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The main applications of modified plastics in the automotive industry are divided into the following categories: interior parts, such as instrument panel components, cockpit, column, door panel and central control box; Such as bumper assemblies, grilles, spoilers and rubbing strips; structural components such as front end modules, seat frames and radiator fans; hood internal components such as hood, camshaft cover, canister, Intake manifolds and air filters, etc.; electrical and electronic components, such as fuse boxes, junction boxes and ignition coils.
In 2011, the sales of plastics for plastics vehicles for men and women exceeded 160,000 tons, accounting for more than 25% of the total amount of modified plastics for blondes. Its modified plastic varieties are: polyolefin products, such as modified polypropylene, modified polyethylene; engineering plastics and alloy products, such as ABS, AES, ASA, PC, PA, PBT, PET, PC/ABS, PC /PET, PC/PBT and PA/ABS; glass fiber reinforced materials such as GF-PP, GF-PA6, GF-PA66, GF-PBT and GF-PC; long glass fiber reinforced materials such as LFT-PP, LFT -PA6, LFT-PA66; special engineering plastics include PPO, PPS and PA-10T.
New technology for automotive materials
Lightweight and environmental protection are the eternal pursuit of the development of the automotive industry. The development direction of automotive materials is shown in Figure 1. The core is environmental protection, lightweight, safe and reasonable cost. The inner ring is the development requirement of the part, and the outer ring is the corresponding development requirement for the material. It can be seen that material properties and use are important to the overall development of the car. The following is mainly discussed from the development of several materials.
Figure 1 Development direction of automotive materials
1. Thin walled bumper material development
The thinning of auto parts has three advantages: one is to reduce the quality of parts; the other is to shorten the forming cycle, save costs and improve the efficiency of processing injection; the third is to reduce energy consumption. According to "Nikkei Automotive Technology", Japan's Mazda has cooperated with Japan Polypropylene Co., Ltd. to develop a new generation of bumper materials on the CX-5 model. The weight of the car can be reduced by about 20%, and the forming cycle is shortened from about 60s to 30s. At the same time, the energy consumed in the production process is greatly reduced.
After 10 years of design and material improvement, the wall thickness of the car bumper gradually developed from 4mm in the early 21st century to 2.8-3mm in 2010. At present, the bumper design of some new models has reached 2mm, which has higher requirements on materials: on the one hand, the material has high melting index, high rigidity and high impact characteristics; on the other hand, the wall thickness of the workpiece is reduced. Under the conditions, it is also necessary to meet the test requirements such as the collision of parts. In addition, the material must meet the processing performance requirements during processing.
After two years of technical research, our company successfully developed the ABP-2040, a special material for thin-walled bumpers, and successfully applied it on a certain model. Typical physical properties are shown in the attached table.
Physical properties of ABP-2040 
2. Free development of plastic coating with metallic luster
In order to achieve the beauty and luxury of interior and exterior trims, many decorative parts have been painted and painted to achieve a different metallic effect. However, for the painted parts, the appearance can meet the requirements, but the painting process has some shortcomings: if it is necessary to establish a spraying production line, the spraying process is complicated, the number of processes is large, the VOC (volatile organic compound) is polluted, the cost is high, and the defective product is difficult. Recycling, paint stripping defects, etc. If you can directly inject parts with a paint-like appearance and achieve a spray-free process, you have an advantage. The advantages are simple process, one injection molding; environmental protection, no VOC (volatile organic compounds); cost saving, easy recycling.
After several years of research and development, Blonde Technology has developed PMMA/ABS alloy, ABS and PP series of paint-free metal gloss products. Figure 2 is a PP-type swatch and a partially enlarged photo showing the flashing light that appears in black. This effect can also be achieved in other colors.
Figure 2 Paint-free metallic luster PP sample and partial enlarged photo
Figure 3 shows a product of a model that was commercialized in 2012 without paint-painted metallic luster PP. Its appearance can achieve the effect of the sprayed parts.
Figure 3 Samples of paint-free metallic luster PP
3. High temperature resistant modified nylon
Modified nylon is a commonly used plastic product for automotive materials to replace steel. The PA66-G35 HS material was developed by Blonde Technology for the replacement of automotive engine parts. The material is characterized by long-term heat resistance. Figure 4 shows the tensile strength of the material and ordinary PA66-G35 as a function of time at 210 ° C and 180 ° C, respectively.
Figure 4 Tensile strength versus time at 180 ° C and 210 ° C
1.210°CPA66-G35 2.210°CPA66-G35HS
3.180°CPA66-G35 4.180°CPA66-G35HS
It can be seen that the tensile strength of PA66-G35 HS can be maintained above 50% at 210 ° C for about 2000 h, while the mechanical properties of ordinary PA66-G35 materials have basically decayed to zero. After being stored at 180 ° C for 4000 h under the same conditions, the tensile strength was not substantially attenuated. This means that the material has excellent long-term heat resistance and is particularly suitable for engine peripheral parts or other parts that require long-term use at higher temperatures.
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