DE19740472A1 - Expanded polypropylene beads with low thermal conductivity - Google Patents

Expanded polypropylene beads with low thermal conductivity

Info

Publication number
DE19740472A1
DE19740472A1 DE1997140472 DE19740472A DE19740472A1 DE 19740472 A1 DE19740472 A1 DE 19740472A1 DE 1997140472 DE1997140472 DE 1997140472 DE 19740472 A DE19740472 A DE 19740472A DE 19740472 A1 DE19740472 A1 DE 19740472A1
Authority
DE
Germany
Prior art keywords
epp
particles
propylene
graphite
blowing agent
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.)
Granted
Application number
DE1997140472
Other languages
German (de)
Other versions
DE19740472B4 (en
Inventor
Frank Dr Braun
Guiscard Dr Glueck
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.)
BASF SE
Original Assignee
BASF SE
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 BASF SE filed Critical BASF SE
Priority to DE1997140472 priority Critical patent/DE19740472B4/en
Publication of DE19740472A1 publication Critical patent/DE19740472A1/en
Application granted granted Critical
Publication of DE19740472B4 publication Critical patent/DE19740472B4/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/16—Making expandable particles
    • C08J9/18—Making expandable particles by impregnating polymer particles with the blowing agent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066—Use of inorganic compounding ingredients
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/04—Condition, form or state of moulded material or of the material to be shaped cellular or porous
    • B29K2105/048—Expandable particles, beads or granules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2707/00—Use of elements other than metals for preformed parts, e.g. for inserts
    • B29K2707/04—Carbon
    • 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
    • C08J2201/00—Foams characterised by the foaming process
    • C08J2201/02—Foams characterised by the foaming process characterised by mechanical pre- or post-treatments
    • C08J2201/03—Extrusion of the foamable blend
    • 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
    • C08J2323/10—Homopolymers or copolymers of propene

Abstract

Expanded polypropylene (EPP) beads with a density of 10-200 g/l and a particle diameter of 1-10 mm, contain 0.1-10 wt.% homogeneously dispersed graphite particles. Independent claims are also included for production processes for EPP beads by: (a) impregnating graphite-containing polypropylene (PP) granules with 2-40 wt.% volatile blowing agent in aqueous suspension under pressure at 100-160 deg C, and then releasing the pressure; and (b) extruding PP together with graphite and 2-30 wt.% volatile organic blowing agent at 120-240 deg C and granulating the extruded product.

Description

Die Erfindung betrifft expandierte Polypropylen-Partikel mit einer Dichte von 10 bis 200 g/l und einem Partikeldurchmesser von 1 bis 10 mm auf Basis eines Propylenpolymerisats mit einem Propylengehalt von mehr als 85 Gew.-%.The invention relates to expanded polypropylene particles a density of 10 to 200 g / l and a particle diameter of 1 to 10 mm based on a propylene polymer with a Propylene content of more than 85% by weight.

Expandierte Polypropylen(EPP) -Partikel werden in großtechnischem Maßstab zur Herstellung von Schaumstoff-Formteilen eingesetzt. Diese werden vorwiegend als elastische, stoßfeste Verpackungsma­ terialien eingesetzt, die darüberhinaus auch wärmedämmende Eigen­ schaften haben. Ihre Wärmeleitfähigkeit ist aber für manche An­ wendungszwecke noch zu hoch.Expanded polypropylene (EPP) particles are used on an industrial scale Scale used for the production of foam molded parts. These are mainly used as an elastic, shockproof packaging material materials used, which also have thermal insulation properties have. However, their thermal conductivity is for some people applications still too high.

Nach dem Stand der Technik können Polyolefin-Schaumpartikel mit niedriger Wärmeleitfähigkeit hergestellt werden, indem Infrarot­ strahlung reflektierende Metallpigmente wie Aluminiumpulver ein­ gesetzt werden (DE-OS 195 05 266). Nachteilig an dieser Methode sind der hohe Preis und die eingeschränkte Verfügbarkeit der be­ nötigten Pigmente.According to the prior art, polyolefin foam particles can also be used low thermal conductivity can be made by infrared radiation reflecting metal pigments such as aluminum powder be set (DE-OS 195 05 266). A disadvantage of this method are the high price and the limited availability of the be necessary pigments.

