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Composite material for vehicle bumper and preparation method thereof

A technology for automobile bumpers and composite materials, which is applied in the field of modified polypropylene composite materials and its preparation, which can solve the problems of poor low-temperature brittleness of PP materials, poor material flow properties, and decreased rigidity and strength, and achieve good molding and processing performance , Good impact resistance, low molding shrinkage

Active Publication Date: 2011-10-19
SUZHOU HECHANG POLYMERIC MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Polypropylene material has the advantages of good comprehensive strength, processability, and cost performance, but PP material has poor low temperature brittleness, large molding shrinkage, and poor impact resistance. Therefore, it needs to be modified when used in automobile bumpers
[0004] The traditional modification methods of PP special materials for automobile bumpers are: 1) Toughening polypropylene with elastomers, such as EPDM, POE, SBS, etc., the process is relatively mature, and the main disadvantage is that the material The rigidity and strength of the material decrease, the material flow performance is not good, and the cost is high; 2) The use of nano-inorganic particles to toughen polypropylene can improve the toughness of the material and reduce the cost, but the toughening range is limited

Method used

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  • Composite material for vehicle bumper and preparation method thereof

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preparation example Construction

[0025] The specific preparation process is:

[0026] ①Raw materials are evenly mixed: according to the proportion, polypropylene, metallocene ethylene-hexene copolymer, nano-calcium carbonate, antioxidant and lubricant are mixed evenly in the mixer;

[0027] ② Mixing in the twin-screw extruder: Add the mixture obtained in step ① into the twin-screw extruder for mixing. The temperature of the twin-screw extruder is set between 170 and 220°C, and the mixture is The total residence time in the extruder is 3-8min, and the speed of the twin-screw extruder is 300-350r.min -1 ;

[0028] ③The obtained material is extruded, cooled, and pelletized to obtain composite materials for automobile bumpers.

[0029] The metallocene ethylene-hexene copolymer selected in the composite material has low crystallinity. Compared with the traditional elastomer EPDM, there is no double bond in the molecular chain, and it has higher thermal stability and anti-ultraviolet stability. As the polypropyle...

Embodiment 1

[0032] Mix 74 parts of polypropylene, 5 parts of metallocene ethylene-hexene copolymer, 20 parts of nano-calcium carbonate, 0.5 part of antioxidant and 0.5 part of ethylene bis-stearamide in a high-speed mixer, and then feed into the twin-screw Extruder, the blend is mixed in the twin-screw extruder, and the temperature of each section of the twin-screw extruder is set to 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 total residence time of the mixture in the twin-screw extruder is 3-8min, and the rotational speed of the twin-screw extruder is 330r / min; extruded and granulated, and finally the special material for automobile bumper is obtained.

Embodiment 2

[0034] 80 parts of polypropylene, 9.4 parts of metallocene ethylene-hexene copolymer, 10 parts of nano-calcium carbonate (the particle size of nano-calcium carbonate is less than 100nm, whiteness ≥ 94%, activation rate ≥ 95%), 0.4 part of antioxidant Agent and 0.2 parts of lubricant are mixed evenly in a high-speed mixer, and then fed into a twin-screw extruder, and the blend is mixed in the twin-screw extruder, and the temperature of each section of the twin-screw extruder is set to 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 total residence time of the mixture in the twin-screw extruder is 3 to 8 minutes, and 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 relates to a composite material for a vehicle bumper and a preparation method thereof. The composite material comprises the following ingredients: 60-80wt% of polypropylene, 5-20wt% of metallocene ethylene / hexene copolymer, 10-20wt% of nano calcium carbonate, 0.4-0.8wt% of antioxidant, 0.2-0.5wt% of lubricant. The preparation method comprises the following steps: uniformly mixing the ingredients according to the ratio in a mixer, mixing, extruding, cooling and dicing the mixture in a double screw extruder to obtain the composite material for the vehicle bumper. According to the invention, the polypropylene / metallocene ethylene / hexene copolymer / nano calcium carbonate composite material is prepared by using metallocene ethylene / hexene copolymer as an elastomer component and nano calcium carbonate with a particle size of less than 100nm as an enhancing toughening component, with the advantages of good impact resistance, good low temperature resistance, good weatherability, and good rigid, being capable of being sprayed, and being suitable for ornaments with high requirement of toughness such as the vehicle bumper.

Description

technical field [0001] The invention relates to a modified polypropylene composite material and a preparation method thereof, in particular to a modified polypropylene material with high toughness, high strength and low shrinkage that can be used for automobile bumpers and a manufacturing method thereof. Background technique [0002] Automobile bumper is a relatively important large-scale component in the automobile industry. Its use environment requires materials to have excellent high and low temperature impact toughness, rigidity, aging resistance, heat resistance, cold resistance, as well as oil, lubricating oil, paint and other properties. The most important of these is to have high impact toughness and good formability. [0003] Polypropylene materials are widely used in automotive plastics, especially for the preparation of automotive bumpers. Polypropylene material has the advantages of good comprehensive strength, processability, and cost performance, but PP mater...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/08C08K13/02C08K3/26C08K5/20B29C47/92B29C48/92
CPCB29C48/0022B29C48/04B29C48/40
Inventor 汪倩文宋功品
Owner SUZHOU HECHANG POLYMERIC MATERIALS
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