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Preparation method of antibacterial PE (polyethylene) film

An antibacterial agent and antibacterial masterbatch technology, which is applied in the field of antibacterial PE film preparation, can solve the problems of inorganic antibacterial agents such as weak antibacterial performance, poor safety performance, and long antibacterial time, so as to prolong the shelf life of food and inhibit bacteria and spores , the effect of enhancing the effect

Inactive Publication Date: 2019-05-21
桐城市祥泰塑业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because inorganic antibacterial agents have a long antibacterial effect and high temperature resistance, they can adapt to plastic processing and are widely used in antibacterial plastics. However, inorganic antibacterial agents are not strong in antibacterial properties, poor in water solubility, and have a low range of action. Their safety performance is far inferior to natural series. antibacterial agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] S1 mixed culture solution: the mass percentage is 89.432% culture liquid, the mass percentage is 0.9% peptone, the mass percentage is 2% yeast essence, the mass percentage is 0.018% magnesium sulfate, the mass percentage is 3.6% sucrose, the mass percentage Potassium dihydrogen phosphate with a percentage of 1.8%, sodium chloride with a percentage of 1.8% by mass, and corn steep liquor with a percentage of 2.25% by mass are mixed to form a fermentation medium, so that the initial pH of the fermentation medium is 7.5, and the culture temperature is 30 degrees, with slight stirring , so that its control pH is 6.2, and it is added to the reaction tank when the pH rises;

[0028] S2 Bubble blowing: adjust the pH value of the fermented liquid in the reaction tank to 2.5, remove the bacteria by membrane or centrifugation, then place the supernatant in a closed container, and pass sterile air at the bottom to make the fermented liquid in the fermented liquid The protein overfl...

Embodiment 2

[0037] S1 mixed culture solution: the mass percentage is 89.432% culture liquid, the mass percentage is 0.9% peptone, the mass percentage is 2% yeast essence, the mass percentage is 0.018% magnesium sulfate, the mass percentage is 3.6% sucrose, the mass percentage Potassium dihydrogen phosphate with a percentage of 1.8%, sodium chloride with a percentage of 1.8% by mass, and corn steep liquor with a percentage of 2.25% by mass are mixed to form a fermentation medium, so that the initial pH of the fermentation medium is 7.5, and the culture temperature is 30 degrees, with slight stirring , so that its control pH is 6.2, and it is added to the reaction tank when the pH rises;

[0038] S2 Bubble blowing: adjust the pH value of the fermented liquid in the reaction tank to 2.5, remove the bacteria by membrane or centrifugation, then place the supernatant in a closed container, and pass sterile air at the bottom to make the fermented liquid in the fermented liquid The protein overfl...

Embodiment 3

[0047] S1 mixed culture solution: the mass percentage is 89.432% culture liquid, the mass percentage is 0.9% peptone, the mass percentage is 2% yeast essence, the mass percentage is 0.018% magnesium sulfate, the mass percentage is 3.6% sucrose, the mass percentage Potassium dihydrogen phosphate with a percentage of 1.8%, sodium chloride with a percentage of 1.8% by mass, and corn steep liquor with a percentage of 2.25% by mass are mixed to form a fermentation medium, so that the initial pH of the fermentation medium is 7.5, and the culture temperature is 30 degrees, with slight stirring , so that its control pH is 6.2, and it is added to the reaction tank when the pH rises;

[0048] S2 Bubble blowing: adjust the pH value of the fermented liquid in the reaction tank to 2.5, remove the bacteria by membrane or centrifugation, then place the supernatant in a closed container, and pass sterile air at the bottom to make the fermented liquid in the fermented liquid The protein overfl...

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Abstract

The invention provides a preparation method of antibacterial PE (polyethylene) film. PE antibacterial masterbatches are provided; the PE antibacterial masterbatches comprise polyethylene, an antibacterial agent and a chelating agent; the antibacterial agent is a natural antibacterial agent nisin; the chelating agent is ethylene diamine tetraacetic acid; and the antibacterial agent is produced by afermentation cultivation method in a culture medium and is prepared by the following steps: S1, mixing culture liquid; S2, blowing bubbles; S3, salting out; S4, cleaning a light-transmitting sheet; S5, discharging clear liquid; S6, preparing concentrated liquid; S7, obtaining the nisin; S8, preparing masterbatches; and S9, preparing finished products. The natural antibacterial agent nisin and theethylene diamine tetraacetic acid chelating agent are added, so that the PE film effectively has antibacterial effect; and the nisin is lactococcus lactis, so bacteria and spores causing food spoilage are effectively inhibited, the shelf life of food is prolonged, the sterilization temperature is reduced, the sterilization time is shortened, the food quality is improved, energy consumption is reduced, chemical preservative is substituted or partially substituted, and the requirement of producing healthy food is met.

Description

technical field [0001] The invention relates to the technical field of PE film manufacture, in particular to a preparation method of an antibacterial PE film. Background technique [0002] PE film is a film made of polyethylene material, and polyethylene (PE) has high molecular weight, low degree of branching, excellent mechanical properties, excellent electrical insulation properties, low temperature resistance, easy processing and molding, and excellent chemical stability. Advantages, it has been widely used in the fields of industry, agriculture, construction and national defense, and products such as films, pipes, wires, cables, home appliances, plastic products, packaging materials and auto parts. With the development of petrochemical industry, the production of polyethylene has developed rapidly. The output accounts for about 1 / 4 of the total output of plastics, and the consumption is also the first 1-3 of all synthetic resins. In recent years, with the increase of po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L23/06C08K5/372C08K5/17
Inventor 李学跃李旭
Owner 桐城市祥泰塑业有限公司
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