Preparation method of polyvinyl alcohol/graphene microcellular foam material

A technology of microcellular foaming material and polyvinyl alcohol, which is applied in the field of preparation of polyvinyl alcohol/graphene microcellular foaming material, can solve the problem that the comprehensive performance and mechanical properties are lower than the expected value, and achieve the improvement of cell nucleation The effect of high speed, not easy to collapse, and superior mechanical properties

Inactive Publication Date: 2019-02-15
NINGBO UNIV
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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/graphene microcellular foam material
  • Preparation method of polyvinyl alcohol/graphene microcellular foam material
  • Preparation method of polyvinyl alcohol/graphene microcellular foam material

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preparation example Construction

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

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

[0017] Step 2: the preparation of polyvinyl alcohol composition, polyvinyl alcohol composition comprises polyvinyl alcohol, the polar group-containing graphene and plasticizer prepared in step 1, the polyvinyl alcohol in polyvinyl alcohol composition is 100 In terms of parts by mass, the polar group-containing graphene is 0.1 to 5.0 parts by mass, and the plasticizer is 5 to 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, keep the temperature and press...

Embodiment 1

[0067] Using 500mL of ethanol and 500mL of distilled water as a mixed solvent, add 2g of hydroxygraphene to the above mixed solvent and disperse it evenly with ultrasound, then add 2.5mL of 3-aminopropyl trimethoxy silicon and 10mL of ammonia water, and mechanically stir at room temperature for 12h , 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 amino group-containing graphene.

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

Embodiment 2

[0073] Using 500mL of ethanol and 500mL of distilled water as a mixed solvent, add 2g of graphene to the above mixed solvent and ultrasonically disperse it evenly, then add 2.5mL of 3-(2,3-glycidoxy)propyltrimethoxysilane and 10mL of ammonia water was stirred mechanically at room temperature for 12h, 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 graphene containing epoxy groups.

[0074] Obtain the plasticizer by mixing glycerin and pentylene glycol in a ratio of 1:1, disperse 0.8g of epoxy-containing graphene in 14g of plasticizer, and stir ultrasonically, and then add 85g of polyvinyl alcohol powder (PVA1799 , the degree of alcoholysis is 99%, Hengrui Chemical Industry) was added therein, and vigorously stirred at 60° C. for 1 h to obtain a polyvinyl alcohol composition. A sheet of polyvinyl alcohol composition having a thicknes...

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Abstract

The invention relates to a preparation method of a polyvinyl alcohol / graphene microcellular foam material which has good foam pore stability and cannot collapse. The preparation method comprises the three steps as follows: (1) preparing graphene containing polar groups; (2) preparing polyvinyl alcohol composition comprising polyvinyl alcohol, the graphene containing the polar groups and prepared in the step 1 and a plasticizer; (3) placing the polyvinyl alcohol composition in a high-pressure mold and preparing the polyvinyl alcohol microcellular foam material with a specific process. The method has the advantages as follows: the graphene containing the polar groups can reduce free energy barrier for foam pore nucleation, provide heterogeneous nucleation sites for polyvinyl alcohol foamingand increase the foam pore nucleation rate, foam pores cannot collapse easily during foaming, and the mechanical performance is excellent than that of pure polyvinyl alcohol foam.

Description

technical field [0001] The invention relates to a preparation method of a polyvinyl alcohol microporous foaming material, and more particularly to a preparation method of a polyvinyl alcohol / graphene 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 is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L29/04C08K9/06C08K3/04C08J9/12
CPCC08J9/0066C08J9/122C08J2203/08C08J2329/04C08K3/042C08K9/06
Inventor 李德龙张利
Owner NINGBO UNIV
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