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DE2102867A1 - Low-pressure polyethylene composns - for rotational casting contg lubricant,glass fibres and peroxide - Google Patents

Low-pressure polyethylene composns - for rotational casting contg lubricant,glass fibres and peroxide

Info

Publication number
DE2102867A1
DE2102867A1 DE19712102867 DE2102867A DE2102867A1 DE 2102867 A1 DE2102867 A1 DE 2102867A1 DE 19712102867 DE19712102867 DE 19712102867 DE 2102867 A DE2102867 A DE 2102867A DE 2102867 A1 DE2102867 A1 DE 2102867A1
Authority
DE
Germany
Prior art keywords
low
pressure polyethylene
polyethylene
peroxide
lubricant
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.)
Pending
Application number
DE19712102867
Other languages
German (de)
Inventor
Alfred 8000 München. P Böckmann
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.)
Mannesmann Demag Krauss Maffei GmbH
Original Assignee
Krauss Maffei AG
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 Krauss Maffei AG filed Critical Krauss Maffei AG
Priority to DE19712102867 priority Critical patent/DE2102867A1/en
Publication of DE2102867A1 publication Critical patent/DE2102867A1/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
    • C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L23/04—Homopolymers or copolymers of ethene
    • C08L23/06—Polyethene
    • 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; 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
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
    • 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
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • 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
    • B29K2309/00—Use of inorganic materials not provided for in groups B29K2303/00 - B29K2307/00, as reinforcement
    • B29K2309/08—Glass

Landscapes

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

Abstract

The compsns. are based on low pressure olyethylene of particle size 100-1000 mu, with addition of glass fibres, pref. 10-30% w.r.t. polyethylene, peroxide, pref. 0.3-8%, and lubricant, e.g. stearic acid, paraffin wax, dyes. The additives are pref. charged directly with the polyethylene to the casting machine, without premixing. The compsns. are esp. suitable for oil-heated casting machines heated from the outside only. The polyethylene of varying particle size con be used in the polymerised form, without further grinding, and susceptibility of the cast product to stress cracking and sunlight is overcome.

Description

Verwendung von Niederdruckpolyäthylen zur Verarbeitung in Rotationsgießmaschinen Die Erfindung betrifft die Verwendung von Niederdruckpolyethylen zur Verarbeitung in Rotationsgießi'aschinen, insbesonders in ölbeheizten Rotationsgießmaschinen,in denen die Formen lediglich von außen beheizt werden. Use of low-pressure polyethylene for processing in rotary casting machines The invention relates to the use of high density polyethylene for processing in rotary casting machines, especially in oil-heated rotary casting machines, in where the molds are only heated from the outside.

Die bisherige Verwendung von Niederdruckpolyäthylen in Rotationsgießmaschinen ist beschränkt auf Material slt einer Korngröße von größtenteils etwa 300 s. Die Größe ist deshalb notwendig, um ein zweckmäßiges Abrollen der Miterialteilchen in der Hohl form der Rotationsgießmaschine beim Sinterprozeß zu gewährleisten und Anbackungen und Agglomerate zu vermeiden. Die Herstellung dieser Korngröße erfordert, da das Material nach der Polynerisation in einer nicht definierten Korngröße zwischen 100 und 1 000 t anfällt, einen Mahlprozeß, der sich erhiblich im Preis des Materials niederschlägt.The previous use of low pressure polyethylene in rotary casting machines is limited to material with a grain size of mostly around 300 s Size is therefore necessary in order for the miterial particles to roll properly in to ensure the hollow shape of the rotary casting machine during the sintering process and caking and avoid agglomerates. The production of this grain size requires that Material after polymerization in an undefined grain size between 100 and 1,000 t is produced, a grinding process that is affordable in the price of the material precipitates.

Der Verwendung von Niederdruckpolyäthylen in Rotationsgieß-Maschinen steht ferner die Spannungsrißanfälligkeit und die Anfälligkeit des Produkts gegen atmosphärische Einflasse, insbesondere Sonneneinstrahlung, entgegen.The use of low pressure polyethylene in rotary molding machines is also the susceptibility to stress cracking and the Susceptibility of Product against atmospheric influences, especially solar radiation.

Der Erfindung liegt die Aufgabe zugrunde, einen Weg zu finden, Niederdruckpolyäthylen mit Erfolg in Rotationsgießmaschinen verarbeiten zu können. Erfindungsgemäß wird vorgeschlagen, daß Niederdruckpolyäthylen in nicht definierten Korngrößen, also in Korngrößen zwischen 100 und 1 000 ym, zusammen mit Gleitmitteln (s.B. Stearinsäure, Paraffin, Farbstoff), Glasfasern und Peroxyden verarbeitet wird. Die Verwendung der genannten Zusatzmaterialien bewirkt, daß die Zugabe von Peroxyd die Anfälligkeit gegen Rißbildung und atmosphärische Einflüsse behebt und die dadurch hervorgerufene Minderung des E-Moduls und der Stabilität des Produkts durch die Zugabe von Glasfasern ausgeglichen wird.The invention has for its object to find a way to use low-pressure polyethylene to be able to process with success in rotary casting machines. According to the invention suggested that low-pressure polyethylene in undefined grain sizes, so in grain sizes between 100 and 1,000 μm, together with lubricants (see e.g. stearic acid, Paraffin, dye), glass fibers and peroxides. The usage of the mentioned additional materials causes the addition of peroxide the susceptibility against cracking and atmospheric influences and the resulting Reduction of the modulus of elasticity and the stability of the product due to the addition of glass fibers is balanced.

Der Zusatz von Gleitmitteln ermöglicht, auf definierte Korngrößen zu verzichten.The addition of lubricants makes it possible to achieve defined grain sizes to renounce.

Diq Gesamtheit dieser teilweise an sich bekannten Merkmale läßt die Verarbeitung von Niederdruckpolyäthylen in Rotationsgießmaschinen in einer bisher nicht bekannten und unerwartet günstigen Weise zu, insbesonders in ölbeheizten Rotationsgießmaschinen, da die bei der Verwendung von Peroxyden entstehenden gefährlichen Dämpfe ohne weiteres ins Freie geleitet werden können. Denn es handelt sich hier um einen drucklosen Verarbeitungsprozeß im Gegensatz zu Inektions-oder Preßverfahren.The entirety of these features, some of which are known per se, allows the Processing of low-pressure polyethylene in rotary casting machines in a previously unknown and unexpectedly favorable ways, especially in oil-heated rotary casting machines, because the dangerous vapors produced when using peroxides are readily available can be directed outside. Because this is a pressureless one Processing process as opposed to injection or pressing processes.

Die erfindungsgemäß hergestellten Produkte zeichnen sich darüber hinaus durch so gute technologische Eigenschaften aus, wie sie bisher beim Rotationsgießen noch nicht erzielt worden sind.The products produced according to the invention are also distinguished due to such good technological properties as they have been with rotational molding up to now have not yet been achieved.

Due genannten Beigaben zu Niederdruckpolyäthylen können vor dem Gießprozeß in einer Mischkammer gemischt und dann der Form zugegeben werden. Besomders zweckmäßig ist jedoch, wenn das Niederdruckpolyäthylen mit den Gleitmitteln, Glasfasern und Peroxiden getrennt unitittelbar den Formen der Rotationsgießmaschine zugeführt wird.The mentioned additives to low-pressure polyethylene can be made before the casting process mixed in a mixing chamber and then added to the mold. Besomders expedient is, however, when the low pressure polyethylene with the lubricants, glass fibers and Peroxides is fed separately to the molds of the rotary casting machine.

Günstige zugabevberhältnisse sind bei Glasfasern etwa 10 bis 30, bei Peroxiden 0,3 bis 8 Gewichtsprozente, bezogen auf Niederdruckpolyäthylen. Besonders gute Stabilitätseigenschaften werden erzielt, wenn die Glasfasern eine Länge gleich oder kleiner als 10 mm, vorzugsweise von 6 bis 8 mm, aufweisen.Favorable addition ratios are around 10 to 30 for glass fibers Peroxides 0.3 to 8 percent by weight, based on low-pressure polyethylene. Particularly good stability properties are achieved if the glass fibers have the same length or smaller than 10 mm, preferably from 6 to 8 mm.

Claims (5)

PatentansprUcheClaims 1) Verwendung von Niederdruckpolyäthylen zur Verarbeitung in Rotationsgießmaschinen, insbesondere in ölbeheizten Rotationsgießmaschinen, in denen die Formen lediglich von außen beheizt werden, dadurch gekennzeichnet, daß Niederdruckpolyäthylen in nicht definierten Korngrößen, also in Korngrößen zwischen 100 und 1000 µm, zusammen mit Gleitmitteln (z.B. Stearinsäure, Paraffin, Farbstoffe), Glasfasern und Peroxiden verarbeitet wird.1) Use of low-pressure polyethylene for processing in rotary casting machines, especially in oil-heated rotary casting machines in which the molds only are heated from the outside, characterized in that low-pressure polyethylene in undefined grain sizes, i.e. in grain sizes between 100 and 1000 µm with lubricants (e.g. stearic acid, paraffin, dyes), glass fibers and peroxides is processed. 2. Verfahren zur Verwendung nach Anspruch 1, dadurch gekennzeichnet, daß das Niederdruckpolyäthylen mit den Gleitmitteln, Glasfasern und Peroxyden getrennt unmittelbar den Formen der Rotationsgießmaschine zugeführt wird.2. The method of use according to claim 1, characterized in that that the low-pressure polyethylene separated with the lubricants, glass fibers and peroxides is fed directly to the molds of the rotary casting machine. 3. Verwendung nach Anspruch 1, dadurch gekennzeichnet, daß der Anteil der Glasfasern etwa 10 bis 30 Gewichtsprozente des Niederdruckpolylthylens beträgt.3. Use according to claim 1, characterized in that the proportion of the glass fibers is about 10 to 30 percent by weight of the low pressure polyethylene. 4. Verwendung nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß der Anteil der Peroxyde etwa 0,3 bis 8 Gewichtsprozente, bezogen auf Niederdruckpol7äthylen, beträgt.4. Use according to claim 1 or 3, characterized in that the proportion of peroxides about 0.3 to 8 percent by weight, based on low-pressure polyethylene, amounts to. 5. Verwendung nach Anspruch 1 oder 3, dadurch gekennzeichnet, daß die Glasfasern eine Länge gleich oder kleiner als 10 mm, vorzugsweise von 6 bis 8 mm, aufweisen.5. Use according to claim 1 or 3, characterized in that the glass fibers have a length equal to or less than 10 mm, preferably from 6 to 8 mm.
DE19712102867 1971-01-22 1971-01-22 Low-pressure polyethylene composns - for rotational casting contg lubricant,glass fibres and peroxide Pending DE2102867A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19712102867 DE2102867A1 (en) 1971-01-22 1971-01-22 Low-pressure polyethylene composns - for rotational casting contg lubricant,glass fibres and peroxide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712102867 DE2102867A1 (en) 1971-01-22 1971-01-22 Low-pressure polyethylene composns - for rotational casting contg lubricant,glass fibres and peroxide

Publications (1)

Publication Number Publication Date
DE2102867A1 true DE2102867A1 (en) 1972-08-17

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ID=5796579

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19712102867 Pending DE2102867A1 (en) 1971-01-22 1971-01-22 Low-pressure polyethylene composns - for rotational casting contg lubricant,glass fibres and peroxide

Country Status (1)

Country Link
DE (1) DE2102867A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945805A1 (en) * 1978-12-22 1980-07-10 Eurometaal Nv METHOD FOR PRODUCING SPLIT-RESISTANT PLASTIC MATERIALS FOR MILITARY COMBUSTION BODIES

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2945805A1 (en) * 1978-12-22 1980-07-10 Eurometaal Nv METHOD FOR PRODUCING SPLIT-RESISTANT PLASTIC MATERIALS FOR MILITARY COMBUSTION BODIES

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