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A kind of preparation method of in-situ toughened polypropylene alloy

A polypropylene and polypropylene resin technology, which is applied in the field of in-situ toughened polypropylene alloy preparation, can solve problems such as poor interfacial compatibility, and achieve the effects of good interfacial compatibility, uniform dispersion of dispersed phase and simple preparation method.

Inactive Publication Date: 2017-09-05
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to improve the low-temperature toughness of polypropylene and overcome problems such as poor interface compatibility

Method used

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  • A kind of preparation method of in-situ toughened polypropylene alloy
  • A kind of preparation method of in-situ toughened polypropylene alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Put 15g of polybutadiene and 200ml of cyclohexane into a 500ml three-necked bottle, and at 65°C, after the high vinyl polybutadiene is completely dissolved, slowly add 3.2g of formic acid and 0.6g of polyethylene glycol into the system, After the dropwise addition, react for 0.5 hours, slowly add 3.2g of hydrogen peroxide into the system dropwise within 20min, and continue to react for 2 hours at a constant temperature. After the reaction, pour out the product, and add absolute ethanol to precipitate the solid , settle for a period of time, filter with suction, wash the product solid several times with sodium bicarbonate solution and distilled water, put it in an oven at 60°C for 12 hours in vacuum, and obtain a white tough product.

Embodiment 2

[0030] Put 15g of polybutadiene and 200ml of cyclohexane into a 500ml three-necked bottle. At 65°C, after the high vinyl polybutadiene is completely dissolved, slowly add 1.8 formic acid and 0.3g of polyethylene glycol into the system, drop After the addition, react for 0.5 hours, slowly drop 1.8g of hydrogen peroxide into the system within 20min, continue to react at constant temperature for 2 hours, after the reaction, pour out the product, add absolute ethanol to precipitate the solid, After settling for a period of time, filter with suction, wash the product solid several times with sodium bicarbonate solution and distilled water, and put it into an oven for 12 hours at 60°C to vacuum dry to obtain a white tough product.

Embodiment 3-6

[0032] The electron accelerator was used to pre-irradiate the copolymerized polypropylene, and the irradiation dose was listed in Table 1 to prepare the pre-irradiated polypropylene with macromolecular peroxide.

[0033] Copolymerized polypropylene, ethylene-propylene random copolymer (CPP) or their blends are pre-irradiated to prepare pre-irradiated polypropylene with macromolecular peroxide. The reaction extrusion grafting temperature is 200° C., the screw speed is 80 rpm, and the material residence time is 3 minutes. The ratio of pre-irradiated polypropylene materials is shown in Table 1. The copolymer polypropylene used had a melt flow rate of 2.0 g / 10 min and the CPP used had a melt flow rate of 3.0 g / 10 min.

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Abstract

The invention provides a method for preparing an in-situ toughened polypropylene alloy. In-situ grafting of high vinyl polybutadiene on polypropylene molecular chains by reactive extrusion method improves the interfacial compatibility between polypropylene and high vinyl polybutadiene. Propylene alloy prepared by reactive melt blending has the advantages of good compatibility, uniform dispersed phase and good toughening effect. The preparation method of the polypropylene alloy is simple, has no pollution to the environment, and is easy to realize large-scale continuous production. The polypropylene alloy prepared by the invention can be used in the fields of medical equipment, food packaging, pharmaceutical packaging, etc., can replace TPV thermoplastic elastomer to a certain extent, and reduce production costs. Using in-situ toughened polypropylene alloy, the notched impact strength of the product exceeds 75kJ / m2, the elongation at break exceeds 700%, and the tensile strength remains basically unchanged.

Description

technical field [0001] The invention relates to a method for preparing a polypropylene alloy, in particular to a method for preparing an in-situ toughened polypropylene alloy. Background technique [0002] As a thermoplastic with a wide range of applications, polypropylene has the characteristics of small specific gravity, low price, stable chemical properties, and high fabric filling effect. However, its high brittleness and low notched impact strength, especially at low temperatures, limit the wider application of polypropylene due to these significant shortcomings (Research on the Application of Civil Composite Materials in Civil Engineering, Science and Technology Information, 2009 ( 11): 50-54). Therefore, which way to improve the impact properties of polypropylene has become an important topic in the study of polypropylene modification. [0003] In general, there are many materials that can be used to toughen polypropylene, such as traditional rubber or elastomers, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L87/00C08L23/14C08L23/16C08L47/00C08G81/02C08J3/28
Inventor 何晓峰靳晴高杨张嫚葛铁军
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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