P\u011bna zp\u016fsobuje v pr\u016fmyslov\u00fdch procesech velk\u00e9 probl\u00e9my. Zp\u016fsobuje vady povrchov\u00fdch n\u00e1t\u011br\u016f a znehodnocuje pln\u011bn\u00ed n\u00e1dob. V\u00fdrobci pot\u0159ebuj\u00ed odp\u011b\u0148ov\u00e1n\u00ed - kl\u00ed\u010dov\u00fd proces, kter\u00fd sni\u017euje tvorbu p\u011bny v pr\u016fmyslov\u00fdch kapalin\u00e1ch a zabra\u0148uje j\u00ed, aby byla zachov\u00e1na kvalita v\u00fdrobk\u016f a optimalizov\u00e1n provoz.<\/p>\n
Chemick\u00e9 p\u0159\u00edsady zn\u00e1m\u00e9 jako odp\u011b\u0148ova\u010de pom\u00e1haj\u00ed omezit ne\u017e\u00e1douc\u00ed p\u011bn\u011bn\u00ed. Tato \u010dinidla vyu\u017e\u00edvaj\u00ed t\u0159i mechanismy: odvlh\u010den\u00ed, rozta\u017een\u00ed\/p\u0159emost\u011bn\u00ed a destabilizaci. Mezi obl\u00edben\u00e9 odp\u011b\u0148ova\u010de pat\u0159\u00ed nerozpustn\u00e9 oleje, polydimethylsiloxany, n\u011bkter\u00e9 alkoholy, stearany a glykoly. Ka\u017ed\u00fd odp\u011b\u0148ova\u010d vy\u017eaduje pe\u010dliv\u00e9 slo\u017een\u00ed, aby odpov\u00eddal syst\u00e9mu, kter\u00fd o\u0161et\u0159uje.<\/p>\n
Tento \u010dl\u00e1nek v\u00e1m pom\u016f\u017ee pochopit v\u011bdeck\u00e9 poznatky o tvorb\u011b p\u011bny a o tom, jak funguj\u00ed r\u016fzn\u00e9 odp\u011b\u0148ovac\u00ed prost\u0159edky. Z\u00edsk\u00e1te praktick\u00e9 pokyny pro v\u00fdb\u011br spr\u00e1vn\u00e9ho \u0159e\u0161en\u00ed pro va\u0161e pr\u016fmyslov\u00e9 v\u00fdzvy. Obsah v\u00e1m poskytne z\u00e1kladn\u00ed znalosti o \u00fa\u010dinn\u00e9m odp\u011b\u0148ov\u00e1n\u00ed, a\u0165 u\u017e se pot\u00fdk\u00e1te s neust\u00e1l\u00fdmi probl\u00e9my s p\u011bnou, nebo se chcete sezn\u00e1mit se z\u00e1kladn\u00ed teori\u00ed.<\/p>\n
Pr\u016fmyslov\u00e9 odp\u011b\u0148ov\u00e1n\u00ed vy\u017eaduje pochopen\u00ed toho, jak se p\u011bny tvo\u0159\u00ed a p\u0159etrv\u00e1vaj\u00ed. P\u011bnov\u00fd syst\u00e9m rozptyluje bubliny plynu v kapaln\u00e9 f\u00e1zi a z\u016fst\u00e1v\u00e1 termodynamicky nestabiln\u00ed. Tyto p\u011bny vykazuj\u00ed v pr\u016fmyslov\u00fdch aplikac\u00edch pozoruhodnou st\u00e1lost.<\/p>\n
Povrchov\u011b aktivn\u00ed l\u00e1tky (povrchov\u011b aktivn\u00ed l\u00e1tky) maj\u00ed z\u00e1sadn\u00ed v\u00fdznam pro tvorbu a stabilitu p\u011bny. Tyto amfifiln\u00ed molekuly obsahuj\u00ed jak hydrofiln\u00ed, tak hydrofobn\u00ed \u010d\u00e1sti, kter\u00e9 jim umo\u017e\u0148uj\u00ed adsorpci na rozhran\u00ed plyn-kapalina. Povrchov\u011b aktivn\u00ed l\u00e1tky difunduj\u00ed do roztok\u016f a dosahuj\u00ed rozhran\u00ed mezi vytvo\u0159en\u00fdmi j\u00e1dry a kapalinou. Vytv\u00e1\u0159ej\u00ed bubliny t\u00edm, \u017ee sni\u017euj\u00ed mezif\u00e1zov\u00e9 nap\u011bt\u00ed a zabra\u0148uj\u00ed koalescenci bublin p\u0159ed jejich stabilizac\u00ed.<\/p>\n
