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Alumina Ceramics:
Alumina ceramics use oxygen or peroxide as initiator to polymerize ethylene into low density polyethylene. Ethylene enters the reactor after two-stage compression, and is polymerized into polyethylene under the pressure of 100-300 MPa, temperature of 200-300°C and the action of initiator. The reactants are separated under reduced pressure, so that unreacted ethylene is recycled and melted. After adding plastic additives, the polyethylene is extruded and pelletized. There are two types of polymerization reactors: tubular reactor (tube length up to 2000 m) and tank reactor. The single-pass conversion rate of the tubular process is 20% to 34%, and the single-line annual production capacity is 100 kt. The single-pass conversion rate of the kettle-type process is 20%-25%, and the single-line annual production capacity is 180 kt. There are three types: slurry method, solution method and gas phase method. Except for the solution method, the polymerization pressure is below 2 MPa. The general steps include catalyst preparation, ethylene polymerization, polymer separation and granulation.
①The polyethylene produced by the slurry method is insoluble in solvents and is in a slurry state. The slurry method has mild polymerization conditions and is easy to operate. Alkyl aluminum is commonly used as activator, hydrogen is used as molecular weight regulator, and tank reactors are mostly used. The polymer slurry from the polymerization tank is passed through the flash tank and the gas-liquid separator to the powder dryer, and then to granulation. The production process also includes steps such as solvent recovery and solvent refining. Different polymerizers can be combined in series or in parallel to obtain products with different molecular weight distributions. ②Solution method The polymerization is carried out in a solvent, but both ethylene and polyethylene are dissolved in the solvent, and the reaction system is a homogeneous solution. The reaction temperature (≥140℃) and pressure (4~5MPa) are relatively high. It is characterized by short polymerization time and high production strength. It can produce polyethylene with high, medium and low density at the same time, which can better control the properties of the product; but the polymer obtained by the solution method has low molecular weight, narrow molecular weight distribution, and solid matter The content is low.
properties: High hardness, high strength, wear resistance, corrosion resistance, high temperacture (1600°), good thermal diffusivity, good insulativity, low cost etc.
Data Sheet↓
Color: White/Ivory Density: 3.9g/cm3 Alumina Content: 96% 99% 99.5% Gas permeability: 0 Water Absorption: 0 MONS' Hardness: 82 Vickers Hardness (Hv50): 15.7(1600) Gpa(Kg/mm²) Flexural Strength(20°C): 330Mpa Compressive Strength(20°C): 2000Mpa Fracture Toughness (20°C): 4 MPam1/2 Thermal Conductivity(20°C): 27.5W(m.K) Thermal Expansion Coefficient: 7.6 10-6/°C Thermal Shock Resistance: 200 △T°C
Maximum use temperature 1650°C
Dielectric Strength: >10 KV/mm
Dielectric Constant: 9.1er
Dielectric Loss Angle(1MHz): 0.0002-0.0003
Volume Resistivity(20°C): >1014Ω.cm
Application industry: Machinery, electronic, chemical, petroleum etc. Specific application: Electrical ceramic substrate, plunger, sealing ring etc.
Why Choose Us? 1.12 years of professional production industrial ceramics factory 2.High quality products with low price 3.High precision parts with lowest tolerance 4.Short time for production 5.Has a group of experienced, professional and efficient R&D team 6.Has a good reputation in China and abroad. 7.MOQ is not limited, small quantity is welcome.
8.Vigorous team and good after-sales service
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