Study On Property And Extrusion Molding Of Wide Chlorinated Polyethylene Waterproof Roll Used For High-Speed Rail

The article was to manufacture wide chlorinated polyethylene waterproof rolls used for high-speed rail. Its width should be more than 4m and properties indexes are excellent. The influence of CPE, inorganic filler, vulcanizator, heat stabilizer, plasticizer and reinforcing agent on mechanical, processing, and heat-resistant aging properties of CPE waterproof rolls were investigated by using omnipotence material experimental machine, FITR, TGA, Torque Rheometer, SEM etc. The appropriate formula was got by choosing the types and content of CPE and additives. Then, through investigating the effect of using high-speed mixer, comparing open mill with internal mixer and two-screw extruder with open dies, the pelletizing times of two-screw extruder and processing temperature on mechanical and processing properties of CPE waterproof rolls, the appropriate machine and processing parameters were got and high strength wide CPE waterproof rolls was manufactured. The results of research were as followed:The fourth types of CPE was appropriate, the strength and elasticity of which is the maxes; compared with heavy calcium carbonate, the particle size of heavy calcium carbonate was smaller and the specific surface area was bigger, which was better than light calcium carbonate for reinforcing rolls; The most appropriate amount of DCP was 0.4pbw; Light magnesium-oxide was good for mechanical properties, but not be useful for proof aging; Chlorinated paraffin could increase roll's strength, but its migration and loss were the main favors of thermal aging. The most appropriate amount was 15pbw; Compared with white carbon black, carbon black was a better kind of reinforcing agent; High-speed mixer was needful; Open mill was better than internal mixer and two-screw extruder with open die, which cound be good for getting out gas and Volatile small molecules from waterproof rolls; Extrusion pelletizing was needful for extrusion molding;The temperature could influence processing viscosity,180℃was the best; In the air aging experoments, its'life cycle was estimated to be about 59 years at 40℃.