I-HEC (i-hydroxyethyl cellulose) yi-ether ye-cellulose e-nonionic esetyenziswa kakhulu kwishishini lezombatho. Imisebenzi yayo ibandakanya ukuqina, ukusabalalisa, ukumisa kunye nokuzinzisa, okunokuphucula ukusebenza kolwakhiwo kunye nefuthe lefilimu yokwenza i-coatings. I-HEC isetyenziswa ngokubanzi kwiingubo ezisekelwe emanzini ngenxa yokuba ine-solubility efanelekileyo yamanzi kunye nokuzinza kweekhemikhali.
1. Indlela yokusebenza ye-HEC
Isiphumo sokutyeba
Omnye wemisebenzi ephambili ye-HEC kwi-coatings kukuqina. Ngokunyusa i-viscosity yenkqubo yokugubungela, ukugquma kunye neempawu zokulinganisa zingaphuculwa, i-phenomenon ye-sagging ingancitshiswa, kwaye i-coating inokwenza i-uniform covering layer eludongeni okanye kwezinye iindawo. Ukongeza, i-HEC inamandla okuqina okuqina, ngoko inokufikelela kwisiphumo esifanelekileyo sokuqina nokuba sincinci songezelelo, kwaye inokusebenza kakuhle kwezoqoqosho.
Ukunqunyanyiswa kunye nokuzinzisa
Kwinkqubo yokugubungela, iinqununu eziqinileyo ezifana ne-pigments kunye nezizaliso kufuneka zihlakazwe ngokulinganayo kwizinto ezisisiseko, ngaphandle koko ziya kuchaphazela ukubonakala kunye nokusebenza kwengubo. I-HEC inokugcina ngokufanelekileyo ukuhanjiswa okufanayo kweengqungquthela eziqinileyo, ukukhusela imvula, kwaye ugcine isambatho sizinzile ngexesha lokugcinwa. Esi siphumo sokunqunyanyiswa sivumela ukuba i-coating ibuyele kwisimo esifanayo emva kokugcinwa kwexesha elide, ukunciphisa i-stratification kunye nemvula.
Ukugcinwa kwamanzi
I-HEC inokunceda amanzi epeyinti ukuba akhululwe kancinci ngexesha lenkqubo yokupeyinta, ngaloo ndlela yandisa ixesha lokumisa ipeyinti kwaye ivumele ukuba ibekwe ngokupheleleyo kwaye yenziwe ifilimu eludongeni. Lo msebenzi wokugcinwa kwamanzi kubaluleke kakhulu kwisiphumo sokwakha, ngokukodwa kwiindawo zokwakha ezishushu okanye ezomileyo, i-HEC inokunciphisa kakhulu ingxaki yokubunjwa kwefilimu engafanelekanga ebangelwa ukuguquguquka kwamanzi ngokukhawuleza.
Umgaqo weRheological
Iimpawu ze-rheological zepeyinti zichaphazela ngokuthe ngqo ukuvakalelwa kunye nomgangatho wefilimu wokwakhiwa. Isisombululo esenziwe yi-HEC emva kokunyibilika emanzini sine-pseudoplasticity, oko kukuthi, i-viscosity iyancipha phantsi kwe-high shear force (efana nokuxubha kunye nokuqengqeleka), okulula ukuxubha; kodwa i-viscosity iphinda ibuyele phantsi kwamandla aphantsi okucheba, anokunciphisa ukuthoba. Oku akuncedi nje kuphela ukwakhiwa, kodwa kuqinisekisa ukufana kunye nobukhulu bengubo.
2. Izinto eziluncedo zeHEC
Ukunyibilika kakuhle kwamanzi
I-HEC yinto yepolima enyibilikayo emanzini. Isisombululo esenziwe emva kokuchithwa sicacile kwaye sicacile, kwaye asinayo imiphumo emibi kwinkqubo yepeyinti yamanzi. I-solubility yayo iphinda inqume ukukhululeka kwayo ekusebenziseni inkqubo yepeyinti, kwaye inokunyibilika ngokukhawuleza ngaphandle kokuvelisa amaqhekeza okanye i-agglomerates.
Uzinzo lwekhemikhali
Njenge-ether ye-cellulose e-non-ionic, i-HEC inozinzo oluhle lweekhemikhali kwaye ayichaphazeli lula kwizinto ezifana ne-pH, ukushisa kunye ne-ion zetsimbi. Inokuhlala izinzile kwiindawo eziqinileyo ze-asidi kunye ne-alkaline, ngoko iyakwazi ukuziqhelanisa neentlobo ezahlukeneyo zeenkqubo zokugquma.
