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A preparation method of fully open-cell polymer foam material and corresponding foam material

A technology of foaming materials and polymers, which is applied in the field of polymer materials, can solve the problems of restricting the application range of foaming technology, the difficulty of opening pores or the opening rate on the surface of polymer foaming materials, and avoiding cost and environmental pollution. Good surface opening effect and good connectivity

Active Publication Date: 2020-06-05
塑凡新材料科技(上海)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 traditional supercritical fluid foaming process, due to the large temperature gradient between the surface layer of the polymer material and the interior of the center, that is, the surface temperature is low, while the temperature inside the material is high, resulting in CO 2 The gas cannot dissolve (or dissolves less) into the surface layer of the material, thereby forming a dense and hard skin layer on the surface, wrapping the internal porous structure, making it difficult to open pores on the surface of the polymer foam material or the opening rate is low, which seriously restricts this development. Therefore, an improved solution is urgently needed to overcome this defect

Method used

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  • A preparation method of fully open-cell polymer foam material and corresponding foam material
  • A preparation method of fully open-cell polymer foam material and corresponding foam material
  • A preparation method of fully open-cell polymer foam material and corresponding foam material

Examples

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Effect test

Embodiment 1

[0028] Example 1 Preparation of polycaprolactone (PCL) fully open-cell foaming material

[0029] A preparation method for a fully open-cell polymer foam material, comprising the following steps:

[0030] (1) Two polymers, PCL (number average molecular weight 50,000) and PEO (number average molecular weight 100,000), are melt-blended, extruded, and granulated on a twin-screw extruder at a weight ratio of 70:30, and PEO is dispersed phase form, use a vacuum tablet press to press the PCL / PEO blend particles into a film (green body) with a thickness of 180 μm, and dry it in a vacuum drying oven for 24 hours to ensure that there is no residual moisture;

[0031] (2) Weigh 25g of PEO, put it into 75ml of deionized water, seal it and stir at 25°C for 24 hours; after obtaining a completely dissolved PEO solution with a concentration of 25WT%, use a mold to evenly coat it on PCL / PEO (70 / 30) the surface of the film material to obtain a protective body with a thickness of 20 μm PEO prot...

Embodiment 2

[0038] Example 2 Preparation of polycaprolactone (PCL) fully open-cell foaming material

[0039] A preparation method for a fully open-cell polymer foam material, comprising the following steps:

[0040] (1) First, two polymers, PCL (number average molecular weight 50,000) and PEO (number average molecular weight 100,000) are melt-blended, extruded, and granulated on a twin-screw extruder at a weight ratio of 50:50. It exists in the form of a continuous phase. Use a vacuum tablet press to press the PCL / PEO blend particles into a film (green body) with a thickness of 200 μm, and dry it in a vacuum drying oven for 24 hours to ensure that there is no residual moisture;

[0041] (2) Weigh 10g of PEO, put it into 90ml of deionized water, seal it and stir it at 25°C for 24 hours to obtain a completely dissolved PEO solution with a concentration of 10WT%, and use a mold to evenly coat it on PCL / PEO (50 / 50) the surface of the film material to obtain a protective green body with a thi...

Embodiment 3

[0048] Example 3 Preparation of polycaprolactone / polylactic acid (PCL / PLA) fully open-cell foaming material

[0049] (1) First, two polymers, PCL (number average molecular weight 50,000) and PLA (weight average molecular weight 130,000) are melt-blended, extruded, and granulated on a twin-screw extruder at a weight ratio of 70:30. The vacuum tablet press presses the PCL / PLA blended material into a film (green body) with a thickness of 300 μm, and dries it in a vacuum drying oven for 24 hours to ensure that there is no residual moisture;

[0050] (2) Weigh 10g of PEO, put it into 90ml of deionized water, seal it and stir it at 25°C for 24h to obtain a completely dissolved PEO solution with a concentration of 10WT%, and use a mold to evenly coat it on the PCL / PLA co- The surface of the mixture film was obtained to obtain a protective body with a PEO protective layer with a thickness of 10 μm on the surface; it was put into an oven, dried at 25°C for 2 days, and then taken out; ...

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Abstract

The invention belongs to the field of high-polymer materials, and discloses a preparing method of a full-cell polymer foaming material and the foaming material prepared through the method. The methodincludes the following steps of firstly, selecting a non-water-soluble thermoplastic polymer or a mixture of the non-water-soluble thermoplastic polymer and a water-soluble thermoplastic polymer to prepare a blank; secondly, coating the surface of the blank with a water solution of the water-soluble thermoplastic polymer to prepare a protection blank; thirdly, conducting supercritical fluid foaming on the protection blank to prepare a foaming blank; fourthly, conducting leaching and drying on the foaming blank to prepare the finished product. The size of cells in the surface of the prepared foaming material is 5-20 micron, and the cell density is not lower than 1.0*10<7> cell / cm<3>. Compared with the prior art, the surface porosity is high, the internal cell structure is not broken, and the material is free of pollution, environmentally friendly and low in production cost.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a method for preparing a fully open-cell polymer foam material and a fully open-cell foam material prepared by the method. Background technique [0002] Polymer foam material refers to a microporous material based on polymer (plastic, rubber, elastomer or natural polymer material) with numerous bubbles inside, and can also be regarded as a composite material filled with gas. Open-cell polymer foam materials are widely used in the fields of biology, medical treatment, and environmental engineering. They can be used in tissue engineering, solvent extraction, thermal insulation, sound absorption, water stop and water retention, oil absorption, and drug controlled release. [0003] supercritical fluid (N 2 , CO 2 etc.) Foaming technology has attracted more and more attention in the preparation of porous tissue engineering scaffold materials due to its green and pollutio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/26C08J9/12C08L67/04
CPCC08J9/122C08J9/26C08J2201/0464C08J2203/06C08J2203/08C08J2205/044C08J2205/05C08J2367/04C08J2467/04C08J2471/02
Inventor 蒋晶李倩张康康孙书豪王小峰侯建华徐轶洋
Owner 塑凡新材料科技(上海)有限公司
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