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Polyethylene composition for film and preparation method thereof and polymer film

An ethylene polymer and composition technology, applied in the field of polyethylene, can solve the problems of high longitudinal tear strength and the film is not resistant to longitudinal tear, and achieve the effect of high longitudinal tear strength

Active Publication Date: 2019-03-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome that the film of linear low density polyethylene film blowing in the prior art is not resistant to longitudinal tearing, provides a kind of polyethylene composition for film and its preparation method and polymer film, adopts the present invention Polymer film prepared from a polyethylene composition for film, having high longitudinal tear strength

Method used

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  • Polyethylene composition for film and preparation method thereof and polymer film
  • Polyethylene composition for film and preparation method thereof and polymer film
  • Polyethylene composition for film and preparation method thereof and polymer film

Examples

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preparation example Construction

[0036] The preparation method of the polyethylene composition for film provided by the present invention is not particularly limited. For example, the ethylene polymer and the film-forming aid can be stirred and mixed uniformly and extruded to pelletize. The ethylene polymer contains ethylene derived from ethylene. Structural unit, derived from C 4 -C 8 The α-olefin structural unit of the α-olefin, based on the total amount of the ethylene polymer, the content of the ethylene structural unit is 94-96.2% by weight, and the content of the α-olefin structural unit is 3.8-6 weight%. Based on the total amount of the polyethylene composition for film, the amount of the ethylene polymer is 98-99.98% by weight, and the amount of the film-forming aid is 0.02-2% by weight. The melt flow rate (MFR) of the polyethylene composition for film at 190°C under a load of 2.16 kg is 1-3 g / 10 min, preferably 1-2.5 g / 10 min.

[0037] Wherein, the type of the film-forming aid has been described a...

Embodiment 1

[0059] This embodiment is used to illustrate the polyethylene composition for film provided by the present invention and polymer film

[0060] Continuously feed the catalyst solid component at 0.63g / h for 60m 3 In the continuous gas-phase fluidized bed reactor, add triethylaluminum continuously with pump, its addition makes the molar ratio Al / Ti=36 of the aluminum in the triethylaluminum and the titanium in the catalyst solid component, to the described Feed ethylene, 1-butene and hydrogen into the reactor for polymerization, wherein the pressure of the reactor is 2.0MPa, the temperature of the reactor is 68°C, and the hydrogen / ethylene molar ratio in the reactor is (H2 / C2) was 0.018, based on the total amount of ethylene and 1-butene, the ethylene content was 94% by weight, and the 1-butene content was 6% by weight. The average residence time of ethylene, 1-butene and hydrogen in the reactor is 30 min. The density of gained low-density polyethylene is 0.915g / cm 3 , The mel...

Embodiment 2

[0064] This embodiment is used to illustrate the polyethylene composition for film provided by the present invention and polymer film

[0065] According to the method of Example 1, the difference is that 99.23 parts by weight of ethylene polymer, 0.5 parts by weight of anti-oxidant talcum powder, 0.15 parts by weight of erucamide, 0.1 parts by weight of antioxidant B125 and 0.02 parts by weight of stearin are added Calcium acid stirs and mixes homogeneously, and granulation and follow-up test process are identical with embodiment 1.

[0066] The longitudinal tear strength test was carried out on the film prepared above, and the tear length was 8.7 cm.

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Abstract

The invention relates to the field of polyethylene, and discloses a polyethylene composition for a film and a preparation method thereof and a polymer film. The composition contains an ethylene polymer and a coalescing agent, wherein the ethylene polymer contains an ethylene structural unit derived from ethylene and an alpha-olefin structural unit derived from C4-C8 alpha-olefin; on the basis of the total amount of the ethylene polymer, the content of the ethylene structural unit is 94-96.2wt%, and the content of the alpha-olefin structural unit is 3.8-6wt%; and on the basis of the total amount of the polyethylene composition for the film, the content of the ethylene polymer is 98-99.98wt%, and the content of the coalescing agent is 0.02-2wt%. A polymer film prepared by using the polyethylene composition for the film has high longitudinal tear strength.

Description

technical field [0001] The invention relates to the field of polyethylene, in particular to a polyethylene composition for film, a preparation method thereof and a polymer film. Background technique [0002] The main function of mulch products is to keep moisture and keep moisture, and its outstanding performance requirement is good longitudinal tearing performance. The tearing damage of the mulch material is a process in which the film is subjected to external forces, generally affected by the wind, caused by initial small holes, cracks or other defects on the film material, and then rapidly expands and leads to the overall destruction of the film material. [0003] Domestic linear low density polyethylene film blown film can not meet the application in this field. For example, DFDA9020, an ultra-thin mulch film LLDPE special material produced by Tianjin Petrochemical Company, has low longitudinal tear strength, and it is easy to cause the overall tear of the film material...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08K13/02C08K3/34C08K5/20C08K5/098C08F210/16C08F210/08
CPCC08F210/16C08J5/18C08J2323/08C08K3/34C08K5/098C08K5/20C08K13/02C08L2203/16C08L2207/066C08L23/0815C08F210/08
Inventor 谷汉进王素玉张丁钱鑫
Owner CHINA PETROLEUM & CHEM CORP