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Polyethylene composition and film thereof

A polyethylene and composition technology, applied in the field of polyethylene composition and its film, can solve the problems of poor film-forming properties and easy cracking of the film, and achieve low haze, good strength and puncture resistance, excellent optical properties and mechanical properties performance effect

Active Publication Date: 2016-04-27
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 film thereof
  • Polyethylene composition and film thereof
  • Polyethylene composition and film thereof

Examples

Experimental program
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Effect test

Embodiment approach

[0021] According to a preferred embodiment of the present invention, the polyethylene composition contains component A, component C and optional component B; the component A is linear low density polyethylene copolymerized with ethylene / alpha olefin , its melt index MI at a temperature of 190°C and a load of 2.16kg A 0.01-2g / 10min, density ρ A 0.880-0.936g / cm 3 ; The component B is a linear low-density polyethylene copolymerized with ethylene / α-olefin, and its melt index MI at a temperature of 190°C and a load of 2.16kg B 2.1-14.9g / 10min, density ρ B 0.910-0.930g / cm 3 ; The component C is a linear low-density polyethylene copolymerized with ethylene / α-olefin, and its melt index MI at a temperature of 190°C and a load of 2.16kg C 15-150g / 10min, density ρ C 0.880-0.930g / cm 3 .

[0022] According to the polyethylene composition provided by the present invention, preferably, the melt index MI of the component A at a temperature of 190°C and a load of 2.16kg A 0.01-1.5g / 10m...

Embodiment 1

[0053] This example is used to illustrate the polyethylene composition and film thereof provided by the present invention.

[0054] (1) Preparation of polyethylene composition:

[0055] 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:

[0056] Add ethylene, α-olefin, hydrogen and nitrogen (ethylene, α-olefin, hydrogen and nitrogen are polymerization grade, used after removing water and oxygen, the same below) into the fluidized bed gas phase reactor, and then add the catalyst system ( The metallocene catalyst system is a supp...

Embodiment 2

[0066] This example is used to illustrate the polyethylene composition and film thereof provided by the present invention.

[0067] (1) Preparation of polyethylene composition:

[0068] 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:

[0069] 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 Component C. Among them, the control...

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Abstract

The invention provides a polyethylene composition and a film thereof. The polyethylene composition contains linear low density polyethylene obtained by ethene-alpha olefin copolymerization. The polyethylene composition has weight-average molecular weight Mw of 100000-180000g / mol, a ratio of Mw / Mn is in a range of 4.0-8.0, a ratio of Mz / Mw is in a range of 4.0-6.0 and a ratio of Mz+1 / Mw is in a range of 4.5-12.5. In polyethylene film preparation based on a flat membrane stretching method, the polyethylene composition has good stretching multiplying power, a high film forming rate and a good film forming ability.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08B32B27/06B32B27/32
Inventor 施红伟高达利唐毓婧殷建军乔金樑张师军王良诗郭梅芳于鲁强黄红红李汝贤尹华邹浩
Owner CHINA PETROLEUM & CHEM CORP
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