Polyurethane elastomers zezepolymers block, oko kukuthi, polyurethane macromolecules iqulunqwe "amacandelo ethambileyo" kunye "namacandelo anzima" kwaye zenze isakhelo micro isigaba sokwahlula.Amacandelo anzima (aphuma kwi-isocyanates kunye ne-chain extenders) ahlakazwe kwingingqi yesigaba esithambileyo (ephuma kwi-oligomer polyols) kwaye adlale indima yamanqaku okudibanisa ngokomzimba.Ke ngoko, xa kuthelekiswa nezinye irabha yokwenziwa (elastomers), ii-polyurethane elastomers zinamandla angcono kunye nokumelana nokunxiba, ubude obuphezulu busenokugcinwa xa ubulukhuni buphezulu.
Imathiriyeli ye-elastic polyurethane, ekubhekiselwa kuyo njenge "case" kumazwe angaphandle, ikakhulu ibandakanya iimveliso ze-polyurethane elastomer, umgaqo weenqwelo-moya weplastiki ye-polyurethane kunye nezinye izinto zokuhamba ngeenyawo, i-polyurethane yokugquma kwamanzi, izinto zokuncamathelisa, izitywini, izinto zokuncamathelisa, njl. isixa esipheleleyo seemveliso zepolyurethane.Uninzi lweemveliso ezinyangisiweyo zemathiriyeli yecala (imveliso esekwe emanzini kunye ne-solvent-based isusa amanzi kunye nezinyibilikisi) zizinto ezingenagwebu elastiki yepolyurethane.I-PU yesikhumba ye-resin eyenziweyo, ezinye iingubo kunye ne-adhesives zisekelwe kwi-solvent-based okanye imveliso yamanzi, enokuthi ithathwe njengezinto ze-polyurethane elastomer kwingqiqo ebanzi.Ngengqiqo emxinwa, i-polyurethane elastomer ibhekisa kwi-polyurethane elastomer (CPU), i-thermoplastic polyurethane elastomer (TPU) kunye ne-polyurethane elastomer edibeneyo (MPU), i-accounting ye-10% okanye ngaphantsi kwe-polyurethane iyonke.I-CPU kunye ne-TPU zezona zinto ziphambili ze-polyurethane elastomers, kwaye iyantlukwano ikwimiba efana nenkqubo yemveliso kunye ne-chain extender.Olu hlobo lwe-elastomer ye-polyurethane yesiko, ekwabizwa ngokuba yi-"polyurethane rubber", yeyohlobo lwerabha yokwenziwa ekhethekileyo.Ukusebenza okuphezulu kwe-polyurethane elastomer yimathiriyeli enokumelana nokunxiba okugqwesileyo phakathi kwazo zonke izinto zokwenziwa zepolymer.Yaziwa ngokuba yi "king of wear resistance".Isetyenziswa kakhulu kwiinkalo ezininzi, kwaye izicelo ezintsha zisakhula.
I-polyurethane elastomers ingasetyenziselwa ukutshintsha isinyithi, iiplastiki kunye nerabha eqhelekileyo kwezinye iindawo.
Xa kuthelekiswa nezinto zetsimbi, i-polyurethane elastomer ineenzuzo zobunzima bokukhanya, ingxolo ephantsi, ukuxhathisa ilahleko, iindleko eziphantsi zokusetyenzwa kunye nokumelana nomhlwa kwe-asidi.Xa kuthelekiswa neeplastiki, ineenzuzo zokuqina okuphezulu kunye nokumelana nokunxiba okuphezulu.Xa kuthelekiswa nerabha eqhelekileyo, i-polyurethane elastomer ineengenelo zokuxhathisa ukunxiba, ukuxhathisa ukusika, ukuxhathisa ukukrazula, ukuthwala okuphezulu, ukumelana ne-ozone, ukwenziwa okulula, ukugalela kunye nokugalela, kunye noluhlu lobulukhuni olubanzi.
I-polyurethane elastomer luhlobo olubalulekileyo lwe-polyurethane.Okwangoku, ukusetyenziswa kwayo kubalelwa malunga ne-10% yokusetyenziswa iyonke ye-polyurethane.I-polyurethane elastomer isetyenziselwa ukwenza zonke iintlobo zamavili erabha, amabhanti okuhambisa, imibhobho yerabha enganyangekiyo kunye noxinzelelo, imicu yokutywina kunye nemisesane, iishethi zentambo kunye neefilimu ezahlukeneyo.Iimveliso zisetyenziswa ngokubanzi kwintsimbi kunye nentsimbi, ukwenza iphepha, imigodi, oomatshini, ukushicilela kunye namanye amashishini.I-polyurethane elastomer inokuguqulwa ngezinye iipolymers, iifayibha, iifayili zomgubo, njl.njl ukunciphisa iindleko kunye nokuphucula ukusebenza.
Ixesha lokuposa: May-05-2022