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Polymer membrane, and preparation method thereof

A technology of polymer film and polypropylene composition, applied in the production of bulk chemicals, etc., can solve the problems of poor rigidity and stiffness, transparency and impact resistance of polypropylene film, etc., and achieve high impact resistance , Simplify the process of selection and processing, and the effect of high transparency

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the defects that the polypropylene film in the prior art cannot have both transparency and impact resistance, and poor rigidity and stiffness, thereby providing a polymer film and a preparation method of the polymer film

Method used

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  • Polymer membrane, and preparation method thereof
  • Polymer membrane, and preparation method thereof
  • Polymer membrane, and preparation method thereof

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Embodiment approach

[0029] According to a preferred embodiment of the present invention, the polypropylene composition is prepared by continuous polymerization in the presence of a Ziegler-Natta catalyst with high stereoselectivity. The continuous polymerization method means that the preparation process includes at least two sequential steps, wherein component (a) (i.e. crystalline polypropylene A) and component (b) (i.e. ethylene-propylene elastic copolymer B) are each in It is prepared in a separate step and, in addition to the first step, the latter step is carried out in the presence of the polymer formed in the previous step and the catalyst used in the previous step.

[0030] In the preferred case above, since the polypropylene composition is prepared using a Ziegler-Natta catalyst with high stereoselectivity, the molecular weight distribution of the polypropylene composition and the molecular weight distribution of its component (a) are greater than 4 , preferably greater than 4.5, more pr...

Embodiment 1

[0088] (1) Preparation of polypropylene composition

[0089] The polymerization reaction is carried out on the above-mentioned horizontal gas-phase polypropylene pilot plant, and the reaction is carried out according to the above-mentioned method. The external electron donor used in the polymerization reaction is diisobutyldimethoxysilane, the first reactor is used to prepare component (a) by homopolymerization of propylene, the polymerization temperature is 66°C, the reaction pressure is 2.3MPa, and the residence time is 90 minutes . The second reactor is used for propylene copolymerization to prepare component (b). Ethylene and propylene are added into the reactor. The polymerization temperature is 66° C., the reaction pressure is 2.2 MPa, and the residence time is 60 minutes. The polymer obtained by the reaction is subjected to degassing and wet nitrogen deactivation treatment to obtain a polypropylene composition. The reaction conditions and product properties are shown ...

Embodiment 2

[0094] (1) Preparation of polypropylene composition

[0095] The polymerization reaction is carried out on the above-mentioned horizontal gas-phase polypropylene pilot plant, and the reaction is carried out according to the above-mentioned method. The external electron donor used in the polymerization reaction is diisopropyldimethoxysilane, the first reactor is used to prepare component (a) by homopolymerization of propylene, the polymerization temperature is 66°C, the reaction pressure is 2.3MPa, and the residence time is 90 minutes . The second reactor is used for propylene copolymerization to prepare component (b). Ethylene and propylene are added into the reactor. The polymerization temperature is 66° C., the reaction pressure is 2.2 MPa, and the residence time is about 60 minutes. The polymer obtained by the reaction is subjected to degassing and wet nitrogen deactivation treatment to obtain a polypropylene composition. The reaction conditions and product properties are...

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Abstract

The invention discloses a polymer membrane, and a preparation method thereof. The polymer membrane is composed of a polypropylene composition. The polypropylene composition comprises (a) 70 to 95wt% of a crystalline polypropylene A, wherein the crystalline polypropylene A is at least one selected from a propylene homopolymer and a propylene random copolymer, and (b) 5 to 30wt% of an ethylene / propylene elastic copolymer. The molecular weight distribution indexes of the polypropylene composition and the crystalline polypropylene A are both larger than 4; melt mass-flow rate of the polypropylene composition at 230 DEG C under loading of 2.16kg ranges from 5 to 10g / 10min, and the ratio of the melt mass-flow rate ratio of the polypropylene composition to the melt mass-flow rate ratio of the crystalline polypropylene A ranges from 0.7 to 1.3. The polymer membrane is relatively high in transparency, and possesses excellent shock resistance, and excellent performance uniformity in the axial direction and the radial direction.

Description

technical field [0001] The invention relates to a polymer film and a preparation method of the polymer film. Background technique [0002] Polyolefin films are widely used in food packaging, refrigerated packaging, frozen packaging, medical equipment, daily necessities packaging, etc. These fields usually require films to have good transparency. Films made of propylene copolymers obtained by random copolymerization with monomers such as ethylene and butene generally have good transparency. Adding transparency aids to homopolypropylene can also produce high-transparency films. However, as a packaging film, it needs to have good impact resistance to prevent the film from being damaged under the impact of external force. Atactic polypropylene and homopolypropylene are limited by their molecular structure, and their impact resistance is not ideal. [0003] In order to improve the impact resistance of the film, it is mentioned in CN1675257A that 10-50% ultra-low density polyeth...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/16C08K5/134C08K5/526C08K5/098C08F110/06C08F210/16C08F4/646
CPCY02P20/52
Inventor 徐萌高达利徐凯张师军邹浩杨芝超吕芸郭鹏吕明福权慧杜亚峰
Owner CHINA PETROLEUM & CHEM CORP