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Preparation method of nano cellulose composite film capable of responding to humidity and obtained product

A technology of nano-cellulose and composite film, which is applied in the field of nano-cellulose composite film and its preparation, which can solve the problems of difficult processing and poor thermal stability of CNC film, and achieve good hygroscopic properties

Pending Publication Date: 2022-04-12
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Cellulose nanocrystals (CNC) have great application prospects in the fields of food science and engineering. However, due to the poor thermal stability and difficult processing of CNC films, there is still a big gap with practical applications.

Method used

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  • Preparation method of nano cellulose composite film capable of responding to humidity and obtained product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Configured as a CNC suspension with a concentration of 1.5wt%: add ultrapure water into the beaker, and turn on the magnetic stirrer, the stirring speed is 1000r / min; slowly add a certain mass of CNC powder in the vortex, mix for 1h, to ensure good dispersion.

[0032] Mixed with 1,3-butanediol BG in a mass ratio of 1:9 (BG: CNC suspension),

[0033] The mixed CNC suspension was treated with an ultrasonic cell disruptor in an ice-water bath, the probe was placed 1 cm below the liquid surface, the ultrasonic time was 2 s, the interval time was 2 s, and the total ultrasonic wave was 1 min. .

[0034] (2) The suspension treated in step (1) is placed in a polystyrene petri dish, and dried at 25° C. and 35% humidity. In this example, 3 mL of the suspension was placed in a polypropylene petri dish with a diameter of 35 mm, the liquid surface height was about 0.3 cm, and the thickness of the dried film was about 0.1-0.3 mm.

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Abstract

The invention provides a preparation method of a nano cellulose composite film capable of responding to humidity and an obtained product. The preparation method comprises the following steps: (1) preparing nanocellulose crystals and water into a suspension according to a ratio of 1: (50-80), mixing the suspension with 1, 3-butanediol BG according to a ratio of 1: (8-12), uniformly stirring the mixed suspension, and performing ultrasonic treatment; and (2) putting the suspension treated in the step (1) into a drying container, and naturally standing, evaporating and drying at the temperature of 20-30 DEG C and the humidity of 30-40%. According to the nanocellulose composite film provided by the invention, due to the addition of exogenous additives, the film becomes smoother, the thermal stability is higher, and the film has humidity response performance.

Description

technical field [0001] The invention belongs to the technical field of organic polymer compounds, in particular to a nanocellulose composite film and a preparation method thereof. Background technique [0002] Nanocellulose crystals (less than 100 nm in diameter) are nanoscale cellulose materials with good biocompatibility, non-toxicity, and biodegradability. Nanocellulose crystals have a chiral nematic structure with unique optical properties. After a specific process, this optical property can be preserved in the nanocellulose film, so that the nanocellulose film has an iridescent structural color, and the color of the film changes with the viewing angle. Because of its special optical properties, iris film can be used in optical sensors, decorations, optical anti-counterfeiting and other fields. [0003] The nanofiber crystal film currently produced is relatively brittle, and many polymers such as polyethylene glycol and low-density polyethylene are used to compound nan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08K5/053C08J5/18
Inventor 宋弋王天卉孟祥楠户昕娜周宇星
Owner CHINA AGRI UNIV
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