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Preparation method of antibacterial and hydrophobic biodegradable membrane

A degradable membrane and hydrophobic technology, applied in the field of composite membrane, can solve the problems of insignificant bacteriostatic effect, poor water resistance, poor mechanical properties, etc., and achieve good biodegradability, simple reaction operation, and elimination of acid corrosion loss.

Inactive Publication Date: 2017-05-17
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single sodium carboxymethyl cellulose film is brittle, has poor water resistance, and has no obvious antibacterial effect, which limits its application in fresh-keeping.
Although there have been reports on the blending of sodium alginate and sodium carboxymethyl cellulose to make food packaging films, the blended films of sodium alginate and sodium carboxymethyl cellulose have poor mechanical properties and can only be made in some cases. inner packaging of food

Method used

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  • Preparation method of antibacterial and hydrophobic biodegradable membrane
  • Preparation method of antibacterial and hydrophobic biodegradable membrane
  • Preparation method of antibacterial and hydrophobic biodegradable membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The modified chitosan used in the following examples was prepared according to the following steps:

[0046] In a 100 mL single-necked flask were added 20 g of ionic liquid 1-butyl-3-methylimidazole bromide and 0.5 g of chitosan with a viscosity of 300 mPa.s. The chitosan was pretreated with hydrobromic acid. It is made by freeze-drying. The single-necked flask is evacuated and sealed. Under the condition of 0.06 MPa negative pressure, it is stirred evenly, and it is placed in an oil bath at 100 ℃ and stirred for 4 h at a constant temperature. After observing the complete dissolution of chitosan through a polarizing microscope, add 2,3-epoxypropyl with n (alkyl quaternary ammonium salt): n (chitosan) of 6:1 and epoxy equivalent of 0.85 to the one-necked flask Trimethylammonium chloride (GTMAS), re-maintain the negative pressure of 0.06 MPa and place the single-neck flask in an oil bath at 80 ℃ for constant temperature reaction for 8 hours to ensure the full reaction of chi...

Embodiment 2

[0051] Weigh a certain amount of HTCC powder and CMC powder with a degree of substitution of 0.56, respectively add a certain amount of deionized water to them, swell at a constant temperature in a water bath at 60 ℃ for a certain period of time, then stir until uniform, and place at room temperature after stirring. After 24 h, the HTCC solution with a mass fraction of 2% and the CMC solution with a mass fraction of 2% were finally obtained respectively;

[0052] Weigh the above configured HTCC solution and CMC solution at a solute mass ratio of 0.5:10, and mix them in a water bath at 25 ℃ to obtain a uniform HTCC / CMC aqueous solution, and then pour the mixed solution into the membrane tool to make the mixed solution The thickness of the HTCC / CMC composite film is as uniform as possible and placed in a blast drying oven at 45 ℃ for 24 hours. After the solvent is completely evaporated, a dry HTCC / CMC composite film is obtained.

[0053] The composite film prepared in this example ha...

Embodiment 3

[0055] The implementation conditions and steps are the same as in Example 2, except that the solute mass ratio of the configured HTCC solution to the CMC solution is replaced with 1:10.

[0056] The composite film prepared in this example has good light transmittance. The cut surface of the film and the Fourier change infrared spectrum show that there is good compatibility and significant interaction between HTCC molecules and CMC molecules in the composite film; The tensile strength of the film is 28.56 MPa, which is 139% higher than that of the pure CMC film; the elongation at break is 2.86%; the contact angle of water in the composite film is 90 o , Greater than the contact angle of pure CMC membrane, showing good hydrophobicity; HTCC / CMC composite membrane has a diameter of 1.28 cm for Staphylococcus aureus and 1.03 cm for E. coli.

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Abstract

The invention provides a preparation method of an antibacterial and hydrophobic biodegradable membrane. The preparation method comprises the following steps: 1) weighing a certain amount of modified chitosan powder and sodium carboxymethyl cellulose powder; adding a certain amount of de-ionized water into the powder respectively; swelling at constant temperature and stirring uniformly; placing for 24h at a room temperature, so as to finally obtain a modified chitosan solution and a sodium carboxymethyl cellulose solution; 2) mixing the two prepared solutions at a certain mass ratio and mixing under a certain condition to prepared a uniform water solution; pouring the mixed solution into a mold and putting the mold into an air blowing drying box; drying to obtain a modified chitosan / sodium carboxymethyl cellulose composite membrane. Compared with the prior art, the preparation method of the antibacterial and hydrophobic biodegradable membrane, provided by the invention, is simple to operate and has no corrosion to equipment; the composite membrane prepared by the invention has good biodegradability, sterilization and bacterium-inhibition performances and hydrophobic property; meanwhile, the tensile strength and the elongation at break are remarkably increased.

Description

Technical field [0001] The invention relates to the technical field of composite membranes, in particular to a preparation method of an antibacterial hydrophobic biodegradable membrane. Background technique [0002] For a long time, oil-based films have dominated food packaging and other industrial fields, such as biomedicine, wastewater treatment, and cosmetics. Although they have good mechanical properties and toughness, the preparation process is simple and cheap, but the synthetic polymers are difficult to degrade and cause serious pollution to the environment, so more researchers have used degradable polymers to prepare them. [0003] Chitosan is a natural biodegradable material that is widely used in agriculture, food, cosmetics, printing and dyeing, medicine and other fields. Chitosan is a deacetylated derivative of chitin, and chitin is the main component of the cell walls of crustaceans and insects. Its output is second only to cellulose and is the second largest renewabl...

Claims

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Application Information

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IPC IPC(8): C08L1/28C08L5/08C08L5/04C08J5/18C08B37/08B65D65/46
CPCB65D65/466C08B37/003C08J5/18C08J2301/28C08J2305/04C08J2405/08C08L1/286C08L5/04C08L2201/06C08L2203/16C08L2205/02C08L5/08Y02W90/10
Inventor 杨效登乔从德王贝贝李燕李天铎
Owner QILU UNIV OF TECH
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