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Preparation method for cellulose/chitosan composite modified degradable antibacterial membrane

A compound modification, chitosan technology, applied in the direction of flexible covering, climate sustainability, sustainable packaging industry, etc., can solve the problems of polluting the environment, white garbage, etc., to achieve the effect of no pollution to the environment and solve waste.

Inactive Publication Date: 2016-03-16
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention: Aiming at the disadvantages that most of the current antibacterial packaging films are non-degradable plastic products, resulting in white garbage and polluting the environment, a kind of wheat straw and shrimp shells are provided as raw materials, and the wheat straw is first cleaned and exposed to the sun. After pulverization, add sodium hydroxide solution for cooking, enzymolysis reaction with cellulose hydrolase, then add sulfuric acid and hydrochloric acid to heat up hydrolysis in the reaction kettle, ultrasonic treatment, filtration, drying and pulverization to obtain modified cellulose; then wash, dry and grind the shrimp shells Grind into powder, soak in hydrochloric acid, heat in a liquid alkali water bath, suction filter to obtain a filter cake that is dried and crushed, add a mixed solution of modified cellulose and glacial acetic acid, undergo ultrasonic treatment, and sterilize with an ultraviolet lamp to form a film forming machine. Method for preparing cellulose / chitosan composite modified degradable antibacterial film by film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019]First, take 1kg of wheat straw, put the wheat straw into clean water for 30 minutes according to the solid-liquid ratio of 1:1, rinse it once with water, take it out and expose it to the sun for 24 hours, so that the water content is 5%, stop the exposure , put it into a pulverizer and pulverize it into straw fibers with a length of 2 cm; then put the straw fibers prepared above into a water bath, add 30 mL of sodium hydroxide solution to it, and heat up to 120 °C at a speed of 5 °C / min. Cook for 50 minutes. After cooking, use an iron spoon to turn over from the bottom of the pot 5 times, and continue to keep warm for 1 hour. After the second cooking is completed, take it out and add water with a mass ratio of 1:1 to the straw and soak for 2 hours; after the above soaking is completed , sieved and put into a container, respectively adding 10% cellulolytic enzyme and 5% 0.62mol / L potassium acetate solution, at a temperature of 50°C and a rotating speed of 500r / min, magneti...

example 2

[0022] First, take 2kg of wheat straw, put the wheat straw into clear water for 35 minutes according to the solid-liquid ratio of 1:1, rinse it twice with water, take it out and expose it to the sun for 27 hours, so that the water content reaches 6%, stop the exposure , put it into a pulverizer and crush it into straw fibers with a length of 3 cm; then put the above-mentioned straw fibers into a water bath, add 40 mL of sodium hydroxide solution to it, and heat up to 125 ° C at a speed of 5 ° C / min. Cook for 55 minutes. After cooking, use an iron spoon to turn over from the bottom of the pot 6 times, and continue to keep warm for 1.5 hours. After the second cooking is completed, take out and add water with a mass ratio of 1:1 to the straw and soak for 3 hours; wait for the above soaking to be completed. Finally, sieve and put it into a container, add 15% cellulolytic enzyme and 8% 0.62mol / L potassium acetate solution to it respectively, at a temperature of 55°C and a rotating...

example 3

[0025] Firstly, take 3kg of wheat straw, put the wheat straw into clean water for 40 minutes according to the solid-liquid ratio of 1:1, rinse it twice with water, take it out and expose it to the sun for 30 hours, so that the water content reaches 7%, stop the exposure , put it into a pulverizer and pulverize it into straw fibers with a length of 4 cm; then put the above-mentioned straw fibers into a water bath, add 50 mL of sodium hydroxide solution to it, and heat up to 130 °C at a speed of 5 °C / min. Cook for 60 minutes. After cooking, use an iron spoon to turn over from the bottom of the pot 6 times, and continue to keep warm for 2 hours. After the second cooking is completed, take it out and add water with a mass ratio of 1:1 to the straw and soak for 4 hours; after the above soaking is completed , sieved and put into a container, respectively adding 20% ​​cellulolytic enzyme and 10% 0.62mol / L potassium acetate solution, at a temperature of 60°C and a rotating speed of 700...

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Abstract

The invention discloses a preparation method for a cellulose / chitosan composite modified degradable antibacterial membrane, belonging to the technical field of preparation of antibacterial membranes. The preparation method comprises the following steps: with wheat straw and shrimp shell as raw materials, subjecting the wheat straw to cleaning, solarization and crushing, adding a sodium hydroxide solution, cooking the crushed wheat straw with the sodium hydroxide solution, then subjecting the cooked wheat straw and cellulose hydrolase to an enzymatic hydrolysis reaction, adding sulfuric acid and hydrochloric acid into a reaction vessel, carrying out heating and hydrolysis and then successively carrying out ultrasonic treatment, filtering, drying and crushing so as to obtain modified cellulose; and subjecting the shrimp shells to cleaning, drying and milling into powder, soaking the obtained shrimp shell powder with hydrochloric acid, adding liquid alkali and carrying out water-bath heating, then carrying out pumping filtration so as to obtain a filter cake, drying and crushing the filter cake, adding a mixed solution of modified cellulose and glacial acetate acid, then carrying out ultrasonic treatment and ultraviolet lamp sterilization and finally, forming the membrane in a membrane forming machine. The invention has the following beneficial effects: the degradable antibacterial membrane is prepared through compounding and modification of the wheat straw and shrimp shells, so waste of resources is prevented; and the prepared degradable antibacterial membrane is safe, environment-friendly, naturally degradable and pollution-free to the environment.

Description

technical field [0001] The invention relates to a preparation method of a cellulose / chitosan composite modified degradable antibacterial film, belonging to the technical field of antibacterial film preparation. Background technique [0002] Antibacterial film refers to chemical substances that can keep the growth or reproduction of certain microorganisms (bacteria, fungi, yeast, algae, viruses, etc.) below the necessary level within a certain period of time. Antibacterial film is a substance or product with antibacterial and bactericidal properties. With the improvement of living standards, people pay more and more attention to their own health and have stricter requirements on food. The surface of the packaging film for packaging dairy products, fruits and vegetables, meat and other nutritious items is rich in nutrients, and the general storage temperature, humidity and other conditions are also more suitable for the growth of microorganisms. Items rot. The use of antiba...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/04C08L5/08C08J5/18C08B37/08C12P19/14B65D65/46
CPCB65D65/46C08B37/0003C08B37/003C08J5/18C08J2301/04C08J2305/08C08J2401/04C08J2405/08C08L1/04C08L5/08C08L2201/06C08L2203/16C12P19/14Y02A40/90Y02W90/10
Inventor 黄勇薛红娟
Owner CHANGZHOU UNIV
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