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Titanium-dioxide-doped bentonite/PVA (polyvinyl alcohol) bactericidal preservative film and preparation method thereof

The technology of titanium dioxide and nano-titanium dioxide is applied in the field of bentonite/PVA sterilization and fresh-keeping film and its preparation.

Inactive Publication Date: 2017-05-10
杜克玲
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In his master's degree thesis "Preparation of Bentonite / PVA Preservative Film and Its Application in Mango Preservation", Huang Huirong prepared a kind of preservative film by using bentonite and polyvinyl alcohol, but it has no bactericidal effect. Dispersion in vinyl alcohol needs to be improved

Method used

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Embodiment

[0021] A titanium dioxide-doped bentonite / PVA bactericidal preservation film is characterized in that it is made of the following raw materials in parts by weight:

[0022] Nano titanium dioxide 4, garlic paste 30, polyvinyl alcohol 60, acrylic resin emulsion 40, ferrous chloride 2, sucrose 3, pyridoxal phosphate 0.5, bentonite 25, β-cyclodextrin 40, sodium dodecylsulfonate 5 , glycerin 3, deionized water 1000, absolute ethanol 600;

[0023] The solid content of the acrylic resin emulsion is 10-20%.

[0024] The preparation method of described a kind of titanium dioxide-doped bentonite / PVA bactericidal preservative film is characterized in that it is made by the following steps:

[0025] a. Disperse minced garlic in 80-100 parts of deionized water, add ferrous chloride, sucrose, pyridoxal phosphate, enzymatically hydrolyze for 50-70 minutes at a temperature of 30-40°C and a pH of 6-7, then add 80-100 parts of absolute ethanol, ultrasonically extracted for 40-60 minutes to ob...

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Abstract

The invention discloses a titanium-dioxide-doped bentonite / PVA (polyvinyl alcohol) bactericidal preservative film and a preparation method thereof. The invention is characterized in that the preservative film is prepared from the following raw materials in parts by weight: 2-4 parts of nano titanium dioxide, 20-30 parts of garlic spread, 50-60 parts of polyvinyl alcohol, 30-40 parts of acrylic resin emulsion, 1-2 parts of ferrous chloride, 2-3 parts of sucrose, 0.2-0.5 part of phosphopyridoxal, 15-25 parts of bentonite, 30-40 parts of beta-cyclodextrin, 2-5 parts of sodium dodecylsulfate, 2-3 parts of glycerol, 600-1000 parts of deionized water and 100-600 parts of anhydrous ethanol. The garlic oil is carried by the bentonite and included by the cyclodextrin, thereby solving the problem of pungent odor in organic sulfides, performing the slow-release function, prolonging the bactericidal life, enhancing the dispersity of the bentonite in the polyvinyl alcohol substrate, and enhancing the water resistance of the preservative film. The added nano titanium dioxide is matched to enhance the hydrophobicity of the preservative film.

Description

technical field [0001] The invention relates to a preservative film and a preparation method thereof, in particular to a titanium dioxide-doped bentonite / PVA sterilizing preservative film and a preparation method thereof. Background technique [0002] Fresh-keeping film plays an important role in the storage and preservation of fruits and vegetables. Different fruits and vegetables have different requirements on the air permeability and moisture permeability of the fresh-keeping film due to their different water content and respiratory strength. And other problems, because PVA macromolecule contains a large number of light groups, has extremely strong hydrophilicity, makes the water absorption rate of PVA film very high, has affected the application of PVA film on the food preservation on the contrary. Studies have shown that the small size effect and macroscopic quantum dangerous channel effect of nanoparticles can interact with the unsaturated bonds of polymer resins, whic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L33/00C08L91/00C08K13/06C08K9/10C08K9/08C08K3/34C08K3/22C08K5/36
CPCC08J5/18C08J2329/04C08J2433/00C08K2201/011C08L29/04C08L2203/16C08L2205/03C08L33/00C08L91/00C08K13/06C08K9/10C08K9/08C08K3/346C08K2003/2241C08K5/36
Inventor 杜克玲
Owner 杜克玲