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Easy-to-process heat-resistant polyethylene composition and its preparation method

A technology of heat-resistant polyethylene and composition, which is applied in the field of easy-processing heat-resistant polyethylene composition and its preparation, can solve the problems of low critical shear rate and narrow molecular weight distribution of pipe materials, and achieve high and excellent pressure resistance The effect of processability

Active Publication Date: 2021-04-13
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Due to the polymerization process, polyethylene resin, and additive system used in the above patents, the molecular weight distribution of the prepared pipe material is narrow, the critical shear rate is low, and the processing speed still needs to be further improved

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1-5

[0031] The proportioning components of the easy-to-process heat-resistant polyethylene composition used in the production of heat-resistant polyethylene pipes are shown in Table 1.

[0032]Density is tested according to GB / T 1033.2-2010, using method D, tested after boiling for 30 minutes; melt mass flow rate (MFR) is tested according to GB / T 3682-2000, with a load of 2.16kg; molecular weight and its distribution are tested using gel Permeation chromatography (GPC) method, two chromatographic columns are connected in series, the solvent and mobile phase are both 1,2,4-trichlorobenzene (containing 0.1% antioxidant 2,6-dibutyl-p-cresol), the column temperature 150°C, dissolved for 4 hours, flow rate 1.0ml / min, using narrow distribution polystyrene standard sample for universal calibration; material storage modulus, energy loss modulus, complex shear viscosity using rotational rheology, ф25mm parallel plate, The gap between the parallel plates is 1mm, at 190°C at 10 -1 A dynamic...

Embodiment 6

[0046] Performance test experiment

[0047] The notched impact strength is tested according to GB / T 1043.1-2008, A-type notch, 23 ° C on domestic equipment and imported equipment to conduct the processing test of ф20*2.0mm floor heating pipes, record the processing speed and current; the composition is prepared into After the pipe with the specification of ф20*2.0mm, the hydrostatic strength of the pipe is tested according to GB / T 18252-2000; the capillary rheological property is tested according to GB / T25278-2010 to obtain the critical shear rate of the pipe material, and the test temperature is 200°C .

[0048] The performance test results are shown in Table 3-4.

[0049] Table 3 embodiment 1-5 performance test result

[0050] Test items Example 1 Example 2 Example 3 Example 4 Example 5 Charpy notched impact strength, kJ / m 2

38 41 36 36 33 critical shear rate, s -1

350 300 400 500 400 Extrusion processing speed, m / min 33...

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Abstract

The invention belongs to the technical field of polymer materials, and in particular relates to an easy-to-process heat-resistant polyethylene composition and a preparation method thereof. The easy-to-process heat-resistant polyethylene composition of the present invention is made of the following components in parts by weight: 100 parts of heat-resistant polyethylene resin, 0.2-0.5 part of antioxidant, 0.01-0.03 part of processing aid; The heat-resistant polyethylene resin is a copolymer of ethylene and 1-hexene produced by a gas phase process and a metallocene catalyst. The reaction temperature is 91-93°C and the reaction pressure is 2.0-2.2MPa. The polyethylene composition of the invention has excellent processability, pressure resistance and high critical shear rate.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to an easy-to-process heat-resistant polyethylene composition and a preparation method thereof. Background technique [0002] Polyethylene of raised temperature resistance (PE-RT) pipe material is a special polyethylene material with high temperature resistance, excellent hydrostatic resistance and no need for cross-linking. As a new generation of heat-resistant pipe material, it has been widely used in recent years. The plastic pipe industry with high operating temperature has been gradually adopted, and the product has been actively researched and developed at home and abroad. Because of its excellent stability, good low-temperature impact resistance, and hot-melt connection, it has been applied in many domestic fields, such as floor heating pipes, solar pipes, and thermal pipe networks. Heat-resistant polyethylene pipe materials are currently mainly used in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08L27/18C08K5/526C08K5/13C08K5/134
CPCC08K2201/014C08L23/0815C08L2201/08C08L2203/18C08L27/18C08K5/526C08K5/13C08K5/1345
Inventor 王群涛郭锐王日辉高凌雁许平石晶
Owner CHINA PETROLEUM & CHEM CORP
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