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Polyvinyl alcohol/graphene composition microporous foaming material

A technology of microcellular foaming material and polyvinyl alcohol, which is applied in the field of polymer microcellular foaming materials, can solve the problems of comprehensive performance and mechanical properties lower than expected, low solubility of carbon dioxide, weak melt strength, etc., to achieve improved foam Pore ​​nucleation rate, superior mechanical properties, and the effect of reducing the free energy barrier

Inactive Publication Date: 2019-03-01
宁波致微新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, in the supercritical carbon dioxide foaming process, polyvinyl alcohol is affected by factors such as inherent viscoelasticity, weak melt strength, low solubility of carbon dioxide and low nucleation efficiency, and it is difficult to obtain foams with high cell density and not easy to collapse.
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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  • Polyvinyl alcohol/graphene composition microporous foaming material
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  • Polyvinyl alcohol/graphene composition microporous foaming material

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preparation example Construction

[0016] The preparation method of isocyanate-based graphene can be as follows, using 500mL ethanol and 500mL distilled water as a mixed solvent, adding 2g graphene to the above mixed solvent and ultrasonically dispersing it evenly, then adding 1~10mL silane coupling agent and 5~ 30mL of ammonia water, mechanically stirred at room temperature for 6-12h, then centrifuged the mixed solution, washed the obtained precipitate with distilled water and absolute ethanol for 3-5 times, and finally vacuum-dried the product at 60-80°C to obtain isocyanate-based graphene.

[0017] When the polyvinyl alcohol in the polyvinyl alcohol / graphene composition is 100 parts by mass, the isocyanate-based graphene is 0.1-5.0 parts by mass. As the content of isocyanate-based graphene increases, the free energy barrier for cell nucleation decreases, increasing the heterogeneous nucleation sites, increasing the cell nucleation rate, thereby increasing the cell density and reducing the cell size, so the lo...

Embodiment 1

[0052] Using 500mL ethanol and 500mL distilled water as a mixed solvent, add 2g hydroxygraphene to the above mixed solvent and ultrasonically disperse it evenly, then add 2.5mL 3-isocyanatopropyltriethoxysilane and 10mL ammonia water, at room temperature Stir mechanically for 12 hours, then centrifuge the mixed solution, wash the obtained precipitate with distilled water and absolute ethanol for 5 times, and finally dry the product in vacuum at 60° C. to obtain isocyanate-based graphene.

[0053] Obtain the plasticizer by mixing glycerin and pentylene glycol in a ratio of 1:1, disperse 1.0g of isocyanate-based graphene in 14g of plasticizer, stir ultrasonically, and then mix 85g of polyvinyl alcohol powder (PVA1799, alcoholysis The density is 99%, Hengrui Chemical Industry) was added therein, and stirred vigorously at 60° C. for 1 h to obtain a polyvinyl alcohol / graphene composition. A sheet of polyvinyl alcohol / graphene composition with a thickness of 0.5 cm was obtained by a...

Embodiment 2

[0058] Obtain plasticizer by mixing glycerol and pentylene glycol in the ratio of 1: 1, the isocyanate base graphene that 1.0g embodiment 1 is made and 0.5g ruthenium nitrate are dispersed in 14g plasticizer, ultrasonic stirring, then again 85g of polyvinyl alcohol powder (PVA1799, alcoholysis degree of 99%, Hengrui Chemical Industry) was added thereinto, and vigorously stirred at 60° C. for 1 h to obtain a polyvinyl alcohol / graphene composition. A sheet of polyvinyl alcohol / graphene composition with a thickness of 0.5 cm was obtained by a screw extruder.

[0059] The sheet polyvinyl alcohol / graphene composition (4cm × 4cm × 0.5cm) is placed in a high-pressure mold, heated to a saturation temperature of 145°C, filled with supercritical carbon dioxide to a saturation pressure of 14MPa, Then heat-preservation and pressure-holding, heat-preservation and pressure-holding for 60 minutes, and then pressure relief to prepare a polyvinyl alcohol / graphene composition microporous foam m...

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Abstract

The invention relates to a polyvinyl alcohol / graphene composition microporous foaming material which has good cell stability and is not prone to collapse. The foaming material is prepared from a polyvinyl alcohol / graphene composition by a supercritical fluid foaming technique, wherein the composition comprises polyvinyl alcohol, isocyanate-based graphene and plasticizer. Preferably, the composition comprises, by mass, 100 parts of polyvinyl alcohol, 0.1 to 5.0 parts of isocyanate-based graphene, and 5 to 30 parts of plasticizer. Compared with a pure polyvinyl alcohol foaming material, the polyvinyl alcohol / graphene composition microporous foaming material has the following advantages: the isocyanate-based graphene can reduce the free energy barrier of cell nucleation, provide a heterogeneous nucleation site for the foaming of polyvinyl alcohol, and increase the cell nucleation rate, cells are not prone to collapse during the foaming process, and the mechanical properties are superior than those of pure polyvinyl alcohol foam.

Description

technical field [0001] The invention relates to a polymer microporous foaming material, more particularly to a polyvinyl alcohol / graphene composite microporous foaming material with good cell stability and low 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 an environmentally friendly material, with a large number of...

Claims

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Application Information

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IPC IPC(8): C08L29/04C08K9/06C08K3/04C08K5/053C08J9/12
CPCC08J9/0023C08J9/009C08J9/0095C08J9/122C08J2203/06C08J2203/08C08J2329/04C08K3/042C08K5/053C08K9/06
Inventor 闫海阔李英赵玲
Owner 宁波致微新材料科技有限公司
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