I-Polyurethane adhesive molecular chain iqulethe iqela le-carbamate (-NHCOO-) okanye iqela le-isocyanate (-NCO), lihlulwe libe yi-polyisocyanate kunye ne-polyurethane iindidi ezimbini. , ukuvelisa amaqela e-polyurethane okanye i-polyurea, ukwenzela ukuba kuphuculwe kakhulu amandla enkqubo kunye nokufezekisa injongo yokudibanisa.
Izinto zokuncamathelisa ubukhulu becala zincamathelisa, zineearhente ezahlukeneyo zokunyanga, iplasticizer, fillers, solvents, preservatives, stabilizers kunye ne-coupling agents kunye nezinye izongezo ezilungisiweyo. Kule minyaka yakutshanje, ngokuphuculwa okukhawulezayo komgangatho wophuhliso lwemathiriyeli, kwafika iintlobo ngeentlobo zokuncamathelisa ezinokusebenza ngamandla. ngaphandle enye emva kwenye, nto leyo eyatyebisa kakhulu imarike yokuncamathelisa.
1. Ubume bophuhliso
Ukuncamatheliswa kwePolyurethane luhlobo lokuncamathelisa oluphakathi noluphezulu, olunokuguquguquka okugqwesileyo, ukuxhathisa impembelelo, ukuxhathisa imichiza, ukuxhathisa ukunxiba, kwaye okona kubalulekileyo kukumelana nobushushu obuphantsi.Ngokuhlengahlengisa imathiriyeli ekrwada kunye nefomula, sinokuyila iindidi ngeendidi. Izinto zokuncamathelisa i-polyurethane ezilungele ukudityaniswa phakathi kwezinto ezahlukeneyo kunye nosetyenziso olwahlukileyo.I-adhesive ye-polyurethane yaqala ukusetyenziswa kwindawo yomkhosi ngo-1947. Yinkampani ye-Bayer, i-triphenyl methane triisocyanate yasetyenziswa ngempumelelo ekudibaneni kwesinyithi kunye nerabha, kwaye isetyenziswe kwindlela. yetanki, eyathi yabeka isiseko soshishino lokuncamathelisa i-polyurethane. IJapan yazisa iteknoloji yaseJamani neyaseMelika ngo-1954, yaqala ukuvelisa izinto zokuncamathelisa i-polyurethane ngo-1966, yaza yaphuhliswa ngempumelelo i-adhesives ye-vinyl polyurethane yamanzi, eyafakwa kwimveliso yoshishino ngo-1981. ngoku, uphando kunye nokuveliswa kokuncamatheliswa kwe-polyurethane eJapan kusebenza kakhulu, kwaye kunye ne-United States kunye neNtshona Yurophu, iJapan iye yaba ngumvelisi omkhulu kunye nomthengisi we-polyurethane.Ukusukela ngo-1980, i-polyurethane adhesives iphuhliswe ngokukhawuleza, kwaye ngoku iye yaba ngumvelisi omkhulu kunye nomthengisi we-polyurethane. uluhlu olubanzi nolusetyenziswa ngokubanzi.
Ngo-1956, i-China yavelisa kwaye yavelisa i-triphenyl methane triisocyanate (i-Lekner adhesive), kwaye ngokukhawuleza yavelisa i-toluene diisocyanate (TDI) kunye ne-adhesive ye-solvent-based polyurethane adhesive, eselona didi lukhulu lwe-polyurethane adhesive e-China. yazisa imigca emininzi yemveliso ephucukileyo kunye neemveliso ezivela phesheya, apho inani elikhulu lezinto zokuncamathelisa ezithengwa kwamanye amazwe ziyafuneka ukuze zixhase, ngaloo ndlela kukhuthazwa uphuhliso lokuncamatheliswa kwepolyurethane kwiiyunithi zophando lwasekhaya.Ingakumbi emva ko-1986, ishishini le-polyurethane eTshayina lingene kwixesha. Kwiminyaka yakutshanje, ixabiso leglue ye-polyurethane liyancipha, kwaye ixabiso langoku leglue ye-polyurethane lingaphezulu kwe-20% kuphela ngaphezu kweglue ye-chloroprene, ebonelela ngeemeko zeglue polyurethane ukuba ithathe i-chloroprene glue market.
Ixesha lokuposa: Mar-03-2021