Product Name:polyurethane

Chigadzirwa molecular chimiro:

Chemical Properties:

Polyurethanes yakatanga kubudiswa uye kuongororwa naDr. Otto Bayer muna 1937. Polyurethane ipolymer umo inodzokorora unit ine urethane moiety. Urethanes zvinobva kune carbamic acids inowanikwa chete muchimiro cheester dzadzo[15]. Chakanakira PU ndechekuti cheni haina kuumbwa chete neatomu kabhoni asi kuti heteroatoms, okisijeni, kabhoni uye nitrogen[4]. Kune maindasitiri ekushandisa, polyhydroxyl musanganiswa unogona kushandiswa. Saizvozvo, poly-functional nitrogen makomisheni anogona kushandiswa pane amide linkages. Nekuchinja uye kusiyanisa iyo polyhydroxyl uye polyfunctional nitrogen makomisheni, akasiyana maPU anogona kugadzirwa [15]. Polyester kana polyether resins ine hydroxyl mapoka anoshandiswa kugadzira polyesteror polyether-PU, zvichiteerana [6]. Kusiyana kwenhamba yekutsiviwa uye kupatsanurana pakati nepakati pemaketani emapazi zvinoburitsa maPU kubva pamutsara kuenda kune branched uye 9exible kune yakaoma. Linear PUs inoshandiswa kugadzira mafiibha nekuumba[6]. Flexible PUs inoshandiswa mukugadzirwa kweanosunga maajenti uye machira[5]. Mapurasitiki anochinjika uye akaomarara ane furo, ayo anoumba mazhinji ePU anogadzirwa, anogona kuwanikwa nenzira dzakasiyana muindasitiri[7]. Uchishandisa yakaderera molecular mass prepolymers, akasiyana block copolymers anogona kugadzirwa. Iyo terminal hydroxyl boka inobvumira kuchinjika zvidhinha, zvinonzi zvikamu, kuti iiswe mu PU cheni. Kusiyana muzvikamu izvi kunoguma nekusiyana-siyana kwesimba rekusimba uye elasticity. Mabhuroki anopa akaomesesa crystalline chikamu uye ane cheni extender anonzi sezvikamu zvakaoma[7]. Avo vanoburitsa amorphous rubbery phase uye ine polyester/polyether vanonzi zvikamu zvinyoro. Mukutengesa, aya block polymers anozivikanwa seSegmented Pus

Application:

Flexible polyurethane inonyanya mutsara chimiro ne thermoplasticity, iyo ine kugadzikana kuri nani, makemikari kuramba, kusimba uye michina zvivakwa kupfuura PVC furo, ine kushoma kudzvanya kusiyanisa. Iyo ine yakanaka yekupisa yekupisa, kuvharidzira inzwi, kumisa kuvhunduka uye anti-chepfu zvinhu. Naizvozvo, inoshandiswa sekurongedza, kuvharidzira ruzha uye kusefa zvinhu. Rigid polyurethane plastiki yakareruka, inovhara mutsindo, yakanyanya kupisa kupisa, makemikari kuramba, yakanaka magetsi zvivakwa, nyore kugadzirisa, uye kunyura kwemvura. Inonyanya kushandiswa sezvinhu zvekugadzira zvekuvaka, mota, indasitiri yendege, kupisa kupisa uye kupisa kwemafuta. Polyurethane elastomer performance pakati pepurasitiki nerabha, mafuta kuramba, kupfeka kuramba, kudzikira tembiricha kuramba, kuchembera kuramba, kuoma kwakanyanya, elasticity. Inonyanya kushandiswa muindasitiri yeshangu uye indasitiri yezvokurapa. Polyurethane inogona zvakare kugadzirwa kuita zvekunamira, machira, synthetic dehwe, nezvimwe.