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A low energy consumption, photodegradable polyethylene composition and its preparation method

A technology of polyethylene and photodegradation, which is applied in the field of polyethylene film processing, can solve the problems of rapid and effective treatment of unfavorable plastic waste, long degradation time, and increased product cost, and achieve high ability to absorb and shield ultraviolet rays, photocatalysis The effect of high activity and low cost

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this method can be degraded, its starch content is high, reaching 20-80%, which greatly increases the cost of the product, and the simple biodegradation method takes a long time to degrade, which is not conducive to the rapid and effective treatment of plastic waste. deal with

Method used

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  • A low energy consumption, photodegradable polyethylene composition and its preparation method
  • A low energy consumption, photodegradable polyethylene composition and its preparation method
  • A low energy consumption, photodegradable polyethylene composition and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Polyethylene a is a powder, and ethylene and hexene~1 are copolymerized. Its density is 0.923g / cm 3 , the melt mass flow rate (MFR) is 2.55g / 10min, the melting temperature is 122.6°C, the degree of branching is 1.9, the weight average molecular weight is 90,000, and the molecular weight distribution width index is 4.0.

[0040] Polyethylene b as pellets, metallocene linear low density polyethylene, density 0.918g / cm 3 , Melt mass flow rate (190°C, 2.16Kg) 1.0g / 10min branch point 111 / 10000C, terminal methyl group 127 / 10000C, weight average molecular weight 100,000, molecular weight distribution breadth index 3.8.

[0041] Polyethylene c is pellets, linear low density polyethylene, its density is 0.9251g / cm 3 , the melt mass flow rate (MFR) is 19.18g / 10min, the melting temperature is 122.3°C, and the relative branching degree is 1.31.

Embodiment 2

[0043] Polyethylene a is a powder, and ethylene and butene ~1 are copolymerized. Its density is 0.920g / cm 3 The melt mass flow rate (MFR) is 1.93g / 10min, the melting temperature is 121.1°C, the degree of branching is 2.2, the weight average molecular weight is 120,000, and the molecular weight distribution breadth index is 4.2.

[0044] Polyethylene b is powder, metallocene linear low density polyethylene, density is 0.9158g / cm 3 , Melt mass flow rate (190℃, 2.16Kg) 2.0g / 10min, branch point is 112 / 10000C, comonomer hexene mole percentage is 1.9%, terminal methyl group is 128 / 10000C, molecular weight distribution width Index 2~4, weight average molecular weight 100,000~150,000.

[0045] Polyethylene c is a pellet, linear low-density polyethylene, and its density is 0.9263g / cm 3 , the melt mass flow rate (MFR) is 21.6g / 10min, the melting temperature is 119.3°C, and the relative branching degree is 1.28.

Embodiment 3

[0047] Polyethylene a is a powder, and ethylene and butene ~1 are copolymerized. Its density is 0.9228g / cm 3 , the melt mass flow rate (MFR) is 2.01g / 10min, the melting temperature is 122.4°C, the relative branching degree is 2.0, the weight average molecular weight is 100,000, and the molecular weight distribution width index is 4.4.

[0048] Polyethylene b is powder, prepared by metallocene catalyst, comonomer hexene, hexene molar percentage is 2.0%, branch point is 112 / 10000C, terminal methyl group is 125 / 10000C, molecular weight distribution breadth index is 2.5, weight The average molecular weight is 115,400, the melt mass flow rate is 1.68g / 10min, and the density is 0.9196g / cm 3。 .

[0049] Polyethylene c is pellets, linear low density polyethylene, its density is 0.9280g / cm 3 , the melt mass flow rate (MFR) is 23.6g / 10min, the melting temperature is 121.5℃, and the relative branching degree is 1.27.

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Abstract

The invention discloses a polyethylene composition low in energy consumption and easy to light-degrade and a preparation method thereof, and belongs to the technical field of polyethylene film processing. The composition is prepared from the following components in parts by weight: 70-85 parts of polyethylene a, 10-30 parts of polyethylene b, 3-10 parts of polyethylene c, 0.025-0.1 parts of a phosphite ester antioxidant, 0.5-3 parts of a photosensitive degrading agent, 0.5-1 part of an auxiliary photodegradable agent and 0.05-0.3 part of a processing lubrication additive. The polyethylene composition low in energy consumption and easy to light-degrade is high in degrading efficiency, uniform in dispersion, free of additionally carrying out surface modification on the degrading agent and low in processing energy consumption; the degrading effect of the degrading agent is remarkably superior to the degrading agent of the conventional biodegrading principle; the dosage of the degrading agent is less; the film prepared from the composition has excellent tensile strength, dart drop impact strength and tear resistance.

Description

technical field [0001] The invention belongs to a polyethylene composition with low energy consumption and easy photodegradation and a preparation method thereof, and belongs to the technical field of polyethylene film processing. Background technique [0002] Plastic films are widely used, and waste plastics are increasing year by year. After plastics are discarded, it is generally difficult to recycle, and the molecules are symmetrical and stable, and antioxidants are added, so it is difficult to degrade in nature for a long time, and the continuous accumulation has caused great harm to the ecological environment. The way people deal with it is landfill, incineration, etc., but it takes a lot of material and manpower, and a large amount of poisonous gas is produced thereby causing air pollution. At present, the commonly used degradation method is to add starch to the plastic, which belongs to biodegradation. The degradation mechanism is that the material is gradually deco...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K13/02C08K5/526C08K5/098C08K3/22B29B9/06
CPCC08K2003/2241
Inventor 许平王群涛郭锐王日辉石晶
Owner CHINA PETROLEUM & CHEM CORP
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