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Porous membrane and preparation method thereof

A technology of porous membrane and pore-forming agent, applied in the field of porous membrane and its preparation, can solve the problems of low mechanical strength of polyimide porous membrane, easy collapse of pore structure, etc. Source-rich effects

Active Publication Date: 2013-08-14
BEIJING NANO ACE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the polyimide porous membranes prepared by these methods have low mechanical strength and easy collapse of the pore structure.

Method used

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  • Porous membrane and preparation method thereof

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preparation example Construction

[0048] figure 1 A method for producing a porous membrane according to the present invention is shown. According to this method, first enter the S1200 step to prepare polyimide acid containing nanocellulose; then enter the S1300 step to make the polyimide acid into a polyimide film; finally enter the S1400 step to remove the polyimide film Inorganic pore forming agent to obtain polyimide porous membrane. In the present invention, the nano cellulose is used as the reinforcing material of the polyimide porous membrane, which can significantly improve the mechanical properties of the polyimide porous membrane.

[0049] In order to further optimize the preparation method of the present invention to obtain a porous membrane with better performance, the present invention preferably adds the S1100 step before the S1200 step, such as figure 2 Shown: first enter the S1100 nanocellulose and the inorganic pore-forming agent surface modification step, nanocellulose and the inorganic por...

Embodiment 1

[0053] Such as figure 2 The preparation method first enters step S1100 to modify the surfaces of the nanocellulose and the inorganic pore-forming agent respectively. Weigh 3 parts by weight of nanocellulose (wherein the nanocrystalline cellulose accounts for 49% by mass of the nanocellulose), add 5 parts by weight of deionized water and 90 parts by weight of absolute ethanol, and magnetically stir Stir with a mixer or a stirring paddle at a speed of 20-200 rpm for 24 hours, add 2 parts by weight of aminopropyltriethoxysilane, stir at 60°C for 3 hours, and mix the reaction product with a speed of 1500 rpm After centrifugation, the obtained product is vacuum-dried to finally obtain surface-modified nanocellulose. The surface modification method of the inorganic pore-forming agent is the same as that of nanocellulose, so it will not be described in detail. Further, the surface modification method of nanocellulose and inorganic pore-forming agent in the following examples is th...

Embodiment 2

[0058] Such as figure 2 The preparation method first enters step S1100 to modify the surfaces of the nanocellulose and the inorganic pore-forming agent respectively. Secondly, enter the step S1200 to prepare polyimide acid containing nanocellulose: weigh 1 part by weight of modified nanocellulose powder in a dry 250ml three-necked flask, and 20 parts by weight of modified nanometer calcium carbonate powder, add 50ml In N,N-dimethylformamide (DMF), stir with a stirring blade at 100 rpm for 30 minutes, add 38 parts by weight of 4,4'-diaminodiphenyl ether, after fully dissolving, Under the conditions of ice-water bath and stirring, 41 parts by weight of pyromellitic dianhydride was added to the reaction system three times within 24 hours, until the reaction system was obviously viscous and then continued to stir for 3 hours.

[0059] Next enter step S1300 to make polyimide acid into polyimide film: drop 0.3 g of the above polyimide acid solution on a 30mm×50mm glass slide, plac...

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Abstract

The invention discloses a porous membrane and a preparation method thereof. According to the method, the porous membrane is prepared from the following required raw materials in parts by weight: 1 to 50 parts of nano cellulose, 20 to 50 parts of inorganic pore forming agent and 30 to 79 parts of diamine monomer and dianhydride monomer. The method comprises the following steps of: S1200 monomer polymerization; S1300 membrane forming; heat treatment; S1400 inorganic pore forming agent removing; and drying. The mechanical performance of the porous membrane prepared by using the method is improved significantly.

Description

technical field [0001] The invention relates to a membrane, in particular to a porous membrane and a preparation method thereof. Background technique [0002] The preparation method of polyimide porous membrane is a hot spot in recent years. The pore-forming methods in the prior art include admixture pore-forming, solvent exchange pore-forming, and stretching pore-forming. Publication No. CN101412817A discloses a polyimide film solidified in coagulation solution, and the solvent in the polyimide film overflows to form micropores in situ; Publication No. CN101665580A discloses a Polyol benzoate, dialkyl phthalate chlorinated paraffin and other organic substances are used as pore-forming agents, and then the pore-forming substances are decomposed and volatilized at 70-300°C to obtain polyimide. However, the polyimide porous membranes prepared by these methods have low mechanical strength and easy collapse of the pore structure. [0003] Therefore, the inventor hopes to prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L79/08C08L1/02C08J9/26C08J5/18C08G73/10
Inventor 蓝海黎国康
Owner BEIJING NANO ACE TECH CO LTD
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