WO1998012035A1 - Procede pour le formage de matieres moulables thermoplastiques en poudre, thermiquement instables - Google Patents

Procede pour le formage de matieres moulables thermoplastiques en poudre, thermiquement instables Download PDF

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Publication number
WO1998012035A1
WO1998012035A1 PCT/DE1997/001969 DE9701969W WO9812035A1 WO 1998012035 A1 WO1998012035 A1 WO 1998012035A1 DE 9701969 W DE9701969 W DE 9701969W WO 9812035 A1 WO9812035 A1 WO 9812035A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaping
thermoplastic molding
powdery
thermally unstable
compounds
Prior art date
Application number
PCT/DE1997/001969
Other languages
German (de)
English (en)
Inventor
Klaus Metzner
Marion Sela
Kerstin Wengemuth
Hans-Joachim Radusch
Thomas LÜPKE
Original Assignee
Buna Sow Leuna Olefinverbund 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 Buna Sow Leuna Olefinverbund Gmbh filed Critical Buna Sow Leuna Olefinverbund Gmbh
Priority to CA002267357A priority Critical patent/CA2267357A1/fr
Priority to EP97954859A priority patent/EP0944463A1/fr
Publication of WO1998012035A1 publication Critical patent/WO1998012035A1/fr

Links

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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/16—Forging
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/003—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor characterised by the choice of material
    • 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping in several steps
    • 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
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • 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
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder 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
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/253—Preform
    • B29K2105/255—Blocks or tablets

Definitions

  • the invention relates to a method for shaping131-shaped, thermally unstable thermoplastic molding compositions, in particular for the production of semi-finished products or molded parts.
  • thermoplastic molding compositions can be converted into a molten state by the application of heat, in which compression and shaping of the material can be carried out effectively using suitable technologies (e.g. compression molding, extrusion, injection molding).
  • suitable technologies e.g. compression molding, extrusion, injection molding.
  • stabilizers, plasticizers, etc. an increase in the resistance to thermal degradation can be achieved.
  • it is often not possible to use these substances if there are high demands on the purity of the molding compounds (e.g. when used in medical technology or in the food industry).
  • Solid-phase extrusion techniques are known for the molding of plastics in the solid state, in which a preform of defined dimensions is pressed through a conical nozzle at temperatures below the melting temperature (NE Weeks, S Mon, RS Porter Journal of Polymer Science, Polymer Physics 13 (1975) 2031 , YD Wang, T Yamamoto, M Cakmak ANTEC'96 S 1654-1665)
  • the goal of solid-phase extrusion is the production of highly oriented structures with improved strength properties.
  • a disadvantage of this in particular for thermally sensitive polymers is that the material in the molten material is used to produce the preform Condition is transferred.
  • the invention has for its object to process powdery, thermally and also hydrolytically unstable thermoplastic molding compositions so that they can be further processed as semifinished products or represent usable moldings.
  • the thermal degradation processes that take place in the processing of thermoplastic molding compositions are to be prevented, so that the semifinished products or moldings are prevented a high level of mechanical properties are characterized
  • thermoplastic molding compounds can be, for example, preferred polyolefins, polyamides or polyesters
  • thermally unstable polymers such as, for example, biodegradable polymers, in particular polylactides and polyhydroxyalkanoates, and copolymers thereof are used.
  • the initially powdery starting material is precompressed to a preform in a first process step using hydrostatic pressure.This is done with the aim of minimizing thermal damage, preferably at room temperature, but it can also be carried out at elevated temperatures, but in any case well below the melting temperature.
  • the pressure must be chosen so that the density of the preform reaches about 75 to 90% of the bulk density of the polymer material
  • the pre-compressed preform is subjected to deviatoric stress in a second step, extrusion.
  • deviatoric stress in a second step, extrusion.
  • the mutual penetration of neighboring particles takes place as a result of molecular movement processes in the boundary layer, as well as the removal of existing micropores in the material.
  • the desired geometry of the molded part or semifinished product is formed by means of targeted form constraint.
  • the preform can be produced at room temperature
  • flow processes under deviatoric stress must be carried out at elevated temperatures in the range between glass and melting temperature, preferably at temperatures from 0.8 to 0.95 T m [K], in order to ensure intensive penetration
  • the load under deviatoric stress is expediently chosen depending on the type of polymer material and the forming temperature in such a way that forming ratios of 1, 5 -, ⁇ ⁇ 3 are achieved.
  • the deformation is preferably carried out under continuously increasing stress .
  • the powdery thermoplastic molding compound can also contain fillers and / or Reinforcing agents such as calcium phosphates are added.
  • the molded parts and semi-finished products produced according to the invention are distinguished by a property level which is considerably improved in comparison to products of conventional processing technologies.
  • a property level which is considerably improved in comparison to products of conventional processing technologies.
  • strength, ductility and toughness they are clearly superior to products that have been processed in the melt state, but also hydrostatically pressed in the solid state and products that are solidified by sintering.
  • PHB polyhydroxybutyrate
  • the density of the material is increased to 1.25 g / cm 3 by extrusion. Associated with this are significant improvements in mechanical properties, in particular tensile strength and elongation at break. Molecular degradation processes cannot be demonstrated.
  • Selected characteristic values of the semi-finished products manufactured according to different processes in Figure 1 document the superiority of the extrusion technology according to the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Materials For Medical Uses (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)

