Composite material for automobile spoiler and preparation method thereof

Abstract

The invention provides a composite material for an automobile spoiler and a preparation method thereof, and relates to the technical field of automobile part manufacturing. The preparation method comprises the following steps of: providing secondarily treated CFRP waste; then, carrying out first melting treatment on the CFRP waste and provided ABS (Acrylonitrile Butadiene Styrene), PC (Polycarbonate), polyglycidyl methacrylate and mica powder; then providing vulcanization modified isoprene rubber and a product system of the first melting treatment, and carrying out second melting treatment to prepare a molten product; and extruding the molten product from a twin-extruder, and carrying out water cooling, bracing and granulation to obtain the composite material. The secondarily treated CFRP waste is obtained by oxidization by concentrated acid, ultraviolet irradiation and co-activation treatment together with surface treatment liquid. The preparation method provided by the invention can reduce the anisotropy of the molding shrinkage rate, improve and enhance the dimensional stability of the molded product, enhance the paint adhesion and coating performance of the surfaces of the material and the product thereof, and improve the toughness, impact resistance, heat resistance and cold resistance of the composite material.

Description

technical field [0001] The invention belongs to the technical field of auto parts manufacturing, and in particular relates to a composite material used for an auto spoiler and a preparation method thereof. Background technique [0002] The car spoiler is an additional plate installed at the rear of the car at a certain angle to the horizontal direction. When the car is running at high speed, the inclination can be used to directly generate downward pressure from the wind, reducing the aerodynamic lift at the rear of the vehicle and improving the driving stability of the car. At the same time, the spoiler can also enhance the dynamism and aesthetics of the car, reflect the personalized design, reduce the fuel consumption of the car, and reduce carbon dioxide emissions. With the rapid development of the automobile industry, the spoiler must have excellent high and low temperature impact resistance, rigidity, heat resistance, environmental stress resistance, dimensional stabil...

AI Technical Summary

Problems solved by technology

For example, PC-based materials have particularly good impact strength, thermal stability, gloss, antibacterial properties, flame retardant properties, and anti-pollution properties; the disadvantages are high hygroscopicity, easy to produce bubbles and silver wires during processing, and products are prone to residual content. Stress, high sensitivity to notch, low fatigue resistance, poor friction and wear resistance

For example, the spoiler made of high-strength PBT material can crystallize rapidly at low temperature and has good formability; the disadvantage is that the notched impact strength is low and the molding shrinkage rate is large

For example, the spoiler made of alloy material has good air diversion and heat dissipation effects, and the price is moderate; the disadvantage is that the freedom of appearance design is poor, and the weight is also heavy

For example, the FRP spoiler is made of thermosetting resin and glass fiber, which is cheap; the disadvantage is that it is brittle and has basically been eliminated

For example, the spoiler products made of polypropylene have good surface gloss, are easy to color, easy to process, have good heat resistance, stable chemical properties and water stability; the disadvantage is that the unreinforced material is soft, and the surface quality after reinforcement is poor. , and poor weather resistance

The best spoiler material is carbon fiber, which has low density, high specific performance, no creep, ultra-high temperature resistance in non-oxidizing environment, good fatigue resistance, small thermal expansion coefficient and anisotropy, good corrosion resistance, and is high The perfect combination of rigidity and high durability; the disadvantage is that the price is too expensive, and it is only suitable for high-end cars. At present, my country basically relies on imports

Combined with the function of carbon fiber, a small amount of carbon fiber composite material (CFRP) can also be added to the spoiler material to enhance its mechanical properties. CFRP has excellent properties such as light weight, high strength, and high modulus, but the waste generated is also increasing day by day , and the components in the waste CFRP (such as thermosetting resin or unsaturated resin) are not degradable, on the one hand, it will bring serious pollution to the environment, on the other hand, these waste CFRP often contain high value-added carbon fibers, and the carbon fiber Production is an energy-intensive process, and if it is not recycled, it will cause a serious waste of resources

[0004] At present, PC-ABS, ABS or ASA is the main material at home and abroad to produce automobile spoiler through injection blow molding process. This kind of material has relatively high strength, is not easy to break, has good high and low temperature performance, and is not easy to warp and deform; However, the cost of the mold is expensive, and the processing of the material is difficult, and the finished product is prone to produce residual internal stress that affects the appearance, the coating effect is poor, the fatigue resistance is low, the heat resistance is poor, the environmental stress resistance is poor, and the cost is relatively low. higher

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