Thermoplastic resin physical foaming material preparation device and preparation method thereof

A technology for thermoplastic resin and preparation equipment, which is applied in the field of thermoplastic resin foaming materials, can solve the problems of limited application range and increased energy waste, and achieve the effects of simple process flow, no waste of raw materials, and easy operation and control

Active Publication Date: 2009-12-30
浙江博发新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of dispersion medium increases the waste of energy
The chemical molding method and the improved method of molding and foaming engineering plastics are affected by chemical foaming agents, and the scope of application is limited. It is also necessary to solve the problems of material recycling, resource conservation and environmental protection.

Method used

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  • Thermoplastic resin physical foaming material preparation device and preparation method thereof
  • Thermoplastic resin physical foaming material preparation device and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 As shown, the preparation device of thermoplastic resin physical gas foaming material is composed of a hot press 1 , a high-pressure container 2 and a gas pressurization system 10 . The high-pressure container 2 is placed between the upper and lower platens of the heat press. One end of the high-pressure container 2 is provided with a gas inlet 4, and the gas inlet is connected with the gas pressurization system 10 and the gas storage tank 11 through the gas control valve 8, and the other end of the high-pressure container is provided with a gas outlet 3, and the gas outlet It is connected with the pressure relief control valve 9, and the high-pressure container is also provided with a temperature and pressure sensor 5, which is connected with the data receiving and processing system 6. The high-pressure container is a combination of upper and lower templates, and a sealing ring 7 is arranged between the templates.

[0040]The preparation method of th...

Embodiment 2

[0041] Embodiment 2, the preparation of high-density polyethylene and polypropylene blend foam material

[0042] According to the preparation device of Example 1, the high-density polyethylene and polypropylene blend foam material was prepared. The blends of high-density polyethylene and polypropylene (20 / 80) were prepared by MiniLab micro-blending rheometer of HAAKE company. The preparation conditions are: melting temperature 190° C., conical twin-screw mixing at 50 rpm for 5 minutes. The mixed extrudate was sheared into particles 4 mm long, 4 mm wide, and 1 mm thick.

[0043] The blend particles are placed in the mold, ensuring that the total volume of the particles does not exceed 1 / 25 of the volume of the mold, so that the particles have enough space for foaming. Then the mold is put between the pressing plates of the hot press, and the hot press closes the mold, and the pressure acting on the mold is 30MPa. Heat the mold to 167°C with a hot press, inject nitrogen into ...

Embodiment 3

[0044] Embodiment 3, the preparation of low-density polyethylene foam material

[0045] According to the preparation device of Example 1, the low-density polyethylene foam material was prepared. The low-density polyethylene particles are placed in the mold, ensuring that the total volume of the particles does not exceed 1 / 25 of the mold volume, so that the particles have enough space for foaming. Then the mold is put between the pressing plates of the hot press, and the hot press closes the mold, and the pressure acting on the mold is 20MPa. Raise the temperature of the mold to 110°C through a hot press, inject nitrogen into the mold from a booster pump at a pressure of 5 MPa, keep the temperature and pressure constant for 60 minutes, and then release the pressure in the mold at a speed of 5 MPa / s to Atmospheric pressure. Unload the pressure of the hot press, take out the mold and open it, take out the expanded low-density polyethylene particles, and cool them at room temper...

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Abstract

The invention discloses a thermoplastic resin physical foaming material preparation device and preparation method thereof and is characterized in that the device comprises a hot pressing (1), a high pressure container (2) and a gas pressurization system (10); wherein, the high pressure container is arranged between an upper press plate and a lower press plate of the hot pressing, one end of the high pressure container is provided with a gas inlet (4) and connected with the gas pressurization system and a gas tank (11) through a gas control valve (8), the other end of the high pressure container is provided with a gas outlet (3) and connected with a depressurization control valve (9), the high pressure container is a mould which is combined by an upper mould plate and a lower plate mould and a sealing ring is arranged between the two mould plates. The preparation method comprises the following steps: placing the thermoplastic resin in a high pressure container of which the volume is 25 times or more than 25 times of the total volume of the particles, injecting 5-30MPa of gas at 110-170 DEG C, keeping the temperature and the pressure for 2-60min and then relieving the pressure in a speed of 5-20MPa/s to the normal pressure to obtain the thermoplastic resin foaming material.

Description

Technical field: [0001] The invention relates to a preparation device and a preparation method of thermoplastic resin physical foaming materials, belonging to the field of thermoplastic resin foaming materials. Background technique: [0002] At present, the preparation methods of thermoplastic resin foam materials in industry are mainly divided into physical gas foaming and chemical foaming. The former is a method of foaming directly using the gas injected into the thermoplastic resin, while the latter is a method of foaming using the gas generated by thermal decomposition of the compound mixed in the thermoplastic resin. [0003] There are two main ways to realize physical gas foaming, one is extrusion and injection foaming method; the other is kettle pressure foaming method. [0004] Extrusion and injection foaming methods are to first melt and plasticize the high polymer in a high temperature and high pressure extruder, and then inject foaming agents such as nitrogen, ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C44/02B29C44/60C08J9/12
Inventor 李文光吴炳田王亚虞晨阳
Owner 浙江博发新材料股份有限公司
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