Chitosan-polyvinyl alcohol composite membrane and preparation method and application thereof
A technology of polyvinyl alcohol and chitosan, which is applied in sustainable manufacturing/processing, flexible covering, biological packaging, etc., can solve the problem that pure chitosan film cannot meet the performance, strength, brittleness and difficult processing of film products. question
Pending Publication Date: 2019-06-11
ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE
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Problems solved by technology
Chitosan is cast into a flexible transparent film, which has good adhesion, permeability and certain tensile strength, but the inventor found in the actual research process that because chitosan molecules are rigid molecules, resulting in Pure chitosan membrane has poor mechanical properties, high brittleness, and is not easy to process. Pure chitosan membrane cannot meet the needs of modern life and production for the performance and strength of membrane products.
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[0024] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.
[0025] In order to solve all or part of the deficiencies in the prior art, one purpose of the embodiments of the present invention is to provide a preparation method of chitosan-polyvinyl alcohol composite film, the preparation method comprising the following steps:
[0026] 1) Chitosan modification: Swell chitosan with water, then add acetic acid solution with a concentration of 1-6%, stir until completely dissolved, stand still, adjust the pH of the solution to 6.5-7, stand still for the second time, and then heat the solution to After 35-55°C, add the complex enzyme solution to shake the reaction, and finally deactivate the solution to obtain the modified chitosan emulsion;
[0027] 2) Film making: Take polyvinyl alcoh...
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The invention discloses a chitosan-polyvinyl alcohol composite membrane and a preparation method and application thereof, and relates to the technical field of polymer membrane materials. The chitosanis modified by the method of combining an acid and compound enzyme, the prepared modified chitosan emulsion has the moderate viscosity, then the modified chitosan emulsion and a PVA solution are subjected to mixing under a heating condition, and glycerol is added as a film-forming assistant agent, finally the chitosan-polyvinyl alcohol composite membrane is prepared by the combination of a blending method and a scraping-constant temperature and constant humidity drying method. The preparation method is simple. The chitosan-polyvinyl alcohol composite membrane has the biodegradability, and degradation products are pollution-free to the environment, and non-toxic and harmless, so that the composite membrane can be used as packaging membranes, and can be used in medicine to make disposable medical packaging supplies.
Description
technical field [0001] The invention relates to the technical field of polymer membrane materials, in particular to the technical field of composite membranes, in particular to a chitosan-polyvinyl alcohol composite membrane and its preparation method and application. Background technique [0002] The development of membrane technology has become a research hotspot in recent years. The development of membrane technology was created by AbbleNelkt in 1948 when the word Osmosis was used to describe the permeation of water through a semi-permeable membrane, and thus began the research on the membrane process. In the 1970s, my country successively developed membrane modules for electrodialysis, reverse osmosis, ultrafiltration and microfiltration, and entered the stage of popularization and application in the 1980s. Membrane separation technology is an emerging high-tech, which has been widely used in the industrial field in the past 30 years. And with the development of membra...
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Login to View More IPC IPC(8): C08L5/08C08L29/04C08K5/053C08J5/18C08B37/08B65D65/02C12P19/04
CPCY02W90/10
Inventor 闫红芹储长流汪辉张桂玉田野圣晓荣闫浦星田孝壮
Owner ANHUI UNIVERSITY OF TECHNOLOGY AND SCIENCE