Polyurethane adhesive molecular chain e na le sehlopha sa carbamate (-NHCOO-) kapa sehlopha sa isocyanate (-NCO), se arotsoe ka lihlopha tse peli tsa polyisocyanate le polyurethane. , hlahisa lihlopha tsa polyurethane kapa polyurea, e le ho ntlafatsa haholo matla a tsamaiso le ho finyella morero oa ho kopanya.
Likhomaretsi li na le sekhomaretsi, se nang le lintho tse fapaneng tse folisang, polasetiki, li-fillers, solvents, preservatives, stabilizers le coupling agents le li-additives tse ling tse lokiselitsoeng. tsoa ka mor'a e 'ngoe, e leng e ile ea matlafatsa haholo 'maraka oa sekhomaretsi.
1. Boemo ba tsoelo-pele
Sekhomaretsi sa polyurethane ke mofuta oa sekhomaretsi sa maemo a mahareng le se phahameng, se nang le maemo a feto-fetohang, ho hanyetsa tšusumetso, k'hemik'hale, ho hanyetsa ho roala, 'me sa bohlokoa ka ho fetisisa ke ho hanyetsa mocheso o tlaase. Likhomaretsi tsa polyurethane tse loketseng ho tlamahanngoa pakeng tsa lisebelisoa tse fapaneng le tšebeliso e fapaneng.Sekhomaretsi sa polyurethane se qalile ho sebelisoa lebaleng la sesole ka 1947. Ke k'hamphani ea Bayer, triphenyl methane triisocyanate e ile ea sebelisoa ka katleho ho tlamahaneng tšepe le rabara, 'me ea sebelisoa tseleng. ea tanka, e ileng ea rala motheo oa indasteri ea likhomaretsi tsa polyurethane. Japane e ile ea hlahisa theknoloji ea Jeremane le Amerika ka 1954, ea qala ho hlahisa likhomaretsi tsa polyurethane ka 1966, 'me tsa atleha ho hlahisa li-adhesive tsa vinyl polyurethane tse thehiloeng metsing, tse ileng tsa kenngoa tlhahiso ea indasteri ka 1981. hona joale, lipatlisiso le tlhahiso ea li-adhesives tsa polyurethane Japane li sebetsa haholo, 'me hammoho le United States le Europe Bophirimela, Japane e fetohile mohlahisi e moholo le ho romela kantle ho polyurethane. indasteri e mengata e fapaneng le e sebelisoang haholo.
Ka 1956, Chaena e ile ea hlahisa le ho hlahisa triphenyl methane triisocyanate (Lekner adhesive), 'me kapele ea hlahisa toluene diisocyanate (TDI) le sekhomaretsi sa likarolo tse peli tse thehiloeng ho polyurethane, e ntseng e le mofuta o moholo ka ho fetisisa oa sekhomaretsi sa polyurethane Chaena. e hlahisitse mela e mengata e tsoetseng pele ea tlhahiso le lihlahisoa tse tsoang linaheng tse ling, moo ho hlokahalang palo e kholo ea likhomaretsi tsa polyurethane tse tsoang linaheng tse ling ho li tšehetsa, kahoo ho khothalletsa nts'etsopele ea likhomaretsi tsa polyurethane lihlopheng tsa lipatlisiso tsa malapeng. Haholo-holo ka mor'a 1986, indasteri ea polyurethane Chaena e kene nakong. Lilemong tsa morao tjena, theko ea sekhomaretsi sa polyurethane e ea fokotseha, 'me theko ea hona joale ea sekhomaretsi sa polyurethane e phahame ka 20% feela ho feta ea sekhomaretsi sa chloroprene, se fanang ka maemo a hore sekhomaretsi sa polyurethane se kene 'marakeng oa sekhomaretsi sa chloroprene.
Nako ea poso: Mar-03-2021