Povrchov\u011b aktivn\u00ed l\u00e1tky dosahuj\u00ed maxim\u00e1ln\u00ed p\u011bnivosti p\u0159i st\u0159edn\u00edch koncentrac\u00edch. Povrchov\u011b aktivn\u00ed l\u00e1tka m\u016f\u017ee zm\u011bnit rovnom\u011brn\u00e9 bubl\u00e1n\u00ed na bun\u011b\u010dnou p\u011bnu a velikost bublin z\u00e1vis\u00ed na Reynoldsov\u011b \u010d\u00edsle otvoru. Povrch se st\u00e1v\u00e1 elastick\u00e9<\/strong>, kter\u00fd pom\u00e1h\u00e1 bublink\u00e1m odol\u00e1vat deformaci a mechanick\u00e9mu nam\u00e1h\u00e1n\u00ed.<\/p>\n P\u011bnu tvo\u0159\u00ed n\u011bkolik strukturn\u00edch prvk\u016f. Lamellae<\/strong> jsou tenk\u00e9 vrstvy kapaliny, kter\u00e9 odd\u011bluj\u00ed bubliny plynu. T\u0159i lamely se setk\u00e1vaj\u00ed a vytv\u00e1\u0159ej\u00ed kan\u00e1lky, kter\u00e9 se naz\u00fdvaj\u00ed Hranice n\u00e1horn\u00ed plo\u0161iny<\/strong>, kter\u00e9 se spojuj\u00ed ve vrcholech pod \u00fahlem 109,5\u00b0. P\u011bna se m\u011bn\u00ed z \u201cmokr\u00e9\u201d na \u201csuchou\u201d, jak se kapalina pohybuje od st\u011bn bublin k t\u011bmto hranic\u00edm plo\u0161ek. T\u00edm se bubliny pod\u00e9l hranic st\u00e1vaj\u00ed v\u00edce polyedrick\u00fdmi.<\/p>\n Struktura bun\u011bk p\u011bny - velikost, tlou\u0161\u0165ka st\u011bny a hustota - ovliv\u0148uje jej\u00ed zd\u00e1nlivou hustotu a stabilitu. Kapaln\u00fd pod\u00edl p\u011bny ur\u010duje mnoho fyzik\u00e1ln\u00edch vlastnost\u00ed.<\/p>\n Na str\u00e1nk\u00e1ch Gibbs-Marangoniho efekt<\/strong> slou\u017e\u00ed jako kl\u00ed\u010dov\u00fd stabiliza\u010dn\u00ed mechanismus. Gradienty povrchov\u00e9ho nap\u011bt\u00ed vznikaj\u00ed, kdy\u017e se lamela rozt\u00e1hne nebo naru\u0161\u00ed, co\u017e sni\u017euje koncentraci povrchov\u011b aktivn\u00ed l\u00e1tky v dan\u00e9m m\u00edst\u011b. Tyto gradienty vytv\u00e1\u0159ej\u00ed tangenci\u00e1ln\u00ed proud\u011bn\u00ed, kter\u00e9 p\u0159erozd\u011bluje povrchov\u011b aktivn\u00ed l\u00e1tku pod\u00e9l filmu.<\/p>\n Tento samol\u00e9\u010debn\u00fd proces funguje specifick\u00fdm zp\u016fsobem. P\u016fsob\u00edc\u00ed s\u00edla vytv\u00e1\u0159\u00ed na povrchu bublin tenk\u00e1 m\u00edsta, \u010d\u00edm\u017e se zv\u011bt\u0161uje povrchov\u00e1 plocha a z\u00e1rove\u0148 se sni\u017euje koncentrace povrchov\u011b aktivn\u00ed l\u00e1tky. Gradienty nap\u011bt\u00ed p\u0159itahuj\u00ed povrchov\u011b aktivn\u00ed l\u00e1tky ke zten\u010den\u00fdm m\u00edst\u016fm a p\u0159iv\u00e1d\u011bj\u00ed podkladov\u00e9 vrstvy kapaliny k obnov\u011b filmu. \u010cist\u00e9 kapaliny nep\u011bn\u00ed, proto\u017ee tento proces pot\u0159ebuje povrchov\u011b aktivn\u00ed l\u00e1tky.<\/p>\n Gibbs-Marangoniho parametr m\u011b\u0159\u00ed pom\u011br mezi rychlost\u00ed tangenci\u00e1ln\u00edho a norm\u00e1ln\u00edho pohybu. Vy\u0161\u0161\u00ed hodnoty vedou k v\u011bt\u0161\u00ed variabilit\u011b povrchov\u00e9ho nap\u011bt\u00ed, co\u017e zvy\u0161uje redistribuci povrchov\u011b aktivn\u00ed l\u00e1tky a sni\u017euje pravd\u011bpodobnost rozpadu p\u011bny.<\/p>\n Odp\u011b\u0148ova\u010de p\u016fsob\u00ed pomoc\u00ed slo\u017eit\u00fdch fyzik\u00e1ln\u00edch a chemick\u00fdch mechanism\u016f proti stabilit\u011b p\u011bny. Formul\u00e1to\u0159i mus\u00ed t\u011bmto proces\u016fm rozum\u011bt, aby mohli vybrat spr\u00e1vn\u00e9 prost\u0159edky, kter\u00e9 funguj\u00ed v r\u016fzn\u00fdch aplikac\u00edch.