I-phenomenon ye-viscosity drop ngexesha lokugcinwa kwepeyinti yingxaki eqhelekileyo, ngakumbi emva kokugcinwa kwexesha elide, i-viscosity yepeyinti iyancipha kakhulu, echaphazela ukusebenza kokwakhiwa kunye nomgangatho wemveliso. Ukuncipha kwe-viscosity kuhambelana nezinto ezininzi, ezifana nobushushu, ukufuma, ukuchithwa kwe-solvent, ukuchithwa kwe-polymer, njl., kodwa ukusebenzisana ne-thickener cellulose ether kubaluleke kakhulu.
1. Indima esisiseko ye-cellulose ether
I-ether ye-Cellulose yinto eqhelekileyo esetyenziswa kakhulu kwiipeyinti ezisekelwe emanzini. Imisebenzi yabo ephambili ibandakanya:
Impembelelo yokuqina: I-ether ye-Cellulose inokwenza i-slollen-dimensional network structure ngokufunxa amanzi, ngaloo ndlela ikhulise i-viscosity yenkqubo kunye nokuphucula i-thixotropy kunye nokusebenza kokwakhiwa kwepeyinti.
Isiphumo sokumisa ukumiswa: I-ether ye-cellulose inokuthintela ngokufanelekileyo ukuchithwa kweengqungquthela eziqinileyo ezifana ne-pigments kunye nezigcwalisi kwipeyinti kunye nokugcina ukufana kwepeyinti.
Ipropathi yokwenza ifilimu: I-ether ye-cellulose inokuchaphazela kwakhona ipropati yokwenza ifilimu yepeyinti, okwenza i-coating ibe nobunzima obuthile kunye nokuqina.
Kukho iintlobo ezininzi ze-cellulose ethers, kubandakanywa i-methyl cellulose (MC), i-hydroxyethyl cellulose (HEC), i-hydroxypropyl methyl cellulose (HPMC), njl. Ezi zixhobo zine-solubility eyahlukileyo, amandla okuqina kunye nokumelana nokugcinwa kwiingubo.
2. Izizathu eziphambili zokunciphisa i-viscosity
Ngexesha lokugcinwa kweengubo, ukunciphisa i-viscosity kubangelwa ikakhulu ngenxa yezizathu ezilandelayo:
(1) Ukuthotywa kwee-ether ze-cellulose
Umphumo wokuqina we-cellulose ethers kwiingubo kuxhomekeke kubukhulu bobunzima be-molecular and integrity of their molecular structure. Ngexesha lokugcinwa, izinto ezifana neqondo lokushisa, i-asidi kunye ne-alkalinity, kunye ne-microorganisms zingabangela ukuthotywa kwe-cellulose ethers. Ngokomzekelo, ngexesha lokugcinwa kwexesha elide, i-acidic okanye i-alkaline components in the coating can hydrolyze the chain molecular of cellulose ether, ukunciphisa ubunzima bayo be-molecular, kwaye ngaloo ndlela yenza buthathaka umphumo wayo wokuqina, okukhokelela ekunciphiseni kwe-viscosity.
(2) I-solvent volatilization kunye nokufuduka komswakama
I-solvent volatilization okanye ukufuduka komswakama kwi-coating kunokuchaphazela imeko yokunyibilika kwe-cellulose ether. Ngexesha lokugcinwa, inxalenye yamanzi inokuthi ibe ngumphunga okanye ifudukele kumphezulu we-coating, yenza ukuhanjiswa kwamanzi kwi-coating ingalingani, ngaloo ndlela ichaphazela iqondo lokudumba kwe-cellulose ether kwaye ibangele ukuhla kwe-viscosity kwiindawo zendawo.
(3) Uhlaselo lweMicrobial
Ukukhula kwe-Microbial kungenzeka kwi-coating xa ingagcinwanga ngokufanelekileyo okanye izigcini zingasebenzi. IiMicroorganisms zinokubola i-cellulose ethers kunye nezinye i-organic thickeners, zenza buthathaka umphumo wazo wokuqina kwaye zibangele ukuba i-viscosity ye-coating iyancipha. Iingubo ezisekelwe emanzini, ngokukodwa, yindawo efanelekileyo yokukhula kwe-microbial kuba iqulethe inani elikhulu lamanzi.
(4) Ukuguga kobushushu obuphezulu
Ngaphantsi kweemeko zokugcina ukushisa okuphezulu, isakhiwo somzimba okanye sekhemikhali se-cellulose ether ye-molecular chain inokutshintsha. Umzekelo, i-cellulose ethers ithanda ukufakwa kwi-oxidation okanye i-pyrolysis kumaqondo obushushu aphezulu, okukhokelela ekubeni buthathaka kwesiphumo sokuqina. Amaqondo obushushu aphezulu nawo akhawulezisa ukunyibilika kwe-solvent kunye nokuphuma kwamanzi, okuchaphazela ngakumbi ukuzinza kwe-viscosity.
