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A disc type modified diaphragm

A disc type, modified technology, applied in the field of water treatment, can solve the problems of general film adhesion, high circular plate type diaphragm, low strength, etc. Effect

Active Publication Date: 2019-03-05
成都美富特膜环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Existing diaphragms used for membrane treatment are roughly divided into square plate diaphragms and circular plate diaphragms. Among them, the strength of square plate diaphragms is not too high, and they need to be supported and fixed by ABS boards to avoid bending deformation. The holes are line-shaped, which is easy to be fouled, and the adhesion of the film layer is also average, and there is a risk of peeling off; the relative strength of the circular plate film is relatively high. Although it can not be supported by an ABS board, the holes in the film are still line-shaped, which is easy fouling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The disc-shaped modified diaphragm includes modified PVDF membranes stacked up and down sequentially and pressed into a disc shape, supporting flow guide nets and modified PVDF membranes, and runs through all modified PVDF membranes and Support the installation through hole of the diversion net, and the peripheral edges of the upper and lower two layers of modified PVDF membranes are pressed into a closed one; Sexual coating composition.

[0026] The PVDF base film is made of a casting liquid composed of the following components in mass percent:

[0027] PVDF 16-30%, ethylene glycol monomethyl ether 15-20%, polyvinylpyrrolidone 20-25%, dimethylformamide 2-5%, dimethylpyrrolidone 10-15%, dimethyl sulfoxide 7 ~12%.

[0028] Specifically, the PVDF base film is made by the following process:

[0029] After mixing the components of the casting solution according to the amount, stir at a temperature of 65-100°C for 24-36 hours until they are uniformly dissolved to form a c...

Embodiment 2

[0035] The difference between this embodiment and embodiment 1 is:

[0036] Described film-casting liquid is made of the following components of mass percentage:

[0037] PVDF 30%, ethylene glycol monomethyl ether 18%, polyvinylpyrrolidone 22%, dimethylformamide 5%, dimethylpyrrolidone 14%, dimethylsulfoxide 11%.

[0038] Described compound modification reagent is uniformly dissolved in the solute that the polyvinyl alcohol of 15% mass percent, the maleic anhydride of 9% mass percent, the cumene peroxide of 0.5% mass percent and the polyvinylpyrrolidone of 1.9% mass percent constitute Made in ultrapure water solvent.

Embodiment 3

[0040] The difference between this embodiment and embodiment 1 is:

[0041] Described film-casting liquid is made of the following components of mass percentage:

[0042] PVDF 26%, ethylene glycol monomethyl ether 20%, polyvinylpyrrolidone 24%, dimethylformamide 4%, dimethylpyrrolidone 14%, dimethylsulfoxide 12%.

[0043] The composite modifying reagent is prepared by uniformly dissolving a solute composed of 18 mass percent polyvinyl alcohol, 12 mass percent maleic anhydride and 1 mass percent cumene peroxide in an ultrapure water solvent.

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Abstract

The invention discloses a disc-type modified membrane sheet which includes a modified PVDF membrane, a supporting and flow-guiding net and a modified PVDF membrane which are laminated vertically and successively and pressed into a disc-type structure. The membrane sheet also includes a mounting through hole penetrating the modified PVDF membranes and the supporting and flow-guiding net in the center of the disc-type structure. The periphery of the two modified PVDF membrane layers are pressed into an integrated and sealed structure. Each modified PVDF membrane is composed of a PVDF base membrane and a composite modifying coating on the surfaces of the PVDF base membrane. The membrane sheet is high in flexibility and is not liable to deform when being bent. The surface of the membrane sheet is smooth, so that water flow turbulent effect on the surface is improved and concentration polarization is reduced. Meanwhile, the hole in the membrane sheet is in a porous sponge net-like structure, so that the membrane sheet is greatly improved in anti-plug and anti-polluting performance. The surface of the membrane is subjected to electric potential treatment through the modifying agent, so that the membrane is better in hydrophilia, is strong in membrane layer adhesion force and is not liable to separate and strip off.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a disc type modified diaphragm. Background technique [0002] The principle of reverse osmosis technology is to separate these substances from water based on the fact that other substances cannot pass through the semi-permeable membrane under the action of the osmotic pressure higher than the solution. The membrane pore size of the reverse osmosis membrane is very small, so it can effectively remove dissolved salts, colloids, microorganisms, organic matter, etc. in water. The system has the advantages of good water quality, low energy consumption, no pollution, simple process and easy operation. It can be seen that reverse osmosis membrane is the core component of reverse osmosis technology, and the effect of reverse osmosis water treatment is directly related to the quality of reverse osmosis membrane. [0003] Existing diaphragms used for membrane treatment are roughl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/34B01D69/10
CPCB01D69/10B01D71/34
Inventor 宋岱峰韩亮李劲玲
Owner 成都美富特膜环保科技有限公司