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Method for preparing hydrophilic polypropylene microporous film

A technology of polypropylene microporous membrane and hydrophilicity, which is applied in the field of preparation of hydrophilic polypropylene microporous membrane, can solve the problems of large polymer film damage, complex process, expensive equipment, etc., and achieve reduction in dosage and process steps simple effect

Active Publication Date: 2012-09-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process is relatively complicated, and it is necessary to obtain a polypropylene microporous membrane first, and then carry out the ultraviolet photochemical grafting reaction of amphiphilic molecules with double bonds at the hydrophobic end on the polypropylene microporous membrane; and the hydrophilic polymer chain segment is mainly Concentrated on the surface of the membrane, the interior of the channel is still hydrophobic
Generally speaking, the disadvantages of this type of surface grafting treatment method are: or require relatively harsh conditions, expensive equipment, strong radiation, and large damage to polymer films; or only surface hydrophilization, and poor durability
The process of this method is relatively simple, but because the hydrophilic substance mainly exists in the polypropylene microporous membrane in the form of adsorption, it is easy to separate out from the polypropylene matrix and lose

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Materials: polypropylene (ethylene-propylene copolymer, ethylene content 2-3% (weight ratio), melt index 7.0g / 10min), soybean oil, polypropylene grafted maleic anhydride (Ningbo Nengzhiguang GPM200AL, grafting rate 1.0% (weight ratio), melt index is 30-40g / 10min), nano-calcium carbonate (Shanghai Shengshi Chemical Co., Ltd.).

[0027] Ratio of material: polypropylene: soybean oil=27: 73 (weight ratio), polypropylene graft maleic anhydride accounts for 10% of polypropylene and soybean oil gross weight, and nano calcium carbonate accounts for 0.5% of polypropylene and soybean oil gross weight .

[0028] Blend the above materials uniformly at 190°C by solution blending method;

[0029] The mixed material prepared in the above steps is formed into a film at 180°C by a flat scraping method;

[0030] Quenching the film prepared in the above steps in a constant temperature water bath at 40°C;

[0031] Extracting the film prepared in the above steps in cyclohexane;

[0032]...

Embodiment 2

[0034] Material: polypropylene (ethylene-propylene copolymer, ethylene content 2-3% (weight ratio), melt index 7.0g / 10min), polypropylene grafted maleic anhydride (Ningbo Nengzhiguang GPM200AL, grafting rate 1.0% ( weight ratio), the melt index is 30-40g / 10min), soybean oil, sebacic acid.

[0035] Material ratio: polypropylene: soybean oil=35: 65 (weight ratio), polypropylene graft maleic anhydride accounts for 0.5% of polypropylene and soybean oil gross weight, and pimelic acid accounts for 0.5% of polypropylene and soybean oil gross weight .

[0036] Blend the above materials uniformly at 200°C by solution blending method;

[0037] The mixed material prepared in the above steps is pressed into a film at 180°C by a flat hot press;

[0038] Quenching the film prepared in the above steps in a constant temperature water bath at 40°C;

[0039] Extracting the film prepared in the above steps in cyclohexane;

[0040] Soak the membrane prepared in the above steps for 10 h in 5% ...

Embodiment 3

[0042] Materials: polypropylene F401 (melt index 1.4-3.2g / 10min), soybean oil, dibutyl phthalate, polypropylene grafted with maleic anhydride (Ningbo Nengzhiguang GPM200AL, grafting rate 1.0% (weight ratio ), the melt index is 30-40g / 10min), nano-calcium carbonate (Shanghai Shengshi Chemical Co., Ltd.).

[0043] Ratio of materials: polypropylene: soybean oil: dibutyl phthalate=30:50:20 (weight ratio), polypropylene graft maleic anhydride accounts for 10% of polypropylene and soybean oil gross weight, nanometer calcium carbonate accounts for 1% by combined weight of polypropylene and soybean oil.

[0044] The above materials were blended uniformly by solution blending at 180°C;

[0045] The mixed material prepared in the above steps was scraped on a polytetrafluoroethylene flat plate at 160°C to form a film.

[0046] Quenching the film prepared in the above steps in a constant temperature water bath at 30°C;

[0047] Extract the film prepared in the above steps in n-hexane;

...

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Abstract

The invention relates to a method for preparing hydrophilic polypropylene microporous film. The method includes subjecting low-melting-index polypropylene and diluents in a weight ratio of (20:80) to (80:20), a blending compatilizer containing polar groups and accounting for 0.5% to 20% of the total weight of the polypropylene and the diluents, and a material which is composed of nucleating agents and accounting for 0.05% to 10% of the total weight of the polypropylene and the diluents to solution blending or melt blending at a temperature ranging from 180 DEG C to 210 DEG C to obtain mixed materials; forming film by using a film scraping method or a hot-press method at a temperature of 170 DEG C to 190 DEG C; quenching the film in thermostatic waterbath at a temperature between 0 DEG C and 50 DEG C; extracting the film in an extracting agent to remove the diluents; dipping the film in a hydrochloric acid aqueous solution, and washing the film through distilled water and drying the film to obtain the hydrophilic polypropylene microporous film. According to the hydrophilic polypropylene microporous film prepared by the method, the average bore diameter range is between 0.1 micron and 10.0 microns, poriness is larger than or equal to 40%, and the water contact angle is smaller than or equal to 95 degrees.

Description

technical field [0001] The invention relates to a preparation method of a hydrophilic polypropylene microporous membrane. Background technique [0002] Polypropylene microporous membranes are widely used in many fields such as lithium-ion secondary battery separators, biomedical separation membranes, wastewater treatment, ultrafiltration separation, microfiltration separation, membrane distillation, etc. The preparation methods mainly include particle sintering, melt extrusion Stretching method, filling method and thermally induced phase separation method (Castro US 4,247,498), etc. Polypropylene microporous membrane has strong hydrophobicity and is easily polluted during use, resulting in a decrease in its separation ability and an increase in cleaning costs, thus limiting its application fields. [0003] At present, the preparation of hydrophilic and surface-functionalized polyolefin microporous film materials has become one of the research hotspots in this field (Dana et...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08L23/12C08L23/16C08L51/06C08K5/092C08K3/26
Inventor 义建军卢晓英马志姜凯王莉祖凤华赵亮赵巧玲
Owner PETROCHINA CO LTD
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