3. Iindlela zokuphucula ukuzinza kokugcinwa kweengubo
Ukuze kuncitshiswe ukuhla kwe-viscosity ngexesha lokugcinwa kunye nokwandisa ubomi bokugcinwa kwengubo, la manyathelo alandelayo anokuthathwa:
(1) Ukukhetha i-ether cellulose efanelekileyo
Iindidi ezahlukeneyo ze-cellulose ethers zineentsebenzo ezahlukeneyo ngokubhekiselele kuzinzo lokugcina. I-cellulose ethers ezinobunzima obuphezulu be-molecular ngokubanzi zineempembelelo ezingcono zokuqina, kodwa ukuzinza kwazo kokugcinwa kuncinci, ngelixa i-cellulose ethers ezinobunzima obuphantsi be-molecular inokuba nokusebenza okungcono kokugcinwa. Ngoko ke, xa uyila ifomula, ii-ether ze-cellulose ezinozinzo olufanelekileyo lokugcina kufuneka zikhethwe, okanye i-cellulose ethers kufuneka idityaniswe nezinye i-thickeners ukuphucula ukuxhathisa kwazo.
(2) Lawula i-pH yokugquma
I-acidity kunye ne-alkalinity yenkqubo yokugquma inefuthe elibalulekileyo ekuzinzeni kwe-cellulose ethers. Kuyilo lokuyila, ixabiso le-pH lokugquma kufuneka lilawulwe ukunqanda i-acidic egqithisileyo okanye indawo ene-alkaline ukuze kuncitshiswe ukuthotywa kwe-cellulose ethers. Kwangaxeshanye, ukongeza isixa esifanelekileyo sesilungelelaniso se-pH okanye isithinteli kunokunceda ukuzinzisa i-pH yenkqubo.
(3) Ukwandisa ukusetyenziswa kwezithinteli
Ukuze kuthintelwe ukukhukuliseka kwe-microbial, isixa esifanelekileyo se-preservatives kufuneka songezwe kwi-coating. Izilondolozo zinokunqanda ukukhula kwee-microorganisms, ngaloo ndlela zikhusela izinto eziphilayo ezifana ne-cellulose ether ukuba zingaboli kwaye zigcine ukuzinza kwengubo. Izilondolozo ezifanelekileyo kufuneka zikhethwe ngokuhambelana nokwakhiwa kwengubo kunye nokugcinwa kwendawo, kwaye ukusebenza kwazo kufuneka kuhlolwe rhoqo.
(4) Lawula indawo yokugcina
Iqondo lokushisa lokugcina kunye nomswakama wengubo inefuthe elithe ngqo kwi-viscosity stability. Ukugquma kufuneka kugcinwe kwindawo eyomileyo nepholileyo, ukuphepha ukushisa okuphezulu kunye neemeko zokufuma okuphezulu ukunciphisa i-solvent volatilization kunye ne-cellulose ether degradation. Ukongeza, ukupakishwa okutywinwe kakuhle kunokunciphisa ngokufanelekileyo ukufuduka kunye nokunyuka kwamanzi kunye nokulibazisa ukuhla kwe-viscosity.
4. Ezinye izinto ezichaphazela i-viscosity
Ukongeza kwi-ethers ye-cellulose, amanye amacandelo kwinkqubo yokugqoka inokuchaphazela kwakhona utshintsho kwi-viscosity. Ngokomzekelo, uhlobo kunye nokugxininiswa kwee-pigments, izinga lokunyuka kwe-solvents, kunye nokuhambelana kwamanye ama-thickeners okanye i-dispersants kunokuchaphazela ukuzinza kwe-viscosity ye-coating. Ke ngoko, uyilo olulonke lwefomula yokwambathisa kunye nokusebenzisana phakathi kwamacandelo nawo ngamanqaku aphambili ekufuneka aqwalaselwe.
Ukuncipha kwe-viscosity ngexesha lokugcinwa kwengubo kuhambelana ngokusondeleyo nezinto ezifana nokuthotywa kwe-cellulose ethers, i-solvent volatilization, kunye nokufuduka kwamanzi. Ukuze kuphuculwe ukuzinza kokugcinwa kwengubo, iintlobo ezifanelekileyo ze-cellulose ether kufuneka zikhethwe, i-pH yengubo kufuneka ilawulwe, amanyathelo okulwa nokubola kufuneka aqiniswe, kwaye indawo yokugcina kufuneka iphuculwe. Ngoyilo olufanelekileyo lwefomula kunye nolawulo olululo logcino, ingxaki yokuncipha kwe-viscosity ngexesha lokugcinwa kwengubo inokuncipha ngokusebenzayo, kunye nokusebenza kwemveliso kunye nokukhuphisana kwemarike kunokuphuculwa.
Ixesha lokuposa: Sep-27-2024