<\/p>\n Mechanismus odvlh\u010dov\u00e1n\u00ed je kl\u00ed\u010dov\u00fdm principem v nauce o odp\u011b\u0148ov\u00e1n\u00ed. Tento mechanismus vy\u017eaduje, aby kontaktn\u00ed \u00fahel mezi odp\u011b\u0148ova\u010dem a p\u011bn\u00edc\u00ed kapalinou byl v\u011bt\u0161\u00ed ne\u017e 90\u00b0 p\u0159i m\u011b\u0159en\u00ed p\u0159es vodnou f\u00e1zi. P\u0159i tomto kritick\u00e9m \u00fahlu nem\u016f\u017ee nap\u011b\u0148ovac\u00ed kapalina sm\u00e1\u010det povrch odp\u011b\u0148ova\u010de. To vytv\u00e1\u0159\u00ed ide\u00e1ln\u00ed podm\u00ednky pro zni\u010den\u00ed p\u011bny. Hydrofobn\u00ed \u010d\u00e1stice s ostr\u00fdmi hranami tento proces usnad\u0148uj\u00ed. Proraz\u00ed p\u011bnov\u00fd film a vytvo\u0159\u00ed p\u0159es n\u011bj \u201cmost\u201d. Kapalina se pak st\u00e1hne z povrchu \u010d\u00e1stice a p\u0159eru\u0161\u00ed film na linii t\u0159\u00edf\u00e1zov\u00e9ho kontaktu.<\/p>\n Kapky odp\u011b\u0148ova\u010de nejprve proraz\u00ed a p\u0159emost\u00ed lamelu p\u011bny v mechanismu p\u0159emost\u011bn\u00ed a rozta\u017een\u00ed. Tyto m\u016fstky se st\u00e1vaj\u00ed slab\u00fdmi m\u00edsty ve struktu\u0159e p\u011bny. P\u0159emost\u011bn\u00e1 kapka odp\u011b\u0148ova\u010de se st\u00e1v\u00e1 nejzraniteln\u011bj\u0161\u00ed \u010d\u00e1st\u00ed lamely. I nepatrn\u00e9 natahovac\u00ed s\u00edly p\u016fsob\u00edc\u00ed na kapi\u010dku odp\u011b\u0148ova\u010de mohou zp\u016fsobit jej\u00ed zlomen\u00ed. Nav\u00edc odp\u011b\u0148ova\u010de blokuj\u00ed Marangoniho efekt - samoopravn\u00fd mechanismus, kter\u00fd udr\u017euje stabilitu p\u011bny. Odp\u011b\u0148ova\u010d, kter\u00fd se \u0161\u00ed\u0159\u00ed po povrchu lamely, vytv\u00e1\u0159\u00ed gradient povrchov\u00e9ho nap\u011bt\u00ed. Tento gradient bojuje proti p\u0159irozen\u00e9mu Marangoniho toku p\u011bny. Opa\u010dn\u00e9 proud\u011bn\u00ed zten\u010duje lamelu v bl\u00edzkosti kapky odp\u011b\u0148ova\u010de a v\u00edce oslabuje strukturu p\u011bny.<\/p>\n N\u011bkter\u00e9 odp\u011b\u0148ova\u010de m\u011bn\u00ed zp\u016fsob, jak\u00fdm se povrchov\u011b aktivn\u00ed l\u00e1tky \u0161\u00ed\u0159\u00ed v p\u011bnov\u00e9m syst\u00e9mu. Molekuly odp\u011b\u0148ova\u010de p\u0159eb\u00edraj\u00ed rozhran\u00ed plyn-kapalina prost\u0159ednictv\u00edm kompetitivn\u00ed adsorpce. T\u00edm vytla\u010duj\u00ed p\u011bn\u00edc\u00ed povrchov\u011b aktivn\u00ed l\u00e1tky. N\u011bkter\u00e9 odp\u011b\u0148ova\u010de nav\u00edc mohou rozpou\u0161t\u011bt zp\u011b\u0148uj\u00edc\u00ed povrchov\u011b aktivn\u00ed l\u00e1tky. T\u00edm se sni\u017euje jeho koncentrace a st\u011bny bublin jsou slab\u0161\u00ed. Tento proces sni\u017euje povrchovou pru\u017enost p\u011bnov\u00fdch film\u016f - co\u017e je z\u00e1sadn\u00ed vlastnost pro stabilitu p\u011bny. P\u011bnov\u00e9 filmy bez dostate\u010dn\u00e9 pru\u017enosti se p\u0159i mechanick\u00e9m nam\u00e1h\u00e1n\u00ed snadno rozpadaj\u00ed.<\/p>\n O \u00fa\u010dinnosti kapaln\u00fdch odp\u011b\u0148ova\u010d\u016f rozhoduj\u00ed dva kl\u00ed\u010dov\u00e9 faktory: koeficient penetrace (E) a koeficient rozt\u00edr\u00e1n\u00ed (S). Koeficient penetrace ukazuje, zda m\u016f\u017ee kapka odp\u011b\u0148ova\u010de proniknout do lamely p\u011bny. Aby fungoval, mus\u00ed b\u00fdt E > 0. Koeficient rozt\u00edratelnosti \u0159\u00edd\u00ed, jak dob\u0159e se odp\u011b\u0148ova\u010d \u0161\u00ed\u0159\u00ed po povrchu p\u011bny, jakmile se dostane dovnit\u0159. Aby spr\u00e1vn\u011b fungoval, mus\u00ed b\u00fdt S > 0. Oba koeficienty vych\u00e1zej\u00ed z mezif\u00e1zov\u00e9ho nap\u011bt\u00ed mezi t\u0159emi f\u00e1zemi: kapalinou, kter\u00e1 se m\u00e1 nap\u011bnit, odp\u011b\u0148ova\u010dem a vzduchem. Pe\u010dliv\u00e9 slo\u017een\u00ed pom\u00e1h\u00e1 odp\u011b\u0148ova\u010d\u016fm dos\u00e1hnout nejlep\u0161\u00edch hodnot t\u011bchto koeficient\u016f. T\u00edm je zaji\u0161t\u011bno jejich dobr\u00e9 fungov\u00e1n\u00ed v pozemn\u00edch aplikac\u00edch.