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Polyvinylidene fluoride microporous stretched film with ultra-large flux and preparation method of polyvinylidene fluoride microporous stretched film

A polyvinylidene fluoride and polyvinylidene fluoride resin technology, which is applied in the field of ultra-large flux polyvinylidene fluoride microporous stretched membrane and its preparation, can solve the problems such as not being able to fully meet its requirements, and achieve high flux and high product quality. Stable performance and high throughput

Inactive Publication Date: 2019-03-15
上海一鸣过滤技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polyvinylidene fluoride microporous membrane products cannot fully meet its requirements in this respect.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 160 grams of polyvinylidene fluoride resin, with a molecular weight of 560000, 80 grams of polyvinylpyrrolidone (PVP-K30), 40 grams of PEG400 (AR), were dissolved in 720 grams of dimethylacetamide (AR) at 70 ° C to form a casting Membrane fluid. Leave the casting solution at 40°C for about 24 hours for defoaming, then apply the casting solution evenly on the stainless steel roller, adjust the wet film thickness to 150 microns, and then enter the coagulation bath, pull Stretching and cleaning baths. Wherein the dimethylacetamide content in the coagulation bath is 15wt%, and the temperature is 40 ℃, and the residence time in the air is 30s, and the residence time in the coagulation bath is 3min; the dimethylacetamide content in the stretching bath is 10wt%, and the temperature The temperature is 30°C, the residence time is 5 minutes, the stretching rate is 20mm / min, and the stretching time is set to 60s; the cleaning bath is pure water, the temperature is 85°C, the resid...

Embodiment 2

[0029] 160 grams of polyvinylidene fluoride resin, with a molecular weight of 560000, 80 grams of polyvinylpyrrolidone (PVP-K30), 40 grams of PEG400 (AR), were dissolved in 720 grams of dimethylacetamide (AR) at 70 ° C to form a casting Membrane fluid. Leave the casting solution at 40°C for about 24 hours for defoaming, then apply the casting solution evenly on the stainless steel roller, adjust the wet film thickness to 150 microns, and then enter the coagulation bath, pull Stretching and cleaning baths. Wherein the dimethylacetamide content in the coagulation bath is 15wt%, and the temperature is 40 ℃, and the residence time in the air is 30s, and the residence time in the coagulation bath is 3min; the dimethylacetamide content in the stretching bath is 10wt%, and the temperature The temperature is 30°C, the residence time is 5 minutes, the stretching rate is 30mm / min, and the stretching time is set to 60s; the cleaning bath is pure water, the temperature is 85°C, the resid...

Embodiment 3

[0032] 180 grams of polyvinylidene fluoride resin, the molecular weight is 560000, 100 grams of polyvinylpyrrolidone (PVP-K30), 40 grams of n-butanol (AR), dissolved in 680 grams of dimethylacetamide (AR) at 70 ° C become casting solution. Leave the casting solution at 40°C for about 24 hours for defoaming, then apply the casting solution evenly on the stainless steel roller, adjust the wet film thickness to 150 microns, and then enter the coagulation bath, pull Stretching and cleaning baths. Wherein the dimethylacetamide content in the coagulation bath is 10wt%, and the temperature is 40 ℃, and the residence time in the air is 30s, and the residence time in the coagulation bath is 3min; the dimethylacetamide content in the stretching bath is 10wt%, and the temperature The temperature is 30°C, the residence time is 5 minutes, the stretching rate is 30mm / min, and the stretching time is set to 60s; the cleaning bath is pure water, the temperature is 85°C, the residence time is ...

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Abstract

The invention relates to a polyvinylidene fluoride microporous stretched film with ultra-large flux and a preparation method of the polyvinylidene fluoride microporous stretched film. The method comprises the following steps: 1) dissolving polyvinylidene fluoride resin in an organic solvent, adding a pore-forming agent, and fully stirring the mixture to form uniform and stable film casting solution; 2) forming a film: the casting solution is uniformly cast on a stainless steel roller, a film is taken out after standing in the air and passing through coagulating bath, stretching bath and cleaning bath sequentially, and is dried, and a plate microporous film, namely, the polyvinylidene fluoride microporous stretched film with ultra-large flux, is obtained. Compared with the prior art, the film making process combining a phase conversion process and a stretching process is adopted, the film subjected to preliminary phase conversion is not completely formed, and the polymer lattice arrangement form is changed through external transverse pulling force, so that the purposes of controlling pore diameter and influencing porosity are achieved, and the product has the characteristics of being large in flux, pollution resistant and the like.

Description

technical field [0001] The invention relates to the technical field of membrane materials, in particular to an ultra-large flux polyvinylidene fluoride microporous stretched membrane and a preparation method thereof. Background technique [0002] Polyvinylidene fluoride microporous membrane is a kind of filter membrane with relatively mature technology at present. Its excellent mechanical properties and good chemical stability make it widely used in the fields of food, electronics, beverages, chemicals, biochemical pharmaceuticals, and medical care. application. At present, this kind of membrane is mainly prepared by phase inversion or thermal mass phase film formation, but the membranes prepared by these two methods have the defect of low flux, which makes them unavailable in the fields that require large flux and rapid filtration. application. [0003] In the fields that require large flux and rapid filtration (such as plasma filtration, syrup filtration, etc.), it is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/34B01D69/02B01D69/06B01D61/14B01D67/00
CPCB01D61/147B01D67/0011B01D67/0013B01D67/0016B01D69/02B01D69/06B01D71/34B01D2325/02B01D2325/34
Inventor 杨刘吴昌飞
Owner 上海一鸣过滤技术有限公司
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