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Polypropylene composition for automobile bumper and preparation method thereof

A technology of polypropylene composition and automobile bumper, which is applied in the field of automobile bumper materials, can solve the problems of small shrinkage, high cost, and large deformation, and achieve the effects of good size matching, high dimensional stability, and moderate cost

Inactive Publication Date: 2010-06-30
HEFEI GENIUS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the cost of EPDM / PP used in automobile bumpers is too high. At the same time, because the automobile bumper material is a large automobile part, the shrinkage rate needs to be small. The shrinkage rate of the EPDM / PP material system is generally between 1.3-1.6, and the deformation If it is too large, the rear shrinkage of the bumper material is very large. If the bumper needs to be sprayed, it needs to be baked. If the shrinkage rate is too large, it is not conducive to the assembly of the whole vehicle.

Method used

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  • Polypropylene composition for automobile bumper and preparation method thereof
  • Polypropylene composition for automobile bumper and preparation method thereof
  • Polypropylene composition for automobile bumper and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1～5

[0023] The materials were weighed according to the components and proportions provided in Table 1, mixed in a high-speed mixer for 15 minutes, and the temperature was controlled at 60-70° C., and then extruded by a twin-screw extruder to obtain a composition. The extrusion temperature of each stage is set at 195°C, 205°C, 215°C, 215°C, 215°C, 215°C, 225°C.

[0024] The test results are shown in Table 2.

[0025] It can be seen from Table 2 that according to the appropriate component distribution ratio and suitable processing technology, automobile bumper materials that meet the needs of various automobile manufacturers can be prepared. In the amount of added talcum powder, there are 10%, 15% , 20% of the distinction, correspondingly, if it is necessary to meet the requirements of the bumper material, it is also necessary to properly adjust the amount of the elastomer, so as to ensure the impact performance of the bumper material.

[0026] In order to ensure the molding and pr...

Embodiment 6～9

[0033] The materials were weighed according to the components and proportions provided in Table 3, mixed in a high-speed mixer for 15 minutes, and the temperature was controlled at 60-70° C., and then extruded by a twin-screw extruder to obtain a composition. The extrusion temperature of each stage is set at 195°C, 205°C, 215°C, 215°C, 15°C, 215°C, 225°C.

[0034] The test results are shown in Table 4.

[0035] The added talcum powder has an impact on the performance of the bumper. Because of its small particle size, the superfine talc powder does not change the chain structure of the resin in the branch matrix very much, so it has an impact on the elongation at break and impact properties of the resin. It is smaller than ordinary talc powder, and because ultrafine talc powder can promote the recrystallization of resin, it has a good effect on improving the rigidity of resin. It is obvious from the test results that we can prepare ultrafine talc powder High-end car bumper. O...

Embodiment 10

[0044] Weigh the materials according to the following weight ratio: polypropylene resin 50%, wollastonite and chopped glass fiber (weight ratio 1: 1) total 25%, toughening agent thermoplastic polyurethane 25%, coupling agent gamma-methacrylic acid propylene Ester silane 0.5%, antioxidant 3001%, lubricant calcium stearate and EBS (weight ratio 1: 3) altogether 1%; Mix 15 minutes in high-speed mixer, temperature is controlled at 60~70 ℃, after that The composition was obtained after extrusion with a twin-screw extruder. The extrusion temperature of each stage is set at 195°C, 205°C, 215°C, 215°C, 15°C, 215°C, 225°C.

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Abstract

The invention relates to a polypropylene composition for a automobile bumper and a preparation method thereof; the composition comprises the following material by weight proportion: 50 to 80 percent of polypropylene resin, 10 to 25 percent of inorganic filler, 9 to 25 percent of toughener, 0 to 0.5 percent of coupling agent, 0.1 to 1 percent of antioxidant, and 0.1 to 1 percent of lubricant; and the preparation method comprises preparation, mixing, extrusion and other process steps. Compared with the prior art, the composition has the advantages of high toughness, high size stability and relatively modest cost, so that the prepared automobile bumper material meets the standards of cars, can well satisfy the needs of the customers, and has very good size matching property in the complete car assembly.

Description

technical field [0001] The invention relates to automobile bumper materials, in particular to a polypropylene composition for automobile bumpers using ultrafine inorganic minerals as fillers and a preparation method thereof. Background technique [0002] At present, the amount of plastic used in each car in foreign industrialized countries has reached 200kg, accounting for 20% of the mass of the vehicle. The plastics department of General Electric Company of the United States believes that the annual growth rate of plastics in the automotive industry will reach 10%-20% in the future. In the composition of automotive plastics, Europe and Japan are relatively similar, mainly PP, accounting for about 28% of the total, of which more than 80% are used for the production of bumpers. This is not only because of low cost, but also because of its unique advantages such as light weight and recyclability, making it the mainstream of automotive bumper materials. my country started lat...

Claims

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Application Information

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IPC IPC(8): C08L23/10C08K13/02C08K13/04C08K3/34C08K3/26C08K7/14C08K3/22C08K7/20
Inventor 廖周雄
Owner HEFEI GENIUS NEW MATERIALS
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