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Preparation method of polyvinyl alcohol/carbon nanotube microporous foaming material

A technology of microcellular foaming material and polyvinyl alcohol, which is applied in the field of preparation of polyvinyl alcohol/carbon nanotube microcellular foaming material, can solve the problems of lower comprehensive mechanical properties than expected values, etc. Nuclear rate, superior mechanical properties, the effect of reducing the free energy barrier

Inactive Publication Date: 2019-02-01
ZHEJIANG TEXTILE & FASHION COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the polyvinyl alcohol foam prepared under relatively high pressure and temperature tends to collapse within a few hours, and its comprehensive properties such as mechanical properties of cell density are still lower than expected values

Method used

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  • Preparation method of polyvinyl alcohol/carbon nanotube microporous foaming material
  • Preparation method of polyvinyl alcohol/carbon nanotube microporous foaming material
  • Preparation method of polyvinyl alcohol/carbon nanotube microporous foaming material

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preparation example Construction

[0015] The present invention relates to a preparation method of polyvinyl alcohol / carbon nanotube microporous foaming material, comprising step 1, step 2 and step 3;

[0016] Step 1: Preparation of carbon nanotubes containing polar groups, the polar groups being one or both of amino groups and epoxy groups;

[0017] Step 2: Preparation of polyvinyl alcohol composition, the polyvinyl alcohol composition comprises polyvinyl alcohol, the carbon nanotubes containing polar groups prepared in step 1 and plasticizer, the polyvinyl alcohol in the polyvinyl alcohol composition is For 100 parts by mass, the carbon nanotubes containing polar groups are 0.1-5.0 parts by mass, and the plasticizer is 5-30 parts by mass;

[0018] Step 3: Place the polyvinyl alcohol composition in a high-pressure mold, raise the temperature to the saturation temperature, the saturation temperature is 130°C-165°C, fill the supercritical fluid to the saturation pressure, the saturation pressure is 10-18MPa, kee...

Embodiment 1

[0067] Using 500mL of ethanol and 500mL of distilled water as a mixed solvent, add 2g of hydroxyl carbon nanotubes to the above mixed solvent and disperse it evenly by ultrasonication, then add 2.5mL of 3-aminopropyl trimethoxy silicon and 10mL of ammonia water, and mechanically stir at room temperature After 12 hours, the mixed solution was centrifuged, and the obtained precipitate was washed 5 times with distilled water and absolute ethanol, and finally the product was vacuum-dried at 60° C. to obtain amino group-containing carbon nanotubes.

[0068] Obtain the plasticizer by mixing glycerin and pentylene glycol in a ratio of 1:1, disperse 0.8g of amino-containing carbon nanotubes in 14g of plasticizer, stir ultrasonically, and then add 85g of polyvinyl alcohol powder (PVA1799, The degree of alcoholysis is 99%, Hengrui Chemical Industry) was added thereto, and stirred vigorously at 60° C. for 1 hour to obtain a polyvinyl alcohol composition. A sheet of polyvinyl alcohol comp...

Embodiment 2

[0073] Using 500mL of ethanol and 500mL of distilled water as a mixed solvent, add 2g of hydroxyl carbon nanotubes to the above mixed solvent and ultrasonically disperse it evenly, then add 2.5mL of 3-(2,3-glycidoxy)propyltrimethoxy Silane and 10 mL of ammonia water were mechanically stirred at room temperature for 12 hours, and then the mixed solution was centrifuged, and the obtained precipitate was washed 5 times with distilled water and absolute ethanol, and finally the product was vacuum-dried at 60°C to obtain epoxy-containing carbon nanotubes.

[0074] The plasticizer is obtained by mixing glycerin and pentylene glycol in a ratio of 1:1, dispersing 0.8 g of epoxy-containing carbon nanotubes in 14 g of plasticizer, stirring ultrasonically, and then adding 85 g of polyvinyl alcohol powder (PVA1799, the degree of alcoholysis is 99%, Hengrui Chemical Industry) was added thereto, and vigorously stirred at 60° C. for 1 hour to obtain a polyvinyl alcohol composition. A sheet o...

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Abstract

The invention relates to a preparation method of a polyvinyl alcohol / carbon nanotube microporous foaming material which is good in bubble pore stability and not easy to collapse. The preparation method comprises three steps: (1) preparing carbon nanotubes containing polar groups; (2) preparing a polyvinyl alcohol composition, wherein the polyvinyl alcohol composition includes polyvinyl alcohol, the carbon nanotubes containing the polar groups and prepared in the step 1, and a plasticizer; and (3) placing the polyvinyl alcohol composition in a high-pressure mould and preparing the polyvinyl alcohol microporous foaming material by specific processes. The method has the following advantages: the carbon nanotube containing the polar groups can reduce the free energy barrier of nucleation of bubble pores, provides heterogeneous nucleation sites for polyvinyl alcohol foaming, increases the nucleation rate of the bubble pores, and has the bubble pores not easy to collapse during foaming process, and has superior mechanical properties than pure polyvinyl alcohol foams.

Description

technical field [0001] The invention relates to a preparation method of a polyvinyl alcohol microporous foaming material, in particular to a preparation method of a polyvinyl alcohol / carbon nanotube microporous foaming material with good cell stability and not easy to collapse. Background technique [0002] Polymer microcellular foaming material is a material with superior performance. It has the advantages of light weight, heat insulation, sound insulation, cushioning, high specific strength, and low price. Therefore, it is widely used in packaging, industry, agriculture, transportation, and military industries. , aerospace industry and other fields have been widely used. Commonly used polymer foams are mostly made of petroleum-based resins, such as polypropylene, polyethylene, polystyrene, polyurethane, and polyvinyl chloride. With the increasing awareness of environmental protection, biodegradable polymer foams are gaining more and more attention. Polyvinyl alcohol (PVA...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08J9/12C08J9/00
CPCC08J9/0071C08J9/122C08J2203/06C08J2203/08C08J2329/04
Inventor 赵宝艳吴超林玲
Owner ZHEJIANG TEXTILE & FASHION COLLEGE
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