Multi-phase copolymer polypropylene in-reactor alloy and preparation method thereof

A technology of in-kettle alloy and polypropylene, which is applied in the field of heterogeneous copolymer polypropylene in-kettle alloy and its preparation, can solve the problems of inability to adjust the molecular structure diversity of the rubber phase, poor catalytic copolymerization ability, and very limited control of material properties, etc. question

Inactive Publication Date: 2011-09-07
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, multi-stage reactor technology usually initiates polymerization by a single catalytic system, and the same catalyst plays a catalytic role in each stage of reactor, so that it is impossible to achieve optimal conditions in each stage of reactor, especially in a wide range of reactors. The titanium-based catalyst (Ziegler-Natta catalyst) used for polypropylene synthesis has

Method used

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  • Multi-phase copolymer polypropylene in-reactor alloy and preparation method thereof
  • Multi-phase copolymer polypropylene in-reactor alloy and preparation method thereof
  • Multi-phase copolymer polypropylene in-reactor alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] (1) Propylene polymerization

[0050] Add 2Kg propylene in a 10L polymerization reactor, and add 0.076g of external electron donor diphenyldimethoxysilane (DDS) successively at 20°C (the amount of this external electron donor is 2% of the molar amount of metal Ti element in the catalyst. 13 times), cocatalyst triethylaluminum (TEA) 0.58g (the addition of this cocatalyst is based on the mol ratio of Al and metal Ti in the catalyzer, is Al: Ti=212), Ziegler-Natta / metallocene composite catalyst A 0.05g, 0.3g of hydrogen gas was passed through, the temperature was raised to 75°C, and the pressure was 3.2MPa to react for 60min, and the obtained polypropylene was directly subjected to the next step of reaction.

[0051] (2) Ethylene / propylene copolymerization

[0052] Vent the remaining propylene in the reaction kettle in step 1 and lower the temperature to 50°C, then feed a mixture of 100g ethylene and 350g propylene, and 0.05g hydrogen, raise the temperature to 80°C, and r...

Embodiment 2

[0054] (1) Propylene polymerization

[0055] Add 2Kg of propylene into a 10L polymerization reactor, add 0.05g of Ziegler-Natta / metallocene composite catalyst B at 20°C, pass in 0.25g of hydrogen, raise the temperature to 70°C, and react for 60min under a pressure of 3MPa, and the obtained polypropylene is directly proceed to the next reaction.

[0056] (2) Ethylene / propylene copolymerization

[0057] In step 1), the residual propylene in the reactor was vented and cooled to 50°C, then a mixture of 100g ethylene and 350g propylene was introduced, 0.05g hydrogen was introduced, the temperature was raised to 80°C, and the pressure was 2.5MPa to react for 30 minutes to obtain The polypropylene kettle alloy is 1.12Kg, and the composition and properties of the product are shown in Table 1, wherein, as one of the components, the average isotacticity of xylene solubles above 110°C (that is, propylene polymer) is 95%.

Embodiment 3

[0059] (1) Homopolymerization of propylene

[0060] In a 10L polymerization reactor, add 2Kg propylene, and add cocatalyst triethylaluminum (TEA) 0.36g successively at 20°C (the addition amount of the cocatalyst is based on the molar ratio of Al to metal Ti in the catalyst, which is Al:Ti =109), Ziegler-Natta / metallocene composite catalyst C 0.05g, the temperature was raised to 75°C, and the pressure was 3.0MPa to react for 45min, and the obtained polypropylene was directly subjected to the next reaction.

[0061] (2) Ethylene / propylene copolymerization

[0062] Vent the remaining propylene in the reaction kettle in step 1) and lower the temperature to 50°C, then introduce a mixture of 150g ethylene and 300g propylene, raise the temperature to 90°C, and react for 30min at a pressure of 2.3MPa to finally obtain a polypropylene kettle alloy 1.03 Kg, the composition and properties of the product are shown in Table 1, wherein, as one of the components, the average isotacticity of...

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Abstract

The invention discloses a multi-phase copolymer polypropylene in-reactor alloy and a preparation method thereof. In the method, a compound catalyst which is prepared by combining a Ziegler-Natta catalyst and a metallocene catalyst is adopted; propylene polymerization and ethylene/alpha-olefin copolymerization which are sequentially performed are catalyzed by the components of the two catalysts together; thus a polypropylene resin phase which is mainly prepared under the action of the Ziegler-Natta catalyst is uniformly mixed with an ethylene/alpha-olefin random copolymer rubber phase which is mainly prepared under the action of the metallocene catalyst in a polymerizer; and in the method, the ethylene/alpha-olefin block copolymer which is generated under the action of the Ziegler-Natta catalyst can be utilized as a compatilizer between the resin phase and the rubber phase, so that dispersion stability of the two phases (the resin phase and the rubber phase) is guaranteed, and balance between rigidity and toughness of the material is effectively realized.

Description

technical field [0001] The invention relates to a heterogeneous copolymer polypropylene kettle alloy and a preparation method thereof. Background technique [0002] Polypropylene, as one of the most widely used synthetic polymer materials, has developed rapidly since its industrialization in the 1950s. Its products have been widely used in the fields of automobiles, construction, home appliances, packaging and agriculture. Polypropylene alloy is a mixture of polypropylene and other olefin polymers (mostly a mixture of polypropylene and ethylene / α-olefin random copolymer). Because it has better low-temperature toughness than ordinary polypropylene, it is used as a high-impact The material has a wide range of applications in fields such as automobile manufacturing, home appliances, construction and packaging. The traditional preparation method of polypropylene alloy is the melt blending method, that is, the mechanical mixing of polypropylene and ethylene / α-olefin random copol...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/16C08L23/14C08L23/08C08L23/06C08F110/06C08F210/16C08F4/6592
Inventor 董金勇逯丽牛慧
Owner INST OF CHEM CHINESE ACAD OF SCI
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