Preparation method of a green degradable high-barrier and high-transparency nano-cellulose composite film

A nanocellulose, high-transparency technology, applied in the field of packaging materials, can solve the problems of unsatisfactory mechanical properties, insufficient transparency, and barrier properties to be improved, and achieves improved oxygen barrier properties and strength properties, excellent water resistance, and improved barrier properties. performance effect

Active Publication Date: 2021-01-12
杭州市化工研究院有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these green barrier packaging materials generally have problems such as unsatisfactory mechanical properties, barrier properties to be improved, and insufficient transparency.

Method used

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  • Preparation method of a green degradable high-barrier and high-transparency nano-cellulose composite film
  • Preparation method of a green degradable high-barrier and high-transparency nano-cellulose composite film
  • Preparation method of a green degradable high-barrier and high-transparency nano-cellulose composite film

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preparation example Construction

[0043] A method for preparing a green degradable high-barrier and high-transparency nanocellulose composite film, comprising the following steps:

[0044] 1) Add nanocellulose gel with a concentration of 0.5-1.5wt% into water, prepare a nanocellulose solution with a concentration of 0.1-0.8wt%, and disperse at 10000-15000r / min for 5-15min.

[0045] 2) Adding nanoclay inorganic particles into water to prepare a nanoclay suspension with a concentration of 0.5-5 wt%, and dispersing at 10000-15000 r / min for 2-6 hours.

[0046] 3) Take solid PVA and dissolve it in water to prepare a PVA solution with a concentration of 5-10wt%, then add nanocellulose dispersion, heat and stir in a water bath at 90-100°C for 1-3 hours, then add nano-clay suspension, continue Stir and mix for 2-4 hours to obtain a nanocellulose / PVA / nanoclay composite liquid, wherein the mass ratio of PVA, nanocellulose and nanoclay is 70-98:1-15:1-15.

[0047] 4) Put the nanocellulose / PVA / nanoclay composite liquid a...

Embodiment 1

[0054] 1) Preparation of nanocellulose aqueous dispersion:

[0055] Get 200g concentration and be that the nano-cellulose (nanofibrillated cellulose) gel of 1% is added into the deionized water of 200g, be mixed with the nano-cellulose solution that concentration is 0.5%, adopt high-speed disperser at the number of revolutions of 10000r / min Disperse for 15 minutes.

[0056] 2) Preparation of nanoclay suspension: get 10g of nanoclay inorganic particles (bentonite) and add it to 200g of deionized water to prepare a nanoclay suspension with a concentration of 0.5%, and disperse at a speed of 10000r / min using a high-speed disperser Processing 2h.

[0057] 3) Preparation of nanocellulose / PVA / nanoclay composite liquid: take 8g of solid PVA (degree of polymerization between 600~2500, degree of alcoholysis between 80%~98%) and dissolve it in 100g of deionized water, Then add a certain proportion of nano-cellulose aqueous dispersion, place it in a 90°C constant temperature water bath...

Embodiment 2

[0061] A method for preparing a green degradable high-barrier and high-transparency nanocellulose composite film, comprising the following steps:

[0062] 1) Inoculate the Acetobacter xylinum strain into the seed medium, plug the bottle mouth with sterilized cotton, shake gently to disperse the seeds in the medium, and then culture it in a constant temperature incubator at 25°C for 3 days. Take the activated strain and insert it into the slant culture medium, shake and cultivate it in a constant temperature shaker at 30°C and 150rpm for 24 hours. Then take 15mL of cultured seeds and insert them into 200mL of fermentation medium, shake fully to separate the strains and fully disperse them in the fermentation medium, then vibrate and culture in a constant temperature shaker at 30°C and 150rpm for 7 days to obtain bacterial fibers plain film. Take out the bacterial cellulose membrane from the fermentation medium, filter it, wash it with deionized water, soak it in 4% NaOH soluti...

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Abstract

The invention relates to the field of packaging materials and discloses a preparation method of an environment-friendly degradable high-resistance and high-transparency composite film. The preparationmethod comprises the following steps: (1) preparing a cellulose aqueous dispersion solution; (2) preparing a nanoclay suspension solution; (3) preparing nano-cellulose / PVA / nanoclay composite liquid;(4) carrying out standing defoaming on the nano-cellulose / PVA / nanoclay composite liquid, pouring the nano-cellulose / PVA / nanoclay composite liquid into a mold for leveling, and carrying out vacuum drying, so as to obtain a nano-cellulose / PVA / nanoclay composite film; and (5) putting the composite film into acyl chloride / petroleum ether mixed liquid for immersion treatment, and heating to react, so as to finish acylating chlorination hydrophobic treatment of the composite film. The composite film material prepared by virtue of the preparation method has excellent oxygen-water steam barrier property and mechanical property and good biodegradability, and the light transmittance reaches up to 89%, so that the composite film material has wide commercial application potentials in the fields of food fresh-keeping packages, drug packages, environment-friendly degradable packaging materials and the like.

Description

technical field [0001] The invention relates to the field of packaging materials, in particular to a preparation method of a green degradable high-barrier and high-transparency nano-cellulose composite film. Background technique [0002] Since the 21st century, plastic packaging materials based on petroleum products have produced a large amount of non-degradable packaging waste, which has caused global environmental problems. In recent years, in order to meet the new demand for packaging materials in various fields, packaging materials have developed in the direction of high quality, high strength, multi-function, new technology, and lightweight. The development of the world economy, the shortage of environmental resources and the change of life concept have made people's awareness of environmental protection increasingly stronger, and the concept of green degradable environmental protection materials has emerged as the times require. [0003] The currently researched green...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08J7/12C08L29/04C08L1/02C08K3/34
CPCC08J5/18C08J7/12C08J2329/04C08J2401/02C08K3/346C08K2201/011
Inventor 范俊蒋健美王立军姚献平赵文彦
Owner 杭州市化工研究院有限公司
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