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Formula for improving ESCR (environmental stress cracking resistance) performance of high-density polyethylene and preparation method of formula

A high-density polyethylene, high-performance technology, applied in the field of improving high-density polyethylene ESCR performance, can solve the problems of environmental stress cracking resistance, poor ESCR performance, and limited application range, etc., to achieve improved melt strength, excellent mechanical properties, The effect of improving performance indicators

Active Publication Date: 2015-06-17
陕西伟星新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As we all know, in order to ensure a high tensile yield strength of high-density polyethylene, its environmental stress cracking resistance (ESCR) performance must be reduced
Especially for some hollow materials, due to poor ESCR performance, its application range is severely limited
Nowadays, high tensile yield strength and ESCR performance can be achieved simultaneously by increasing the molecular weight of polyethylene or bimodal technology, but the high cost and complicated polymerization process often limit its application range

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The concrete preparation method of above-mentioned formula comprises the following steps:

[0048] 1) The high-density polyethylene is tested for the melt flow index, and the melt flow index MI is set to 0.5-4.0;

[0049] 2) Weigh 100 parts of high-density polyethylene by weight and put it into the mixer, then mix 0.5-1.25 parts of unsaturated silane and 0.01-0.05 parts of initiator and spray them into the mixer together, and mix at room temperature for 5- 8 minutes, stop;

[0050] 3) Melt, extrude and granulate the above mixed mixture with a twin-screw extruder, the processing temperature is 180°C, and the twin-screw speed is 250-300 rpm;

[0051] 4) Dry the granulated silane-grafted high-density polyethylene masterbatch at 80°C for 4 hours and then pack it in vacuum for later use.

[0052] In order to improve the ESCR performance, the present invention studies the melt flow index and the corresponding formula parts, and distinguishes the required parts of the melt f...

Embodiment 1

[0058] Embodiment 1: The modification method of the present invention is prepared by the following components and parts by weight: when detecting the melt flow index MI=0.5~1.0 of high-density polyethylene, then take 100 parts of high-density polyethylene, vinyl 0.5 parts of trimethoxysilane, 0.01 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, for later use; the method of use is as follows, firstly mix 100 parts of high-density polyethylene Put it in the mixer, and then mix the above 0.5 parts of vinyltrimethoxysilane and 0.01 parts of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane evenly and spray them into the mixer Inside, turn on the machine and stir at room temperature for 5-8 minutes. Then use a twin-screw extruder to melt-extrude and granulate, the processing temperature is 180°C, and the twin-screw speed is 250-300 rpm; the granulated silane-grafted high-density polyethylene masterbatch is dried at 80°C Vacuum-packed after 4 hours, it can be used for sample prep...

Embodiment 2

[0059] Embodiment 2: This embodiment is basically the same as Embodiment 1, the difference is: when the melt flow index MI=1.0~1.5 of the high-density polyethylene, then take 100 parts of high-density polyethylene, vinyl 0.8 part of trimethoxysilane, 0.02 part of 2,5-dimethyl-2,5-bis(t-butylperoxy)hexane.

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Abstract

The invention provides a formula for improving ESCR (environmental stress cracking resistance) performance of high-density polyethylene and a preparation method of the formula, and belongs to the technical field of high polymer materials. The formula is obtained by mixing 100 parts of high-density polyethylene by weight, 0.5-1.25 parts of unsaturated silane and 0.01-0.05 parts of initiator, fusing and extruding by a double-screw extruder, granulating, drying for 4 hours, and then packaging in vacuum. By adopting the technical scheme, silane groups are introduced into polyethylene molecule chains, and the chain extension of free radicals of macromolecular chains of the polyethylene is realized to enlarge the interaction force among the polyethylene molecule chains, so that the melt index (MI) is obviously reduced and the melt strength of resin in a molding process is increased to produce products with better performance; moreover, the concentration of the molecules among wafers is increased, the ESCR performance is increased to above 1000h, the design is unique, the technique is reasonable, the operation is convenient, the investment is small, and the requirement of industrial mass production can be realized.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for improving the ESCR performance of high-density polyethylene by adopting silane grafting technology, realizing the silane grafting of high crystallinity polyethylene, and significantly improving the ESCR performance . Background technique [0002] It is well known that in order to ensure a high tensile yield strength of high-density polyethylene, its environmental stress cracking resistance (ESCR) performance must be reduced. Especially for some hollow materials, their application scope is severely limited due to poor ESCR performance. Nowadays, high tensile yield strength and ESCR performance can be achieved simultaneously by increasing the molecular weight of polyethylene or bimodal technology, but the high cost and complicated polymerization process often limit its application range. Contents of the invention [0003] In view of the above-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02
Inventor 夏飞翔张伟娇胡波
Owner 陕西伟星新型建材有限公司
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