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A kind of polyvinyl alcohol composite fresh-keeping film of anti-expansion bag and its preparation method and application

A polyvinyl alcohol and composite fresh-keeping technology, which is applied in the field of fresh-keeping film preparation, can solve problems such as bulging easily, and achieve the effects of preventing bulging, prolonging the permeation path, and accelerating internal and external exchange.

Active Publication Date: 2022-07-19
GUIZHOU MATERIAL IND TECH INSTITUE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the problem that PVA used in the above and / or in the prior art is prone to swelling when used in fruit and vegetable packaging with low barrier requirements, the present invention is proposed

Method used

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  • A kind of polyvinyl alcohol composite fresh-keeping film of anti-expansion bag and its preparation method and application
  • A kind of polyvinyl alcohol composite fresh-keeping film of anti-expansion bag and its preparation method and application
  • A kind of polyvinyl alcohol composite fresh-keeping film of anti-expansion bag and its preparation method and application

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preparation example Construction

[0034] In view of the problem that in the prior art, PVA is used for the packaging of fruits and vegetables with low barrier property requirements and is prone to swelling, the present invention provides a polyvinyl alcohol composite fresh-keeping film for anti-swelling bags and a preparation method thereof, so as to solve the problem of existing products. existing technical problems.

[0035] Specifically, the present invention uses PVA as the base material, and by introducing inorganic mesoporous silica nanoparticles and using synergistic antibacterial agents, a PVA composite fresh-keeping film with modified atmosphere and antibacterial functions is prepared. The preparation method can be referred to as follows:

[0036] (1) Preparation of mesoporous silica: add cetyltrimethylammonium bromide (CTAB) to deionized water, add sodium hydroxide (NaOH) to adjust pH; add 1,3,5-trimethylbenzene (TMB), stirring and dissolving, then adding ethyl orthosilicate (TEOS), heating up and co...

Embodiment 1

[0056] (1) Add 0.2g CTAB to 100mL deionized water, stir and dissolve at 800r / min, add NaOH to adjust pH=9.5, continue stirring at 80°C for 15min, then adjust the speed to 1600r / min, add 0.07mL TMB, stir for 30min Then 2 mL of TEOS was slowly added dropwise, and after stirring for 24 h, suction filtration, repeated washing with deionized water and absolute ethanol, and vacuum drying for 24 h were to obtain silicon oxide powder; the obtained sample was added to a mixture of 90 mL of absolute ethanol and 10 mL of hydrochloric acid. In the liquid, the temperature was raised to 90 °C and refluxed twice, and then filtered, washed and dried to obtain mesoporous silica;

[0057] (2) Add 0.6 g of mesoporous silica to 100 mL of deionized water, stir and disperse at room temperature for 30 min, then add 10 g of PVA (Model 117), raise the temperature to 80 °C and mechanically stir for 2 h, let stand overnight and scrape the film, and place at 50 °C. The PVA composite plastic wrap was obta...

Embodiment 2

[0067] The present embodiment 2 is basically the same as the embodiment 1, the difference is that an antibacterial agent is added in the step (2), and the specific method is:

[0068] (2) Add 0.6g of mesoporous silica to 100mL of deionized water, stir and disperse at room temperature for 30min, then add 10g of PVA (Model 117), heat up to 80°C and stir mechanically for 2h, add 0.06g of antibacterial agent, and continue to stir for 1h After standing overnight, the film was scraped, and dried at 50°C to obtain a PVA composite plastic wrap.

[0069] The added antibacterial agent types are shown in Table 2, the physical property indexes of the obtained PVA composite fresh-keeping film are measured and the fresh-keeping effect is tested, and the test results are shown in Table 2.

[0070] Table 2

[0071]

[0072] As can be seen from the data in Table 2, after adding the antibacterial agent, the fresh-keeping period of the blueberry is extended, and there is no obvious swelling ...

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Abstract

The invention discloses a polyvinyl alcohol composite fresh-keeping film for an anti-expansion bag and a preparation method and application thereof. The polyvinyl alcohol composite fresh-keeping film for an anti-expansion bag comprises PVA, mesoporous silica and deionized water; In parts by mass, PVA is 5-12 parts, mesoporous silica is 0.3-1 part, and deionized water is 100 parts. The present invention can adsorb ethylene and CO to a certain extent through the composite of mesoporous silica 2 The introduced pore structure can also help the gas to be discharged, effectively preventing the occurrence of PVA swelling, prolonging the fresh-keeping period of fruits and vegetables, and expanding the application of PVA in the packaging field.

Description

technical field [0001] The invention belongs to the technical field of fresh-keeping film preparation, and in particular relates to a polyvinyl alcohol composite fresh-keeping film of an anti-expansion bag and a preparation method and application thereof. Background technique [0002] The nutrients of fruits and vegetables can provide good conditions for the reproduction of microorganisms. When the microorganisms are in the environment of suitable nutrients, oxygen, moisture, etc., they will multiply and grow in large quantities, releasing carbon dioxide. Once the generated gas cannot be discharged, the food itself If the sterilization is not complete or the packaging materials do not meet the requirements, the phenomenon of bulging will occur. [0003] Polyvinyl alcohol (PVA) has good moisture permeability, gas barrier properties and aroma retention. Its high barrier properties can prevent the interpenetration between the gas generated by the respiration of fruits and veget...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L29/04C08K7/26C08J5/18
CPCC08J5/18C08J2329/04C08K7/26
Inventor 张黎庞会霞罗珊珊李娟高成涛王彦文黄绍文胡继粗秦舒浩
Owner GUIZHOU MATERIAL IND TECH INSTITUE
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