Abstract

L'invention a pour but de façonner des matières moulables thermoplastiques en poudre, thermiquement instables, pour l'obtention de produits semi-finis ou de pièces moulées, de telle façon que les processus de dégradation thermiques soient entravés, et que les produits semi-finis et les pièces moulées possèdent des propriétés mécaniques de haut niveau. Ce but est atteint grâce au fait que la matière moulable thermoplastique en poudre, qui est précomprimée sous la pression hydrostatique, est exposée à une contrainte de déformation au-dessous de sa température de fusion.
PCT/DE1997/001969 1996-09-18 1997-09-05 Procede pour le formage de matieres moulables thermoplastiques en poudre, thermiquement instables WO1998012035A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CA002267357A CA2267357A1 (fr) 1996-09-18 1997-09-05 Procede pour le formage de matieres moulables thermoplastiques en poudre, thermiquement instables
EP97954859A EP0944463A1 (fr) 1996-09-18 1997-09-05 Procede pour mouler des composes thermoplastiques pulverantes, thermiquement instabiles

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19637904.0 1996-09-18
DE1996137904 DE19637904A1 (de) 1996-09-18 1996-09-18 Verfahren zur Formgebung von pulverförmigen, thermisch instabilen Thermoplastformmassen

Publications (1)

Publication Number Publication Date
WO1998012035A1 true WO1998012035A1 (fr) 1998-03-26

Family

ID=7805916

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1997/001969 WO1998012035A1 (fr) 1996-09-18 1997-09-05 Procede pour le formage de matieres moulables thermoplastiques en poudre, thermiquement instables

Country Status (4)

Country Link
EP (1) EP0944463A1 (fr)
CA (1) CA2267357A1 (fr)
DE (1) DE19637904A1 (fr)
WO (1) WO1998012035A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10054431B4 (de) * 2000-10-26 2009-12-03 Volkswagen Ag Verfahren zum Lackieren eines Kunststoff-Karosserieteils sowie Tempergestell
US9475217B2 (en) 2013-01-31 2016-10-25 Saudi Basic Industries Corporation Process for making highly crystalline shaped part from pet or pen

