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Method for preparing low-temperature flexible random copolymerization polypropylene product

A technology of random copolymerization and low-temperature toughness, applied in the field of toughened polypropylene, which can solve the problems of unsatisfactory low-temperature toughness and achieve good rigidity, low production cost and simple operation process

Inactive Publication Date: 2010-11-24
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these methods can obtain higher quality (balanced toughness and rigidity) copolymerized polypropylene when the comonomer content is lower than 4%, there are still low temperature toughness that is not ideal (below 5°C, the impact strength is lower than 10KJ / m 2 )Shortcomings

Method used

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  • Method for preparing low-temperature flexible random copolymerization polypropylene product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] First, 100 parts of random copolymerization polypropylene resin containing <4% ethylene monomer, 5 parts of rare earth β nucleating agent WBG are pre-mixed and then added to the twin-screw extruder. ℃, 170°C, 200°C, 200°C, 200°C, 195°C, the same below, abbreviated) to obtain β-nucleating agent master batch by melt blending, extruding, cooling, and pelletizing; 10 parts of β-nucleating agent prepared Agent masterbatch, 100 parts of random copolymerized polypropylene resin containing <4% ethylene monomer and 0.1 part of antioxidant 1010 are premixed and added to the twin-screw extruder at a temperature of 120 to 200 °C (the temperature of each zone is 120 ℃, 170°C, 200°C, 200°C, 200°C, 195°C, the same below, abbreviated), melt blending, extrusion, cooling, and pelletizing to obtain random copolymerized polypropylene modified pellets; the prepared random The copolymerized polypropylene modified pellets are injection-molded at 220°C into products; the molded products are an...

Embodiment 2

[0025] 100 parts of random copolymerized polypropylene resin containing <4% ethylene monomer and 5 parts of rare earth β nucleating agent WBG are pre-mixed and then added to the twin-screw extruder, melt blended and extruded at a temperature of 120-200 ° C , cooling, and pelletizing to obtain the β-nucleating agent masterbatch; 5 parts of β-nucleating agent masterbatch, 100 parts of random copolymerized polypropylene resin containing <4% ethylene monomer and 0.4 part of antioxidant 1076 were prepared After mixing, put it into a twin-screw extruder, melt and blend, extrude, cool, and pelletize at a temperature of 120-200°C to obtain random copolymerized polypropylene modified pellets; the obtained random copolymerized polypropylene modified pellets The materials are injection molded into products at 220°C; the molded products are annealed at a temperature of 120°C for 6 hours, and after taking them out, they can be placed at room temperature for more than 48 hours.

Embodiment 3

[0027] First, 100 parts of random copolymerized polypropylene resin containing <4% ethylene monomer and 5 parts of rare earth β nucleating agent WBG are pre-mixed, then added to the twin-screw extruder, and melt-blended and extruded at a temperature of 120-200 ° C , cooling, and pelletizing to obtain a β-nucleating agent masterbatch; 2 parts of β-nucleating agent masterbatch, 100 parts of random copolymerized polypropylene resin containing <4% ethylene monomer and 0.2 part of antioxidant 1010 were prepared After mixing, put it into a twin-screw extruder, melt and blend at a temperature of 120-200°C, extrude, cool, and pelletize to obtain random copolymerized polypropylene modified pellets; the obtained random copolymerized polypropylene modified pellets The material is injection molded at 230°C to form a product; the molded product is annealed at a temperature of 110°C for 2 hours, and after taking it out, it can be placed at room temperature for more than 48 hours.

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Abstract

The invention discloses a method for preparing a low-temperature flexible random copolymerization polypropylene product, which comprises the following steps of: melting and blending 100 parts of random copolymerization polypropylene resin containing less than 4 percent of ethylene monomers and 5 parts of beta nucleating agent to prepare a beta nucleating agent master batch; melting and blending 2 to 10 parts of beta nucleating agent master batch, 100 parts of random copolymerization polypropylene resin containing less than 4 percent of ethylene monomers and 0.1 to 0.5 part of antioxidant to prepare random copolymerization polypropylene modified aggregates, and performing injection molding on the aggregates to form a product; and finally, annealing the product at the temperature of 90 and 120 DEG C for 1 to 12 hours, and placing at the room temperature for over 48 hours. The product prepared by the method has the balanced mechanical property and can maintain excellent rigidity while improving low-temperature toughness substantially, so the method provides the new technology for the preparation of copolymerization polypropylene products of products such as tubular products, electrical and electronic equipment, home appliances, automobiles and the like which have the excellent low-temperature toughness.

Description

technical field [0001] The invention belongs to the technical field of methods for toughening polypropylene, and in particular relates to a method for obtaining modified random copolymerized polypropylene (PPR) products with good low-temperature toughness. Background technique [0002] Although polypropylene (PP) resin is a kind of widely used general-purpose plastic, it not only has rich sources of raw materials, light weight, and high cost performance, but its products also have excellent mechanical properties, thermal properties, chemical corrosion resistance, and processing properties. It is widely used in all aspects of the industrial field. However, due to the disadvantages of poor low temperature toughness and strong notch sensitivity of pure PP, its application in a wider range of fields is greatly limited. [0003] PP is a semi-crystalline polymer with various crystal forms, including α, β, γ, δ and pseudo-hexagonal crystals. During processing, PP mainly exists in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08K5/20C08K5/134C08K5/526C08J3/22B29C45/78B29C71/02
Inventor 傅强罗锋王柯汪金文张琴邓华陈枫
Owner SICHUAN UNIV
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