Minda yogwiritsira ntchito ndi chiyembekezo cha chitukuko cha zotanuka polyurethane zipangizo

Ma polyurethane elastomers ali m'gulu la ma polima, ndiko kuti, ma macromolecules a polyurethane amapangidwa ndi "zigawo zofewa" ndi "zigawo zolimba" ndikupanga mawonekedwe olekanitsa ang'onoang'ono, momwe magawo olimba (kuchokera ku isocyanates ndi ma chain extenders) amamwazikana muzofewa. gawo la gawo (kuchokera ku oligomer polyols) kuti litenge gawo la magawo olumikizirana.Choncho, poyerekeza ndi ma rubber opangidwa (elastomers), polyurethane elastomers ali ndi mphamvu zabwinoko komanso kukana kuvala, kutalika kwapamwamba kumatha kusungidwa pamene kuuma kuli kwakukulu.

Elastic polyurethane zipangizo, zotchedwa "Mlandu" kunja, makamaka zikuphatikizapo chikhalidwe polyurethane elastomer mankhwala, kuyatsa zipangizo monga polyurethane pulasitiki runways, polyurethane zokutira madzi, zomatira, sealants, potting zomatira, etc., mlandu pafupifupi 40% ya ndalama zonse. zopangidwa ndi polyurethane.Zambiri mwazinthu zochiritsidwa zazinthu za CASE (zochokera m'madzi ndi zosungunulira mutachotsa madzi ndi zosungunulira) ndizopanda thovu zotanuka polyurethane.PU synthetic leather resin, zokutira zina ndi zomatira ndizopangidwa ndi zosungunulira kapena zochokera m'madzi, zomwe zitha kuwonedwanso ngati zida za polyurethane elastomer m'njira yotakata.Mwa njira yopapatiza, ma polyurethane elastomers amatanthawuza ma polyurethane elastomers (CPU), thermoplastic polyurethane elastomers (TPU) ndi osakanikirana a polyurethane elastomers (MPU), owerengera 10% kapena kuchepera pang'ono pa kuchuluka konse kwa polyurethane.CPU ndi TPU ndi ma elastomers akuluakulu a polyurethane, ndipo kusiyana kwawo kuli pakupanga ndi ma chain extenders.Mtundu woterewu wa polyurethane elastomer, womwe umadziwikanso kuti "rabara ya polyurethane", ndi wamtundu wapadera wa mphira wopangira.Polyurethane elastomer yogwira ntchito kwambiri ndiyo yabwino kwambiri yosamva kuvala pakati pa zinthu zonse zopangidwa ndi polima, zomwe zimadziwika kuti "king of wear resistance", ndipo zimagwiritsidwa ntchito kwambiri m'madera ambiri, ndipo ntchito zatsopano zikukulabe.

Polyurethane elastomer angagwiritsidwe ntchito m'malo zitsulo, pulasitiki ndi mphira wamba m'madera ena.

Poyerekeza ndi zida zachitsulo, polyurethane elastomer ili ndi ubwino wopepuka kulemera, phokoso lochepa, kukana kuvala, mtengo wotsika wa processing ndi kukana kwa dzimbiri la asidi.Poyerekeza ndi mapulasitiki, ali ndi ubwino wovuta kwambiri komanso kukana kuvala kwambiri.Poyerekeza ndi mphira wamba, polyurethane elastomer ali ndi ubwino avale kukana, kudula kukana, misozi kukana, mkulu kubala mphamvu, ozoni kukana, etc., ndipo n'zosavuta kupanga, akhoza potted, anatsanulira, ndipo ali osiyanasiyana kuuma.