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1. The material of the armrest's jacket is very important The armrest has the function of anti-slip and anti-sweat. With these effects in mind, the design of the armrest jacket uses a polyvinyl chloride thermoplastic elastomer. Polyvinyl Chloride thermoplastic elastomer is actually an extended product of soft PVC with near-rubber performance. Compared with soft PVC, TPVC has the following advantages: small permanent compression deformation, large resilience, high bending fatigue strength, excellent wear resistance, high degree of freedom of coloration, excellent ozone resistance, excellent processability, and glossiness of products.
The reason for choosing TPVC is that it has good weather resistance, aging resistance, oil resistance, ozone resistance and chemical resistance, and the price of PVC thermoplastic elastomer is low, which meets the requirements of armrest jackets. In addition, in order to improve the anti-slip performance, the teeth are specially designed to make the user more comfortable and safe to use. The processing technology uses injection molding. The efficiency of injection molding is high, the molding operation method is relatively simple, the loss of raw materials is small, and it is suitable for mass production, and the product quality is stable. The toothed armrest coat is more complex and simple to use for injection molding operations.
2, the scooters bracket must be sturdy skateboard support, also known as the skateboard bridge, the bridge plays a role in the performance of the skateboard can not be ignored. Therefore, the use of high-strength chrome-plated steel pipe - ferritic 1Gr17 steel pipe, the steel density of 7.70kg/dm3, relatively small density, excellent mechanical properties to meet its high-strength requirements, and the low cost of steel pipe. The processing technology adopts the cold rolling forming method and presses the steel at room temperature. This method has good rolling plasticity, precise dimensions, smooth surface, high mechanical strength, large resistance to cold rolling deformation, and small deformation. The steel pipe is plated with a layer of metallic chromium and has a bright decorative effect. The chrome plating layer has good high temperature wear resistance, not only fully meets the rolling tube requirements, but also has a long life. The arc welding method is used for welding between the steel pipe and the steel pipe.
3, the board to be aging scooters have higher requirements on the board surface. Initially decided to use ABS plastic, ABS plastic is a thermoplastic with a good overall performance, but poor weather resistance, not suitable for outdoor sports, it does not meet the requirements of the scooters board. After consulting the data, ASA Plastic was finally selected. ASA plastic is an opaque yellow amorphous polymer, odorless and tasteless, flame-retardant in itself; lightweight, relative density of 1.05 ~ 1.09; high strength, good resistance to environmental stress cracking, notch impact strength of 480 ~ 580J/m, tensile strength is 38~48MPa; can be used at -20~75°C for a long time, and has good high temperature resistance; chemical resistance is good. Compared to ABS, the introduction of acrylate rubber without double bonds replaces butadiene rubber, so the weather resistance has been substantially improved, not only can resist degradation, aging, and fading caused by ultraviolet irradiation, but also can be resistant to processing. The role of hot oxygen to prevent decomposition and discoloration is precisely because ASA is about 10 times more durable than ABS, and it is one of the best weather resistant varieties in plastics. Its aging resistance is more than 10 times higher than that of ABS. Products can be used directly outdoors without surface protection such as painting and plating. Exposure to sunlight for 15 months, the impact strength and elongation at break almost unchanged, no change in color.
The outstanding advantages of ASA are: ASA's good coloring, good weatherability, and no discoloration when dyed in various colors. ASA is also a kind of self-antistatic material, which can make the product surface with less dust and meet the cleanliness requirements of the scooters. ASA's molding processing performance is good, can be injection molding, extrusion, blow molding, compression molding, machining, welding, bonding and thermoforming. The structure of the board structure of the scooter is simple, and it belongs to a small product. Therefore, the general injection molding is selected. This method has the advantages of small raw material loss and simple operation. At the same time, the molded product can simultaneously obtain a bright color appearance, eliminating the need for secondary processing. Processing. The injection temperature of ASA is 240~260°C, the injection pressure is 80~100MPa, and the mold temperature is 50~85°C.
4, the wheel to wear scooters on the performance of the wheel is also relatively high. Polyamide elastomers, TPA, are used here.
TPA has actually been far from the performance of rubber, lack of flexibility, and retained the advantages of PA: strong toughness, chemical resistance and wear resistance, has a very good sound-absorbing function, in line with the requirements of skateboard wheels. Compared with other thermoplastic elastomers, polyamide-based lipid elastomers have less density, lighter weight, and are easy to process and form. They have a wide range of hardness variations and can reach hardnesses that other elastomers cannot achieve. TPA has excellent mechanical strength, tensile strength, toughness, good wear resistance, good impact resistance and low temperature influence. It hardly changes in organic acids and organic solvents at temperatures below 80°C in warm water or at room temperature. TPA has good processing performance, specifically: good processing stability, easy to cut the material, eject and mold release, produce less flash, molding cycle is short, good dimensional stability. However, polyamide-polyester elastomers have the disadvantage of relatively high cost, so injection molding methods with relatively small losses of raw materials are used.
5, brake device can not be less brake device for the front brake. The material in this section is phenolic plastic. Bakelite is the oldest variety in plastics and is still widely used today. Phenolic resin plastics are thermosetting plastics, which have high mechanical strength, better creep resistance than thermoplastics, high rigidity, hard wear resistance, stable product size, easy molding, small shrinkage during molding, less cracks, heat resistance and chemical resistance. Drug models, low cost and price.
Suitable for casting molding methods. Casting process is simple, low cost, can produce large products, suitable for large mobility and shrinkage of plastic.
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