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Preparation method of polymer foam material

A technology for foaming materials and polymers, which is applied in the field of preparing polymer foaming materials by using supercritical fluid, can solve the problems of low production efficiency, difficult industrialization, long saturation time, etc., and achieves good foaming effect, simple process and easy operation. effect of industrialization

Inactive Publication Date: 2015-01-14
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current polymer microcellular foaming process, there are no related reports on the preparation of nanopores by extrusion and injection foaming techniques, but for polymer solid state batch foaming, there are several examples of preparing nanopores : Some people have used nano-phase-separated block copolymers to prepare nano-foamed materials through the restriction of non-foaming relative to cell growth, but this process has high requirements for the selection of block copolymer two-phase materials, and the production efficiency low, and it is difficult to industrialize; some people have prepared nanoporous polyimide foam materials by rapid heating method, but this process requires a very long saturation time, and is only suitable for high T such as polyimide. g Amorphous material of

Method used

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  • Preparation method of polymer foam material
  • Preparation method of polymer foam material
  • Preparation method of polymer foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Polyethylene terephthalate pellets with a number-average molecular weight of 40,000 and a melting point of 260°C were kneaded and extruded into a sheet by an extruder or injected into a sheet-like sample by an injection molding machine. The extruder used in this example Extruders can be different types of single-screw or twin-screw extruders, while injection molding machines can be different types of injection molding machines, and the mold of the extruder or injection molding machine can be any shape designed by oneself. By controlling the extrusion or injection molding process parameters (processing temperature of extruder is about 288 °C, screw speed is 25 rpm, or processing temperature of injection molding machine is about 280 °C), the juxtaposition of strongly oriented polymer samples is obtained In the high-pressure mold, the molding machine is closed, the mold is sealed, and then a small amount of carbon dioxide is filled to purge the high-pressure mold to replace...

Embodiment 2

[0034] Polyethylene pellets with a number-average molecular weight of 340,000 and a melting point of 125°C were kneaded and extruded into a sheet by an extruder or injected into a sheet-like sample by an injection molding machine. By controlling the extrusion or injection molding process parameters (processing temperature of extruder is about 152°C and screw speed is 30 rpm, or processing temperature of injection molding machine is about 145°C), the juxtaposition of strongly oriented polymer samples is obtained In the high-pressure mold, the molding machine is closed, the mold is sealed, and then a small amount of carbon dioxide is filled to purge the high-pressure mold to replace the air in the mold, and then the high-pressure carbon dioxide is filled. The temperature in the mold is set at 118°C, and the pressure is controlled at 25MPa. Swell and penetrate for 60 minutes. Then quickly release the pressure to normal pressure to obtain a polymer nanoporous foam material. After...

Embodiment 3

[0036]Polypropylene pellets with a number-average molecular weight of 240,000 and a melting point of 160°C were kneaded and extruded into a sheet by an extruder or injected into a sheet-like sample by an injection molding machine. By controlling the extrusion or injection molding process parameters (processing temperature of extruder at about 195°C and screw speed of 20 rpm, or processing temperature of injection molding machine at about 185°C), a strongly oriented polymer sample was obtained and juxtaposed In the high-pressure mold, the molding machine is closed, the mold is sealed, and then a small amount of carbon dioxide is filled to purge the high-pressure mold to replace the air in the mold, and then the high-pressure carbon dioxide is filled. The temperature in the mold is set at 150°C, and the pressure is controlled at 24MPa. Swell and penetrate for 50 minutes. Then quickly release the pressure to normal pressure to obtain a polymer nanoporous foam material. After bri...

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Abstract

The invention relates to a preparation method of a polymer foam material. The preparation method comprises the following steps: mixing and extruding polymer particles through an extruder or injection-molding through an injection molding machine, to obtain a polymer sample; and placing the obtained polymer sample into a supercritical fluid for swelling and penetration, and then performing fast pressure relief, to obtain the polymer foam material. According to the method, before the swelling and penetration of a supercritical fluid to a polymer, mixing and extrusion through the extruder or injection molding of the injection molding machine are / is performed, and the polymer sample with a shish-kebab structure is prepared through adjusting parameters during extrusion or injection molding. The method is simple in process, easy in industrialization, and applicable to the majority of crystallization type polymers, as well as good in foaming effect.

Description

technical field [0001] The invention relates to a method for preparing a polymer foaming material, in particular to a method for preparing a polymer foaming material by using a supercritical fluid. Background technique [0002] As a new type of composite material filled with gas, foamed plastic is not only light in weight, saves materials, and has high specific strength, but also has excellent heat insulation, sound insulation, and cushioning properties. Therefore, it is widely used in industry, agriculture, packaging, and transportation. , daily necessities and even IT and aerospace, controllable membrane separation and other high-tech fields have a wide range of applications. The application of polymer foaming and molding technology is mainly concentrated in polystyrene, hard (soft) polyurethane, hard (soft) polyvinyl chloride, polyolefin, sponge rubber and other polymers. Demand continues to grow rapidly. Today, foam plastics and their molding technology have become an ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/12B29C45/78B29C47/92C08L23/12C08L23/06C08L67/04C08L67/02B29C48/92
Inventor 陈忠仁包锦标刘智峰张秀屏
Owner NINGBO UNIV
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