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A method for preparing a high-strength and high-toughness layered structure barrier film

A film and composite film technology, applied in the field of organic-inorganic hybrid film materials, can solve the problems of thick film thickness and poor mechanical properties, achieve low cost, excellent toughness, improve oxygen and water vapor barrier and flame retardant. sexual effect

Active Publication Date: 2021-05-04
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the evaporation self-assembly has the advantages of simple operation and easy controllable preparation, but the thickness of the obtained film is relatively thick and the mechanical properties are relatively poor.

Method used

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  • A method for preparing a high-strength and high-toughness layered structure barrier film
  • A method for preparing a high-strength and high-toughness layered structure barrier film
  • A method for preparing a high-strength and high-toughness layered structure barrier film

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preparation example Construction

[0038]According to the preparation method of the present invention, the imitation shell film binary and ternary layered structure films are prepared by combining evaporation self-assembly and hot pressing technology, the preparation method is simple, the raw material price is cheap, the source is abundant, the cost is low, the environment is friendly, and it is beneficial to Mass production. Especially in the preparation method of the present invention can effectively reduce the consumption of graphene (GO), GO plays the reinforcing phase of the co-dispersant of montmorillonite suspension solution and montmorillonite-carboxymethyl cellulose mixed solution, obtains The GO / MMT-CMC ternary composite film has excellent strength, toughness and modulus.

[0039] The mass ratio of CMC and MMT in step (3) of the preparation method according to the present invention is 10:90 to 90:10; preferably 20:80 to 80:20. When the MMT exceeds 90%, the dispersion of MMT in the CMC is poor, result...

Embodiment 1

[0044] (1) 10 g of CMC was dissolved in 500 ml of distilled water and stirred at a constant speed for 4 hours at room temperature to obtain a CMC solution with a concentration of 2% by mass. Dissolve 3g of MMT powder in 100ml of deionized water and stir overnight at a speed of 500r / min to swell, then continue to emulsify the swollen MMT suspension overnight with an emulsifier at 8000r / min for 5 times to fully swell and peel off, and let it stand Over night, a suspension of MMT was obtained. Add 160g of 2wt% CMC solution dropwise into 27g of MMT suspension, stir at normal speed for 24h, then ultrasonically remove bubbles for 15min, and set aside.

[0045] (2) Evaporative self-assembly: spread the mixed solution obtained in step (1) on a plastic surface dish by casting method, and dry overnight at 40° C. to obtain an MMT-CMC binary composite film.

[0046] (3) Hot press film formation: on the basis of the composite film obtained by evaporating the self-assembled film in step (2...

Embodiment 2

[0048] (1) 10 g of CMC was dissolved in 500 ml of distilled water and stirred at a constant speed for 4 hours at room temperature to obtain a CMC solution with a concentration of 2% by mass. Dissolve 3g of MMT powder in 100ml of deionized water and stir overnight at a speed of 500r / min to swell, then continue to emulsify the swollen MMT suspension overnight with an emulsifier at 8000r / min for 5 times to fully swell and peel off, and let it stand Over night, a suspension of MMT was obtained. 100g of CMC with a concentration of 2wt% was added dropwise to 70g of MMT suspension, stirred at a constant speed for 24h, then ultrasonically removed for 15min, and set aside.

[0049] (2) Evaporative self-assembly: spread the mixed solution obtained in step (1) on a plastic surface dish by casting method, and dry overnight at 40° C. to obtain an MMT-CMC binary composite film.

[0050] (3) Hot press film formation: on the basis of the composite film obtained by evaporation in step (2), at...

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Abstract

The invention combines evaporation self-assembly and hot pressing technology to prepare shell imitation binary and ternary layered structure films, the preparation method is simple, the raw material price is cheap, the source is abundant, the cost is low, the environment is friendly, and it is beneficial to large-scale production. The tensile strength of the film prepared by the present invention is as high as 320 MPa or more, the modulus has also been greatly improved, and the toughness is excellent; the excellent flame retardancy and gas barrier properties of the GO sheet and the MMT sheet are used to improve the barrier properties of the hybrid film. Oxygen and water vapor barrier and flame retardancy, such as the oxygen transmission rate of the organic-inorganic hybrid film is reduced by more than 50%; by adjusting the ratio between montmorillonite, graphene oxide and carboxymethyl cellulose, the Regulation of organic-inorganic hybrid membranes.

Description

technical field [0001] The invention belongs to the field of organic-inorganic hybrid film materials, and particularly relates to a method for preparing a high-strength, high-toughness, gas-barrier, and flame-retardant cellulose-based hybrid film with a shell-like structure by a hot pressing method. Background technique [0002] High-strength and high-toughness materials play a key role in aerospace and military industries, such as single crystal turbine blade materials in aero-engines, photovoltaic cell diaphragms on satellites, and submarine capacitor diaphragms, etc., but strength and toughness are often contradictory. Materials with high strength, such as ceramics, have poor toughness. Materials with good toughness, such as rubber, have low strength. [0003] In nature, the main component of the nacre on the shell is calcium carbonate (95% volume fraction), but the strength and toughness of calcium carbonate are very low, but through the mineralization of nature, an org...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08L1/28C08K3/34C08K3/04
Inventor 姜义军王诚徐国强孙孟清
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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