DE2918608A1 - Polyolefin esp. crosslinked polyethylene tempering - by introducing and/or applying inert gas above crystallite melting point range - Google Patents

Polyolefin esp. crosslinked polyethylene tempering - by introducing and/or applying inert gas above crystallite melting point range

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Publication number
DE2918608A1
DE2918608A1 DE19792918608 DE2918608A DE2918608A1 DE 2918608 A1 DE2918608 A1 DE 2918608A1 DE 19792918608 DE19792918608 DE 19792918608 DE 2918608 A DE2918608 A DE 2918608A DE 2918608 A1 DE2918608 A1 DE 2918608A1
Authority
DE
Germany
Prior art keywords
inert gas
melting point
esp
introducing
polyolefin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19792918608
Other languages
German (de)
Inventor
Friedrich Imgram
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
WIRSBO PEX GmbH
Original Assignee
WIRSBO PEX GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by WIRSBO PEX GmbH filed Critical WIRSBO PEX GmbH
Priority to DE19792918608 priority Critical patent/DE2918608A1/en
Publication of DE2918608A1 publication Critical patent/DE2918608A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/0063—After-treatment of articles without altering their shape; Apparatus therefor for changing crystallisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00—After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/009—After-treatment of articles without altering their shape; Apparatus therefor using gases without chemical reaction
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
    • C08J7/04—Coating
    • C08J7/0427—Coating with only one layer of a composition containing a polymer binder
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment

Abstract

Parent patent, discloses a process for improving polyolefin, polyester or rubber, but esp. crosslinked polyethylene article quality, by introducing or applying an inert gas into material layer and/or on article surface. In this addn., the article is treated above its utilisation temp. at or above crystallite m.pt. range, e.g. 140-300 degrees C. Inert gas penetration is quicker and/or diffused inert gas atom quantity is increased.

Description

Verfahren zur Vergütung von Produkten aus Process for the remuneration of products

Polyolefinen (Zusatz zu Patentanmeldung P 28 21 806.6) Die Erfindung bezieht sich auf ein Verfahren zur Vergütung von Produkten aus Polyolefinen, insbesondere von vernetzten Polyäthylen. Polyolefins (addendum to patent application P 28 21 806.6) The invention relates to a method for the remuneration of products made of polyolefins, in particular of cross-linked polyethylene.

Die vorliegende Erfindung bezweckt, die Durchführung dieees Verfahrens weiter zu verbessern. Zu diesem Zweck sieht die Erfindung vor, daß das Verfahren bei einer Temperatur oberhalb der Benutzungstemperatur des Werkstoffes im Bereich des oder oberhalb des Kristallit-Schmelzpunktes (z.B. 140-: 3000C) ausgeführt wird.The present invention aims to implement this method to improve further. For this purpose, the invention provides that the method at a temperature above the use temperature of the material in the area of or above the crystallite melting point (e.g. 140-: 3000C).

Mit diesee Maßnahme wird erreicht, daß die Permeation des Edelgases schneller erfolgt und/oder die Menge der eindiffundierten Edelgasatome vergrößert wird.With this measure it is achieved that the permeation of the noble gas occurs faster and / or increases the amount of noble gas atoms diffused in will.

Bine Einbringungsmethode könnte wie bei der normalen Extrusion von Kunststoffrohren stattfinden. Hier würde ledig-; lich die Stützluft durch die bereits beschriebenen Edelgase oder Vermischungen derselben ersetzt werden.A method of introduction could be the same as normal extrusion of Plastic pipes take place. Here would be single; Lich the support air through the already described noble gases or mixtures thereof are replaced.

Die normalen Extrusionstemperaturen liegen bei 1400 - 3000cm Da die Stützluft aus Edelgasen bei diesen Temperaturen eine schnellere Stoffwechselgeschwindigkeit (Permeation/Diffusio4) hat und bedingt durch die wärmeausdehnung größere Hohlräume in der Rohrwand (Material) entstehen, ist eine Anwendung dieser Stützluftmethode oberhalb der Bsnutzungstemperaturen des Produktes sinnvoll. Die Mengen dieser Gase sind bedingt durch die Gasgesetze, druck- und temperaturabhängig. Durch geregelte Kühlung von augen wird die Kritallinität einsetzen und die aufstrebenden Gasatome werden in den molekularen- und Wärmeausdehnungs-Hohlräume eingeklemmt und gehalten.The normal extrusion temperatures are between 1400 and 3000 cm Support air from noble gases at these temperatures a faster metabolic rate (Permeation / Diffusio4) has larger cavities due to the thermal expansion This support air method is used in the pipe wall (material) makes sense above the usage temperature of the product. The amounts of these gases are due to the gas laws, pressure and temperature dependent. By regulated Cooling of the eyes will set in the criticalinity and the emerging gas atoms are clamped and held in the molecular and thermal expansion cavities.

