AT210630B - Process for the production of porous plastics from polypropylene - Google Patents
Process for the production of porous plastics from polypropyleneInfo
- Publication number
- AT210630B AT210630B AT336258A AT336258A AT210630B AT 210630 B AT210630 B AT 210630B AT 336258 A AT336258 A AT 336258A AT 336258 A AT336258 A AT 336258A AT 210630 B AT210630 B AT 210630B
- Authority
- AT
- Austria
- Prior art keywords
- polypropylene
- production
- extraction
- hydrocarbons
- porous plastics
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 9
- -1 polypropylene Polymers 0.000 title description 11
- 239000004743 Polypropylene Substances 0.000 title description 10
- 229920001155 polypropylene Polymers 0.000 title description 10
- 238000004519 manufacturing process Methods 0.000 title description 5
- 239000004033 plastic Substances 0.000 title description 3
- 229920003023 plastic Polymers 0.000 title description 3
- 238000000605 extraction Methods 0.000 claims description 12
- 229930195733 hydrocarbon Natural products 0.000 claims description 10
- 150000002430 hydrocarbons Chemical class 0.000 claims description 10
- 125000001931 aliphatic group Chemical group 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 238000009835 boiling Methods 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 230000007717 exclusion Effects 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims 1
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N octane Chemical compound CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000379 polymerizing effect Effects 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 229930195734 saturated hydrocarbon Natural products 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 229930195735 unsaturated hydrocarbon Natural products 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/24—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by surface fusion and bonding of particles to form voids, e.g. sintering
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Powder Metallurgy (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Description
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Verfahren zur Herstellung von porösen Kunststoffen aus Polypropylen
Im Patent Nr. 200799 wurde ein Verfahren beschrieben zur Herstellung von porösen Formkörpern aus Polypropylen. Dieses Material wurde vor seiner Verarbeitung zur Entfernung der niedrigmolekularen Anteile einer Extraktion unterworfen, u. zw. zunächst mit sauerstoffhaltigen organischen Verbindungen, wie Äther und Aceton, und anschliessend mit Kohlenwasserstoffen, besonders Heptan oder Oktan.
Es wurde gefunden, dass man zur Herstellung von porösen Formkörpern aus Polypropylen durch Sintern bei erhöhter Temperatur und vorzugsweise erhöhtem Druck so verfährt, dass man das zu verarbeitende Polypropylen vor dem Sintern ausschliesslich einer Extraktion mit Kohlenwasserstoffen unterwirft. Verwendet man für diese Extraktion Kohlenwasserstoffe, die zwischen 30 und 2000 sieden, vorzugsweise solche, die zwischen 75 und 160 sieden, so gelingt es, ein Ergebnis zu erzielen, das dem gemäss Stammpatent nicht nachsteht. Man erspart jedoch bei dieser Vereinfachung die Verwendung kostspieliger Extraktionsmittel, wie Aceton, Äther oder Alkohol, vermag den erforderlichen Aufwand an technischen Anlagen und Investitionen beträchtlich zu verringern und erzielt darüber hinaus eine wesentliche Beschleunigung im Gang der Aufarbeitung des Materials.
Erfindungsgemäss wird so gearbeitet, dass das zur Verwendung kommende Polymerisat, insbesondere Polypropylen, mit einem beträchtlichen Überschuss an Kohlenwasserstoffen, beispielsweise Hexan, Heptan oder Oktan, behandelt wird. Diese Behandlung kann schon in der Kälte vorgenommen werden. Jedoch sind in solchen Fällen grosse Mengen Lösungsmittel erforderlich, um einen ausreichenden Extraktionseffekt zu erzielen. Beispielsweise muss man, wenn die Extraktmenge um etwa 10%, bezogen auf das Rohpolymerisat, liegt, mit einer Menge von etwa 11 Extraktionsflüssigkeit pro 10-20 g Rohpolymerisat rechnen.
Zweckmässiger ist eine Behandlung bei erhöhten Temperaturen, besonders vorteilhaft beim Siedepunkt des jeweils zur Anwendung kommenden Kohlenwasserstoffs bzw. der Kohlenwasserstoffgemische. Unter Umständen können auch andere Kohlenwasserstoffe, z. B. Naphthene oder Aromaten, gegebenenfalls in Mischung mit Aliphaten, verwendet werden. Jedoch haben sich gerade aliphatische, gesättigte Kohlenwasserstoffe, die gegebenenfalls einen gewissen Anteil an ungesättigten Kohlenwasserstoffen enthalten können, besonders bewährt.
