I-hydroxyethyl cellulose iyichaphazela njani i-viscosity?

I-Hydroxyethyl cellulose (HEC)yipolymer engeyiyo ionic, enyibilikayo emanzini eyenziwe nge-cellulose yendalo ngokusebenzisa i-etherification. Ngenxa yokuba yenza isisombululo se-colloidal esicacileyo nesizinzileyo xa sinyibilikiswa emanzini, sisetyenziswa kakhulu kwiingubo, kwiikhemikhali zasekhaya, kwizinto zokwakha, ekubholeni ioyile, nakwezinye iindawo. Impembelelo ye-HEC kwi-viscosity yenkqubo ngomnye wemisebenzi yayo ebaluleke kakhulu, kwaye le mpembelelo ibandakanya izinto ezininzi, kubandakanya ulwakhiwo lweemolekyuli, ukunyibilika, kunye neemeko zangaphandle.

1. Ubudlelwane phakathi koBume beeMolekyuli kunye nokuxinana

Ikhonkco eliphambili le-HEC ngumqolo we-cellulose oqhagamshelwe zii-β-1,4-glucose bonds, kunye namaqela e-hydroxyl kwiiyunithi zeglucose athatyathelwe indawo ngamaqela e-hydroxyethyl. Iqondo lokutshintshwa (DS) kunye nokutshintshwa kwe-molar (MS) zimisela ukunyibilika kwemolekyuli emanzini kunye nokuguquguquka kwezigaba zekhonkco. Iitsheyini zemolekyuli ezinde (ubunzima bemolekyuli obuphezulu) kunye neqondo eliphakathi lokutshintshwa zibangela ukuxinana okungakumbi emva kokufakelwa kwamanzi, okwandisa kakhulu i-viscosity yenkqubo. I-HEC enobunzima bemolekyuli obuphezulu ivelisa i-viscosity ephezulu kakhulu kuneentlobo ezinobunzima bemolekyuli obuphantsi kuxinzelelo olufanayo.

2. Iinkqubo zokunyibilika kunye nokufuma kwamanzi zichaphazela ukuxinana

Inkqubo yokunyibilika kwe-HEC emanzini ibandakanya amanqanaba amathathu: ukumanzisa, ukusasazwa, kunye nokufuma. Xa umgubo we-HEC udibana namanzi, umaleko ongaphandle ufunxa amanzi ngoko nangoko uze wande ukuze wenze ifilimu, kulandele ukufuma kancinci komaleko ongaphakathi. Emva kokufuma ngokupheleleyo, iimolekyuli zetyathanga elide zisasazeka ngokulinganayo emanzini, zenze isisombululo esinesakhiwo senethiwekhi yendawo esithintela ukuhamba kweemolekyuli zamanzi, ngaloo ndlela sonyusa ukufuma kwesisombululo. Ukuba ukunyibilika akuphelelanga okanye kwenzeka ukuhlangana, iitsheyini zemolekyuli azivulekanga ngokupheleleyo, nto leyo ebangela ukufuma okuphantsi.

3. Ubudlelwane phakathi kokugxila kunye nokuxinana

Kwinqanaba eliphantsi loxinzelelo, i-HEC viscosity iyanda malunga nomgca ngokunyuka koxinzelelo. Xa uxinzelelo lufikelela kuxinzelelo olubalulekileyo loxinzelelo, uxinano oluninzi lwenzeka phakathi kwee-molecular chains, kwaye i-viscosity iyanda ngokukhawuleza. Uxinano oluphezulu kakhulu lunokubangela ukuba isisombululo sibonise imeko efana nejeli, nto leyo enciphisa kakhulu ukugeleza kwamanzi. Ke ngoko, kwizicelo ezisebenzayo, kufuneka kukhethwe idosi efanelekileyo ngokusekelwe kwiimfuno zenkqubo ukuze kufezekiswe i-viscosity ekujoliswe kuyo.

4. Iziphumo zeemeko zangaphandle kwi-viscosity

Ubushushu: Ubushushu bezisombululo ze-HEC buyancipha xa ubushushu busanda. Oku kungenxa yokuba ubushushu obuphezulu buqinisa intshukumo yobushushu beetsheyini ze-molecular, nto leyo enciphisa uzinzo lomaleko wokufunxa amanzi. I-pH: Ubushushu be-HEC buzinzile ngaphakathi koluhlu lwe-pH oluphakathi kwe-2-12, kodwa iimeko ze-asidi kunye ne-alkaline ezigqithisileyo zinokuphazamisa iitsheyini ze-molecular, nto leyo ekhokelela ekunciphiseni ubushushu.

Iityuwa kunye nezinyibilikisi: Njenge-polymer engeyiyo i-ionic, i-HEC izinzile xa kukho ii-electrolytes. Nangona kunjalo, ubuninzi beetyuwa okanye izinyibilikisi zendalo bunokuchaphazela ukufuma kwamanzi, ngaloo ndlela kunciphisa i-viscosity.

5. Ulawulo lwe-Viscosity kwiiNkqubo ezahlukeneyo

Ishishini leeCoatings: I-HEC ibonelela ngeempawu ezifanelekileyo zokufaka i-viscosity kunye ne-leveling kwipeyinti ye-latex, ithintela ukuqina kwe-pigment kunye ne-filler.
Iikhemikhali zasekhaya: Kwishampu nakwisepha yesandla, i-HEC inika ubumbano oluthambileyo kwaye iqinisa igwebu.
Izixhobo zokwakha: Kwisigqubuthelo sesamente, i-HEC ibonelela ngokugcinwa kwamanzi kunye nokuhambelana, nto leyo ephucula ukusebenza kokusetyenziswa.
Ukubhola ngeoyile: I-HEC isetyenziswa kulwelo lokubhola ukulungisa i-rheology kunye nokuphucula amandla okuthwala iitshiphusi.

I-Hydroxyethyl cellulose inyusa kakhulu i-viscosity yenkqubo ngokusebenzisa i-hydration, i-entanglement, kunye nokwakheka kwenethiwekhi yendawo yee-molecules zayo ezinde emanzini. I-viscosity ayihambelani nje kuphela nobunzima bee-molecular ze-HEC, inqanaba lokutshintshwa, kunye noxinzelelo, kodwa ikwachaphazeleka bubushushu, i-pH, kunye nokwakheka kwenkqubo. Kuyilo lwe-formulation,ukukhetha ngokufanelekileyo uhlobo lwe-HECkunye nomthamo uvumela ulawulo oluchanekileyo lweempawu ze-rheological zemveliso, ukufezekisa iziphumo ezahlukeneyo ukusuka kuncinci ukuya kubukhulu.