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Single metallocene compound and application thereof

A single metallocene compound technology, applied in the single metallocene compound and its application field, can solve the problem of low molecular weight of polymers, achieve good technical effect, broad application prospects, and suitable catalytic activity

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Do et al. used the monotitanocene shown in formula (13) as a catalyst for the syndiotactic polymerization of styrene, and found that its polymerization activity was relatively high, but the molecular weight of the polymer was relatively low (Organometallics 1999, 18, 36; Organometallics 2002, 21, 1127)

Method used

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  • Single metallocene compound and application thereof
  • Single metallocene compound and application thereof
  • Single metallocene compound and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The polymerization of styrene is catalyzed by pentamethylcyclopentadienyl-methoxytitanium coordinated by 2-(hydroxyl, diphenyl-methyl)phenol as the main catalyst: the dry polymerization bottle is vacuumed and rinsed with nitrogen repeatedly three times ; at a polymerization temperature of 70°C, add 9.0 milliliters of toluene, 7.0 milliliters of styrene, 3.0 milliliters of MAO toluene solution (concentration of 1.67 mmol / ml) and 2-(hydroxyl, diphenyl-methyl) phenol-coordinated pentamethyl Cyclopentadienyl-methoxytitanium catalyst toluene solution (concentration is 0.5x10 -5 mol / ml) 1.0ml (Ti:Al is 1:1000), start timing. After 20 minutes of polymerization time, carefully pour the reaction solution into a beaker, add acidified ethanol, stir for more than 6 hours, filter to obtain the polymer, and vacuum-dry the filter cake at 60°C for 24 hours, weigh to obtain 0.16 g of the polymer; Reflux in boiling butanone for 2 hours, filter while hot to obtain a solid polymer, and va...

Embodiment 2

[0047] Toluene 6.0 ml, MAO toluene solution 6.0 ml (Ti:Al 1:2000). All the other steps are the same as in Example 1. 0.16 g of polymer was obtained; 0.15 g of SPS polymer was obtained. Polymer weight average molecular weight Mw=14.91x10 4 , molecular weight distribution MWD=3.15. The data are shown in Table 1.

Embodiment 3

[0049] 6.0 ml of toluene, 6.0 ml of MAO toluene solution (Ti:Al ratio of 1:2000), polymerization temperature of 90°C, and other steps are the same as in Example 1. 0.97 g of polymer was obtained; 0.94 g of SPS polymer was obtained. Polymer weight average molecular weight Mw=14.86x10 4 , molecular weight distribution MWD=3.15. The data are shown in Table 1.

[0050] Table 1

[0051]

[0052]

[0053] As can be known from the table, utilize the novel single metallocene compound provided by the invention to be used for preparing polyolefin, especially prepare syndiotactic polystyrene, have suitable catalytic activity, the proportion of SPS is high in the polymkeric substance, has obtained Better technical effect.

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Abstract

The invention discloses a single metallocene compound, whose structure is shown in the formula I, wherein, X is selected from halogen atom, alkyl, alkyloxy and aryloxy; Cp' is selected from cyclopentadienyl without substituent group or with substituent group alkyl, indenyl without substituent group or with substituent group alkyl, and fluorenyl without substituent group or with substituent group alkyl. The single metallocene compound provided by the invention can be used for preparing polyolefin, especially preparing syndiotactic polystyrene with appropriate catalytic activity, and SPS in the polymer has a high proportion, thereby the compound has a wide application prospect.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a single metallocene compound and an application thereof. Background technique [0002] Metallocene catalysts for olefin polymerization have been a research hotspot in organometallic chemistry, catalytic chemistry, polymer chemistry and materials science in recent decades. Using metallocene catalysts, olefin polymers with uniform molecular weight distribution and chemical composition distribution can be obtained; at the same time, the molecular structure and molecular weight of the polymer can be highly controllable by adjusting the catalyst structure; in addition, by using metallocene catalysts, it is also possible Olefin polymers that cannot be obtained with traditional Ziegler-Natta catalysts are obtained. [0003] Styrenic polymers can be classified into atactic polystyrene, isotactic polystyrene, and syndiotactic polystyrene. Syndiotactic polystyrene (SPS) is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F17/00C08F12/08C08F4/6592
Inventor 王伟郑刚王洪涛
Owner CHINA PETROLEUM & CHEM CORP
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