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Polyethylene composition and its film

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

Active Publication Date: 2022-05-24
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 overcome the problems 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, and to provide a new polyethylene composition and The film made of ethylene composition, the polyethylene composition obtained by the inventors of the present invention through the use of Component A, Component B, Component C, Component D and Component E with specific melt index and density uses When the flat film stretching method is used to prepare polyethylene film, it has the advantages of large stretching ratio, high mechanical strength, high film forming rate and excellent barrier performance, and has great industrial application prospects

Method used

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  • Polyethylene composition and its film
  • Polyethylene composition and its film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0037] According to a preferred embodiment of the present invention, the polyethylene composition is figure 1Prepared in the multi-reactor parallel device shown, the multi-reactor parallel device includes the first reactor 1, the second reactor 2, the third reactor 3, the fourth reactor 7, solid / liquid (gas) Separator 4, homogenization silo 5 and melt granulation system 6, wherein the first reactor 1, the second reactor 2, the third reactor 3 and the fourth reactor 7 are connected in parallel, and the solid / The number of liquid (gas) separators 4 is four, which are respectively communicated with the first reactor 1, the second reactor 2, the third reactor 3 and the fourth reactor 7, and the group prepared by the first reactor 1. Component A, component B prepared by the second reactor 2, component C prepared by the third reactor 3, and component D prepared by the fourth reactor 7 are separated at different solid / liquid (gas) Phase separation is carried out in the device 4, an...

Embodiment 1

[0056] This example is used to illustrate the polyethylene composition and barrier film provided by the present invention.

[0057] (1) Preparation of polyethylene composition:

[0058] The polyethylene composition provided in this embodiment consists of component A, component B, component C, component D and component E, wherein component A, component B, component C and component D are all Linear low density polyethylene (LLDPE) of ethylene-alpha olefin copolymerization, and all adopt the same catalyst system (Ziegler-Natta catalyst, which is the Ziegler-Natta catalyst system prepared by CN101838351A Example 1, the following The difference is that the amount of hydrogen added when preparing different components and the type and molar content of alpha olefin comonomers are different; component E is POE barrier masterbatch P1. Specific steps are as follows:

[0059] Add ethylene, alpha olefin, hydrogen and nitrogen (ethylene, alpha olefin, hydrogen and nitrogen are all polymer...

Embodiment 2

[0070] This example is used to illustrate the polyethylene composition and barrier film provided by the present invention.

[0071] (1) Preparation of polyethylene composition:

[0072] The polyethylene composition provided in this embodiment consists of component A, component B, component C, component D and component E, wherein component A, component B, component C and component D are all Linear low density polyethylene (LLDPE) copolymerized with ethylene-alpha olefins, and all are prepared by the same catalyst system (Ziegler-Natta catalyst) and polymerization process, the difference lies in the amount of hydrogen added and the alpha of the different components. The type and molar content of olefin comonomers vary; component E is POE barrier masterbatch P1. Specific steps are as follows:

[0073] Add ethylene, alpha olefin, hydrogen and nitrogen into the fluidized bed gas phase reactor, then add the Ziegler-Natta catalyst system, and then polymerize at a temperature of 84-...

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Abstract

The invention relates to the field of polyethylene materials, and discloses a polyethylene composition, which is characterized in that the polyethylene composition contains component A, component B, component C, component D and component E; wherein, At a temperature of 190°C and a load of 2.16 kg, the MI of component A A 0.01‑3.5g / 10min, ρ A 0.880‑0.936g / cm 3 ;MI of component B B 3.6‑9.9g / 10min, ρ B 0.910‑0.930g / cm 3 ;MI of component C C 16‑80g / 10min, ρ C 0.880-0.930g / cm 3 ;MI of component D D 10-15g / 10min, ρ D 0.880-0.930g / cm 3 ; Component E is obtained by granulating ethylene octene copolymer, polyethylene glycol and aerogel through twin-screw extrusion. When the polyethylene composition obtained by using the above-mentioned component A, component B, component C, component D and component E with specific melt index and density in combination is used to prepare polyethylene film by flat film stretching method, it has The advantages of large stretching ratio, high film forming rate, high mechanical strength and excellent barrier properties have great industrial application prospects.

Description

technical field [0001] The present invention relates to the field of polyethylene materials, in particular, to a polyethylene composition and a film thereof. Background technique [0002] Biaxially Oriented Polyethylene (BOPE) film is a film material formed by biaxially stretching polyethylene (PE) resin with special molecular structure. In the forming process of BOPE film, after the film is stretched, the PE macromolecular chain and crystalline structure are highly oriented, which significantly improves the tensile strength of the film, reduces the tensile elongation at break, and makes the film's 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, B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08J5/18
CPCC08J5/18C08J2323/08C08J2423/08
Inventor 邵静波张师军高达利白弈青徐萌
Owner CHINA PETROLEUM & CHEM CORP