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A kind of polypropylene blown film and preparation method thereof

A polypropylene and blown film technology, which is applied in the field of polypropylene blown film and its preparation, can solve the problems of decreased heat resistance, poor puncture and impact resistance of the film, etc.

Active Publication Date: 2019-04-19
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the addition of ethylene monomer, the toughness of the film is improved, but the difference between the longitudinal and transverse tear strength of the film is still large, and the heat resistance of the film is greatly reduced
In addition, the general commercial polypropylene has poor puncture and impact resistance, and an impact-reinforced polypropylene is needed for the preparation of polypropylene blown film

Method used

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  • A kind of polypropylene blown film and preparation method thereof
  • A kind of polypropylene blown film and preparation method thereof
  • A kind of polypropylene blown film and preparation method thereof

Examples

Experimental program
Comparison scheme
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preparation example Construction

[0096] Preparation of polypropylene base resin HMSPP801:

[0097] The propylene polymerization reaction is carried out on a polypropylene unit, and the main equipment of the unit includes a prepolymerization reactor, a first loop reactor, a second loop reactor and a third gas phase reactor. The polymerization method and steps are as follows.

[0098] (1) Prepolymerization reaction

[0099] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (diisopropyldimethoxysilane, DIPMS) were tested at 6 °C , After 20min pre-contact, continuously add to the continuous stirred tank type pre-polymerization reactor for pre-polymerization reactor. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of diisopropyldimethoxysilane is 0.3g / hr, the flow of main catalyst is 0.6g / hr, and the ratio of TEA / DIPMS is 50 (mol / mol). The pre-po...

Embodiment 1-10

[0115] Preparation of polypropylene base resin

[0116] The high melt strength impact polypropylenes HMSPP801, HMSPP802, HMSPP803 and HMSPP804 used as base resins were respectively prepared according to the above preparation methods of HMSPP801, HMSPP802, HMSPP803 and HMSPP804.

[0117] Preparation of polypropylene blown film

[0118] According to the specific formula shown in Table 3, take a certain amount of high-impact high-melt strength polypropylene (HMSPP601 or HMSPP602 (100 parts by weight) prepared through a special process), and a certain amount of antioxidant 1010 (about 0.2 parts by weight) parts), secondary antioxidant 168 (about 0.1 parts by weight), and calcium stearate (about 0.1 parts by weight) were mixed and stirred evenly. Then use a twin-screw extruder to mix and granulate. The temperature settings of each section of the extruder are, for example: 170°C, 180°C, 190°C, 200°C, 210°C, 215°C (head). The obtained pellets are extruded on the blown film machine ...

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Abstract

The invention provides a polypropylene composition which is used to be blow-molded into a film. The polypropylene composition comprises a high-melt strength impact-resistant polypropylene as base resin, moreover, the high-melt strength impact-resistant polypropylene includes a random copolymer polypropylene continuous phase and a propylene-ethylene copolymer rubber dispersed phase, and the room-temperature xylene soluble content is greater than or equal to 10 percent by weight and less than or equal to 35 percent by weight; and furthermore, the ratio of the Mw of room-temperature trichlorobenzene soluble to the Mw of room-temperature trichlorobenzene insoluble is greater than 0.4 an less than or equal to 1. The invention further provides a polypropylene blow-molded film prepared by blow-molding the composition and a preparation method thereof. The polypropylene blow-molded film has the characteristics of high impact resistance and tear resistance and high tensile strength, and is particularly suitable for fields such as cooked food packages, microwave food packages, medical high-temperature cooking disinfection and large heavy packages.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a composition for preparing a polypropylene blown film, a polypropylene blown film prepared by the composition and a preparation method thereof. Background technique [0002] Polypropylene (PP) film has high mechanical strength, good heat resistance and oil resistance, and good transparency. It is widely used in industry and daily life, especially suitable for cooking bags, microwave food Packaging, medical high-temperature cooking and disinfection, and large heavy packaging, etc. [0003] Extrusion blown film has simple process, less equipment and cost advantage. Extrusion blown film accounts for 85% of all film production. But for polypropylene film, it has been mainly produced by extrusion casting single and biaxial stretching technology for a long time. Due to the low melt viscosity and melt strength of ordinary polypropylene resin, it is difficult to extrusion blown into ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08L23/16C08K5/134C08K5/26C08K5/098C08F210/06C08F210/16
CPCC08F210/06C08F210/16C08F2500/11C08J5/18C08L23/14C08L2201/08C08L2203/16C08L2205/025C08L2205/03C08L2207/02C08L2308/00C08L2314/02C08K5/1345C08K5/26C08K5/098
Inventor 郭鹏吕明福徐耀辉张师军张丽英邵静波董穆初立秋徐凯
Owner CHINA PETROLEUM & CHEM CORP