Ukhuseleko lokusingqongileyo
Ngokuphuculwa kolwazi lokusingqongileyo, i-VOC ephantsi (i-volatile organic compound) iya ithandwa kakhulu. I-HEC ayinayo ityhefu, ayinabungozi, ayinayo i-solvents ye-organic, kwaye ihlangabezana neemfuno zokukhusela indalo, ngoko inoluhlu olubanzi lwezicelo zokusebenzisa i-coatings esekelwe emanzini.
3. Ifuthe le-HEC kwizicelo ezibonakalayo
Iingubo zodonga zangaphakathi
Kwiingubo zangaphakathi zodonga, i-HEC njenge-thickener kunye ne-rheology modifier inokuphucula ukusebenza kokwakhiwa kwengubo, inike umgangatho omhle kunye nokubambelela. Ukongezelela, ngenxa yokugcinwa kwamanzi okugqwesileyo, i-HEC inokuthintela ukuqhekeka okanye i-powdering yeengubo zangaphakathi zodonga ngexesha lokumisa.
Iingubo zodonga zangaphandle
Iingubo zangaphandle zodonga kufuneka zibe nokuchasana kwemozulu okugqwesileyo kunye nokuxhathisa kwamanzi. I-HEC ayikwazi nje ukuphucula ukugcinwa kwamanzi kunye ne-rheology yokugqoka, kodwa iphinde ikhulise ipropati echasene ne-anti-sagging ye-coating, ukwenzela ukuba i-coating ikwazi ukuxhathisa kangcono umoya kunye nemvula emva kokwakhiwa kunye nokwandisa ubomi bayo benkonzo.
Ipeyinti yeLatex
Kwipeyinti ye-latex, i-HEC ayikwazi ukwenza nje njengento enzima, kodwa iphinde iphucule ukucolwa kwepeyinti kwaye yenza ifilimu yokugqoka ibe lula. Ngexesha elifanayo, i-HEC inokuthintela imvula yee-pigments, iphucule ukuzinza kokugcinwa kwepeyinti, kwaye yenza ipeyinti ye-latex iqine emva kokugcinwa kwexesha elide.
IV. Izilumkiso zokongeza kunye nokusebenzisa i-HEC
Indlela yokuphelisa
I-HEC idla ngokufakwa kwipeyinti kwifom ye powder. Xa usebenzisa, kufuneka ifakwe ngokuthe ngcembe emanzini kwaye ixutywe ngokupheleleyo ukuze ichithe ngokulinganayo. Ukuba ukuchithwa akwanelanga, izinto ze-granular zingabonakala, ezichaphazela ukubonakala komgangatho wepeyinti.
Ulawulo lomthamo
Isixa se-HEC kufuneka sihlengahlengiswe ngokwefomula yepeyinti kunye nesiphumo esifunekayo sokuqina. Imali eyongeziweyo ngokubanzi yi-0.3% -1.0% yemali iyonke. Ukongezwa okugqithisileyo kuya kubangela ukuba i-viscosity yepeyinti ibe phezulu kakhulu, echaphazela umsebenzi wokwakha; ukongezwa okunganelanga kuya kubangela iingxaki ezinje ngokudodobala kunye nokungonelanga kwamandla okufihla.
Ukuhambelana nezinye izithako
Xa usebenzisa i-HEC, qaphela ukuhambelana nezinye izithako zepeyinti, ngokukodwa ii-pigments, iifayili, njl. Kwiinkqubo ezahlukeneyo zepeyinti, uhlobo okanye inani le-HEC lingadinga ukulungiswa ukuze kugwenywe ukusabela okubi.
I-HEC idlala indima ebalulekileyo kwishishini lokugubungela, ngokukodwa kwiingubo ezisekelwe emanzini. Inokuphucula ukusebenza, iipropati zokwenza ifilimu kunye nokuzinza kokugcinwa kweengubo, kwaye inozinzo oluhle lweekhemikhali kunye nokukhuselwa kwendalo. Njengesiguquli esinexabiso eliphantsi kunye ne-rheology modifier, i-HEC isetyenziswa ngokubanzi kwiingubo zangaphakathi zodonga, iingubo zangaphandle kunye neepeyinti ze-latex. Kwizicelo ezisebenzayo, ngolawulo olufanelekileyo lwedosi kunye neendlela ezichanekileyo zokunyibilika, i-HEC inokubonelela ngeziphumo ezifanelekileyo zokujiya kunye nokuzinzisa kwezambatho kunye nokuphucula ukusebenza ngokubanzi kweengubo.
Ixesha lokuposa: Nov-01-2024