High-melt-index polypropylene and preparation process thereof

Abstract

The invention discloses high-melt-index polypropylene and a preparation process thereof. The high-melt-index polypropylene is prepared from the following components in parts by weight: 73.3 to 88.58 parts of isotactic polypropylene, 0.8 to 2 parts of a plasticizer, 0.15 to 3 parts of an organic peroxide, 0.05 to 0.3 part of erucyl amide, 10 to 20 parts of polyethylene wax, 0.3 to 0.5 part of a polymerization inhibitor, 0.1 to 0.8 part of an antioxidant and 0.001 to 0.005 part of a stearate-binary acid compound. According to the invention, material components are selected and process steps andparameters are set, so that the raw materials are always changed in the degradation direction, the local bond breaking or cross-linking phenomenon caused by the unbalanced reaction of the raw materials is avoided, and the final finished product polypropylene has characteristics of uniform molecular weight, uniform molecular weight distribution, high fluidity and low melting temperature so as to achieve the high melt index, and is suitable for wide promotion and use.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a high melting index polypropylene and a preparation process thereof. Background technique [0002] Polypropylene is a polymer formed by the addition polymerization of propylene. Its normal state is a colorless, odorless, non-toxic, translucent solid. Polypropylene has excellent comprehensive properties and has been widely developed and applied in various fields. According to Different application scenarios have different requirements on the processing performance of polypropylene. For example, some production requires polypropylene to have good melt flow properties. This performance is based on the melt flow index, which is called melt flow index or melt flow index. Melt index, referred to as melt index, is the weight value of the thermoplastic melt passing through the standard capillary within ten minutes at a certain temperature and pressure, expressed in (g / 10min), and used t...

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Problems solved by technology

[0002] Polypropylene is a polymer formed by the addition polymerization of propylene. Its normal state is a colorless, odorless, non-toxic, translucent solid. Polypropylene has excellent comprehensive properties and has been widely developed and applied in various fields. According to Different application scenarios have different requirements on the processing performance of polypropylene. For example, some production requires polypropylene to have good melt flow properties. This performance is based on the melt flow index, which is called melt flow index or melt flow index. Melt index, referred to as melt index, is the weight value of the thermoplastic melt passing through the standard capillary within ten minutes at a certain temperature and pressure, expressed in (g / 10min), and used to indicate the fluidity of plastic materials during processing. , the melt index is an important index to characterize the processability of materials in polymer processing. It is often used in industry to represent the relative value of melt viscosity. The existing high-melt index polypropylene is generally controlled by polymerization. Molecular weight and molecular weight distribution, or to degrade conventionally obtained polypropylene to achieve its high melting point, and organic peroxides are commonly used for degradation, but in the process of polypropylene degradation, it may be due to uneven dispersion of organic peroxides, Insufficient reaction, interference of other components and other factors cause partial degradation or partial crosslinking of polypropylene

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