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Curcumin modified layered clay/polyvinyl alcohol nano composite film and preparation method thereof

A polyvinyl alcohol and nano-composite technology, applied in the field of packaging materials, can solve the problems of lack of flame retardancy, antibacterial and ultraviolet resistance, unsatisfactory flame retardancy and antibacterial performance, and limited applications. It is not easy to achieve Shedding and separation, improving mechanical properties and thermal stability, and extending the shelf life

Active Publication Date: 2021-10-08
XIAMEN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, since PVA is only composed of three elements, C, H, and O, its flame retardancy and antibacterial properties are not ideal, and its limiting oxygen index is only 19.7.
PVA is still lacking in flame retardancy, antibacterial and UV resistance, which limits its application in packaging materials

Method used

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  • Curcumin modified layered clay/polyvinyl alcohol nano composite film and preparation method thereof
  • Curcumin modified layered clay/polyvinyl alcohol nano composite film and preparation method thereof
  • Curcumin modified layered clay/polyvinyl alcohol nano composite film and preparation method thereof

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preparation example Construction

[0023] The preparation method of a kind of curcumin-modified layered clay / polyvinyl alcohol nanocomposite film provided by the embodiment of the present invention comprises the following steps:

[0024] S1, the preparation of hydrotalcite: the MgCl 2 ·6H 2 O, urea and AlCl 3 ·6H 2 O is dissolved in deionized water to obtain a mixed solution, and the mixed solution is ultrasonically treated and reacted under high temperature and high pressure to obtain a hydrotalcite slurry, which is centrifuged, washed and dried to obtain hydrotalcite. MgCl used in the present invention 2 ·6H 2 O, urea and AlCl 3 ·6H 2 O can be obtained commercially, such as MgCl 2 ·6H 2 O, urea and AlCl 3 ·6H 2 O can be purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.

[0025] LDHs are layered hydroxides composed of bimetallic magnesium and aluminum linked by hydroxyl and carbonate ions. As an anionic layered clay, LDHs has good barrier properties, specific surface area and structu...

Embodiment 1

[0041] A kind of curcumin modified layered clay / polyvinyl alcohol nanocomposite film provided by the present embodiment is prepared according to the following method:

[0042] (1) Preparation of LDHs: first add 0.953gMgCl to 32mL ionized water 2 ·6H 2 O (4.594mmol), 0.5067g urea (8.295mmol) and 0.3772g AlCl 3 ·6H 2 O (1.005mmol) prepared a mixed solution. Then the mixed solution was ultrasonically dispersed until it was evenly dispersed, then transferred to a polytetrafluoroethylene container with a capacity of 50 mL, and the polytetrafluoroethylene container was placed into a matching stainless steel autoclave and locked. After heating the oven to 95°C, put the stainless steel autoclave into it, then continue to heat up to 160°C, and react at high temperature and high pressure for 6h. After the reaction is finished, the obtained LDHs slurry is centrifuged, washed and finally dried in a freeze dryer to obtain white LDHs powder.

[0043] (2)LDHs@CUR-Cu 2+ Preparation: 0.0...

Embodiment 2

[0046] This example provides a curcumin-modified layered clay / polyvinyl alcohol nanocomposite film, which is different from Example 1 in that LDHs@CUR-Cu 2+ / PVA nanocomposite film (LCP-1%), LDHs@CUR-Cu 2+ The mass percent is 1wt%.

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Abstract

The invention provides a curcumin modified layered clay / polyvinyl alcohol nano composite film and a preparation method thereof, and relates to the technical field of packaging materials. The preparation method of the composite film comprises the steps of carrying out deposition adsorption and complexation on CUR and Cu < 2 + > on the surface of LDHs to prepare LDHs@ CUR-Cu < 2 + >, and then blending the LDHs@CUR-Cu < 2 + > and PVA by adopting a solution pouring method to prepare the LDHs@CUR-Cu < 2 + > / PVA nano composite film. The LDHs have good barrier property, specific surface area and structural designability, and the LDHs have high charge density and are not easy to fall off and separate in a solvent. After being added into PVA, the LDHs can be dispersed in the PVA, so that the mechanical property and the thermal stability of the PVA film are effectively improved. The loading of the CUR can effectively improve the antibacterial property and oxidation resistance of the LDHs / PVA nano composite film and prolong the shelf life of food. In addition, the application of the LDHs / PVA nano composite film in the field of intelligent packaging can be further expanded by utilizing the pH indicating property of curcumin.

Description

technical field [0001] The invention relates to the technical field of packaging materials, and in particular to a curcumin-modified layered clay / polyvinyl alcohol nanocomposite film and a preparation method thereof. Background technique [0002] In recent years, in order to extend the shelf life of food to cope with the impact of the globalization of the market, more and more active food packaging materials have entered people's field of vision. At present, non-degradable materials such as polyethylene and polyvinyl chloride are widely used in food packaging materials, which has caused great pressure on the environment. Polyvinyl alcohol (PVA) is a synthetic, multi-purpose water-soluble polymer, which is usually polymerized with vinyl acetate as a monomer, followed by alcoholysis or hydrolysis. As a non-toxic, odorless, degradable water-soluble polymer, PVA has a linear structure, stable chemical properties, good hydrophilic properties, excellent film-forming properties, h...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L29/04C08K3/22C08K5/13
CPCC08J5/18C08J2329/04C08K3/22C08K5/13
Inventor 毛龙白泽清徐晖刘跃军林雅婷叶舒灵
Owner XIAMEN UNIV OF TECH