1. Mai kauri mara tsari
Wanda aka fi amfani da shi shine bentonite na halitta, wanda babban sinadarinsa shine montmorillonite. Tsarinsa na musamman na lamellar zai iya ba da murfin da ƙarfi mai ƙarfi na pseudoplasticity, thixotropy, kwanciyar hankali na dakatarwa da kuma maiko. Ka'idar kauri ita ce foda yana shan ruwa kuma yana kumbura don ya yi kauri lokacin ruwa, don haka yana da takamaiman riƙe ruwa.
Rashin kyawun su ne: rashin kyawun kwarara da kuma aikin daidaita su, ba su da sauƙin warwatsewa da ƙarawa.
2. Cellulose
Mafi yawan amfani shine hydroxyethyl cellulose (wanda aka fi amfani da shi a cikinHEC), wanda ke da ingantaccen kauri, kyakkyawan dakatarwa, watsawa da kuma riƙe ruwa, musamman don ƙara kauri a matakin ruwa.
Rashin kyawun su ne: yana shafar juriyar ruwa na rufin, rashin isasshen aikin hana mold, da kuma rashin ingantaccen aikin daidaita shi.
3. Acrylic
Ana raba masu kauri na acrylic zuwa nau'i biyu: masu kauri na acrylic alkali mai narkewa (ASE) da masu kauri na alkali mai narkewa (HASE).
Ka'idar kauri na acrylic acid alkali-swellable thickener (ASE) ita ce a raba carboxylate lokacin da aka daidaita pH zuwa alkaline, ta yadda sarkar kwayoyin halitta za ta faɗaɗa daga helical zuwa sanda ta hanyar isotropic electrostatic repulsion tsakanin carboxylate ions, wanda ke inganta danko na matakin ruwa. Wannan nau'in kauri kuma yana da ingantaccen kauri, ƙarfin pseudoplasticity da kyakkyawan dakatarwa.
Mai kauri mai laushi na alkali (HASE) yana gabatar da ƙungiyoyin hydrophobic bisa ga masu kauri na alkali (ASE). Hakazalika, lokacin da aka daidaita pH zuwa alkaline, tura wutar lantarki tsakanin ions na carboxylate yana haifar da sarkar kwayoyin halitta ta tashi daga siffar helical zuwa siffar sanda, wanda ke ƙara danko na matakin ruwa; kuma ƙungiyoyin hydrophobic da aka gabatar akan babban sarkar na iya haɗawa da barbashi na latex don ƙara danko na matakin emulsion.
Rashin amfani sune: yana da sauƙin amsawa ga pH, ƙarancin kwarara da matakin fim ɗin fenti, mai sauƙin kauri bayan an yi amfani da shi.
4. Polyurethane
Mai kauri mai hadewa na polyurethane (HEUR) wani polymer ne mai narkewar ruwa wanda aka gyara shi ta hanyar hydrophobic wanda aka gyara shi ta hanyar ethoxylated polyurethane, wanda ke cikin mai kauri mai hadewa mara ionic. Ya ƙunshi sassa uku: tushen hydrophobic, sarkar hydrophilic da tushen polyurethane. Tushen polyurethane yana faɗaɗa a cikin ruwan fenti, kuma sarkar hydrophilic tana da ƙarfi a cikin lokacin ruwa. Tushen hydrophobic yana haɗuwa da tsarin hydrophobic kamar barbashi na latex, surfactants, da pigments., yana samar da tsarin hanyar sadarwa mai girma uku, don cimma manufar kauri.
Yana da alaƙa da kauri na matakin emulsion, kyakkyawan aiki na kwarara da daidaita shi, ingantaccen kauri da kuma ajiyar danko mai karko, kuma babu iyaka ga pH; kuma yana da fa'idodi bayyanannu a cikin juriyar ruwa, sheƙi, bayyanawa, da sauransu.
Rashin amfani da shi shine: a cikin tsarin matsakaici da ƙarancin ɗanko, tasirin hana daidaitawa akan foda ba shi da kyau, kuma tasirin kauri yana iya shafar masu rarrabawa da masu narkewa cikin sauƙi.
Lokacin Saƙo: Disamba-29-2022