Cellulose nanocrystal/ethylene-vinyl acetate (EVA) gas separating membrane, preparation method thereof and application thereof

A technology of gas barrier films and nanocrystals, which is applied in transportation and packaging, flexible coverings, packaging, etc., can solve the problems of insufficient dispersion, small layered montmorillonite sheets, and the addition of fillers should not be too large, etc. Achieve the effect of simple preparation method and good water vapor barrier performance

Inactive Publication Date: 2015-04-22
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation technology of polymer / inorganic nanocomposites has become increasingly mature, but there are still some shortcomings: (1) The amount of filler added should not be too large, and the layering of montmorillonite sheets is relatively small, and there are many permeation channels for small molecular substances, so The barrier performance is not as good as that of secondary processed composite barrier materials, such as aluminum-plastic composite materials, etc.; (2) Since the improvement of barrier performance depends on the orientation degree and diameter-thickness ratio of the montmorillonite layer, the intercalation composite The technology can be used for films or thin-walled products, but it is difficult to apply in thick-walled products because the montmorillonite sheets are difficult to fully orient
However, there are a large number of hydroxyl groups on the surface of CNF, which has strong hydrophilicity, poor dispersion in organic solvents, and poor compatibility with polymer materials, which limits its application in nanocomposites.

Method used

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  • Cellulose nanocrystal/ethylene-vinyl acetate (EVA) gas separating membrane, preparation method thereof and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Preparation of carboxylated cellulose nanocrystals: Weigh 1 g of cellulose nanocrystals (Aladdin's reagent) into a 250 mL three-necked round-bottom flask, and then add 100 mL of deionized water to form a suspension. NaBr (0.10 g, 1 mmol), 0.016 g of TEMPO reagent (Aladdin reagent), and NaClO solution (86 g / L, 1.27 g) were sequentially added, and the reaction was performed under magnetic stirring at 20° C. for 4 h. During the reaction process, 0.5 mol / L NaOH solution was continuously added dropwise with a dropping funnel to keep the pH value of the system around 10 and remained unchanged. After the reaction, add 30mL saturated saline, centrifuge (3000rpm, 5min) to obtain the product; then wash 4 times with 1mol / L NaCl solution, 4 times with 0.1mol / L HCl solution, and 4 times with deionized water; Dialyze in a beaker filled with deionized water for 3 days, and dry in a vacuum oven at 50° C. for 24 hours to obtain carboxylated cellulose nanocrystals. Determination of ...

Embodiment 2

[0029] (1) Preparation of carboxylated cellulose nanocrystals: Weigh 1 g of cellulose nanocrystals (Aladdin's reagent) into a 250 mL three-necked round-bottom flask, and then add 100 mL of deionized water to form a suspension. NaBr (0.10g, 1mmol) and NaClO solution (86g / L, 3.38g) were added in sequence, and the reaction was performed under magnetic stirring at 20°C for 4h. During the reaction process, 0.5 mol / L NaOH solution was continuously added dropwise with a dropping funnel to keep the pH value of the system around 10 and remain unchanged. After the reaction, add 30mL saturated saline, centrifuge (3000rpm, 5min) to get the product; then wash 3 times with 1mol / L NaCl solution, 3 times with 0.1mol / L HCl solution, and 3 times with deionized water; Dialyze in a beaker filled with deionized water for 3 days, and dry in a vacuum oven at 50° C. for 24 hours to obtain carboxylated cellulose nanocrystals. Weigh 0.100g carboxylated cellulose nanocrystals into a 100ml Erlenmeyer fl...

Embodiment 3

[0034] (1) Preparation of carboxylated cellulose nanocrystals: Weigh 1 g of cellulose nanocrystals (Aladdin's reagent) into a 250 mL three-necked round-bottom flask, and then add 100 mL of deionized water to form a suspension. NaBr (0.10 g, 1 mmol), 0.016 g of TEMPO reagent, and NaClO solution (86 g / L, 5.08 g) were added in sequence, and the reaction was performed under magnetic stirring at 20° C. for 4 h. During the reaction process, 0.5 mol / L NaOH solution was continuously added dropwise with a dropping funnel to keep the pH value of the system around 10 and remain unchanged. After the reaction, add 30mL saturated saline, centrifuge (3000rpm, 5min) to obtain the product; wash with 1mol / L NaCl solution 3 times, 0.1mol / L HCl solution 3 times, and deionized water 3 times; Dialyze in a beaker of deionized water for 3 days, and dry in a vacuum oven at 50° C. for 24 hours to obtain carboxylated cellulose nanocrystals. Weigh 0.100g carboxylated cellulose nanocrystals into a 100ml ...

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Abstract

The invention belongs to the field of high polymer materials, and discloses a cellulose nanocrystal / ethylene-vinyl acetate (EVA) gas separating membrane, a preparation method of the cellulose nanocrystal / EVA gas separating membrane and application of the cellulose nanocrystal / EVA gas separating membrane. The preparation steps of the cellulose nanocrystal / EVA gas separating membrane comprises (1) adding sodium bromide, a 2,2,6,6-tetramethylpiperidinooxy (TEMPO) reagent and a sodium hypochlorite solution into cellulose nanocrystal suspension liquid, keeping potential of hydrogen (pH) of a reaction to be in alkalinity, adding a saturated salt solution, centrifuging, washing, dialyzing, drying and obtaining carboxylation cellulose nanocrystal; (2) adding the carboxylation cellulose nanocrystal into organic solvent, wherein amine is dissolved in the organic solvent, and then adding a dimethylsulfoxide (DMSO) containing diisopropyl carbodiimide (DIC) and N-hydroxysuccinimide (NHS), stirring, centrifuging, removing upper layer liquid, washing, drying, and obtaining amidate cellulose nanocrystal; and (3) mixing the amidate cellulose nanocrystal and EVA into the cellulose nanocrystal / EVA gas separating membrane. Due to the fact that the cellulose nanocrystal / EVA gas separating membrane is good in light transmittance and water-vapor transmission rate, the cellulose nanocrystal / EVA gas separating membrane has good prospects in food packaging.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a cellulose nanocrystal / EVA gas barrier film and a preparation method and application thereof. technical background [0002] EVA is composed of non-polar, crystalline vinyl monomer (C 2 h 4 ) and highly polar, non-crystalline vinyl acetate monomer (CH 3 COOC 2 h 3 ) is a thermoplastic resin copolymerized, which is a random copolymer with a high degree of branching. EVA has excellent flexibility, elasticity, transparency, low temperature flexibility, adhesion, weather resistance, chemical resistance and compatibility with fillers and colorants. The content of vinyl acetate is 5%-45%. The main products are film and sheet, injection molding, molding products, foaming products, hot melt adhesives, etc. Its softness, toughness, stress crack resistance and transparency are superior to polyethylene, suitable for elastic packaging film, heat shrinkable film, agricultura...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L1/08C08B15/06B65D65/46
Inventor 许凯谭婵娟陈鸣才吴建成
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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