WO1998031737A1 - Uhf-vernetzung von polyethylen - Google Patents
Uhf-vernetzung von polyethylen Download PDFInfo
- Publication number
- WO1998031737A1 WO1998031737A1 PCT/EP1998/000319 EP9800319W WO9831737A1 WO 1998031737 A1 WO1998031737 A1 WO 1998031737A1 EP 9800319 W EP9800319 W EP 9800319W WO 9831737 A1 WO9831737 A1 WO 9831737A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- polyethylene
- crosslinking
- butyl perbenzoate
- methylstyrene dimer
- agent according
- 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.)
- Ceased
Links
Classifications
-
- 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
- C08K5/01—Hydrocarbons
-
- 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
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
Definitions
- the invention relates to an agent for producing crosslinked polyethylene, a method for producing crosslinked polyethylene and the use of the agent for producing crosslinked polyethylene.
- Objects molded from polyethylene are used in many areas.
- the increase in the use of polyethylene is due to its good material properties as well as its easy disposal options. 5
- Methods for making articles molded from polyethylene generally include an extrusion step for extrusion followed by molding of the desired articles.
- Scorching also occurs in the shaping device when producing shaped objects from cross-linked polyethylene, which leads to irregular and non-uniformly shaped objects.
- a number of methods are known to prevent scorching in the molding process.
- Japanese Patent Publication SHO 54 (1979) -8500 relates to a method for preventing scorch by adding a selected phenyl compound, such as ⁇ -methylstyrene, or an acrylic ester.
- US Pat. No. 3,335,124 describes a process in which scorch is to be prevented by adding a sulfur compound.
- U.S. Patent 3,202,648 mentions the addition of a nitrogen compound
- Japanese Patent Publication SH047 (1972) -36866 mentions the addition of a phenolic compound.
- these processes have the disadvantage that they reduce the degree of crosslinking of the products.
- European patent application 0 453 204 A1 describes crosslinking of polyethylene with dialkyl peroxide and 2,4-diphenyl-4-methyl-1-pentene when heated, with a simultaneous delay in Scorch.
- an agent for producing molded, crosslinked polyethylene comprising a peroxide and a crosslinking retarder, which is characterized in that the peroxide is t-butyl perbenzoate and the crosslinking retarder is ⁇ -methylstyrene dimer.
- the agent according to the invention leads to a crosslinked polyethylene which has a high degree of crosslinking 5 and in which there is no premature crosslinking. It was found that the polyethylene produced with the agent according to the invention essentially Chen has the same degree of crosslinking as polyethylene, which was produced from a mixture of polyethylene and t-butyl perbenzoate. The agent according to the invention is of great advantage since it greatly reduces the amount of rejects, which represents a considerable technical advantage.
- the ratio of the two components of the inventive agent t-butyl perbenzoate and c-methylstyrene dimer can be varied depending on the requirements; the ratio of t-butyl perbenzoate to ⁇ t-methylstyrene dimer is preferably at least 20: 1 to 1: 1, particularly preferably from 10: 1 to 1: 1 and most preferably from 5: 1 to 2: 1.5
- Another object of the present invention is a process for the production of crosslinked polyethylene, which is characterized in that polyethylene, t-butyl perbenzoate, of-methylstyrene dimer and optionally additives are mixed, the mixture is extruded and then at an elevated temperature is networked.
- the polyethylene component used in the process according to the invention can be polyethylene, ethylene / vinyl acetate copolymer, ethylene / propylene copolymer, ethylene / butene copolymer, ethylene / pentene copolymer, ethylene / propylene / diene copolymer, ethylene / ethyl acrylate copolymer, ethylene / glycidyl methacrylate copolymer. mer, ethylene / methyl methacrylate copolymer, ethylene / acrylonitrile copolymer, styrene / butadiene copolymer and halogenated polyethylenes.
- LDPE low density polyethylene
- HDPE high density polyethylene
- LDPE high density polyethylene
- additives such as, for example, antioxidants, pigments, UV stabilizers, fillers, plasticizers and other customary agents which are usually used in crosslinking reactions.
- t-butyl perbenzoate and ⁇ -methylstyrene dimer are used in an appropriate ratio, preferably t-butyl perbenzoate and ⁇ -methylstyrene dimer in a ratio of at least 20: 1 to 1: 1, particularly preferred in a ratio of 10: 1 to 1: 1 and most preferably from 5: 1 to 2: 1, t-butyl perbenzoate and ⁇ -methylstyrene dimer are used in an advantageous total proportion based on polyethylene, preferably t- Butyl perbenzoate and ⁇ -methylstyrene, used in a total proportion of 1 to 10%, preferably 2 to 6%, based on polyethylene.
