DE1203459B - Process to improve the processability of low-pressure polyethylene - Google Patents
Process to improve the processability of low-pressure polyethyleneInfo
- Publication number
- DE1203459B DE1203459B DEE14724A DEE0014724A DE1203459B DE 1203459 B DE1203459 B DE 1203459B DE E14724 A DEE14724 A DE E14724A DE E0014724 A DEE0014724 A DE E0014724A DE 1203459 B DE1203459 B DE 1203459B
- Authority
- DE
- Germany
- Prior art keywords
- polyethylene
- low
- pressure polyethylene
- processability
- solvents
- 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
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- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F6/00—Post-polymerisation treatments
- C08F6/008—Treatment of solid polymer wetted by water or organic solvents, e.g. coagulum, filter cakes
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
- C08K5/0016—Plasticisers
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Description
Verfahren zur Verbesserung der Verarbeitbarkeit von Niederdruck-Polyäthylen Bekanntlich lassen sich Niederdruck-Polyäthylene mit höherem Molekulargewicht als Hochdruck-Polyäthylene herstellen. Die Verwendung von solchen Niederdruck-Polyäthylenen mit höherem Molekulargewicht führt zu Verarbeitungsschwierigkeiten.Process to improve the processability of low-pressure polyethylene It is known that low-pressure polyethylenes with a higher molecular weight than Manufacture high pressure polyethylene. The use of such low-pressure polyethylenes higher molecular weight leads to processing difficulties.
Der Schmelzindex solcher Stoffe liegt je nach Molekulargewicht zwischen 0,01 und 2,0 g/Min.; ein niedriger Schmelzindex besagt, daß sich Niederdruck-Polyäthylen-Pulver bei der Warmverformung nur sehr schwer oder gar nicht verarbeiten läßt, da ja der Schmelzbereich des Niederdruck-Polyäthylens an sich wesentlich höher liegt als der des Hochdruck-Polyäthylens. The melt index of such substances is between, depending on their molecular weight 0.01 and 2.0 g / min .; a low melt index means that it is low pressure polyethylene powder can only be processed with great difficulty or not at all during hot forming, since the The melting range of low-pressure polyethylene is much higher than that of high pressure polyethylene.
Bei hohen Verarbeitungstemperaturen ist aber die Gefahr einer Zersetzung erheblich. At high processing temperatures, however, there is a risk of decomposition considerable.
Es ist aus der britischen Patentschrift 735 162 bekannt, Polyäthylen-Teilchen (Molekulargewicht z. B. It is known from British Patent 735 162, polyethylene particles (Molecular weight e.g.
19000) mit Xylol zu überdecken und das Gemisch einen Tag bei etwa 200 C stehen zu lassen und die überschüssige Flüssigkeit abzugießen. Die leicht gequollenen Partikeln, deren Gewicht um 30°/o zugenommen hat, werden dann verpreßt. Hier handelt es sich um Einverleibung sehr großer Mengen Quellungsmittel, so daß beim Verpressen Produkte entstehen, die noch sehr große Mengen an Quellungsmittel enthalten und trotz des Trocknens bei 400 C nicht von Lösungsmitteln frei sind. Bei Übertragung des für Hochdruck-Polyäthylen bekannten Verfahrens auf Niederdruck-Polyäthylen ergaben sich, insbesondere hinsichtlich der Schrumpfung, unbrauchbare Produkte.19000) to cover with xylene and the mixture for a day at about Let stand 200 C and pour off the excess liquid. The easy swollen particles, the weight of which has increased by 30%, are then compressed. This is about the incorporation of very large amounts of swelling agent, so that When pressing, products are created that still contain very large amounts of swelling agent and are not free of solvents despite drying at 400 ° C. When transferring the process known for high-pressure polyethylene to low-pressure polyethylene The result was unusable products, particularly with regard to shrinkage.
Es ist weiterhin bekannt, die Verarbeitbarkeit von Olefinpolymeren durch Zusetzen von bestimmten anderen Stoffen, z. B. Butadienpolymeren oder Chlorbutadienpolymeren, zu verändern. Dabei verbleibt der Zusatzstoff in dem Endprodukt und verändert dessen Eigenschaften. Ein Teil dieser Zusatzstoffe ist auch für Polyäthylen, insbesondere Niederdruck-Polyäthylen, wegen Unverträglichkeit unbrauchbar. The processability of olefin polymers is also known by adding certain other substances, e.g. B. butadiene polymers or chlorobutadiene polymers, to change. The additive remains in the end product and changes it Properties. Some of these additives are also applicable to polyethylene, in particular Low-pressure polyethylene, unusable due to incompatibility.
