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Preparation method of polyvinyl alcohol/hydroxyapatite microcellular foaming material

A microcellular foaming material and polyvinyl alcohol technology are applied in the field of preparation of polyvinyl alcohol/hydroxyapatite microcellular foaming materials, which can solve the problems of lower comprehensive performance and mechanical properties than expected values, etc. Nucleation rate, not easy to collapse, the effect of superior mechanical properties

Inactive Publication Date: 2019-03-15
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/hydroxyapatite microcellular foaming material
  • Preparation method of polyvinyl alcohol/hydroxyapatite microcellular foaming material

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preparation example Construction

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

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

[0017] Step 2: Preparation of a polyvinyl alcohol composition, the polyvinyl alcohol composition comprising polyvinyl alcohol, the polar group-containing hydroxyapatite prepared in step 1 and a plasticizer, the polyvinyl alcohol in the polyvinyl alcohol composition For 100 parts by mass, 0.1-5.0 parts by mass of hydroxyapatite containing polar groups, and 5-30 parts by mass of plasticizer;

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

Embodiment 1

[0068] Using 500mL of ethanol and 500mL of distilled water as a mixed solvent, add 2g of hydroxyapatite (average particle size 80nm) to the above mixed solvent and ultrasonically disperse it evenly, then add 2.5mL of 3-aminopropyltrimethoxysilane and 10mL of ammonia water , stirred mechanically at room temperature for 12 hours, then centrifuged the mixed solution, washed the obtained precipitate with distilled water and absolute ethanol for 5 times, and finally dried the product in vacuum at 60°C to obtain amino-containing hydroxyapatite.

[0069] The plasticizer is obtained by mixing glycerin and pentylene glycol in a ratio of 1:1, dispersing 0.8g of amino-containing hydroxyapatite in 14g of plasticizer, stirring ultrasonically, and then adding 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...

Embodiment 2

[0074] Using 500mL ethanol and 500mL distilled water as a mixed solvent, add 2g of hydroxyapatite to the above mixed solvent and ultrasonically disperse it evenly, then add 2.5mL 3-(2,3-glycidyloxy)propyltrimethoxy Silane and 10mL ammonia water were mechanically stirred at room temperature for 12h, and 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 hydroxyapatite .

[0075] The plasticizer is obtained by mixing glycerin and pentylene glycol in a ratio of 1:1, dispersing 0.8g of epoxy-containing hydroxyapatite in 14g of plasticizer, stirring ultrasonically, and then adding 85g of polyvinyl alcohol powder (PVA1799, the degree of alcoholysis is 99%, Hengrui Chemical Industry) was added thereinto, and vigorously stirred at 60° C. for 1 hour to obtain a polyvinyl alcohol composition. A sheet of polyvinyl alcohol composition hav...

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Abstract

The invention relates to a preparation method of a polyvinyl alcohol / hydroxyapatite microcellular foaming material which is good in cell stability and unlikely to collapse. The preparation method comprises the following three steps: (1) preparation of hydroxyapatite containing a polar group; (2) preparation of a polyvinyl alcohol composition, wherein the polyvinyl alcohol composition comprises polyvinyl alcohol, the hydroxyapatite containing the polar group prepared in step 1 and a plasticizer; and (3) placing the polyvinyl alcohol composition in a high-pressure mold, and preparing the polyvinyl alcohol microcellular foaming material by a specific process. The method has the advantages that by the hydroxyapatite containing the polar group, 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 in a foaming process, and compared with pure polyvinyl alcohol foam, the polyvinyl alcohol / hydroxyapatite microcellular foaming material has more excellent mechanical property.

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 / hydroxyapatite 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 alcoh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12C08L29/04C08K3/32
CPCC08J9/0066C08J9/122C08J2203/06C08J2203/08C08J2329/04
Inventor 陈丽娜张利
Owner NINGBO UNIV
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