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Polyethylene film and preparation method thereof

A polyethylene film, polyethylene technology, applied in the field of polyethylene film, can solve problems such as poor mechanical properties and optical properties

Active Publication Date: 2017-11-03
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 provide a polyethylene film with high mechanical properties, optical properties and heat-sealing strength, a A kind of preparation method of polyethylene film and the polyethylene film prepared by this method

Method used

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Embodiment approach

[0027] According to a preferred embodiment of the present invention, the first 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 proporti...

Embodiment 1

[0045] This embodiment is used to illustrate the polyethylene film provided by the present invention and its preparation method.

[0046] (1) Preparation of polyethylene composition:

[0047] The first polyethylene composition provided in this embodiment is composed of component A, component B and component C, and the second polyethylene composition is composed of component D. Among them, component A, component B, component C and component D are linear low density polyethylene (LLDPE) of ethylene / alpha olefin copolymerization, and all adopt the same catalyst system (Ziegler-Natta catalyst) Compared with the preparation by polymerization process, the difference lies in the amount of hydrogen added when preparing different components and the type and molar content of α-olefin comonomers. Specific steps are as follows:

[0048] Add ethylene, α-olefin, hydrogen and nitrogen (ethylene, α-olefin, hydrogen and nitrogen are of polymerization grade, used after removing water and oxyg...

Embodiment 2

[0059] This embodiment is used to illustrate the polyethylene film provided by the present invention and its preparation method.

[0060] (1) Preparation of polyethylene composition:

[0061] The first polyethylene composition provided in this embodiment is composed of component A, component B and component C, and the second polyethylene composition is composed of component D. Wherein, component A, component B, component C and component D are linear low density polyethylene (LLDPE) of ethylene / alpha olefin copolymerization, and all adopt identical catalyst system (Ziegler-Natta catalyst system ) and polymerization process, the difference lies in the amount of hydrogen added when preparing different components and the type and molar content of α-olefin comonomers. Specific steps are as follows:

[0062] Add ethylene, alpha olefin, hydrogen and nitrogen into the fluidized bed gas phase reactor, then add the Ziegler-Natta catalyst system, and then polymerize under the conditions ...

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Abstract

The present invention relates to the field of polymers, and provides a polyethylene film and a preparation method thereof. The polyethylene film comprises a polyethylene core layer and a polyethylene surface layer attached to at least one side surface of the polyethylene core layer, wherein the polyethylene core layer is formed from a first polyethylene composition containing a component A, a component B and a component C, the polyethylene surface layer is formed from a second polyethylene composition containing a component D, the components A, B, C and D respectively are ethylene / alpha olefin copolymerized linear low density polyethylene, the melt indexes of the components A, B, C and D at a temperature of 190 DEG C and a load of 2.16 kg respectively are 0.01-3.5 g / 10 min, 3.6-9.9 g / 10 min, 10-80 g / 10 min and 0.5-50 g / 10 min, and the densities of the components A, B, C and D respectively are 0.915-0.936 g / cm<3>, 0.915-0.930 g / cm<3>, 0.915-0.930 g / cm<3> and 0.880-0.910 g / cm<3>. The polyethylene film of the present invention has advantages of excellent mechanical property, excellent optical property, excellent heat sealing strength, and great industrial application prospect.

Description

technical field [0001] The invention relates to a polyethylene film, a preparation method of the polyethylene film and a polyethylene film prepared by the method. 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. Advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08B32B27/32B29D7/01
CPCB29D7/01B32B27/08B32B27/32B32B2250/242B32B2307/30B32B2307/40B32B2307/54B32B2323/046C08L23/0815C08L2203/16C08L2205/025C08L2205/03
Inventor 高达利张师军施红伟李汝贤郭梅芳邹浩李杰
Owner CHINA PETROLEUM & CHEM CORP
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