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Multilayer polymer foam material and preparation method thereof

A foaming material and polymer technology, applied in the field of multi-layer polymer foaming materials and their preparation, can solve the problems of high expansion ratio, layer-to-layer separation, interlayer bubbles, etc., and achieve good mechanical properties and large expansion ratio. , the effect of the simple method

Pending Publication Date: 2021-10-26
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method uses two different polymers. Since most of the polymers are incompatible, it is easy to cause layer separation or interlayer bubble defects during the foaming process, which is not conducive to multilayer polymers. Properties of foamed materials
In addition, the cell growth of the foamed layer is also restricted by the solid layer, resulting in the inability of the foamed layer to achieve a high expansion ratio.

Method used

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  • Multilayer polymer foam material and preparation method thereof
  • Multilayer polymer foam material and preparation method thereof
  • Multilayer polymer foam material and preparation method thereof

Examples

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preparation example Construction

[0025] The preparation method of multilayer polymer foam material provided by the invention comprises:

[0026] S1, providing a first polymer and nanoparticles, mixing the first polymer and the nanoparticles to obtain a mixture;

[0027] S2, providing a second polymer, and forming the second polymer and the mixture into a sheet structure through a multilayer co-extrusion method, wherein the sheet structure includes at least one second polymer layer and at least one hybrid layer, and the second polymer is a polymer of the same monomer as the first polymer;

[0028] S3, foaming the sheet structure, foaming the mixed layer in the sheet structure to form a foam layer, to obtain a multilayer polymer comprising at least one film layer and at least one foam layer foaming material.

[0029] In step S1, the first polymer includes one of polypropylene, polyethylene, polystyrene, polymethyl methacrylate, polylactic acid, polyolefin elastomer, and polycarbonate.

[0030] The nanopartic...

Embodiment 1

[0065] Blending the nano-silica and the first polystyrene to obtain a mixture, wherein the mass percentage of the nano-silica is 0.1 wt%.

[0066] The second polystyrene and the mixture are made into a sheet with a width of 5 cm, a thickness of about 1 mm, and 128 layers through a multi-layer co-extrusion device. The thickness of the polystyrene layer in the sheet is 5.5 μm, and the thickness of the mixed layer is The thickness is 10.1 μm, and the polystyrene layer and the mixed layer are alternately stacked and distributed, and the melt index difference between the second polystyrene and the first polystyrene is 4.5.

[0067] Put the sheet in an autoclave for saturation, the saturated gas is carbon dioxide, the saturation pressure is 2MPa, the saturation time is 72h, and the temperature of the autoclave is 25°C. After the saturation is completed, the sheet that has reached the saturation pressure is taken out and placed in Foaming is carried out in simethicone oil at a temper...

Embodiment 2

[0069] Blending the nano-calcium carbonate and the first polypropylene to obtain a mixture, wherein the mass percentage of the nano-calcium carbonate is 1 wt%.

[0070] The second polypropylene and the mixture are made into a sheet with a width of 10 cm, a thickness of 2 mm, and 32 layers through a multilayer co-extrusion device. The thickness of the polypropylene layer in the sheet is 10 μm, and the thickness of the mixed layer is 115 μm. And the polypropylene layer and the mixed layer are alternately stacked and distributed, and the difference between the melt indices of the first polypropylene and the second polypropylene is zero.

[0071] Put the sheet in an autoclave for saturation, the saturated gas is carbon dioxide, the saturation pressure is 5MPa, the saturation time is 24h, and the temperature of the autoclave is 25°C. After the saturation is completed, the sheet that has reached the saturation pressure is taken out and placed in Foaming was carried out in glycerin a...

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Abstract

The invention relates to a multilayer polymer foam material and a preparation method thereof. The preparation method comprises the following steps: providing a first polymer and nanoparticles, and mixing the first polymer and the nanoparticles to obtain a mixture; providing a second polymer, preparing lamellar structure from the second polymer and the mixture through a multi-layer co-extrusion method, wherein the lamellar structure comprises at least one second polymer layer and at least one mixed layer, and the second polymer and the first polymer are polymers with the same monomers; and foaming the lamellar structure to make the mixed layer in the lamellar structure foamed to form a foaming layer, and obtaining the multilayer polymer foam material comprising at least one thin film layer and at least one foaming layer. The preparation method disclosed by the invention is simple, and the obtained multilayer polymer foam material has no internal defects and has excellent optical and electromagnetic shielding, sound absorption, heat insulation, mechanical properties and the like.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a multilayer polymer foam material and a preparation method thereof. Background technique [0002] Polymer foamed material refers to a microporous material with polymers such as plastics, rubber, elastomers or natural polymer materials as the matrix and numerous bubbles inside, and can also be regarded as a composite material with gas as a filler. Scientific research has found that the fusion of solid material layers in polymer foamed materials can combine the advantages of the foamed layer and the solid layer, make up for the defects of a single structure, and endow the material with better performance. [0003] At present, the multi-layer polymer foam material composed of the foam layer and the solid layer is mainly prepared by a multi-layer co-extrusion method. Such as: method (1), adding a chemical foaming agent in the target foaming layer, the foaming agent decomp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/06B32B27/20B32B27/30B32B27/32B32B27/36B29C69/02B29C48/07B29C48/21B29C44/00
CPCB32B5/20B32B27/065B32B27/302B32B27/308B32B27/32B32B27/36B32B27/365B29C48/0012B29C48/07B29C48/21B29C44/00B32B2250/42B32B2250/24B32B2250/242B32B2250/244B32B2266/0228B32B2266/0242B32B2266/025B32B2266/0264B32B2264/102B32B2264/104B32B2264/108B32B2307/212B32B2307/10B32B2307/304B32B2307/40B29L2009/00
Inventor 庞永艳郭冰洁郑文革曹诣宇
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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