Antibacterial biodegradable water absorbing material used for refrigerated foods and preparation method thereof

Abstract

The invention belongs to the field of food packaging and particularly relates to an antibacterial biodegradable water absorbing material used for refrigerated foods. The material is composed of, by weight, 30-40% of chitosan, 10-15% of NaOH, 10-20% of acrylic acid, 0.1-0.5% of potassium persulfate, 0.5-1.0% of N,N'-methylene bisacrylamide, 30-45% of tea leaves and 5-10% of glycerin. The tea leavesare processed into freeze-dried powder and are blend with the chitosan water-absorbing resin and glycerin to make the product. In the invention, with the chitosan and tea leaves being the water absorbing material, the water absorbing material has biodegradability and can inhibit growth of microorganisms in the field of fresh-keeping of the refrigerated foods. The material can be used as an environment-friendly material for application in the field of fresh keeping of foods.

Description

technical field [0001] The invention belongs to the field of food packaging materials, and in particular relates to a bacteriostatic biodegradable water-absorbing material applied to refrigerated food and a preparation method thereof. Background technique [0002] Nowadays, super absorbent material is a functional polymer material containing strong hydrophilic groups such as carboxyl groups and hydroxyl groups and has a certain degree of crosslinking. It is insoluble in water but has high water absorption and water retention capabilities, and has been widely used. In the fields of medicine and health, agriculture and horticulture, petrochemical industry, civil engineering and construction, about 90% of the water-absorbing materials are used for disposable products, but the problem that comes with it is that some mainstream water-absorbing materials on the market such as acrylic The poor biodegradability of polymers poses a great threat to the ecological environment, so there...

AI Technical Summary

Problems solved by technology

[0002] Nowadays, super absorbent material is a functional polymer material containing strong hydrophilic groups such as carboxyl groups and hydroxyl groups and has a certain degree of crosslinking. It is insoluble in water but has high water absorption and water retention capabilities, and has been widely used. In the fields of medicine and health, agriculture and horticulture, petrochemical industry, civil engineering and construction, about 90% of the water-absorbing materials are used for disposable products, but the problem that comes with it is that some mainstream water-absorbing materials on the market such as acrylic The poor biodegradability of polymers poses a great threat to the ecological environment, so there is a hidden danger of environmental pollution caused by super absorbent materials after being discarded in large quantities

Secondly, most of the water-absorbing materials used in fresh-keeping, such as frozen meat products, will continue to bleed in the process of selling in supermarkets, which will easily lead to the growth of bacteria and other microorganisms and affect the quality of food. Therefore, with the domestic and foreign frozen food preservation market The gradual maturity of the world and the increasing call for biodegradable materials in the world, adding an antibacterial and biodegradable water-absorbing material to the use of fresh-keeping materials to meet the needs of domestic and foreign markets is an urgent problem to be solved at present. one

[0003] At present, although many water-absorbing materials have strong water absorption, they cannot be biodegraded, and they are easy to promote the growth of microorganisms, such as water-absorbing materials made of starch-based materials.

These shortcomings limit the development of water-absorbent materials in the cold storage and fresh-keeping food industry

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