<\/p>\n Pr\u016fmyslov\u00e9 odp\u011b\u0148ova\u010de jsou k dispozici v r\u016fzn\u00fdch slo\u017een\u00edch, kter\u00e1 se zam\u011b\u0159uj\u00ed na specifick\u00e9 probl\u00e9my s p\u011bn\u011bn\u00edm v pr\u016fmyslov\u00fdch odv\u011btv\u00edch v\u0161ech velikost\u00ed. Spr\u00e1vnou volbu odp\u011b\u0148ova\u010de ur\u010duje n\u011bkolik faktor\u016f, nap\u0159\u00edklad typ p\u011bny, podm\u00ednky zpracov\u00e1n\u00ed a po\u017eadavky na kone\u010dn\u00fd produkt.<\/p>\n Silikonov\u00e9 odp\u011b\u0148ova\u010de jsou polymery s k\u0159em\u00edkovou p\u00e1te\u0159\u00ed, kter\u00e9 v\u00fdrobci vytv\u00e1\u0159ej\u00ed jako nosi\u010de oleje nebo emulze na b\u00e1zi vody. Tyto \u00fa\u010dinn\u00e9 prost\u0159edky obsahuj\u00ed hydrofobn\u00ed oxid k\u0159emi\u010dit\u00fd v silikonov\u00e9m oleji v kombinaci s emulg\u00e1tory, kter\u00e9 se rychle \u0161\u00ed\u0159\u00ed v p\u011bniv\u00fdch m\u00e9di\u00edch. Skv\u011ble funguj\u00ed p\u0159i odstra\u0148ov\u00e1n\u00ed povrchov\u00e9 p\u011bny a uvol\u0148ov\u00e1n\u00ed zachycen\u00e9ho vzduchu, d\u00edky \u010demu\u017e jsou ide\u00e1ln\u00ed pro nevodn\u00e9 syst\u00e9my, jako je zpracov\u00e1n\u00ed ropy. Potravin\u00e1\u0159sk\u00e9 z\u00e1vody pou\u017e\u00edvaj\u00ed tyto odp\u011b\u0148ova\u010de, proto\u017ee z\u016fst\u00e1vaj\u00ed stabiln\u00ed za r\u016fzn\u00fdch podm\u00ednek a dod\u00e1vaj\u00ed se ve specializovan\u00fdch potravin\u00e1\u0159sk\u00fdch formulac\u00edch. Jejich n\u00e1kladov\u00e1 efektivita se projevuje v koncentrac\u00edch mezi 1-200 ppm.<\/p>\n P\u0159\u00edpravky na b\u00e1zi oleje pou\u017e\u00edvaj\u00ed nosi\u010de, jako je miner\u00e1ln\u00ed olej, b\u00edl\u00fd olej nebo rostlinn\u00fd olej, kter\u00e9 z\u016fst\u00e1vaj\u00ed odd\u011blen\u00e9 od p\u011bnidla. Tyto hou\u017eevnat\u00e9 odp\u011b\u0148ova\u010de se m\u00eds\u00ed s hydrofobn\u00edmi vosky (ethylen bis stearamid, paraf\u00edny, mastn\u00e9 alkoholy) nebo hydrofobn\u00edm oxidem k\u0159emi\u010dit\u00fdm, aby l\u00e9pe fungovaly. Kombinovan\u00fd \u00fa\u010dinek hydrofobn\u00edch \u010d\u00e1stic a olej\u016f vytv\u00e1\u0159\u00ed \u201cpin-efekt\u201d, kter\u00fd pronik\u00e1 hloub\u011bji a rychleji se destabilizuje. Provozy zpracov\u00e1vaj\u00edc\u00ed pap\u00edr, \u010dist\u00edrny odpadn\u00edch vod a v\u00fdrobci n\u00e1t\u011brov\u00fdch hmot pova\u017euj\u00ed tyto odp\u011b\u0148ova\u010de na b\u00e1zi olej\u016f za u\u017eite\u010dn\u00e9 zejm\u00e9na pro odstra\u0148ov\u00e1n\u00ed povrchov\u00e9 p\u011bny.