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Polyethylene composition for woven bag coating material and preparation method thereof

A technology of polyethylene and composition, which is applied in the field of polyethylene composition of woven bag coating material and its preparation, can solve the problem of large transverse width shrinkage, narrow coating width, unsatisfactory LDPE coating performance, etc. problems, to achieve the effect of narrow width, wide coating width and easy process control

Active Publication Date: 2012-11-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above two methods improve the coating performance of high-density polyethylene by adding LDPE, but the coating performance of LDPE produced by the tubular method alone is still unsatisfactory, especially the transverse width shrinkage is too large, resulting in a large coating width. narrow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get 1900g low density polyethylene 2420M (LDPE 2420M, Maoming Petrochemical production, density is 0.923g / cm 3 ; Melt index 7.0g / 10min (190 ℃ / 2.16kg), molecular weight distribution width is 4.7), high density polyethylene TR570 (HDPE TR50, Maoming Petrochemical production, density 0.953g / cm 3 Melt index 5.0g / 10min (190 ℃ / 21.6kg), molecular weight distribution width 16.7) 95g, antioxidant 1010 (Switzerland Ciba Geigy production) 20g, the combination material that takes by weighing joins in the high-speed mixer, mixes 4 minutes to form a homogeneous mixture. Then feed it into a twin-screw extruder to melt, blend and extrude it into strips, and then cut into pellets with a pelletizer to obtain sample No. 1.

[0030] The processing technology is: the temperature of the first zone of the twin-screw extruder is 176°C, the temperature of the second zone is 187°C, the temperature of the third zone is 191°C, the temperature of the fourth zone is 191°C, the temperature of the f...

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PUM

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Abstract

The invention relates to a polyethylene composition for woven bag coating material and a preparation method thereof. The composition comprises the following ingredients mixing together: low density polyethylene and high density polyethylene in a weight ratio of 80:20 to 99:1. The density of the composition is 0.915 to 0.935g / cm3, MFR (Melt Flow Rate) (190 DEG C / 2.16 kg) is 2.5 to 7.0g / 10min, and Mw / Mn molecular weight distribution width is 4.0 to 7.0. The polyethylene composition is prepared through smelting and extruding the mixture of all the mentioned materials in mentioned amount. The polyethylene composition has the advantages of excellent processing rheological behavior, large coating width, small retraction amplitude, simple preparation method, and easily-controlled technique.

Description

technical field [0001] The invention relates to a coating-grade polyethylene composition, and more specifically, to a polyethylene composition used for coating materials for woven bags and a preparation method thereof. Background technique [0002] Polyethylene resin is used for surface coating of plastic woven bags, paper-plastic composite, adhesive layer, film composite, etc. It has the characteristics of high strength, good toughness, strong adhesion, uniform film formation, good heat sealing, waterproof, moisture-proof, etc. . Coating-grade LDPE is generally obtained by polymerizing ethylene under high pressure, and the production process is generally a kettle method and a tubular method. LDPE usually has excellent processing properties, but leads to poor mechanical properties of the film. Therefore, people often mix LDPE with other polymers to obtain coated films that are easy to process and have excellent properties. In the extrusion coating process, an extruder forc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C09D123/06D06M15/227
Inventor 张龙贵徐焕刘宣伯张红彬王良诗郭梅芳
Owner CHINA PETROLEUM & CHEM CORP
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