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Polyvinyl alcohol composite foam material and preparation method thereof

A polyvinyl alcohol and composite foam technology, applied in the field of nanomaterials, can solve the problems of volume reduction, disappearance, and no foam, and achieve the effects of reducing water absorption, improving mechanical properties, and strong compression resistance

Inactive Publication Date: 2014-08-06
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the prior art, polyvinyl alcohol porous foam is easy to absorb water in a relatively humid environment, so that the volume is reduced, the pores gradually disappear, and it does not have the characteristics of foam

Method used

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  • Polyvinyl alcohol composite foam material and preparation method thereof
  • Polyvinyl alcohol composite foam material and preparation method thereof
  • Polyvinyl alcohol composite foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 Preparation of Nanofiber Suspension

[0027] method one

[0028] (1) Shearing and boiling: Take 5g of paper (the composition is cellulose) and use medical scissors to cut the raw material into pieces (with a diameter less than 1mm) and put it into a three-neck flask, add 95mL of deionized water, and boil for 1 hour to obtain a slurry.

[0029] (2) Grinding: After cooling the slurry, pour it into a wet mill and grind it once (gear spacing: 0.5 μm), 2 minutes each time.

[0030] (3) Soaking and ultrasonic dispersion: Add deionized water to the milled slurry to make the mass fraction of nanofibers 5%, soak for 1 hour, and ultrasonicate twice (ultrasonic frequency 2000H z ), 2 minutes each time.

[0031] (4) High-pressure homogenization: The slurry obtained after the treatment in step (3) passes through the high-pressure homogenizer 20 times at a rate of 50ml / min at 150MPa to obtain a suspension of nanofibers, wherein the length of the nanofibers is 12- 20μm, ...

Embodiment 2

[0042] The preparation of embodiment 2 polyvinyl alcohol solution

[0043] Weigh 5g of polyvinyl alcohol (PVA) powder and place it in a three-neck flask, add 45-495mL of deionized water, and stir at 80-100°C for 0.5-3 hours at a stirring speed of 60-500r / min until completely dissolved to obtain the mass The PVA solution with a fraction of 1%-10% should be cooled and stored at low temperature (1-4°C).

Embodiment 3

[0045] Weigh the PVA solution (containing 0.8g polyvinyl alcohol) in Example 2, place it in a three-necked flask, and add the nanofiber suspension (containing 1.2g nanofibers) in Example 1 to the three-necked flask under the condition of mechanical stirring. While stirring, the temperature was raised to 80° C., and the water was evaporated until the mass of the remaining part was 40 g. Then pour the remaining part into a petri dish to cool, place it at 1-4°C for 2 days, then freeze it in a low-temperature refrigerator at -78°C for 1 day, take it out and freeze-dry it in a freeze dryer for 24 hours to obtain foam material 3. The mass percentage of nanofibers in the foam material 3 is 60%.

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Abstract

The invention provides a polyvinyl alcohol composite foam material and a preparation method thereof, and relates to the technical field of nano materials. The polyvinyl alcohol composite foam material is composed of polyvinyl alcohol and nanofiber. The preparation method of the polyvinyl alcohol composite material comprises the following steps of: adding nanofiber suspension liquid in polyvinyl alcohol liquor, evaporating a solvent under a stirring state, freezing and forming, and freezing and drying to obtain the polyvinyl alcohol composite foam material. The polyvinyl alcohol composite foam material disclosed by the invention is added with nanofiber, so that water resistance of the foam material is strengthened, and therefore, dimension stability of foams is improved; on the other hand, compression strength resistance and modulus of the foam are increased. The preparation method disclosed by the invention is carried out in a water-phase solvent without adding organic substances, and a freeze-drying method is adopted, so that process is green and pollution-free; and moreover, nanofiber in the materials is renewable resources such as cellulose, chitin, chitosan, and the like; and the composite foam is green and degradable environment-friendly material.

Description

technical field [0001] The invention relates to the field of nanometer materials, in particular to a polyvinyl alcohol porous composite foam material and a preparation method thereof. Background technique [0002] Polyvinyl alcohol is a polyhydric water-soluble polymer, which has many excellent properties such as hydrophilicity, biological activity, film-forming properties and good mechanical properties, and is non-toxic, low-cost, and biodegradable, so it is widely used in In the fields of biomedicine and packaging materials, polyvinyl alcohol foam has also received extensive attention. However, in the prior art, the polyvinyl alcohol porous foam is easy to absorb water in a relatively humid environment, so that the volume is reduced, the pores gradually disappear, and it does not have the characteristics of a foam. Contents of the invention [0003] The object of the present invention is to provide a polyvinyl alcohol composite foam material with good water resistance, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08L1/02C08L5/08C08J9/28
Inventor 刘大刚马忠实
Owner NANJING UNIV OF INFORMATION SCI & TECH
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