Der Erfindung lag die Aufgabe zugrunde, EPP-Partikel bereitzu­ stellen, die sich zu Schaumstoff-Formteilen mit verringerter Wär­ meleitfähigkeit verarbeiten lassen.The object of the invention was to prepare EPP particles make the foam moldings with reduced heat Have conductivity processed.

Diese Aufgabe wird gelöst durch EPP-Partikel, die 0,1 bis 10, vorzugsweise 2 bis 8 Gew.-% Graphitpartikel in homogener Ver­ teilung enthalten.This problem is solved by EPP particles that are 0.1 to 10, preferably 2 to 8% by weight of graphite particles in homogeneous ver division included.

Propylenpolymerisate im Sinne der vorliegenden Erfindung sind Homopolypropylen und Randomcopolymere des Propylens mit bis zu 15, vorzugsweise 0,5 bis 12 Gew.-% Ethylen und/oder einem C4-C10-α-Olefin, vorzugsweise ein Copolymer von Propylen mit 0,5 bis 6 Gew.-% Ethylen oder Buten-1 oder ein Terpolymer aus Propylen, 0,5 bis 6 Gew.-% Ethylen und 0,5 bis 6 Gew.-% Buten-1.For the purposes of the present invention, propylene polymers are homopolypropylene and random copolymers of propylene with up to 15, preferably 0.5 to 12,% by weight of ethylene and / or a C 4 -C 10 -α-olefin, preferably a copolymer of propylene with 0, 5 to 6% by weight of ethylene or butene-1 or a terpolymer of propylene, 0.5 to 6% by weight of ethylene and 0.5 to 6% by weight of butene-1.

Die Propylenpolymerisate werden nach üblichen Verfahren mit Zieg­ ler-Natta-Katalysatoren hergestellt und fallen dabei im allgemei­ nen als lineare Polymere an. Für das unten beschriebene Extru­ sionschaumverfahren sind auch verzweigte Propylenpolymerisate, z. B. nach EP-A 588 321 geeignet. Auch mit Metallocen-Katalysato­ ren hergestellte Propylenpolymerisate nach EP-A 611 795 können mit Vorteil eingesetzt werden. Diese Propylenpolymerisate werden nach üblichen Verfahren in der Schmelze, vorzugsweise auf einem Extruder mit dem Graphitpartikeln vermischt. Diese weisen vor­ zugsweise eine Teilchengröße von 0,1 bis 100 µm, insbesondere von 1 bis 20 µm auf.The propylene polymers are made using goat ler-Natta catalysts are manufactured and generally fall NEN as linear polymers. For the extru described below ionic foam processes are also branched propylene polymers, e.g. B. according to EP-A 588 321 suitable. Also with metallocene catalyst Ren produced propylene polymers according to EP-A 611 795 can can be used with advantage. These propylene polymers are by conventional melt processes, preferably on a Extruder mixed with the graphite particles. These show  preferably a particle size of 0.1 to 100 microns, in particular 1 to 20 µm.

Die Herstellung der erfindungsgemäßen EPP-Partikel erfolgt nach den an sich bekannten Imprägnier- bzw. Schaumextrusionsverfahren. Beim Imprägnierverfahren wird granuliertes, Graphitpartikel ent­ haltendes Polypropylen zusammen mit 1 bis 40, vorzugsweise 5 bis 30 Gew.-% eines flüchtigen Treibmittels in Wasser suspendiert. Als Treibmittel kommen Kohlenwasserstoffe, wie z. B. Butan, Pentan, Cyclopentan, Cyclohexan, Ethanol, ferner Gase wie Kohlen­ dioxid, Edelgas, Luft oder Stickstoff in Frage, sowie Gemische dieser Treibmittel. Die Imprägnierung wird vorzugsweise in einem Rührreaktor bei Temperaturen von 100 bis 160°C unter einem Druck von 10 bis 100 bar bei Verweilzeiten zwischen 30 und 180 min durchgeführt. Anschließend wird entspannt, wobei die Schaum­ partikel entstehen.The EPP particles according to the invention are produced after the impregnation or foam extrusion processes known per se. The impregnation process removes granulated graphite particles holding polypropylene together with 1 to 40, preferably 5 to 30% by weight of a volatile blowing agent suspended in water. As blowing agents come hydrocarbons such. B. butane, Pentane, cyclopentane, cyclohexane, ethanol, also gases such as coal dioxide, noble gas, air or nitrogen in question, as well as mixtures this blowing agent. The impregnation is preferably in one Stirred reactor at temperatures from 100 to 160 ° C under one pressure from 10 to 100 bar with residence times between 30 and 180 min carried out. It is then relaxed, the foam particles arise.