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2025949A1 (de) * 1969-05-28 1970-12-03 Carborundum Co Verfahren zum Formen von Polyestern
US4014965A (en) * 1972-11-24 1977-03-29 The Dow Chemical Company Process for scrapless forming of plastic articles
US4323531A (en) * 1971-03-01 1982-04-06 The Dow Chemical Company Process for forming a plastic article
FR2602454A1 (fr) * 1986-08-11 1988-02-12 Medico Chirurgical Intern Off Procede et dispositif permettant d'obtenir des pieces en polymere forgees, et application des pieces ainsi obtenues a la preparation de protheses orthopediques
DE4308239A1 (de) * 1992-12-08 1994-06-09 Artos Med Produkte Verfahren zur Herstellung eines Formkörpers für die Osteosynthese
US5529736A (en) * 1994-08-10 1996-06-25 Clemson University Process of making a bone healing device
WO1997010010A1 (fr) * 1995-09-14 1997-03-20 Takiron Co., Ltd. Materiau d'osteosynthese, materiau d'implant composite et procede de preparation dudit materiau

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL6816523A (fr) * 1967-11-22 1969-05-27
DE3002910A1 (de) * 1980-01-28 1981-07-30 Basf Ag, 6700 Ludwigshafen Verfahren zur herstellung eines formkoerpers aus pulver- bis granulatfoermigem thermoplastischem kunststoff
DE3611688A1 (de) * 1986-04-08 1987-10-22 Hansa Metallwerke Ag Verfahren und vorrichtung zur herstellung eines kunststoff-formkoerpers
DE3611687A1 (de) * 1986-04-08 1987-10-15 Hansa Metallwerke Ag Verfahren zur herstellung von kunststoff-formkoerpern
DE4012851A1 (de) * 1990-04-19 1991-10-24 Gerhard Dr Ing Frey Verfahren und vorrichtung zum fertigen von hochfesten bauteilen und gegenstaenden aus kunststoff durch verfahren des umformens

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2025949A1 (de) * 1969-05-28 1970-12-03 Carborundum Co Verfahren zum Formen von Polyestern
US4323531A (en) * 1971-03-01 1982-04-06 The Dow Chemical Company Process for forming a plastic article
US4014965A (en) * 1972-11-24 1977-03-29 The Dow Chemical Company Process for scrapless forming of plastic articles
FR2602454A1 (fr) * 1986-08-11 1988-02-12 Medico Chirurgical Intern Off Procede et dispositif permettant d'obtenir des pieces en polymere forgees, et application des pieces ainsi obtenues a la preparation de protheses orthopediques
DE4308239A1 (de) * 1992-12-08 1994-06-09 Artos Med Produkte Verfahren zur Herstellung eines Formkörpers für die Osteosynthese
US5529736A (en) * 1994-08-10 1996-06-25 Clemson University Process of making a bone healing device
WO1997010010A1 (fr) * 1995-09-14 1997-03-20 Takiron Co., Ltd. Materiau d'osteosynthese, materiau d'implant composite et procede de preparation dudit materiau
EP0795336A1 (fr) * 1995-09-14 1997-09-17 Takiron Co. Ltd. Materiau d'osteosynthese, materiau d'implant composite et procede de preparation dudit materiau

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
WANG Y D: "PROCESSING CHARACTERISTICS AND STRUCTURE DEVELOPMENT IN SOLID STATE EXTRUSION OF BACTERIAL COPOLYESTERS", ANTEC '96 (SOCIETY OF PLASTICS ENGINEERS), 5 May 1996 (1996-05-05) - 10 May 1996 (1996-05-10), BROOKFIELD US, pages 1654 - 1665, XP002052506 *
WEEKS NORMAN E: "THE MORPHOLOGY OF ULTRADRAWN POLYETHYLENE", JOURNAL OF POLYMER SCIENCE, POLYMER PHYSICS EDITION., vol. 13, 1975, NEW YORK US, pages 2031 - 2048, XP002052507 *

Also Published As

Publication number Publication date
CA2267357A1 (fr) 1998-03-26
EP0944463A1 (fr) 1999-09-29
DE19637904A1 (de) 1998-03-19

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