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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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 b...

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Method used

The talcum powder that adds is influential to the performance of bumper, and superfine talcum powder is because its particle diameter is little, and the chain structure change of resin is not very large in branch matrix, therefore to the elongation at break of resin, Impact performance is less affected than ordinary talc powder, and because ultra-fine talc powder can promote the ...

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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.

Technology Topic

PolypropyleneChemistry +7

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Examples

Experimental program(5)

Example

[0022] Examples 1~5

[0023] Weigh the materials according to the components and proportions provided in Table 1, mix them in a high-speed mixer for 15 minutes, control the temperature at 60-70°C, and then extrude them in a twin-screw extruder to obtain the composition. The extrusion temperature of each stage was set to 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 composition ratio and appropriate processing technology, it is possible to prepare automobile bumper materials that meet the needs of various automobile manufacturers. The amount of talc added is 10%, 15% , 20% distinction. Correspondingly, if you need to meet the requirements of the bumper material, you need to adjust the amount of elastomer appropriately so that the impact performance of the bumper material can be guaranteed.

[0026] In order to ensure the molding and processing performance of the bumper, the polypropylene resin matrix needs to be adjusted appropriately to ensure the quality and fluidity to meet the molding requirements. In general, homopolymer and copolymer polypropylene can be used for mutual matching, and the bending strength and impact toughness To find a balance point, prepare the car bumper material.

[0027] Table 1 The components and proportions of Examples 1 to 5 (the following examples are all calculated by percentage)

[0028]

[0029]

[0030] Table 2 Performance of Examples 1 to 5 (ASTM)

[0031]

Example

[0032] Examples 6-9

[0033] Weigh the materials according to the components and proportions provided in Table 3, mix them in a high-speed mixer for 15 minutes, control the temperature at 60-70°C, and then extrude them in a twin-screw extruder to obtain the composition. The extrusion temperature of each stage was set to 195°C, 205°C, 215°C, 215°C, 15°C, 215°C, and 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 resin chain structure very much in the dendritic matrix, so it has an impact on the resin’s elongation at break and impact performance. It is smaller than ordinary talc, and because ultra-fine talc can promote the recrystallization of the resin, it has a good effect on improving the rigidity of the resin, etc. It is obvious from the test results that we can use ultra-fine talc to prepare Mid-to-high-end car bumpers. Other inorganic mineral fillers also have similar properties. In the implementation process, the content of the toughening agent needs to be adjusted appropriately.

[0036] Table 3 The components and proportions of Examples 1 to 5 (the following examples are all calculated by percentage)

[0037]

[0038] Table 4 Performance of Examples 6-9 (ASTM)

[0039]

[0040] Table 5 Testing standards for the performance of automobile bumper materials

[0041]

[0042]

Example Embodiment

[0043] Example 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 γ-methacrylic acid acrylic Ester-based silane 0.5%, antioxidant 3001%, lubricant calcium stearate and EBS (weight ratio 1:3) total 1%; mix in a high-speed mixer for 15 minutes, control the temperature at 60~70℃, and then The composition is obtained after extrusion by a twin screw extruder. The extrusion temperature of each stage was set to 195°C, 205°C, 215°C, 215°C, 15°C, 215°C, and 225°C.

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Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Improve toughness
Improved dimensional stability

Poly(arylene ether)-containing thermoset composition in powder form, method for the preparation thereof, and articles derived therefrom

InactiveUS20020173597A1Improve toughnessEtherPolyresin

Owner:SABIC GLOBAL TECH BV

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

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

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Examples

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Example Embodiment

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Description & Claims & Application Information

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