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Method for preparing polyvinyl formal (PVF) micro-filtration membrane

A polyvinyl formal and polyvinyl alcohol technology, which is applied in the field of preparation of polyvinyl formal microfiltration membranes, can solve the problems of conflicting filtration precision and flow rate, etc.

Active Publication Date: 2011-08-17
四川好鑫量子科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Completely solve the problem of the contradiction between filtration accuracy and flow rate

Method used

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Embodiment Construction

[0008] Dissolving polyvinyl alcohol (PVA) in water, adding secondary alkyl sulfonate, stirring evenly under heating, adding any one of sulfuric acid, hydrochloric acid or phosphoric acid for catalysis. Add sodium silicate porosity aid with an average particle size of micron level. Stir and heat to 55°C to 60°C, then add formaldehyde and stir evenly to obtain a foamed porous body mixture. Pour the mixture into a cylindrical mold or a sheet mold, move it into a water bath or a temperature control device and raise the temperature to 85°C-95°C, after the acetal reaction for 3-4 hours, take out the solid matter in the mold, and then put it in sodium hydroxide In the aqueous solution, remove the residual substances in the solid matter, rinse with clean water, and dry in a drying oven to obtain a white polymer "PVF" microporous filtration membrane with any average pore size. Wherein the raw materials are all described in parts by weight. 80-90 parts of polyethylene (PVA), 40-110 pa...

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PUM

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Abstract

The invention discloses a method for preparing a polyvinyl formal (PVF) micro-filtration membrane with high porosity and random average aperture adjustability. The method comprises the following steps of: dissolving polyvinyl alcohol (PVA) into water, adding secondary alkyl sulfonate, stirring the solution uniformly with heating, and adding any one of sulfuric acid and phosphoric acid for catalyzing; adding any pore auxiliary agent with micro-scale average grain diameter such as sodium silicate, heating the solution to the temperature of between 50 and 60 DEG C with stirring, adding formaldehyde, and stirring the solution uniformly to obtain foamed porous mixture; and injecting the mixture into a cylindrical die or a flaky die, transferring the die into a water bath kettle or a temperature control device, heating the mixture to the temperature of between 80 and 95 DEG C, performing acetalization reaction for 2 to 4 hours, then taking out the solid in the die, putting the solid into aqueous solution of sodium hydroxide and phenyl dimethylamine, removing the residual substances in the solid, rinsing the solid by using clean water, and drying the solid in a drying oven to obtain the white macromolecular PVF micropore filtration membrane with random average aperture.

Description

1. Technical field [0001] The invention relates to a preparation method of polyvinyl formal (PVF) microfiltration membrane. 2. Background technology [0002] At present, microporous filtration membranes have low porosity (generally 70-80%), high cost of membrane raw materials (such as polytetrafluoroethylene, polyvinylidene fluoride), contradictions between flow and precision, and membrane fouling. For example: US19860939159 is a multifunctional high-precision filter. The filter is composed of a water inlet valve 1, a coarse filter 2, a sewage discharge valve 3, a magnetic filter 4, a pump 5, a fine filter 6, an outlet valve 7, and a machine body 8, wherein the magnetic filter core is A high molecular polyvinyl fluoride filter core fine filter is installed in the magnetic filter 4 and installed in the 6 . Passed through the water inlet valve, the fluid is filtered through the coarse filter, magnetic filter, pump and pipeline along the coarse filter, and then flows out of t...

Claims

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Application Information

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IPC IPC(8): B01D71/38B01D67/00B01D69/02
Inventor 银永发李祥华赵文华陈光明
Owner 四川好鑫量子科技有限公司
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