New Trimodal Polyethylene for Blow Molding
A blow molding, polyethylene technology, applied in the field of new tri-modal polyethylene, can solve the problem of not being suitable for multi-modal
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[0052] Samples for measurement were prepared as follows: 2.2 g of resin material was used to fill a template of 70×40×1 mm. The plate was placed in an extruder and heated to 200° C. for 1 minute under a pressure of 20-30 bar. After reaching 200° C., the samples were pressed at 100 bar for 4 minutes. After the pressing time has elapsed, the material is cooled to room temperature and the plate is removed from the formwork. A rectangular film of 12 x 11 x 1 mm was cut out from the pressed polymer plate pressed to a thickness of 1 mm as a test piece for measuring tensile hardening.
[0053] GPC for determination of molecular weight parameters
[0054] Molar mass Mn, M w Determination (and peak molecular weight Mp if required) is carried out by high temperature gel permeation chromatography using the method described in DIN 55672-1: 1995-02 (=issued February 1995). The changes according to the above DIN standard are as follows: the solvent is 1,2,4-trichlorobenzene (TCB), the...
Embodiment 1
[0063] Embodiment 1 (according to the present invention)
[0064] a) Preparation of catalyst component A:
[0065] 4.0kg (35mol) of commercially available Mg(OC 2 h 5 ) 2 at 25dm 3 The suspension in the diesel oil (hydrogenated petroleum fraction) with a boiling range of 140-170 ° C is in a high-speed disperser (Krupp Supraton TM type S200) at 120° C. for 12 hours to form a gel-like dispersion. The Mg(OC 2 h 5 ) 2 The dispersion is transferred to a 130dm equipped impeller agitator and baffle 3 reactor, which already contains 19dm 3 of diesel. use 5dm 3 Diesel 7.6dm with diesel after flushing 3 (=70 moles)TiCl 4 Dilute to 10dm 3 , and then added over 6 hours at 70 °C and a stirring speed of 80 rpm. The mixture was then heated at T=120° C. for 5 hours. Then add 50dm 3 Diesel oil (hydrogenated petroleum fraction) with a boiling range of 140-170°C and the mixture was cooled to T=65°C. After the solids have settled, the supernatant liquid phase (mother liquor) i...
Embodiment 2
[0091] Example 2 (according to the invention): L-ring cylinder, industry standard
[0092] Ethylene is polymerized in a continuous process in three reactors arranged in series. 20.3 mmol / h of Ziegler preactivated catalyst component A prepared as described in the above experimental part 1.a together with 79 mmol / h of triethylaluminum-alkyl (TEA) (with 0.4 mmol / l Active Al) is fed into the first reactor together with sufficient diluent (hexane), ethylene and hydrogen. The amount of ethylene (=50 kg / h) and hydrogen (=24 g / h) in the first reactor was adjusted so that the percentages of ethylene and hydrogen measured in the gas phase of the first reactor were 37% by volume and 43% by volume, respectively , and the rest is a mixture of nitrogen and vaporized diluent. Polymerization in the first reactor was carried out at 80°C.
[0093] The slurry from the first reactor was then transferred to a second reactor in which the percentage of hydrogen in the gas phase had been reduced...
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