Da die Einsatztemperaturen der Produkte meistens unter dem Kristallitschmelzpunkt liegen, und die molekularen Hohlräume durch Edelgase gefüllt sind, die durch das Zusammen-'rt ziehen bei der Kühlung und Kristallbildung gehalten werden, kann erwartet werden, daß eine bessere Gasdichte eintritt.Since the application temperatures of the products are mostly below the crystallite melting point and the molecular cavities are filled by noble gases emitted by the Pulling together while cooling and crystal formation can be expected that a better gas density occurs.

Ein weiteres Ausgestaltungsmerkmal der Erfindung wird darin gesehen, daß die Produkte anschließend geregelt gekühlt werden. Hiermit wird ein noch besserer Einbau des Edelgases in die Kristallitstruktur angestrebt und einem Abwandern der Edelgasmoleküle entgegengewirkt.Another feature of the invention is seen in that that the products are then cooled in a regulated manner. This makes an even better one Incorporation of the noble gas aimed at the crystallite structure and a migration of the Counteracted noble gas molecules.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, daß die so vergüteten Produkte anschließend geregelt abgekühlt werden, um den Einbau der Gasmoleküle sicherzustellen und gegebenenfalls mindestens die Außenhaut kristallin zu erhalt.In a further embodiment of the invention it is provided that the so tempered products are then cooled in a regulated manner in order to incorporate the gas molecules ensure and, if necessary, at least keep the outer skin crystalline.

Dabei wird die Permeation der Gasmoleküle gebremst bzw. ver-; langsamt und die Molekül struktur verschlossen.The permeation of the gas molecules is slowed down or decelerated; slow and the molecule structure closed.

Claims (4)

Ansprüche: 1. Verfahren zur Vergütung von Produkten aus Polyolefinen, Polyester, Gummi und ähnlichen Stoffen, insbesondere aus vernetzten Polyäthylen, bei dem in die Werætoffschichc und/oder auf die Oberfläche eines Produktes dieser Werkstoffe ein Edelgas ein- bzw. aufgebracht wird, dadurch gekennzeichnet, daß es bei einer Temperatur oberhalb der Benutzungstemperatur des Werkstoffes im Bereich des oder oberhalb des Kristallit-Schmelzpunktes (z.B. 140-300°C) ausgeführt wird. Claims: 1. Process for the remuneration of products made from polyolefins, Polyester, rubber and similar materials, especially those made from cross-linked polyethylene, in the Werætoffschichc and / or on the surface of a product of this Materials a noble gas is introduced or applied, characterized in that it at a temperature above the use temperature of the material in the area at or above the crystallite melting point (e.g. 140-300 ° C). 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Kristallbildung während einer Wärmebehandlung und nach dem Eindiffundieren der Gasmoleküle erfolgt.2. The method according to claim 1, characterized in that the crystal formation takes place during a heat treatment and after the gas molecules have diffused in. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Produkte anschließend geregelt abgekühlt werden.3. The method according to claim 1 or 2, characterized in that the Products are then cooled in a controlled manner. 4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das Edelgas bzw. eine Mischung mit einem Inertgas als Stützluft bei und/oder nach der Extru-l sion von Produkten auf deren innere und/oder äußere Ober-[ fläche aufgebracht wird.4. The method according to any one of the preceding claims, characterized in that that the noble gas or a mixture with an inert gas as supporting air with and / or after the extrusion of products on their inner and / or outer upper [ surface is applied.
DE19792918608 1979-05-09 1979-05-09 Polyolefin esp. crosslinked polyethylene tempering - by introducing and/or applying inert gas above crystallite melting point range Withdrawn DE2918608A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19792918608 DE2918608A1 (en) 1979-05-09 1979-05-09 Polyolefin esp. crosslinked polyethylene tempering - by introducing and/or applying inert gas above crystallite melting point range

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19792918608 DE2918608A1 (en) 1979-05-09 1979-05-09 Polyolefin esp. crosslinked polyethylene tempering - by introducing and/or applying inert gas above crystallite melting point range

Publications (1)

Publication Number Publication Date
DE2918608A1 true DE2918608A1 (en) 1980-11-20

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DE19792918608 Withdrawn DE2918608A1 (en) 1979-05-09 1979-05-09 Polyolefin esp. crosslinked polyethylene tempering - by introducing and/or applying inert gas above crystallite melting point range

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DE (1) DE2918608A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3517274A1 (en) * 1985-05-14 1986-11-20 Bayer Ag, 5090 Leverkusen METHOD FOR SURFACE EQUIPMENT
DE19734980A1 (en) * 1997-08-13 1999-02-18 Schaeffler Waelzlager Ohg Gearbox for motor vehicles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3517274A1 (en) * 1985-05-14 1986-11-20 Bayer Ag, 5090 Leverkusen METHOD FOR SURFACE EQUIPMENT
DE19734980A1 (en) * 1997-08-13 1999-02-18 Schaeffler Waelzlager Ohg Gearbox for motor vehicles

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