- the extrusion is carried out in the process according to the invention at a temperature which is adapted to the other process conditions, preferably at a temperature of 20 ° C to 140 ° C, particularly preferably at a temperature of 70 ° C to 135 ° C and most preferably o at a temperature of 90 ° C to 125 ° C.
- the crosslinking is carried out according to the invention by increasing it to a suitable temperature, preferably at a temperature of 130 ° C. to 200 ° C., particularly preferably at a temperature of 150 ° C. to 190 ° C. and most preferably at a temperature from 160 ° C to 180 ° C.
- the temperature increase is brought about by a high-frequency alternating electrical field.
- the high-frequency alternating electric field is applied so long to achieve a desired crosslinking, the high-frequency alternating electric field is preferably used for a period of 10 seconds to 15 minutes, particularly preferably for 30 seconds to 10 minutes and most preferably for 1 to Leave on for 5 minutes. 0
- Another object of the invention is the use of the agent according to the invention for the production of crosslinked polyethylene.
- the ratio of t-butyl perbenzoate to ⁇ -methylstyrene dimer, total amount of t-butyl perbenzoate and ⁇ -methylstyrene dimer used based on polyethylene, extrusion temperature, crosslinking temperature, application of a high-frequency electrical or alternating field and duration apply the application of the alternating electrical field as described above.
- Fig. 5b shows a rheometer measurement at 180 ° C of 4% TBPB o compared to a 5% VP-170 composition
- the powdered PE type Lupolen 1800 spl5 was used; o because with its good absorbency, it enables particularly simple and quick mixing and distribution of the peroxide or the peroxide / inhibitor mixture without any mechanical effort
- Tables I and II list all measurements to show the 5 coagent / inhibitor effect. The corresponding values are shown graphically in FIGS. 1 to 4.
- the mixture was produced by diffusing the TBPB or the VP-170 mixture in the glass flask at about 40 ° C. for 8 hours.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP98907970A EP0954548A1 (de) | 1997-01-21 | 1998-01-21 | Uhf-vernetzung von polyethylen |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19701915.3 | 1997-01-21 | ||
| DE1997101915 DE19701915A1 (de) | 1997-01-21 | 1997-01-21 | UHF-Vernetzung von Polyethylen |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1998031737A1 true WO1998031737A1 (de) | 1998-07-23 |
| WO1998031737A9 WO1998031737A9 (de) | 1998-11-12 |
Family
ID=7817892
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP1998/000319 Ceased WO1998031737A1 (de) | 1997-01-21 | 1998-01-21 | Uhf-vernetzung von polyethylen |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0954548A1 (de) |
| DE (1) | DE19701915A1 (de) |
| WO (1) | WO1998031737A1 (de) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3339499A1 (de) * | 1982-11-01 | 1984-05-03 | Nippon Oil and Fats Co., Ltd., Tokyo | Verfahren zur aushaertung eines ungesaettigten polyesterharzes |
| EP0453204A1 (de) * | 1990-04-16 | 1991-10-23 | Nippon Oil And Fats Company, Limited | Zusammensetzung zur Vernetzung von Äthylenpolymeren, Verfahren zur Vernetzung von Äthylenpolymeren und vernetzbare Zusammensetzung |
-
1997
- 1997-01-21 DE DE1997101915 patent/DE19701915A1/de not_active Withdrawn
-
1998
- 1998-01-21 WO PCT/EP1998/000319 patent/WO1998031737A1/de not_active Ceased
- 1998-01-21 EP EP98907970A patent/EP0954548A1/de not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3339499A1 (de) * | 1982-11-01 | 1984-05-03 | Nippon Oil and Fats Co., Ltd., Tokyo | Verfahren zur aushaertung eines ungesaettigten polyesterharzes |
| EP0453204A1 (de) * | 1990-04-16 | 1991-10-23 | Nippon Oil And Fats Company, Limited | Zusammensetzung zur Vernetzung von Äthylenpolymeren, Verfahren zur Vernetzung von Äthylenpolymeren und vernetzbare Zusammensetzung |
Non-Patent Citations (1)
| Title |
|---|
| SUYAMA S ET AL: "CROSSLINKING OF POLYETHYLENE BY DICUMYL PEROXIDE IN THE PRESENCE OF2,4-DIPHENYL-4-METHYL-1-PENTENE", POLYMER JOURNAL, vol. 27, no. 4, 15 April 1995 (1995-04-15), pages 371 - 375, XP000507559 * |
Also Published As
| Publication number | Publication date |
|---|---|
| DE19701915A1 (de) | 1998-07-23 |
| EP0954548A1 (de) | 1999-11-10 |
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