Es ist zweckmässig, die Extraktion unter Ausschluss von Luft oder Sauerstoff in jeglicher Form durchzuführen, besonders dann, wenn man bei erhöhter Temperatur arbeitet. Hiedurch wird vermieden, dass eine mehr oder weniger starke Oxydation des Polymerisats und unter Umständen ein gewisser Abbau erfolgt. Vorteilhaft ist es weiterhin, während der Extraktion die gesamte Apparatur unter sauerstofffreiem Stickstoff zu halten und wenn möglich, die Behandlung im Dunkeln durchzuführen. Die Extraktion wird zweckmässig bei Normaldruck ausgeführt, die Anwendung eines schwachen Unterdrucks ist jedoch ebenso möglich wie die eines Überdrucks. Überdruck empfiehlt sich besonders dann, wenn zur Extraktion niedrigsiedende Kohlenwasserstoffe benutzt werden.
Beispiel : Unter Anwendung von kristallisiertem TiCl, welches durch Reduktion von Tical, in Gegenwart von Wasserstoff bei 6500 erhalten worden war. einerseits sowie Aluminiumtriäthyl anderseits (beide Komponenten im Molverhältnis 1 : 1) wurde bei einem Druck von 10 atü durch Polymerisation von Propylen ein Polypropylen mit einem Molekulargewicht von 150000 (viskosimetrisch gemessen) hergestellt.
<Desc/Clms Page number 2>
Dieses Produkt wurde in einer Menge von 15g mit einem Liter einer hydrierten C7-Fraktion aus der Fischer-Tropsch-Synthese während 6 Stunden bei Raumtemperatur gerührt. Nach Abfiltrieren des Lösungmittels hinterblieben 14, 2g Polypropylen. Dieses Material wurde für die erfindungsgemässe Arbeitsweise verwendet.
PATENTANSPRÜCHE :
1. Verfahren zur Herstellung von porösen Kunststoffen aus Polypropylen durch Sintern bei erhöhter Temperatur und vorzugsweise erhöhtem Druck nach Stammpatent Nr. 200 799, dadurch gekennzeichnet, dass man das zu verarbeitende Polypropylen ausschliesslich einer Extraktion mit Kohlenwasserstoffen unterwirft.
<Desc / Clms Page number 1>
Process for the production of porous plastics from polypropylene
Patent No. 200799 describes a process for the production of porous molded articles from polypropylene. Before being processed, this material was subjected to extraction to remove the low-molecular-weight components, u. between first with oxygen-containing organic compounds, such as ether and acetone, and then with hydrocarbons, especially heptane or octane.
It has been found that for the production of porous moldings from polypropylene by sintering at elevated temperature and preferably elevated pressure, the polypropylene to be processed is subjected exclusively to an extraction with hydrocarbons before sintering. If hydrocarbons that boil between 30 and 2000 are used for this extraction, preferably those that boil between 75 and 160, it is possible to achieve a result that is not inferior to that according to the parent patent. However, this simplification saves the use of expensive extraction agents, such as acetone, ether or alcohol, is able to considerably reduce the outlay in terms of technical equipment and investments and, moreover, achieves a substantial acceleration in the work-up of the material.
According to the invention, the procedure is that the polymer used, in particular polypropylene, is treated with a considerable excess of hydrocarbons, for example hexane, heptane or octane. This treatment can be carried out in the cold. In such cases, however, large amounts of solvent are required in order to achieve a sufficient extraction effect. For example, if the amount of extract is around 10%, based on the raw polymer, then an amount of about 11 extraction liquid per 10-20 g of raw polymer must be expected.
Treatment at elevated temperatures is more expedient, particularly advantageously at the boiling point of the particular hydrocarbon or hydrocarbon mixture used. Other hydrocarbons, e.g. B. naphthenes or aromatics, optionally mixed with aliphatics, can be used. However, it is precisely aliphatic, saturated hydrocarbons, which may contain a certain proportion of unsaturated hydrocarbons, that have proven particularly useful.
It is advisable to carry out the extraction in any form with the exclusion of air or oxygen, especially when working at elevated temperature. This avoids a more or less strong oxidation of the polymer and, under certain circumstances, a certain degradation. It is also advantageous to keep the entire apparatus under oxygen-free nitrogen during the extraction and, if possible, to carry out the treatment in the dark. The extraction is expediently carried out at normal pressure, but the use of a slight negative pressure is just as possible as that of an overpressure. Overpressure is particularly recommended when low-boiling hydrocarbons are used for the extraction.
