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Chitosan zinc modified plastic used for beverage bottles and preparation method of modified plastic

A technology of chitosan zinc and beverage bottles, which is applied in the field of polymer materials, can solve the problems of toxic products and coupling agents, and achieve the effects of enhancing binding force, improving antibacterial performance, and improving affinity

Inactive Publication Date: 2019-06-11
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Adding filler materials to plastics in production is generally a blending method. Inorganic fillers need to be surface treated before being mixed with plastic substrates. Commonly used treatment methods include adding silane coupling agents, titanate coupling agents and aluminate coupling agents. The coupling agent enables a strong interaction between the filler and the plastic substrate, but the coupling agent is generally toxic or will react to produce toxic products during coupling

Method used

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  • Chitosan zinc modified plastic used for beverage bottles and preparation method of modified plastic
  • Chitosan zinc modified plastic used for beverage bottles and preparation method of modified plastic
  • Chitosan zinc modified plastic used for beverage bottles and preparation method of modified plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Preparation of Chitosan Zinc Modified Plastics for Beverage Bottles

[0038] raw material:

[0039]

[0040]

[0041] Preparation of Chitosan Zinc:

[0042] (1) 10 parts of chitosan and 5 parts of anhydrous zinc acetate were added to 85 parts of ethanol and stirred at 50° C. for 20 hours to obtain reaction system A;

[0043] (2) Filter the reaction system A, wash the obtained solid several times with a small amount of absolute ethanol, and dry to obtain chitosan zinc.

[0044] Preparation of modified chitosan zinc:

[0045] (1) Add 4 parts of carboxymethyl chitosan and 1 part of anhydrous zinc acetate to 95 parts of deionized water, stir for 20 minutes, then slowly add 0.1mol / L acetic acid within 5 minutes to adjust the pH value of the solution to 5.0 , to obtain reaction system B;

[0046] (2) Reaction system B was stirred and reacted in a constant temperature water bath at 35°C for 10 hours, added an equal volume of absolute ethanol and stood still for 12 ho...

Embodiment 2

[0050] Preparation of Chitosan Zinc Modified Plastics for Beverage Bottles

[0051] raw material:

[0052]

[0053] Preparation of Chitosan Zinc:

[0054] (1) 15 parts of chitosan and 2 parts of anhydrous zinc acetate were added to 95 parts of ethanol and stirred at 40°C for 30 hours to obtain reaction system A;

[0055] (2) Filter the reaction system A, wash the obtained solid several times with a small amount of absolute ethanol, and dry to obtain chitosan zinc.

[0056] Preparation of modified chitosan zinc:

[0057](1) Add 3 parts of carboxyethyl chitosan and 2 parts of anhydrous zinc acetate to 90 parts of deionized water, stir for 30 minutes, then slowly add 0.1mol / L acetic acid within 5 minutes to adjust the pH value of the solution to 4.0 , to obtain reaction system B;

[0058] (2) Reaction system B was stirred and reacted in a constant temperature water bath at 45°C for 3 hours, added an equal volume of absolute ethanol and stood still for 12 hours, filtered, a...

Embodiment 3

[0062] Preparation of Chitosan Zinc Modified Plastics for Beverage Bottles

[0063] raw material:

[0064]

[0065] Preparation of Chitosan Zinc:

[0066] (1) 12 parts of chitosan and 3 parts of anhydrous zinc acetate were added to 90 parts of ethanol and stirred at 45°C for 24 hours to obtain reaction system A;

[0067] (2) Filter the reaction system A, wash the obtained solid several times with a small amount of absolute ethanol, and dry to obtain chitosan zinc.

[0068] Preparation of modified chitosan zinc:

[0069] (1) Add 3.5 parts of carboxymethyl ethyl chitosan and 1.5 parts of anhydrous zinc acetate to 92 parts of deionized water, stir for 25 minutes, then slowly add 0.1mol / L acetic acid within 5 minutes to adjust the pH value of the solution To 4.5, obtain reaction system B;

[0070] (2) Reaction system B was stirred and reacted in a constant temperature water bath at 40°C for 7 hours, added an equal volume of absolute ethanol and stood still for 12 hours, fil...

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Abstract

The invention discloses a chitosan zinc modified plastic used for beverage bottles and a preparation method of the modified plastic. According to the modified plastic and method provided by the invention, amino and hydroxyl of three nucleophilic reactive functional groups of chitosan are subjected to chemical modification to introduce an antibacterial group, and at the same time, zinc ions are introduced to enhance the antibacterial property; food safety hazards generated because metal and metal oxide particles are easy to migrate into beverages when in contact with the beverages are avoided;the natural high-molecular chitosan which is used as a food additive and has food safety and zinc are combined for resisting bacteria and inhibiting growth and reproduction of fungi, bacteria and viruses in water; the method adopts zinc stearate and calcium stearate as surface modifiers, dispersants and lubricants of chitosan zinc and modified chitosan zinc, so that use of other plastic processingauxiliary agents harmful to human bodies can be reduced; and at the same time, zinc and calcium, as microelements that the human bodies have to replenish daily, are beneficial to human health.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a chitosan zinc modified plastic used for beverage bottles and a preparation method thereof. Background technique [0002] Beverages are easily infected by microorganisms such as bacteria, mold and yeast during processing and storage, resulting in deterioration. In order to make beverages have a longer shelf life, preservatives are generally added to inhibit microorganisms. In the beverage industry, organic preservatives such as benzoic acid and sorbic acid are commonly used in the preservation of beverages. Many metals and metal oxides have excellent antibacterial properties, such as silver, silver oxide, zinc, zinc oxide, copper, copper oxide, etc. For example, zinc oxide particles exhibit high antibacterial activity against microorganisms such as bacteria, molds, spores, and yeasts. At the same time, zinc, as a trace element that must be supplemented by the human...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L69/00C08L81/06C08L23/12C08L23/06C08L5/08C08K5/098C08K5/3475C08K5/07C08K9/04C08K3/38
Inventor 黄欣徐常威
Owner GUANGZHOU UNIVERSITY