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Random copolymerization polypropylene, preparation method thereof, polypropylene cast film containing random copolymerization polypropylene and application of polypropylene cast film

A technology of polypropylene casting and random copolymerization, which is applied in the field of random copolymerization polypropylene and its preparation, and random copolymerization polypropylene cast film, which can solve the problems of poor quality, large gap and poor comprehensive performance of domestic products. problems, to achieve the effect of increasing melt flow rate, improving structure, and balancing rigidity and toughness

Pending Publication Date: 2021-03-09
刘城
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, a considerable part of domestic polypropylene CPP still relies on imports. The quality of domestic products is not good. In terms of toughness, low soluble precipitation, etc., the gap is even greater

Method used

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  • Random copolymerization polypropylene, preparation method thereof, polypropylene cast film containing random copolymerization polypropylene and application of polypropylene cast film

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] First, the present invention provides a method for preparing random copolymerized polypropylene, comprising the following steps:

[0028] Under the combined action of the main catalyst and the co-catalyst, S1 propylene undergoes a prepolymerization reaction in the prepolymerization reactor to obtain a propylene prepolymer;

[0029] The first polymerization reaction of S2 propylene prepolymer and fresh propylene, hexene and hydrogen occurs in the first loop reactor to obtain the first polymerization reaction product;

[0030] S3 the first polymerization reaction product and fresh propylene, hexene and hydrogen have the second polymerization reaction in the second loop reactor to obtain random copolymerized polypropylene;

[0031] The main catalyst is a metallocene catalyst, and the metallocene catalyst includes a carrier and a metallocene component supported on the carrier; the carrier includes silica gel, and the metallocene component includes zirconocene dichloride, me...

Embodiment 1

[0049] (1) Preparation of random copolymerized polypropylene

[0050] ① Under the combined action of the main catalyst and the co-catalyst, propylene undergoes a pre-polymerization reaction in a pre-polymerization reactor to obtain a pre-polymerization reaction product.

[0051] 2. The prepolymerization reaction product and fresh propylene, hexene and hydrogen enter the first loop reactor to continue the polymerization reaction to obtain the first polymerization reaction product. The hydrogen concentration of the first loop reactor is controlled to be 800 ppm, and the reaction temperature is 80 ° C , the reaction pressure is 4.5MPa, and the hexene / propylene is 0.4wt.

[0052]3. The first polymerization product and fresh propylene, hexene and hydrogen enter the second loop reactor and continue to polymerize to obtain the second polymerization product, and the hydrogen concentration of the control second loop reactor is 800ppm, and the reaction temperature is 80 ℃ , the reactio...

Embodiment 2

[0061] The difference between this embodiment and Embodiment 1 is that,

[0062] In the first polymerization reaction, the hydrogen concentration of the first loop reactor was 850 ppm, and the reaction pressure was 4.5 MPa; in the second polymerization reaction, the hydrogen concentration of the second loop reactor was 850 ppm, and the reaction pressure was 4.5 MPa.

[0063] The melt flow rate of the random copolymerized polypropylene obtained using the above-mentioned process parameters was 6.2 g / 10min.

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Abstract

The invention relates to the technical field of polymer synthesis, and discloses a preparation method of polypropylene random copolymer, which comprises the following steps: carrying out prepolymerization reaction on propylene in a prepolymerization reactor under the combined action of a main catalyst and a cocatalyst to obtain a propylene prepolymer; carrying out a first polymerization reaction on the propylene prepolymer, fresh propylene, hexene and hydrogen in a first loop reactor to obtain a first polymerization reaction product; and carrying out a second polymerization reaction on the first polymerization reaction product, fresh propylene, hexene and hydrogen in a second loop reactor to obtain polypropylene random copolymer, wherein the main catalyst is a metallocene catalyst. The invention also discloses a polypropylene random copolymer cast film and application thereof. According to the invention, the metallocene catalyst is adopted as the main catalyst, and the metallocene catalyst takes multi-element hybrid silica gel as a carrier, so that the selectivity of hexene is high, the copolymerization reaction activity of random copolymerization can be improved, and the uniform distribution of hexene in a polymer molecular chain can be improved.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, and in particular relates to a random copolymerized polypropylene and a preparation method thereof, a random copolymerized polypropylene cast film comprising the same, and applications thereof. Background technique [0002] Polypropylene is a thermoplastic resin obtained by polymerizing propylene. According to the arrangement position of methyl groups, it is divided into three types: isotactic polypropylene, atactic polypropylene and syndiotactic polypropylene. Among them, the methyl groups arranged on the same side of the molecular main chain are called isotactic polypropylene; the methyl groups arranged on both sides of the molecular main chain are called random polypropylene; the methyl groups are arranged alternately on both sides of the molecular main chain called syndiotactic polypropylene. Generally, in the polypropylene resin produced in industry, the content of isotactic poly...

Claims

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Application Information

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IPC IPC(8): C08F210/06C08F210/14C08F4/642C08F4/02C08L23/14C08J5/18
CPCC08F210/06C08J5/18C08J2323/14C08F210/14C08F4/6428C08F4/025Y02P20/52
Inventor 刘城
Owner 刘城
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