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A kind of preparation method of propylene homopolymer

A technology of homopolymer and propylene, which is applied in the field of preparation of propylene homopolymer, can solve the problems of lower rigidity of final product, influence on production load of equipment, lower catalyst activity, etc.

Active Publication Date: 2019-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the pressure design of the production equipment, the addition of a large amount of hydrogen is limited, as is the case in the current liquid-phase bulk process
The obvious disadvantages of adding a large amount of hydrogen are: the catalyst activity is greatly reduced; the isotacticity of the polymer is reduced, so that the rigidity of the final product is reduced; The heat transfer effect of the heat exchanger becomes poor, which directly affects the production load of the device, thereby reducing the production capacity
However, when the traditional Ziggler-Natta catalyst is used at a higher polymerization temperature, such as above 90 ° C, the activity of the catalyst is significantly reduced, and it is difficult to be used in industrial production
[0006] At present, it is very difficult to obtain propylene homopolymer with high melt flow rate and narrow molecular weight distribution by direct polymerization

Method used

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  • A kind of preparation method of propylene homopolymer
  • A kind of preparation method of propylene homopolymer
  • A kind of preparation method of propylene homopolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] 1) Raw material (same as comparative example 1)

[0077] 2) Test device (same as comparative example 1)

[0078] 3) Test conditions

[0079] Step (1) pre-polymerization: the reaction pressure is 2.5 MPa, reaction temperature 10℃ ,Reaction time 12 Minutes; catalyst, triethylaluminum, dicyclopentyldimethoxysilane (DCPDMS) feed amount respectively 0.6g / Hour, 0.048 Mole / hour (8ml / h), 0.0078 Mole / hour (2.7ml / h); Al / Si (mol / mol)=6.11; Propylene feed rate is 10 kg / h

[0080] Step (2) gas phase polymerization: reaction temperature 91 °C, the reaction pressure is 2.3 MPa, reaction time 60 minutes; the feed amount of propylene is 30 kg / hour; the hydrogen feed rate is 1.5 g / hour; the hydrogen / propylene molar ratio in the reaction gas phase is 0.03.

[0081] 4) Test results

[0082] The continuous test was carried out for 48 hours according to the above conditions, and the operation of the device was stable. The polymer obtained by the reaction was analyzed and tested...

Embodiment 2

[0084] 1) Raw material (same as comparative example 1)

[0085] 2) Test device (same as comparative example 1)

[0086] 3) Test conditions

[0087] Step (1) pre-polymerization: the reaction pressure is 2.5 MPa, reaction temperature 10℃ ,Reaction time 12 Minutes; catalyst, triethylaluminum, dicyclopentyldimethoxysilane (DCPDMS) feed amount respectively 0.6g / Hour, 0.048 Mole / hour (8ml / h), 0.0078 Mole / hour (2.7ml / h); Al / Si (mol / mol)=6.11; Propylene feed rate is 10 kg / h

[0088] Step (2) gas phase polymerization: reaction temperature 98 °C, the reaction pressure is 2.3 MPa, reaction time 60 minutes; the feed amount of propylene is 30 kg / hour; the hydrogen feed rate is 1.5 g / hour; the hydrogen / propylene molar ratio in the reaction gas phase is 0.03.

[0089] 4) Test results

[0090] According to the above conditions, a 48-hour continuous test was carried out, and the operation of the device was stable. The polymer obtained by the reaction was analyzed and tested, and ...

Embodiment 3

[0092] 1) Raw material (same as comparative example 1)

[0093] 2) Test device (same as comparative example 1)

[0094] 3) Test conditions

[0095] Step (1) pre-polymerization: the reaction pressure is 2.5 MPa, reaction temperature 10℃ ,Reaction time 12 Minutes; catalyst, triethylaluminum, dicyclopentyldimethoxysilane (DCPDMS) feed amount respectively 0.6g / Hour,0.048 Mole / hour (8ml / h), 0.0078 Mole / hour (2.7ml / h); Al / Si (mol / mol)=6.11; Propylene feed rate is 10 kg / h

[0096] Step (2) gas phase polymerization: reaction temperature 108 °C, the reaction pressure is 2.3 MPa, reaction time 60 minutes; the feed amount of propylene is 30 kg / hour; the hydrogen feed rate is 1.5 g / hour; the hydrogen / propylene molar ratio in the reaction gas phase is 0.03.

[0097] 4) Test results

[0098] The continuous test was carried out for 48 hours according to the above conditions, and the operation of the device was stable. The polymer obtained by the reaction was analyzed and tested,...

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Abstract

The invention provides a preparation method of a propylene homopolymer. The preparation method comprises that in the presence of a certain catalyst composition and a small amount of a molecular weight conditioning agent, at a high polymerization temperature, the propylene homopolymer product having a high melt flow rate and narrow molecular weight distribution is produced.

Description

technical field [0001] The present invention relates to a preparation method of propylene homopolymer, more specifically, relates to a preparation method of propylene homopolymer with higher melt flow rate and narrower molecular weight distribution. technical background [0002] The molecular weight of polypropylene and its molecular weight distribution width (Mw / Mn) is an important polymer structure parameter, which directly affects the processing behavior and mechanical properties of polypropylene. Polypropylene with a narrow molecular weight distribution has a wider Newtonian plateau area during the flow process, and its viscosity changes less with shear rate fluctuations, and the extrusion volume is easier to control stably. It is especially suitable for molding that requires low viscosity and high fluidity. method. For example, in spinning and other applications, it is necessary to control the molecular weight distribution of polypropylene to a narrow distribution to i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F10/06C08F110/06C08F2/38C08F4/649C08F4/646C08F2/02C08F2/34
Inventor 于鲁强杨芝超陈江波杜亚锋仝钦宇刘旸
Owner CHINA PETROLEUM & CHEM CORP
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