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Polyurethane adhesives - xidigta mustaqbalka ee koollada

Silsiladda unugyada 'Polyurethane adhesive molecular chain' waxay ka kooban tahay kooxda carbamate (-NHCOO-) ama isocyanate group (-NCO), oo loo qaybiyay polyisocyanate iyo polyurethane laba qaybood. Adhesives Poliurethane, iyadoo loo marayo falcelinta kooxaha isocyanate ee nidaamka iyo walxaha ay ku jiraan haydrojiin firfircoon gudaha ama banaanka nidaamka , soo saar kooxaha polyurethane ama polyurea, si markaa si weyn loo hagaajiyo xoogga nidaamka loona gaaro ujeedka isku xirnaanta.

Koollayaashu badanaa waa kuwa isku dhejisan, oo leh wakiil daaweyn kala duwan, baco-gashiye, buuxiyeyaal, dareerayaal, ilaaliyayaal, xasiliyayaal iyo wakiilo isku xidha iyo waxyaabo kale oo lagu daro Sannadihii ugu dambeeyay, iyada oo si dhakhso leh kor loogu qaadayo heerka waxsoosaarka, noocyo kala duwan oo xabag leh oo si xoog leh loogu adeegsan karo ayaa yimid. midba midka kale u sii baxa, taas oo si weyn u kobcisay suuqa xabagta.

1. Xaaladda horumarka

Koollo Polyurethane waa nooc ka mid ah dhejiska fasalka dhexe iyo sare, kaas oo leh dabacsanaan aad u fiican, caabbinta saamaynta, iska caabbinta kiimikada, iska caabbinta, tan ugu muhiimsanina waa heerkulkeeda iska caabbinta. xabagta polyurethane kuwaas oo ku habboon isku xidhka ka dhexeeya alaabooyin kala duwan iyo adeegsiyo kala duwan. Koollada loo yaqaan 'Polyurethane xabagta' waxaa markii ugu horreysay loo adeegsaday aagga milatariga sanadkii 1947. Shirkadda Bayer, triphenyl methane triisocyanate waxaa si guul leh loogu dabaqay isku xidhka birta iyo caagga, waxaana loo adeegsaday wadada Japan ayaa soo bandhigtay tiknoolajiyad Jarmal iyo Mareykan ah sanadkii 1954, waxay bilaabeen inay soo saaraan xabagta polyurethane sanadkii 1966, waxayna si guul leh u soo saartay xabagta vinyl-ka loo yaqaan polyurethane ee loo yaqaan "vinyl polyurethane", oo la galiyay wax soosaarka warshadaha sanadkii 1981. la joogo, cilmi-baarista iyo soo-saarka koolladaha polyurethane ee Japan waa kuwo aad u firfircoon, oo ay la socdaan U Waddammada iyo Galbeedka Yurub, Japan waxay noqotay soo saaraha iyo dhoofinta weyn ee polyurethane. Laga soo bilaabo 1980-yadii, xabagta polyurethane si dhakhso leh ayey u horumartay, haddana waxay noqdeen noocyo kala duwan oo si ballaaran loo isticmaalo.

Sannadkii 1956, Shiinaha ayaa soo saartay oo soo saartay triphenyl methane triisocyanate (adkaynta Lekner), waxayna si dhakhso ah u soo saartay toluene diisocyanate (TDI) iyo koollo polyurethane ah oo laba qaybood ku xalliya, taas oo wali ah noocyada ugu badan ee koollada polyurethane ee Shiinaha. soo saaray khadad wax soo saar oo horumarsan iyo badeecado dibedda ka yimid, taas oo loo baahan yahay tiro badan oo koollo polyurethane ah oo la soo dhoofiyo si loo taageero, sidaas awgeedna loo dhiirrigeliyo horumarinta koollada polyurethane ee unugyada cilmi-baarista gudaha. Gaar ahaan wixii ka dambeeyay 1986, warshadaha polyurethane ee Shiinaha ayaa galay muddo Sannadihii ugu dambeeyay, qiimaha xabagta polyurethane way sii yaraaneysaa, qiimaha hadda ee xabagta polyurethane wuxuu kaliya 20% ka sarreeyaa kan xabagta chloroprene, taasoo siineysa shuruudaha xabagta polyurethane si ay u qabsato suuqa xabagta chloroprene.


Waqtiga boostada: Mar-03-2021