Demgegenüber betrifft die Erfindung ein Verfahren zur Verbesserung der Verarbeitbarkeit von Polyäthylen durch Zusatz von für Polyäthylen ein Löse-oder Quellvermögen aufweisenden Lösungsmitteln, gemäß dem Niederdruck-Polyäthylen und weniger als 10 Gewichtsprozent solcher Lösungsmittel verwendet werden, die die Schmelzviskosität herabsetzen und bei der Verarbeitungstemperatur des Polyäthylens wieder verdampfen, so daß der Charakter des Materials nicht verändert wird. In contrast, the invention relates to a method for improvement the processability of polyethylene by adding a solvent or solvent for polyethylene Solvents exhibiting swelling properties, according to the low-pressure polyethylene and less than 10 percent by weight of such solvents are used which affect the melt viscosity reduce and evaporate again at the processing temperature of the polyethylene, so that the character of the material is not changed.
Als verdampfende, das Polyäthylen anlösende organische Lösungsmittel sind sämtliche für Nieder- druck-Polyäthylen bekannten Lösungsmittel geeignet. As an evaporating organic solvent that dissolves the polyethylene are all for low pressure polyethylene known solvent suitable.
Mit Vorteil werden Dekahydronaphthalin, Cyklohexanol und/oder Chlorbenzole verwendet.Decahydronaphthalene, cyclohexanol and / or chlorobenzenes are advantageous used.
Es wird dadurch der Vorteil erzielt, daß einerseits die Verarbeitbarkeit des an sich nicht sehr leicht verarbeitbaren Niederdruck-Polyäthylens verbessert wird und daß andererseits in dem Endprodukt die Eigenschaften des Ausgangsproduktes vorliegen. This has the advantage that, on the one hand, the processability of the low-pressure polyethylene, which is not very easy to process, is improved and that on the other hand in the end product the properties of the starting product are present.
Beispiel Ein Niederdruck-Polyäthylen mit einem Molekulargewicht von 160000 wird auf einem Walzwerk bei 2000 C homogenisiert und anschließend zu einer Platte verpreßt. Nach etwa 8 Minuten Walzzeit ist das Material homogen durchgeschmolzen. Example A low pressure polyethylene with a molecular weight of 160000 is homogenized on a rolling mill at 2000 C and then into one Plate pressed. After about 8 minutes of rolling, the material has melted homogeneously.
Setzt man demselben Grundmaterial 1 bis 2 0/o Cyclohexanol zu, so schmilzt das Material wesentlich leichter, haftet sehr stark auf den Walzen und ist bereits nach 3 Minuten völlig homogen aufgeschmolzen. If 1 to 2 0 / o cyclohexanol is added to the same base material, so the material melts much more easily, adheres very strongly to the rollers and melted completely homogeneously after just 3 minutes.
Die verpreßte Platte zeigt außerdem eine höhere Transparenz als die des ursprünglichen Materials.The pressed board also shows a higher transparency than that of the original material.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEE14724A DE1203459B (en) | 1957-09-27 | 1957-09-27 | Process to improve the processability of low-pressure polyethylene |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEE14724A DE1203459B (en) | 1957-09-27 | 1957-09-27 | Process to improve the processability of low-pressure polyethylene |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1203459B true DE1203459B (en) | 1965-10-21 |
Family
ID=7068875
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEE14724A Pending DE1203459B (en) | 1957-09-27 | 1957-09-27 | Process to improve the processability of low-pressure polyethylene |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1203459B (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT159180B (en) * | 1936-02-04 | 1940-07-25 | Ici Ltd | Application of a product obtained in a process for the polymerization of ethylene. |
US2303069A (en) * | 1933-07-08 | 1942-11-24 | Jasco Inc | Composition containing iso-olefin polymers |
GB735162A (en) * | 1952-09-30 | 1955-08-17 | Degussa | Process for the production of shaped bodies of polyethylene |
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1957
- 1957-09-27 DE DEE14724A patent/DE1203459B/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2303069A (en) * | 1933-07-08 | 1942-11-24 | Jasco Inc | Composition containing iso-olefin polymers |
AT159180B (en) * | 1936-02-04 | 1940-07-25 | Ici Ltd | Application of a product obtained in a process for the polymerization of ethylene. |
GB735162A (en) * | 1952-09-30 | 1955-08-17 | Degussa | Process for the production of shaped bodies of polyethylene |
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