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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

Active Publication Date: 2021-11-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide polyethylene resin composition, polyethylene resin pellets, polyethylene expanded beads and preparation thereof in order to overcome the intermittent polyethylene foamed beads production process in the prior art, complex process and other problems. Method and polyethylene expanded bead molded article

Method used

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  • Polyethylene resin composition, polyethylene resin pellets, polyethylene foam beads, preparation method and molded body thereof
  • Polyethylene resin composition, polyethylene resin pellets, polyethylene foam beads, preparation method and molded body thereof
  • Polyethylene resin composition, polyethylene resin pellets, polyethylene foam beads, preparation method and molded body thereof

Examples

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Embodiment approach

[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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Abstract

The invention relates to the field of expanded polyethylene, in particular to a polyethylene resin composition, a method for preparing polyethylene resin pellets, polyethylene expanded beads and a molded body thereof. The composition contains 100 parts by weight of polyethylene base resin, 0.1-0.3 parts by weight of antioxidant, 0.25-10 parts by weight of mixed olefin-maleic anhydride copolymerized microspheres, wherein the particle diameter of mixed olefin-maleic anhydride copolymerized microspheres 0.05-2μm. The foamed beads prepared from the composition of the present invention through the method of the present invention have a denser and more uniform cell structure, uniform pore size, complete appearance without rupture, and lower density. In addition, the foamed beads have a non-crosslinked structure, so they can be recycled without causing secondary pollution, and meet the requirements of circular economy. Formings made from the expanded beads of the present invention have higher compressive strength and better resistance to thermal and oxidative aging.

Description

technical field [0001] The invention relates to the field of foamed polyethylene, in particular to a polyethylene resin composition, polyethylene resin pellets, polyethylene foamed beads, a preparation method thereof, and a molded polyethylene foamed bead. Background technique [0002] Today, polyethylene foam products are usually mass-produced industrially using extrusion foaming technology. [0003] Compared with the traditional extrusion foaming method, when the polyethylene foam product is prepared by the reactor impregnation method, there will be no high-shearing effect of screw extrusion on the polyethylene melt by the extrusion method, and the entanglement of the polymer chains ensures that the melt The body has sufficient strength. During the cell growth process, the biaxial stretching of the cell wall is not easy to break; at the same time, the PE crystals are not completely melted during the foaming process, and these residual crystals act as physical cross-linkin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L35/00C08K5/103C08K5/134C08K5/526C08J9/00
CPCC08J9/0061C08J2323/08C08J2435/00C08K5/103C08K5/1345C08K5/526
Inventor 郭鹏徐耀辉吕明福解娜张师军徐萌高达利
Owner CHINA PETROLEUM & CHEM CORP
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