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DE2801990A1 - Reducing the shrinkage of cast polyamide mouldings - by adding an inorganic filler to the molten activated lactam monomer casting mixt. - Google Patents

Reducing the shrinkage of cast polyamide mouldings - by adding an inorganic filler to the molten activated lactam monomer casting mixt.

Info

Publication number
DE2801990A1
DE2801990A1 DE19782801990 DE2801990A DE2801990A1 DE 2801990 A1 DE2801990 A1 DE 2801990A1 DE 19782801990 DE19782801990 DE 19782801990 DE 2801990 A DE2801990 A DE 2801990A DE 2801990 A1 DE2801990 A1 DE 2801990A1
Authority
DE
Germany
Prior art keywords
shrinkage
filler
glass
mouldings
microballoons
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Withdrawn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
DE19782801990
Other languages
German (de)
Inventor
Wolfgang Dipl Chem D Anselment
Gerhard Rauscher
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch 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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to DE19782801990 priority Critical patent/DE2801990A1/en
Publication of DE2801990A1 publication Critical patent/DE2801990A1/en
Withdrawn legal-status Critical Current

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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/003—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor characterised by the choice of material
    • B29C39/006—Monomers or prepolymers
    • 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
    • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
    • B29C39/22—Component parts, details or accessories; Auxiliary operations
    • B29C39/40—Compensating volume change, e.g. retraction
    • 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
    • C08K3/01—Use of inorganic substances as compounding ingredients characterized by their specific function
    • C08K3/013—Fillers, pigments or reinforcing additives
    • 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
    • B29K2077/00—Use of PA, i.e. polyamides, e.g. polyesteramides 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • 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
    • B29K2709/00—Use of inorganic materials not provided for in groups B29K2703/00 - B29K2707/00, for preformed parts, e.g. for inserts
    • B29K2709/08—Glass

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyamides (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

The shrinkage of cast polyamide mouldings made by anionic activated polymerisation of lactams is reduced by mixing the original melt of monomeric caprolactam, catalyst and activator with a filler. Suitable fillers are e.g. magnesium-, aluminium- or magnesium-aluminium, silicates, perlite, glass fibres, glass microspheres of glass microballoons. Pref. compsns. contain 15-25%, esp. 22 wt.% of a filler comprising glass microballoons with an average particle size of 80 mu and a density of 0.34g/cm3. Addn. of the filler gives mouldings with reduced shrinkage and greater precision. Glass microsphere fillers neither sink nor float and, besides high moulding tolerance, give mouldings of lower density and improve contour precision.

Description

Stand der TechnikState of the art

Formteile aus Gußpolyamid, die mittels der anionischen aktivierten Polymerisation von Lactamen hergestellt werden, weisen einen hohen Schwund von maximal 3 bis II % auf. Ein derart hoher Schwund bewirkt, daß der Anwendungsbereich dieses Verfahrens stark eingeengt wird.Molded parts made of cast polyamide, which are activated by means of the anionic Polymerization produced by lactams have a high shrinkage of a maximum 3 to II%. Such a high shrinkage causes the scope of this Procedure is severely narrowed.

Eine Verminderung der Schwindung durch Zugabe von physikalischen Treibmitteln, wie z.B. Xylol oder Toluol ist nicht möglich. Bei Verwendung chemischer Treibmittel wie z.B. Azodicarbonamid läßt sich die Schwindung beachtlich vermindern, jedoch verursachen diese Stoffe gußtechnische Probleme. Weiterhin wurde festgestellt, daß sich der Schwund durch Variation der Misc.ungs- und Frmtemperatur nur geringfügig beeinflussen läjt. Außerdem ist ein Verminderung des Schwundes durch Änderung der Katalysator- und Aktivatormenge nicht möglich.A reduction in shrinkage by adding physical blowing agents, such as xylene or toluene is not possible. When using chemical propellants such as azodicarbonamide, however, the shrinkage can be considerably reduced these substances cause casting problems. It was also found that the shrinkage is only slightly due to variation of the mixing and molding temperature influence läjt. In addition, there is a reduction in shrinkage by changing the Amount of catalyst and activator not possible.

Vorteile der Erfindung Das erfindungagemäße Verfahren nach dem Hauptanspruch Crt gegenüber em Stand der Technik den Vorteil, daß die Schwund dung der Formteile erheblich vermindert und somit die Maßgenauigkeit erhöht wird. Außerdem wird beim Verfahren nach Anspruch 4 das Teilegewicht und der Verzug der Formteile vermindert und die Konturengenauigkeit verbessert. Weiterhin ist von Vorteil, daß die Microballoons die Polymerisation nicht stören und in der Schmelze weder absinken noch emporsteigen. Durch die Beimengung der Microballoons nimmt zwar die Viskosität der Ausgangsschmelze zu, aber aufgrund des Kugellagereffektes der Mieroballoons lassen sich auch dünnwandige Formteile gießen. Bei Verwendung von Microb@llo@@@ wird mit einem Gewichtsanteil nach Anspruch 6 der niedrigste Schwundwert erreicht.Advantages of the invention The method according to the invention according to the main claim Crt has the advantage over em prior art that the shrinkage of the molded parts considerably reduced and thus the dimensional accuracy is increased. In addition, the Method according to Claim 4, the weight of the parts and the distortion of the molded parts are reduced and the contour accuracy is improved. Another advantage is that the microballoons do not interfere with the polymerization and neither sink nor rise in the melt. By adding the microballoons it increases the viscosity the starting melt, but due to the ball bearing effect of the Mieroballoons thin-walled molded parts can also be cast. When using Microb @ llo @@@ the lowest shrinkage value is achieved with a weight fraction according to claim 6.

