Ingxaki yokwehla kwe-viscosity ngexesha lokugcina ipeyinti yingxaki eqhelekileyo, ingakumbi emva kokugcinwa ixesha elide, i-viscosity yepeyinti iyancipha kakhulu, nto leyo echaphazela ukusebenza kolwakhiwo kunye nomgangatho wemveliso. Ukwehla kwe-viscosity kunxulumene nezinto ezininzi, ezinje ngobushushu, ukufuma, ukuguquguquka kwe-solvent, ukuwohloka kwe-polymer, njl.njl., kodwa ukusebenzisana ne-thickener cellulose ether kubaluleke kakhulu.
1. Indima esisiseko ye-cellulose ether
I-Cellulose ether sisithambisi esiqhelekileyo esisetyenziswa kakhulu kwiipeyinti ezisekelwe emanzini. Imisebenzi yazo ephambili ibandakanya:
Isiphumo sokutyeba: I-Cellulose ether inokwenza isakhiwo senethiwekhi esidumbileyo esinemilinganiselo emithathu ngokufunxa amanzi, ngaloo ndlela inyusa i-viscosity yenkqubo kwaye iphucule ukusebenza kwe-thixotropy kunye nokusebenza kokwakhiwa kwepeyinti.
Isiphumo sokuzinzisa ukumiswa: I-Cellulose ether inokuthintela ngempumelelo ukutsalwa kweenxalenye eziqinileyo ezifana neepigments kunye nezizalisi kwipeyinti kwaye igcine ukufana kwepeyinti.
Ipropati yokwenza ifilimu: I-Cellulose ether inokuchaphazela nepropati yokwenza ifilimu yepeyinti, okwenza ukuba ipeyinti ibe nokuqina okuthile kunye nokuqina.
Kukho iintlobo ezininzi ze-cellulose ethers, kuquka i-methyl cellulose (MC), i-hydroxyethyl cellulose (HEC), i-hydroxypropyl methyl cellulose (HPMC), njl. Ezi zinto zinobunyibiliko obahlukeneyo, amandla okutyeba kunye nokumelana nokugcinwa kwiingubo.
2. Izizathu eziphambili zokunciphisa i-viscosity
Ngexesha lokugcina iingubo, ukunciphisa i-viscosity kubangelwa ikakhulu zezi zizathu zilandelayo:
(1) Ukubola kwee-ether ze-cellulose
Isiphumo sokutyeba kwee-cellulose ethers kwiingubo zixhomekeke kubukhulu bobunzima bazo beemolekyuli kunye nokuthembeka kwesakhiwo sazo semolekyuli. Ngexesha lokugcina, izinto ezifana nobushushu, i-acidity kunye ne-alkalinity, kunye neentsholongwane zinokubangela ukuwohloka kwee-cellulose ethers. Umzekelo, ngexesha lokugcina ixesha elide, izinto ze-acidic okanye ze-alkaline kwingubo zinokufaka i-hydrolyze kwi-molecular chain ye-cellulose ether, zinciphise ubunzima bayo beemolekyuli, kwaye ngaloo ndlela zenze buthathaka isiphumo sayo sokutyeba, nto leyo ebangela ukwehla kwe-viscosity.
(2) Ukuguquguquka kwe-solvent kunye nokufuduka komswakama
Ukuwohloka kwesinyibilikisi okanye ukufuduka komswakama kwi-coating kunokuchaphazela imeko yokunyibilika kwe-cellulose ether. Ngexesha lokugcina, inxalenye yamanzi inokufuma okanye ifudukele kumphezulu we-coating, okwenza ukusasazwa kwamanzi kwi-coating kungalingani, ngaloo ndlela ichaphazela izinga lokudumba kwe-cellulose ether kwaye ibangele ukwehla kwe-viscosity kwiindawo zasekuhlaleni.
(3) Uhlaselo lweentsholongwane
Ukukhula kweentsholongwane kunokwenzeka kwi-coating xa igcinwe ngendlela engafanelekanga okanye izithinteli zingasebenzi. Iintsholongwane zinokubolisa ii-cellulose ethers kunye nezinye izinto eziqinisayo eziphilayo, zenze buthathaka isiphumo sazo sokutyeba kwaye zibangele ukuba i-viscosity ye-coating yehle. Ii-coating ezisekelwe emanzini, ngakumbi, ziyindawo elungileyo yokukhula kweentsholongwane kuba ziqulathe amanzi amaninzi.
(4) Ukwaluphala kobushushu obuphezulu
Phantsi kweemeko zokugcina ubushushu obuphezulu, ulwakhiwo lomzimba okanye lweekhemikhali lwe-cellulose ether molecular chain lunokutshintsha. Umzekelo, ii-cellulose ethers zisengozini ye-oxidation okanye i-pyrolysis kubushushu obuphezulu, nto leyo ebangela ukuba isiphumo sokutyeba sibe buthathaka. Ubushushu obuphezulu bukwakhawulezisa ukuguquguquka kwe-solvent kunye nokuphuma kwamanzi, nto leyo echaphazela ngakumbi uzinzo lwe-viscosity.
