Modification method for enhancing polarity and flowability of polypropylene

A polypropylene and fluidity technology, applied in the field of polymer material modification, can solve the problems of high melt viscosity, poor wettability, and difficulty in penetrating glass fiber tow, etc., to improve melt flow rate, impact resistance and mechanical properties. Excellent performance

Active Publication Date: 2011-10-05
SOUTH CHINA UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of low polarity of polypropylene, poor wettability, high melt viscosity and difficulty in soaking glass fiber strands in the production of long glass fiber reinforced polypropylene, and to provide an improved polypropylene polarity and fluidity. The invention can prepare a modified polypropylene material with excellent fluidity, compatibility, toughness and comprehensive performance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Mix 100 parts of polypropylene raw powder with a melt index of 18g / 10min (2.16kg at 230°C) with 1 part of N-phenylmaleimide, 0.5 parts of diphenylmethane bismaleimide, 1 part of phthalic Formimide and 0.05 parts of di-tert-butyl peroxide are mixed evenly, and mixed and extruded on a HAAKE Rheomex OS PTW16 twin-screw processing extruder to granulate. The extruder temperature is set to 180°C, 220°C, 240°C, 250°C, 250°C, 250°C, 250°C, 250°C, and 230°C, the head temperature is 220°C, the screw speed is 80r / min, and the feed rate 12%. Modified polypropylene pellets were mixed with 0.1 part of antioxidant 168, and injected into standard samples on Hongli P Series 50e injection molding machine. The three-stage temperature of the injection molding machine is set to 180°C, 225°C and 225°C, and the nozzle is 230°C.

Embodiment 2

[0024] Mix 100 parts of polypropylene raw powder with a melt index of 2.5g / 10min (2.16kg at 230°C) and 2 parts of N-phenylmaleimide, 0.1 part of diphenylmethane bismaleimide, 0.5 part of o-phenyl Dicarboximide and 0.3 parts of di-tert-butyl peroxide were mixed evenly, mixed and extruded on a HAAKE Rheomex OS PTW16 twin-screw processing extruder to granulate. The extruder temperature is set to 180°C, 220°C, 240°C, 250°C, 250°C, 250°C, 250°C, 250°C, and 230°C, the head temperature is 220°C, the screw speed is 80r / min, and the feed rate 12%. Modified polypropylene pellets were mixed with 0.1 part of antioxidant 168, and injected into standard samples on Hongli P Series 50e injection molding machine. The three-stage temperature of the injection molding machine is set to 180°C, 225°C and 225°C, and the nozzle is 230°C.

Embodiment 3

[0026] Mix 100 parts of polypropylene raw powder with a melt index of 18g / 10min (2.16kg at 230°C) with 1 part of N-phenylmaleimide, 0.5 parts of diphenylmethane bismaleimide, 1 part of phthalic Formimide and 0.05 parts of di-tert-butyl peroxide were mixed evenly, melted and mixed on a HAAKE Rheomex OS PTW16 twin-screw extruder, and at the same time, glass fiber strands were added to the feeding port near the head of the twin-screw extruder to granulate. The extruder temperature is set to 180°C, 220°C, 240°C, 250°C, 250°C, 250°C, 250°C, 250°C, and 230°C, the head temperature is 220°C, the screw speed is 80r / min, and the feed rate 12%. The reinforced pellets were mixed with 0.3 parts of antioxidant 168, and injected into standard samples on Hongli P Series 50e injection molding machine. The three-stage temperature of the injection molding machine is set to 180°C, 225°C and 225°C, and the nozzle is 230°C.

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Abstract

The invention discloses a modification method for enhancing polarity and flowability of polypropylene, which is realized in a way that: raw materials of polypropylene are mixed in sequence, wherein the polypropylene comprises the following raw materials in portions by mass: 100 portions of polypropylene, 0.1-10 portions of polar monomer, 0-7 portions of phase-transformation plasticizer, 0.01-1 portion of initiator and 0.1-2 portions of antioxidant; and the sequence is realized in a way that: melting and mixing the initiator and the polar monomer before the antioxidant and the polypropylene, melting and mixing the polar monomer before the initiator and the polypropylene or simultaneously melting and mixing the polar monomer and the initiator with the polypropylene. The invention greatly increases the flow rate of the polypropylene melt without obviously affecting the impact ductility of the polypropylene; the invention can prepare modified polypropylene material with favorable melt flowability, compatibility with glass fibers, heat resistance, impact resistance and mechanical properties; and the modified polypropylene material can be used as long-glass-fiber reinforced polypropylene composite materials.

Description

technical field [0001] The invention belongs to the technical field of polymer material modification, and in particular relates to the preparation of high-fluidity modified polypropylene, which can be used for long glass fiber reinforced polypropylene composite materials. Background technique [0002] Polypropylene is a common general-purpose plastic. Compared with other general-purpose plastics, it has a series of advantages such as low density, low price, easy molding, and good mechanical properties. However, the mechanical properties of polypropylene are not as good as engineering plastics, so it cannot be directly used as structural parts, which limits its application fields. In order to overcome the defect of insufficient strength of polypropylene, people use glass fiber to strengthen polypropylene to broaden its application range. After reinforced with glass fiber, the mechanical strength, impact resistance, fatigue resistance, creep resistance and heat distortion tem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L51/06C08F255/02C08K5/3417
Inventor 李建雄徐迎宾李瑶任东方刘安华
Owner SOUTH CHINA UNIV OF TECH
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