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Polypropylene resin for biaxially oriented film and preparation method of polypropylene resin

A technology of biaxially stretched film and polypropylene resin, applied in the field of polypropylene resin for biaxially stretched film and its preparation

Inactive Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, under the premise of ensuring other good properties, there are few researches on special materials for BOPP films with low ash content.

Method used

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  • Polypropylene resin for biaxially oriented film and preparation method of polypropylene resin
  • Polypropylene resin for biaxially oriented film and preparation method of polypropylene resin
  • Polypropylene resin for biaxially oriented film and preparation method of polypropylene resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Preparation of Spherical Catalyst Components

[0065] Add 90ml of titanium tetrachloride and 10ml of hexane into a 300ml stirred glass reaction bottle fully replaced by high-purity nitrogen, cool to -20°C, add 8g of spherical magnesium chloride alcoholate carrier (for the preparation method, refer to the Chinese patent CN1330086A), under stirring, slowly raise the temperature to 110°C in stages, add 1.3ml of 2,4-pentanediol dibenzoate and 1.3ml of 2-isopropyl-2-isoamyl during the heating process - 1,3-dimethoxypropane, after keeping the temperature at 110°C for 0.5h, filter off the liquid, add titanium tetrachloride to treat twice, each time the amount of titanium tetrachloride is 80ml, and then wash five times with hexane, Spherical catalysts were obtained after vacuum drying.

[0066] Propylene polymerization

[0067] In a 5L autoclave, a nitrogen stream was used for purging, and then a hexane solution containing 0.5 mmol of triethylaluminum, a hexane solution conta...

Embodiment 2

[0069] The preparation of the spherical catalyst component is the same as in Example 1.

[0070] Propylene polymerization: the same as in Example 1 except that the precontact reaction is 2 mins and the temperature is 25°C.

Embodiment 3

[0072] The preparation of the spherical catalyst component is the same as in Example 1.

[0073] Propylene polymerization: the same as in Example 1 except that the precontact reaction is 10 minutes and the temperature is 15°C.

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Abstract

The invention relates to polypropylene resin for a biaxially oriented film and a preparation method of the polypropylene resin. The ash content of the polypropylene resin is lower than 100 ppm, the MFR (melt flow rate) is in a range of 1-10 g / 10 min, the isotactic index is in a range of 95-99%, the molecular weight distribution index MW / Mn is in a range of 5-15, and the weight-average molecular weight MW is higher than 360,000. The preparation method comprises steps as follows: a catalyst with high activity and high stereo orientation is adopted, all components of the catalyst have a pre-contact reaction, preferably, products of the pre-contact reaction and olefin polymerization monomers are pre-polymerized and have a propylene polymerization reaction under a specific polymerization condition, and the polypropylene resin which is low in ash content, wider in molecular weight distribution, high in mechanical strength and good in tensile property can be obtained. The polypropylene resin can be used for preparing BOPP films with high stiffness, good tensile property and good film appearance.

Description

technical field [0001] The present invention relates to a kind of polypropylene resin for biaxial stretching film and its preparation method, more specifically, relates to a kind of polypropylene resin prepared by using special catalyst under specific polymerization conditions and corresponding preparation method, the polypropylene resin can be used For the production of biaxially stretched film. Background technique [0002] Biaxially oriented polypropylene (BOPP) film is a very important plastic film material, which has excellent mechanical properties and optical properties, as well as light weight, non-toxic, odorless, moisture-proof, and low price. It is used as a packaging material and Functional film materials have been widely used in the fields of clothing, food, medicine and health, petrochemical, electronic appliances, aerospace, biotechnology and other fields. High-quality BOPP film should have high stiffness and good stretchability, as well as good appearance. ...

Claims

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Application Information

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IPC IPC(8): C08F10/06C08F4/649
CPCY02P20/52
Inventor 赵瑾夏先知刘月祥谭扬高富堂凌永泰高平李威莅彭人琪张纪贵
Owner CHINA PETROLEUM & CHEM CORP
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