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Process for producing crosslinked foam of polyolefin-based resin

A technology of polyolefin resin and cross-linked foam, which is applied in the field of manufacturing polyolefin resin cross-linked foam, and can solve problems such as unsatisfactory economics

Inactive Publication Date: 2007-05-23
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the conventional method of producing a crosslinked foam by the pressure foaming method, the dimensions (thickness, length, Width, etc.) are different, so, for example, when obtaining a cross-linked foam larger than the desired size, useless parts are cut off, or for each cross-linked expandable polyolefin resin composition used as a raw material The mold is prepared separately, and the mold is changed according to the resin composition used for molding, so the economic efficiency is not satisfactory.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0028] Hereinafter, the present invention will be described in more detail through examples.

[0029] [I] Physical property measurement method

[0030] (1) Melt flow rate (MFR, unit: g / 10 minutes)

[0031] According to JIS K7210-1995, it measures by A method on the conditions of temperature 190 degreeC and load 21.18N.

[0032] (2) Density (unit: kg / m 3 )

[0033] After performing the annealing described in JIS K6760-1995, it measures by the water substitution method described in JIS K7112-1980.

[0034] (3) Amount of vinyl acetate units (unit: weight %)

[0035] Measured in accordance with JIS K6730-1995.

[0036] (4) The thickness of the foam (unit: mm)

[0037] The thickness of the cross-linked foam was measured after the pressure-foamed cross-linked foam was adjusted at room temperature for 24 hours. In addition, the thickness is the thickness measured at 5 points of the center part of a crosslinked foam, and the average value was calculated|required.

[0038] (5) ...

reference example 1

[0043] 100 parts by weight of ethylene-vinyl acetate copolymer (Cosmosen H2181 [MFR=2g / 10 points, density = 940kg / m 3 , vinyl acetate unit amount=18% by weight]; hereinafter referred to as EVA), 10 parts by weight of heavy calcium carbonate, 1 part by weight of stearic acid, 1.5 parts by weight of zinc oxide, 2.5 parts by weight of azo as a chemical blowing agent Diformamide (Sankyo Kasei Co., Ltd. Celmic(R) CE) and 1 part by weight of cumene peroxide were kneaded to obtain a resin composition. Fill 260g of this resin composition in a mold with a size of 15cm×15cm×10mm in the mold, at a temperature of 160°C, for 10 minutes, and a pressure of 130kg / cm 2 Under certain conditions, the cross-linked foam is obtained by pressurized foaming. Table 1 shows the evaluation results of physical properties of the obtained crosslinked foam.

Embodiment 1

[0045] 80 parts by weight of ethylene-α-olefin copolymer (Excelen GMHCB0002 [MFR=0.5 g / 10 manufactured by Sumitomo Chemical Co., Ltd.] Points, density = 912kg / m 3 ]; Hereinafter, referred to as PE), 20 parts by weight EVA, 10 parts by weight of heavy calcium carbonate, 1 part by weight of stearic acid, 1.5 parts by weight of zinc oxide, 5.7 parts by weight of azodicarbonamide ( A resin composition was obtained by kneading Celmic(R) CE manufactured by Sankyo Kasei Co., Ltd. and 1 part by weight of cumene peroxide. The size in the mold is 15cm * 15cm * 10mm in the mold that installs the aluminum plate of 15cm * 15cm * 2mm, fills this resin composition of 210g in the mold, is that temperature is 160 ℃, time is 8 minutes, and pressure is 130kg / cm 2 Under certain conditions, the cross-linked foam is obtained by pressurized foaming. Table 1 shows the evaluation results of physical properties of the obtained crosslinked foam.

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PUM

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Abstract

A process for producing a crosslinked foam of a polyolefin-based resin by a pressure-foaming method, which comprises heating a polyolefin-based resin composition containing the polyolefin-based resin, a crosslinking agent and foaming agent under pressure using a mold in which a metal charge is charged inside the mold.

Description

technical field [0001] The invention relates to a method for producing a polyolefin resin cross-linked foam. Background technique [0002] Cross-linked foams made of olefin resins such as high-pressure low-density polyethylene and ethylene-vinyl acetate copolymer are used in various products as heat insulating materials and cushioning materials. As a method for producing a cross-linked foam, a pressure foaming method is generally used. For example, it is known to combine a cross-linked foamable polyolefin resin formed by a high-pressure method low-density polyethylene, a foaming agent, and a cross-linking agent. The material is filled in the mold, heated under pressure for a certain period of time to decompose the foaming agent and crosslinking agent, and then remove the pressure to make the foam expand from the mold to obtain the foam (for example, JP Zhao 61-266441 Bulletin), etc. [0003] In the manufacture of a cross-linked foam, use a cross-linked foamable polymer tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/00C08L23/00C08K3/08B29C67/20
CPCB29C35/02C08J9/103B29C44/3415C08J2323/26B29C44/12B29C44/16
Inventor 山田胜大铃木靖朗
Owner SUMITOMO CHEM CO LTD