Antistatic polyethylene composition, polyethylene molded body and preparation method of polyethylene molded body
A polyethylene and composition technology, applied in the field of polymer materials, can solve the problems of unfavorable antistatic agent efficiency, inability to form a continuous conductive network, and easy agglomeration, etc., to achieve low production cost, good sheet integrity, and short reaction cycle short effect
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specific Embodiment approach
[0029] According to a specific embodiment of the present invention, the edge-modified graphene is prepared by a method comprising the following steps:
[0030] Step S1, adding purified or unpurified graphite powder into a high-pressure grinding disc kettle;
[0031] Step S2, passing carbon dioxide into a high-pressure grinding disc kettle and making it in a supercritical state to form a material comprising graphite powder and supercritical carbon dioxide;
[0032] Step S3, grinding the material containing graphite powder and supercritical carbon dioxide.
[0033] According to some embodiments of the present invention, the graphite powder is selected from flake graphite powder and expanded graphite powder, preferably, the particle size of the graphite powder is 10-80 mesh, preferably 20-60 mesh.
[0034] According to some embodiments of the present invention, prior to grinding, the graphite powder is preferably pre-purified, such as by ultrasonic cleaning and / or chemical treat...
Embodiment approach
[0044] According to one embodiment of the present invention, the polyethylene molding is a single-layer structure, and the polyethylene is medium density polyethylene. According to the present invention, the medium density polyethylene can be commercially available, preferably, the density of the medium density polyethylene is 0.930-0.940g / cm 3 , with a melt flow mass rate of 5-7 g / 10 min at a temperature of 190° C. and a load of 2.16 kg.
[0045] According to another embodiment of the present invention, the polyethylene molding is a multi-layer structure, including an inner layer, an intermediate layer and a surface layer;
[0046] The inner layer is a layer formed from a first polyethylene composition comprising polyethylene A and optionally a crosslinking agent;
[0047] The middle layer is a foam layer formed by a second polyethylene composition, and the second polyethylene composition includes polyethylene B and a foaming agent;
[0048] The surface layer is an antistat...
preparation example 1
[0113] This preparation example is used to illustrate the preparation of polyethylene intermediate layer and surface layer base resin.
[0114] PE101
[0115]The polyethylene base resin contains component α, component β, component γ and a lubricant. Among them, component α, component β and component γ are all linear low-density polyethylene (LLDPE) copolymerized with ethylene / α 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:
[0116] 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 syst...
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Abstract
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