Alumina ceramics are used to manufacture various gears, racks, worm gears, worms, bearings, cams, bolts, levers, crankshafts, ratchets, and can also be used as parts of mechanical equipment housings, covers and frames. Cups, tubes, bottles for medical purposes, dental instruments, medicine containers and surgical instruments, and even artificial organs such as artificial kidneys and artificial lungs. In construction, it is used as hollow rib double-wall panels, greenhouse glass, etc.; in the textile industry, it is used as High Precision Ceramic Network Resistor Substrate Plate textile bobbins, textile machine bearings, etc.; in daily use, it is used as milk bottles, tableware, toys, models, LED lamp housings and mobile phone housings. The purpose of modified PC is to toughen, improve molding and processing performance, reduce residual deformation, increase flame retardancy, etc. The specific types of modified PC are:
PC/ABS can improve flexural modulus, heat resistance, electroplating performance, etc.
PC/PET, PBT can improve chemical resistance, solvent resistance, etc.
PC/PMMA adding organic glass can improve the appearance of pearlescent color.
PC/PA, HIPS can improve impact toughness and surface finish.
PC/HDPE can improve boiling water resistance, aging resistance, and weather resistance, while LDPE is less effective.
PC is reinforced and modified with glass fiber or carbon fiber to improve mechanical strength.
Combined with bromine flame retardant and antimony trioxide, it can be made into flame retardant PC.
Others and polysulfone, aromatic polycarbonate, polyoxymethylene, polypropylene, polystyrene can be blended and modified to achieve a balance between High Precision Ceramic Network Resistor Substrate Plate economy and performance. For the production of polycarbonate textile bobbins, PC produced by the phosgene method is used as the raw material, of which 80% is new material and 20% is recycled material. The production process is as follows:
Ingredients → drying → injection → finishing → polishing → heat treatment → products.
The drying temperature of the oven is 115-120℃, 16-20 hours, the thickness of the material on the tray is less than 30 mm, and the resin moisture content is less than 0.03%.
The temperature of the three zones of the barrel is 200-220, 250-280, 260-290°C, and the nozzle temperature is slightly lower than that of the barrel, 5-10°C lower. The injection pressure is 60-100MPa, the molding cycle is 25 seconds, and the heat treatment temperature is 115-120°C for 1 hour. The inverted suspension type is used for heat treatment.
The bobbin has a service life three times High Precision Ceramic Network Resistor Substrate Plate longer than that of a wooden bobbin, with stable dimensions, good weather resistance, lint-free, good finish, and can provide bobbins of various colors, which is convenient for the economic calculation of the team.
For waste recycled PC materials, toughening treatment can also be carried out to replace new materials. It can be blended with a small amount of nylon resin or high-impact polystyrene resin in the recycled PC material, which can increase the impact strength of the product by more than one time, and improve the bending strength. The processing performance of the resin and the surface smoothness are improved. Improved a lot.
In addition, due to the extremely low viscosity of nylon High Precision Ceramic Network Resistor Substrate Plate during melting, it can have an excellent wetting and covering effect on the pigments in the blending system, destroying the aggregation of the pigments and increasing the dispersibility of the pigments. Therefore, the amount of pigments can be reduced. 20%.
What is the connection between alumina ceramics and machinery and equipment?
2020 11/10