Kusowa Madzi m'thupi kwa Polyurethane

Polyurethane (zophimba, zomatira, zomatira)

Chinyezi mu dongosolo la PU chimayanjanitsidwa ndi isocyanate, mosasamala kanthu za zinthu za polyurethane zokhala ndi gawo limodzi kapena ziwiri, zomwe zimapanga amine ndi carbon dioxide, amine imapitiriza kuyanjanitsidwa ndi isocyanate, kotero kuti kugwiritsidwa ntchito kwake kutulutsa mpweya wa carbon dioxide nthawi imodzi, kupanga thovu pamwamba pa filimu ya utoto, zomwe zimapangitsa kuti filimu ya utoto iwonongeke kapena kugwira ntchito bwino.

2% ~ 5% ya sieve ya molecular (ufa) mu dongosolo ndi yokwanira kuchotsa chinyezi chotsala mu dongosolo la PU, koma pamapeto pake zimatengera chinyezi chomwe chili mu dongosolo.

Chophimba choletsa kuwononga

Mu primer yokhala ndi epoxy zinc yambiri, madzi ochepa amatulutsa mphamvu zambiri ndi ufa wa zinc, kupanga haidrojeni, kuwonjezera mphamvu mu mbiya, kufupikitsa moyo wa primer, zomwe zimapangitsa kuti filimu yophimba ikhale yolimba, yolimba komanso yolimba. Sefa ya molecular (ufa) monga desiccant yoyamwa madzi, yomwe ndi yonyowa thupi, imachotsa madzi popanda kuchitapo kanthu ndi substrate. Chifukwa chake sefa ya molecular ndi yotetezeka komanso yabwino kwambiri pamakina ophimba oletsa kuwonongeka.

Chitsulo cha ufa chopangidwa ndi chitsulo

Zofananazo zimatha kuchitika mu zophimba za ufa wachitsulo, monga zophimba za ufa wa aluminiyamu.