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A polyoxymethylene nanoporous film with micro-nano double continuous porous structure and preparation method thereof

A technology of nanoporous film and porous structure, which is applied in the field of polyoxymethylene nanoporous film with micro-nano double continuous porous structure and its preparation, which can solve the problem of poor uniformity of microporous film pore structure, difficulty in mixing uniformly, and high requirements for production equipment. problem, to achieve the effect of high porosity, good mechanical strength and good ductility

Active Publication Date: 2015-09-09
HANGZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extremely small amount of β-crystal nucleating agent added in this process, it is difficult to mix evenly, and the conversion of α-crystal to β-crystal is not easy to control, resulting in poor pore distribution and pore structure uniformity of the microporous membrane. low porosity
In addition, the process has relatively high requirements for production equipment

Method used

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  • A polyoxymethylene nanoporous film with micro-nano double continuous porous structure and preparation method thereof
  • A polyoxymethylene nanoporous film with micro-nano double continuous porous structure and preparation method thereof
  • A polyoxymethylene nanoporous film with micro-nano double continuous porous structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Dry polylactic acid and polyoxymethylene in a vacuum drying oven at 80°C overnight, and then add 10g polylactic acid and 90g polyoxymethylene to the internal mixer. The temperature of the internal mixer is 190°C and the rotor speed is 20rpm / min. Mix for 1 min; then increase the rotor speed to 50 rpm / min and mix for 5 min before discharging, and cool to normal temperature. Then, the above-mentioned melt-kneaded mixture was hot pressed into a film with a thickness of 10 μm in a hot press at 190° C., and then quenched after hot pressing for 1 min. Then the film was immersed in a 1mol / L NaOH solution, kept at a constant temperature of 65°C for 120h, after hydrolysis to remove polylactic acid, washed with distilled water, and finally a polyoxymethylene nanoporous film was obtained.

Embodiment 2

[0047] The weight of the raw material polylactic acid in Example 1 was changed to 50 g, and the weight of POM was changed to 50 g, and the other experimental conditions were the same as in Example 1. Finally, the polyoxymethylene nanoporous film was obtained.

Embodiment 3

[0049] The weight of the raw material polylactic acid in Example 1 was changed to 60 g, and the weight of POM was changed to 40 g. The other experimental conditions were the same as those in Example 1. Finally, the polyoxymethylene nanoporous film was obtained.

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Abstract

The invention discloses a polyformaldehyde nanopore film with a micro-nano bicontinuous porous structure and a preparation method of the polyformaldehyde nanopore film. The film is 1-300mu m thick, has a nano bicontinuous porous structure and is made of polyformaldehyde. The method comprises the steps: drying polylactic acid and polyformaldehyde, adding the dried polylactic acid and polyformaldehyde into melting and mixing equipment for melting and mixing for 5-10min, discharging, cooling, then, melting and tabletting to prepare a film with the thickness of 1-300mu m, soaking the film into an alkaline solution of polylactic acid with the temperature of 65 DEG C for 120h to obtain the polyformaldehyde nanopore film; or extracting the film by using a Soxhlet extraction method to obtain the polyformaldehyde nanopore film, wherein a good solvent for the polylactic acid is used as an extraction solution, the heating temperature is controlled so that the extraction solution can reflow once every 6-8min, and the extraction time is 6-12h. The melt of polyformaldehyde can crystallize in the polyformaldehyde nanopore film to form double continuous support networks which are communicated with each other; and the film has favorable ductility and mechanical strength, high water flux and porosity and the arrangement of pores in the film is controllable.

Description

Technical field [0001] The invention relates to the field of polymer materials, in particular to a polyoxymethylene nanoporous film with a micro-nano double continuous porous structure and a preparation method thereof. Background technique [0002] With the development of science and technology, people's demand for porous materials is increasing. Among them, polymer porous membranes have been widely used, such as separation membranes and lithium battery separators. The preparation method of polymer porous membrane and the control of its process conditions are the key technologies to obtain stable membrane structure and excellent membrane performance. The film structure obtained by different film making methods and processes is different. According to the characteristics of the film material and its different purposes, different film making methods and forming processes should be adopted to adjust the structure and performance of the film to meet the requirements of various uses....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L59/00C08J9/26
Inventor 李勇进邱继善
Owner HANGZHOU NORMAL UNIVERSITY
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