<\/p>\n P\u0159\u00edpravky na vodn\u00ed b\u00e1zi jsou sm\u011bs\u00ed r\u016fzn\u00fdch olej\u016f a vosk\u016f ve vodn\u00edch nosi\u010d\u00edch. Tyto odp\u011b\u0148ova\u010de funguj\u00ed hlavn\u011b jako odply\u0148ova\u010de, proto\u017ee uvol\u0148uj\u00ed zachycen\u00fd vzduch, m\u00edsto aby se zam\u011b\u0159ovaly na povrchovou p\u011bnu. Obsahuj\u00ed miner\u00e1ln\u00ed nebo rostlinn\u00e9 oleje spolu s mastn\u00fdmi alkoholy s dlouh\u00fdm \u0159et\u011bzcem, m\u00fddly mastn\u00fdch kyselin nebo estery. U\u017eivatel\u00e9 oce\u0148uj\u00ed jejich \u010dist\u00fd profil, kter\u00fd zanech\u00e1v\u00e1 minim\u00e1ln\u00ed zbytky a snadno se oplachuje. Emulze se m\u016f\u017ee st\u00e1t nestabiln\u00ed v extr\u00e9mn\u00edch podm\u00ednk\u00e1ch pH nebo p\u0159i vysok\u00fdch koncentrac\u00edch elektrolyt\u016f.<\/p>\n Pr\u00e1\u0161kov\u00e9 odp\u011b\u0148ova\u010de funguj\u00ed stejn\u011b jako p\u0159\u00edpravky na b\u00e1zi oleje, ale pou\u017e\u00edvaj\u00ed nosi\u010de \u010d\u00e1stic, jako je oxid k\u0159emi\u010dit\u00fd. Tyto odp\u011b\u0148ova\u010de se aktivuj\u00ed za mokra a dob\u0159e funguj\u00ed v such\u00fdch syst\u00e9mech, jako je cement, om\u00edtka a \u010distic\u00ed prost\u0159edky. XIAMETER APW-4248, pr\u00e1\u0161kov\u00fd odp\u011b\u0148ova\u010d s obsahem k\u0159em\u00edku, funguje v\u00fdjime\u010dn\u011b dob\u0159e v pr\u00e1\u0161kov\u00fdch prac\u00edch prost\u0159edc\u00edch i p\u0159i n\u00edzk\u00fdch koncentrac\u00edch, ani\u017e by b\u011bhem skladov\u00e1n\u00ed ztr\u00e1cel \u00fa\u010dinnost. V\u00fdrobci mohou tyto sypk\u00e9 granule snadno m\u00edchat suchou cestou a jejich \u00fa\u010dinnost z\u016fst\u00e1v\u00e1 zachov\u00e1na p\u0159i r\u016fzn\u00fdch typech povrchov\u011b aktivn\u00edch l\u00e1tek, \u00farovn\u00edch pH a teplot\u00e1ch pran\u00ed.<\/p>\n Kopolymern\u00ed odp\u011b\u0148ova\u010de EO\/PO (ethylenoxid\/propylenoxid) se dod\u00e1vaj\u00ed jako oleje, vodn\u00e9 roztoky nebo emulze. \u0158e\u0161\u00ed probl\u00e9my s usazeninami d\u00edky sv\u00fdm vynikaj\u00edc\u00edm disperga\u010dn\u00edm vlastnostem. DOWFAX DF-117, aktivn\u00ed polyglykol 100%, \u00fa\u010dinn\u011b reguluje tvorbu p\u011bny p\u0159i myt\u00ed zeleniny, fermentaci, zpracov\u00e1n\u00ed pap\u00edru a stavebn\u00edch materi\u00e1l\u016f. Bod z\u00e1kalu a teplota aplikace ovliv\u0148uj\u00ed, jak dob\u0159e kopolymery EO\/PO funguj\u00ed jako odp\u011b\u0148ova\u010de - formul\u00e1to\u0159i by m\u011bli vyb\u00edrat produkty s bodem z\u00e1kalu ni\u017e\u0161\u00edm, ne\u017e je teplota zam\u00fd\u0161len\u00e9ho pou\u017eit\u00ed. Tyto odp\u011b\u0148ova\u010de nab\u00edzej\u00ed m\u00edrnou regulaci p\u011bnivosti s lep\u0161\u00edmi sm\u00e1\u010dec\u00edmi schopnostmi a men\u0161\u00edm mno\u017estv\u00edm zbytk\u016f ne\u017e mo\u017enosti na b\u00e1zi silikonu.<\/p>\n V\u00fdb\u011br spr\u00e1vn\u00e9ho odp\u011b\u0148ovac\u00edho roztoku vy\u017eaduje d\u016fkladn\u00e9 testov\u00e1n\u00ed a posouzen\u00ed mnoha prom\u011bnn\u00fdch. V\u00e1\u0161 \u00fasp\u011bch z\u00e1vis\u00ed na tom, jak dob\u0159e zn\u00e1te odp\u011b\u0148ovac\u00ed prost\u0159edek i syst\u00e9m, kter\u00fd chcete o\u0161et\u0159it.