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Easy-to-process metallocene polyethylene composition and its preparation method

A technology for metallocene polyethylene and composition, which is applied in the field of easy-to-process metallocene polyethylene composition and its preparation, can solve problems such as affecting production efficiency and increasing production cost, and achieves improvement of optical properties, processing efficiency and processing performance. improved effect

Active Publication Date: 2019-07-30
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is to say, it takes at least 15 minutes to see a good dynamic balance effect, which affects production efficiency and increases production costs.

Method used

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  • Easy-to-process metallocene polyethylene composition and its preparation method
  • Easy-to-process metallocene polyethylene composition and its preparation method
  • Easy-to-process metallocene polyethylene composition and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Raw materials and parts by weight thereof for preparing the easy-to-process metallocene polyethylene composition are:

[0037]

[0038] The preparation steps of the easy-to-process metallocene polyethylene composition: Add polyethylene glycol, calcium stearate, zinc stearate, and antioxidant to the mLLDPE powder resin, mix in a high-speed mixer, and the stirring speed is 1200 rpm , the stirring time is 14min, and the stirring temperature is 40°C; the uniformly mixed material is put into a twin-screw extruder for melting, plasticizing, extruding, and granulating.

[0039] The length-to-diameter ratio of the screw is 34, and there are 6 shear blocks in the screw combination used, including 3 reverse shear blocks; the processing temperature is 190°C, and the vacuum is drawn during the granulation process, and the vacuum degree achieved by the granulation vacuum is -0.3 MPa.

Embodiment 2

[0041] Raw materials and parts by weight thereof for preparing the easy-to-process metallocene polyethylene composition are:

[0042]

[0043]The preparation steps of the easy-to-process metallocene polyethylene composition: Add polyethylene glycol, calcium stearate, zinc stearate, and antioxidant to the mLLDPE powder resin, mix in a high-speed mixer, and the stirring speed is 1700 rpm , the stirring time is 12min, and the stirring temperature is 37°C; the uniformly mixed material is put into a twin-screw extruder for melting, plasticizing, extruding, and granulating.

[0044] The length-to-diameter ratio of the screw is 38, and the screw combination used has 8 shear blocks, including 4 reverse shear blocks; the processing temperature is 210°C, and the vacuum is drawn during the granulation process, and the vacuum degree achieved by the granulation vacuum is -0.2 MPa.

Embodiment 3

[0046] Raw materials and parts by weight thereof for preparing the easy-to-process metallocene polyethylene composition are:

[0047]

[0048] The preparation method of this embodiment is the same as that of Example 1.

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Abstract

The invention relates to a metallocene polyethylene composition being easy to process and a preparation method of same and belongs to the field of high-molecular materials. The metallocene polyethylene composition is composed of, by weight, 100 parts of mLLDPE resin, 0.15-1.0 part of polyethylene glycol, 0.08-1.0 part of calcium stearate, 0.02-0.8 parts of zinc stearate, 0.02-0.08 parts of antioxidant 1076, and 0.06-0.24 parts of antioxidant 168. The metallocene polyethylene composition is simple in preparation method, has low cost and is environment-friendly. The preparation method can improve the processability of the material and significantly reduces melt viscosity of mLLDPE, which is beneficial to shaping process of the resin at low temperature and reduces energy consumption and shear heating during the processing. A thin film prepared from the composition is significantly improved in optical performances without reduction on strength. Processing efficiency of metallocene polyethylene is improved.

Description

technical field [0001] The invention relates to an easy-to-process metallocene polyethylene composition and a preparation method thereof, belonging to the field of polymer materials. Background technique [0002] Metallocene linear polyethylene films have broad application prospects due to their excellent mechanical, thermal, and optical properties. However, due to the structural characteristics of narrow relative molecular mass distribution and uniform composition distribution, it is more difficult to process than ordinary polyethylene. It has high melt viscosity, low shear sensitivity, low melt strength, high machine operating load, and is prone to melt fracture. . At present, there are various methods for improving the processing properties of metallocene polymers, such as introducing long-chain branching, bimodal MWD (abbreviation for Molecular Weight Distribution), wide MWD, terpolymers, and improving processing equipment, etc. These methods have high production costs ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L71/02C08K13/02C08K5/098C08K5/134C08K5/526B29B9/06B29C48/60
CPCB29B9/06B29C48/625C08J5/18C08J2323/08C08K2201/014C08L23/0815C08L2203/16C08L2205/025C08L2314/06C08L71/02C08K13/02C08K5/098C08K5/1345C08K5/526
Inventor 许平王日辉王群涛郭锐高凌雁石晶
Owner CHINA PETROLEUM & CHEM CORP
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