Cellulose nano fiber/polylactic acid composite material and preparation method thereof

A technology of nanofibers and composite materials, which is applied in the field of cellulose nanofiber/polylactic acid composite materials and its preparation, can solve the problems of certain difficulty in industrial scale-up and high requirements for experimental conditions, achieve fine size, improve hydrophobicity, and improve Dispersion effect

Inactive Publication Date: 2016-08-24
JIANGSU SUPLA BIOPLASTICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in situ synthesis requires high experimental conditions, and industrial scale-up is also difficult.

Method used

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  • Cellulose nano fiber/polylactic acid composite material and preparation method thereof
  • Cellulose nano fiber/polylactic acid composite material and preparation method thereof
  • Cellulose nano fiber/polylactic acid composite material and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0028] As shown in the figure, a cellulose nanofiber / polylactic acid composite material and its preparation method, the cellulose nanofiber / polylactic acid composite material includes the following components in weight percentage: polylactic acid: 60-99wt%, Cellulose nanofibers: 1-40wt%, other additives: 0.1-40wt%, characterized in that it comprises the following steps:

[0029] 1) Put the quantitative cellulose nanofiber puree in a flask, pour an appropriate amount of organic solvent, ultrasonically oscillate and stir for a period of time and then filter, repeat the process of stirring, dispersing and filtering 1 to 5 times until the organic solvent dissolves the cellulose nanofiber Most of the water in the fiber pulp is replaced, and the last filtration is to obtain a cellulose nanofiber filter cake;

[0030] 2) Place the cellulose nanofiber filter cake obtained in step 1) in a flask, add an appropriate amount of toluene solvent, ultrasonically oscillate and stir for a perio...

Embodiment 1

[0044] Take 10g of MFC puree into a three-necked flask, add 50ml of acetone, ultrasonically and mechanically stir for 2 hours, filter the resulting suspension with a Buchner funnel, add the filter cake into a three-necked flask, repeat the above steps three times, and finally obtain an MFC filter cake. Put this filter cake into a three-necked flask, add 50ml of toluene, stir and filter according to the above steps, and repeat twice. Then put the obtained filter cake into a three-necked flask, add 50ml of toluene, add 37.77g of acetic anhydride and 1.46g of pyridine, and react at 105°C for 2h. After the reaction is completed, filter, and the obtained filter cake is repeatedly washed with toluene solution to obtain acylated modified MFC (MMFC).

[0045] Dry the untreated MFC and MMFC for infrared analysis, figure 1 It is the FTIR spectrum of MFC and MFC after acylation, at 2906cm -1 , the acylated MFC has the C-H stretching vibration absorption peak of the methyl group, and at...

Embodiment 2

[0047] Take 10g of MFC puree into a three-necked flask, add 50ml of acetone, ultrasonically and mechanically stir for 2 hours, filter the resulting suspension with a Buchner funnel, add the filter cake into a three-necked flask, repeat the above steps three times, and finally obtain an MFC filter cake. Put this filter cake into a three-necked flask, add 50ml of toluene, stir and filter according to the above steps, and repeat twice. Then the obtained filter cake was added into a three-necked flask, 50 ml of toluene was added, 37.77 g of acetic anhydride and 1.46 g of pyridine were added, and the mixture was reacted at 105°C. A total of four groups of experiments were carried out, and the reaction times were 30min, 1h, 2h, and 10h. After the reaction is completed, filter, and the obtained filter cake is repeatedly washed with toluene solution to obtain acylated modified MFC.

[0048] Take a small amount of the above-mentioned test samples, stir ultrasonically to evenly dispers...

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Abstract

The invention discloses a cellulose nano fiber / polylactic acid composite material and a preparation method thereof. The cellulose nano fiber / polylactic acid composite material comprises the following components in percentage by weight: 60-99 wt% of polylactic acid, 1-40 wt% of cellulose nano fiber and 0.1-40 wt% of other aids. The preparation method comprises the following steps: dewatering a cellulose nano fiber primary pulp by using an organic solvent, replacing acetone with a methylbenzene solvent, adding acetic anhydride and pyridine to react, finally adding polylactic acid to obtain a mixed solution, and drying to obtain the cellulose nano fiber / polylactic acid composite material. The cellulose nano fibers are pretreated to enhance the dispersity; and the treated cellulose nano fibers are subjected to solution blending with the polylactic acid to prepare the cellulose nano fiber / polylactic acid composite material. The composite material can be directly used after being pulverized, or can be used as a reinforcing master batch to be compounded with the polylactic acid by melt extrusion, injection molding and the like to prepare the cellulose-nano-fiber-reinforced polylactic acid composite material with lower fiber content, higher mechanical strength and higher crystallization speed.

Description

technical field [0001] The invention relates to the technical field of polymer processing, in particular to a cellulose nanofiber / polylactic acid composite material and a preparation method thereof. Background technique [0002] Polylactic acid (PLA), as a biodegradable polymer material derived from renewable resources, is currently widely used in medicine, packaging and other industries. However, due to its fatal defects such as high brittleness, poor heat resistance, low impact resistance, and slow crystallization rate, the application of PLA in more fields is severely limited. [0003] Cellulose nanofibers are nano-sized aggregates of cellulose microfibrils, which are often used as reinforcement materials due to their high strength and high modulus, and they also have excellent nucleation properties. According to previous studies, the combination of cellulose nanofibers and PLA can not only greatly improve the strength and modulus of the material, but also increase the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/12C08B3/06
Inventor 宋亚男杨波吕忠元宾月珍张简邦宏吴中仁
Owner JIANGSU SUPLA BIOPLASTICS CO LTD
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