Adhesives yog tsim los tuav cov khoom ua ke, thiab qhov stickiness los los ntawm cov tshuaj bonds thiab cov nqi zog yuav tsum tau rub cov bonds sib nrug … attracted rau qhov tsis zoo dipole ntawm lwm molecule, lub zog tuav cov molecules ua ke yog ib tug van der Waals quab yuam.
Lub zog twg ua rau cov nplaum nplaum?
Thaum cov molecules zoo sib xws, xws li nyob rau hauv cov ntaub ntawv ntawm ob 'kua nplaum molecules,' lub cohesive quab yuam ua rau cov kua nplaum lo rau nws tus kheej. Thaum cov molecules tsis sib xws, xws li nyob rau hauv cov ntaub ntawv ntawm ib tug kua nplaum molecule thiab ib tug molecule ntawm lub substrate (qhov saum npoo ntawm cov kua nplaum yog lo rau), lub nplaum nplaum tuav cov kua nplaum rau lub substrate.
Puas nplaum txhais tau tias nplaum?
Ib daim nplaum yog qee yam nplaum uas tuav cov khoom ua ke. … Lo lus siv tau los piav txog ob yam khoom nws tus kheej: siv cov nplaum, piv txwv li - lossis nws cov khoom ntawm kev nplaum: daim nplaum nplaum nplaum nplaum rau ntawm daim tawv nqaij.
nplaum nplaum yog dab tsi?
Synthetic "glues" lossis adhesives feem ntau yog tsim los ntawm kev sib txuas ntawm polyvinyl acetate (PVA), dej, ethanol, acetone thiab lwm yam khoom. Dej yog siv los hloov cov kua nplaum sib xws; Lwm cov khoom xyaw tswj tus nqi uas cov kua nplaum dries tawm.
ua cov nplaum ua haujlwm li cas?
Nyob rau hauv cov nplaum thiab cov nplaum, tshuab adhesion los ntawm qhov hws ntawm qhov chaw tshwm sim ua tsaug rau cov txheej txheem ziab lossis kho. Thaum cov kua nplaum mus, nws yog nyob rau hauv daim ntawv nyias, kua nplaum, uas tseem tso cai rau qhov chaw txav mus los ywj pheej. Daim ntawv ua kua no tseem tso cai rau cov nplaum nplaum rau hauv qhov pores ntawm qhov chaw.
