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Polystyrene resin laminated foam

A technology of polyethylene-based resin and foam, applied in the direction of synthetic resin layered products, laminated, layered products, etc., can solve the problems of low density, poor rigidity of polyethylene-based resin foam, etc., and achieve mechanical properties excellent effect

Active Publication Date: 2007-06-27
JSP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low density of this type of polyethylene, there is a disadvantage that the rigidity of the obtained polyethylene-based resin foam is poor, and most of them can only be used for flexible packaging.

Method used

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  • Polystyrene resin laminated foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0080] Embodiment 1~5 and comparative example 1~3,5,6

[0081] As the extruder for forming the foam layer of the laminated foam, a tandem extruder including two extruders with a diameter of 90 mm and a diameter of 120 mm was used as an extruder for forming the inner layer resin layer, An extruder with a diameter of 50 mm was used, and an extruder with a diameter of 40 mm was used as an extruder for forming the outermost resin layer. circular die head.

[0082] First, with respect to 100 parts by weight of the resin described in Table 1 for forming the foam layer, 0.7 parts by weight of a mixture of monosodium citrate and sodium bicarbonate (manufactured by Dainichi Seika Co., Ltd. A SSC-PO208K"), supplied to the raw material inlet of an extruder with a diameter of 90mm, heated and kneaded to make a molten resin mixture prepared at about 200°C, and pressed into the molten resin mixture as a foaming agent Isobutane was adjusted to 1.2 parts by weight with respect to 100 parts ...

Embodiment 6、 comparative example 4

[0087] As an extruder for forming the outermost resin layer, use a diameter of 50 mm to produce a laminated foam with a three-layer structure of outermost layer / foam layer / outermost layer without an inner layer. In addition, A laminated plate-shaped foam was obtained in the same manner as in Example 1. The laminated foam obtained in Example 6 was also excellent in appearance such as smoothness.

Embodiment 7

[0089] A sheet-shaped laminated foam was obtained in the same manner as in Example 1, except that carbon dioxide was used as a foaming agent, and 0.6 parts by weight of carbon dioxide was injected with respect to 100 parts by weight of resin for forming the foam layer. The laminated foam obtained in Example 7 was also excellent in appearance such as smoothness.

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Abstract

The invention is a polyethylene series resin laminated foam which has mechanical character of sufficiently maintaining rigidity, impact absorption and etc, and has a good resistance against the crack and craze. Polyethylene series resin lay with two sides laminated of polyethylene series resin foam lay has a apparent density of 150g / L to 350g / L, a continuous bubble ratio of 40% or less. The polyethylene series resin laminated foam has a thickness of 2-8mm, a curling modulus of elasticity of 150-350MPa. The ratio (a / b) of tensile elongation (a(mm)) of the polyethylene series resin lay of the invention and 25% compression strength (b(MPa)) of the polyethylene series resin laminated foam is 2.4mm / MPa or more. 25% compression strength (b(MPa)) of the polyethylene series resin laminated foam is 0.5-1.5MPa. Therefore the invention is provided with a good resistance against the crack and craze, meanwhile maintaining mechanical character of rigidity, impact absorption and etc.

Description

technical field [0001] The present invention relates to a polyethylene-based resin laminated foam, and more specifically, to a polyethylene-based resin laminated foam having resistance to cracks or cracks. Background technique [0002] Polyethylene-based resin foams are widely used in various applications such as cushioning materials and packaging materials. [0003] As a base resin constituting such a polyethylene-based resin foam, high-pressure low-density polyethylene is preferably used because of its good foamability. However, such polyethylene has a disadvantage of low rigidity due to its low density, resulting in poor rigidity of polyethylene-based resin foams, and most of them can only be used for flexible packaging applications. [0004] In this regard, Patent Document 1 proposes a polyethylene-based resin extruded foam sheet, which is a polyethylene-based resin with an apparent density of 70 g / L to 350 g / L and an open cell rate of 40% or less. Extrude a foamed she...

Claims

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Application Information

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IPC IPC(8): C08J9/00B32B27/32B32B37/14B29C67/20B29C47/04
Inventor 森田和彦室井崇秋山照幸
Owner JSP CORP
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