Beim Extrusionsverfahren wird in einem Extruder das Propylenpoly­ merisat, zusammen mit den Graphitpartikeln und 2 bis 30 Gew.-% Treibmittel bei 120 bis 240°C aufgeschmolzen, wobei dieses gelöst wird. Nach einer Verweilzeit von 0,5 bis 90 min wird das treib­ mittelhaltige Polymere unter Aufschäumen durch eine Düse ausge­ preßt und granuliert.In the extrusion process, the propylene poly is in an extruder merisat, together with the graphite particles and 2 to 30% by weight Melting agent melted at 120 to 240 ° C, this being dissolved becomes. After a dwell time of 0.5 to 90 minutes, this will go medium-containing polymers foamed out through a nozzle presses and granulates.

Außer den Graphitpartikeln können dem Propylenpolymerisat übliche Zusatzstoffe, wie Farbstoffe, Pigmente, Keimbildner, Stabilisato­ ren, Flammschutzmittel, Gleitmittel und Antistatika zugesetzt werden.In addition to the graphite particles, the propylene polymer can be customary Additives such as dyes, pigments, nucleating agents, stabilizers , flame retardants, lubricants and antistatic agents become.

Die erfindungsgemäßen EPP-Partikel weisen eine Dichte von 10 bis 200, vorzugsweise von 15 bis 120 g/l auf und einen Partikeldurch­ messer von 1 bis 10 mm. Sie sind überwiegend geschlossenzellig mit einer Zellzahl von vorzugsweise 5 bis 500 Zellen pro mm2.The EPP particles according to the invention have a density of 10 to 200, preferably 15 to 120 g / l and a particle diameter of 1 to 10 mm. They are predominantly closed cells with a cell number of preferably 5 to 500 cells per mm 2 .

Die EPP können nach üblichen Verfahren mit Wasserdampf oder Heiß­ luft zu Schaumstoff-Formteilen verschweißt werden, welche dort Anwendung finden, wo es neben den elastischen Eigenschaften auch auf eine gute Wärmedämmung ankommt. Als Beispiele seien die Kühl­ schrankisolierung und die Verpackung von Heizkreisverteilern an­ geführt, die zusammen mit dem Verpackungsmaterial montiert wer­ den.The EPP can be steamed or hot using conventional methods air are welded to molded foam parts, which are there Find application where it has elastic properties as well good insulation is important. Examples include cooling cabinet insulation and the packaging of heating circuit distributors led who assembled together with the packaging material the.

Claims (5)

1. Expandierte Polypropylen(EPP)-Partikel mit einer Dichte von 10 bis 200 g/l und einem Partikeldurchmesser von 1 bis 10 mm, dadurch gekennzeichnet, daß sie 0,1 bis 10 Gew.-% Graphitpar­ tikel in homogener Verteilung enthalten.1. Expanded polypropylene (EPP) particles with a density of 10 to 200 g / l and a particle diameter of 1 to 10 mm, characterized in that they contain 0.1 to 10 wt .-% graphite particles in homogeneous distribution. 2. EPP-Partikel nach Anspruch 1, dadurch gekennzeichnet, daß das Propylenpolymerisat ausgewählt ist aus Homopolypropylen und einem Randomcopolymer von Propylen mit bis zu 15 Gew.-% Ethylen und/oder einem C4-C10-α-Olefin.2. EPP particles according to claim 1, characterized in that the propylene polymer is selected from homopolypropylene and a random copolymer of propylene with up to 15 wt .-% ethylene and / or a C 4 -C 10 α-olefin. 3. EPP-Partikel nach Anspruch 1, dadurch gekennzeichnet, daß der Graphit eine Teilchengröße von 0,1 bis 100 µm aufweist.3. EPP particle according to claim 1, characterized in that the Graphite has a particle size of 0.1 to 100 microns. 4. Verfahren zur Herstellung der EPP-Partikel nach Anspruch 1 durch Imprägnieren von Graphitpartikel enthaltendem Propylen­ polymerisat-Granulat mit 2 bis 40 Gew.-% eines flüchtigen Treibmittels in wäßriger Suspension unter Druck bei Tempera­ turen von 100 bis 160°C und anschließendem Entspannen.4. The method for producing the EPP particles according to claim 1 by impregnating propylene containing graphite particles polymer granules with 2 to 40 wt .-% of a volatile Blowing agent in aqueous suspension under pressure at tempera tures from 100 to 160 ° C and then relaxing. 5. Verfahren zur Herstellung der EPP-Partikel nach Anspruch 1 durch Extrudieren des Propylenpolymerisats zusammen mit Gra­ phitpartikeln und 2 bis 30 Gew.-% eines flüchtigen organi­ schen Treibmittels bei Temperaturen von 120 bis 240°C und Granulieren des erhaltenen Schaumstrangs.5. A method for producing the EPP particles according to claim 1 by extruding the propylene polymer together with Gra phit particles and 2 to 30 wt .-% of a volatile organi blowing agent at temperatures of 120 to 240 ° C and Granulating the foam strand obtained.
DE1997140472 1997-09-15 1997-09-15 Process for producing expanded polypropylene particles Expired - Fee Related DE19740472B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1997140472 DE19740472B4 (en) 1997-09-15 1997-09-15 Process for producing expanded polypropylene particles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1997140472 DE19740472B4 (en) 1997-09-15 1997-09-15 Process for producing expanded polypropylene particles

