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Method for preparing BOPP (Biaxially-oriented Polypropylene)

A polypropylene and ethylene technology, applied in the field of BOPP special polypropylene

Active Publication Date: 2013-02-06
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In many applications, it is hoped that the BOPP film has both high stiffness and high pulling speed. The above two methods are not suitable.

Method used

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  • Method for preparing BOPP (Biaxially-oriented Polypropylene)
  • Method for preparing BOPP (Biaxially-oriented Polypropylene)
  • Method for preparing BOPP (Biaxially-oriented Polypropylene)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Heat the 5L high-pressure reactor to vacuumize, remove air and water, replace with nitrogen, repeat three times, and then add MgCl 2 Loaded TiCl 4 Catalyst solid component 20mg, the content of Ti in the solid component is 2.36wt%, the addition of triethyl aluminum is Al / Ti (mol)=600, cyclohexylmethyl dimethoxy silicon, n-propylene triethoxy Silane, the molar ratio of the two is 70:30, the molar ratio of the two external electron donors to Ti is 20, and then 16 mmol hydrogen and 1.2 kg propylene are added. Close the reaction kettle, raise the temperature of the kettle to 70°C, and start polymerization. After 2 hours of reaction, discharge unreacted propylene to obtain polypropylene particles. The melt index of polypropylene is 2.8gPP / 10min, and the isotacticity is 97.2%. After the polypropylene sample is analyzed by SSA, the thickness of the largest lamella in polypropylene is 25.44nm, and the area ratio of the largest peak is 12%.

Embodiment 2-9

[0048] The polymerization process was the same as in Example 1, only the type and ratio of the external electron donor were changed. The results are shown in Table 1.

Embodiment 10-11

[0052] The polymerization process is the same as in Example 1, except that 0.6% butene-1 by mass of propylene is added, and the type and ratio of external electron donors are changed. The results are shown in Table 1.

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PUM

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Abstract

The invention provides a method for preparing BOPP (Biaxially-oriented Polypropylene). A catalytic system used comprises a solid catalyst component (A), alkyl aluminium (B) and a multivariant external electron donor (C), wherein the component (A) is a magnesium chloride-loaded Ti solid component and contains a dibutyl phthalate internal electron donor; the component (B) is a trialkylaluminium; the component (C) comprises a first class external electron donor and a second class external electron donor with a mole ratio between 0.5:99.5 and 90:10, wherein the first external electron donor selects cyclohexyl methyl dimethoxy silane, dicyclohexyl dimethoxy silane, 2-piperidine dimethoxy silane and composition thereof; and the second class external electron donor selects tetraethoxysilane, n-Propyltriethoxysilane, n-Propyltrimethoxysilane, 1,1-dimethyl amino trimethoxy silane, 1,1-dimethyl amino triethoxy silane and composition thereof. A small amount of ethylene, 1-butene or a composition thereof is added in polymerization as a comonomer.

Description

technical field [0001] The invention relates to a method for preparing polypropylene, especially a method for BOPP special polypropylene. Background technique [0002] Biaxially oriented polypropylene (BOPP) film is a kind of film material with excellent performance formed by stretching the extrusion cast polypropylene (PP) resin in the longitudinal direction (MD) and transverse direction (TD). BOPP film has the advantages of low haze, excellent stiffness, excellent heat sealing strength, high transparency and gloss, so it is widely used in packaging materials and functional special films and other fields. [0003] With the increase of domestic demand for BOPP film, BOPP film processing technology is increasingly developing towards high line speed. Since the spherulites in BOPP molecules are melted during vertical and horizontal stretching at a certain temperature, and are sheared and deformed at the same time, the spherulite molecules of each layer are melted and disentang...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F4/649C08F4/646C08F110/06C08F210/06C08L23/12C08L23/14C08L23/16
Inventor 李化毅常贺飞张辽云胡友良黄伟欢黄强
Owner INST OF CHEM CHINESE ACAD OF SCI
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