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Fresh-keeping film containing aerogel and preparation method thereof

A technology of fresh-keeping film and airgel, which is applied in the field of airgel-containing fresh-keeping film and its preparation, which can solve the problems that the fresh-keeping film cannot meet the requirements, the anti-mildew effect is not obvious, and the air and moisture permeability is poor, so as to achieve the antibacterial effect Remarkably, the effect of reducing stress concentration points and improving moisture permeability

Inactive Publication Date: 2019-01-01
BENGBU WEIGUANG PLASTIC PRODS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the different fresh-keeping requirements of various fruits and vegetables, a single-function fresh-keeping film cannot meet the requirements
[0003] Mango is a climacteric, ethylene-sensitive, and cold-sensitive fruit. It is produced in hot and rainy tropical areas. It will quickly ripen and rot after being picked, so it needs to be kept fresh in time. Wetness is poor, anti-mildew effect is not obvious, etc.

Method used

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  • Fresh-keeping film containing aerogel and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] An aerogel-containing plastic wrap is characterized in that it is made from the following raw materials in parts by weight:

[0020] Nano silver 4, tetraethyl orthosilicate solution 30, acetonitrile 5, oxalic acid solution 10, neopentyl glycol 5, PVA aqueous solution 50, glutaraldehyde 5, hydrochloric acid solution 3.

[0021] Further, its preparation method comprises the following steps:

[0022] (1) Put the nano-silver in the Erlenmeyer flask, add ethanol, then seal it, sonicate it in an ultrasonic water bath at 60°C for 30min, then filter and dry it at 90°C, then place the obtained nano-silver in a ball mill jar Grinding, and adding acetic acid, after grinding for 10 minutes, air-dry naturally;

[0023] (2) Add the product obtained in step (1) into tetraethyl orthosilicate solution, stir at 800rpm for 3min to form a uniform dispersion, then add acetonitrile and oxalic acid solution, stir at 400rpm for 10min, React for 3 hours, add acetonitrile, place at room temper...

Embodiment 2

[0030] An aerogel-containing plastic wrap is characterized in that it is made from the following raw materials in parts by weight:

[0031] Nano silver 5, tetraethyl orthosilicate solution 35, acetonitrile 7, oxalic acid solution 15, neopentyl glycol 6, PVA aqueous solution 60, glutaraldehyde 8, hydrochloric acid solution 4.

[0032] Further, its preparation method comprises the following steps:

[0033] (1) Put the nano-silver in the Erlenmeyer flask, add ethanol, then seal it, sonicate it in an ultrasonic water bath at 62°C for 35 minutes, then filter and dry it at 92°C, and then place the obtained nano-silver in a ball mill jar Grinding, and adding acetic acid, after grinding for 13 minutes, air-dried naturally;

[0034] (2) Add the product obtained in step (1) into tetraethyl orthosilicate solution, stir at 900rpm for 4min to form a uniform dispersion, then add acetonitrile and oxalic acid solution, stir at 450rpm for 12min, and then React for 4 hours, add acetonitrile, ...

Embodiment 3

[0041] An aerogel-containing plastic wrap is characterized in that it is made from the following raw materials in parts by weight:

[0042] Nano silver 6, tetraethyl orthosilicate solution 40, acetonitrile 10, oxalic acid solution 20, neopentyl glycol 10, PVA aqueous solution 80, glutaraldehyde 10, hydrochloric acid solution 5.

[0043] Further, its preparation method comprises the following steps:

[0044] (1) Put the nano-silver in the Erlenmeyer flask, add ethanol, then seal it, sonicate it in an ultrasonic water bath at 65°C for 40min, then filter and dry it at 95°C, and then place the obtained nano-silver in a ball mill jar Grinding, and adding acetic acid, after grinding for 15 minutes, air-dried naturally;

[0045] (2) Add the product obtained in step (1) to tetraethyl orthosilicate solution, stir at 1000rpm for 5min to form a uniform dispersion, then add acetonitrile and oxalic acid solution, stir at 500rpm for 15min, React for 5 hours, add acetonitrile, place at roo...

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Abstract

The invention discloses a fresh-keeping film containing aerogel and a preparation method thereof. The prepared fresh-keeping film has relatively high tensile strength and relatively good mechanical properties; meanwhile, the moisture permeability and the light transmittance are relatively high; the inhibition rate of colletotrichum gloeosporioides for causing a mango anthracnose disease reaches about 96 percent and the bacterium-inhibition effect is remarkable. According to the fresh-keeping film, nano-silver is treated by utilizing acetic acid, and the dispersity of the nano-silver in tetraethyl orthosilicate is improved, so that a stress concentration point is reduced and the mechanical properties of the fresh-keeping film are improved; one layer of the aerogel is formed on the surface of the nano-silver by utilizing tetraethyl orthosilicate, so that the moisture permeability of the fresh-keeping film is improved; an aerogel layer and the nano-silver have a cooperative effect to realize the effects of adsorbing and inhibiting the colletotrichum gloeosporioides, and the bacterium-inhibition rate is improved; neopentyl glycol is used for further treating silicon dioxide aerogel modified nano-silver and a crosslinking point can be formed by compound particles; the crosslinking point and a polyvinyl alcohol substrate can be subjected to crosslinking reaction to form a uniform crosslinking network, so that the mechanical properties of the fresh-keeping film are greatly improved.

Description

technical field [0001] The invention belongs to the technical field of plastic wrap, in particular to an airgel-containing plastic wrap and a preparation method thereof. Background technique [0002] At present, the storage and preservation methods of fruits and vegetables mainly include low-temperature refrigeration, controlled atmosphere, irradiation, chemical sterilization and plastic wrap packaging. Among them, the fresh-keeping film method is widely used due to its low cost, simple operation, wide application range and obvious effect. The plastic wraps used mainly include ordinary plastic wrap, microporous plastic wrap, anti-fog functional plastic wrap, edible plastic wrap and antibacterial plastic wrap. Due to the different fresh-keeping requirements of various fruits and vegetables, a single-function fresh-keeping film cannot meet the requirements. [0003] Mango is a climacteric, ethylene-sensitive, and cold-sensitive fruit. It is produced in hot and rainy tropical...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K9/04C08K7/26C08K3/08C08J5/18
CPCC08J5/18C08J2329/04C08K7/26C08K9/04C08K2003/0806C08K2201/011
Inventor 李维光杨永志
Owner BENGBU WEIGUANG PLASTIC PRODS
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