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Polyethylene composition and microporous film thereof

A technology of polyethylene and composition, applied in the field of polyethylene composition and its microporous membrane, which can solve the problems of poor film-forming property and easy rupture of the film

Active Publication Date: 2017-04-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the poor film-forming properties and easy rupture of the film when the existing polyethylene raw material is prepared by the flat film stretching method to prepare the polyethylene microporous film, that is, it is not suitable for the preparation of the microporous film by the flat film stretching method. defects, and provide a new polyethylene composition and microporous membrane made of the polyethylene composition

Method used

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  • Polyethylene composition and microporous film thereof
  • Polyethylene composition and microporous film thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0035] According to a preferred embodiment of the present invention, the polyethylene composition is figure 1Prepared in the shown multi-reactor parallel device, described multi-reactor parallel device comprises first reactor 1, second reactor 2, third reactor 3, solid / liquid (gas) separator 4, homogenizer The silo 5 and the melt granulation system 6, wherein the first reactor 1, the second reactor 2 and the third reactor 3 are connected in parallel, and the number of the solid / liquid (gas) separator 4 is three One, communicated with the first reactor 1, the second reactor 2 and the third reactor 3 respectively, the component A produced by the first reactor 1, the component B produced by the second reactor 2 and the component B produced by the third reactor The component C prepared by the reactor 3 is carried out phase separation in different solid / liquid (gas) separators 4 respectively, and then the component A, component B and component C after the phase separation will be t...

Embodiment 1

[0049] This example is used to illustrate the polyethylene composition and its microporous membrane provided by the present invention.

[0050] (1) Preparation of polyethylene composition:

[0051] The polyethylene composition provided in this example is composed of component A, component B, component C, functional filler, lubricant and antioxidant, wherein, component A, component B and component C are all ethylene / α olefin copolymerized linear low density polyethylene (LLDPE), component A and component B are prepared using Ziegler-Natta catalyst (the Ziegler-Natta catalyst system is prepared by CN101838351A embodiment 1 Ziegler-Natta catalyst system, the same below), component C is prepared by using a metallocene catalyst (the metallocene catalyst system is the supported metallocene catalyst prepared in Example 1 of CN102453124A, the same below). Specific steps are as follows:

[0052] Add ethylene, α-olefin, hydrogen and nitrogen (ethylene, α-olefin, hydrogen and nitrogen...

Embodiment 2

[0062] This example is used to illustrate the polyethylene composition and its microporous membrane provided by the present invention.

[0063] (1) Preparation of polyethylene composition:

[0064] The polyethylene composition provided in this example is composed of component A, component B, component C, functional filler, lubricant and antioxidant, wherein, component A, component B and component C are all ethylene / α olefin copolymerized linear low density polyethylene (LLDPE), component A and component B are prepared by Ziegler-Natta catalyst, and component C is prepared by metallocene catalyst. Specific steps are as follows:

[0065]Add ethylene, alpha olefin, hydrogen and nitrogen into the fluidized bed gas phase reactor, then add the catalyst system, and then polymerize under the conditions of temperature 84-88°C and pressure 1.8-2.0MPa to obtain components A, Component B and Component C. Among them, the control of the melt index of component A, component B and compone...

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Abstract

The invention provides a polyethylene composition and a microporous film thereof. The polyethylene composition contains a component A, a component B, a component C, and functional filling materials. The component A is linear low density polyethylene made from ethylene / alpha-alkene through copolymerization, has the melt index MIA being 0.01-3.5 g / 10 min with 2.16 kg of load at 190 DEG C, and has the density [rho]A being 0.880-0.936 g / cm<3>. The component B is linear low density polyethylene made from ethylene / alpha-alkene through copolymerization, has the melt index MIB being 3.6-14.9 g / 10 min with 2.16 kg of load at 190 DEG C, and has the density [rho]B being 0.910-0.930 g / cm<3>. The component C is linear low density polyethylene made from ethylene / alpha-alkene through copolymerization, has the melt index MIC being 15-150 g / 10 min with 2.16 kg of load at 190 DEG C, and has the density [rho]C being 0.880-0.930 g / cm<3>. The polyethylene microporous film is made from the polyethylene composition through flat film stretching, and is large in draw ratio, high in film forming rate, and good in film-forming property.

Description

technical field [0001] The invention relates to a polyethylene composition and a microporous film thereof. Background technique [0002] Microporous film is a composite material based on thermoplastics and filled with high content of inorganic particles. It is made into a film by calendering, casting, blown film and other methods, and then further obtained by uniaxial or biaxial stretching to obtain a small and fine pore size. Interpenetrating microporous film material. The microporous membrane can only pass through water vapor molecules with a small molecular structure, but cannot allow water droplets in an aggregated state to penetrate through, so it has the characteristics of air permeability and impermeability, thereby achieving the effect of waterproof and moisture permeability. called a breathable membrane. [0003] Theoretically, thermoplastics can be used as matrix resins for breathable membrane materials. Since polyethylene has the characteristics of comfortable,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08L71/08C08L23/06C08K3/26C08K5/526C08K5/134
CPCC08J5/18C08J2323/08C08J2423/08C08K2201/003C08L23/0815C08L2203/16C08L2205/025C08L2205/035C08L2314/02C08L2314/06C08L71/00C08K2003/265C08K5/1345C08K5/526C08L23/06
Inventor 初立秋高达利邹浩施红伟郭鹏刘建叶郭梅芳李杰董穆解娜
Owner CHINA PETROLEUM & CHEM CORP