FIELD: polymer materials.
SUBSTANCE: invention provides multimodal polymer composition for manufacturing tubes, which contains 92-00% bimodal polyethylene and 1-8% carbon black and is characterized by melt flowing rate (MFR5) within a range of 0.15 to 0.40 g/10 min, measured according to ISO 1133, and density 955-965 kg/m3. Bimodal polyethylene comprises 42-55% low-molecular weight ethylene homopolymer characterized by melt flowing rate (MFR1.2) within a range of 350 to 1500 g/10 min and 58-45% high-molecular weight copolymer of ethylene with 1-hexene, 4-methyl-1-pentene, 1-octene and/or 1-decene. Tubes manufactured from above composition show design stress at 9.0 MPa and are characterized by good workability, high resistance to slow formation of cracks and fast propagation of cracks as well as high maximum permissible design stress.
EFFECT: improved performance characteristics of tubes.
23 cl, 2 tbl, 4 ex
| Title | Year | Author | Number |
|---|---|---|---|
| TUBE FOR HOT FLUID MEDIA | 2002 |
|
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| POLYETHYLENE COMPOSITION FOR PRESSURE PIPES WITH IMPROVED HOMOGENEITY | 2019 |
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| MOULDING COMPOSITION PREPARED FROM POLYETHYLENE WITH MULTIMODAL MOLECULAR WEIGHT DISTRIBUTION FOR MAKING PIPES WITH IMPROVED MECHANICAL PROPERTIES | 2006 |
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RU2429253C2 |
