Properties: tasteless, odorless, non-toxic, matt surface, milky white waxy particles, density about 0.920 g/cm3, melting point 130℃~145℃. Insoluble in water, slightly soluble in hydrocarbons, toluene, etc. It can withstand the erosion of most acids and alkalis, has low water absorption, maintains flexibility at low temperatures, and has high electrical insulation.
Production process: There are two main types: high-pressure tube method and kettle method. In order to reduce the reaction temperature and pressure, the tubular process generally uses low-temperature and high-activity primers to initiate the polymerization system, using high-purity ethylene as the Thermal Expansion Ceramic Substrate Elctronic Components main raw material, propylene/propane, etc. as density regulators, and using high-activity initiators at about 200℃~ The polymerization reaction is carried out at 330°C and 150-300MPa. The molten polymer that initiates polymerization in the reactor must be cooled and separated by high pressure, medium pressure and low pressure. The high pressure circulating gas is cooled and separated and then sent to the inlet of the ultra-high pressure (300 MPa) compressor. After separation, it is sent to the inlet of the high-pressure (30 MPa) compressor, and the low-pressure circulating gas is cooled and separated and then sent to the low-pressure (0.5 MPa) compressor for recycling. The molten polyethylene is sent to the pelletizer after high-pressure and low-pressure separation. During the granulation process, the company can add suitable additives according to different application fields, and the granules are packaged and shipped.
Uses: Injection molding, extrusion molding, blow molding and other processing methods can be used. Mainly used as agricultural film, industrial packaging film, pharmaceutical Thermal Expansion Ceramic Substrate Elctronic Components and food packaging film, machinery parts, daily necessities, building materials, wire, cable insulation, coating and synthetic paper.
Properties: As the molecular structures of LLDPE and LDPE are significantly different, their performance is also different. Compared with LDPE, LLDPE has excellent environmental stress crack resistance and electrical insulation, higher heat resistance, impact resistance and puncture resistance. Production process: LLDPE resin is mainly produced by full-density polyethylene equipment. The representative production processes are Innovene process and UCC's Unipol process.
Uses: Production of films, daily necessities, pipes, wires and cables through injection molding, extrusion, blow molding and other molding methods.
Zirconia Ceramics
Properties: Natural, cylindrical or oblate particles, the particles are smooth and clean, the size of the particles should be 2 mm to 5 mm in any direction, without mechanical impurities, and with thermoplasticity. The powder is white powder, and the qualified product is allowed to have a slight yellow color. It is insoluble in general solvents at room temperature, but can swell when exposed to aliphatic hydrocarbons, aromatic hydrocarbons and halogenated hydrocarbons for a long time, and is slightly soluble in toluene and acetic acid above 70℃. Oxidation Thermal Expansion Ceramic Substrate Elctronic Components occurs when heated in the air and under the influence of sunlight. It can withstand most acids and alkalis. The water absorption is small, it can still maintain flexibility at low temperature, and has high electrical insulation.
Production process: Two production processes of gas phase method and slurry method are adopted.
Uses: using injection molding, blow molding, extrusion molding, rotational molding and other molding methods to produce film products, daily necessities and industrial use of various sizes of hollow containers, pipes, calendering and ligation tapes for packaging, ropes, fishing nets and weaving Fiber, wire and cable, etc.
What are the characteristics of alumina ceramics?
2020 11/17