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Polypropylene stereo-tacticity conditioning agent and application thereof

A technology of stereoregularity and regulator, which is applied in the field of catalytic system components for changing the stereoregularity of polypropylene, can solve the problems of a large amount of external electron donors and a narrow adjustment range of the stereoregularity, and achieves a grade of Easy to switch and easy to implement effects

Inactive Publication Date: 2016-02-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can effectively control the tacticity of polypropylene within a certain range. However, since the silane and ether external electron donors are all high stereoregular external electron donors, and the ether external electron donors The complexing ability is stronger than that of silanes. Therefore, there are disadvantages of silanes with a large amount of external electron donors and a narrow range of tacticity adjustment.
No report on adjusting the tacticity of polypropylene with a composite external electron donor composed of organosilicon compound and organic amine compound has not been seen in the published literature

Method used

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  • Polypropylene stereo-tacticity conditioning agent and application thereof
  • Polypropylene stereo-tacticity conditioning agent and application thereof
  • Polypropylene stereo-tacticity conditioning agent and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The polymerization reaction of propylene was carried out in a 5L polymerization tank reactor with magnetic stirring. First, the reactor was replaced three times with nitrogen, and 1.0mmol cocatalyst triethylaluminum, 0.2mmol tacticity regulator [2 Cyclopentyldimethoxysilane (DONOR-D) / 2,2,6,6-tetramethylpiperidine (TMPIP)=5 / 95 (mol / mol)] and 12-14mgBCK catalyst (Sinopec Catalyst Company Beijing Provided by Aoda Branch, the mass content of Ti element is 2.0%, and the mass content of Mg element is 18%. For the specific preparation method, refer to the patent document CN101993506B), carry out pre-complexation reaction at room temperature for two minutes in the catalyst feeding tube, and then add the catalyst mixed solution Into the reaction kettle, add 0.08MPa hydrogen (partial pressure in the reactor of the polymerization kettle), add 2.2L of propylene monomer into the 5L polymerization kettle, start stirring, heat up to 70±2°C, react for 1 hour, and end the reaction. Evac...

Embodiment 2

[0038] The catalyst used in embodiment 2, polymerization condition are identical with embodiment 1. The difference from Example 1 is that the ratio of component A (DONOR-D) and component B (TMPIP) in the tacticity modifier is adjusted to 15 / 85 (mol / mol), and the obtained polypropylene analysis result And the physical properties of the polypropylene are shown in Table 1.

Embodiment 3

[0040] The catalyst used in embodiment 3, polymerization condition are identical with embodiment 1. The difference from Example 1 is that the ratio of component A (DONOR-D) and component B (TMPIP) in the tacticity modifier is adjusted to 25 / 75 (mol / mol), and the obtained polypropylene analysis result And the physical properties of the polypropylene are shown in Table 1.

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Abstract

The invention discloses a polypropylene stereo-tacticity conditioning agent. The conditioning agent comprises a component A which is an organic silicon compound with a general formula being R<1>R<2>Si(OR<3>)2, in the formula, R<1> and R<2> are same or different, are respectively and independently selected from C1-C6 straight chain or branched or cyclic aliphatic groups, R<3> is selected from C1-C3 straight chain aliphatic group; the polypropylene stereo-tacticity conditioning agent also comprises a component B which is selected from at least one of the organic aminated compounds in the general formulas (I)-(VI), R1-R60 in the formula are same or different, and are respectively and independently selected from hydrogen atoms or straight chain aliphatic groups or branched or the cyclic aliphatic groups. The invention also provides an application of the stereo-tacticity conditioning agent in a preparation method of polypropylene, and polypropylene with a controllable isotactic index in a large scope can be obtained by the application.

Description

technical field [0001] The invention relates to a polypropylene tacticity regulator and its application, more specifically, to a catalyst system component for changing the polypropylene tacticity and its application. Background technique [0002] Isotactic polypropylene (iPP) is a semi-crystalline polymer that is widely used as a synthetic polymer material. The properties of polypropylene such as mechanical properties, crystallization behavior, electrical insulation, chemical resistance, thermal properties, rigidity, hardness, transparency and modulus are closely related to its tacticity. The higher the tacticity of polypropylene (called isotactic index or isotacticity in the industry), the higher its tensile strength, density, rigidity, modulus, heat distortion temperature, and chemical corrosion resistance, while the lower Regular index polypropylene has low density, good toughness, softness at low temperature, low heat sealing temperature, and easy processing. Polypropy...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F4/649
Inventor 毕福勇宋文波魏文骏胡慧杰陈操张晓萌邹发生邵清
Owner CHINA PETROLEUM & CHEM CORP
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