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Preparation method of high whiteness and high density polyethylene

A technology of high-density polyethylene and high whiteness, which is applied in the field of preparation of high-whiteness high-density polyethylene, and can solve problems such as the difficulty of applying high-density polyethylene products and the limitation of whiteness improvement

Active Publication Date: 2011-11-23
SHANGHAI SECCO PETROCHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the degree of whiteness improvement is still limited, and it is difficult to apply to high-density polyethylene products produced by chromium-based gas phase method.

Method used

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  • Preparation method of high whiteness and high density polyethylene
  • Preparation method of high whiteness and high density polyethylene
  • Preparation method of high whiteness and high density polyethylene

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preparation example Construction

[0046] The present invention provides a kind of preparation method of high whiteness high density polyethylene and the prepared high whiteness high density polyethylene thereof, described method comprises the following steps:

[0047] Described antioxidant comprises main antioxidant and auxiliary antioxidant, and wherein main antioxidant is 1,3,5-three (3,5-di-tert-butyl-4-hydroxybenzyl) isocyanuric acid, molecular formula For: C 48 h 69 N 3 o 6 , the structural formula is:

[0048]

[0049] The auxiliary antioxidant is dioctadecyl thiodipropionate, and its molecular formula is: C 42 h 82 o 4 S, the structural formula is:

[0050]

[0051] The processing aid is zinc calcium stearate processing aid, and the weight ratio of zinc stearate and calcium stearate in the processing aid is 1: 0.95~1: 1.05;

[0052] The metal ion deactivator is a polyhydric alcohol metal ion deactivator.

[0053] antioxidant

[0054] Described antioxidant comprises main antioxidant and a...

Embodiment

[0094]By using auxiliary antioxidant DSTDP containing 300ppm main antioxidant Irganox3114, 500ppm, 1000ppm zinc calcium stearate processing aid (the ratio of zinc calcium is 1: 1), 50ppm metal ion deactivator glycerol and 5ppm fluorescent whitening Antioxidant premixing system of agent OB, select high-speed co-rotating meshing twin-screw extruder, control the processing temperature of twin-screw extrusion at 210°C, screw speed at 300rpm / min, chromium-based high-density polyethylene products It has the best initial color; when the feeding speed is controlled at 0.75Hz, the system has the best color stability after several compound extrusions, and the color retention ability has been greatly improved.

[0095] According to the ISO1133 method, under the conditions of temperature 190°C and pressure 21.6Kg, the measured melt flow rate is 5-16.0g / 10min, the recommended melt flow rate is 8-11g / 10min, and the recommended density is 949-953kg / m3.

[0096] The above-prepared polyethyl...

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Abstract

The invention provides a preparation method of high whiteness and high density polyethylene. The preparation method comprises the following steps: a, providing a premix of a high density polyethylene base material and an assistant system which accounts for 0.18-0.20 wt% of the high density polyethylene base material, wherein the assistant system comprises an antioxidant, a processing assistant, ametal ion passivant, and a fluorescent whitening agent, the antioxidant comprises a main antioxidant 1,3,5-tri(3,5-ditertiarybutyl-4-hydroxybenzyl)isocyanuric acid and an auxiliary antioxidant distearyl thiodipropionate, the processing assistant is a zinc calcium stearate with a weight ratio of zinc stearate to calcium stearate of 1:0.95-1:1.05, and the metal ion passivant is a polyhydroxy alcohol metal ion passivant; and b, carrying out twin screw extrusion on the premix to obtain the high whiteness and high density polyethylene.

Description

technical field [0001] The invention relates to a preparation method of polyethylene, more particularly to a preparation method of high whiteness and high density polyethylene. More specifically, the present invention relates to a preparation method for improving the initial color of a chromium-based high-density polyethylene product and improving its color stability during multiple extrusion processes so that it can be reused multiple times. Background technique [0002] There are many reasons why polyolefin products tend to turn yellow, and there have been many literature reports at home and abroad. [0003] On the one hand, high-density polyethylene (HDPE) products in various stages of their synthesis, storage, processing and final application, due to the action of environmental factors such as light, heat, oxygen, produce hinges or chemical reactions of degradation, making the material color slow Slow yellowing, serious will lead to a significant decline in mechanical p...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08K5/3492C08K5/372C08K5/098C08K5/053
Inventor 谢国章冯友岳孙晓彤叶军黄晨王涛钱晓敏李士明茅振岗
Owner SHANGHAI SECCO PETROCHEM
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