Example: Using crystallized TiCl, which had been obtained by reducing Tical in the presence of hydrogen at 6500. on the one hand and aluminum triethyl on the other hand (both components in a molar ratio of 1: 1) a polypropylene with a molecular weight of 150,000 (measured viscometrically) was produced at a pressure of 10 atmospheres by polymerizing propylene.
<Desc / Clms Page number 2>
This product was stirred in an amount of 15 g with one liter of a hydrogenated C7 fraction from the Fischer-Tropsch synthesis for 6 hours at room temperature. After filtering off the solvent, 14.2 g of polypropylene remained. This material was used for the procedure according to the invention.
PATENT CLAIMS:
1. Process for the production of porous plastics from polypropylene by sintering at elevated temperature and preferably elevated pressure according to parent patent no. 200 799, characterized in that the polypropylene to be processed is subjected exclusively to an extraction with hydrocarbons.
Claims (1)
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE562196D BE562196A (en) | 1956-11-08 | ||
| DER19969A DE1092649B (en) | 1956-11-08 | 1956-11-08 | Process for the production of porous molded articles from polypropylene |
| AT200799D AT200799B (en) | 1956-11-08 | 1957-10-07 | Process for the production of porous plastics from polypropylene |
| FR1185700D FR1185700A (en) | 1956-11-08 | 1957-11-04 | Process for preparing porous plastics from polypropylene |
| AT336258A AT210630B (en) | 1956-11-08 | 1958-05-09 | Process for the production of porous plastics from polypropylene |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE200799X | 1956-11-08 | ||
| DE1185700X | 1956-11-08 | ||
| DER19969A DE1092649B (en) | 1956-11-08 | 1956-11-08 | Process for the production of porous molded articles from polypropylene |
| AT336258A AT210630B (en) | 1956-11-08 | 1958-05-09 | Process for the production of porous plastics from polypropylene |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AT210630B true AT210630B (en) | 1960-08-10 |
Family
ID=63798673
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT200799D AT200799B (en) | 1956-11-08 | 1957-10-07 | Process for the production of porous plastics from polypropylene |
| AT336258A AT210630B (en) | 1956-11-08 | 1958-05-09 | Process for the production of porous plastics from polypropylene |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AT200799D AT200799B (en) | 1956-11-08 | 1957-10-07 | Process for the production of porous plastics from polypropylene |
Country Status (4)
| Country | Link |
|---|---|
| AT (2) | AT200799B (en) |
| BE (1) | BE562196A (en) |
| DE (1) | DE1092649B (en) |
| FR (1) | FR1185700A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1231430B (en) * | 1960-02-11 | 1966-12-29 | Ruhrchemie Ag | Process for the production of porous moldings by heating mixtures of polyolefin powders |
| DE1241599B (en) | 1961-02-01 | 1967-06-01 | Ruhrchemie Ag | Use of powdery high molecular weight polyethylene for the production of solid, porous bodies by sintering |
| WO2004035299A1 (en) * | 2002-10-16 | 2004-04-29 | Pfleiderer Water Systems Gmbh | Pre-filter material |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2256483A (en) * | 1939-06-21 | 1941-09-23 | Du Pont | Synthetic spongy material |
| GB573306A (en) * | 1941-07-03 | 1945-11-15 | Callenders Cable & Const Co | Improvements in the manufacture of cellular polymerised ethylene |
| GB626151A (en) * | 1947-02-27 | 1949-07-11 | Expanded Rubber Co Ltd | Improvements in or relating to the production of cellular polyethylene |
| US2532243A (en) * | 1949-07-09 | 1950-11-28 | Monsanto Chemicals | Polyethylene foams |
-
0
- BE BE562196D patent/BE562196A/fr unknown
-
1956
- 1956-11-08 DE DER19969A patent/DE1092649B/en active Pending
-
1957
- 1957-10-07 AT AT200799D patent/AT200799B/en active
- 1957-11-04 FR FR1185700D patent/FR1185700A/en not_active Expired
-
1958
- 1958-05-09 AT AT336258A patent/AT210630B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| DE1092649B (en) | 1960-11-10 |
| BE562196A (en) | 1900-01-01 |
| FR1185700A (en) | 1959-08-04 |
| AT200799B (en) | 1958-11-25 |
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