SU852896A1 - Method of producing porous filtering material - Google Patents

Description

It is kept in acetone for 5 minutes, dried in air and treated with a 0.5% solution of vinyltrichlorosilane in n-propyl alcohol for 5 minutes, kept in air for 10 minutes and heat-treated at 145 ° C for 4 minutes.

After heat treatment, the film is soaked with acetone and removed from the glass.

The resulting film filter material has a uniform structure ,. The average pore diameter is 0.3 µm, the productivity of ethyl alcohol is 150 ml / min-cm, water is 65 ml / min-cm with a pressure drop of 1 kg / cm, and the porosity is 69.5 vol. %

Example 2. Prepare a solution containing 19 weight. % polyamide (brand A6-1IO), 68,7 weight. % formic acid, 12.3 weight. % water. With the help of a slit die, the solution is applied onto a polished glass plate, kept on

air at 22 ° C for 10 s. Coagulation is carried out in a solution containing 35 wt. % ethanol and 65 in -EU. % deionized water. Then, the formed membrane is washed in deionized water, kept in acetone, dried in air at 22 ° C and treated with a 0.3% solution of methylcarboxylate complex of chromium for 5 minutes and

heat treated at 150 ° C in air.

After heat treatment, the film is soaked in acetone and removed from the glass.

The resulting film filter

the material has a porous structure, an average pore diameter of 0.04 µm, a performance of ethyl alcohol 0.5 ml / min-cm, water 0.35 ml / min-cm with a pressure drop of 1 kg / cm, a porosity of 65 vol. %

The properties of the membranes depending on the parameters of the proposed method are presented in the table.

Using the proposed method allows to obtain a polyamide filter material with predetermined pore sizes, with high chemical resistance and mechanical strength, with high filtration efficiency from solid and gel-like particles.

The advantage of the proposed method in comparison with the prototype is the high stability of the filtering material due to the presence in the filtering material of a surfactant which provides high chemical and mechanical strength, high filtration efficiency from mechanical and especially from gel-like particles.

The filtration efficiency of photoresistors from mechanical and gel-like particles through the filtering material obtained by the proposed method is 4-5 times higher than through the filtering material obtained by the prototype method. The material obtained by the proposed method is suitable for work in alcohol-containing environments, while

the material obtained by the method of the prototype, unsuitable for use in alcohol-containing environments.

Polyamide film filter material obtained according to the proposed

This method can be widely used for cleaning photoresists, solvents, biological solutions, drugs, and food products.

Claims (1)

Invention Formula A method of obtaining a porous filter material from a polyamide solution by coating a ataged adhesive substrate, followed by coagulation, washing, substance and stabilization, in order to improve the chemical resistance in organic solvents and improve the physicomechanical characteristics of the material. 56 the stabilization is carried out with a 0.005-1.0% or carboxylate complex of chromium with an organosilane solution of the general formula  KzSOO (CgS12) 20H, where R is alkyl, aryl, vinyl, perfluoro-5 alkyl; followed by heat treatment for RI is alkyl, phenyl; 4-10 min at 100-150 ° C. or orgaiosilia of the general formula RSi R 1 10 Source of information taken during where R is alkyl, perfluoroalkyl, and-attention during examination: NEIL, aryl; 1. USSR author's certificate, R2- halogen; No. 553260, cl. C 08 J 9/28, 1977 (prototype). 85i2S96