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Inorganic packing modified nano cellulose and polylactic acid composite membrane and preparation thereof

A technology of nano-cellulose and inorganic fillers, applied in the field of inorganic filler-modified nano-cellulose and polylactic acid composite membranes and its preparation, can solve the problems of uneven dispersion of inorganic particles, achieve good antibacterial effect, high barrier performance, and simple operation Effect

Active Publication Date: 2019-08-30
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a composite film of inorganic filler modified nano-cellulose and polylactic acid and its preparation, which overcomes the defect of uneven dispersion of existing inorganic particles in high molecular polymers. The present invention uses microcrystalline fiber As the raw material, nanocellulose was prepared by sulfuric acid method, and it was modified with silver, and the modified nanocellulose and polylactic acid were blended to prepare nanocellulose and polylactic acid composite film.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Preparation of nanocellulose

[0027] Weigh 10 parts of microcrystalline cellulose, and slowly add 0.15 parts of 64%-65% sulfuric acid solution. Stir magnetically for 1 h under a constant temperature oil bath condition of 35°C-55°C. Add a large amount of distilled water to dilute the solution, let it stand for 1-2d, and pour off the upper acid solution. The remaining solution is centrifuged and washed until the pH value is 6-7, and the obtained concentrated nanocellulose suspension is placed in a vacuum freeze dryer, and freeze-dried to obtain nanocellulose powder.

[0028] Step 2: Modification of nanocellulose

[0029] Weigh 3 parts of nanocellulose powder, add 5mL of deionized water, and ultrasonically disperse for 20-30min. Add 30mL of 0.5mol / L silver nitrate solution, and then add 5mL of deionized water to make a 40mL mixed solution, and stir it magnetically under the condition of a constant temperature oil bath at 70°C-80°C. Slowly add 1mol / L sodium hyd...

Embodiment 2

[0033] Step 1: Preparation of nanocellulose

[0034] Weigh 12 parts of microcrystalline cellulose, and slowly add 0.2 parts of 64%-65% sulfuric acid solution. Stir magnetically for 1 h under a constant temperature oil bath condition of 35°C-55°C. Add a large amount of distilled water to dilute the solution, let it stand for 1-2d, and pour off the upper acid solution. The remaining solution is centrifuged and washed until the pH value is 6-7, and the obtained concentrated nanocellulose suspension is placed in a vacuum freeze dryer, and freeze-dried to obtain nanocellulose powder.

[0035] Step 2: Modification of nanocellulose

[0036] Weigh 3.3 parts of nanocellulose powder, add 7 mL of deionized water, and ultrasonically disperse for 20-30 min. Add 35mL of 0.5mol / L silver nitrate solution, and then add 7mL of deionized water to make a mixed solution of 49, and stir it magnetically under the condition of a constant temperature oil bath at 70°C-80°C. Slowly add 1mol / L sodium...

Embodiment 3

[0040] Step 1: Preparation of nanocellulose

[0041] Weigh 13.5 parts of microcrystalline cellulose, and slowly add 0.25 parts of 64%-65% sulfuric acid solution. Stir magnetically for 1 h under a constant temperature oil bath condition of 35°C-55°C. Add a large amount of distilled water to dilute the solution, let it stand for 1-2d, and pour off the upper acid solution. The remaining solution is centrifuged and washed until the pH value is 6-7, and the obtained concentrated nanocellulose suspension is placed in a vacuum freeze dryer, and freeze-dried to obtain nanocellulose powder.

[0042] Step 2: Modification of nanocellulose

[0043]Weigh 3.6 parts of nanocellulose powder, add 10 mL of deionized water, and ultrasonically disperse for 20-30 min. Add 35mL of 0.5mol / L silver nitrate solution, and then add 10mL of deionized water to make a 55mL mixed solution, and stir it magnetically under the condition of a constant temperature oil bath at 70°C-80°C. Slowly add 1mol / L sod...

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Abstract

The invention relates to an inorganic packing modified nano cellulose and polylactic acid composite membrane and preparation thereof. Microcrystalline cellulose is adopted as a raw material, nano cellulose is prepared by using a sulfuric acid method, and the nano cellulose is modified by using silver. The modified nano cellulose is commixed with polylactic acid to prepare the nano cellulose and polylactic acid composite membrane. The method provided by the invention is simple to operate and low in production cost, and the prepared membrane has good mechanical properties, high partitioning capabilities and good antibacterial effects, is good in comprehensive property, and is capable of meeting application requirements of fields such as agricultural membranes, packaging membranes and food packaging materials.

Description

technical field [0001] The invention belongs to the field of packaging materials and its preparation, in particular to a composite film of inorganic filler modified nanometer cellulose and polylactic acid and its preparation. Background technique [0002] Since the 20th century, a large number of petroleum products have been developed to produce packaging materials, which has caused huge global environmental problems. At present, the commonly used packaging film is mainly polyethylene or polyvinyl chloride plastic film. A large amount of non-degradable plastic packaging has caused great pressure on the environment, and the entire ecology has been threatened. The development of new green packaging materials has become an important task, and natural polymer materials have become the first choice, among which starch, chitosan, lignin, etc. have been included in the research scope. The research of new biomass materials has become a hot spot, and the development of degradable p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08L1/16C08K3/28C08B5/14C08J5/18
CPCC08B5/14C08J5/18C08J2367/04C08J2401/16C08K3/28
Inventor 余木火王凯丽陆建晓张辉韩克清刘勇刘百花凡凡杨赟曹珊珊张露莎
Owner DONGHUA UNIV
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