Biodegradable antibacterial film and preparation method thereof

A biodegradable and film technology, applied in the field of biodegradable antibacterial film and its preparation, can solve the problems of great harm to the human body and the environment, poor crack resistance, and inability to completely degrade naturally.

Pending Publication Date: 2022-06-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common antibacterial plastic films on the market are mostly made of traditional petroleum-based plastics such as PVC, PP, PE, PS, etc., which are cheap and easy to process and produce on a large scale, but they cannot be completely degraded naturally. The antibacterial agents used such as quaternary ammonium salts and pyridines Most of the decomposition products such as , imidazoles, organic metals, etc. have certain toxicity and are potentially harmful to the human body and the environment.
The existing degradable films have problems such as difficult to control the degradation rate, poor crack resistance, residual film will pollute the soil, and destroy the structure of soil microbial flora.

Method used

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  • Biodegradable antibacterial film and preparation method thereof
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Examples

Experimental program
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preparation example Construction

[0025] A preparation method of a biodegradable antibacterial film, comprising the following steps:

[0026] Step 1: Preparation of PVA / CNC blend solution: Weigh 5g of PVA and add it to 100ml of deionized water. The stirring speed of the water bath at 95°C is 900rpm, and stirring and swelling for 1h to obtain a PVA aqueous solution with a concentration of 5% (m / v); continue stirring and cooling To room temperature, add the CNC suspension with a mass fraction of 1 to 7% to the PVA mother solution, drop 1 to 2 ml of a 2.5% mass fraction of glutaraldehyde aqueous solution and 1 ml of glycerol, and stir and disperse at 700 rpm for 1 hour to obtain a PVA / CNC blend solution. .

[0027] Step 2: Preparation of PVA / CNC / antibacterial agent composite film: add 0.08-0.4 g of tea polyphenol powder to the solution described in step 1, stir and disperse at room temperature for 30 minutes, and stir and disperse at a stirring speed of 700 rpm for 30 minutes to prepare a casting liquid , stand ...

Embodiment 1

[0032] Example 1: Agricultural mulch film

[0033] Step 1: Preparation of polyvinyl alcohol PVA solution: Weigh 5 g of polyvinyl alcohol PVA and add it to 100 ml of deionized water. The stirring speed of the water bath at 95 ° C is 700 rpm, stirring and swelling for 1 h, and stirring is continued to cool to room temperature to obtain a concentration of 5% (m / v) An aqueous solution of polyvinyl alcohol PVA.

[0034] Step 2: Preparation of polyvinyl alcohol PVA / nanocellulose crystal CNC blend: 3.43 g of the nanocellulose crystal CNC suspension with a mass fraction of 7 wt% was added to the polyvinyl alcohol PVA mother solution, and 1 ml of 2.5% mass fraction was added dropwise. The aqueous solution of glutaraldehyde and 1 ml of glycerol were stirred and dispersed at 700 rpm for 30 min to obtain a polyvinyl alcohol PVA / nanocellulose crystal CNC blended solution.

[0035] Step 3: Preparation of polyvinyl alcohol PVA / nanocellulose crystal CNC / tea polyphenol TP composite film: add...

Embodiment 2

[0037] Example 2: Antibacterial Packaging Film

[0038] Step 1: Preparation of polyvinyl alcohol PVA solution: Weigh 5 g of polyvinyl alcohol PVA and add it to 100 ml of deionized water. The stirring speed of the water bath at 95 ° C is 700 rpm, stirring and swelling for 1 h, and stirring is continued to cool to room temperature to obtain a concentration of 5% (m / v) An aqueous solution of polyvinyl alcohol PVA.

[0039] Step 2: Preparation of polyvinyl alcohol PVA / nanocellulose crystal CNC blend: 1.1 g of the nanocellulose crystal CNC suspension with a mass fraction of 7 wt% was added to the polyvinyl alcohol PVA mother solution, and 2 ml of 2.5% mass fraction was added dropwise. The aqueous solution of glutaraldehyde and 1 ml of glycerol were stirred and dispersed at 700 rpm for 30 min to obtain a polyvinyl alcohol PVA / nanocellulose crystal CNC blended solution.

[0040] Step 3: Preparation of polyvinyl alcohol PVA / nanocellulose crystal CNC / tea polyphenol TP composite film:...

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PUM

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Abstract

The invention discloses a biodegradable antibacterial film and a preparation method thereof, and belongs to the field of biodegradable antibacterial film preparation, polyvinyl alcohol, nano cellulose crystal and tea polyphenol are used as main film preparation materials, glycerol is used as a plasticizing modifier, glutaraldehyde is used as a cross-linking agent, and the biodegradable antibacterial film is prepared by a one-step method. The biodegradable antibacterial film is prepared by adopting a solution tape casting method. The prepared film has good mechanical properties, water resistance, light transmittance, moisturizing performance, antibacterial performance and full-biodegradation performance, and solves the problems that antibacterial films on the market are slow in degradation rate and cannot be completely degraded, and the problems that environmental pollution is caused in the degradation process of synthetic antibacterial agents and the like.

Description

technical field [0001] The invention belongs to the technical field of antibacterial film preparation, in particular to a biodegradable antibacterial film and a preparation method thereof. Background technique [0002] With the increasing production level, people's requirements for antibacterial materials are no longer limited to excellent antibacterial properties, but also to meet environmental friendliness. At this stage, it is clearly proposed to promote the use of non-plastic products and degradable shopping bags and packaging films (bags), and to promote degradable plastic films on a large scale in combination with agronomic measures. At present, the common antibacterial plastic films on the market are mostly made from traditional petroleum-based plastics such as PVC, PP, PE, PS, etc., which are low in cost and easy to be processed and produced on a large scale, but cannot be completely degraded naturally. Antibacterial agents such as quaternary ammonium salts, pyridine...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08L1/02C08K5/1545C08K5/07C08J5/18
CPCC08J5/18C08J2329/04C08J2401/02C08K5/1545C08K5/07
Inventor 李慧田家瑶庞姗姗王云云薛志飞龚国利
Owner SHAANXI UNIV OF SCI & TECH
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