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Low-temperature impact-resisting polypropylene composition, its preparation method and application

A technology of polypropylene composition and low temperature resistance, which is applied in the field of polypropylene composition and its preparation, can solve problems such as the decrease of rigidity performance, and achieve the effects of improving low temperature impact toughness, improving low temperature impact performance, and increasing compatibility

Inactive Publication Date: 2012-11-28
KINGFA SCI & TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the defect that the low-temperature impact toughness of the existing polypropylene toughened by rubber elastic body is improved and the rigidity is also decreased, the primary purpose of the present invention is to provide a low-temperature impact-resistant polypropylene with excellent toughness and rigidity. Propylene composition

Method used

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  • Low-temperature impact-resisting polypropylene composition, its preparation method and application
  • Low-temperature impact-resisting polypropylene composition, its preparation method and application
  • Low-temperature impact-resisting polypropylene composition, its preparation method and application

Examples

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Embodiment 1

[0039] A low-temperature impact-resistant polypropylene composition, the preparation method of which comprises the following steps:

[0040] Weigh raw materials according to the formula in Table 1, wherein the melt flow rate (MFR) of homopolypropylene is 10g / 10min, and the melt flow rate (MFR) of copolymerized polypropylene is 20g / 10min; the elastomer is ethylene-α - Copolymers of olefins with a density of 0.870 g / cm 3 , the melt mass flow rate is 0.2g / 10min (2.16kg, 190°C), the carbon number of α-olefin is 4; the inorganic filler is talc, D50 is 5μm, D97 is 20μm; the low temperature impact resistance Modifier 1 is a ternary blend alloy of polypropylene, polyethylene and ethylene-α-olefin copolymer, the number of carbon atoms of the α-olefin is 4, and its melt flow rate is at a pressure of 2.16kg and a temperature of 230°C Under the condition of 5g / 10min, the content of ethylene segment is 20%.

[0041] Mix the raw materials evenly in the high mixer, feed from the main feedi...

Embodiment 2-7

[0043] The raw material formula of the low-temperature impact-resistant polypropylene composition of Examples 2-7 is as shown in Table 1, and its preparation steps and parameters are the same as in Example 1.

[0044]Among them, the melt flow rate (MFR) of the homopolypropylene used in Example 2 is 2g / 10min, the melt flow rate (MFR) of the copolymerized polypropylene is 10g / 10min; the elastomer is ethylene-α-olefin Copolymer, density 0.950g / cm 3 , the melt mass flow rate is 30g / 10min (2.16kg, 190℃), the carbon number of α-olefin is 10; the inorganic filler is talc powder, D50 is 20μm, D97 is 45μm; the low temperature impact resistance modification Reactive agent 2 is a ternary blend alloy of polypropylene, polyethylene and ethylene-α-olefin copolymer. The number of carbon atoms of the α-olefin is 8, and its melt flow rate is 2.16kg at a pressure of 230°C. The condition is 1g / 10min, and the content of ethylene segment is 10%.

Embodiment 3

[0045] The melt flow rate (MFR) of the homopolypropylene used in Example 3 is 20g / 10min, and the melt flow rate (MFR) of the copolymerized polypropylene is 30g / 10min; the elastomer is a copolymer of ethylene-α-olefin , the density is 0.850g / cm 3 , the melt mass flow rate is 20g / 10min (2.16kg, 190°C), the carbon number of α-olefin is 3; the inorganic filler is talcum powder, D50 is 2μm, D97 is 10μm; the low temperature impact resistance modification Reactive agent 3 is a ternary blend alloy of polypropylene, polyethylene and ethylene-α-olefin copolymer. The number of carbon atoms of the α-olefin is 3, and its melt flow rate is 2.16kg at a pressure of 230°C. The condition is 50g / 10min, and the content of ethylene segment is 40%.

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Abstract

The invention discloses a low-temperature impact-resisting polypropylene composition, its preparation method and application. The polypropylene composition is prepared from 40-80% of polypropylene, 5-30% of an elastomer, 0-40% of an inorganic filling material and 3-15% of a low-temperature impact resisting modifier. The low-temperature impact resisting modifier is a ternary blend alloy of polypropylene, polyethylene, and an ethylene-alpha-olefin copolymer. The carbon atom number of the alpha-olefin is 3-10. Specifically, the content of the ethylene chain segment is 10-40%, and under the conditions of a pressure of 2.16kg and a temperature of 190DEG C, the melt flow rate of the low-temperature impact resisting modifier is 1-50g / 10min. Adding of the low-temperature impact-resisting modifier in the invention obviously reduces the brittle-ductile transition temperature of the material, and expands the temperature range of the material when it is used as a ductile material. While the low-temperature impact-resisting toughness of the material is improved, its rigidity property is also maintained, so that the use requirements of the automobile industry can be fully satisfied.

Description

technical field [0001] The invention belongs to the field of modified plastics, and in particular relates to a low-temperature impact-resistant polypropylene composition, a preparation method and application thereof. Background technique [0002] Polypropylene composition has been widely used in the automotive industry because of its advantages of light weight, solvent resistance, easy processing and easy recycling. However, the brittle-ductile transition temperature of polypropylene composition is often high. It is characterized by brittleness, which brings great constraints to the practical application of materials, and is also a major safety hazard. Therefore, improving the low temperature impact resistance of polypropylene compositions is an urgent problem to be solved. [0003] Toughening polypropylene with rubber elastomers is one of the most common methods. In the past two decades, the research work on rubber elastomer toughened polypropylene is very extensive and in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L23/14C08L23/08C08L23/06C08L23/16C08L23/18C08K3/34
Inventor 陈锐李永华李晟罗忠富刘奇祥郑明嘉吴博
Owner KINGFA SCI & TECH CO LTD
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