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A kind of preparation method of impact-resistant polypropylene

A technology of polypropylene and propylene, which is applied in the field of preparation of impact polypropylene, and can solve the problems of high cost of equipment modification, high energy consumption, and low efficiency

Active Publication Date: 2018-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the disadvantages of low efficiency of recirculating gas heat exchanger, decreased device production capacity, high energy consumption and high cost of device transformation caused by the high concentration of non-condensable gas in the copolymerization stage when the prior art is preparing impact polypropylene with high ethylene content, the present invention The purpose is to provide a preparation method of impact polypropylene, which can regulate the reactivity rate of ethylene through an external electron donor, so as to ensure the heat exchange capacity of the recirculating gas heat exchanger, reduce energy consumption, and obtain Impact polypropylene with high ethylene content

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example

[0081] This preparation example is used to prepare the titanium-containing solid catalyst component in the catalyst.

[0082] 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 system was refluxed until no more hydrogen was released. The reaction was stopped, and the product was washed with 3L of ethanol, filtered, and dried to obtain a dialkoxymagnesium carrier. The dialkoxymagnesium carrier D50=30.2um, Span=0.81, m=0.015. Take 650 g of the above-mentioned dialkoxymagnesium carrier and 3250 mL of toluene to prepare a suspension. In a 16L pressure-resistant reactor that has been repeatedly replaced by high-purity nitrogen, add 2600 mL of toluene and 3900 mL of titanium tetrachloride, raise the temperature to 80 ° C, then add the prepared suspension to the kettle, keep the temperature for 1 hour, and add ...

Embodiment 1

[0084] This example is used to illustrate that in the method for preparing impact polypropylene with high ethylene content, the use of external electron donor T-Donor can increase the reactivity ratio of ethylene.

[0085] 1) Raw material

[0086] The titanium-containing solid catalyst component obtained in the preparation example is a main catalyst; Triethylaluminum is used as a cocatalyst; Dicyclopentyldimethoxysilane (D-Donor) is used as the first external electron donor; Tetraethylaluminum Oxysilane (T-Donor) is used as the second external electron donor; propylene, ethylene and hydrogen are of polymerization grade, which are used after removing water and oxygen, and hexane is used after being dehydrated.

[0087] 2) Test device

[0088] A polymerization process in which two horizontal tank gas phase reactors are connected in series is adopted, and the two horizontal tank gas phase reactors have the same structure and are respectively used as the first gas phase reactor a...

Embodiment 2

[0098] This example is used to illustrate that in the method for preparing impact polypropylene with high ethylene content, the load of cooling / condensing equipment can be reduced by adopting gas-phase multi-temperature zone technology.

[0099] 1) raw material, with embodiment 1.

[0100] 2) Test device, same as embodiment 1.

[0101] Among them, the second gas-phase horizontal reactor adopts gas-phase multi-temperature zone polymerization technology, such as figure 2 As shown: the first gas phase reaction zone 12 and the second gas phase reaction zone 13 are horizontally divided along the direction of the horizontal stirring shaft 2 of the horizontal tank, and different reaction zones have different reaction temperatures. The temperature of each reaction zone is independently adjusted by changing the flow rate of the quenching liquid sprayed in this zone or the size of the quenching liquid / circulation flow.

[0102] After the polymer powder and other streams are discharged ...

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Abstract

The invention relates to a preparation method for anti-impact polypropylene. The anti-impact polypropylene is prepared from propylene and ethylene through polymerization in the presence of a Ziegler-Natta catalyst, and the preparation method comprises the following concrete steps: carrying out propylene homopolymerization in the presence of a solid catalyst component containing titanium, an aluminum alkyl compound and a first external electron donor; then adding a second external electron donor; and carrying out copolymerization of propylene and ethylene. The first external electron donor and the second external electron donor are selected from organosilicon compounds as shown in a general formula R'R''<q>Si(OR'' ')<4-p-q>, p+q of the first external electron donor is an integer in a range of 2 to 3, and p+q of the second external electron donor is an integer in a range of 0 to 1. The method provided by the invention can improve the reactivity ratio of ethylene; and in particular, through arrangement of a high temperature polymerization area during ethylene-propylene copolymerization, heat removing capability of a circulation gas heat exchanger can be improved, and running load of a condensation / cooling device can be reduced.

Description

technical field [0001] The invention relates to a method for preparing impact-resistant polypropylene, in particular to a method for preparing impact-resistant polypropylene with high ethylene content, and belongs to the technical field of polypropylene production. Background technique [0002] In general, products with high ethylene content can be considered as products with high ethylene content if the ethylene content reaches the upper limit of the production capacity of the polymerization process or exceeds the value that can be achieved by the existing technology. Among them, impact polypropylene with high ethylene content has both the rigidity of propylene homopolymer and the impact resistance of ethylene-propylene rubber components, and has a good balance of rigidity and toughness. It has been widely used in automobiles, household appliances and injection-molded containers, etc. field. [0003] Polypropylene with a high ethylene content is usually produced using a mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/16C08F110/06C08F4/654C08F4/651C08F4/646
Inventor 杨芝超刘旸陈江波杜亚锋仝钦宇张雅茹
Owner CHINA PETROLEUM & CHEM CORP
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