Polyethylene composition, foamed bead and preparation method thereof, and foamed bead molding body
A technology of polyethylene foaming and polyethylene, which is applied in the field of polyethylene compositions, and can solve the problems of high price of polyethylene foaming beads, limited application fields, and high equipment costs
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[0035] According to a preferred embodiment of the present invention, the polyethylene composition is figure 1 Prepared in the shown multi-reactor parallel device, described multi-reactor parallel device comprises first reactor 1, second reactor 2, third reactor 3, solid / liquid (gas) separator 4, homogenizer The silo 5 and the melt granulation system 6, wherein the first reactor 1, the second reactor 2 and the third reactor 3 are connected in parallel, and the number of the solid / liquid (gas) separator 4 is three One, communicated with the first reactor 1, the second reactor 2 and the third reactor 3 respectively, the component A produced by the first reactor 1, the component B produced by the second reactor 2 and the component B produced by the third reactor The component C prepared by the reactor 3 is phase-separated in different solid / liquid (gas) separators 4, and then the phase-separated component A, component B and component C are sent to the homogenizer in proportion si...
Embodiment 1
[0055] This example is used to illustrate the polyethylene composition, expanded beads and expanded bead molded body provided by the present invention and the preparation method thereof.
[0056] (1) Preparation of polyethylene composition:
[0057] The polyethylene composition provided in this embodiment contains component A, component B, component C, cell nucleating agent, lubricant and cell control agent. Wherein, component A, component B and component C are linear low density polyethylene (LLDPE) of ethylene / alpha olefin copolymerization, wherein, component A and component B adopt metallocene catalyst to prepare (the metallocene The catalyst system is the supported metallocene catalyst prepared by CN102453124A embodiment 1, the same below), and component C is prepared by using Ziegler-Natta catalyst (the Ziegler-Natta catalyst system is prepared by CN101838351A embodiment 1 prepared Ziegler-Natta catalyst system, the same below). Specific steps are as follows:
[0058] ...
Embodiment 2
[0076] This example is used to illustrate the polyethylene composition, expanded beads and expanded bead molded body provided by the present invention and the preparation method thereof.
[0077] (1) Preparation of polyethylene composition:
[0078] The polyethylene composition provided in this embodiment contains component A, component B, component C, cell nucleating agent, lubricant and cell control agent. Among them, component A, component B and component C are linear low-density polyethylene (LLDPE) copolymerized with ethylene / α olefin, wherein, component A and component B are prepared by metallocene catalyst, and component C is obtained by using Ziegler-Natta catalysts were prepared. Specific steps are as follows:
[0079] Add ethylene, alpha olefin, hydrogen and nitrogen into the fluidized bed gas phase reactor, then add the catalyst system, and then polymerize under the conditions of temperature 84-88°C and pressure 1.8-2.0MPa to obtain components A, Component B and ...
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