Advanced technology industrial ceramics are white powder or granular products. It is non-toxic, tasteless, crystallinity is 80%-90%, softening point is 125-135℃, service temperature can reach 100℃; hardness, tensile strength and creep are better than low-density polyethylene; wear resistance, electricity Good insulation, toughness and cold resistance; good chemical stability, insoluble in any organic solvents at room temperature, resistant to corrosion by acids, alkalis and various salts; the film has low permeability to water vapor and air, and water absorption Low; poor aging resistance, environmental stress cracking resistance is not as good as low-density polyethylene, especially thermal oxidation will reduce its performance, so antioxidants and ultraviolet absorbers must be added to the resin to improve this deficiency. High-density polyethylene film has a lower heat distortion temperature under stress, so pay attention to it when applying it. HDPE has countless applications, ranging from reusable thin-walled beverage cups to 5-gsl cans, which consume 1/5 of domestically produced HDPE. Injection molding grades generally have a melt index of 5 to 10, and there are grades with toughness and lower fluidity and higher fluidity grades with processability. Uses include daily necessities and food thin-walled packaging; tough, durable food and paint cans; high resistance to environmental stress cracking applications, such as small engine fuel tanks and 90-gal garbage Sic Ceramic Moulds cans.
The melting point of general ceramics is 142℃, and the decomposition temperature is 300℃; the adjustable range of injection temperature is relatively large. When injection molding, the general use temperature is 180℃-230℃; because it is olefin plastic, it does not absorb water, so it does not need to be dried during production, but for product quality, it can be dried at 60℃ for 1 hour to discharge floating water; The melt viscosity is high, the flow length ratio is small, and thin-walled products may lack glue. Therefore, the gate and runner are relatively large; the product is prone to static electricity, and the surface is easy to attract. The shrinkage rate is 16‰, and the overflow value is 0.05mm. High-density polyethylene has good heat resistance and cold resistance, good chemical stability, high rigidity and toughness, and good mechanical strength. Dielectric properties and Sic Ceramic Moulds environmental stress cracking resistance are also good. Hardness, tensile strength and creep are better than low-density polyethylene; abrasion resistance, electrical insulation, toughness and cold resistance are all better, but slightly worse than low-density insulation; good chemical stability, at room temperature Under the conditions, it is insoluble in any organic solvents, resistant to corrosion by acids, alkalis and various salts; the film has low permeability to water vapor and air, and low water absorption; poor aging resistance, and environmental cracking resistance is not as good as low-density polyethylene. In particular, thermal oxidation will reduce its performance. Therefore, the resin needs to be added with antioxidants and UV absorbers to improve this deficiency. High-density polyethylene film has a lower thermal deformation temperature under stress. This should be paid attention to when applying.
What is the molecular weight of advanced ceramics?
2021 01/16