Polyethylene powder, composition, cross-linked polyethylene pipe and preparation methods of polyethylene powder and cross-linked polyethylene pipe

A technology for polyethylene powder and compound is applied in the fields of composition, polyethylene powder, cross-linked polyethylene pipe and preparation, and can solve the problems of uneven particle size distribution of polyethylene powder, high cost and complicated preparation method.

Inactive Publication Date: 2016-04-13
SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problem to be solved by the present invention is to overcome the defects of uneven particle size distribution, complicated preparation method and high cost of the po

Method used

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  • Polyethylene powder, composition, cross-linked polyethylene pipe and preparation methods of polyethylene powder and cross-linked polyethylene pipe
  • Polyethylene powder, composition, cross-linked polyethylene pipe and preparation methods of polyethylene powder and cross-linked polyethylene pipe
  • Polyethylene powder, composition, cross-linked polyethylene pipe and preparation methods of polyethylene powder and cross-linked polyethylene pipe

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Weigh 2g of anhydrous magnesium chloride and 2.77g of L29 multidentate ligand under a nitrogen atmosphere, add 25mL of tetrahydrofuran, start stirring and control the temperature of the oil bath at 80°C to reflux for 2 hours to form a clear and transparent solution system, then add 1.34mL tetrahydrofuran dropwise within 10min Titanium chloride, continue to reflux for 2 hours after the dropwise addition.

[0102]

[0103] After cooling the above solution to room temperature, add 50 mL of n-hexane to precipitate, filter, then add 50 mL of n-hexane to wash, stir and mix for 30 minutes, then filter, add 50 mL of hexane again to wash, stir and mix for 30 minutes, and then filter. The filter cake was vacuum-dried at 80 °C for 5 h to constant weight.

[0104] Among them, the molar ratio of anhydrous magnesium chloride and multidentate ligand is 2:1, the molar ratio of titanium tetrachloride and multidentate ligand is 1.15:1, the volume ratio of precipitant n-hexane and tetr...

Embodiment 2

[0107] Except following conditions, other is all identical with embodiment 1:

[0108] The magnesium compound is selected from anhydrous magnesium bromide;

[0109] The multidentate ligand is L21.

[0110]

[0111] Among them, the molar ratio of anhydrous magnesium bromide and multidentate ligand is 2:1, the molar ratio of titanium tetrachloride and multidentate ligand is 1.15:1, and the volume ratio of precipitant hexane and tetrahydrofuran is 2:1 , the volume ratio of the washing solvent hexane and tetrahydrofuran is 2:1.

[0112] The catalyst is designated as CAT-2, Ti content: 7.9 wt%.

Embodiment 3

[0114] Except following conditions, other is all identical with embodiment 1:

[0115] The magnesium compound is selected from methoxymagnesium chloride (Mg(OCH 3 )Cl);

[0116] The multidentate ligand is L20.

[0117]

[0118] Among them, methoxymagnesium chloride (Mg(OCH 3 )Cl) and the molar ratio of the multidentate ligand is 2:1, the molar ratio of titanium tetrachloride and the multidentate ligand is 1.15:1, the volume ratio of the precipitating agent hexane and tetrahydrofuran is 2:1, and the washing solvent has The volume ratio of alkanes and tetrahydrofuran is 2:1.

[0119] The catalyst is designated as CAT-3, Ti content: 8.4 wt%.

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Abstract

The present invention discloses polyethylene powder, a composition, a cross-linked polyethylene pipe and preparation methods of the polyethylene powder and the cross-linked polyethylene pipe. The polyethylene powder preparation method comprises that under the co-effect of a supported non-metallocene olefin polymerization catalyst and a co-catalyst, in the presence or absence of hydrogen, ethylene and alpha-olefin are subjected to slurry polymerization in an organic solvent, wherein the co-catalyst is one or a plurality of materials slected from an alkyl aluminum compound, a halogenated alkyl aluminum compound and alkyl aluminoxane. According to the present invention, the cross-linking degree of the obtained cross-linked polyethylene pipe can achieve more than or equal to 90%, the compression resistance can achieve and exceed the national standard related requirements, and the test results through the experiment examples show that the polyethylene powder prepared of the present invention has good environmental stress cracking resistance compared to the ethylene copolymer raw material prepared by using the existing technology.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a polyethylene powder, a composition, a cross-linked polyethylene pipe and a preparation method. Background technique [0002] Cross-linked polyethylene (PEX) pipes have excellent comprehensive properties, such as wide operating temperature range, high internal pressure resistance, excellent chemical corrosion resistance, and excellent environmental stress cracking resistance. Because the material of the tube does not contain toxic components, the inner wall tension is low, which can effectively prevent the formation of scale, and the inner wall of the tube is smooth, with excellent hydraulic properties, good bending performance, high creep resistance, and light weight It is easy to carry, maintain and install, so it is widely used in hot water pipes in construction or municipal engineering, ground radiant heating pipes, domestic water heater system configuration pipes, and fluid...

Claims

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Application Information

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IPC IPC(8): C08F210/16C08F4/645C08F4/654C08L23/08C08K5/14B29C47/92B29C48/92
Inventor 朱本虎彭爱青孙秀丽周娇龙李军方唐勇
Owner SHANGHAI INST OF ORGANIC CHEM CHINESE ACAD OF SCI
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