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A polyvinylidene fluoride hierarchical porous film with sea-island structure and preparation method thereof

A technology of polyvinylidene fluoride and sea-island structure, which is applied in the field of polymer materials, can solve the problem that the improvement of interception efficiency and the improvement of separation flux cannot be taken into account, and achieve good self-supporting performance, good ductility and excellent effect

Active Publication Date: 2022-02-18
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Usually the interception efficiency comes from the control of the pore size, and the separation flux will also decrease with the decrease of the pore size, so the improvement of retention efficiency and the increase of separation flux are often unable to be balanced

Method used

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  • A polyvinylidene fluoride hierarchical porous film with sea-island structure and preparation method thereof
  • A polyvinylidene fluoride hierarchical porous film with sea-island structure and preparation method thereof
  • A polyvinylidene fluoride hierarchical porous film with sea-island structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Dry polyvinylidene fluoride, polymethyl methacrylate and polylactic acid in a vacuum oven at 80°C overnight;

[0047]20g of polyvinylidene fluoride, 20g of polymethyl methacrylate and 10g of polylactic acid were sequentially added to the internal mixer, the temperature of the internal mixer was 200°C, the rotor speed was 20rpm / min, and the mixer was mixed for 2min; then the rotor speed was increased to 50rpm / min and banburying for 10min, discharge and cool to room temperature.

[0048] The mixture after melting and kneading is hot-pressed into a film with a thickness of 150 μm in a hot press at 200° C., and then quickly transferred to 140-150° C. for annealing treatment for 3-12 hours after hot-pressing for 1-3 minutes.

[0049] Use the Soxhlet extraction method to extract, the extract is a good solvent for polylactic acid and polymethyl methacrylate, the heating temperature is controlled so that the extract is refluxed every 6 to 8 minutes, and the extraction time is 6...

Embodiment 2

[0051] In Example 1, the contents of polyvinylidene fluoride, polymethyl methacrylate and polylactic acid were controlled to remain unchanged, and 0.05% compatibilizer was added. Other experimental conditions were the same as in Example 1, and finally polyvinylidene fluoride multi-stage Porous film.

Embodiment 3

[0053] In Example 1, the contents of polyvinylidene fluoride, polymethyl methacrylate and polylactic acid were controlled to remain unchanged, and 0.5% compatibilizer was added. Other experimental conditions were the same as in Example 1, and finally polyvinylidene fluoride multi-stage Porous film.

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Abstract

The invention discloses a sea-island structure polyvinylidene fluoride hierarchical porous film and a preparation method thereof. The film has a multi-level pore structure of island-shaped micron-scale round holes and nano-scale slit holes, and is made of polyvinylidene fluoride. The method is to dry polyvinylidene fluoride, polymethyl methacrylate, polylactic acid and compatibilizer, and then add to melting and mixing equipment to melt and mix for 5-10 minutes, and then cool to normal temperature, and then melt and press to prepare a thickness of 1 ~150μm film, the film was extracted by Soxhlet extraction. Polyvinylidene fluoride and polymethyl methacrylate form a sea phase, polylactic acid independently forms an island phase, and polyvinylidene fluoride crystallizes itself in the sea phase of the film to form a nanoscale three-dimensional interpenetrating network, making the independent island phase The connection is adjustable in two stages; compared with the single-stage pore film, the obtained film has a 2.1-fold increase in flux, and maintains the interception efficiency, while having good ductility and mechanical strength.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a preparation method for obtaining a polyvinylidene fluoride film with a multi-level pore structure through the combination of incompatible system phase separation and crystallization-induced phase separation. Background technique [0002] Due to the great application potential of polymer porous membranes in the fields of separation membranes and battery separators, their preparation methods have received extensive attention. According to the different application fields of polymer porous membranes, the design of membrane structure has become the focus of the preparation of polymer porous membranes. In the actual use of polymer porous separation membranes, their retention efficiency and separation flux have become important indicators for evaluating their separation efficiency. Usually the interception efficiency comes from the control of the pore size, and the separation flux w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J9/26C08J7/00C08L27/16C08L33/12C08L67/04
CPCC08J5/18C08J9/26C08J7/08C08J2327/16C08J2433/12C08J2467/04
Inventor 李勇进由吉春王佳耀
Owner HANGZHOU NORMAL UNIVERSITY