3. Iindlela zokuphucula uzinzo lokugcina izinto ezigqunyiweyo
Ukuze kuncitshiswe ukuncipha kwe-viscosity ngexesha lokugcina nokwandisa ubomi bokugcina bengubo, la manyathelo alandelayo anokuthathwa:
(1) Ukukhetha i-cellulose ether efanelekileyo
Iindidi ezahlukeneyo zee-cellulose ethers zineentsebenzo ezahlukeneyo ngokubhekiselele ekuzinzeni kwendawo yokugcina. Ii-cellulose ethers ezinobunzima obukhulu beemolekyuli zihlala zineziphumo ezingcono zokutyeba, kodwa ukuzinza kwazo kwindawo yokugcina akukuhle kangako, ngelixa ii-cellulose ethers ezinobunzima obuphantsi beemolekyuli zinokuba nokusebenza okungcono kwendawo yokugcina. Ke ngoko, xa kuyilwa le fomula, kufuneka kukhethwe ii-cellulose ethers ezinozinzo oluhle kwindawo yokugcina, okanye ii-cellulose ethers kufuneka zidityaniswe nezinye izinto zokutyeba ukuphucula ukumelana kwazo nendawo yokugcina.
(2) Lawula i-pH yokwaleka
I-acidity kunye ne-alkalinity yenkqubo yokugquma inefuthe elibalulekileyo ekuzinzeni kwee-ether ze-cellulose. Kuyilo lwefomyula, ixabiso le-pH yengubo kufuneka lilawulwe ukuze kuthintelwe imeko-bume ene-acidity eninzi okanye i-alkaline ukunciphisa ukonakala kwee-ether ze-cellulose. Kwangaxeshanye, ukongeza isixa esifanelekileyo se-pH adjuster okanye i-buffer kunokunceda ukuzinzisa i-pH yenkqubo.
(3) Ukwandisa ukusetyenziswa kwezithinteli
Ukuze kuthintelwe ukukhukuliseka kweentsholongwane, kufuneka kongezwe isixa esifanelekileyo sezinto zokugcina ulwelo kwingubo. Izinto zokugcina ulwelo zinokuthintela ukukhula kweentsholongwane, ngaloo ndlela zithintele izinto eziphilayo ezifana ne-cellulose ether ukuba zingaboli kwaye zigcine uzinzo lwengubo. Izinto zokugcina ulwelo ezifanelekileyo kufuneka zikhethwe ngokwendlela ekwakhiwe ngayo ingubo kunye nendawo yokugcina, kwaye ukusebenza kwazo kufuneka kuhlolwe rhoqo.
(4) Lawula indawo yokugcina izinto
Ubushushu bokugcina kunye nokufuma kwengubo kunempembelelo ngqo ekuzinzeni kwe-viscosity. Ingubo kufuneka igcinwe kwindawo eyomileyo nepholileyo, kuthintelwe ubushushu obuphezulu kunye neemeko zokufuma okuphezulu ukunciphisa ukuguquguquka kwe-solvent kunye nokubola kwe-cellulose ether. Ukongeza, ukupakisha okuvalwe kakuhle kunokunciphisa ngempumelelo ukufuduka kunye nokuphuma kwamanzi kwaye kulibazise ukwehla kwe-viscosity.
4. Ezinye izinto ezichaphazela ukuxinana
Ukongeza kwi-cellulose ethers, ezinye izinto ezikwinkqubo yokugquma nazo zinokuchaphazela utshintsho kwi-viscosity. Umzekelo, uhlobo kunye noxinzelelo lwee-pigment, izinga lokuwohloka kwezinyibilikisi, kunye nokuhambelana kwezinye izinto ezithina okanye ezisasaza izinto kunokuchaphazela ukuzinza kwe-viscosity yengubo. Ke ngoko, uyilo olupheleleyo lwefomyula yokugquma kunye nokusebenzisana phakathi kwezinto nazo zizinto ezibalulekileyo ekufuneka ziqwalaselwe.
Ukwehla kwe-viscosity ngexesha lokugcina i-coating kunxulumene kakhulu nezinto ezinje ngokonakala kwe-cellulose ethers, ukuguquguquka kwe-solvent, kunye nokufuduka kwamanzi. Ukuze kuphuculwe uzinzo lokugcina i-coating, kufuneka kukhethwe iintlobo ezifanelekileyo ze-cellulose ether, i-pH ye-coating ilawulwe, amanyathelo okulwa nokugqwala kufuneka aqiniswe, kwaye indawo yokugcina kufuneka iphuculwe. Ngokuyila ifomyula efanelekileyo kunye nolawulo oluhle lokugcina, ingxaki yokuncipha kwe-viscosity ngexesha lokugcina i-coating inokunciphisa ngempumelelo, kwaye ukusebenza kwemveliso kunye nokukhuphisana kwimarike kunokuphuculwa.
Ixesha leposi: Sep-27-2024