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Solid catalyst component and catalyst for olefin polymerization

A solid component, olefin polymerization technology, applied in the field of olefin polymerization, can solve the problems of low polymer melt flow rate melt index, poor sensitivity of molecular weight regulators, and insufficient polymer molecular weight distribution.

Active Publication Date: 2017-02-15
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1213080C discloses that the Z-N catalyst containing 1,3-diol ester internal electron donor has high activity and wide polymer molecular weight distribution, but the polymer molecular weight distribution it prepares is not wide enough, thereby limiting its application
EP990201172 and US60999436 disclose that the Z-N catalyst containing the electron donor in succinate has high activity, good stereospecificity, and the characteristics of wide molecular weight distribution of the obtained polymer, but the catalyst has a negative effect on the molecular weight regulator (hydrogen is the most commonly used molecular weight regulator). agent) sensitivity is not good, that is, at the same amount of hydrogen, the melt flow rate (MFR) (or melt index) of the polymer is low; and in order to meet the processing requirements of injection molding products, especially thin-walled parts, polymerization substances often require higher MFR

Method used

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  • Solid catalyst component and catalyst for olefin polymerization
  • Solid catalyst component and catalyst for olefin polymerization
  • Solid catalyst component and catalyst for olefin polymerization

Examples

Experimental program
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Effect test

preparation example Construction

[0081] Preparation of magnesium alkoxide

[0082] Alkoxy magnesium support (1)Mg(OEt) 2-m (OEHA) m Preparation of:

[0083] After fully replacing the 16L pressure-resistant reactor with agitator with nitrogen, add 10L ethanol, 300mL 2-ethylhexanol, 11.2g iodine, 8g magnesium chloride and 640g magnesium powder into the reactor. While stirring, the temperature of the system was raised to 75° C. for reflux reaction until no more hydrogen gas was discharged. Stop the reaction, wash with 3L ethanol, filter and dry. The obtained alkoxymagnesium support. The D50 of the obtained alkoxymagnesium carrier is 30.2um, the span value is 0.81, and the m value is 0.015.

[0084] Alkoxy magnesium support (2)Mg(OEt) 2 Preparation of:

[0085] The preparation method is the same as that of the alkoxymagnesium carrier a1, except that 300mL of 2-ethylhexanol is replaced by 300mL of ethanol. The D50 of the obtained alkoxymagnesium carrier was 37.3um, the span value was 1.51, and the m value ...

Embodiment 1

[0087] The preparation of catalyst solid component A1:

[0088] Take 10g of alkoxymagnesium compound (1), 50mL of toluene, 1.5mmol of diethyl 2,3-diisopropyl-2-cyanosuccinate (compound a, prepared with reference to the preparation method in CN101811983A) and 6.0mmol3, 5-heptanediol dibenzoate (compound b, prepared with reference to the preparation method in CN1213080C) was formulated into a suspension. In a 300mL reaction kettle that has been repeatedly replaced by high-purity nitrogen, add 40mL of toluene and 60mL of titanium tetrachloride, heat up to 80°C, then add the prepared suspension into the kettle, keep the temperature for 1 hour, slowly raise the temperature to 110°C, and keep the temperature constant After 2 hours, the solid was obtained by pressure filtration. The resulting solid was added to a mixture of 78 mL of toluene and 52 mL of titanium tetrachloride and stirred at 110° C. for 1 hour, and treated like this three times. Press-filtered, the obtained solid wa...

Embodiment 2-4、 comparative example 1-4

[0095] The preparation method and polymerization method of the catalyst solid components A2, A3, A4, B1, B2, B3, and B4 are the same as in Example 1, except that 2,3-diisopropyl-2-cyanosuccinate diethyl Amounts of ester (a) and 3,5-heptanediol dibenzoate (b). The solid components and compositions of the obtained catalysts are shown in Table 1.

[0096] The steps of the olefin polymerization reaction are the same as in Example 1, except that the catalyst solid components A2, A3, A4, B1, B2, B3, and B4 are used respectively. See Table 2 for the data.

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Abstract

The invention discloses a catalyst solid component for olefin polymerization, which is a reaction product of a magnesium compound, an internal electron donor compound a disclosed as Formula II, an internal electron donor compound b disclosed as Formula III and a titanium compound disclosed as general formula IV. The magnesium compound is alkoxy magnesium or alcoholate thereof disclosed as general formula I, the average particle diameter D50 is 20-100 mu m, and the dispersion index SPAN is less than 1.1. The mole ratio of the internal electron donor compound a to the internal electron donor compound b is 1:4-4:1. The solid catalyst component for olefin polymerization and catalyst have the advantages of high polymerization activity, favorable spatial orientation capacity, favorable hydrogen regulation sensitivity, wide polymer molecular weight distribution and low micropowder content when being used for olefin polymerization; and the polymer is free of phthalate. Mg(OEt)[2-m](OEHA)[m] (I). TiX[n](OR15)[4-n] (IV).

Description

technical field [0001] The invention belongs to the field of olefin polymerization, and in particular relates to a solid catalyst component and catalyst for olefin polymerization. Background technique [0002] At present, catalyst solid components based on magnesium, titanium and electron donors, known in the art as Ziegler-Natta (Z-N) catalysts, can be used for the polymerization of CH2=CHR olefins, especially those with 3 carbons or Polymers with higher yields and higher stereoregularity can be obtained in the polymerization of α-olefins with more carbon atoms. Various internal electron donors endow the corresponding polyolefin products with certain characteristics, but also have some disadvantages, thus limiting their applications. Researchers always hope to find a Z-N catalyst with better overall performance. [0003] Specifically, the widely used Z-N catalysts containing phthalate internal electron donors have high activity and good comprehensive properties of the res...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/00C08F4/649C08F4/646C08F110/06
Inventor 周奇龙谭忠徐秀东严立安谢伦嘉赵思源张锐田宇宋维玮李凤奎尹珊珊于金华
Owner CHINA PETROLEUM & CHEM CORP
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