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Polyvinyl formal filtering membrane and preparation method thereof

A technology of polyvinyl formal and polyvinyl alcohol, which is applied in the field of polyvinyl formal filter membrane and its preparation, can solve the problems of long post-curing time, large amount of acid solution, low production efficiency, etc. The effect of shortening, simplifying the production process, and easy cleaning

Active Publication Date: 2013-02-13
BEIJING RADIATION APPL RES CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this process are mainly complex process, large amount of acid solution, long post-curing time, low production efficiency, and at the same time, due to the need to clean excessive aldehyde compounds and inorganic acids, a large amount of energy and water are consumed, resulting in an increase in cost. and severe environmental pollution

Method used

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  • Polyvinyl formal filtering membrane and preparation method thereof
  • Polyvinyl formal filtering membrane and preparation method thereof
  • Polyvinyl formal filtering membrane and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Embodiment 1, preparation polyvinyl formal filter membrane

[0030] The process flow chart prepared by the present invention is as figure 1 shown.

[0031] (1) Weigh 150g of PVA1799 particles, 850g of water, and stir at 95°C to prepare a 15% PVA aqueous solution by mass;

[0032] (2) Prepare starch dry powder: add water to cornstarch to make a paste, dry and grind and sieve, and take 150g of 120-160 mesh particles for later use;

[0033] (3) Mix 150g of starch granules prepared in (2) with 150g of water to prepare an aqueous starch solution, add 1.5g of surfactant span-60, and stir the mixed solution evenly for later use;

[0034] (4) Cool down the PVA aqueous solution in (1) to 50°C, add the mixed solution in (3), stir well for 20 minutes, and cool down to 40°C;

[0035] (5) Add 100g of formaldehyde solution with a mass percentage of 37% to the solution in (4), and stir thoroughly;

[0036] (6) Add 100g of sulfuric acid aqueous solution with a mass percentage of 35...

Embodiment 2

[0042] Embodiment 2, preparation polyvinyl formal filter membrane

[0043] The process flow chart prepared by the present invention is as figure 1 shown.

[0044](1) Weigh 200g of PVA1788 particles, 800g of water, and stir at 95°C to prepare a 20% PVA aqueous solution by mass;

[0045] (2) Prepare starch dry powder: add water to cornstarch to make a paste, dry and grind and sieve, take 400g of 80-mesh starch granules for later use;

[0046] (3) Mix 400g of starch granules prepared in (2) with 400g of water to prepare a starch aqueous solution, add 4g of surfactant span-60, and stir the mixed solution evenly for later use;

[0047] (4) Cool down the PVA aqueous solution in (1) to 50°C, add the mixed solution in (3), stir well for 20 minutes, and cool down to 40°C;

[0048] (5) Add 200g of formaldehyde solution with a mass percentage of 37% to the solution in (4), and stir thoroughly;

[0049] (6) Add 200g of sulfuric acid aqueous solution with a mass percentage of 35% to (5...

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Abstract

The invention discloses a polyvinyl formal filtering membrane and a preparation method thereof. The preparation method includes the following steps of adding an auxiliary and a starch aqueous solution to a polyving alcohol aqueous solution, and stirring the mixture to obtain a pasty material; adding a formaldehyde aqueous solution to the pasty material for performing cross-linking reaction to obtain an intermediate; adding a sulfuric acid aqueous solution to the intermediate, stirring the mixture, and injecting the mixture to a grinding tool for stewing to obtain a polyvinyl formal blank with low acetal degrees; washing the polyvinyl formal blank, and the placing the polyvinyl formal blank in an acetone solution of polyfunctionality acrylic ester for immersion; and irradiating and cross-linking an immersed product to obtain the polyvinyl formal filtering membrane. By means of irradiation, hardening post-processing of materials is performed so that mechanical properties of the materials are improved under the action of irradiation, water absorption of the materials is reduced, simultaneously, hardening processing steps are reduced, and using amount of formaldehyde in the synthetic process is greatly reduced so that the materials are easy to wash and environment pollution is reduced.

Description

technical field [0001] The invention relates to a polyvinyl formal filter membrane and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] The filter material is a porous material capable of retaining solid particles contained in the filter slurry to achieve solid-liquid separation. At present, domestic enterprises still use traditional filtration technology in the filtration process, and the filter media used are ordinary filter materials such as filter paper, filter cloth, metal filter screen, and activated carbon. The use of filter paper materials has the disadvantages of not being impact-resistant and prone to tissue fiber shedding. At the same time, after absorbing water, its wet strength is also low; metal filter screens also have problems such as poor filtration accuracy and acid and alkali resistance; The impact force is weak, and the liquid viscosity range to be adapted is small. [0003] Polyvinyl for...

Claims

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Application Information

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IPC IPC(8): B01D71/38
Inventor 王连才曹巍翟彤酒永斌翟宇曾心苗
Owner BEIJING RADIATION APPL RES CENT
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