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Microcellular foam of thermoplastic resin prepared with die having improved cooling property and method for preparing the same

A microcellular foam and foam technology, applied in the field of thermoplastic resin microcellular foam and its preparation, can solve the problems of poor mechanical properties and the like

Inactive Publication Date: 2009-05-27
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the mechanical properties of all products prepared by the aforementioned patents are inferior to those of their non-foamed counterparts

Method used

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  • Microcellular foam of thermoplastic resin prepared with die having improved cooling property and method for preparing the same
  • Microcellular foam of thermoplastic resin prepared with die having improved cooling property and method for preparing the same
  • Microcellular foam of thermoplastic resin prepared with die having improved cooling property and method for preparing the same

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preparation example Construction

[0049] In the preparation method according to the present invention, the temperature at the end of the pressure drop zone can be adjusted according to the specific thermoplastic resin used, but the temperature is preferably 150-250°C. If the temperature at the end of the pressure drop zone is lower than 150°C, sufficient micropores will not be formed. On the contrary, if the temperature at the end of the pressure drop region exceeds 250°C, deterioration of the thermoplastic resin or excessive foaming will occur.

[0050] In addition, the temperature at the beginning of the cooling zone can also be adjusted according to the specific thermoplastic resin used. Preferably, the temperature is slightly higher than the melting or softening point of the thermoplastic resin, and more preferably a temperature of 40 to 150°C. If the temperature at the beginning of the cooling zone is lower than 40°C, rapid solidification may hinder a smooth manufacturing process. On the contrary, if th...

Embodiment 1

[0069] Such as image 3 As shown, a temperature-controllable extrusion die 34 (which includes a pressure drop zone 31, a temperature change zone 32, and a cooling zone 33) and a connector (adapter) 35 is connected to a twin-screw extruder 36 (G ttfert Extrusiometer 350) to prepare extrusion device 30. The lengths of the pressure drop zone 31 , the temperature change zone 32 and the cooling zone 33 of the extrusion die are 125mm, 27mm and 40mm respectively.

[0070] 98 parts by weight of a rigid polyvinyl chloride (PVC) compound (LG Chem), which can be used as indoor / outdoor and building materials, was charged into the above-mentioned extruder. After the PVC is completely plasticized, 2 parts by weight of nitrogen is added to the barrel 4 of the extruder with a high-pressure pump. The resulting single-phase mixture was foamed to obtain a microcellular foam sheet 2 mm thick and 100 mm wide.

[0071] The temperature of barrel 1 was maintained at 190°C, the temperature of barr...

Embodiment 2 and 3

[0074] A microcellular foam sheet was prepared in the same manner as in Example 1, except that the temperatures in the pressure drop zone, temperature change zone, and cooling zone were changed to the temperatures given in Table 1.

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Abstract

The present invention relates to a microcellular foam of a thermoplastic resin and a method for preparing the same, and more particularly to a microcellular foam comprising a skin layer having a porosity of below 5% and a core layer having a porosity of at least 5%, wherein the thickness of the skin layer accounts for 5 to 50% of the entire foam, and a method for preparing the same. The microcellular foam of the present invention is advantageous in that it has a thicker skin layer and smaller and uniform micropores in the core layer, compared with conventional microcellular foams, while having mechanical properties comparable to those of conventional non-foamed sheets.

Description

[0001] References to related applications [0002] This application claims priority and benefit from Korean Patent Application Nos. 10-2005-0115637 and 10-2005-0115638, filed together with the Korean Industrial Property Office on November 30, 2005, for various purposes fully set forth herein, and therefore Both of the aforementioned patent applications are incorporated by reference. technical field [0003] The present invention relates to a thermoplastic resin microcellular foam and a preparation method thereof, more particularly, to a thermoplastic resin microcellular foam having a low specific gravity but having mechanical properties equivalent to those of conventional non-foamed sheets and a preparation method thereof . Background technique [0004] Foams made by using physical or chemical blowing agents can be used in sound insulation materials, heat insulation materials, construction materials, lightweight structural frames, filling materials, insulation materials, cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18B29C67/20
CPCB29C44/348C08J9/122C08J9/18C08J2300/22C08J2327/06C08L27/06
Inventor 南景九崔基德朴钟星孙先模李奉根闵庚楫
Owner LG CHEM LTD
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