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CN-119286111-B - Polyethylene material, preparation method thereof and polyethylene product

CN119286111BCN 119286111 BCN119286111 BCN 119286111BCN-119286111-B

Abstract

The application relates to the technical field of modification of general polymer materials, in particular to a polyethylene material, a preparation method thereof and a polyethylene product, which comprise the following raw materials, by mass, 70-85 parts of first polyethylene, 5-15 parts of second polyethylene, 5-10 parts of third polyethylene, 1-5 parts of silicone auxiliary agent and 1-5 parts of coupling agent, wherein the weight average molecular weight of the first polyethylene is 24-35 ten thousand g/mol, the content of butene comonomer is 1% -4%, the melt flow rate is 0.2-0.5 g/10min, the weight average molecular weight of the second polyethylene is 60-300 ten thousand g/mol, the weight average molecular weight is 100 ten thousand and more than 25% -50%, the molecular weight distribution index is 30-300, and the weight average molecular weight of the third polyethylene is 5000g/mol-50000 g/mol.

Inventors

  • GU YANG
  • Liang Eryou
  • TIAN YU

Assignees

  • 万华化学集团股份有限公司

Dates

Publication Date
20260508
Application Date
20241115

Claims (15)

  1. 1. The polyethylene material is characterized by comprising the following raw materials in parts by weight: 70-85 parts of first polyethylene, wherein the weight average molecular weight of the first polyethylene is 24-35 ten thousand g/mol, the mass content of butene comonomer is 1-4%, the melt flow rate is 0.2-0.5 g/10min, the density of the first polyethylene is 0.9-1.0 g/cm 3 , the melt flow ratio is 20-30, the melt strength is 180-220mN, and the zero shear viscosity is 200000-500000 Pa.s; 5-15 parts of second polyethylene, wherein the weight average molecular weight of the second polyethylene is 60-300 ten thousand g/mol, the weight average molecular weight is 100 ten thousand or more, the mass ratio is 25% -50%, and the molecular weight distribution index is 30-300; 5-10 parts of third ethylene, wherein the weight average molecular weight of the third ethylene is 5000-50000 g/mol, and the molecular weight distribution index is 3-15; 1-5 parts of silicone auxiliary agent, wherein the weight average molecular weight of the silicone auxiliary agent is 100000g/mol to 200000g/mol; 1-5 parts of coupling agent, wherein the molecular formula of the coupling agent is as follows Wherein R 1 is selected from C1-C10 alkyl, R 2 、R 3 is independently selected from C1-C10 alkyl or C1-C10 alkoxy, and R 4 is selected from C5-C25 alkyl, the melt flow rate is measured at 190 ℃ under a 5kg load, and the melt flow ratio is the ratio of the melt flow rate at 190 ℃ under 21.6kg load divided by the melt flow rate at 190 ℃ under 5kg load.
  2. 2. The polyethylene material of claim 1, wherein R 4 in the coupling agent is selected from C5-C10 cycloalkyl groups.
  3. 3. The polyethylene material according to claim 1, wherein the first polyethylene has a weight average molecular weight of 30-35 ten thousand g/mol, a butene comonomer content of 1.5% -2.5%, and a melt flow rate of 0.2-0.3 g/10min.
  4. 4. The polyethylene material according to claim 1, wherein the first polyethylene has a density of 0.94 to 0.96g/cm 3 , a melt flow ratio of 25 to 30, a melt strength of 200 to 220mN, and a zero shear viscosity of 300000 to 500000 Pa-s.
  5. 5. The polyethylene material according to claim 1 or2, wherein the second polyethylene has a weight average molecular weight of 90 to 120 g/mol, wherein the weight average molecular weight is 100 ten thousand or more at a ratio of 25 to 35%, and the molecular weight distribution index is 40 to 50.
  6. 6. The polyethylene material according to claim 1 or2, wherein the silicone adjuvant comprises one or more of SILIMER 9100, SILIMER 9200, SILIMER 9300, SILIMER 5090.
  7. 7. The polyethylene material according to claim 1 or 2, wherein the coupling agent comprises one or more of octyl trimethoxy silane, cyclohexyl methyl dimethoxy silane, dodecyl trimethoxy silane, dodecyl methyl dimethoxy silane, dodecyl triethoxy silane, hexadecyl trimethoxy silane, octadecyl trimethoxy silane.
  8. 8. The polyethylene material of claim 7, wherein the coupling agent comprises one or more of hexadecyltrimethoxysilane, octadecyltrimethoxysilane.
  9. 9. Polyethylene material according to claim 1 or 2, characterized in that the raw material of the polyethylene material further comprises 0.05-2 parts by mass of an antioxidant and/or 0.05-0.15 parts by mass of an acid scavenger.
  10. 10. The polyethylene material according to claim 9, wherein the antioxidant comprises one or more of antioxidant 1076, antioxidant 168, and antioxidant 1010, and/or the acid scavenger comprises one or more of zinc stearate and calcium stearate.
  11. 11. A method for producing a polyethylene material according to any one of claims 1 to 10, characterized in that the raw materials of the polyethylene material are mixed and melt-extruded to produce the polyethylene material.
  12. 12. The method for producing polyethylene material according to claim 11, wherein the melt extrusion temperature is 180 to 230 ℃ and the rotational speed is 180 to 240 r/min.
  13. 13. The method for producing a polyethylene material according to claim 11, wherein the step of mixing comprises mixing raw materials other than the first polyethylene and the third polyethylene to obtain a mixture a, and then mixing the mixture a with the first polyethylene and the third polyethylene at 50 to 60 ℃ to obtain a mixture B.
  14. 14. A polyethylene article, characterized in that it is produced from a polyethylene material according to any one of claims 1 to 10 or a polyethylene material produced by a production method according to any one of claims 11 to 13.
  15. 15. The polyethylene article of claim 14, wherein the polyethylene article is a polyethylene pipe.