<\/p>\n Testov\u00e1n\u00ed kontroly p\u011bny funguje nejl\u00e9pe pomoc\u00ed standardn\u00edch postup\u016f. Metoda Ross-Miles kontroluje, jak se p\u011bna tvo\u0159\u00ed a z\u016fst\u00e1v\u00e1 stabiln\u00ed, a to m\u011b\u0159en\u00edm v\u00fd\u0161ky p\u011bnov\u00e9ho sloupce. Dynamick\u00e1 anal\u00fdza p\u011bny sleduje, jak kapalina odt\u00e9k\u00e1, jak se m\u011bn\u00ed v\u00fd\u0161ka p\u011bny a velikost bublin. Tyto zm\u011bny ukazuj\u00ed, jak je p\u011bna stabiln\u00ed. Testy odtoku p\u011bny n\u00e1m \u0159eknou mnoho o struktu\u0159e p\u011bny. M\u011b\u0159\u00ed, jak moc se zvy\u0161uje v\u00fd\u0161ka kapaliny p\u0159i rozpadu p\u011bny.<\/p>\n Zkou\u0161en\u00ed obsahu vzduchu je nezbytn\u00e9 pro prevenci povrchov\u00fdch vad a delaminace betonu a stavebn\u00edch materi\u00e1l\u016f. Tlakov\u00e9 metody poskytuj\u00ed rychl\u00e9 a spolehliv\u00e9 v\u00fdsledky pro betonov\u00e9 sm\u011bsi s norm\u00e1ln\u00ed hmotnost\u00ed pomoc\u00ed vzduchom\u011br\u016f, kter\u00e9 vypou\u0161t\u011bj\u00ed stla\u010den\u00fd vzduch do betonov\u00e9 komory. M\u016f\u017eete tak\u00e9 pou\u017e\u00edt objemov\u00e9 metody s v\u00e1lcov\u00fdmi m\u011b\u0159i\u010di. Ty vym\u00fdvaj\u00ed vzduchov\u00e9 dutiny ze sm\u011bsi izopropylalkoholem. Rozd\u00edl hladin kapaliny ukazuje obsah vzduchu.<\/p>\n Zm\u011bny teploty mohou podstatn\u011b ovlivnit fungov\u00e1n\u00ed odp\u011b\u0148ova\u010d\u016f t\u00edm, \u017ee m\u011bn\u00ed jejich disperzn\u00ed stav a povrchov\u00e9 vlastnosti. V\u011bt\u0161ina odp\u011b\u0148ova\u010d\u016f se \u0161patn\u011b vyrovn\u00e1v\u00e1 s vysok\u00fdmi teplotami a rozpad\u00e1 se, kdy\u017e se syst\u00e9m p\u0159\u00edli\u0161 zah\u0159eje. Dal\u0161\u00edm d\u016fle\u017eit\u00fdm faktorem je \u00farove\u0148 pH - n\u011bkter\u00e9 odp\u011b\u0148ova\u010de, kter\u00e9 skv\u011ble funguj\u00ed v neutr\u00e1ln\u00edch podm\u00ednk\u00e1ch, se rychleji rozkl\u00e1daj\u00ed ve velmi kysel\u00e9m nebo z\u00e1sadit\u00e9m prost\u0159ed\u00ed. Proto je v\u00fdb\u011br odp\u011b\u0148ova\u010d\u016f s vhodn\u00fdm pH velmi d\u016fle\u017eit\u00fd.<\/p>\n R\u016fzn\u00e9 typy odp\u011b\u0148ova\u010d\u016f maj\u00ed r\u016fzn\u011b dlouhou \u017eivotnost. Ty na b\u00e1zi silikonu obvykle vydr\u017e\u00ed 12-24 m\u011bs\u00edc\u016f, zat\u00edmco typy na b\u00e1zi oleje a vody funguj\u00ed dob\u0159e 6-12 m\u011bs\u00edc\u016f. Velk\u00fd vliv na jejich \u017eivotnost maj\u00ed podm\u00ednky skladov\u00e1n\u00ed. Odp\u011b\u0148ova\u010de skladujte na chladn\u00fdch a such\u00fdch m\u00edstech mimo dosah slune\u010dn\u00edho z\u00e1\u0159en\u00ed a tepla. Krom\u011b toho pom\u00e1h\u00e1 pou\u017e\u00edvat t\u011bsn\u011b uzav\u0159en\u00e9 n\u00e1doby, aby vzduch a vlhkost neurychlily degradaci.<\/p>\n Nejrychlej\u0161\u00ed zp\u016fsob, jak vybrat odp\u011b\u0148ova\u010d, za\u010d\u00edn\u00e1 znalost\u00ed konkr\u00e9tn\u00edho probl\u00e9mu s p\u011bnou. Pod\u00edvejte se na pH va\u0161eho syst\u00e9mu, provozn\u00ed teplotu, viskozitu, chemick\u00e9 slo\u017een\u00ed a zp\u016fsob tvorby p\u011bny. Kl\u00ed\u010dov\u00e9 je spr\u00e1vn\u00e9 vyv\u00e1\u017een\u00ed kompatibility - odp\u011b\u0148ova\u010d mus\u00ed b\u00fdt dostate\u010dn\u011b nerozpustn\u00fd, aby z\u016fstal ve form\u011b rozpt\u00fdlen\u00fdch kapi\u010dek na rozhran\u00ed kapalina-vzduch, a z\u00e1rove\u0148 se mus\u00ed dostate\u010dn\u011b dob\u0159e m\u00edsit, aby se mohl \u0161\u00ed\u0159it bez probl\u00e9m\u016f. Smykov\u00e1 stabilita je obzvl\u00e1\u0161t\u011b d\u016fle\u017eit\u00e1 v syst\u00e9mech, kter\u00e9 pou\u017e\u00edvaj\u00ed \u010derpadla, vysokorychlostn\u00ed m\u00edchadla nebo st\u0159\u00edkac\u00ed trysky.