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Phosphoric acid solution-based regenerated cellulose membrane and preparation method thereof

A technology of regenerated cellulose membrane and phosphoric acid solution, applied in the field of cellulose dissolving, can solve the problem of insufficient strength of regenerated cellulose membrane, and achieve the effects of excellent dissolving ability, excellent mechanical properties and short dissolving time

Pending Publication Date: 2021-07-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the strength of the regenerated cellulose membrane obtained by the method of the prior art is not good enough. The present invention provides a regenerated cellulose membrane based on phosphoric acid solution and its preparation method

Method used

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  • Phosphoric acid solution-based regenerated cellulose membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0043] A kind of preparation method of the regenerated cellulose membrane based on phosphoric acid solution, concrete steps are as follows:

[0044] (1) First add the wood pulp to the phosphoric acid aqueous solution with a concentration of 81wt% and mix evenly, and leave it for 7 hours at -10°C to obtain a cellulose solution with a cellulose concentration of 8%; wherein the fiber in the cellulose solution The degree of polymerization of prime is 500;

[0045] (2) The cellulose solution prepared in step (1) was subjected to vacuum degassing for 20 min at room temperature to obtain a transparent cellulose solution;

[0046] (3) add chitin in the transparent cellulose solution that step (2) makes, and chitin is 6wt% of transparent cellulose solution, is then coated on the Teflon board and scraped into a film with a thickness of 250 μm, and then put the film into a coagulation bath at a temperature of 5°C for 5 minutes, and the gel film was pre-stretched by 10% to form a cellulo...

Embodiment 2

[0049] A kind of preparation method of the regenerated cellulose membrane based on phosphoric acid solution, concrete steps are as follows:

[0050] (1) earlier adding bamboo fiber to concentration is 85wt% in the phosphoric acid aqueous solution and mixes evenly, it is 15% cellulose solution that the concentration of cellulose is 15% to obtain the cellulose solution under-18 ℃ condition; Wherein the fiber in cellulose solution The degree of polymerization of prime is 1100;

[0051] (2) The cellulose solution prepared in step (1) was subjected to vacuum degassing for 20 min at room temperature to obtain a transparent cellulose solution;

[0052] (3) add silk fibroin in the transparent cellulose solution that step (2) makes, and silk fibroin is 2wt% of transparent cellulose solution, then through being coated on the Teflon mould, be flattened into thickness and be the 500 μ m film, then put the film into a coagulation bath at a temperature of 10°C for 10 minutes, and the gel f...

Embodiment 3

[0055] A kind of preparation method of the regenerated cellulose membrane based on phosphoric acid solution, concrete steps are as follows:

[0056] (1) First, the cotton pulp is added into the phosphoric acid aqueous solution with a concentration of 82wt% and mixed uniformly, and left to stand for 2.2 hours at -23°C to obtain a cellulose solution with a cellulose concentration of 8%; wherein the cellulose solution The degree of polymerization of cellulose is 800;

[0057] (2) The cellulose solution prepared in step (1) was subjected to vacuum degassing for 20 min at room temperature to obtain a transparent cellulose solution;

[0058] (3) add soybean protein in the transparent cellulose solution that step (2) makes, and soybean protein is 5wt% of transparent cellulose solution, is then coated on the PVDF board and scraped into a thickness of 600 μm film, then put the film into a coagulation bath at a temperature of 20°C for 5 minutes, and the gel film was pre-stretched by 20...

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Abstract

The invention relates to a phosphoric acid solution-based regenerated cellulose membrane and a preparation method thereof. The preparation method comprises the steps: adding cellulose with the polymerization degree ranging from 500 to 2000 into a phosphoric acid aqueous solution with the concentration ranging from 81 wt% to 85 wt% to be evenly mixed, placing a mixture for a period of time at the temperature ranging from -10 DEG C to -30 DEG C, and obtaining a cellulose solution with the concentration ranging from 5% to 15%; defoaming the cellulose solution to obtain a transparent cellulose solution; then coating a substrate with the transparent cellulose solution, slicking or calendering to form a gel film, putting the gel film into a coagulating bath, and pre-stretching the gel film to form a cellulose gel film; finally, removing residual phosphoric acid by using deionized water, and naturally drying to obtain the high-strength regenerated cellulose membrane. The tensile strength of the regenerated cellulose membrane is greater than 150Mpa. The method disclosed by the invention is simple and environment-friendly, and the prepared regenerated cellulose membrane has excellent mechanical property and high transparency, and has great potential in the application field of cellulose materials.

Description

technical field [0001] The invention belongs to the technical field of cellulose dissolution, and relates to a regenerated cellulose film based on a phosphoric acid solution and a preparation method thereof. Background technique [0002] With the development of science and technology in our country and the continuous improvement of people's living standards, the awareness of environmental protection is becoming stronger and stronger. People are gradually focusing on the development and utilization of sustainable development and environmentally friendly materials, especially the development of high-performance materials to meet the needs of life. Cellulose is the most abundant natural polymer compound in nature. Compared with other synthetic polymer materials, cellulose has the advantages of being completely biodegradable, non-toxic, and environmentally friendly, and its resources are inexhaustible. Thin films refer to soft and thin polymer material products. Mainly used in ...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08J3/05C08L1/02
CPCC08J5/18C08J3/05C08J2301/02
Inventor 隋晓锋王碧佳苏慧张玉梅毛志平冯雪凌张文娇王晓东
Owner DONGHUA UNIV
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