Polyethylene resin composition, polyethylene resin pellets, polyethylene foam beads, preparation method and molded body thereof
A technology of polyethylene resin and composition, which is applied in the field of foamed polyethylene, can solve problems such as complex process, and achieve the effects of uniform pore size, complete shape, and good heat-oxidative aging resistance
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[0026] According to a preferred embodiment of the present invention, the composition content of the mixed C4 can be 5-10% by weight of 1-butene, 5-15% by weight of isobutene, 10-20% by weight of 1,3-butadiene, 1 , 5-15% by weight of 2-butadiene, 0.5-5% by weight of n-butane, 0.5-2% by weight of isobutane, 20-40% by weight of cis-2-butene, 2-10% by weight of trans-2-butene %, vinyl acetylene 5-20% by weight.
[0027] According to another preferred embodiment of the present invention, the composition content of the mixed C4 can be 0.1-2% by weight of 1-butene, 10-30% by weight of isobutene, 0.01-0.1% by weight of 1,3-butadiene, 0.5-5% by weight of n-butane, 30-40% by weight of isobutane, 20-40% by weight of cis-2-butene, and 5-20% by weight of trans-2-butene.
[0028] According to another preferred embodiment of the present invention, the composition content of the mixed C4 can be 5-15% by weight of 1-butene, 0.5-3% by weight of isobutene, 20-30% by weight of n-butane, cis-2-bu...
preparation example 1
[0094] The polyethylene base resin of this preparation contains component A, component B, component C and lubricant. Among them, component A, component B and component C are linear low-density polyethylene (LLDPE) copolymerized with ethylene-alpha olefin, and they are all prepared by the same catalyst system (metallocene catalyst) and polymerization process, the difference lies in the preparation The amount of hydrogen added and the type and molar content of α-olefin comonomers are different for different components. Specific steps are as follows:
[0095]Add ethylene, α-olefin, hydrogen and nitrogen (ethylene, α-olefin, hydrogen and nitrogen are all polymerization grade, used after removing water and oxygen, the same below) into the fluidized bed gas phase reactor, and then add the metallocene catalyst system (the metallocene catalyst system is the supported metallocene catalyst prepared in Example 1 of CN102453124A, the same below), and then polymerized at a temperature of ...
preparation example 2
[0103] The polyethylene base resin of this example contains Component A, Component B, Component C and a lubricant. Among them, component A, component B and component C are linear low-density polyethylene (LLDPE) copolymerized with ethylene-alpha olefin, and they are all prepared by the same catalyst system (metallocene catalyst) and polymerization process, the difference lies in the preparation The amount of hydrogen added and the type and molar content of α-olefin comonomers are different for different components. Specific steps are as follows:
[0104] Add ethylene, α-olefin, hydrogen and nitrogen into the fluidized bed gas phase reactor, then add the metallocene catalyst system, and then polymerize at a temperature of 84-88°C and a pressure of 1.8-2MPa to obtain component A respectively , Component B and Component C. Among them, the control of the melt index of component A, component B and component C is realized by adjusting the amount of hydrogen added, and the control ...
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