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WO2007068647A1 - Procédé de traitement d'une poudre ou d'un granulat d'un thermoplastique ou d'un caoutchouc dans une machine à vis - Google Patents

Procédé de traitement d'une poudre ou d'un granulat d'un thermoplastique ou d'un caoutchouc dans une machine à vis Download PDF

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Publication number
WO2007068647A1
WO2007068647A1 PCT/EP2006/069425 EP2006069425W WO2007068647A1 WO 2007068647 A1 WO2007068647 A1 WO 2007068647A1 EP 2006069425 W EP2006069425 W EP 2006069425W WO 2007068647 A1 WO2007068647 A1 WO 2007068647A1
Authority
WO
WIPO (PCT)
Prior art keywords
rubber
powder
thermoplastic material
screw machine
rubbers
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.)
Ceased
Application number
PCT/EP2006/069425
Other languages
German (de)
English (en)
Inventor
Wolfgang Sauerer
Rainer Anderlik
Florian Hennenberger
Jens Assmann
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
Publication of WO2007068647A1 publication Critical patent/WO2007068647A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/02—Conditioning or physical treatment of the material to be shaped by heating
    • B29B13/021—Heat treatment of powders
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0855—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using microwave
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/285—Feeding the extrusion material to the extruder
    • B29C48/288—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules
    • B29C48/2886—Feeding the extrusion material to the extruder in solid form, e.g. powder or granules of fillers or of fibrous materials, e.g. short-fibre reinforcements
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers

