Iinkalo zesicelo kunye nethemba lophuhliso lwe-elastic polyurethane materials

I-Polyurethane elastomers zeye-block polymers, oko kukuthi, i-polyurethane macromolecules yenziwe "ngamacandelo athambileyo" kunye "namacandelo anzima" kwaye yenze i-micro-phase yokwahlula isakhiwo, apho amacandelo anzima (ukusuka kwi-isocyanates kunye ne-chain extenders) ahlakazwe kwindawo ethambileyo. ummandla wesigaba secandelo (ukusuka kwi-oligomer polyols) ukuze udlale indima yamanqaku okudibanisa umzimba.Ke ngoko, xa kuthelekiswa nezinye iirubha zokwenziwa (elastomers), ii-polyurethane elastomers zinamandla angcono kwaye ziyakwazi ukumelana nokunxiba, ubude obuphezulu busenokugcinwa xa ubulukhuni buphezulu.

Imathiriyeli ye-elastic polyurethane, ekubhekiselwa kuyo njenge "CASE" phesheya, ikakhulu ibandakanya iimveliso ze-polyurethane elastomer, izinto zokugaqa ezifana neendlela zeplastiki ze-polyurethane, i-polyurethane yokugquma kwamanzi, i-adhesives, i-sealants, i-adhesives ye-potting, njl., ibalwa malunga ne-40% yemali iyonke. iimveliso ze-polyurethane.Uninzi lweemveliso eziphilisiweyo ze-CASE (imveliso esekwe emanzini kunye ne-solvent emva kokususa amanzi kunye ne-solvents) ayizinto ezingezo ze-foam elastic polyurethane.I-PU yesikhumba ye-resin yesikhumba, ezinye iingubo kunye ne-adhesives zisekelwe kwi-solvent okanye imveliso esekwe emanzini, enokuthi ithathelwe ingqalelo njengezinto ze-polyurethane elastomer kwingqiqo ebanzi.Ngengqiqo emxinwa, i-polyurethane elastomers ibhekisa kwi-polyurethane elastomers (CPU), i-thermoplastic polyurethane elastomers (TPU) kunye ne-polyurethane elastomers (MPU) edibeneyo (i-MPU), i-accounting ye-10% okanye ngaphantsi kancinci kwi-total ye-polyurethane.I-CPU kunye ne-TPU zezona ziphambili ze-polyurethane elastomers, kwaye iyantlukwano yabo ilele kwinkqubo yokuvelisa kunye nezandiso zamakhonkco.Olu hlobo lwe-polyurethane elastomer yendabuko, eyaziwa nangokuthi "irabha ye-polyurethane", yeyohlobo olukhethekileyo lwerabha yokwenziwa.I-polyurethane elastomer esebenza ngokuphezulu yeyona nto ibalaseleyo engaxhathisiyo phakathi kwazo zonke izinto ezenziweyo zepolymer, ezaziwa ngokuba “yinkosi yokumelana nokunxiba”, kwaye isetyenziswa kakhulu kwiinkalo ezininzi, kwaye izicelo ezintsha zisakhula.

I-polyurethane elastomer ingasetyenziselwa ukutshintsha isinyithi, iplastiki kunye nerabha eqhelekileyo kwezinye iindawo.

Xa kuthelekiswa nezixhobo zetsimbi, i-polyurethane elastomer ineenzuzo zobunzima obulula, ingxolo ephantsi, ukuxhathisa ukunxiba, 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, umthamo ophezulu wokuthwala, ukuxhathisa i-ozone, njl., kwaye kulula ukuyivelisa, inokugalelwa, igalelwe, kwaye inoluhlu olubanzi lobulukhuni.