Purging agent and purging method using same

A cleaning agent and metal technology, applied in the field of cleaning agents, can solve problems such as cleaning performance decline, thermal deterioration, and product streaks, and achieve high-efficiency results

Active Publication Date: 2013-03-13
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the case of melt-molding a thermoplastic resin for a long time, there is a problem that a part of the thermoplastic resin remains in the resin flow path of a melt-molding machine such as an extruder for a long time, and gelling, thermal deterioration, decomposition, etc. occur, thereby Streaks appear in the product, or the gel is mixed in the product, which causes a defective product
[0007] However, Patent Document 1 describes that in this process, "it is important that the content of the metal salt is 0.05 to 1% by weight based on the polyolefin polymer, and when the content does not fall within this range, the object of the invention cannot be achieved" (paragraph [0011])
This is presumed to be because when a large amount of organic salt is contained exceeding 1% by weight, a large amount of compounded organic salt is immediately melted in the resin flow path, the viscosity is excessively reduced, and the cleaning performance is reduced

Method used

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  • Purging agent and purging method using same
  • Purging agent and purging method using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0106] 90 parts of linear low-density polyethylene (NOVATEC LL UF230, manufactured by Japan Polyethylene Corporation, MFR: 1.0 g / 10 min (190°C, 2,160 g load), density: 0.921 g / cm 3 , number average molecular weight (polystyrene benchmark): 3.2×10 4 , dispersion degree (Mw / Mn): 3.9) was used as a cleaning agent, and 5 parts of magnesium stearate (manufactured by NOF Corporation, melting point: 125° C.) and 5 parts of basic magnesium carbonate (manufactured by Konoshima Chemical Co., Ltd., GOLD STAR) were used as metal salts and these were dry blended. The content of the metal salt in the obtained cleaning agent was 10% by weight, and the content of the metal salt was 1.5% by weight based on the metal based on the hydrocarbon resin.

[0107] The dry-blended product was melt-kneaded and shaped into pellets using a twin-screw extruder under the following conditions.

[0108] Screw diameter: 30mm

[0109] Extruder temperature: Cl / C2 / C3 / C4 / C5 / C6 / C7 / H / D=80 / 100 / 210 / 220 / 220 / 220 / 230 / ...

Embodiment 2

[0131] Except for the use of NIPOLON L F21, manufactured by Tosoh Corporation (MFR: 1.1g / 10min (190°C, load 2,160g), density: 0.92g / cm 3 , number average molecular weight (polystyrene benchmark); 2.0×10 4 , Dispersion (Mw / Mn): 5.7) Except for linear low-density polyethylene, an experiment was performed in the same manner as in Example 1, and the same evaluation as in Example 1 was performed.

Embodiment 3

[0140]The cleaning agent obtained in Example 1 was used, and the following evaluations were performed.

[0141]

[0142] The following resin composition was prepared as a model composition of a recycled resin composition of a multilayer structure.

[0143] Using a single-screw extruder under the same conditions as in Example 1, the following resin composition was discharged for 30 minutes while being fed, and allowed to stand for 2 hours while being heated, and reproduced after long-term production of the resin composition status.

[0144]

[0145] Polypropylene (NOVATEC PP FX4G, manufactured by Nippon Polypropylene Corporation) 85 parts

[0146] Binder resin (MODIC-AP P604V, manufactured by Mitsubishi Chemical Corporation) 5 parts

[0147] Saponified ethylene-vinyl acetate copolymer 10 parts

[0148] (Ethylene content: 29 mol%, saponification degree: 99.8 mol%, MFR: 3.4g / 10min (210°C, 2160g load)

[0149]

[0150] Thereafter, the mold cleaning agent was supplied ove...

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Abstract

Disclosed is a purging agent which is capable of achieving excellent cleaning effect even in a severe environment such as in a die portion of a melt molding machine, where the channel is narrow and the temperature is high. Specifically disclosed is a purging agent which contains a hydrocarbon resin and at least one kind of a salt of a group 1 or group 2 metal of the short form periodic table. The content of the metal salt relative to the hydrocarbon resin is more than 1% by weight in terms of the metal.

Description

technical field [0001] The present invention relates to a cleaning agent used in equipment for melt-molding thermoplastic resins, and particularly to a cleaning agent suitable for saponifying ethylene-vinyl ester copolymer resins, and a cleaning method using the same. Background technique [0002] Conventionally, thermoplastic resins having high polarity such as saponified ethylene-vinyl ester copolymer resins (hereinafter referred to as "EVOH resins"), polyvinyl alcohol-based resins (hereinafter referred to as "PVA resins"), and polyamide-based resins (hereinafter referred to as "PA resin") has excellent gas barrier properties, and thus is generally used by molding the resin into a packaging film or container for food by a melt molding method. [0003] However, in the case of melt-molding a thermoplastic resin for a long time, there is a problem that a part of the thermoplastic resin remains in the resin flow path of a melt-molding machine such as an extruder for a long tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C47/08C08K3/24C08K5/098C08L101/00B29C48/03
CPCB29C47/0881C08K9/08B29C47/0011C08L101/00C08K5/098C11D7/12C08K3/24B29C47/08C11D7/265B29C48/03B29C48/2715C08L23/0815
Inventor 加藤健司大西英史
Owner MITSUBISHI CHEM CORP
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