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Preparation method of polypropylene wax

A polypropylene wax and propylene technology, applied in the production of bulk chemicals, etc., can solve the problems of high polymer melt viscosity, no value, and difficult to achieve, and achieve uniform particles, reduce solvent usage, and improve the effect of shape.

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent application CN98115939.7 discloses a method for preparing polypropylene wax using an ethylene bridging metallocene compound as a catalyst. In this method, the catalyst component is added into liquid propylene in the form of a solution for reaction, and the polypropylene wax product is Discharge in the form of melt, because the melting point of polypropylene wax is much higher than the polymerization temperature, and the viscosity of polymer melt is very high, this method is difficult to realize in actual production, and has no practical application value

Method used

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  • Preparation method of polypropylene wax
  • Preparation method of polypropylene wax
  • Preparation method of polypropylene wax

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Embodiment 1: Preparation of supported metallocene catalyst

[0052] Carrier treatment: under dry nitrogen flow, the silica gel was heat-treated at 600°C for 6 hours, and nitrogen protection was used for later use. Weigh 5.0 g of the treated silica gel, add it into a stirred glass reaction bottle, vacuumize, stir slowly and heat to 100° C. for 5 hours. Then nitrogen protection was introduced into the reaction bottle.

[0053] Loading methylaluminoxane: under the protection of nitrogen, add 5.0g methylaluminoxane and 20mL toluene to the reaction flask with mechanical stirring, stir to dissolve and keep the temperature to 100°C, then slowly add the above-mentioned treated silica gel into the methylaluminoxane solution, rinse the residual silica gel with 20 mL of toluene, stir at constant temperature for 3 hours, then wash with toluene at 100° C., filter, and dry to obtain a silica gel carrier loaded with methylaluminoxane.

[0054] Loaded metallocene compound: under the...

Embodiment 2

[0055] Embodiment 2: Propylene bulk polymerization reaction

[0056] Polymerization was carried out in a 5 L autoclave. The polymerization kettle was first purged and replaced with dry nitrogen, and 220 mg of the supported metallocene catalyst prepared in Example 1 was suspended in 5 ml of n-hexane to make a slurry and added to the catalyst feeder, followed by the addition of 3.5 ml of 1 mol / L triisobutyl Start stirring the aluminum hexane solution, pour the catalyst and triisobutylaluminum into the reactor with 2.3 L of liquid propylene, raise the temperature to 70° C. and react for 1 hour to obtain 767 g of powdered polypropylene wax. The polymerization activity was 3486 g / gcat·hr, the number average molecular weight of the obtained polypropylene wax was 16500 g / mol, and the molecular weight distribution was 2.35.

Embodiment 3

[0057] Embodiment 3: Propylene bulk polymerization reaction

[0058] Polymerization was carried out in a 5 L autoclave. The polymerization kettle was first purged and replaced with dry nitrogen, and then 0.1MPa hydrogen was introduced. Suspend 205 mg of the supported metallocene catalyst prepared in Example 1 in 5 ml of n-hexane to make a slurry and add it to the catalyst feeder, then add 3.5 ml of triisobutylaluminum hexane solution with a concentration of 1 mol / L, start stirring, and use 2.3 L of liquid propylene flushed the catalyst and triisobutylaluminum into the reactor, raised the temperature to 70° C. and reacted for 1 hour to obtain 315 g of powdered polypropylene wax. The polymerization activity was 1536 g / gcat·hr, the number average molecular weight of the obtained polypropylene wax was 2300 g / mol, and the molecular weight distribution was 2.59.

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Abstract

The invention relates to a preparation method of polypropylene wax. The method is characterized in that a liquid phase bulk polymerization technology is used, a supported metallocene catalyst is used, hydrogen is adopted as a molecular weight regulator, and a granular polypropylene wax product is directly obtained through catalyzing liquid propylene polymerization. The propylene polymerization reaction activity is not lower than 1000 times / h. The method has the characteristics of simple operation and high polymerization reaction activity, and the molecular weight of the polypropylene wax product obtained in the invention is adjustable and has narrow distribution.

Description

technical field [0001] The invention belongs to the technical field of polyolefin preparation and olefin polymerization catalysts, and relates to a preparation method of polypropylene wax. Background technique [0002] Polypropylene wax is a low-molecular-weight polypropylene that has a wide range of uses in industry, such as pigment dispersants, plastic additives, ink additives, paper processing aids, hot melt adhesives, rubber processing aids, and paraffin wax modifiers. [0003] Yang Ruihua et al. pointed out in the "Progress in the Application and Preparation Technology of Polypropylene Wax" disclosed in "Hebei Chemical Industry" No. 1, 1997, pages 49-51, that the main production methods of polypropylene wax include direct polymerization of propylene, high molecular weight PP There are three types of separation and purification of low molecular weight by-products during degradation and high molecular weight PP polymerization. Due to the advancement of polypropylene cata...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F4/6592C08F4/02
CPCY02P20/52
Inventor 范国强胡青郑刚
Owner CHINA PETROLEUM & CHEM CORP
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