Flurocarbon resin is a kind of engineering plastic with excellent performance. Its chemical resistance and electric insulation is the best among plastics and its property will not change whether under high temperature or low temperature, the price, however is a bit too high. […]
The commonest plastic that can be found in daily life is polyethylene ( PE ) which is polymerized from ethylene industrially fractionated petroleum. […]
Polypropylene is closely connected with polyethylene with respect to raw materials, manufacturing technique as well as properties. The raw materials, i.e. propylene and ethylene, are both contained in a large amount in the decomposing gas of petroleum. […]
Acetone works together with prussic acid to form cyaniding propyl alcohol which is dehydrated with oil of vitriol, the substance is further combined into methacrylates through reaction with alcohol ester, and finally through polymerization with catalyzer, PMMA is thereby got. […]
The aggregation of stryrene monomer,acrylonitrile monomer and butadiene rubber can produce a polymer (ABS) constituted by acrylonitrile ( A ), butadiene rubber ( B ) and styrene ( S ) in various proportions. The characteristic thereof, due to the ingenious combination by the three components, shows such features as high impact resistance, large tensile strength [...]
The composite ethylene gas made from benzene( adopted from coal tar or petroleum) and ethylene gas, is dehydrogenated by metal oxide catalyzer heated to 600 celsius degree into styrene monomer, which is then catalyzed and aggregated into polystryreneresin through such catalyzer as inorgranic peroxide. The polystyrene resin in the market is colorless and transparent, hard [...]
when the temperature is between vitrification temperature and viscous flow temperature, the polymer shall be under highly-elastic state, […]
but when the temperature is below the vitrification temperature, the polymer is under glassy state, which is hard solid, wherein energy from the molecular thermodynamic movement is low, […]
I want to tell you something about condition for injection and molding, the large molecular structure of polymer and the features of molecular thermodynamic movement have determined that polymer has such states of aggregation as the glassy state, highly-elastic as well as viscous flow state etc. […]
Rust prevention for the slot or channel should be taken into account, structure of the slot and channel should be designed for the convenience of cleaning. […]