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Modified nanocellulose reinforced thermoplastic starch food packaging film preparation method

A technology of nanocellulose and packaging film, applied in the field of food packaging, can solve problems such as non-nanocellulose modification, and achieve the effects of low price, good mechanical strength and low production cost

Inactive Publication Date: 2019-02-19
广西春景环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And there is no report about modifying nanocellulose with food-grade modifiers and adding it to starch to prepare composite food packaging films.

Method used

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  • Modified nanocellulose reinforced thermoplastic starch food packaging film preparation method
  • Modified nanocellulose reinforced thermoplastic starch food packaging film preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation of enhancers:

[0033] (1) Take 50g of cassava dregs and add 500g of water to boil to fully gelatinize the starch, then cool down to 60°C; add 7.5g of cassava dregs quality α-amylase solution, 100W 45°C ultrasonic treatment for 45min; heat to 100°C to extinguish Enzyme for 5 minutes, take 2000ml of distilled water and wash until the upper aqueous solution is clear, dry at 80°C to constant weight, and seal and store for later use;

[0034] (2) Take the cassava residues treated in step (1), add 7% NaOH solution according to the ratio of solid to liquid 1:10, alkali hydrolyze at 70°C for 90min, wash with 2000ml of distilled water until neutral, dry at 80°C to constant weight , sealed and kept for later use;

[0035] (3) Take the dried cassava dregs in step (2), and add 63% sulfuric acid solution at a ratio of 1:20 to mix. Put the mixed solution into a high-speed disperser (setting speed 4500r / min), and stir at room temperature for 120min. After stirring, 200...

Embodiment 2

[0044] Preparation of enhancer: the method is the same as that used in Example 1.

[0045] Preparation of composite food packaging film:

[0046] (1) Take 25g of starch, add 500g of water, fully gelatinize at 85°C, add 6.32g of glycerin, and keep stirring for 20min;

[0047] (2) Add 0.33 g of modified nanocellulose to 10 g of water, ultrasonicate at room temperature at 480 W for 30 min, add to the starch solution in step (1) and continue mixing and stirring for 30 min at 95° C. to prepare a film-forming liquid. During the stirring process, pay attention to sealing to prevent the loss of moisture during heating;

[0048] (3) Cast the prepared membrane solution on plexiglass, and dry it at 45°C to form a membrane.

Embodiment 3

[0050] Preparation of enhancer: the method is the same as that used in Example 1.

[0051] Preparation of composite food packaging film:

[0052] (1) Take 25g of starch, add 500g of water, fully gelatinize at 95°C, add 10.64g of glycerin, and keep stirring for 30min;

[0053] (2) Add 1.0 g of modified nanocellulose to 10 g of water, ultrasonicate at room temperature at 480 W for 50 min, add to the starch solution in step (1) and continue mixing and stirring for 40 min at 95° C. to prepare a film-forming liquid. During the stirring process, pay attention to sealing to prevent the loss of moisture during heating;

[0054] (3) Cast the prepared membrane solution on plexiglass, and dry it at 65°C to form a membrane.

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Abstract

The invention discloses a modified nanocellulose reinforced thermoplastic starch food packaging film preparation method, and belongs to the technology of composite food packaging film preparation. Accordingly, cassava residues are used as raw materials to prepare nanocellulose, food grade soybean oil serves as an esterifying agent, and hydrophobic modification is conducted on the nanocellulose; cassava starch is used as a base material, glycerin serves as a plasticizer, the modified nanocellulose is added to serve as a reinforcing agent, and a starch-based food packaging film is obtained through a casting film forming method. The prepared modified nanocellulose reinforced thermoplastic starch compound food packaging film has the advantages of being low in price, high in production efficiency, good in performance, environmentally friendly and degradable, the modified nanocellulose reinforced thermoplastic starch film greatly overcomes the defects that the starch film strength is low, and water absorption is easy, and pollution of nondegradable food packaging to the environment is avoided.

Description

technical field [0001] The invention belongs to the technical field of food packaging, and in particular relates to a preparation method of modified nanocellulose reinforced starch composite food packaging film. Background technique [0002] Due to the complexity and particularity of environmental pollution, bad packaging materials not only endanger human survival and social health, but also affect the prosperity of the market. Researchers have been committed to finding a green and pollution-free renewable packaging material. Starch is a raw material with wide sources, low price and complete degradability. Using starch as a raw material can greatly reduce the environmental pollution caused by petroleum-based packaging materials and save costs. However, thermoplastic starch has strong hydrophilicity, so the thermoplastic starch material has poor water resistance and is easy to absorb moisture. The environmental humidity has a great influence on the various properties of the m...

Claims

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Application Information

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IPC IPC(8): C08L3/02C08L1/02C08L91/00C08K5/053C08J5/18
CPCC08J5/18C08J2303/02C08J2401/02C08J2491/00C08K5/053
Inventor 不公告发明人
Owner 广西春景环保科技有限公司
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