<\/p>\n Kontrola p\u011bny je d\u016fle\u017eitou sou\u010d\u00e1st\u00ed, kter\u00e1 pom\u00e1h\u00e1 zefektivnit procesy a zv\u00fd\u0161it kvalitu v\u00fdrobk\u016f v pr\u016fmyslov\u00e9m prost\u0159ed\u00ed. V tomto \u010dl\u00e1nku jsme se zab\u00fdvali slo\u017eit\u00fdmi v\u011bdeck\u00fdmi poznatky o tvorb\u011b p\u011bny, zejm\u00e9na t\u00edm, jak povrchov\u011b aktivn\u00ed l\u00e1tky stabilizuj\u00ed bubliny prost\u0159ednictv\u00edm Gibbsova-Marangoniho efektu. Pochopen\u00edm t\u011bchto z\u00e1kladn\u00edch mechanism\u016f m\u016f\u017eete l\u00e9pe vyb\u00edrat a aplikovat odp\u011b\u0148ovac\u00ed prost\u0159edky.<\/p>\n Mechanismy odp\u011b\u0148ov\u00e1n\u00ed - odvlh\u010dov\u00e1n\u00ed, roztahov\u00e1n\u00ed most\u016f a destabilizace - p\u016fsob\u00ed spole\u010dn\u011b na omezen\u00ed tvorby p\u011bny v r\u016fzn\u00fdch f\u00e1z\u00edch tvorby. Ka\u017ed\u00fd mechanismus se zam\u011b\u0159uje na specifick\u00e9 vlastnosti p\u011bny, tak\u017ee v\u00fdb\u011br odp\u011b\u0148ova\u010de je sp\u00ed\u0161e p\u0159esnou v\u011bdou ne\u017e odhadem.<\/p>\n R\u016fzn\u00e9 pr\u016fmyslov\u00e9 sc\u00e9n\u00e1\u0159e prost\u011b pot\u0159ebuj\u00ed p\u0159izp\u016fsoben\u00e9 p\u0159\u00edstupy. P\u0159\u00edpravky proti p\u011bn\u011bn\u00ed na b\u00e1zi silikonu \u00fa\u010dinn\u011b funguj\u00ed ve v\u0161ech typech aplikac\u00ed, zat\u00edmco p\u0159\u00edpravky na b\u00e1zi oleje vynikaj\u00ed p\u0159i odstra\u0148ov\u00e1n\u00ed povrchov\u00e9 p\u011bny. Varianty na vodn\u00ed b\u00e1zi poskytuj\u00ed vynikaj\u00edc\u00ed uvol\u0148ov\u00e1n\u00ed vzduchu s minimem zbytk\u016f. Pr\u00e1\u0161kov\u00e9 odp\u011b\u0148ova\u010de dob\u0159e funguj\u00ed v aplikac\u00edch s cementem a detergenty a varianty na b\u00e1zi glykolu vyva\u017euj\u00ed m\u00edrn\u00e9 odp\u011b\u0148ov\u00e1n\u00ed s lep\u0161\u00edmi sm\u00e1\u010dec\u00edmi schopnostmi.<\/p>\n P\u0159ed zaveden\u00edm jak\u00e9hokoli \u0159e\u0161en\u00ed pro kontrolu p\u011bny je nutn\u00e9 prov\u00e9st d\u016fkladn\u00fd test. V\u00fd\u0161ka p\u011bny, testy odvodn\u011bn\u00ed a m\u011b\u0159en\u00ed mno\u017estv\u00ed vnesen\u00e9ho vzduchu poskytuj\u00ed cenn\u00e9 \u00fadaje o \u00fa\u010dinnosti odp\u011b\u0148ova\u010de. Citlivost na pH, teplotn\u00ed stabilita a skladovatelnost podstatn\u011b ovliv\u0148uj\u00ed re\u00e1lnou \u00fa\u010dinnost.<\/p>\n V\u011bda o odp\u011b\u0148ov\u00e1n\u00ed se neust\u00e1le vyv\u00edj\u00ed s t\u00edm, jak se pr\u016fmyslov\u00e9 procesy st\u00e1vaj\u00ed slo\u017eit\u011bj\u0161\u00edmi. Formul\u00e1to\u0159i mus\u00ed p\u0159i v\u00fdvoji nov\u00fdch \u0159e\u0161en\u00ed vyva\u017eovat kompatibilitu a nerozpustnost. Odp\u011b\u0148ova\u010d, kter\u00fd v jedn\u00e9 aplikaci funguje dokonale, m\u016f\u017ee v jin\u00e9 aplikaci zp\u016fsobit velk\u00e9 probl\u00e9my.