DE1051489B - Plastic powder mixture for whirl sintering - Google Patents
Plastic powder mixture for whirl sinteringInfo
- Publication number
- DE1051489B DE1051489B DEJ8177A DEJ0008177A DE1051489B DE 1051489 B DE1051489 B DE 1051489B DE J8177 A DEJ8177 A DE J8177A DE J0008177 A DEJ0008177 A DE J0008177A DE 1051489 B DE1051489 B DE 1051489B
- Authority
- DE
- Germany
- Prior art keywords
- powder mixture
- epoxy resin
- plastic powder
- plastic
- sintering
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
- C09D123/02—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D123/04—Homopolymers or copolymers of ethene
- C09D123/06—Polyethene
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
Description
Kunststoffpulvergemisch zum Wirbelsintern Unter Wirbelsintern versteht man ein Verfahren zur Herstellung von Schutzüberzügen aus thermoplastischen Kunststoffen durch Eintauchen der über den Schmelzpunkt des Kunststoffes erwärmten Gegenstände in aufgewirbeltes Kunststoffpulver. Das Aufwirbeln des Kunststoffpulvers während des Eintauchens des zu überziehenden Gegenstandes geschieht entweder in der beim Wirbelsinterverfahren bekannten Weise durch einen aufsteigenden, das Pulver durchdringenden Gasstrom gemäß Verfahren nach der deutschen Patentschrift 933 019, oder es wird durch einen oder mehrere elektrisch betriebene Schwingungserzeuger (vgl. die deutsche Auslegeschrift 1042 442) aufgewirbelt, d. h., daß es in einem flüssigkeitsähnlichen Schwebezustand aufgelockert wird.Plastic powder mixture for whirl sintering Whirl sintering is a process for the production of protective coatings from thermoplastics by immersing objects heated above the melting point of the plastic in whirled up plastic powder. The plastic powder is whirled up while the object to be coated is immersed either in the manner known from the fluidized bed sintering process by an ascending gas flow that penetrates the powder according to the process according to German patent specification 933 019, or it is generated by one or more electrically operated vibration generators (cf. German Auslegeschrift 1 042 442) whirled up, ie that it is loosened in a fluid-like state of suspension.
Als Kunststoffpulver für dieses Wirbelsintern wurde unter anderem bereits die alleinige Verwendung von Epoxyharzpulver oder von Polyäthylenpulver vorgeschlagen. Es ist zudem bekannt, daß dieses Auftragsverfahren auch die Verarbeitung von Pulvertnischungen anderer Harze erlaubt. Hierbei hat man bisher jedoch die sich ergebenden Vorteile bei der Verwendung von Kunststoffmischungen aus der Gruppe der härtbaren Harze nicht erkannt. Aber gerade solche Kunststoffmischungen verleihen den damit ausgeführten Überzügen leicht die gewünschten Eigenschaften, wie Härte, Festigkeit, Haftfähigkeit, Elastizität und Porendichte.As a plastic powder for this vortex sintering was among other things even the sole use of epoxy resin powder or polyethylene powder suggested. It is also known that this application method also includes processing of powder mixtures of other resins allowed. Here, however, you have so far resulting advantages when using plastic mixtures from the group of curable resins not recognized. But it is precisely such plastic mixtures that lend the desired properties, such as hardness, Strength, adhesiveness, elasticity and pore density.