Description

Polyethylene material, preparation method thereof and polyethylene product Technical Field The application relates to the technical field of modification of general polymer materials, in particular to a polyethylene material, a preparation method thereof and a polyethylene product. Background Polyethylene (PE) pipelines have the advantages of excellent chemical corrosion resistance, good toughness, no pollution to conveying media and the like, are widely applied to the fields of urban water supply and drainage pipes, gas pipes and the like, and in addition, the PE pipelines are increasingly applied to the fields of ocean engineering, chemical medicines, mines and the like, for example, ocean cultivation net cages, water leisure platforms and the like are gradually favored by the market. As the application range of PE pipes is continuously enlarged, the demand of large-caliber PE pipes is gradually increased, and research on materials for large-caliber PE pipes is receiving more and more attention. The material for the large-caliber PE pipeline not only meets the basic physical property index of the polyethylene conventional material, but also meets the characteristic of sagging resistance in the production of the large-caliber pipeline. The current preparation methods of the anti-sagging High Density Polyethylene (HDPE) comprise three main types of reaction synthesis methods, chemical crosslinking methods and ultra-high molecular weight polyethylene addition methods. The reaction synthesis method is influenced by a catalyst and a reaction process, and has limited improvement effect on the sagging resistance of HDPE, the chemical crosslinking method can obviously improve the sagging resistance of HDPE, but the crosslinked HDPE limits the processing and recycling of the HDPE due to the crosslinked network structure, and the method for adding the ultra-high molecular weight polyethylene is generally limited by the difficult processing of the ultra-high molecular weight polyethylene, so that the effective balance of good processing performance and high sagging resistance cannot be realized. The common HDPE has poor anti-sagging performance, which results in limited application fields such as large-caliber pipes, large-capacity containers and the like, and the ultra-high molecular weight polyethylene molecular chain segments are particularly long, have abundant physical entanglement points as 'crosslinking points' of the system, greatly improve the anti-sagging performance of the common HDPE pipe material, but also have extremely poor processing performance due to serious entanglement of the molecular chain segments. Therefore, in order to solve the problem that the processability and the anti-sagging performance cannot be taken into account when the ultra-high molecular weight polyethylene is blended with the common HDPE, technical innovation work is developed. Disclosure of Invention Therefore, the application aims to solve the technical problem that the processability and the anti-sagging performance cannot be simultaneously achieved when the ultra-high molecular weight polyethylene is blended with the common HDPE in the prior art. The application provides a polyethylene material which comprises the following raw materials in parts by weight: 70-85 parts of first polyethylene, wherein the weight average molecular weight of the first polyethylene is 24-35 ten thousand g/mol, the content of butene comonomer is 1-4%, and the melt flow rate is 0.2-0.5 g/10min; 5-15 parts of second polyethylene, wherein the weight average molecular weight of the second polyethylene is 60-300 ten thousand g/mol, the weight average molecular weight is 100 ten thousand or more, the weight average molecular weight accounts for 25-50%, and the molecular weight distribution index is 30-300; 5-10 parts of third ethylene, wherein the weight average molecular weight of the third ethylene is 5000-50000 g/mol, and the molecular weight distribution index is 3-15; 1-5 parts of silicone auxiliary agent; 1-5 parts of coupling agent. In certain preferred embodiments, the first polyethylene has a weight average molecular weight of 30-35 ten thousand g/mol, a butene comonomer content of 1.5% -2.5%, and a melt flow rate of 0.2-0.3 g/10min. The first polyethylene, the second polyethylene, the third polyethylene and the coupling agent can be synthesized by a conventional synthesis method, and can also be purchased commercially. The first polyethylene may be, for example, a polyethylene available from Wanhua chemical group Co., ltd under the designations WH23050 and WH 4731B. Polyethylene under the trade name WH23050 is preferred. The polyethylene with the brand of WH23050 has a weight average molecular weight of 31 ten thousand g/mol, a butene comonomer content of 1.5%, a density of 0.950g/cm 3, a melt flow rate of 0.24g/10min, a melt flow ratio of 27, a melt strength of 236mN and a zero shear viscosity of 331794 Pa.s. The polyethylene with the brand