<\/p>\n V\u00e1\u0161 \u00fasp\u011bch z\u00e1vis\u00ed na tom, zda spr\u00e1vn\u00fd odp\u011b\u0148ovac\u00ed prost\u0159edek odpov\u00edd\u00e1 specifick\u00fdm procesn\u00edm podm\u00ednk\u00e1m. M\u011bli byste myslet na provozn\u00ed parametry, chemick\u00e9 interakce a po\u017eadavky na v\u00fdkon. Spr\u00e1vn\u00e9 odp\u011b\u0148ovac\u00ed prost\u0159edky mohou zlep\u0161it efektivitu procesu, sn\u00ed\u017eit v\u00fdskyt vad a zv\u00fd\u0161it kvalitu v\u00fdrobk\u016f v pr\u016fmyslov\u00fdch odv\u011btv\u00edch v\u0161ech typ\u016f.<\/p>","protected":false},"excerpt":{"rendered":" How Industrial Defoaming Actually Works: From Theory to Practice Foam creates major problems in industrial processes. It causes defects in […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[3],"tags":[],"class_list":["post-198","post","type-post","status-publish","format-standard","hentry","category-knowledge"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/posts\/198","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/comments?post=198"}],"version-history":[{"count":1,"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/posts\/198\/revisions"}],"predecessor-version":[{"id":199,"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/posts\/198\/revisions\/199"}],"wp:attachment":[{"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/media?parent=198"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/categories?post=198"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/defoamingagent.net\/cs\/wp-json\/wp\/v2\/tags?post=198"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}Struktura okraj\u016f p\u011bnov\u00fdch lamel a plo\u0161ek<\/h3>\n
Gibbs-Marangoniho efekt ve stabilit\u011b p\u011bny<\/h3>\n
Z\u00e1kladn\u00ed mechanismy odp\u011b\u0148ova\u010d\u016f<\/h2>\n
Mechanismus zvlh\u010dov\u00e1n\u00ed a kontaktn\u00ed \u00fahel >90\u00b0<\/h3>\n
Natahov\u00e1n\u00ed most\u016f a naru\u0161en\u00ed Marangoniho toku<\/h3>\n
Destabilizace prost\u0159ednictv\u00edm adsorpce povrchov\u011b aktivn\u00edch l\u00e1tek<\/h3>\n
Vysv\u011btlen\u00ed koeficient\u016f pr\u016fniku a \u0161\u00ed\u0159en\u00ed<\/h3>\n
Typy pr\u016fmyslov\u00fdch odp\u011b\u0148ova\u010d\u016f a p\u0159\u00edpady jejich pou\u017eit\u00ed<\/h2>\n
P\u011bnidlo na b\u00e1zi silikonu pro vysoce \u00fa\u010dinn\u00e9 syst\u00e9my<\/h3>\n
Odp\u011b\u0148ova\u010d oleje s p\u0159\u00edsadami vosku nebo oxidu k\u0159emi\u010dit\u00e9ho<\/h3>\n
Protip\u011bnov\u00fd p\u0159\u00edpravek na vodn\u00ed b\u00e1zi pro uvoln\u011bn\u00ed nas\u00e1t\u00e9ho vzduchu<\/h3>\n
Pr\u00e1\u0161kov\u00fd odp\u011b\u0148ova\u010d v cementu a detergentech<\/h3>\n
Odp\u011b\u0148ova\u010de na b\u00e1zi glykolu a kopolymer\u016f EO\/PO<\/h3>\n
Testov\u00e1n\u00ed, optimalizace a probl\u00e9my s aplikacemi<\/h2>\n
Zku\u0161ebn\u00ed metody v\u00fd\u0161ky p\u011bny a odvodn\u011bn\u00ed<\/h3>\n
M\u011b\u0159en\u00ed nas\u00e1t\u00e9ho vzduchu pomoc\u00ed hustom\u011br\u016f<\/h3>\n
Probl\u00e9my s kompatibilitou s pH a teplotou<\/h3>\n
Obavy t\u00fdkaj\u00edc\u00ed se stability slo\u017een\u00ed a doby pou\u017eitelnosti<\/h3>\n
V\u00fdb\u011br spr\u00e1vn\u00e9ho odp\u011b\u0148ova\u010de pro v\u00e1\u0161 proces<\/h3>\n
Z\u00e1v\u011br<\/h2>\n