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

a thermoplastic resin and microcellular technology, applied in the field of microcellular foam of thermoplastic resin, can solve the problems of poor mechanical strength and toughness of foams, and all the products produced from the above-mentioned patents have mechanical properties that are poorer than those of non-foamed counterparts, and achieve the effect of low specific gravity and mechanical properties

Inactive Publication Date: 2007-05-31
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0013] The present invention was made to solve the above problems, and an object of the present invention is to provide a microcellular foam having a low specific gravity and mechanical properties that are comparable to those of a non-foamed counterpart with a thick skin layer and a controlled size and distribution of micropores in the core layer.
[0014] Another object of the present invention is to provide a method of preparing such a microcellular foam by rapidly changing the temperature when a pressure drop is finished and cooling begins to increase the thickness of the skin layer and to control the size and distribution of micropores in the core layer.

Problems solved by technology

However, the resultant foams tend to have poor mechanical strength and toughness because of their large pore size (about 100 μm or larger) and high porosity (about 50% or higher).
However, all the products produced from the above-mentioned patents have mechanical properties that are poorer than those of 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

Examples

Experimental program
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Effect test

example 1

[0061] An extrusion apparatus 30 was prepared by attaching an extrusion die 34 that is capable of temperature control, which comprises a pressure drop region 31, a temperature change region 32, and a cooling region 33, and an adapter 35, to a twin screw extruder 36 (Göttfert Extrusiometer 350), as in FIG. 3. The lengths of the pressure drop region 31, the temperature change region 32, and the cooling region 33 of the extrusion die were 125 mm, 27 mm, and 40 mm, respectively.

[0062] 98 parts by weight of a rigid polyvinyl chloride (PVC) compound (LG Chem) used for interior / exterior housing and construction materials was added to the extruder. After the PVC was completely plasticized, 2 parts by weight of nitrogen was added to the barrel 4 of the extruder using a high-pressure pump. The resultant single-phase mixture was foamed to obtain a microcellular foam sheet 2 mm thick and 100 mm wide.

[0063] The temperature of the barrel 1 was maintained at 190° C., that of barrels 2 to 4 at 18...

examples 2 and 3

[0065] A microcellular foam sheet was prepared in the same manner as in Example 1 except that the temperatures of the pressure drop region, the temperature change region, and the cooling region were changed as given in Table 1.

example 4

[0066] A microcellular foam sheet was prepared in the same manner as in Example 1 except that the temperatures of the pressure drop region, the temperature change region, and the cooling region were changed as given in Table 1, and a die that produces a 1 mm-thick sheet was used.

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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

CROSS REFERENCES TO RELATED APPLICATION [0001] This application claims priority to and the benefit of Korean Patent Application Nos. 10-2005-0115637, and 10-2005-0115638, both filed in the Korean Industrial Property Office on Nov. 30, 2005, and both of which are hereby incorporated by references for all purpose as if fully set forth herein. FIELD OF THE INVENTION [0002] 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 of a thermoplastic resin having a low specific gravity but mechanical properties comparable to those of conventional non-foamed sheets and a method for preparing the same. BACKGROUND OF THE INVENTION [0003] Foams used for thermal insulation, sound absorption, buoyancy, elasticity, weight reduction, soundproofing, etc. in soundproofing materials, heat insulating materials, construction materials, lightweight structural frames, packing materials, insulating m...

Claims

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Application Information

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IPC IPC(8): C08J9/00B29C48/525B29C48/82
CPCB29C44/3419B29C47/0004B29C47/0021B29C47/003B29C47/38B29C47/404B29C47/6012B29C47/842B29C47/86B29C47/864B29K2105/04C08J9/34C08J2201/03B29C48/875B29C48/865B29C48/022B29C48/06B29C48/08B29C48/12B29C48/395B29C48/404B29C48/82B29C48/845B29C48/86B29C48/87B29C48/40B29C48/525
Inventor NAM, KYUNG-GUCHOI, KI-DEOGPARK, JONG-SUNGSON, SEON-MOLEE, BONG-KEUNMIN, KYUNG-JIP
Owner LG CHEM LTD
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