DE1571136A1 - Process for surface coating with polyurethane in the spray process - Google Patents

Process for surface coating with polyurethane in the spray process

Info

Publication number
DE1571136A1
DE1571136A1 DE19641571136 DE1571136A DE1571136A1 DE 1571136 A1 DE1571136 A1 DE 1571136A1 DE 19641571136 DE19641571136 DE 19641571136 DE 1571136 A DE1571136 A DE 1571136A DE 1571136 A1 DE1571136 A1 DE 1571136A1
Authority
DE
Germany
Prior art keywords
surface coating
diisocyanate
polyurethane
diisocyanates
spray
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
DE19641571136
Other languages
German (de)
Inventor
Dr Gottfried Reuter
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.)
ELASTOMER AG
Original Assignee
ELASTOMER 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 ELASTOMER AG filed Critical ELASTOMER AG
Publication of DE1571136A1 publication Critical patent/DE1571136A1/en
Pending legal-status Critical Current

Links

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
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/78—Nitrogen
    • 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
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6607—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Polyurethanes Or Polyureas (AREA)

Description

B e s c h r e i b u n g "Verfahren zur Oberflächenbeschichtung mit Polyurethanen m Sprühverfahren" Es ist bekannt, dass man Oberflächenbeschichtungen mit Polyurethanen mit Hilfe des lösungsmittelfreien Verfahrens da-; durch ausführt, dass man ein Gemisch aus einem Polyol (Polyester oder Polyäther) und einem primären Diol mit einem Diisocyanat oder einer Mischung von Isocyanaten und/oder Polyisocyanaten in Anwesenheit von Katalysatoren schnell mischt, zur Reaktitan bringt und das entstehende Polyurethan durch Sprühen auf die zu beschichtende Oberfläche aufbringt.B e s c h r e i b u n g "Process for surface coating with Polyurethanes by spraying "It is known that surface coatings are made with polyurethanes using the solvent-free process; through executes, that one is a mixture of a polyol (polyester or polyether) and a primary Diol with a diisocyanate or a mixture of isocyanates and / or polyisocyanates mixes quickly in the presence of catalysts, brings to reactitan and the resulting Applying polyurethane to the surface to be coated by spraying.

Die Förderung und die Dosierung der zu mischenden Komponenten erfolgt mit Hilfe von Dosierpumpen. Da die eingesetzten konventionellen aromatischen Diisocyanate bei normaler Raumtemperatur test sind, ist es notwendig, diese Produkte zu schmel zen und in geschmolzenem Zustand zu fördern und zu dosieren. The components to be mixed are conveyed and metered with the help of metering pumps. As the conventional aromatic diisocyanates used are test at normal room temperature, it is necessary to melt these products zen and to convey and dose in the molten state.

Dadurch ist man gezwungen, in der Sprühanlage den Vorratskessel für Diisocyanate, die Leitungen vom Kessel zu den Dosierpumpen, die Dosierpumpe selbst, die Leitungen von der Dosierpumpe zum Sprühkopf und den Sprühkopf zu beheizen Diese Heizeinrichtung macht die Anlage kompliziert und schwer, Eigenschaften, die besonders bei transportablen Anlagen störend sind Ausserdem geschieht es, dass trotz Reizung bei kaltem Wetter, besonders in den dünnen Rohrleitungen, das Material fest w5rd, und dadurch die Sprühanlage nicht mehr funktionsfähig bleibt. Schliesslich sind Diisocyanate empfindliche chemische Produkte, die unter anhaltenden höheren Temperaturen chemischen Veränderungen unterliegen, die die Eigenschaften der erzeugten Spr@hpolyurethane nachteilig beeinflussen.As a result, you are forced to use the storage tank for in the spray system Diisocyanates, the lines from the boiler to the metering pumps, the metering pump itself, to heat the lines from the dosing pump to the spray head and the spray head Heating device makes the system complicated and heavy, properties that are special are also disruptive in transportable systems it happens that despite irritation in cold weather, especially in the thin pipelines, that Material is solid, and the spray system no longer remains functional. After all, diisocyanates are sensitive chemical products that are persistent under higher temperatures are subject to chemical changes that affect the properties adversely affect the spray polyurethane produced.

Die oben erwähnten Nachteile werden erfindungsgemäss dadurch behoben, dass anstelle Diisocyanaten, Polyisocyanaten oder Gemischen derselben Diisocyanate eingesetzt werden, die mit einem Mono-Carbodiimid modifiziert worden sind. Die Modifikation von Diisocyanaten mit aliphatischen, cycloaliphatischen und aromatischen Carbodiimiden ergibt Produkte, die einen viel tieferen Schmelzpunkt besitzen als das ursprünglich eingesetzte Diisocyanat Der Verfestigungspunkt des modifizierten Diisocyanats lässt sich durch den Anteil Carbodiimid innerhalb gewisser Grenzen steuern. The above-mentioned disadvantages are eliminated according to the invention by that instead of diisocyanates, polyisocyanates or mixtures of the same diisocyanates be used which have been modified with a mono-carbodiimide. The modification of diisocyanates with aliphatic, cycloaliphatic and aromatic carbodiimides results in products that have a much lower melting point than the original Diisocyanate used The solidification point of the modified diisocyanate leaves can be controlled by the proportion of carbodiimide within certain limits.

