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Production method of ultra-high molecular weight polyethylene

An ultra-high molecular weight, polyethylene technology, applied in the field of ultra-high molecular weight polyethylene production, can solve the problems of difficult to break, unable to obtain spherical small particles, etc.

Active Publication Date: 2021-09-28
SABIC GLOBAL TECH BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Alternatively, one can produce such small particles by crushing or grinding particles with a larger average particle size, but due to the higher mechanical strength of UHMWPE particles, these powder particles are very difficult to break
In addition, this grinding process will not be able to obtain the desired spherical small particles

Method used

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  • Production method of ultra-high molecular weight polyethylene
  • Production method of ultra-high molecular weight polyethylene
  • Production method of ultra-high molecular weight polyethylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I

[0087] Contains Mg(OC 2 h 5 ) 2 and Ti(OC 4 h 9 ) 4 Preparation of the hydrocarbon solution

[0088] 92 g of granulated Mg(OC 2 h 5 ) 2 and 138 ml Ti(OC 4 h 9 ) 4 Add to a 2 L round bottom flask equipped with a reflux condenser and stirrer. With gentle stirring, the mixture was heated to 180°C and then stirred for 1.5 hours. During this time, a clear liquid was obtained. The mixture was cooled to 120°C, then diluted with 518 ml of hexane. The mixture was further cooled to 67°C as the hexanes were added. The mixture was kept at this temperature for 2 hours, then cooled to room temperature. The resulting clear solution was stored under nitrogen atmosphere and used as obtained. Analysis of the solution showed a titanium concentration of 0.55 mol / l.

Embodiment II

[0090] Contains Mg(OC 2 h 5 ) 2 and Ti(OC 8 h 17 ) 4 Preparation of the hydrocarbon solution

[0091] 112 g of granular Mg(OC 2 h 5 ) 2 and 200 ml Ti(OC 8 h 17 ) 4 Add to a 2 L round bottom flask equipped with a reflux condenser and stirrer. With gentle stirring, the mixture was heated to 180°C, followed by stirring for 2 hours. During this time, a clear liquid was obtained. The mixture was cooled to 120°C, then diluted with 1186 grams of hexane. The mixture was further cooled to 67°C as the hexanes were added. The mixture was kept at this temperature for 2 hours, then cooled to room temperature. The resulting clear solution was stored under nitrogen atmosphere and used as obtained. Analysis of the solution showed a titanium concentration of 0.34 mol / l.

Embodiment III

[0093] Catalyst preparation

[0094] In a 0.8 liter glass reactor equipped with baffles, reflux condenser and stirrer, 180 ml of hexane and 136 ml of the compound of example I (80 mmol Ti) were charged. Set the stirrer to 1400 RPM. Via a peristaltic pump, 250 ml of diisobutylaluminum chloride (DiBAC) solution (150 ml of DiBAC + 100 ml of hexane) was added over a period of 2 hours. The molar ratio of aluminum to titanium was 10.7. The mixture was then refluxed for 2 hours. After cooling to ambient temperature, the red / brown suspension obtained was washed 5 times with 500 ml of hexane by decantation. Finally, the solid was placed in 500 ml of hexane and the resulting slurry was stored under nitrogen atmosphere. The average particle size of the catalyst is 0.18 μm.

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Abstract

The present invention relates to a process for the production of ultra-high molecular weight polyethylene in the presence of a catalyst system comprising (I) and (II), wherein (I) is a solid reaction product obtained by the reaction of (a) and (b), a) is a hydrocarbon solution comprising 1) and 2) as follows: 1) an organic oxygen-containing magnesium compound or a halogen-containing magnesium compound, and 2) an organic oxygen-containing titanium compound; and b) is the general formula AlR a x (3‑a) Aluminum compounds, wherein R is a hydrocarbon group containing 3-10 carbon atoms, X is a halogen and 0 <a<3；和其中(ii)为通式alrThe aluminum compound of 3, wherein R is the hydrocarbyl group containing 1-10 carbon atoms; wherein the molar ratio of aluminum from (b) to titanium from (a) is greater than 3:1, and wherein the average particle size of the catalyst is 0.01- 1.0 μm, and the resulting polymer is in the form of spherical particles with an average particle size of less than 50 μm, or in the form of loosely bound aggregates composed of spherical submicron particles with an average particle size of less than 50 μm.

Description

technical field [0001] The present invention relates to a process for the production of ultra-high molecular weight polyethylene in the presence of a specific catalyst system. Background technique [0002] The catalytic production of polyethylene is well known in the art. A very special class of polyethylene is ultra-high molecular weight polyethylene (UHMWPE) with a very high average molecular weight of about 1,000,000 to well over 6,000,000 g / mol, while high-density polyethylene (HDPE) typically has a molecular weight of about 50000-300000g / mol. Therefore, the average molecular weight of these linear polymers is much higher than that of linear high density polyethylene. Synthesis of polymers to obtain UHMWPE is disclosed in Journal of Macromolecular Science Part C Polymer Reviews, Vol. C42, No 3, pp 355-371, 2002. The higher molecular weight gives UHMWPE a unique combination of properties that make it suitable for uses where lower molecular weight substances have been u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/02C08F4/655
CPCC08F110/02C08F2410/06C08F2500/01C08F2500/17C08F2500/24C08F4/6555
Inventor R·P·T·斯密茨N·H·弗来德里驰斯R·L·K·钱
Owner SABIC GLOBAL TECH BV
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