Beschreibung der Erfindung In an sich bekannter ileise wird die anionische aktivierte Polymerisation von Caprolactam durchgeführt, wobei die eine Hälfte der bei 1600 C vorgetrockneten Mieroballoonmenge in eine aufgeschmolzene Komponente A, bestehend aus Caprolactarr und Katalysator, und die andere Hälfte in eine aufgeschnolzene Komponente B, bestehend aus Caprolactam und Aktivator, eingeführt wird. Bei der Anwendung des erfindungsgemäßen Verfahrens nach Anspruch 6 unter Fertigungsbedingungen uß das Mischen der Komponente A und B mit einer geeigneten Erorrichtung durchgeführt werden. Außerdem sind unter Umständen besondere Gießtechniken erforderlich.Description of the invention In a manner known per se, the anionic activated polymerization of caprolactam carried out, one half of which Mieroballoon pre-dried at 1600 C into a melted component A, consisting of caprolactar and catalyst, and the other half in a melted one Component B, consisting of caprolactam and activator, is introduced. In the Application of the method according to the invention according to claim 6 under manufacturing conditions The mixing of components A and B is carried out with a suitable device will. In addition, special casting techniques may be required.

Mit den erfindungsgemäßen Füllstoffen wird folgender Schwund errcht: Füllstoff Füllstoff Füllstoff Schwund Dichte g/cm3 ohne 0 3,7 Talkum 427 2,7 40 2,2 Mica-Glimmer 1,8 25 1,8 Plastorit-Naintsch t0' 2,7 50 1,9 Ballotini-Microglas- 2,5 74 1,1 kugeln 3000 Perlite PA 1000 - 20 1,2 Mieroballoons IG 101 0,3 22 1,8 Glasfaser: Vitro- - 60 1,5 Strand, Type 0,4 mmThe following shrinkage is achieved with the fillers according to the invention: Filler filler filler shrinkage density g / cm3 without 0 3.7 talc 427 2.7 40 2.2 Mica mica 1.8 25 1.8 Plastorit-Naintsch t0 '2.7 50 1.9 Ballotini-Microglas- 2.5 74 1.1 spheres 3000 Perlite PA 1000 - 20 1.2 Mieroballoons IG 101 0.3 22 1.8 Glass fiber: Vitro- - 60 1.5 strand, type 0.4 mm

Claims (1)

Ansprüche 1. Verfahren zur Verminderung des Schwundes von Formteilen aus Gußpolyamid hergestellt mit Hilfe der anionischen aktivierten Polymerisation von Lactamen, dadurch gekennzeichnet, daß der aus monomerem Caprolactam, Katalysator und Aktivator bestehenden Ausgangsschrnelze ein Füllstoff beigemengt wird. i 2. Verfahren nach Anspruch 1, dadurch gekennzelchnet, daß als Füllstoff itagnesium-, Aluminium- oder Magnesium-Aluminium-Silicate, sowie Perlit oder Glasfasern verwendet werden.Claims 1. A method for reducing the shrinkage of molded parts Made from cast polyamide using anionic activated polymerisation of lactams, characterized in that that of monomeric caprolactam, catalyst and activator, a filler is added to the existing starting melt. i 2. Method according to claim 1, characterized in that itagnesium-, Aluminum or magnesium-aluminum silicates, as well as perlite or glass fibers are used will. 3. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß als Füllstoff Micro-Glaskugeln verwendet werden. j 4. Insbesondere Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß als Füllstoff Micro-Glashohlkugeln verwendet werden.3. The method according to claim 1, characterized in that as a filler Micro glass spheres can be used. j 4. In particular, the method according to claim 3, characterized in that hollow glass microspheres are used as filler. 5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, daß die Glashohikugeln sogenannte Microballoons sind mit einer durchschnittlichen Teilgröße von 80 P und einer Dichte von 0,34 g/cm3.5. The method according to claim 4, characterized in that the glass hollow spheres so-called microballoons are with an average part size of 80 P and a density of 0.34 g / cm3. 6. Verfahren nach Anspruch 4 oder 5, dadurch gekennzeichnet, daß die Microballoons in einem Gewichtsanteil von 15 bis 25 %, vorzugsweise von 22 , dem Polymerisat beigement sind.,/ 7. Verfahren nawh Anspruch 1, dadurch gekennzeichnet, daß als Füllstoff eine Mischung aus Microballoons nach Anspruch 5 und aus Füllstoffen nach Anspruch 2 und 3 verwendet werden.6. The method according to claim 4 or 5, characterized in that the Microballoons in a weight proportion of 15 to 25%, preferably 22, the Polymerizat are included., / 7. The method according to claim 1, characterized in that that the filler is a mixture of microballoons according to claim 5 and fillers according to claim 2 and 3 can be used.
DE19782801990 1978-01-18 1978-01-18 Reducing the shrinkage of cast polyamide mouldings - by adding an inorganic filler to the molten activated lactam monomer casting mixt. Withdrawn DE2801990A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19782801990 DE2801990A1 (en) 1978-01-18 1978-01-18 Reducing the shrinkage of cast polyamide mouldings - by adding an inorganic filler to the molten activated lactam monomer casting mixt.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19782801990 DE2801990A1 (en) 1978-01-18 1978-01-18 Reducing the shrinkage of cast polyamide mouldings - by adding an inorganic filler to the molten activated lactam monomer casting mixt.

