casting solution and providing a carrier. The nylon casting solution includes nylon and a polar solvent, wherein the mass content of nylon is 10%-25%, and the polar solvent is formic acid. Here, the polar solvent can also be selected from any one or combination of hydrochloric acid, sulfuric acid, phosphoric acid, and trifluoroacetic acid. And at the same time limit the viscosity of the nylon casting solution below 50000cP. If the viscosity of the nylon casting solution is too high, the casting solution is very thick and has poor fluidity, and cannot carry out phase separation; if the viscosity of the nylon casting solution is too low, then in the subsequent S2 step, the nylon casting solution is difficult to Keep it on the surface of the support layer. When the coating film is phase-separated, the nylon casting solution on the surfa...

Embodiment 1

[0109] Configure the casting solution, uniformly mix 10% nylon content, 80% formic acid, and 10% methanol; spray the casting solution on both sides of the non-woven support layer through the nozzle; form a coating film, and then apply the The coating film is placed in an environment with an absolute humidity of 5gH2O / kg and a temperature of 40°C for phase separation for 120 seconds to form a semi-wet film. At the same time, the semi-wet film is blown at an angle of 0° and a wind speed of 0.2m / s, after the phase separation is completed to form a semi-wet film, immerse it in a water bath for treatment, take it out and dry it after 30s, and form a finished nylon film.

[0110] After measuring the finished nylon membrane, the ratio of the average pore size of the filter pores to the average particle size of the nylon particles is 3, the specific surface area is 16㎡ / g, the maximum particle size is 14.2μm, the maximum pore size is 5μm, and the porosity is 42%. The initial water bub...

Embodiment 2

[0112] Configure the casting solution, uniformly mix the nylon content of 12%, 83% formic acid, and 5% methanol; spray the casting solution on both sides of the non-woven support layer through the nozzle; form a coating film, and then apply the The coating film is placed in an environment with an absolute humidity of 7gH2O / kg and a temperature of 37°C for phase separation for 110 seconds to form a semi-wet film. At the same time, the semi-wet film is blown at an angle of 5° and a wind speed of 1m / s, after the phase separation is completed to form a semi-wet film, immerse it in a water bath for treatment, take it out and dry it after 40s, and form a finished nylon film.

[0113] After measuring the finished nylon membrane, the ratio of the average pore size of the filter pores to the average particle size of the nylon particles is 4, the specific surface area is 20㎡ / g, the maximum particle size is 11.5μm, the maximum pore size is 6.9μm, and the porosity is 45%. , the initial w...

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Abstract

The invention relates to a nylon film. The nylon film comprises a nylon layer, the nylon layer comprises a solid part, the solid part comprises a plurality of granular nylon particles, every two adjacent blocky nylon particles are connected through a bonding section to form a plurality of nylon particle chains, and the bonding width of each bonding section is not larger than one half of the particle size of the blocky nylon particles at the two bonding ends; and the nylon particles on the nylon particle chains can be connected to a plurality of other nylon particles through the bonding sections, the filtering holes are defined by the nylon particle chains, and a net-shaped structure is formed between the nylon particle chains in the whole space of the nylon layer. The invention aims to provide the nylon film with primary barrier filtration and secondary adsorption filtration functions, and the preparation method and application thereof.

Description

technical field [0001] The invention relates to a filter membrane, especially a nylon membrane and its preparation method and application. Background technique [0002] Nylon membrane is a commonly used microporous filtration membrane, and its material is nylon, so it is also called polyamide microporous filtration membrane. It has good hydrophilicity and is resistant to acids and bases of appropriate concentration. It can not only be used in aqueous solutions containing acids and bases, but also suitable for use in organic solvents, such as alcohols, hydrocarbons, ethers, esters, and ketones. , Benzene and benzene homologues, dimethylformamide, dimethyl sulfoxide, etc., are one of the most widely used microporous membranes. [0003] For the traditional nylon membrane, its surface and interior are hollow filter holes. The hollow filter holes are used to block the impurities with too large particle size on one side of the nylon membrane, and filter the liquid by intercepting...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/56B01D69/10B01D69/02B01D67/00B01D61/14A61M5/165
CPCB01D71/56B01D69/10B01D69/02B01D67/0013B01D61/147A61M5/165A61M2005/1657
Inventor 贾建东卢红星
Owner HANGZHOU COBETTER TECH CO LTD
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