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DE19740472A1 true DE19740472A1 (en) 1999-03-18
DE19740472B4 DE19740472B4 (en) 2006-06-29

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6677040B1 (en) 1998-12-22 2004-01-13 Basf Aktiengesellschaft Expanded polypropylene particles
EP1602684A1 (en) * 2004-06-02 2005-12-07 Basf Aktiengesellschaft Polyolefin foam particles containing metal particles
EP1702945A1 (en) * 2005-03-18 2006-09-20 Basf Aktiengesellschaft Polyolefin foam particles containing fillers
EP1736294A2 (en) * 2005-06-21 2006-12-27 BASF Aktiengesellschaft Core material for sandwich panels
DE102012008595A1 (en) * 2012-04-27 2013-10-31 Nordfolien Gmbh Particle mixture for manufacturing plastic products, has multiple granular bodies that are provided in mixture in any shape, where granular bodies are formed with certain percentage of crushed material pieces of metal composite film
DE102018207778A1 (en) * 2017-05-18 2018-11-22 Wonderland Switzerland Ag Manufacturing method for a vehicle child seat

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013018163B4 (en) 2013-12-05 2016-08-25 Mann+Hummel Gmbh Fluid guide element of an engine air intake

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4496627A (en) * 1981-11-25 1985-01-29 Fujimori Kogyo Co., Ltd. Electrical conductive foam beads and molded electrical conductive foamed articles obtained therefrom
US4704239A (en) * 1984-04-28 1987-11-03 Japan Styrene Paper Corp. Process for the production of expanded particles of a polymeric material

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6677040B1 (en) 1998-12-22 2004-01-13 Basf Aktiengesellschaft Expanded polypropylene particles
EP1602684A1 (en) * 2004-06-02 2005-12-07 Basf Aktiengesellschaft Polyolefin foam particles containing metal particles
EP1702945A1 (en) * 2005-03-18 2006-09-20 Basf Aktiengesellschaft Polyolefin foam particles containing fillers
EP1736294A2 (en) * 2005-06-21 2006-12-27 BASF Aktiengesellschaft Core material for sandwich panels
DE102012008595A1 (en) * 2012-04-27 2013-10-31 Nordfolien Gmbh Particle mixture for manufacturing plastic products, has multiple granular bodies that are provided in mixture in any shape, where granular bodies are formed with certain percentage of crushed material pieces of metal composite film
DE102018207778A1 (en) * 2017-05-18 2018-11-22 Wonderland Switzerland Ag Manufacturing method for a vehicle child seat
US11447050B2 (en) 2017-05-18 2022-09-20 Wonderland Switzerland Ag Manufacturing method for a car safety seat
US11447051B2 (en) 2017-05-18 2022-09-20 Wonderland Switzerland Ag Manufacturing method for a child carrying device
DE102018207778B4 (en) 2017-05-18 2024-01-11 Wonderland Switzerland Ag Manufacturing process for a child vehicle seat

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Publication number Publication date
DE19740472B4 (en) 2006-06-29

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Owner name: BASF SE, 67063 LUDWIGSHAFEN, DE

R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee