DE10049757A1 - Rotational casting of hollow plastic moldings, involves molding and reacting of polyurethane pre-products and additives - Google Patents
Rotational casting of hollow plastic moldings, involves molding and reacting of polyurethane pre-products and additivesInfo
- Publication number
- DE10049757A1 DE10049757A1 DE2000149757 DE10049757A DE10049757A1 DE 10049757 A1 DE10049757 A1 DE 10049757A1 DE 2000149757 DE2000149757 DE 2000149757 DE 10049757 A DE10049757 A DE 10049757A DE 10049757 A1 DE10049757 A1 DE 10049757A1
- Authority
- DE
- Germany
- Prior art keywords
- plastic
- production
- hollow bodies
- polyurethane
- bodies made
- 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- Withdrawn
Links
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 11
- 239000004814 polyurethane Substances 0.000 title claims abstract description 11
- 239000000654 additive Substances 0.000 title claims abstract description 5
- 238000000465 moulding Methods 0.000 title description 2
- 238000010137 moulding (plastic) Methods 0.000 title 1
- 238000010106 rotational casting Methods 0.000 title 1
- 238000000034 method Methods 0.000 claims description 16
- 239000004033 plastic Substances 0.000 claims description 12
- 229920003023 plastic Polymers 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 9
- 238000004519 manufacturing process Methods 0.000 claims description 8
- 238000005266 casting Methods 0.000 claims description 6
- 239000002243 precursor Substances 0.000 claims description 5
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 239000012948 isocyanate Substances 0.000 claims 2
- 150000002513 isocyanates Chemical class 0.000 claims 2
- 239000000049 pigment Substances 0.000 claims 2
- 239000004721 Polyphenylene oxide Substances 0.000 claims 1
- 230000032683 aging Effects 0.000 claims 1
- 239000002518 antifoaming agent Substances 0.000 claims 1
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000003995 emulsifying agent Substances 0.000 claims 1
- 239000012760 heat stabilizer Substances 0.000 claims 1
- 239000004611 light stabiliser Substances 0.000 claims 1
- 229920000728 polyester Polymers 0.000 claims 1
- 229920000570 polyether Polymers 0.000 claims 1
- 229920005862 polyol Polymers 0.000 claims 1
- 150000003077 polyols Chemical class 0.000 claims 1
- 238000001175 rotational moulding Methods 0.000 claims 1
- 239000003381 stabilizer Substances 0.000 claims 1
- 150000001875 compounds Chemical class 0.000 abstract 1
- 229920001944 Plastisol Polymers 0.000 description 3
- 239000004014 plasticizer Substances 0.000 description 3
- 239000004999 plastisol Substances 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000036541 health Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 235000016936 Dendrocalamus strictus Nutrition 0.000 description 1
- 239000008037 PVC plasticizer Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 210000001124 body fluid Anatomy 0.000 description 1
- 239000010839 body fluid Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 231100000206 health hazard Toxicity 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
-
- 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
- B29C41/06—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould about two or more axes
-
- 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
- B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
- B29C67/24—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00 characterised by the choice of material
- B29C67/246—Moulding high reactive monomers or prepolymers, e.g. by reaction injection moulding [RIM], liquid injection moulding [LIM]
-
- 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
- B29K2075/00—Use of PU, i.e. polyureas or polyurethanes 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
- B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
-
- 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
- B29K2105/0005—Condition, form or state of moulded material or of the material to be shaped containing compounding ingredients
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)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von Hohlkörpern aus Kunststoff im Rotationsguß-Verfahren, bei dem eine Metallform mit einer geeigneten Menge Kunststoff befüllt wird, bei dem die Form bei geeigneter Temperatur mehrachsig rotiert wird, bei dem der Kunststoff seine gewünschten Eigenschaften erhält und bei dem der Hohlkörper aus der Form entnommen wird.The invention relates to a method for producing hollow bodies made of plastic in Rotary molding process in which a metal mold with a suitable amount of plastic is filled in which the mold is rotated in a multi-axis manner at a suitable temperature, in which the plastic gets its desired properties and the hollow body is taken from the form.
Die bisher im Rotationsguß zum Einsatz kommenden Suspensionen sind ausschließlich PVC-Plastisole. Verwendet werden zur Zeit je nach gewünschtem Härtegrad des Hohlkörpers Plastisole mit einem Weichmachergehalt von bis zu über 50%. Das Kernproblem bei der Verwendung der typischen PVC-Weichmacher ist immer die unvermeidliche Migration des Weichmachers über die Zeit und sogar noch verstärkt bei erhöhten Temperaturen. Anwendung finden solche Hohlkörper in den verschiedensten Bereichen, wie z. B. in der Technik als Faltenbälge etc., im Freizeit- oder Sportbereich als Bälle etc., im Consumerbereich als Gartenzwerge oder Figuren allgemein etc., im Hygienebereich und im Spielwarenbereich als Puppen oder Puppenteile. In den beiden letztgenannten Bereichen liegt die Problematik darin, dass die Hohlkörper in engen Kontakt mit dem menschlichen Körper bzw. mit Körperflüssigkeiten kommen. Ist hier Weichmacher an die Oberfläche migriert, wird er vom menschlichen Körper aufgenommen. Um dieser Gesundheitsgefährdung zu begegnen, wurde bereits von der EU ein Verbot beim Einsatz von Kinderspielzeug für Kinder unter drei Jahren ausgesprochen. Weitere Einschränkungen werden diskutiert. Ein werterer Nachteil dieses Verfahrens ist der ungeheure Energieverbrauch der Öfen. Zum Gelieren des PVC müssen sowohl die Formen als auch das Plastisol in den Öfen auf Temperaturen um 200°C und darüber erwärmt werden. Nach jedem Durchlauf werden die Formen zur Entnahme der Hohlkörper abgekühlt und müssen dann wieder erwärmt werden.The suspensions previously used in rotary casting are exclusive PVC plastisols. Are currently used depending on the desired degree of hardness Hollow body plastisols with a plasticizer content of up to over 50%. The The core problem when using the typical PVC plasticizers is always that inevitable migration of plasticizer over time and even more so elevated temperatures. Such hollow bodies are used in a wide variety of applications Areas such as B. in technology as bellows, etc., in the leisure or sports area as Balls etc., in the consumer sector as garden gnomes or figures in general etc., in Hygiene area and in the toy area as dolls or doll parts. In both the latter areas, the problem is that the hollow body in tight Come into contact with the human body or with body fluids. Is here Plasticizer migrates to the surface, it is released by the human body added. In order to counter this health hazard, the EU bans the use of children's toys for children under the age of three pronounced. Other restrictions are discussed. A further disadvantage of this method is the enormous energy consumption of the furnaces. In order to gel the PVC, both the molds and the plastisol in the ovens must be opened Temperatures around 200 ° C and above are heated. After each run, the Molds for removing the hollow body are cooled and then have to be reheated become.
Der Erfindung liegt deshalb die Aufgabe zugrunde, ein Herstellverfahren mit einem Kunststoff zur Verfügung zu stellen, der gesundheitlich unbedenklich ist und der dem PVC vergleichbare, sehr universell einstellbare Eigenschaften aufweist.The invention is therefore based on the object of a manufacturing method with a To provide plastic that is harmless to health and that of PVC has comparable, very universally adjustable properties.
Die Lösung der Aufgabe ist dadurch gekennzeichnet,
dass die Form mit Polyurethan-Vorprodukten befüllt wird,
dass weitere Additive zugesetzt werden und
dass während der Rotation aus den Vorprodukten das gewünschte Polyurethan entsteht.
The solution to the problem is characterized by
that the mold is filled with polyurethane primary products,
that further additives are added and
that the desired polyurethane is formed from the preliminary products during the rotation.
Vorteilhaft ist es, wenn die Vorprodukte zu einem thermoplastischen Polyurethan reagieren.It is advantageous if the precursors become a thermoplastic polyurethane react.
Ebenso vorteilhaft ist es, wenn die Vorprodukte zu einem elastomeren Polyurethan reagieren.It is also advantageous if the preliminary products form an elastomeric polyurethane react.
Weitere vorteilhafte Ausgestaltungen der Erfindung sind den weiteren Unteransprüchen zu entnehmen.Further advantageous embodiments of the invention are set forth in the further subclaims remove.
Der entscheidende und bisher nicht erreichte Vorteil ist, dass die erfindungsgemäßen Suspensionen gesundheitlich unbedenklich sind und sich im wesentlichen mit unveränderter Verfahrens- und Anlagentechnik verarbeiten lassen.The decisive advantage that has not been achieved so far is that the inventive Suspensions are harmless to health and essentially with have unchanged process and plant technology processed.
Ein großer Vorteil liegt darin, dass die Reaktion der Vorprodukte zum Polyurethan exotherm ist, d. h. es wird keine Wärmeenergie benötigt. Dies macht das Verfahren im Vergleich zu dem herkömmlichen Verfahren höchst umwelt- und ressourcenschonend.A big advantage is that the reaction of the precursors to the polyurethane is exothermic, d. H. no thermal energy is required. This makes the procedure in Compared to the conventional process, extremely environmentally and resource-friendly.
Die Form wird mit einer geeigneten Menge an Vorprodukten zur Herstellung eines thermoplastischen Polyurethans zum Teil befüllt. Die Reaktion zur Bildung des Polyurethans beginnt nach einer kurzen Topfzeit zu laufen. Während der Reaktionszeit wird die Form mehrachsig bei Raumtemperatur rotiert. Nach dem Ende der Reaktion wird die Form ggf. abgekühlt und der Hohlkörper der Form entnommen. Die Form kann sofort wieder mit Vorprodukten befüllt werden und der Zyklus beginnt erneut.The mold is used with a suitable amount of precursors to produce a thermoplastic polyurethane partially filled. The reaction to the formation of the Polyurethane starts to run after a short pot life. During the response time the mold is rotated in multiple axes at room temperature. After the reaction is over the mold may have cooled and the hollow body removed from the mold. The shape can immediately are filled with intermediate products again and the cycle starts again.
Claims (6)
dass die Form mit Polyurethan-Vorprodukten befüllt wird,
dass weitere Additive zugesetzt werden und
dass während der Rotation aus den Vorprodukten das gewünschte Polyurethan entsteht.1. A process for the production of hollow bodies made of plastic in a rotational molding process, in which a metal mold is filled with a suitable amount of plastic, in which the mold is rotated in multiple axes at a suitable temperature, in which the plastic obtains its desired properties and in which the hollow body is removed from the mold, characterized in that
that the mold is filled with polyurethane primary products,
that further additives are added and
that the desired polyurethane is formed from the preliminary products during the rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2000149757 DE10049757A1 (en) | 2000-10-09 | 2000-10-09 | Rotational casting of hollow plastic moldings, involves molding and reacting of polyurethane pre-products and additives |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2000149757 DE10049757A1 (en) | 2000-10-09 | 2000-10-09 | Rotational casting of hollow plastic moldings, involves molding and reacting of polyurethane pre-products and additives |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE10049757A1 true DE10049757A1 (en) | 2002-04-11 |
Family
ID=7659029
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE2000149757 Withdrawn DE10049757A1 (en) | 2000-10-09 | 2000-10-09 | Rotational casting of hollow plastic moldings, involves molding and reacting of polyurethane pre-products and additives |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE10049757A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1401935A2 (en) * | 2001-04-30 | 2004-03-31 | Fusion Specialties, Inc. | Molded display forms |
| WO2007144426A1 (en) * | 2006-06-16 | 2007-12-21 | Commissariat A L'energie Atomique | Method for manufacturing a sealing bladder made of thermosetting polymer for a tank containing a pressurized fluid, such as a composite tank, and a tank |
-
2000
- 2000-10-09 DE DE2000149757 patent/DE10049757A1/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1401935A2 (en) * | 2001-04-30 | 2004-03-31 | Fusion Specialties, Inc. | Molded display forms |
| EP1401935A4 (en) * | 2001-04-30 | 2006-05-24 | Fusion Specialties Inc | Molded display forms |
| WO2007144426A1 (en) * | 2006-06-16 | 2007-12-21 | Commissariat A L'energie Atomique | Method for manufacturing a sealing bladder made of thermosetting polymer for a tank containing a pressurized fluid, such as a composite tank, and a tank |
| FR2902364A1 (en) * | 2006-06-16 | 2007-12-21 | Commissariat Energie Atomique | METHOD FOR MANUFACTURING A THERMOSETTING POLYMER SEALANT FOR A RESERVOIR CONTAINING A PRESSURIZED FLUID, SUCH AS A COMPOSITE TANK, AND TANK |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 8127 | New person/name/address of the applicant |
Owner name: ZAPF CREATION AG, 96472 ROEDENTAL, DE |
|
| 8181 | Inventor (new situation) |
Free format text: BARICH, GERHARD, PROF., 85258 WEICHS, DE |
|
| 8110 | Request for examination paragraph 44 | ||
| 8139 | Disposal/non-payment of the annual fee | ||
| 8170 | Reinstatement of the former position | ||
| 8130 | Withdrawal |