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A kind of polyethylene film and preparation method thereof

A polyethylene film and polyethylene technology, applied in the field of polyethylene film, can solve problems such as complex process, high cost, and many procedures, and achieve the effects of simple preparation process, lower requirements, and wide applicability

Active Publication Date: 2021-02-02
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the technical solution disclosed in this patent application can improve the puncture resistance of the film, the method used in it is multi-layer composite, the production process has many procedures, the process is complicated, difficult to control and the cost is high

Method used

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  • A kind of polyethylene film and preparation method thereof
  • A kind of polyethylene film and preparation method thereof
  • A kind of polyethylene film and preparation method thereof

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Experimental program
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preparation example Construction

[0026] The preparation method of polyethylene film provided by the invention may further comprise the steps:

[0027] (1) polyethylene, cross-linking agent and cross-linking auxiliary agent are melt-blended to obtain mixture A;

[0028] (2) forming the mixture A into an initial membrane B, the gel content of the initial membrane B being less than 5% by weight;

[0029] (3) Carrying out high-temperature cross-linking of the initial film B to form a cross-linked film C, the gel content of the cross-linked film C is 20-85% by weight;

[0030] (4) Stretching the crosslinked film C at high temperature to obtain a polyethylene film.

[0031] In the above preparation method, the initial film B is cross-linked at high temperature, and then stretched at high temperature. On the one hand, the existence of cross-linked structure provides the possibility for polyethylene to be stretched at high temperature. On the other hand, The higher stretching temperature ensures the special high or...

Embodiment approach

[0032] In the present invention, the type of the raw material polyethylene is not particularly limited, and may be various existing polyethylenes, for example, high-density polyethylene, low-density polyethylene or linear low-density polyethylene. According to a preferred embodiment of the present invention, the polyethylene is high-density polyethylene, and its density is preferably 0.860g / cm 3 -0.965g / cm3 , more preferably 0.910-0.965g / cm 3 , more preferably 0.920-0.965g / cm 3 , most preferably 0.940-0.960g / cm 3 .

[0033] According to a preferred embodiment of the present invention, the melt index MI of the polyethylene at a temperature of 190°C and a load of 2.16kg is 0.1-100g / 10min, preferably 0.1g / 10min-50g / 10min, more preferably It is 0.5g / 10min-10g / 10min. The melt index MI is measured according to the method specified in ASTM D 1238.

[0034] The present invention does not specifically limit the type of the crosslinking agent. Preferably, the crosslinking agent is ...

Embodiment 1

[0056] This embodiment is used to illustrate the polyethylene film provided by the present invention and its preparation method.

[0057] (1) Polyethylene film formula:

[0058] The matrix resin is 100g of HDPE (MI=2.0g / 10min, melting temperature is 132.1°C, density is 0.955g / cm 3 ), the crosslinking agent is 0.65g of 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, the crosslinking aid is 1g of triallyl isocyanurate and 0.3 g tris(2,2,6,6-tetramethylpiperidinyl nitroxide) phosphite.

[0059] (2) Preparation of polyethylene film:

[0060] The above-mentioned components were melt-blended and extruded to obtain mixture A in a low-shear twin-screw extruder (length-to-diameter ratio was 18 / 1, and the rotating speed of the screw was 100 rpm, the same below). The mixing temperature is 140°C;

[0061] The mixture A was molded by tableting (the molding temperature was 140° C.) to obtain an initial film B, and the initial film B was sampled and determined to have a gel content of 0.5%...

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Abstract

The invention relates to the field of films and discloses a polyethylene film and a preparation method thereof. The infrared polarization spectrum of the polyethylene film has characteristic absorption peaks at positions of 720 cm<-1> and 731 cm<-1>, d A<parallel>(lambda) is used to represent the infrared absorption degree of the film in a wavelength position of lambda when infrared polarized light is parallel to the longitudinal direction of the film, and A<perpendicular>(lambda) is used to represent the infrared absorption degree of the film at a wavelength position of lambda when infrared polarized light is perpendicular to the longitudinal direction of the film, D<lambda> is equal to the ratio of the A<parallel>(lambda) to the A<perpendicular>(lambda), E is equal to the ratio of A<parallel>(731) to A<parallel>(720), F is equal to the ratio of A<perpendicular>(731) to A<perpendicular>(720),D<720> is equal to or larger than 0.083 and is equal to or smaller than 0.83, D<731> is equalto or larger than 0.1 and is equal to or smaller than 1, E is equal to or larger than 0.5 and is equal to or smaller than 1.8, and F is equal to or larger than 0.4 and is equal to or smaller than 1.2.The polyethylene film provided by the invention has high anti-puncture strength, does not need filling particles, and is a single-layer film instead of a multi-layer composite film. The preparation process is simple and has great industrial application prospects.

Description

technical field [0001] The invention relates to the field of films, in particular to a polyethylene film, a preparation method of the polyethylene film and a polyethylene film prepared by the method. Background technique [0002] Stretched polyethylene film is a film material obtained by stretching polyethylene (PE) resin with a special molecular structure, including uniaxially oriented polyethylene film and biaxially oriented polyethylene film. Compared with uniaxially oriented polyethylene film, biaxially oriented polyethylene film has higher requirements on raw materials, but the obtained film has higher mechanical strength, high puncture resistance and impact resistance, and can be widely used Used in packaging bags, heavy packaging bags, vacuum heat-sealing films, low-temperature packaging films, composite films, medical and sanitary products, agricultural films, etc. [0003] The Chinese document "Development of Biaxially Stretched Polyethylene Film" discloses the dev...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/06C08L23/08C08K5/14C08J3/24B29D7/01
CPCB29D7/01C08J3/24C08J5/18C08J2323/06C08J2323/08C08K5/14C08L2203/16C08L2207/062C08L2207/066C08L2312/00C08L23/06C08L23/0815
Inventor 任冬雪梁文斌赖世燿陈学连王曙光
Owner CHNA ENERGY INVESTMENT CORP LTD
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