In der Praxis hat sich eie Konzentration zwischen 2 und 20 Gew.-Carbodiimid bewährt, wobei vorzugsweise 5-12 ffi verwendet werden sollten. Ausserdem kann man durch Auswahl geeigne-ter Substituenten am ern aromatischer Diimide den Verflüssigungseffekt steuern, wobei sich als Kernsubstituenten besonders die Gruppen bewahrt haben.In practice, a concentration between 2 and 20% by weight of carbodiimide has proven useful, with 5-12 ffi preferably being used. In addition, the liquefaction effect can be controlled by selecting suitable substituents on the aromatic diimides, the groups in particular being the core substituents have preserved.

Beispiel: 900 ; festes 4,4'-Diphenylmet t@@@-Diisocyanat werden in einen Dreihalskolben Li Rührer, Thermome@@r und Rückflusskühler eingefüllt, Durch Heizen wird das Diisocyanat bei ca 40°C zum Schmelzen gebracht Anschliessend werden 100 g 2,5 - 2',5@ tetra-isopropyl-diphenylcarbodiimid zugegeben. Das Gemisch wird auf 25000 aufgeheizt, die Heizung dann abgestellt. Die Temperatur steigt von selbst bis auf 270°C an. In dieser Augenblick wird das Produkt in ein gekühltes Gefäss geleitet. -Das entstehende modifizierte Diisocyanat bleibt nach 14 Tagen Lagerung bei + 5°C flüssig, ohne dass nennenswerts Abscheidungen auftraten, Kurzfristige Kühlung bis auf - lO00erhöhte die Zähigkeit, ohne jedoch das Produkt fest werden zu lassen,Example: 900; solid 4,4'-Diphenylmet t @@@ - Diisocyanate are in a three-necked flask Li stirrer, Thermome @@ r and reflux condenser filled, By The diisocyanate is heated to melt at approx. 40 ° C 100 g of 2.5-2 ', 5 @ tetra-isopropyl-diphenylcarbodiimide were added. The mixture will heated to 25,000, the heating then turned off. The temperature rises by itself up to 270 ° C. At this point the product is placed in a chilled vessel directed. -The resulting modified diisocyanate remains after 14 days of storage Liquid at + 5 ° C without significant deposits, short-term Cooling down to -1000 increased the toughness without, however, the product becoming solid allow,

Claims (3)

Patentansprüche 1. Verfahren zum Oberflächenbeschichten mit Polyurethanen im lösungsmittelfreien Sprühverfahren, dadurch gekennzeichnet, dass ein Gemisch aus einem Polyester oder Polyäther (mit vorwiegend linearer Struktur), endständigen OH-Gruppen, sowie einem Molekulargewicht über 800 und einem Glycol (Molekulargewicht unter 500), mit Diisocyanaten, die mit einem Carbo-diimid modifiziert worden sind, schnell gemischt, zur Reaktion gebracht und versprüht wird. Claims 1. Process for surface coating with polyurethanes in the solvent-free spray process, characterized in that a mixture made of a polyester or polyether (with a predominantly linear structure), terminal OH groups, as well as a molecular weight over 800 and a glycol (molecular weight under 500), with diisocyanates that have been modified with a carbo-diimide, quickly mixed, reacted and sprayed. 2o Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Anteil Carbo-diimid 2 bis 20% des modifizierten Produktes beträgt. 2o method according to claim 1, characterized in that the proportion Carbo-diimide is 2 to 20% of the modified product. 3. Verfahren nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, dass als Diisocyanat das 4,4' 4'-Diphenylmethan-Diisocyanat verwendet wird. 3. The method according to claims 1 and 2, characterized in that that the 4,4'-4'-diphenylmethane diisocyanate is used as the diisocyanate. 40 Verfahren nach den Ansprtichen 1 bis 3, dadurch gekennzeichnet, dass als Carbo-diimid das 2,5 - 2',5' tetra-isopropyl-diphenylcarbodiimid verwendet wird. 40 Process according to Claims 1 to 3, characterized in that that 2,5-2 ', 5' tetra-isopropyl-diphenylcarbodiimide is used as the carbodiimide will.
DE19641571136 1964-07-09 1964-07-09 Process for surface coating with polyurethane in the spray process Pending DE1571136A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DER0038326 1964-07-09

Publications (1)

Publication Number Publication Date
DE1571136A1 true DE1571136A1 (en) 1970-08-13

Family

ID=7405481

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19641571136 Pending DE1571136A1 (en) 1964-07-09 1964-07-09 Process for surface coating with polyurethane in the spray process

Country Status (1)

Country Link
DE (1) DE1571136A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0005230A2 (en) * 1978-05-05 1979-11-14 Bayer Ag Binder for pulverulent coating materials
US4289813A (en) * 1973-02-01 1981-09-15 Bayer Aktiengesellschaft Process for coating solvent-free lacquers

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4289813A (en) * 1973-02-01 1981-09-15 Bayer Aktiengesellschaft Process for coating solvent-free lacquers
EP0005230A2 (en) * 1978-05-05 1979-11-14 Bayer Ag Binder for pulverulent coating materials
EP0005230A3 (en) * 1978-05-05 1979-11-28 Bayer Aktiengesellschaft Binder for pulverulent coating materials

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