Eter cellulose waa unug polymer ah oo laga soo saaray cellulose dabiiciga ah iyada oo loo marayo habka etherification, waana dhumuc aad u fiican iyo wakiilka biyaha.
Ethers Cellulose ayaa si weyn loogu isticmaalay hoobiye-isku-dhafka qallalan sannadihii la soo dhaafay, kuwa ugu badan ee loo isticmaalo waa qaar ka mid ah ethers cellulose aan-ionic ahayn, oo ay ku jiraan methyl cellulose ether (MC), hydroxyethyl cellulose ether (HEC), hydroxyethyl cellulose ether Methyl cellulose ether (HEMC). ) iyo hydroxypropyl methyl cellulose ether (HPMC). Waqtigan xaadirka ah, ma jiraan suugaano badan oo ku saabsan habka cabbirka ee viscosity of cellulose ether xal. Waddankeena, kaliya halbeegyada qaar iyo monographs ayaa qeexaya habka tijaabada ee viscosity ee xalka ether cellulose.
Diyaarinta Methyl Cellulose Ether Solution
Methyl cellulose ethers waxay tixraacaan ethers cellulose ka kooban kooxaha methyl ee molecule, sida MC, HEMC iyo HPMC. Sababtoo ah hydrophobicity ee kooxda methyl, xalalka ether cellulose oo ay ku jiraan kooxaha methyl waxay leeyihiin sifooyin kuleyl ah, taas oo ah, waxay ku milmi karaan biyaha kulul heerkul ka sarreeya heerkulkooda gelation (qiyaastii 60-80 ° C). Si looga hortago in xalka etherka cellulose uu sameeyo agglomerates, kuleyli biyaha ka sarreeya heerkulka jel, qiyaastii 80 ~ 90 ° C, ka dibna ku dar budada etherka cellulose biyaha kulul, walaaq si aad u kala firdhiso, sii walaaq oo qabooji heerkulka, waxaa loo diyaarin karaa galay xal ether cellulose labis ah.
Si looga fogaado agglomeration of ether cellulose inta lagu guda jiro habka kala diri, saarayaasha mararka qaarkood fuliyaan daaweynta dusha kiimikada on alaabta ether cellulose budada ah si ay u daahiyaan kala diri. Nidaamkeeda kala diridda waxay dhacdaa ka dib marka ether-ka cellulose si buuxda loo kala firdhiyo, markaa si toos ah ayaa loogu kala firdhi karaa biyo qabow oo leh qiimaha pH dhexdhexaad ah iyada oo aan la samayn agglomerates. Qiimaha pH ee ugu sarreeya ee xalku, waa gaaban yahay wakhtiga kala dirida etherka cellulose leh sifooyinka kala dirida. Ku hagaaji qiimaha pH ee xalka qiime sare. Alkalinity wuxuu baabi'in doonaa milanka daahitaanka ether-ka cellulose, taasoo keenaysa ether-ka cellulose si uu u sameeyo agglomerates marka la kala diro. Sidaa darteed, qiimaha pH ee xalka waa in kor loo qaado ama hoos loo dhigaa ka dib marka etherka cellulose si buuxda loo kala firdhiyo.
Diyaarinta Hydroxyethyl Cellulose Ether Solution
Xalka Hydroxyethyl cellulose ether (HEC) ma laha hantida gelation kulaylka, sidaas darteed, HEC iyada oo aan daaweynta dusha sare waxay sidoo kale samayn doontaa agglomerates biyo kulul. Wax-soo-saarayaashu guud ahaan waxay ku sameeyaan daaweynta dusha kiimikada HEC budada ah si ay u daahiyaan kala dirida, si ay si toos ah ugu firdhiso biyo qabow oo leh qiimaha pH dhexdhexaad ah iyada oo aan la samayn agglomerates. Sidoo kale, xalka leh alkalinity sare, HEC Waxa kale oo ay samayn kartaa agglomerates sababtoo ah luminta milanka daahitaanka. Maadaama dareeraha sibidhka uu yahay alkaline ka dib fuuqbaxa iyo qiimaha pH ee xalku waa inta u dhaxaysa 12 iyo 13, heerka kala dirida etherka cellulose ee dusha lagu daaweeyay ee dareeraha sibidhka ayaa sidoo kale aad u dhaqso badan.
Gabagabo iyo Falanqeyn
1. Habka kala firdhisanaanta
Si looga fogaado saameynta xun ee waqtiga imtixaanka sababtoo ah si tartiib ah u milmidda walxaha daaweynta dusha, waxaa lagu talinayaa in la isticmaalo biyo kulul si loogu diyaariyo.
2. Habka qaboojinta
Xalalka ether-ka Cellulose waa in la walaaqaa oo la qaboojiyaa heerkulka deegaanka si loo yareeyo heerka qaboojinta, taas oo u baahan waqtiyo tijaabo ah oo la dheereeyey.
3. Habka kicinta
Ka dib marka etherka cellulose lagu daro biyaha kulul, hubi inaad sii walaaqdo. Marka heerkulka biyuhu hoos uga dhaco heerkulka jel, ether-ka cellulose wuxuu bilaabi doonaa inuu milo, xalkuna wuxuu si tartiib tartiib ah u noqon doonaa viscous. Waqtigaan, xawaaraha kicinta waa in la dhimo. Ka dib marka xalku gaadho wax yar oo viscosity ah, waxa uu u baahan yahay in uu istaago in ka badan 10 saacadood ka hor inta aanay goobooyinku si tartiib ah u sabbayn dusha sare si ay u qarxaan una baaba'aan.
4. Habka fuuq-celinta
Tayada etherka cellulose iyo biyaha waa in si sax ah loo cabbiraa, iskuna day inaadan sugin xalka si uu u gaaro viscosity sare ka hor inta aan la buuxin biyaha.
5. Tijaabada viscosity
Sababtoo ah thixotropy of cellulose ether solution, marka la tijaabinayo viscosity, marka rotor ee viscometer wareeg ah la geliyo xalka, waxay carqaladeyn doontaa xalka waxayna saameyn doontaa natiijooyinka cabbirka. Sidaa darteed, ka dib marka rotor la geliyo xalka, waa in loo oggolaadaa inay istaagto 5 min ka hor inta aan la tijaabin.
Waqtiga boostada: Febraayo-24-2023