Preparation method of plate polypropylene separation membrane

A polypropylene membrane, polypropylene technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of easy skin layer, high equipment requirements, unfavorable membrane promotion and application, etc., and achieve excellent chemical resistance. performance, improving surface pore-forming properties, and the effect of good application prospects

Active Publication Date: 2012-10-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The polypropylene separation membrane prepared by the stretching method that is widely used today has problems such as low porosity, wide pore size distribution, and low flux, which are difficult to meet the requirements of large-scale applications. However, the polypropylene separation membrane prepared by the TIPS method is prone to skin. Affect the permeability of the membrane
[0006] At present, it is very easy to obtain a dense skin layer by using the homopolymerized polypropylene resin and the polypropylene flat film prepared by the scraping process. However, due to the high melting index of the resin used, the thickness of the microporous film is large, and the penetration resistance is relatively high. high, which is not conducive to the popularization and application of membranes; in addition, the method of heating samples in flat-bottomed containers to prepare polypropylene flat membranes is difficult to control the thickness of the membranes, which is not conducive to the preparation of separation membranes with uniform structural properties; and the current application uses TIPS Combined with the stretching method to prepare polypropylene flat separation membrane, although the skin structure can be destroyed, it is difficult to ensure uniform pore size after stretching, and the stretching process is complicated and requires high equipment requirements

Method used

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  • Preparation method of plate polypropylene separation membrane
  • Preparation method of plate polypropylene separation membrane
  • Preparation method of plate polypropylene separation membrane

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Adopt the method comprising following steps to prepare polypropylene flat separation membrane:

[0035] (1) add polypropylene resin and diluent in the container with stirring device, the mass percent of polypropylene resin is 20%, and melt index is 2g / 10min, and ethylene content is 0.3% in the resin, and soybean oil is as diluent, The mass percentage is 80%, heated to 200° C., and stirred for 3 hours under the condition of nitrogen flow, and left to defoam for 2 hours after stopping the stirring to obtain the casting solution;

[0036] (2) cooling the casting solution in liquid nitrogen, the cooling time is 30 minutes, to obtain a solidified sample;

[0037] (3) Take a certain cured sample and place it between the upper and lower layers of polyimide diaphragms, and place a 150mm×150mm metal foil in the middle on the upper diaphragm. The thickness of the metal foil is 100μm, and then put Put it into a preheated flat mold, heat it to 200°C, pressurize and keep it for 10 ...

Embodiment 2

[0041] Adopt the method comprising following steps to prepare polypropylene flat separation membrane:

[0042] (1) Add polypropylene resin and diluent in the container with stirring device, the mass percent of polypropylene resin is 40%, and melt index is 19g / 10min, and ethylene content is 15% in the resin, and peanut oil is as diluent, mass The percentage is 60%, heated to 175°C, and stirred for 0.5 hours under the condition of flowing nitrogen, and left to defoam for 0.5 hours after stopping the stirring to obtain the casting solution;

[0043](2) cooling the casting solution in an ice-water mixture for 30 minutes to obtain a solidified sample;

[0044] (3) Take a certain cured sample and place it between the upper and lower layers of polyimide diaphragms, and place a metal foil of 150mm×150mm in the middle on the upper diaphragm. The thickness of the metal foil is 400μm, and then put Put it into a preheated flat mold, heat it to 175°C, pressurize and keep it for 5 minutes,...

Embodiment 3

[0048] Adopt the method comprising following steps to prepare polypropylene flat separation membrane:

[0049] (1) Add polypropylene resin and diluent in the container with stirring device, the mass percent of polypropylene resin is 25%, and melt index is 2.7g / 10min, castor oil is as diluent, and mass percent is 75%, heating to 180°C, and stirred for 1 hour under the condition of flowing nitrogen, and then stood still for defoaming for 1 hour after stopping the stirring to obtain the casting solution;

[0050] (2) cooling the casting solution in liquid nitrogen, the cooling time is 10 minutes, to obtain a solidified sample;

[0051] (3) Take a certain cured sample and place it between the upper and lower layers of polyester film, and place a 150mm×150mm metal foil in the middle on the upper film. The thickness of the metal foil is 150μm, and then put it into the In the preheated flat mold, heat to 180°C, keep pressurized for 10 minutes, and cool the mold with a water cooling ...

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Abstract

The invention relates to a preparation method of a plate polypropylene separation membrane. The method comprises the steps that: (1) polypropylene resin and a diluent are mixed and stirred; the mixture is stood and de-foamed, so that a membrane casting solution is obtained; (2) the membrane casting solution is cooled, so that a cured sample is obtained; (3) the cured sample is hot-pressed into a prefabricated polypropylene membrane containing the diluent; (4) the prefabricated polypropylene membrane is extracted in an extractant; (5) the extracted polypropylene membrane is fetched and dried; the extractant is removed; and the polypropylene plate separation membrane provided by the invention is obtained. The preparation method provided by the invention is simple and is easy to operate and realize. The prepared polypropylene plate separation membrane has a large amount of micropores on the surface, and has good permeability. The resistance of the membrane is low, the pore sizes of the membrane are uniform, and the porosity is relatively high. The membrane can be widely applied in fields of water treatment, membrane distillation, biology, medicine, energy, and the like. The membrane has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of membrane material preparation, in particular to a method for preparing a flat polypropylene separation membrane. Background technique [0002] As an emerging high-efficiency separation technology, membrane technology has developed rapidly in recent years and is an energy-saving separation process that has been industrialized. Developed countries such as Europe, America and Japan have always positioned membrane separation technology as a high-tech, and invested a lot of research power to promote the rapid development of membrane separation technology. Membrane separation technology has been widely used in environmental protection, chemical industry, pure water production, seawater desalination, brackish water desalination, municipal water supply, electronics industry, pharmaceutical and biological engineering, food, textile and other fields. In the application of membrane technology, the membrane material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/26B01D67/00B01D69/06
Inventor 奚振宇杨永强王玉杰李井峰张新妙
Owner CHINA PETROLEUM & CHEM CORP
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