Die Erfindung nutzt diese Erkenntnis durch die Kombination eines Epoxyharzes mit Polyäthylenpulver aus. Das Mischungsverhältnis kann dabei im Bereich von 20 bis 1:1 bzw. 1:1 bis 20 Gewichtsteilen variieren. Ein aus solchem Pulvergemisch mittels Wirbelsintern aufgetragener Überzug zeigt bei seiner Untersuchung einen eigenartigen Aufbau: das Polyäthylen bildet ein fädiges Gerüst, in dem das Epoxyharz eingelagert ist. Diese besondere Struktur beseitigt die Nachteile, die das im Endzustand harte und spröde Epoxyharz sonst besitzt, so daß nun auch dünne Überzugsschichten aus diesem Material haltbar aufgetragen werden können. So zeigen Versuche bezüglich der Biegefestigkeit, daß etwa 1 mm starke, auf Aluminiumblech mit dem bekannten Wirbelsinterverfahren als Überzug aufgetragene Schichten von Epoxyharz allein schon beim leichten Biegen des Bleches abspringt, während Überzüge aus einer Kunststoffpulvermischung von etwa 60 Gewichtsteilen Epoxyharz und 40 Teile Polyäthylen selbst Biegungen um einen Zylinder von etwa 150 mm Durchmesser vertragen. In beiden Versuchsfällen ist das mittels Wirbelsinterverfahren kunststoffüberzogene Aluminiumblech nach dem Beschichten noch etwa 40 Minuten einer Temperatur von etwa 200° C im Ofen zur Härtung des mit Vernetzungsmitteln versetzten Epoxyharzes unterworfen.The invention uses this knowledge by combining an epoxy resin with polyethylene powder. The mixing ratio can be in the range of 20 up to 1: 1 or 1: 1 to 20 parts by weight. One from such a powder mixture Coating applied by means of vortex sintering shows a peculiar structure: the polyethylene forms a thread structure in which the epoxy resin is stored. This particular structure eliminates the drawbacks that this will have in the final state hard and brittle epoxy resin otherwise possesses, so that now also thin coating layers made of this material can be applied in a durable manner. So experiments show regarding the bending strength, that about 1 mm thick, on aluminum sheet with the known Layers of epoxy resin applied as a coating in a fluidized-bed sintering process alone pops off when the sheet is bent slightly, while coatings are made from a mixture of plastic powders of about 60 parts by weight of epoxy resin and 40 parts of polyethylene itself bends around can tolerate a cylinder about 150 mm in diameter. In both test cases the plastic-coated aluminum sheet after coating using a fluidized bed process about 40 minutes at a temperature of about 200 ° C in the oven to harden the with Subjected to crosslinking agents mixed epoxy resin.
Die mit dem erfindungsgemäßen Pulvergemisch erhaltenen Überzüge sind glatt, sie neigen nicht zur Riss:ebildung. Die Prüfung der Schlagfestigkeit ergibt etwa um 30% erhöhte Werte gegenüber den auf gleiche Weise behandelten Überzügen aus Epoxyharz allein. Mittels Wirbelsinterverfahren aufgebrachte Kunststoffschichten aus Epoxyharz und Polyäthylen vereinigen somit, begründet durch ihren eigenartigen Aufbau aus Polyäthylengerüst mit eingelagertem Epoxyharz, die Eigenschaften der Biegefestigkeit mit guter Härte, Stoß- und Schlagfestigkeit.The coatings obtained with the powder mixture according to the invention are smooth, they do not tend to crack. The impact resistance test gives values increased by about 30% compared to the coatings treated in the same way made of epoxy resin alone. Plastic layers applied by means of a fluidized bed sintering process from epoxy resin and polyethylene thus unite, justified by their peculiarity Structure made of polyethylene frame with embedded epoxy resin, the properties of the Flexural strength with good hardness, shock and impact resistance.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEJ8177A DE1051489B (en) | 1954-01-18 | 1954-01-18 | Plastic powder mixture for whirl sintering |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEJ8177A DE1051489B (en) | 1954-01-18 | 1954-01-18 | Plastic powder mixture for whirl sintering |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1051489B true DE1051489B (en) | 1959-02-26 |
Family
ID=7198678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEJ8177A Pending DE1051489B (en) | 1954-01-18 | 1954-01-18 | Plastic powder mixture for whirl sintering |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1051489B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1137209B (en) * | 1960-08-19 | 1962-09-27 | Norddeutsche Kabelwerke Ag | Process for the production of molded parts by thermosetting molding compositions which contain resinous polyepoxides and polymeric organic compounds |
DE1290275B (en) * | 1963-10-12 | 1969-03-06 | Siemens Ag | Powdered, thermosetting coating agent |
DE1293368B (en) * | 1961-09-05 | 1969-04-24 | Dow Chemical Co | Powdery coating compounds based on mixtures of polyethylene and copolymers with ethylene and acrylic acid units |
-
1954
- 1954-01-18 DE DEJ8177A patent/DE1051489B/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1137209B (en) * | 1960-08-19 | 1962-09-27 | Norddeutsche Kabelwerke Ag | Process for the production of molded parts by thermosetting molding compositions which contain resinous polyepoxides and polymeric organic compounds |
DE1293368B (en) * | 1961-09-05 | 1969-04-24 | Dow Chemical Co | Powdery coating compounds based on mixtures of polyethylene and copolymers with ethylene and acrylic acid units |
DE1290275B (en) * | 1963-10-12 | 1969-03-06 | Siemens Ag | Powdered, thermosetting coating agent |
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