Bacterial cellulose/polymer composite film and preparation method thereof

A technology of bacterial cellulose and polymer, applied in the direction of fiber type, fiber treatment, textile and papermaking, etc., can solve the problem of the porosity, air permeability and liquid absorption rate of porous polymer membrane, and insufficient liquid retention performance of porous polymer membrane Ideal, uneven pore size distribution of porous polymer membranes, etc., to achieve the effect of improving filtration effect and air permeability, excellent mechanical properties, and easy industrial production

Inactive Publication Date: 2011-11-23
DONGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The pore size distribution of porous polymer membranes is uneven, and the size and distribution of micropores will affect the porosity, air permeability and liquid absorption rate of porous polymer membranes, and the liquid retent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment １

[0031] (1) The process of strain activation is as follows: absorb 0.3ml of liquid medium with a sterile pipette, drop it into the ampoule bottle containing Acetobacter xylinum strain, shake gently, the freeze-dried bacteria are suspended, absorb all the bacteria Suspension, transplanted on the slant medium, cultured at 25°C for 1 day, transferred to the same slant medium, transferred once every other day, and repeated 5 times to complete the activation process of the strain;

[0032] (2) Use an inoculation loop to pick a ring of activated slant strains and insert them into the seed culture medium, stir and cultivate for 18 hours at 25°C under a magnetic stirrer with a rotation speed of 200r / min, and then put them into the liquid medium for shaking The surface of the porous polyethylene membrane was soaked in liquid medium at 25°C and exposed to the air for 7 days. The pore size of the porous polymer membrane is 0.02~10μm, and the porosity is 30%;

[0033] (3) Repeat the opera...

Embodiment 2

[0039](1) The process of strain activation is as follows: absorb 0.4ml of liquid medium with a sterile pipette, drop it into the ampoule bottle rich in Acetobacter strains, shake gently, the freeze-dried bacteria are suspended, absorb all the bacteria to suspend transplanted on the slant medium, cultured at 28°C for 2 days, transferred to the same slant medium, transferred every 2 days, and repeated 6 times to complete the activation process of the strain;

[0040] (2) Use an inoculation loop to pick a ring of activated slant strains and insert them into the seed culture medium, stir and cultivate for 20 hours at 28°C under a magnetic stirrer with a rotation speed of 250r / min, and then put them into the liquid medium for shaking. The surface of the porous polypropylene membrane was soaked in the liquid medium at 28°C and exposed to the air for 8 days. The porous polypropylene membrane has a pore size of 5-20 μm and a porosity of 35%;

[0041] (3) Repeat the operation step (2)...

Embodiment 3

[0047] (1) The process of strain activation is as follows: absorb 0.5ml of liquid medium with a sterile pipette, drop it into the ampoule bottle containing Acetobacter strains, shake gently, the freeze-dried bacteria are suspended, absorb all the bacteria Suspension, transplanted on the slant medium, cultured at 30°C for 2 days, transferred to the same slant medium, transferred once every 2 days, and repeated 7 times to complete the activation process of the strain;

[0048] (2) Use an inoculation loop to pick a circle of activated slant strains and insert them into the seed culture medium, stir and cultivate for 22 hours at 30°C under a magnetic stirrer with a rotation speed of 300r / min, and then put them into the liquid medium for shaking The surface of the porous polyamide membrane was soaked in liquid medium at 30°C and exposed to the air for 9 days. The porous polyamide membrane has a pore size of 10~30μm and a porosity of 40%;

[0049] (3) Repeat the operation step (2) ...

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Abstract

The invention relates to a bacterial cellulose/polymer composite film and a preparation method thereof. The bacterial cellulose/polymer composite film is formed by compounding bacterial cellulose fibers on a polymer porous material in situ. The method comprises the following steps of: (1) activating strains, finally inoculating into a liquid culture medium to culture, infiltrating the surface of the porous polymer film in the liquid culture medium and exposing in air; (2) repeating the operation every 2-3 days until a composite film is formed; (3) post-treating the composite film to be neutral to obtain a bacterial cellulose/polymer composite gel film; and (4) drying the gel film obtained in the step (3) to constant weight to obtain the bacterial cellulose/polymer composite dry film. The invention solves the problem of low mechanical strength of a single bacterial cellulose film. By utilizing hydrogen bonding produced by hydroxyl groups on cellulose macromolecules, the strength, the durability and the water absorbability of the bacterial cellulose/polymer composite gel film and the composite dry film are improved.

Description

technical field [0001] The invention relates to a bacterial cellulose composite membrane and a preparation method thereof, in particular to an in-situ composite bacterial cellulose composite membrane and a preparation method thereof, in particular to a bacterial cellulose fiber on a polymer porous material Bacterial cellulose composite membrane formed by in-situ composite and its preparation method. Background technique [0002] Bacterial cellulose is a new type of biomaterial with many unique properties: (1) high elastic modulus, tensile strength and excellent shape maintenance ability; (2) ultra-fine three-dimensional network structure, bacterial cellulose is composed of Microfibers with a diameter of 3-4nm are combined into fiber bundles of 40-60nm and interwoven; (3) have high biocompatibility, adaptability and good biodegradability. [0003] Due to its unique weave structure, bacterial cellulose has been widely used in medical materials and food industry. Mechanical p...

Claims

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Application Information

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IPC IPC(8): C08J9/42C08L23/06C08L23/12C08L77/00C08L27/18C08L27/16D06M15/05D06M101/20D06M101/34D06M101/22
Inventor 尹璐王彪王华平
Owner DONGHUA UNIV
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