The appearance of ABS is opaque ivory granules, and its products can be made colorful and have high gloss. ABS relative density of about 1.05, low water absorption. The combination of ABS and other materials is good, easy surface printing, coating and plating treatment. ABS has an oxygen index of 18 to 20, is a flammable polymer, has a yellow flame, black smoke, and emits a special odor.
Mechanical properties ABS has excellent mechanical properties, its excellent impact strength, can be used at very low temperatures; ABS excellent wear resistance, dimensional stability, and oil resistance, can be used for bearings under medium load and speed . The creep resistance of ABS is larger than that of PSF and PC, but smaller than that of PA and POM. The bending strength and compressive strength of ABS are inferior in plastics. The mechanical properties of ABS are greatly affected by temperature.
Thermal properties ABS heat distortion temperature of 93 ~ 118 °C, after annealing products can also be improved by about 10 °C. ABS can still exhibit certain toughness at -40°C, and can be used in the temperature range of -40 to 100°C. Electrical properties ABS has good electrical insulation and is almost unaffected by temperature, humidity, and frequency and can be used in most environments.
Environmental performance ABS is not affected by water, inorganic salts, alkalis, and various acids, but it is soluble in ketones, aldehydes, and chlorinated hydrocarbons, and is subject to stress cracking due to glacial acetic acid, vegetable oils, and the like. ABS is poor in weather resistance and easily degrades under the influence of ultraviolet light; after half a year outdoors, the impact strength is reduced by half.
The processing performance of ABS plastics, like PS, is a kind of thermoplastic with excellent processing performance, and can be processed by general processing methods. A
The melt flow of BS is better than that of PVC and PC, but worse than that of PE, PA and PS, similar to that of POM and HIPS; the flow characteristics of ABS are non-Newtonian; its melt viscosity is related to processing temperature and shear rate. , but more sensitive to the shear rate.
ABS has good thermal stability and is not prone to degradation. ABS has a high water absorption rate and should be dried before processing. General product drying conditions are temperature 80~85°C, time 2~4h; drying conditions for special requirements products (such as electroplating) are temperature 70~80°C, time 18~18h. ABS products are prone to internal stress during processing. The internal stress can be inspected by immersing in glacial acetic acid. If the stress is too high and the product is absolutely prohibited for stress cracking, annealing treatment should be carried out. The specific conditions are hot air circulation at 70~80°C. Dry box 2 ~ 4h, then cooled to room temperature.
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