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A kind of dispersant for polyolefin catalyst

A dispersant and catalyst technology, applied in the field of dispersant for polyolefin catalysts, to achieve good high temperature stability, good viscosity performance and dispersibility, and facilitate the smooth operation of polymerization

Active Publication Date: 2020-09-15
利和知信新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the use of polyalphaolefin synthetic oil as the main component of Ziegler-Natta catalyst dispersants

Method used

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  • A kind of dispersant for polyolefin catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The dispersant of olefin polymerization catalyst in the present embodiment is made of following components:

[0051] (1) The mass percentage of PAO10 is 95%;

[0052] (2) The mass percentage of PB400 is 5%.

[0053] Solvent properties: kinematic viscosity (40°C): 69.2mm 2 / s; pour point: -51℃; water content <30μg / g, non-volatile matter <0.001g / 100mL, benzene content <50μg / g, sulfur content <100μg / g.

[0054] After testing, 1.68% of hexane leachables in polypropylene products.

Embodiment 2～15

[0056] Please refer to Table 1 for the components of the dispersant of the olefin polymerization catalyst in Examples 2-15 and their respective contents, solvent properties, and contents of hexane leached matter in polypropylene products.

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Abstract

The invention relates to a dispersing agent for a polyolefin catalyst. The dispersing agent is composed of the following materials by weight percent: 60%-99.9% of poly alpha-olefin synthetic oil withkinematic viscosity not above 100mm2 / s at 40 DEG C and 0.1%-40% of polyisobutene. Due to the viscosity and dispersity of the dispersing agent disclosed by the invention, the prepared catalyst suspension is not easy to settle under the conditions of storage, transportation and polymerization process; compared with the mineral oil with same viscosity, the dispersing agent has lower flow point and better and more stable operation; poly alpha-olefin has high compatibility with polypropylene and is not easy to volatile; fuming phenomenon of polymer during the processing process is greatly reduced;the content of soluble substance in hexane is low; the dispersing agent is suitable for the production of packaging products of medical supplies and food and the production of aluminum laminated films.

Description

technical field [0001] The invention belongs to the technical field of polyolefin production, in particular to a dispersant for polyolefin catalysts. Background technique [0002] The catalysts used in the homopolymerization and copolymerization of polyolefins (such as polyethylene and polypropylene, etc.) are mainly Ziegler-Natta supported catalysts. Polyolefin manufacturers generally use inert solvents (inert organic solvents, hydrocarbon oils, hydrocarbon esters, etc.) as dispersants to mix solid catalysts to prepare catalyst suspensions according to the process formula, and add them to the pipelines and reactors of the polymerization device for polymerization. [0003] Since the catalyst suspension is a heterogeneous system, the supported catalyst easily forms a concentration gradient in the vertical direction under the action of gravity, which leads to changes in the concentration of the catalyst when the catalyst is running in the pipeline and reactor of the polymeriza...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F110/06C08F2/44
CPCC08F2/44C08F110/06
Inventor 王志武李树行马庆利代金松张鹏飞王敬禹李华姝张军伟
Owner 利和知信新材料技术有限公司
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