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Preparation method of propylene-alpha-olefin random copolymer

A technology of random copolymer and propylene, which is applied in the field of propylene random copolymer and its preparation and application, can solve the problems of low heat sealing performance, increased deposits, and decreased high temperature resistance, and achieves good film-forming processing performance, and can be The effect of low content of dissolved substances and good heat sealing performance

Inactive Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, adding a large amount of ethylene, while meeting the requirements of low heat sealing performance, its high temperature resistance performance also decreases, so it cannot meet the requirements of high temperature cooking.
Moreover, the addition of a large amount of ethylene will increase the soluble content in the resin, which limits the application of the film in the food and hygiene fields, and will also affect the fastness and transparency of the metal coating over time; This will cause an increase in deposits on the cooling and conveying rollers during film processing, which not only affects the surface finish and optical properties of the film, but also causes parking and cleaning, affecting the continuity of processing
[0005] So far, there have been no related reports on the use of propylene-α-olefin random copolymers in the manufacture of high-temperature cooking CPP films and patents

Method used

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  • Preparation method of propylene-alpha-olefin random copolymer
  • Preparation method of propylene-alpha-olefin random copolymer
  • Preparation method of propylene-alpha-olefin random copolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The polymerization reaction was carried out on a set of pilot plant. Its main equipment includes a prepolymerization reactor, a first loop reactor and a second loop reactor. The polymerization method and steps are as follows:

[0047] Pre-polymerization reaction:

[0048] The main catalyst (active solid catalyst component containing titanium) was obtained by the method described in Example 1 in Chinese patent CN93102795.0, and the internal electron donor compound was diisobutyl phthalate. The obtained main catalyst Ti content 2.2wt%, the content of diisobutyl phthalate is 11.2wt%.

[0049] The main catalyst, co-catalyst (triethylaluminum), and external electron donor (methylcyclohexyldimethoxysilane) are pre-contacted at 10°C for 20 minutes, and then continuously added to the pre-polymerization reactor for pre-polymerization. The polymerization is carried out in the bulk environment of the liquid phase of propylene, the temperature is 15°C, and the residence time is about 4...

Embodiment 2

[0055] Same as Example 1, except that the amount of α-olefin added is changed, and the specific process conditions are shown in Table 1.

Embodiment 3

[0057] Same as Example 1, except that the amount of α-olefin added is changed, and the specific process conditions are shown in Table 1.

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Abstract

The invention relates to a preparation method of a propylene-alpha-olefin random copolymer, which comprises the following steps: (1) carrying out a prepolymerization reaction on a Ziegler-Natta catalyst; (2) in the presence of the catalyst and in a hydrogen atmosphere, controlling the polymerization temperature to be 0-150 DEG C through regulating the adding amount of comonomer alpha-olefin, and carrying out a polymerization rection between propylene and alpha-olefin to obtain the propylene-alpha-olefin random copolymer. The preparation method is easy in polymerization process, and can avoid condition that antisticking agents for vessels, agglomerations and residue monomers are difficult to remove thoroughly.

Description

Technical field [0001] The invention belongs to the field of propylene random copolymer and its preparation and application, and particularly relates to a method for preparing a propylene-α-olefin random copolymer for manufacturing high-temperature cooking CPP films. Background technique [0002] Cast film (Castfilnl) is a non-stretched, non-oriented, flat-extrusion film produced by melt casting quenching. Compared with blown film, it is characterized by fast production speed, high output, good film transparency, gloss, thickness uniformity, and excellent balance of anisotropic properties. At the same time, because it is a flat-extrusion film, the subsequent processes such as printing and laminating are extremely convenient, so it is widely used in the packaging of textiles, flowers, food, and daily necessities. [0003] CPP film can be divided into cooking grade and non-cooking grade. Retort grade refers to a composite substrate film that can be combined with PET, NY, aluminum f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F210/06C08F4/646
Inventor 王荣和陈国康黄伟东沈峰明闵丽华
Owner CHINA PETROLEUM & CHEM CORP
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