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A kind of polypropylene separation membrane and preparation method thereof

A technology for separating membranes and polypropylene, applied in the field of material science, can solve problems such as unfavorable adjustment of diluent and polymer compatibility, great influence on the distribution of membrane pore size, uneven distribution of membrane voids, etc., and achieve good application prospects, Effect of high water flux and shortened degassing time

Active Publication Date: 2017-06-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Chinese patent CN101862601 discloses a polypropylene hollow fiber microporous membrane and its preparation method. The method uses polypropylene as raw material, DBP and diphenyl ether (DPE) with a strong and unpleasant smell as diluents. At the same time, the method Macromolecular additives such as polyethylene glycol used in the method have a great influence on the distribution of membrane pore size, and the hollow fiber microporous membrane prepared according to this method has problems such as uneven distribution of membrane voids and poor tensile strength of the membrane.
[0010] The preparation method of the polypropylene hollow fiber microporous membrane disclosed in Chinese patent CN1356410A is to use one of vegetable oil, liquid paraffin, diphenyl ether and machine oil as a single diluent, which is not conducive to adjusting the compatibility between the diluent and the polymer , and the polymer content used reaches 40-55%, which makes the casting liquid prone to liquid-solid phase separation, there are a large number of spherulites in the microporous membrane, and the mechanical properties of the product are poor

Method used

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  • A kind of polypropylene separation membrane and preparation method thereof
  • A kind of polypropylene separation membrane and preparation method thereof
  • A kind of polypropylene separation membrane and preparation method thereof

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preparation example Construction

[0066] The concrete steps of preparation method of the present invention are as follows:

[0067] (1) In the spinning kettle with stirring device, add polypropylene resin, diluent and additives according to the proportion, heat to 175-200°C, every increment or decrement of 1°C within the value range can be used as an option Specific embodiment, and stir 0.5~3 hours under the condition of flowing nitrogen, in the range of values, each incremental or decreasing 0.5h can be used as an optional specific embodiment to obtain casting solution; the process parameters of nitrogen flow are as follows: Existing technology implementation, no more details;

[0068] The mass percentage of the polypropylene resin is 10-35%, the melt index of the polypropylene resin is 0.1-8g / 10min, and every increment or decrement of 0.1g / 10min within the value range can be used as an optional specific embodiment,

[0069] The mass percentage of diluent is 65-90%,

[0070] The amount of additive added is ...

Embodiment 1

[0091] A polypropylene separation membrane and a preparation method thereof, the specific steps are as follows:

[0092] (1) Add polypropylene resin, diluent and additives to the spinning kettle with stirring device, the mass percentage of polypropylene resin is 10%, the melt index is 0.1g / 10min, soybean oil and phthalic acid bicyclic The mixture of hexyl esters is used as a diluent, the mass percentage is 90%, the soybean oil content in the diluent is 90%, benzoic acid is used as an additive, and the addition amount is 0.1% of the polypropylene resin mass, heated to 175 ° C, and under nitrogen conditions Down stirring 0.5 hour, obtains film-casting solution;

[0093] (2) The casting solution in step (1) is input into the screw extruder through a pipeline with a temperature of 175°C and extruded. Soybean oil and bis(2-propylheptyl) phthalate are introduced into the spinneret as an internal coagulation medium to form a hollow fiber. The content of soybean oil in the internal c...

Embodiment 2

[0097] A polypropylene separation membrane and a preparation method thereof, the specific steps are as follows:

[0098] (1) Add polypropylene resin, diluent and additives to the spinning kettle with stirring device, the mass percentage of polypropylene resin is 35%, the melt index is 8g / 10min, peanut oil and phthalic acid bis(2- The mixture of propylheptyl) ester is used as a diluent, the mass percentage is 65%, the peanut oil content in the diluent is 10%, adipic acid is used as an additive, and the addition amount is 1% of the polypropylene resin mass, heated to 200 ° C, and Stirring under nitrogen condition for 3 hours to obtain casting solution;

[0099] (2) The casting solution in step (1) is input into the screw extruder through a pipeline with a temperature of 200°C and extruded, and the extruded casting solution is transported to the spinneret by a gear metering pump, and the Peanut oil and bis(2-propylheptyl) phthalate are introduced into the spinneret as an interna...

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Abstract

The invention relates to a polypropylene separation membrane and a preparation method thereof, and the polypropylene separation membrane comprises the following components by mass: 10-35% of polypropylene resin, 65-90% of a diluent, and an additive accounting for 0.1-1% by mass of the polypropylene resin. According to the method, a casting membrane solution is prepared from the polypropylene resin, the diluent and the additive, the casting membrane solution is conveyed to a spinneret by a screw extruder, an inner solidification medium is introduced into the spinneret to form a hollow fiber membrane, the hollow fiber membrane is cooled and solidified by an outer solidification medium, then is rolled, is extracted and dried to remove an extraction agent to obtain the polypropylene separation membrane product. According to the polypropylene separation membrane and the preparation method, the casting membrane solution free of dibutyl phthalate (DBP) and dioctyl-phthalate (DOP) is used, the polypropylene hollow fiber separation membrane with a large number of micropores on the outside surface is prepared by a safe, environmentally friendly and simple technology, the defoaming time of the process is shortened, and the membrane has high water flux.

Description

technical field [0001] The invention relates to the field of material science, in particular to a polypropylene separation membrane and a preparation method thereof. Especially the polypropylene hollow fiber separation membrane and its preparation method. Background technique [0002] As a high-efficiency separation technology, membrane technology has been used in sewage treatment and reuse, pure water production, chemical industry, energy, seawater desalination, brackish water desalination, municipal water supply, electronics industry, pharmaceuticals, etc. after decades of rapid development. And bioengineering, food, textile and other fields have been widely used. [0003] In the application of membrane technology, the membrane material is the basis and core of the development and application of membrane technology, and the performance of the membrane material directly affects the performance of the separation membrane. Polypropylene (PP) is a polyolefin material with la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/26B01D67/00B01D69/08
Inventor 奚振宇王玉杰魏昕彭海珠杨丽
Owner CHINA PETROLEUM & CHEM CORP
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