A kind of polypropylene composition and its preparation method and application

A polypropylene composition and composition technology, applied in the field of polymers, can solve the problems of unfavorable fast packaging production lines, increased processing costs, narrow processing window, etc., and achieve the effects of good mechanical properties, fast heat sealing speed, and low packaging cost

Active Publication Date: 2020-11-10
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since PLA is an easily degradable material, the processing window is narrow and the price is high, so it is not conducive to the fast packaging production line and increases the processing cost

Method used

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  • A kind of polypropylene composition and its preparation method and application
  • A kind of polypropylene composition and its preparation method and application
  • A kind of polypropylene composition and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Preparation of homemade aromatic copolyester: Add 600g terephthalic acid, 400g isophthalic acid, 20g phthalic acid, 600g ethylene glycol, 0.5g antimony trioxide and 0.2g trimethyl phosphate into the reaction kettle , and then replace the reactor with high-purity nitrogen, and the initial pressure is 0.12MPa. Stir to raise the temperature to 220°C, raise the pressure to 0.4MPa for the first contact reaction for 4 hours, then raise the temperature to 275°C, reduce the pressure to 60Pa for the second contact reaction for 1 hour, and extrude into strips under nitrogen pressure in a molten state. After water cooling, it is granulated by a granulator to obtain non-crystalline copolyester chips. Its intrinsic viscosity is 0.65dl / g, and its glass transition temperature range is 67°C.

Embodiment 2

[0042] Yangzi Petrochemical ternary copolymerized polypropylene pellets PPR-FO7-V (containing 1.6 mol% of ethylene and 5.1 mol% of 1-butene, with a melting index of 6.2g / 10min and a melting point of 135°C) and Example 1 provide The self-made aromatic copolyester was mixed, and the polypropylene composition was prepared by melt blending at 200°C, wherein the content of the self-made aromatic copolyester was 5wt%. The polypropylene composition was formed into a film with a thickness of 0.2 mm using a single-screw caster with a screw temperature of 230°C. Determine the initial heat-sealing temperature and mechanical properties of the film, and the results are included in the figure 1 and Table 1.

Embodiment 3

[0044] Yangzi Petrochemical ternary copolymerized polypropylene pellets PPR-FO7-V (containing 1.6 mol% of ethylene and 5.1 mol% of 1-butene, with a melting index of 6.2g / 10min and a melting point of 135°C) and Example 1 provide The self-made aromatic copolyester was mixed, and the polypropylene composition was prepared by melt blending at 200°C, wherein the content of the self-made aromatic copolyester was 10wt%. The polypropylene composition was formed into a film with a thickness of 0.1 mm using a single-screw casting machine, and the temperature of the screw was 200°C. Determine the initial heat-sealing temperature and mechanical properties of the film, and the results are included in the figure 1 and Table 1.

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Abstract

The invention provides a polypropylene composition. The polypropylene composition comprises co-polypropylene and non-crystalline type aromatic copolyester; and preferably based on the weight of the composition, the content of the aromatic copolyester is 2 to 40 wt%, preferably 5 to 30 wt%, and preferably 8 to 15 wt%. The invention also provides a preparation for the composition. The invention also relates to an application of the composition in the field of heat-seal packaging. The invention provides a polypropylene film formed by the composition. The invention also provides a composite film which comprises a substrate layer and a heat-seal layer located on at least one surface of the substrate layer, wherein the heat-seal layer is formed by the polypropylene film. The composition provided by the invention has the advantage of low heat conductivity; and the polypropylene film prepared from the composition has rapid heat-seal speed and good mechanical properties, and is extensively applicable to the field of heat-seal packaging.

Description

technical field [0001] The invention relates to the field of polymers, in particular to a polypropylene composition and its preparation method and application. Background technique [0002] Polyolefin films, especially polypropylene and polyethylene films, are widely used in packaging. These packaging films are usually heated and sealed to achieve a certain strength to meet the requirements of packaging production and transportation. The seal initiation temperature (seal initiation temperature, SIT) is an important index to investigate the heat-sealing film, and it is of great significance to evaluate the performance of rapid packaging, energy saving and environmental protection. In the prior art, certain polymers are usually added in the film preparation process to lower the heat-sealing temperature, but the added polymers often lead to a decrease in the mechanical properties of the film. Therefore, how to reduce the initial heat-sealing temperature of polyolefin film wit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/14C08L67/02
CPCC08J5/18C08J2323/14C08J2467/02C08L23/14C08L2203/16C08L67/02
Inventor 李娟张艳霞张龙贵郭敏郭梅芳
Owner CHINA PETROLEUM & CHEM CORP
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