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Composition for preparing linear low-density polyethylene film and preparation method thereof

A linear low-density, polyethylene film technology, applied in the field of polyethylene film, can solve the problems of complex acquisition methods of anti-reflection agents, poor optimization effect of low haze of LLDPE film, complicated preparation method of LLDPE film, etc., to reduce light reflection and Light scattering, good mechanical properties, effect of increasing density

Inactive Publication Date: 2019-04-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, the acquisition method of the anti-reflection agent is complicated, which leads to the complicated preparation method of the LLDPE film, and the low haze optimization effect of the LLDPE film is poor

Method used

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  • Composition for preparing linear low-density polyethylene film and preparation method thereof

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Experimental program
Comparison scheme
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Embodiment 1

[0080]This embodiment provides an LLDPE film, which is prepared by the following method: 100 parts by weight of LLDPE, 0.08 parts by weight of nucleating agent HPN-20E, 4,4'-thiobis(6-tert-butyl- 0.03 parts by weight of 3-methylphenol) and 0.07 parts by weight of calcium stearate were added in the mixer and mixed for 5min, and then the obtained mixed material was added to the twin-screw extruder whose temperature of the barrel and the machine head was 150°C. Finally, put the pellets into a film blowing machine at a temperature of 150°C to blow the film, and control the inflation ratio to 2 to obtain an LLDPE film.

[0081] Wherein, the LLDPE adopted in the present embodiment is obtained by copolymerizing 99% ethylene and 1% 1-butene under the catalysis of Ziegler-Natta catalyst, and the density of LLDPE is 0.920 g / cm 3 , MFR is 2.0g / 10min.

Embodiment 2

[0083] This embodiment provides a kind of LLDPE film, and this LLDPE film is prepared by the following method: 100 parts by weight of LLDPE, 0.08 parts by weight of aluminum n-butylbenzoate, tris(2,4-di-tert-butylphenyl) phosphite Add 0.03 parts by weight of ester and 0.07 parts by weight of zinc stearate into a mixer and mix for 6 minutes, then add the obtained mixture into a twin-screw extruder whose barrel and head temperature are 160°C for granulation, and finally granulate the granules The material is put into a film blowing machine at a temperature of 160°C to blow the film, and the inflation ratio is controlled to be 2.2 to obtain an LLDPE film.

[0084] Wherein, the LLDPE adopted in this embodiment is the same as the LLDPE used in Embodiment 1.

Embodiment 3

[0086] This embodiment provides a kind of LLDPE film, and this LLDPE film is prepared by the following method: 100 parts by weight of LLDPE, 0.05 part by weight of hydroxyaluminum tert-butylbenzoate, 0.05 part of silicon dioxide, tetrakis [β-(3,5 -Di-tert-butyl-4-hydroxyphenyl)propionic acid] 0.03 parts by weight of pentaerythritol ester, 0.07 parts by weight of calcium stearate were added in the mixer and mixed for 7min, then the mixed material obtained was added to the cylinder and the temperature of the machine head was uniform. Pelletize in a twin-screw extruder at 170°C, and finally put the pellets into a film blowing machine at a temperature of 170°C to blow the film, and control the inflation ratio to 2.3 to obtain an LLDPE film.

[0087] Wherein, the LLDPE adopted in this embodiment is the same as the LLDPE used in Embodiment 1.

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Abstract

The invention discloses a composition for preparing a linear low-density polyethylene film and a preparation method thereof, and belongs to the field of polyethylene films. The composition comprises the following components in parts by weight: 100 parts of linear low-density polyethylene, 0.02-0.5 part of a nucleating agent, 0.01-0.1 part of an antioxidant and 0.01-0.1 part of an acid absorbent. The nucleating agent is an organic acid salt nucleating agent and / or an inorganic nucleating agent; the organic acid salt nucleating agent is at least one selected from the group consisting of aluminumn-butyl benzoate, aluminum hydroxyl p-tert-butyl benzoate and nucleating agent HPN-20 E; AND the inorganic nucleating agent is selected from at least one of silicon dioxide, mica and talc. The LLDPE(low density polyethylene) film with good mechanical properties such as low haze, high light transmittance, high strength and the like can be obtained from the linear low-density polyethylene, the nucleating agent, the antioxidant and the acid-absorbing agent by blending, plasticizing, melting, extrusion, granulation and film blowing forming.

Description

technical field [0001] The invention relates to the field of polyethylene films, in particular to a composition for preparing linear low-density polyethylene films and a preparation method thereof. Background technique [0002] Linear low density polyethylene (Linear low density polyethylene, abbreviated as LLDPE) is a polymer obtained by copolymerizing ethylene as the main raw material and adding a small amount of other olefins. The LLDPE film made of LLDPE has good toughness, high strength, cold resistance, heat resistance and other properties. LLDPE film is widely used in industry, agriculture, medicine and other fields. At present, there are more and more demands for LLDPE films with low haze. Among them, the lower the haze, the better the gloss, transparency and imaging performance of LLDPE films. Therefore, it is very necessary to provide a composition or a preparation method for preparing a linear low density polyethylene film with low haze performance. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/08C08K5/00C08K5/375C08K5/098C08K5/526C08K13/02C08K3/36C08K5/134C08K5/10C08K3/34C08J5/18
CPCC08J5/18C08J2323/08C08K3/34C08K3/36C08K5/0083C08K5/098C08K5/10C08K5/1345C08K5/375C08K5/526C08K13/02
Inventor 杨俊峰王硕陈光岩杜昌明周志宇李连鹏宋尚德肖翠
Owner PETROCHINA CO LTD