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Method for preparing polypropylene toughening modifier by irradiation grafting

A toughening modifier, polypropylene technology, applied in the field of polypropylene toughening and modification, can solve the problems of loss of material modulus, large consumption of elastomer, unsuitable for industrial production, etc., and achieves improved impact strength at room temperature and low temperature , good economic and social benefits, the effect of broad application prospects

Inactive Publication Date: 2015-09-02
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main method of conventional polypropylene toughening is physical blending with elastomers (EPDM, EPR, etc.), but this method consumes too much elastomer and is not suitable for industrial production. The obtained modified polypropylene products have improved toughness. At the same time, it is accompanied by a large loss of material modulus

Method used

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  • Method for preparing polypropylene toughening modifier by irradiation grafting
  • Method for preparing polypropylene toughening modifier by irradiation grafting
  • Method for preparing polypropylene toughening modifier by irradiation grafting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Mix 20% of high-density polyethylene, 10% of low-density polyethylene, 40% of propylene and ethylene block copolymer PPB, 29.95% of ethylene-octene copolymer POE, and 0.05% of antioxidant 1076 by weight percentage. The screw extruder is melted and extruded at 180°C and the melt temperature is 170°C, cooled, pelletized, and dried. The pellets are packed into packaging bags and irradiated with γ-rays. The irradiation dose is 100kGy to obtain irradiation-grafted polypropylene. toughness modifier.

Embodiment 2

[0028] 30% low-density polyethylene, 30% propylene-ethylene random copolymer PPR, ethylene-octene copolymer POE39.5%, antioxidant 1010 0.1% are mixed by weight percentage, and are mixed on the co-rotating twin-screw extruder 230°C, melt temperature 190°C, melt extrusion, cooling, pelletizing, drying, granulation, the pellets are packed into packaging bags for γ-ray irradiation, the irradiation dose is 25kGy, and the toughened and modified polypropylene grafted by irradiation is obtained. sex agent.

Embodiment 3

[0030] Mix 50% of high-density polyethylene, 15% of homopolypropylene PPH, 34.9% of ethylene-octene copolymer POE, and 0.1% of antioxidant 1135 by weight percentage, and melt at 200°C on a single-screw extruder Melt extrusion at a temperature of 180°C, cooling, pelletizing, drying, and pelletizing. The pellets were packed into packaging bags and irradiated with gamma rays at a dose of 10 kGy to obtain an irradiation-grafted polypropylene toughening modifier.

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Abstract

The invention discloses a method for preparing a polypropylene toughening modifier by irradiation grafting, which comprises the following steps: mixing polypropylene, polyethylene, ethylene-octylene copolymer (POE) and an antioxidant in percentage by weight, carrying out melt extrusion on a screw extruder, cooling, granulating, drying, adding the granules into a packaging bag, and carrying out gamma-ray irradiation to obtain the irradiation-grafted polypropylene toughening modifier. After the product is blended with an isotactic polypropylene resin, the normal-temperature / low-temperature impact strength of the isotactic polypropylene is obviously enhanced, the normal-temperature impact strength of the modified polypropylene is enhanced by 53.5-60%, the low-temperature impact strength is enhanced by 45.2-50%, the crystallization temperature of the polypropylene modified product is enhanced by 3.4-5.7 DEG C, and the crystallization rate is increased. The polypropylene toughening modifier can enhance the degree of crystallinity of the isotactic polypropylene, refine the crystal grains, reduce the phenomenon of secondary crystallization in the later storage process and eliminate the residual internal stress in the polypropylene modified product. The polypropylene toughening modifier is widely used for producing extrusion, injection molding and foaming products of polypropylene.

Description

technical field [0001] The invention belongs to the technical field of polypropylene toughening modification, in particular to a method for preparing a polypropylene toughening modifier by irradiation grafting. Background technique [0002] Polypropylene is widely used because of its high strength, good processability, light weight and low price. However, due to its high molecular chain regularity, large crystal grain size, and weak grain interface force, the material has poor performance when used at low temperature. The poor impact toughness limits its further application. Therefore, how to improve the impact toughness of isotactic polypropylene, maintain the balance of rigidity and toughness, and realize the high performance of general-purpose polymer materials has important theoretical and practical significance. The main method of conventional polypropylene toughening is physical blending with elastomers (EPDM, EPR, etc.), but this method consumes too much elastomer an...

Claims

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Application Information

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IPC IPC(8): C08L23/06C08L23/14C08L23/12C08L23/08C08K5/134B29C35/08
CPCC08L23/12B29C35/08C08K2201/014C08L2205/025C08L2205/035C08L2205/06C08L2207/062C08L2207/066
Inventor 严海彪
Owner HUBEI UNIV OF TECH
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