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Polyvinyl alcohol/ silicon dioxide composition microcellular 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: 2019-03-15
NINGBO UNIV
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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/ silicon dioxide composition microcellular foaming material
  • Polyvinyl alcohol/ silicon dioxide composition microcellular foaming material
  • Polyvinyl alcohol/ silicon dioxide composition microcellular foaming material

Examples

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preparation example Construction

[0016] The preparation method of isocyanate-based silica can be as follows, using 500mL of ethanol and 500mL of distilled water as a mixed solvent, adding 2g of silicon dioxide to the above mixed solvent and ultrasonically dispersing it evenly, then adding 1-10mL of 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 dried the product in vacuum at 60-80°C to obtain isocyanate di silicon oxide.

[0017] When the polyvinyl alcohol in the polyvinyl alcohol / silica composition is 100 parts by mass, the isocyanate-based silica is 0.1 to 5.0 parts by mass. As the content of isocyanate-based silica 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 c...

Embodiment 1

[0052] Using 500mL of ethanol and 500mL of distilled water as a mixed solvent, add 2g of silicon dioxide (average particle size 30nm) to the above mixed solvent and ultrasonically disperse it evenly, then add 2.5mL of 3-isocyanatopropyltriethoxysilane and 10mL of ammonia water, stirred mechanically at room temperature for 12h, then centrifuged the mixed solution, washed the obtained precipitate with distilled water and absolute ethanol 5 times, and finally dried the product in vacuum at 60°C to obtain isocyanate-based silica.

[0053] The plasticizer was obtained by mixing glycerin and pentylene glycol at a ratio of 1:1, dispersing 1.3 g of isocyanate-based silicon dioxide in 14 g of plasticizer, stirring ultrasonically, and then adding 85 g 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 / silicon dioxide composition. A sheet of polyv...

Embodiment 2

[0058] Obtain the plasticizer by mixing glycerin and pentylene glycol in a ratio of 1:1, disperse 1.3 g of the isocyanate-based silicon dioxide prepared in Example 1 and 0.5 g of ruthenium nitrate in 14 g of the plasticizer, stir ultrasonically, and then 85 g of polyvinyl alcohol powder (PVA1799, alcoholysis degree of 99%, Hengrui Chemical Industry) was added thereto, and vigorously stirred at 60° C. for 1 h to obtain a polyvinyl alcohol / silicon dioxide composition. A sheet of polyvinyl alcohol / silica composition having a thickness of 0.5 cm was obtained by means of a screw extruder.

[0059] Place the sheet polyvinyl alcohol / silicon dioxide composition (4cm×4cm×0.5cm) in a high-pressure mold, raise the temperature to the saturation temperature, the saturation temperature is 145°C, and fill it with supercritical carbon dioxide to the saturation pressure, the saturation pressure is 14MPa , and then heat-preservation and pressure-holding, heat-preservation and pressure-holding f...

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Abstract

The invention relates to a polyvinyl alcohol / silicon dioxide composition microcellular foaming material which is good in cell stability and is unlikely to collapse. The foaming material is prepared from a polyvinyl alcohol / silicon dioxide composition through a supercritical fluid foaming technology. The composition comprises polyvinyl alcohol, isocyanate silicon dioxide and a plasticizer, when the polyvinyl alcohol in the composition accounts for 100 parts by mass, the isocyanate silicon dioxide accounts for 0.1-5.0 parts by mass, and the plasticizer accounts for 5-30 parts by mass. Comparedwith a pure polyvinyl alcohol foaming material, the polyvinyl alcohol / silicon dioxide composition microcellular foaming material has the advantages that by the isocyanate silicon dioxide, free energy barrier of cell nucleation can be relieved, heterogeneous nucleation sites are provided for foaming of the polyvinyl alcohol, the cell nucleation rate is increased, cells are unlikely to collapse ina foaming process, and compared with pure polyvinyl alcohol foam, the polyvinyl alcohol / silicon dioxide composition microcellular foaming material has more excellent mechanical property.

Description

technical field [0001] The invention relates to a polymer microporous foaming material, in particular to a polyvinyl alcohol / silicon dioxide composition 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 an environmentally friendly material, with a la...

Claims

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Application Information

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IPC IPC(8): C08J9/12C08L29/04C08K9/06C08K3/36C08K5/053
CPCC08J9/0023C08J9/009C08J9/0095C08J9/122C08J2203/06C08J2203/08C08J2329/04
Inventor 任慧妍张利
Owner NINGBO UNIV
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