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Polyethylene resin for large-diameter winding pipe and industrial production method thereof

A polyethylene resin and production method technology, applied in chemical instruments and methods, chemical/physical processes, chemical/physical/physical chemical processes, etc., can solve problems such as insufficient rigidity, smoke and odor, and high oligomer content, and achieve Improve processing speed, good mechanical properties, high melt index effect

Active Publication Date: 2019-12-31
SHAANXI YANCHANG CHINACOAL YULIN ENERGY CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The production of large-diameter winding pipe polyethylene (for example, YC6100M) can adopt the oily slurry polymerization process of Mitsui, Japan, but because this process uses titanium-based catalysts, the produced The molecular weight distribution of the product is wide, and the product performance cannot meet the diversified needs of downstream production enterprises (the molecular weight distribution is relatively wide, and the product processing performance is relatively good, but the final product is prone to sag and insufficient rigidity; the content of oligomers is high. , prone to smoke and odor problems during downstream processing)
However, there is no report on the production of large-diameter winding pipe polyethylene by using the double-loop pipe slurry process.

Method used

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  • Polyethylene resin for large-diameter winding pipe and industrial production method thereof
  • Polyethylene resin for large-diameter winding pipe and industrial production method thereof
  • Polyethylene resin for large-diameter winding pipe and industrial production method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1. Preparation of high-density polyethylene

[0042] The polymerization reaction is carried out on a double-loop slurry process unit. The process unit mainly includes catalyst activation unit, material refining unit, catalyst feeding unit (the catalyst feeding unit is used to prepare the activated chromium-based catalyst and pure isobutane according to a certain concentration) and the polymerization reaction unit (No. first reactor and second reactor). The process steps are as follows:

[0043] (1) Catalyst activation

[0044] Using an externally purchased chromium-based catalyst containing trivalent chromium supported by inert silica (for example, trivalent chromium salts such as chromium acetate or chromium acetylacetonate, these chromium salts are loaded on a porous amorphous silicon carrier), the catalyst The mass fraction of chromium in the medium is 1% [=0.192mmol (Cr) / g (catalyst)]±0.1%.

[0045] The chromium-based catalyst is specifically activated in an act...

Embodiment 2

[0072] Different from the process parameter control in Example 1: the reaction temperature of the two reactors, the concentration ratio of the comonomer hexene to ethylene are mainly changed.

[0073] The specific production process control parameters of the two reactors are shown in Table 5, the residence time of the first reactor is 2 hours, and the residence time of the second reactor is 0.7 hours.

[0074] The reaction condition of the polyethylene powder that table 5. embodiment 2 produces

[0075]

[0076] When the reaction temperature of the first reactor reaches 101°C and the temperature of the second reactor reaches 100°C, the melt mass flow rate (21.6Kg / 190°C) of polyethylene powder and pellets can reach 13-15g / Within 10 minutes; the amount of hexene in the first reactor is 38.5Kg / h, and the amount of hexene in the second reactor is 28.7Kg / h, so that the density of polyethylene pellets can reach 0.954-0.958g / cm 3 within range.

[0077] The high-density polyethy...

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Abstract

The invention discloses polyethylene resin for a large-diameter winding pipe and an industrial production method thereof. According to the invention, polyethylene powder with high density and narrow molecular weight distribution is produced by adopting a double-ring pipe slurry process and a chromium catalyst, and is subjected to melt extrusion granulation with a main antioxidant, an auxiliary antioxidant, stearic acid and the like to obtain the polyethylene resin. The large-diameter winding pipe made of the polyethylene resin has the advantages of light weight, convenience in connection and the like, also has good mechanical strength, stress cracking resistance, creep resistance and cold resistance, and can be widely applied to the fields of municipal underground drainage, pollution discharge, rainwater collection, road engineering drainage, ventilation and the like.

Description

technical field [0001] The invention relates to the preparation of polyethylene products, in particular to a polyethylene resin for large-diameter winding pipes and an industrial production method thereof. Background technique [0002] Large-diameter winding pipe is a kind of special-shaped structural wall pipe made by spiral winding process. High-density polyethylene large-diameter winding pipe is referred to as "carat pipe". It uses high-density polyethylene (HDPE) as the raw material, and is made by hot winding molding process in the hot melt state, and is cooled by rolling air cooling in the hot state before demolding, the pipe gradually dissipates heat, and the wall thickness is uniform. High-density polyethylene large-diameter winding pipe is of great significance in reducing pollution and protecting the environment. [0003] The production of large-diameter winding pipe polyethylene (for example, YC6100M) can adopt the oily slurry polymerization process of Mitsui, J...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/16C08F210/14C08F2/00C08F4/69C08F2/01B01J8/00B01J8/06B01J19/24C08L23/08
CPCC08F210/16B01J19/242B01J8/00B01J8/06C08L23/0815C08F2/001C08F4/69C08F2/01C08F210/14C08F2500/07C08F2500/03C08F2500/12Y02P20/52
Inventor 刘升杜杰李国军刘浪霍金兰蔡立恒
Owner SHAANXI YANCHANG CHINACOAL YULIN ENERGY CHEM
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