Preparation method for alternate multi-layered polymer microcellular foaming material

A microcellular foaming material and polymer technology, applied in the field of polymer foaming material preparation, can solve the problems of small cell density and expansion ratio, non-green foaming agent, poor performance, etc., and achieve a small average diameter , good foaming effect and low cost

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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a new method for preparing alternate multilayer polymer microcellular foam materials in view of the current situation of the current method for preparing alternating multilayer polymer foam materials, so as to solve the problem of existing alternate multilayer polymer foaming methods. The cell size of the material is relatively large, the cell density and expansion are relatively small, the performance is not good enough, and the foaming agent used is not environmentally friendly, etc.

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  • Preparation method for alternate multi-layered polymer microcellular foaming material

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Embodiment 1

[0025] In this embodiment, a method for preparing an alternating multilayer polymer microcellular foaming material comprises the following steps:

[0026] (1) A 32-layer polypropylene (PP) / ethylene-octene copolymer (POE) (mass ratio of 80 / 20) alternating multi-layer sheet was prepared using an alternating multi-layer co-extrusion equipment to prepare length×width×thickness About 10×5×2mm 3 The cuboid spline of ;

[0027] (2) Place the PP / POE alternating multilayer cuboid sample prepared in step (1) in an autoclave, and at a saturation temperature of 50°C and a saturation pressure of 15MPa, lead to supercritical carbon dioxide. After continuous saturation for 5 hours, the high pressure The pressure in the kettle was reduced to atmospheric pressure within 0.5s, thereby obtaining a foamed sample with alternately arranged PP solid layers and POE foamed layers. The prepared foamed sample had an average cell diameter of 2.53 μm and a cell density of 1.98×10 10 cells / cm 3 .

Embodiment 2

[0029] In this embodiment, a method for preparing an alternating multilayer polymer microcellular foaming material comprises the following steps:

[0030] (1) Prepare a 32-layer PP / POE (mass ratio of 80 / 20) alternating multi-layer sheet using an alternating multi-layer co-extrusion equipment, and prepare a length×width×thickness of about 10×5×2mm 3 The cuboid spline of ;

[0031] (2) Place the PP / POE alternating multilayer cuboid sample prepared in step (1) in an autoclave, and at a saturation temperature of 60°C and a saturation pressure of 15MPa, lead to supercritical carbon dioxide. After continuous saturation for 5 hours, the high pressure The pressure in the kettle was reduced to atmospheric pressure within 0.5s, thereby obtaining a foamed sample with alternately arranged PP solid layers and POE foamed layers. The average cell diameter of the prepared foam sample is 2.4 μm, and the cell density is 2.1×1010cells / cm 3 . Compared with Example 1, the average cell diameter ...

Embodiment 3

[0033] In this embodiment, a method for preparing an alternating multilayer polymer microcellular foaming material comprises the following steps:

[0034] (1) Prepare a 32-layer PP / POE (mass ratio of 80 / 20) alternating multi-layer sheet using an alternating multi-layer co-extrusion equipment, and prepare a length×width×thickness of about 10×5×2mm 3 The cuboid spline of ;

[0035] (2) Place the PP / POE alternating multilayer cuboid sample prepared in step (1) in an autoclave, and at a saturation temperature of 70°C and a saturation pressure of 15MPa, lead to supercritical carbon dioxide. After continuous saturation for 5 hours, the high pressure The pressure in the kettle was reduced to atmospheric pressure within 0.5s, thereby obtaining a foamed sample with alternately arranged PP solid layers and POE foamed layers. The average cell diameter of the prepared foamed sample is 2.21 μm, and the cell density is 2.72×10 10 cells / cm 3 . Compared with Examples 1 and 2, the average ...

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Abstract

The invention discloses a preparation method for an alternate multi-layered polymer microcellular foaming material. The preparation method comprises the steps of: selecting a physical layer raw material and a foaming layer raw material with difference of a certain Vicat softening point or a melting point; forming the raw materials into a sample with an alternate multi-layered structure; putting the sample in a high pressure kettle and introducing a supercritical fluid; maintaining the pressure for a period of time at a certain temperature; and the quickly relieving the pressure so as to obtain the polymer foaming material with the physical layers and the foaming layers which are alternately arranged. Compared with an existing alternate multi-layered co-extruding forming method by adopting a chemical foaming agent, the alternate multi-layered polymer microcellular foaming method can reduce the average cell diameter of a foamed product and improve the cell density and the expansion ratio. In addition, by taking the supercritical fluid as a foaming agent, no irritant or toxic gas will be generated in the production process, so that the method is green and environmental-friendly and relatively low in cost. The involved equipment is convenient to use, the machining process is low in energy consumption and high in efficiency, and the preparation method can realize continuous production, quantity production and large-scale production.

Description

technical field [0001] The invention relates to the technical field of polymer foaming material preparation, in particular to a method for preparing a polymer microcellular foaming material with an alternating multilayer structure. Background technique [0002] The properties of polymer foam materials (such as mechanics, sound absorption, heat insulation, dielectric, electromagnetic shielding and dimensional stability, etc.) are closely related to their cell structure (such as cell type, cell size and distribution, etc.) , therefore, how to control the cell structure in the preparation process of foamed materials is particularly critical. The cell structure of foamed materials is strongly dependent on the production method. For this reason, the academic and industrial circles continue to explore new foaming methods and technologies, study the foaming mechanism in depth, and expect to prepare high-performance and low-cost foaming materials with flexible and controllable cell...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/06B29C47/06
CPCB29C44/06B29C48/0012B29C48/21
Inventor 李为平柳和生那兵张克义周海迎汪斌
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