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Modified nanocellulose-polylactic acid composite film as well as preparation method and application thereof

A technology of nanocellulose and polylactic acid, which is applied in the field of food packaging materials and its preparation, can solve the problems of insufficient reliability of inorganic fillers and nanocellulose, and poor barrier properties of composite films, so as to improve easy agglomeration, improve barrier properties, and promote crystallization effect

Pending Publication Date: 2022-02-01
WANHUA CHEMICAL (NINGBO) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the prior art, it is disclosed that polylactic acid and nanocellulose are compounded to prepare food packaging materials, such as CN110183830A discloses a composite film of inorganic filler modified nanocellulose and polylactic acid and a preparation method thereof, which can improve the mechanical properties of polylactic acid, Barrier performance, but it has disadvantages such as insufficient reliability of inorganic fillers and nanocellulose, and poor barrier performance of the composite film

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Prepare modified nanocellulose and polylactic acid composite membrane, the steps are:

[0046] (1) Mix 10g of microcrystalline cellulose, 1g of silicotungstic acid with 100mL of deionized water, disperse in ultrasonic at 200W for 15min, then extract the mixture with 150mL of ether, let it stand for 2h to separate and separate the suspension (water phase), vacuum Dry at 0.01Mpa and 100°C for 2 hours to obtain powdered nanocellulose, specifically rod-shaped with a length of 50-150nm and a diameter of 15-25nm;

[0047] (2) Dissolve 0.3g of zinc acetate and 0.9g of sodium hydroxide in 50mL of ethanol, then add 2.5g of nanocellulose prepared in step (1) and mix evenly, stir magnetically at a speed of 6000r / min for 15min, filter, and heat at 80°C Ethanol is removed by volatilization at low temperature to obtain nanocellulose loaded with nano-zinc oxide, and the loading of nano-zinc oxide is 4-6wt%;

[0048] (3) Dissolve 0.002moL (0.38g) of zinc nitrate and 0.0016moL of hexam...

Embodiment 2

[0052] Prepare modified nanocellulose and polylactic acid composite membrane, the steps are:

[0053] (1) Mix 15g of microcrystalline cellulose, 1g of silicotungstic acid with 200mL of deionized water, disperse in ultrasonic at 225W for 20min, then extract the mixture with 600mL of ether, let it stand for 3h to separate and take the suspension, and the vacuum degree is 0.01MPa , drying at 105° C. for 2 hours to obtain powdered nanocellulose, specifically a rod shape with a length of 100-200 nm and a diameter of 20-30 nm;

[0054] (2) Dissolve 0.33g of zinc acetate and 1.32g of sodium hydroxide in 55mL of ethanol, then add 1.98g of the nanocellulose prepared in step (1) and mix evenly, stir magnetically at a rotating speed of 7000r / min for 20min, filter, and heat at 70°C Ethanol is removed by volatilization to obtain nano-cellulose loaded with nano-zinc oxide, and the loading of nano-zinc oxide is 6-8wt%;

[0055] (3) Dissolve 0.005moL (0.95g) of zinc nitrate and 0.005moL of h...

Embodiment 3

[0059] Prepare modified nanocellulose and polylactic acid composite membrane, the steps are:

[0060] (1) Mix 20g of microcrystalline cellulose, 1g of silicotungstic acid with 300mL of deionized water, disperse in ultrasonic at 250W for 30min, then extract the mixture with 1500mL of ether, let it stand for 4h to separate and take the suspension, and the vacuum degree is 0.02MPa , drying at 100° C. for 3 hours to obtain powdered nanocellulose, specifically a rod shape with a length of 150-300 nm and a diameter of 20-40 nm;

[0061] (2) Dissolve 0.6g of zinc acetate and 3g of sodium hydroxide in 70mL of ethanol, then add 3g of nanocellulose prepared in step (1) and mix evenly, stir magnetically at a speed of 8000r / min for 20min, filter, and volatilize at 80°C Ethanol is removed to obtain nanocellulose loaded with nano-zinc oxide, and the nano-zinc oxide loading is 8-11wt%;

[0062] (3) Dissolve 0.01moL (1.89g) of zinc nitrate and 0.012moL of hexamethylenetetramine in 500mL of w...

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Abstract

The invention relates to a modified nanocellulose-polylactic acid composite film and a preparation method and application thereof. The modified nanocellulose-polylactic acid composite film comprises polylactic acid and nano-zinc oxide modified nanocellulose. According to the preparation method, silicotungstic acid is adopted for preparing nano-zinc oxide, and the nano-zinc oxide is loaded on the nanocellulose, so the problem that the nano-zinc oxide is easy to agglomerate is solved; and the nano-zinc oxide is compounded with polylactic acid through a solution pouring method to prepare the composite film. The composite film prepared by the invention not only has the same advantages of high mechanical strength, strong plasticity, easy processing and molding and the like as polylactic acid, but also improves the mechanical properties of a polylactic acid film; and the composite film has excellent tensile properties, obviously enhanced impact resistance and heat resistance and good antibacterial properties and moisture-permeable barrier properties, and shows wide application prospects in the field of food packaging.

Description

technical field [0001] The invention belongs to the field of food packaging materials and their preparation, and in particular relates to a composite film of modified nano-cellulose and polylactic acid, its preparation method and application. Background technique [0002] After the advent of synthetic polymer materials, it has brought convenience to people's work and life, but it has also caused the consumption of petroleum resources and environmental pollution. Therefore, renewable and degradable green polymer materials have become a research hotspot today. Polylactic acid is a green polymer material made from renewable plants. It has a series of advantages such as wide and renewable sources of raw materials, safety, non-toxic and non-irritating, high mechanical strength, strong plasticity, and easy processing and molding. Can be completely degraded, eventually becoming water and carbon dioxide. However, polylactic acid is hard and brittle, has poor impact performance and ...

Claims

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Application Information

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IPC IPC(8): C08L67/04C08L1/04C08K9/12C08K3/22C08J5/18
CPCC08J5/18C08J2367/04C08J2401/04C08K9/12C08K2003/2296C08K2201/011Y02W90/10
Inventor 韦云涛李小博
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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