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Material for vehicle bumper and preparation method thereof

A technology for automobile bumpers and antioxidants, applied in bumpers and other directions, can solve the problems of large molding shrinkage, poor low-temperature brittleness, and poor impact resistance, and reduce molding shrinkage, improve strength, toughness, and product performance. excellent effect

Inactive Publication Date: 2010-04-14
SUZHOU HESHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PP has poor low-temperature brittleness, large molding shrinkage, and poor impact resistance. Therefore, it needs to be modified when used in automobile bumpers.

Method used

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  • Material for vehicle bumper and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0023] The specific preparation process is: 1) Mix the raw materials evenly: mix polypropylene, saturated ethylene-octene copolymer, polypropylene grafted maleic anhydride copolymer, nucleating agent, antioxidant and lubricant at high speed according to the proportion Mix uniformly in the machine; 2) calcium sulfate whisker feeding: calcium sulfate whisker is added from the side feeding port of the twin-screw extruder; 3) mixing in the twin-screw extruder: the mixture obtained in step 1) Add it into the twin-screw extruder for mixing. The temperature of the twin-screw extruder is set between 170-220°C. The total residence time of the mixture in the twin-screw extruder is 3-8min. The speed of the twin-screw extruder At 300~350r.min -1 ; 4) cooling and pelletizing the obtained material after being extruded to obtain the material for automobile bumper.

[0024] Saturated ethylene-octene copolymer with low internal cohesion energy is used as the toughening agent of the system. Th...

Embodiment 1

[0026] Mix 54 parts of polypropylene, 5 parts of saturated ethylene-octene copolymer, 10 parts of polypropylene grafted maleic anhydride copolymer, 0.2 part of nucleating agent, 0.6 part of antioxidant and 0.2 part of ethylene bis stearamide Mix evenly in the machine, 30 parts of calcium sulfate whiskers are added from the side feed of the twin-screw extruder, and then the blend is mixed in the twin-screw extruder, and the temperature setting of each section of the twin-screw extruder for T 1 =170°C, T 2 =180°C, T 3 =190°C, T 4 =205°C, T 5 =210°C, T 6 =220°C, the rotational speed of the twin-screw extruder is 330r / min; extrude and granulate, and finally obtain the special material for automobile bumper.

Embodiment 2

[0028] Mix 69 parts of polypropylene, 5 parts of saturated ethylene-octene copolymer, 15 parts of polypropylene grafted maleic anhydride copolymer, 0.1 part of super nucleating agent HPN-68L, 0.4 part of antioxidant and 0.5 part of lubricant Mix evenly in the machine, 10 parts of calcium sulfate whiskers are added from the side feed of the twin-screw extruder, and then the blend is mixed in the twin-screw extruder, and the temperature setting of each section of the twin-screw extruder for T 1 =170°C, T 2 =190°C, T 3 =195°C, T 4 =200°C, T 5 =205°C, T 6 = 210°C, the rotational speed of the twin-screw extruder is 300r / min; finally extruded and granulated to finally obtain special materials for automobile bumpers.

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Abstract

The invention provides a material for a vehicle bumper and a preparation method thereof. The material comprises the following components in proportion: 49-69 percent of polypropylene, 5-25 percent of saturated ethylene-octene copolymers, 10-30 percent of calcium sulphate whiskers, 5-15 percent of maleic anhydride grafted polypropylene copolymers, 0.1-0.2 percent of nucleating agents, 0.3-0.6 percent of antioxygen and 0.2-0.5 percent of lubricating agents. The preparation method comprises the following steps: firstly uniformly mixing all the components except the calcium sulphate whiskers in a mixer according to the proportion; adding the calcium sulphate whiskers from a side feeding hole; and mixing the mixture in a double-screw extruder, extruding, cooling and pelletizing. Through modifying the polypropylene, the intensity and the tenacity thereof can be enhanced and the molding shrinkage rate of the polypropylene can be reduced; the prepared modified polypropylene material is applied on the vehicle bumper and has excellent product performance.

Description

technical field [0001] The invention relates to a polypropylene material, in particular to a modified polypropylene material used for automobile bumpers and a manufacturing method thereof. Background technique [0002] Automobile bumper is a thin-walled large-scale structural part with large surface area and complex shape. It not only requires excellent high and low temperature impact toughness, rigidity, aging resistance, heat resistance, cold resistance, but also oil and lubricating oil resistance. , paint and other properties. The most important of which is to have high impact toughness and good processing flow properties. [0003] Polypropylene (PP) has the advantages of low density, easy molding and processing, and recyclability. Its application in automobiles is increasing, especially in the preparation of automobile bumpers. It is the largest and fastest-growing plastic in automobiles. types of plastic. However, PP has poor low-temperature brittleness, large moldin...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/08C08L51/06C08K13/04C08K7/08C08K3/30B29B9/06B29C47/92B60R19/03B29C48/92
CPCB29C48/04B29C48/92B29C2948/9259B29C2948/92704B29C2948/92885B29C2948/92895
Inventor 汪倩文武俊
Owner SUZHOU HESHENG NEW MATERIALS
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