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Hollow fiber blend membrane and method for manufacturing same

A technology of blending membranes and fibers, applied in the field of materials, can solve the problems of membrane flux attenuation, increase of transmembrane pressure difference, poor acid and alkali resistance, etc., and achieve improved hydrophilic durability, improved properties, and increased selectivity Effect

Active Publication Date: 2013-01-16
宁波博乐宝科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for the membranes prepared by the above method, the biggest problem in membrane application is that the membrane flux decays or the transmembrane pressure difference increases due to the fouling of the membrane during use. Restore the membrane flux, but the hydrophilic materials coated or cross-linked on the membrane surface, such as polyvinyl alcohol, polyvinylpyrrolidone or chitosan, have poor acid and alkali resistance, especially poor oxidation resistance, It is very easy to lose the hydrophilicity of the membrane during chemical cleaning, reducing the membrane's anti-fouling and high water flux

Method used

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  • Hollow fiber blend membrane and method for manufacturing same
  • Hollow fiber blend membrane and method for manufacturing same
  • Hollow fiber blend membrane and method for manufacturing same

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preparation example Construction

[0063] The present invention also provides a method for preparing the above-mentioned hollow fiber blend membrane, comprising the following steps:

[0064] A. Dissolving the polyvinylidene fluoride resin and polymethyl methacrylate blend in a water-soluble compound solvent at a temperature of 190°C-210°C to prepare a casting solution;

[0065] B. carrying out degassing treatment to the casting solution to form a homogeneous casting solution;

[0066] C. Spinning the homogeneous casting solution and the core solution after the degassing treatment and undergoing thermal phase separation to form the first hollow fiber blended membrane intermediate;

[0067] D. Extracting the first hollow fiber blended membrane intermediate formed in step C to obtain a second hollow fiber blended membrane intermediate;

[0068] E. Hydrolyzing the second hollow fiber blended membrane intermediate to hydrolyze polymethyl methacrylate into carboxyl anion form.

[0069] Through the method of polymer...

Embodiment 1

[0112] Mix the dried 35wt% powdered polyvinylidene fluoride homopolymer (SOLEF6010, MW=350,000) and 5wt% granular random polymethyl methacrylate (CM205, MW=70,000-80,000) evenly, add to In the stirring tank, then add N-methylpyrrolidone as the first solvent and glycerol compound solvent as the second solvent, wherein the concentration of N-methylpyrrolidone is 22wt%, and the concentration of glycerol is 38wt%.

[0113] The above mixture was stirred for 24 hours at a temperature of 200° C. at a rotational speed of 100 rpm, and vacuum defoamed at a temperature of 200° C. for 8 hours to obtain a homogeneous casting solution.

[0114] Keep the casting liquid at 200°C and pass through a 250-mesh filter before entering the intubation spinneret and spraying out together with the core liquid in the center tube of the nozzle. The core fluid is composed of 40wt% deionized water, 30wt% N-methylpyrrolidone, and 30wt% glycerol. The ejected casting solution was spun by 25 cm of air, cooled...

Embodiment 2

[0122] Except that in the N-methylpyrrolidone as the first solvent and the glycerol mixed solvent as the second solvent, wherein the concentration of N-methylpyrrolidone is 20wt%, and the concentration of glycerol is 40wt%, the others are the same as in Example 1.

[0123] The performance of the obtained thermotropic hydrophilic polyvinylidene fluoride hollow fiber blend membrane is as follows:

[0124] Among them, the inner and outer diameters of the second hollow fiber blended membrane intermediate are 0.8mm / 1.3mm, the porosity is 68%, the pure water flux is 480L / m2·h·bar·25℃, the average pore diameter is 0.07μm, and the tensile strength Greater than 6.3N / mm2, the elongation rate is 150%, and the compressive strength is greater than 0.6Mpa.

[0125] The inner and outer diameter of the finished hollow fiber blend membrane is 0.8mm / 1.3mm, the porosity is 68%, the pure water flux is 570L / m2·h·bar·25℃, the average pore diameter is 0.07μm, and the tensile strength is greater than...

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Abstract

The invention relates to a hollow fiber blend membrane and a method for manufacturing the same. The hollow fiber blend membrane comprises polyvinylidene fluoride resin and polymethyl methacrylate, and the polymethyl methacrylate is in a carboxyl anion form in the hollow fiber blend membrane. The method for manufacturing the hollow fiber blend membrane includes A, dissolving blends of the polyvinylidene fluoride resin and the polymethyl methacrylate in water-soluble compound solvents at the temperature ranging from 190 DEG C to 210 DEG C to prepare cast film liquid; B, defoaming the cast film liquid to form homogenous cast film liquid; C, spinning the homogenous cast film liquid obtained after defoaming and core liquid and performing thermally induced phase separation for the homogenous cast film liquid and the core liquid to form a first hollow fiber blend membrane intermediate; D, extracting the first hollow fiber blend membrane intermediate formed in the step C to obtain a second hollow fiber blend membrane intermediate; and E, hydrolyzing the second hollow fiber blend membrane intermediate and hydropyzing the polymethyl methacrylate into the carboxyl anion form. The hollow fiber blend membrane and the method have the advantage that the hydrophilicity of the membrane can be improved.

Description

technical field [0001] The invention relates to the field of materials, in particular to a hollow fiber blended membrane and a preparation method thereof. Background technique [0002] Polymer porous membranes are widely used in filtration treatment, especially in the field of liquid filtration. Polymer porous membranes are generally prepared by the non-solvent-induced phase separation method, that is, the method of exchanging solvent and non-solvent in the casting solution to cause phase separation (NIPS for short). However, the polymer materials that can be used for the non-solvent-induced phase separation method are relatively limited, and the immersion precipitation method is generally used to use the interdiffusion of the non-solvent and the solvent in the casting solution to form membrane pores, the exchange speed is slow, and the pore size The size control is difficult, the pore size distribution is relatively dispersed, and the solvent participates in gelation, resu...

Claims

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Application Information

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IPC IPC(8): B01D71/34B01D71/48B01D67/00B01D69/08B01D69/02
Inventor 周钱华刘忠洲赵亮吕宾徐晓凤
Owner 宁波博乐宝科技有限公司
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