Definitions

  • the invention relates to a method for treating powder or granules of a thermoplastic or a rubber, which can be heated by a high-frequency electric field, in a screw machine, wherein the powder or granules of the thermoplastic material or the rubber before being fed to the screw machine on a Temperature below the crystallite melting temperature in semi-crystalline thermoplastics or rubbers and preheated below the Schmelzberei- ches in amorphous thermoplastics or rubbers, the screw machine is melted and homogenized and then pressed through an extrusion die, granulated or processed into moldings.
  • screw machines apparatuses are referred to in a known manner, having one or more screws for melting, conveying and pressure build-up in a polymer.
  • Continuously operating screw machines are generally referred to as extruders.
  • Further screw machines are, for example, injection molding machines which operate semicontinuously.
  • thermoplastics or rubbers The granulation of thermoplastics or rubbers is known and serves to homogenize the thermoplastics or rubbers and possibly to incorporate additives and additives such as stabilizers, colorants, agents for improving the mechanical properties, fillers and the like in the thermoplastics or rubbers.
  • additives and additives such as stabilizers, colorants, agents for improving the mechanical properties, fillers and the like in the thermoplastics or rubbers.
  • the handling of the thermoplastics or rubbers during transport and further processing by granulation can be considerably improved compared to the handling of powder.
  • the addition of powder is especially in compounding the thermoplastic or rubber to the screw machine at a temperature which corresponds to the ambient temperature, is common. This is due, in particular, to the intermediate storage of the powder in silo plants and to the transport methods via pneumatic conveying systems, with generally complete cooling of the powder to ambient temperature occurring.
  • powders of the thermoplastic or rubber of the screw machine are generally supplied as bulk material at ambient temperature.
  • the powder must be melted after the feed zone of the screw machine: this takes place for the most part on the drive energy the screw machine, which is dissipatively converted into heat energy.
  • the melting takes place predominantly by the conversion of mechanical energy into heat and is supported, especially in large screw machines only to a lesser extent, by an external heating. Nevertheless, an external heater for starting the screw machine is necessary.
  • the melting of the powder on the drive energy of the screw machine means a high energy expenditure and, moreover, the material is subjected to a high shear and tensile stress during the melting process, which can lead to degradation and / or crosslinking reactions depending on the chemical nature of the thermoplastic or rubber ,
  • the invention consists in a process for treating powder or granules of a thermoplastic or a rubber which is partially crystalline or amorphous and which can be heated by a high-frequency electric field, in a screw machine, wherein the powder or granules of the thermoplastic material or the rubber prior to feeding to the screw machine to a temperature below the crystallite melting point of semicrystalline plastics or rubbers and below the melting range of thermoplastics or rubbers, melted in the screw machine and homogenized and then pressed through an extrusion die, granulated or processed to form parts, which is characterized It is characterized in that the preheating of the thermoplastic or rubber is effected by means of an electromagnetic high-frequency field.
  • thermoplastics or rubber very evenly by means of a high frequency electromagnetic field.
  • thermoplastic material or rubber can be heated by an electromagnetic high-frequency field.
  • electromagnetic high-frequency field include, in particular, those which have polar structures, that is to say a dipole moment greater than 0. It may, for example, be individual structural chemical units of the thermoplastic or rubber, for example CH 2 O units in polyoxymethylenes.
  • the polar structures make it possible to polarize the polarization of the powder or granules by means of an electromagnetic high-frequency field, in particular by microwave radiation.
  • Other possible heating mechanisms for the powder or granules are electrical resistance heating, heating by Maxwell-Wagner effect or electron polarization.
  • Thermoplastics with polar structures which are directly heatable in a radio frequency electromagnetic field include e.g. Polyamide (PA), polyetheretherketone (PEEK), polyethylene terephthalate (PET), polyvinylchloride (PVC), polyurethane (PU), polyoxymethylene (POM), polybutyleneterephthalate (PBT), polyethersulphone (PES), poly-n-butylmethacrylate (PBMA) , Polymethyl methacrylate (PMMA), polyimides or styrene acrylonitrile (SAN).
  • PA Polyamide
  • PEEK polyetheretherketone
  • PET polyethylene terephthalate
  • PVC polyvinylchloride
  • PU polyurethane
  • POM polyoxymethylene
  • PBT polybutyleneterephthalate
  • PES polyethersulphone
  • PBMA Poly-n-butylmethacrylate
  • PMMA Polymethyl methacrylate
  • SAN styren
  • Rubbers with polar structures are in particular chloroprene rubber, ethylene-acrylate rubber, ethylene-vinyl acetate rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber, acrylate rubber, fluorine rubber, oxygen rubber or silicone rubber.
  • a high-frequency electromagnetic field is any electromagnetic field suitable for the dielectric heating of a powder or granulate.
  • the electromagnetic high-frequency field used in the method according to the invention preferably has a frequency in the range of 100 kHz to 900 GHz.
  • the high frequency field has a frequency in the range of 0.3 to 300 GHz.
  • microwave radiation which is preferably used for preheating.
  • microwave radiation has been used in the art for microwave welding of polymers, thermoforming of polymer parts or hot drawing of polymer strands, rods or fibers. Such applications are described, for example, in H.
  • DE 10 2005 032 700.1 describes the use of an electromagnetic high-frequency field for reducing stresses in the powder or granules from a polymer melt.
  • the powder or granules are preheated in the post-treatment continuously by the application of microwave radiation.
  • Suitable microwave heaters are known in the art.
  • a microwave heating device with variable frequency can be used for the method according to the invention, as described in the document EP 0 801 879 B1.
  • the design and operation of the microwave sources are preferably adjusted in the inventive method on the material properties and on the shape of the thermoplastic material or rubber.
  • the power input can be distributed over several microwave devices, possibly also by cyclically switching them on and off.
  • the microwave source used is a round waveguide which concentrically surrounds the powder or granules.
  • a particularly favorable distribution of the microwave field is given, which leads to a particularly uniform heating.
  • a heat output is introduced into the powder or granules by the high-frequency field, which is controlled by means of a non-contact sensor that detects changes in properties of the powder or granules during preheating.
  • Such property changes that can be detected by the sensor are, for example, changes in temperature or refractive indices of the powder or granules.
  • the irradiation density of the electromagnetic high-frequency field can be constant during the preheating of the powder or granules or can be controlled in a time-dependent manner (for example stepwise, sinusoidally or linearly increasing or decreasing).
  • the symmetry of the high-frequency field can be adapted to the geometry of the powder or granules.
  • the powder or granulate preferably passes the electromagnetic high-frequency field continuously in the method according to the invention.
  • Prefers the high frequency field is designed so that the most homogeneous possible heating of the powder or granules occurs in the high frequency field.
  • the preheating of the powder or granules of the thermoplastic or rubber is advantageously carried out at a temperature in the range of 5 to 30 K below the crystallite melting point for semicrystalline plastics or rubbers and below the melting range for amorphous thermoplastics or rubbers.
  • the upper limit of the preheating temperature is in the range of 10 to 20 K below the crystallite melting temperature for semicrystalline plastics or rubbers and below the melting range for amorphous thermoplastics or rubbers.
  • the screw machine In processes for treating powder or granules of a thermoplastic or rubber, the screw machine is frequently additionally supplied with fillers or reinforcing materials.
  • the same before being supplied to the melting machine in an electromagnetic high-frequency field, in particular by means of microwave radiation, are preheated.
  • the preheated fillers or reinforcing materials do not damage the thermoplastic or rubber in the melting machine or are themselves damaged.
  • the material supplied to the screw machine in the form of powder or granules of a thermoplastic material or a rubber is melted and homogenized in the screw machine and then pressed through an extrusion die and granulated or pressed through an extrusion die and processed into a molded part.
  • a semi-finished product for example a pipe, hose or plastic profile or a finished part is referred to in a known manner.
  • the screw machine is preferably an extruder.
  • thermoplastic used in the process according to the invention is preferably polyoxymethylene, a polyamide or a polyester.
  • the inventive method has a number of advantages.
  • the preheating in the electromagnetic high-frequency field requires a small amount of time and energy consumption, since the heat energy is generated immediately inside the powder or granules by means of the electromagnetic high-frequency field.
  • the energy input can be selectively controlled, for example by varying the number and power of microwave sources.
  • the sources can be positioned so that the energy is entered as evenly as possible in the powder or granules.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Processes Of Treating Macromolecular Substances (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention concerne un procédé de traitement d'une poudre ou d'un granulat d'un thermoplastique ou d'un caoutchouc, semicristallin ou amorphe et pouvant être chauffé par l'intermédiaire d'un champ électrique haute fréquence, dans une machine à vis, la poudre ou le granulat du thermoplastique ou du caoutchouc étant préchauffé(e) avant d'être acheminé(e) vers la machine à vis à une température inférieure à la température de fusion des cristallites pour des caoutchoucs ou des plastiques semicristallins et inférieure à l'intervalle de fusion pour des caoutchoucs ou des thermoplastiques, fondu(e) dans la machine à vis et homogénéisé(e) puis pressé(e) à travers une filière d'extrusion et granulé(e) ou transformé(e) en pièces moulées. Ledit procédé se caractérise en ce que le préchauffage du thermoplastique ou du caoutchouc est effectué au moyen d'un champ électromagnétique haute fréquence.
PCT/EP2006/069425 2005-12-15 2006-12-07 Procédé de traitement d'une poudre ou d'un granulat d'un thermoplastique ou d'un caoutchouc dans une machine à vis Ceased WO2007068647A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005059965.6 2005-12-15
DE102005059965A DE102005059965A1 (de) 2005-12-15 2005-12-15 Verfahren zum Behandeln von Pulver oder Granulat eines thermoplastischen Kunststoffs oder eines Kautschuks in einer Schneckenmaschine

