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Cellulose nanofibril-PBAT composite film as well as preparation method and application thereof

A nanofibril and composite film technology, applied in the field of bio-based degradable films, can solve the problems that cellulose cannot form interwoven network connections, cannot retain nanocellulose amorphous regions, and reduce nanocellulose yield, etc. Good waterproof performance, high elongation at break, rich in hydroxyl groups

Inactive Publication Date: 2021-09-03
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cellulose straw prepared by this method has too many exposed hydroxyl groups on the outside, and its waterproof performance is poor, which greatly limits its practical application, and the acid method will seriously degrade the cellulose, and it is impossible to retain more nano-cellulose amorphous area, it will reduce the yield of nanocellulose, and the final nanocellulose is a one-dimensional rod-like structure, and the interwoven network connection between the cellulose cannot be formed.

Method used

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  • Cellulose nanofibril-PBAT composite film as well as preparation method and application thereof
  • Cellulose nanofibril-PBAT composite film as well as preparation method and application thereof
  • Cellulose nanofibril-PBAT composite film as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A kind of cellulose nano fibril-PBAT composite film, its preparation method comprises the following steps:

[0055] 1) Add 50 g of hardwood pulp into water, soak for 24 hours, prepare a cellulose suspension with a mass fraction of 1%, and then transfer it to a superfine particle pulverizer (Japan Zengxing Sangyo Co., Ltd., model: MKCA6-2J) In the process, adjust the rotating speed of the ultrafine particle pulverizer to 2000r / min, the gap is 5 μm, and circulate the pulverization process 20 times, centrifuge, and the solid product obtained is redispersed with water to obtain cellulose nanofibrils (length 200nm~ 1500nm, diameter 1nm~150nm) dispersion liquid;

[0056] 2) Add 8g of nano-soil (particle size 200nm to 350nm) dispersion with a mass fraction of 5% into 300g of cellulose nanofibril dispersion with a mass fraction of 1%, and magnetically stir for 1 hour to obtain cellulose nanofibrils- Nano-soil mixture;

[0057]3) Pour the cellulose nanofibril-nanosoil mixture ...

Embodiment 2

[0062] A kind of cellulose nano fibril-PBAT composite film, its preparation method comprises the following steps:

[0063] 1) Add 100 g dry weight softwood pulp into water, soak for 36 hours, prepare a cellulose suspension with a mass fraction of 3%, and then transfer it to an ultrafine particle pulverizer (Japan Zengxing Sangyo Co., Ltd., model: MKCA6-2J) In the process, adjust the rotating speed of the ultrafine particle pulverizer to 4000r / min, the gap is 20 μm, and circulate the crushing process 20 times, centrifuge, and the solid product obtained is redispersed with water to obtain cellulose nanofibrils with a mass fraction of 3% (length 200nm~ 2000nm, diameter 1nm ~ 300nm) dispersion liquid;

[0064] 2) Add 10.53g of 5% nano-soil (particle size 200nm to 500nm) dispersion into 320g of 3% cellulose nanofibril dispersion, and stir magnetically for 1 hour to obtain cellulose nanofibrils - nano-soil mixture;

[0065] 3) Pour the cellulose nanofibril-nanosoil mixture into a ...

Embodiment 3

[0070] A kind of cellulose nano fibril-PBAT composite film, its preparation method comprises the following steps:

[0071] 1) Add cotton pulp with a dry weight of 50 g into water, soak for 48 hours, prepare a cellulose suspension with a mass fraction of 5%, and then transfer it to a superfine particle pulverizer (Japan Zengxing Sangyo Co., Ltd., model: MKCA6-2J) , adjust the rotating speed of the superfine particle grinder to 2500r / min, the gap is 10 μm, and the circulation pulverization process is 15 times, centrifuged, and the solid product obtained is redispersed with water to obtain cellulose nanofibrils (length 200nm~4000nm) with a mass fraction of 5%. , diameter 1nm ~ 200nm) dispersion;

[0072] 2) Add 6.5g of 5% nano-soil (particle size 250nm to 500nm) dispersion into 100g of 5% cellulose nanofibril dispersion, and magnetically stir for 1 hour to obtain cellulose nanofibrils - nano-soil mixture;

[0073] 3) Pour the cellulose nanofibril-nanosoil mixture into a film ca...

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Abstract

The invention discloses a cellulose nanofibril-PBAT composite film as well as a preparation method and application thereof. The cellulose nanofibril-PBAT composite film disclosed by the invention is prepared from cellulose nanofibril, PBAT and nano soil. The preparation method of the cellulose nanofibril-PBAT composite film comprises the following steps: 1) preparing a cellulose nanofibril dispersion liquid; (2) preparing a cellulose nanofibril-nano soil mixed solution; 3) preparing a cellulose nanofibril film; and 4) dipping the cellulose nanofibril film in PBAT dispersion liquid. According to the invention, the nanocellulose fibrils are taken as a matrix and compounded with PBAT through intermolecular force, hydrogen-bond interaction and interface fusion, no chemical modification treatment is needed, and the obtained composite film has the advantages of good waterproof performance, high elongation at break, safety and environmental protection, and can be widely applied to the fields of agricultural plastic mulching films, product packaging, insulating materials, packaging materials and the like.

Description

technical field [0001] The invention relates to the technical field of bio-based degradable films, in particular to a cellulose nanofibril-PBAT composite film and its preparation method and application. Background technique [0002] Plastics are used more and more widely around the world, and since 2014, the annual global plastic production has exceeded 300 million tons. However, the long and persistent degradation cycles of plastics in the environment, with potential adverse consequences for nature and human health, necessitate the development of sustainable alternatives. [0003] PBAT (a copolymer of butylene adipate and butylene terephthalate) is a thermoplastic biodegradable plastic with good ductility, large elongation at break, and good heat resistance Good impact resistance and excellent biodegradability have become one of the research hotspots in the field of biodegradable plastics. At the same time, PBAT belongs to aliphatic aromatic polyester, has good biocompati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L1/02C08L67/02C08K3/34C08J5/18
CPCC08J5/18C08J2301/02C08J2467/02C08K3/34C08K2201/005C08K2201/011
Inventor 李军史蓝洁莫立焕廖建明张希
Owner SOUTH CHINA UNIV OF TECH
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