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Polyethylene composition and thin film thereof

A technology of polyethylene and composition, applied in the field of polyethylene composition and its film, can solve the problems of poor film-forming property, easy film rupture and the like

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of poor film-forming properties and easy rupture of the film when the existing polyethylene raw material is prepared by the flat film stretching method, which is not suitable for preparing films by the flat film stretching method. Provide a new polyethylene composition and film made from the polyethylene composition

Method used

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  • Polyethylene composition and thin film thereof
  • Polyethylene composition and thin film thereof

Examples

Experimental program
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Embodiment approach

[0030] 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

[0046] This example is used to illustrate the polyethylene composition and film thereof provided by the present invention.

[0047] (1) Preparation of polyethylene composition:

[0048] The polyethylene composition provided in this example is composed of component A, component B and component C, and these three components are linear low density polyethylene (LLDPE) copolymerized with ethylene / α olefin, and all adopt the same The catalyst system (metallocene catalyst) and the preparation of the polymerization process are different in the amount of hydrogen added when preparing different components and the type and molar content of the α-olefin comonomer. Specific steps are as follows:

[0049] 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 s...

Embodiment 2

[0059] This example is used to illustrate the polyethylene composition and film thereof provided by the present invention.

[0060] (1) Preparation of polyethylene composition:

[0061] The polyethylene composition provided in this example is composed of component A, component B and component C, and these three components are linear low density polyethylene (LLDPE) copolymerized with ethylene / α olefin, and all adopt the same The catalyst system (metallocene catalyst) and the preparation of the polymerization process are different in the amount of hydrogen added when preparing different components and the type and molar content of the α-olefin comonomer. Specific steps are as follows:

[0062] 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 1.8-2.0MPa to obtain the components respectively A, component B and component C. Among the...

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Abstract

The invention provides a polyethylene composition and a thin film thereof. The polyethylene composition contains a component A and a component C and optionally contains a component B; the component A is ethylene / alpha olefin copolymerized linear low-density polyethylene, the melt index MIA is 0.01-2 g / 10 min at the temperature of 190 DEG C and the load of 2.16 kg, and the density [rho]A is 0.880-0.936 g / cm<3>; the component B is ethylene / alpha olefin copolymerized linear low-density polyethylene, the melt index MIB is 2.1-14.9 g / 10 min at the temperature of 190 DEG C and the load of 2.16 kg, and the density [rho]B is 0.910-0.930 g / cm<3>; the component C is ethylene / alpha olefin copolymerized linear low-density polyethylene, the melt index MIC is 15-150 g / 10 min at the temperature of 190 DEG C and the load of 2.16 kg, and the density [rho]C is 0.880-0.930 g / cm<3>. When the polyethylene thin film is prepared from the polyethylene composition by a flat film stretching method, the stretching ratio is large, the film forming speed is high, and the film forming property is quite good.

Description

technical field [0001] The present invention relates to a polyethylene composition and its film. Background technique [0002] Biaxially Oriented Polyethylene (BOPE) film is a film material formed by a polyethylene (PE) resin with a special molecular structure through a biaxial stretching process. In the forming process of BOPE film, after the film is stretched, the PE macromolecular chain and crystal structure are highly oriented, which significantly improves the tensile strength of the film, reduces the tensile elongation at break, and makes the film Lower haze, higher gloss and better clarity. In addition, compared with polyethylene film products prepared by extrusion blow molding process and extrusion casting process in the prior art, BOPE film has high mechanical strength, good puncture resistance and impact resistance, excellent optical properties, energy saving and environmental protection, etc. Advantage. Therefore, BOPE film can be widely used in packaging bags, ...

Claims

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Application Information

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IPC IPC(8): C08L23/08B32B27/06B32B27/32B29C55/14
Inventor 高达利杨庆泉李汝贤张师军邹浩邵静波张丽英董穆李杰刘建叶施红伟吕明福尹华权慧吕芸初立秋白弈青徐耀辉徐萌徐凯郭鹏徐毅辉
Owner CHINA PETROLEUM & CHEM CORP