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Nano-cellulose flexible iridescent film and preparation method and application thereof

A nanocellulose and iridescent film technology, which is applied in the use of microorganism/enzyme cellulose treatment, nanocarbon, and fiber raw material treatment, etc., can solve the problems of insufficient environmental protection, poor optical performance, and complicated preparation process, and achieve production cost savings, The effect of simple operation and simple preparation process

Inactive Publication Date: 2020-05-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these preparation processes still have outstanding problems such as cumbersome preparation process, not being environmentally friendly, and poor optical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The preparation method of a kind of nano-cellulose flexible iridescent film of the present embodiment, the specific preparation steps are as follows:

[0038] (1) Enzyme pretreatment of masson pine pulp: add cellulosic enzyme at a ratio of 10 mg / g to the reaction kettle equipped with masson pine pulp, and carry out enzymatic hydrolysis at a pH of 4.0 and a temperature of 60°C Reaction 50min;

[0039] (2) Preparation of CNF: The slurry after step (1) enzymolysis is mechanically ground for 5 minutes at a speed of 1600 rpm with an ultrafine plant grinder, and homogenized for 5 minutes under the condition that the internal pressure of the homogenizer is 120 MPa to obtain the size Uniform CNF;

[0040] (3) Preparation of CNC: 50% mass concentration of p-toluenesulfonic acid was used to perform acid hydrolysis treatment on the slurry after step (1) enzymolysis at 50° C. for 40 minutes. After dialysis, rotary evaporation and concentration, and ultrasonic treatment (sonicatio...

Embodiment 2

[0048] The preparation method of a kind of nano-cellulose flexible iridescent film of the present embodiment, the specific preparation steps are as follows:

[0049] (1) Enzyme pretreatment of masson pine pulp: Add endocellulose at a rate of 11 mg / g to the reaction kettle equipped with masson pine pulp, and carry out enzymatic hydrolysis at a pH of 4.2 and a temperature of 63°C Reaction 60min;

[0050] (2) Preparation of CNF: The slurry after the enzymolysis in step (1) is mechanically ground for 10 minutes at a speed of 2000 rpm with an ultrafine plant grinder, and homogenized for 5 minutes under the condition that the internal pressure of the homogenizer is 150 MPa to obtain the size Uniform CNF;

[0051] (3) Preparation of CNC: use p-toluenesulfonic acid with a mass concentration of 55% to perform acid hydrolysis treatment on the slurry after the enzymatic hydrolysis in step (1) at 50° C. for 50 min. After dialysis, rotary evaporation and concentration, and ultrasonic tre...

Embodiment 3

[0059] The preparation method of a kind of nano-cellulose flexible iridescent film of the present embodiment, the specific preparation steps are as follows:

[0060] (1) Enzyme pretreatment of masson pine pulp: add endocellulose at a rate of 12 mg / g to the reaction kettle equipped with masson pine pulp, and carry out enzymatic hydrolysis at a pH of 4.2 and a temperature of 63°C Reaction 70min;

[0061] (2) Preparation of CNF: The slurry after step (1) enzymolysis is mechanically ground for 15 minutes at a speed of 2000 rpm by an ultrafine plant grinder, and homogenized for 10 minutes under the condition that the internal pressure of the homogenizer is 180 MPa to obtain the size Uniform CNF;

[0062] (3) Preparation of CNC: use p-toluenesulfonic acid with a mass concentration of 55% to perform acid hydrolysis treatment on the slurry after the enzymatic hydrolysis in step (1) at 50° C. for 60 min. After dialysis, rotary evaporation and concentration, and ultrasonic treatment (...

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Abstract

The invention discloses a nano-cellulose flexible iridescent film and a preparation method and application thereof, belonging to the field of preparation of functional film materials. The method comprises the following steps: carrying out enzymolysis pretreatment on masson pine pulp; preparing CNF; preparing CNC; preparing CODs; and conducting compounding for film formation. The preparation methodfor film formation is simple in process, controllable in conditions and easy to operate. The CNF, the CNC and the CODs are all from the same initial raw material (namely, the masson pine pulp), so integrated preparation of the flexible film is achieved; and the preparation processes of the three cellulose nanomaterials are simple and easy to operate, mild and friendly reagents are added, and extra chemical reagents are not needed, so environmental friendliness and low energy consumption are achieved, and the concept of sustainable development is met. Therefore, a blending strategy of the CNF,the CNC and the CODs is used for improving the mechanical performance and the optical performance of the iridescent film. The obtained nano-cellulose flexible iridescent film is excellent in performance, and can be applied as a chiral film material to the fields of safety anti-counterfeiting and information encryption.

Description

technical field [0001] The invention belongs to the field of preparation of functional film materials, and in particular relates to a nano-cellulose flexible iridescent film and its preparation method and application. Background technique [0002] Cellulose is the most abundant natural polymer on earth and has good biocompatibility, renewability and biodegradability. Therefore, the preparation of nanomaterials from fiber raw materials is the best answer made by the scientific community to environmental problems and energy crises. At present, due to its excellent low toxicity, mechanical and optical properties, nanocellulose materials have attracted extensive attention and research, mainly involving cellulose nanocrystals (CNC) and cellulose nanofibrils (CNF) materials. It is generally believed that CNC refers to a type of material with a width of 2-30nm and a length of 50-500nm, which is often prepared by chemical methods; while CNF has a width of no more than 100nm and a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08L1/04C08K3/04C08J5/18C08B15/02D21C5/00C01B32/15
CPCC08B15/02C08J5/18C08J2301/02C08J2401/04C08K3/04C01B32/15D21C5/005
Inventor 程峥陈克复曾劲松王斌徐峻高文花胡复港
Owner SOUTH CHINA UNIV OF TECH
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