Publications (1)

Publication Number Publication Date
WO2007068647A1 true WO2007068647A1 (fr) 2007-06-21

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2006/069425 Ceased WO2007068647A1 (fr) 2005-12-15 2006-12-07 Procédé de traitement d'une poudre ou d'un granulat d'un thermoplastique ou d'un caoutchouc dans une machine à vis

Country Status (2)

Country Link
DE (1) DE102005059965A1 (fr)
WO (1) WO2007068647A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9374853B2 (en) 2013-02-08 2016-06-21 Letourneau University Method for joining two dissimilar materials and a microwave system for accomplishing the same

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4996779A (en) * 1988-03-24 1991-03-05 Nissui Kako Co., Ltd. Plastic material dryer
EP0814311A1 (fr) * 1996-06-20 1997-12-29 Colortronic GmbH Procédé et dispositif pour sécher
DE19818605C1 (de) * 1998-04-20 1999-12-23 Mannesmann Ag Verfahren und Vorrichtung zum Erwärmen von Kunststoffmassen
DE19858212A1 (de) * 1998-12-17 2000-06-21 Johann Kaa Verfahren zum Trocknen von Kunststoffgranulaten mittels Mikrowelle
WO2004071744A1 (fr) * 2003-02-04 2004-08-26 Agro Fibres Technologies-Plasturgie Sas Procede et appareillage pour incorporer une forte proportion de fibres naturelles coupees dans une matiere plastique, produits obtenus et applications
WO2004113812A1 (fr) * 2003-06-20 2004-12-29 Amut S.P.A. Dispositif et methode pour chauffer, secher et/ou cristalliser des matieres plastiques

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4996779A (en) * 1988-03-24 1991-03-05 Nissui Kako Co., Ltd. Plastic material dryer
EP0814311A1 (fr) * 1996-06-20 1997-12-29 Colortronic GmbH Procédé et dispositif pour sécher
DE19818605C1 (de) * 1998-04-20 1999-12-23 Mannesmann Ag Verfahren und Vorrichtung zum Erwärmen von Kunststoffmassen
DE19858212A1 (de) * 1998-12-17 2000-06-21 Johann Kaa Verfahren zum Trocknen von Kunststoffgranulaten mittels Mikrowelle
WO2004071744A1 (fr) * 2003-02-04 2004-08-26 Agro Fibres Technologies-Plasturgie Sas Procede et appareillage pour incorporer une forte proportion de fibres naturelles coupees dans une matiere plastique, produits obtenus et applications
WO2004113812A1 (fr) * 2003-06-20 2004-12-29 Amut S.P.A. Dispositif et methode pour chauffer, secher et/ou cristalliser des matieres plastiques

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9374853B2 (en) 2013-02-08 2016-06-21 Letourneau University Method for joining two dissimilar materials and a microwave system for accomplishing the same

Also Published As

Publication number Publication date
DE102005059965A1 (de) 2007-06-28

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