Publications (1)

Publication Number Publication Date
DE2801990A1 true DE2801990A1 (en) 1979-07-19

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Family Applications (1)

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Country Status (1)

Country Link
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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2579518A1 (en) * 1985-03-29 1986-10-03 Atochem POLYAMIDE COATED PARTICLES AND PROCESS FOR PREPARING THE SAME
DE3712959A1 (en) * 1987-04-02 1988-10-20 Schock & Co Gmbh TOWEL-PLASTIC PLASTIC SANITATION OBJECT, IN PARTICULAR BATHTUB
FR2662970A1 (en) * 1990-06-06 1991-12-13 Ayre Sauvetre Method of moulding a filled polyester resin, irrespective of the volume or the shape of the component to be obtained using this technique
WO1993005941A1 (en) * 1991-09-13 1993-04-01 Imperial Chemical Industries Plc A method for preparing a fibre reinforced polymer composite
DE19602638A1 (en) * 1996-01-25 1997-08-07 Inventa Ag Process for the production of thermally deformable composite materials with polylactam matrix
NL1003609C2 (en) * 1996-07-16 1998-01-21 Stichting I W L World Building Polyamide molded part, a method for its manufacture and use.
US6432343B1 (en) 1999-02-12 2002-08-13 Mannesmann Ag Process of manufacturing rotationally symmetrical articles
GB2437644A (en) * 2006-04-25 2007-10-31 Univ Reading Polymer composition containing solid adsorbent
US8075835B2 (en) 1999-07-27 2011-12-13 Cmt Materials, Inc. Method of thermoforming using a syntactic foam plug

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2579518A1 (en) * 1985-03-29 1986-10-03 Atochem POLYAMIDE COATED PARTICLES AND PROCESS FOR PREPARING THE SAME
EP0196972A1 (en) * 1985-03-29 1986-10-08 Elf Atochem S.A. Polyamide-coated particles and method for their manufacture
DE3712959A1 (en) * 1987-04-02 1988-10-20 Schock & Co Gmbh TOWEL-PLASTIC PLASTIC SANITATION OBJECT, IN PARTICULAR BATHTUB
FR2662970A1 (en) * 1990-06-06 1991-12-13 Ayre Sauvetre Method of moulding a filled polyester resin, irrespective of the volume or the shape of the component to be obtained using this technique
WO1993005941A1 (en) * 1991-09-13 1993-04-01 Imperial Chemical Industries Plc A method for preparing a fibre reinforced polymer composite
EP0791618A2 (en) 1996-01-25 1997-08-27 Ems-Inventa Ag Process for preparing thermally reshapable composite materials with polylactam matrix
DE19602638A1 (en) * 1996-01-25 1997-08-07 Inventa Ag Process for the production of thermally deformable composite materials with polylactam matrix
US5895808A (en) * 1996-01-25 1999-04-20 Ems-Inventa Ag Process for producing compound materials with a polylactam matrix which can be thermally postformed
EP0791618B1 (en) * 1996-01-25 2001-11-21 Ems-Inventa Ag Process for preparing thermally reshapable composite materials with polylactam matrix
NL1003609C2 (en) * 1996-07-16 1998-01-21 Stichting I W L World Building Polyamide molded part, a method for its manufacture and use.
WO1998002481A1 (en) * 1996-07-16 1998-01-22 Stichting I.W.L. World Building Brick Polyamide moulding, a process for the manufacture thereof and the use thereof
US6432343B1 (en) 1999-02-12 2002-08-13 Mannesmann Ag Process of manufacturing rotationally symmetrical articles
US8075835B2 (en) 1999-07-27 2011-12-13 Cmt Materials, Inc. Method of thermoforming using a syntactic foam plug
GB2437644A (en) * 2006-04-25 2007-10-31 Univ Reading Polymer composition containing solid adsorbent
GB2437644B (en) * 2006-04-25 2010-04-07 Univ Reading Process for the manufacture of a polymer composition

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