Preparation method of maleic acid grafted polypropylene beneficial to inhibition of polypropylene degradation

Abstract

The invention belongs to the field of high molecular material modification, and particularly relates to a preparation method of maleic acid grafted polypropylene beneficial to inhibition of polypropylene degradation. Firstly, maleic acid and soluble rare earth inorganic salt react to obtain a maleic acid complex, secondly, the obtained maleic acid complex is mixed with polypropylene raw materials,antioxidants and initiators, and melt extrusion is performed to obtain the grafted polypropylene. Degradation of the polypropylene in the melt extrusion process can be decreased, and the grafting ratio of polypropylene chains is increased.

Description

technical field

[0001] The invention belongs to the field of polymer material modification, and in particular relates to a preparation method of maleic acid grafted polypropylene which helps to inhibit the degradation of polypropylene. Background technique

[0002] Polypropylene has excellent comprehensive properties and is a general-purpose polymer material with a wide range of uses. However, due to the poor compatibility of polypropylene with polar materials, some methods are needed to improve the polarity of polypropylene. A common modification method is to graft certain monomers onto polypropylene molecular chains. Among them, the melt grafting method is simple and economical to operate, suitable for industrial production, and is currently the main modification method.

[0003] The process of melt grafting is: after the peroxide initiator is decomposed, primary free radicals are generated, and the primary free radicals attack the main chain of polypropylene to generate...

Examples

Embodiment 1

[0016] (1) 116 parts by weight of maleic acid are dissolved in 600 parts by weight of ethanol, and 260.4 parts by weight of cerium nitrate Ce (NO 3 ) 3 ·6H 2 The salt solution formed by dispersing and dissolving O in 400 parts by weight of ethanol was added dropwise thereto, and after the dropwise addition was completed, the system was heated to 78°C for agitation and reflux reaction and was generated by a precipitate, filtered after 2 hours of reaction, and the filter cake was After the precipitate is fully washed, it is fully vacuum-dried at 75° C. to obtain a maleic acid complex of rare earth cerium (and immediately used in step (2) for preparation),

[0017] Samples were taken from the product for elemental analysis and infrared spectrum characterization, which proved that both cerium and organic ligands existed in the product;

[0018] (2) The compound obtained in step (1), polypropylene raw material (Maoming Petrochemical, EPS30R), antioxidant 1010, initiator dicumyl p...

Embodiment 2

[0020] (1) with embodiment 1;

[0021] (2) The compound obtained in step (1), polypropylene raw material (Maoming Petrochemical, EPS30R), antioxidant 1076, initiator dicumyl peroxide are in the weight ratio of 12:100:0.4:0.9 to high After mixing in the mixer for 12 minutes, the obtained mixture was added to an extruder, melted and extruded at 195° C. (the rotation speed of the extruder was 95 rpm), and granulated to obtain a grafted polypropylene product.

technical field

[0001] The invention belongs to the field of polymer material modification, and in particular relates to a preparation method of maleic acid grafted polypropylene which helps to inhibit the degradation of polypropylene. Background technique

[0002] Polypropylene has excellent comprehensive properties and is a general-purpose polymer material with a wide range of uses. However, due to the poor compatibility of polypropylene with polar materials, some methods are needed to improve the polarity of polypropylene. A common modification method is to graft certain monomers onto polypropylene molecular chains. Among them, the melt grafting method is simple and economical to operate, suitable for industrial production, and is currently the main modification method.

[0003] The process of melt grafting is: after the peroxide initiator is decomposed, primary free radicals are generated, and the primary free radicals attack the main chain of polypropylene to generate...

Examples

Embodiment 1

[0016] (1) 116 parts by weight of maleic acid are dissolved in 600 parts by weight of ethanol, and 260.4 parts by weight of cerium nitrate Ce (NO 3 ) 3 ·6H 2 The salt solution formed by dispersing and dissolving O in 400 parts by weight of ethanol was added dropwise thereto, and after the dropwise addition was completed, the system was heated to 78°C for agitation and reflux reaction and was generated by a precipitate, filtered after 2 hours of reaction, and the filter cake was After the precipitate is fully washed, it is fully vacuum-dried at 75° C. to obtain a maleic acid complex of rare earth cerium (and immediately used in step (2) for preparation),

[0017] Samples were taken from the product for elemental analysis and infrared spectrum characterization, which proved that both cerium and organic ligands existed in the product;

[0018] (2) The compound obtained in step (1), polypropylene raw material (Maoming Petrochemical, EPS30R), antioxidant 1010, initiator dicumyl p...

Embodiment 2

[0020] (1) with embodiment 1;

[0021] (2) The compound obtained in step (1), polypropylene raw material (Maoming Petrochemical, EPS30R), antioxidant 1076, initiator dicumyl peroxide are in the weight ratio of 12:100:0.4:0.9 to high After mixing in the mixer for 12 minutes, the obtained mixture was added to an extruder, melted and extruded at 195° C. (the rotation speed of the extruder was 95 rpm), and granulated to obtain a grafted polypropylene product.

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