Hydroxypropyl methyl cellulose HPMC, oo sidoo kale loo yaqaan hydroxypromellose, waa budada ether cellulose cad ilaa caddaan ah ama granule oo leh milmi biyo qabow iyo biyo kulul oo aan milmi karin oo la mid ah methyl cellulose. Kooxda Hydroxypropyl iyo kooxda methyl waa isku xidhka ether iyo giraanta gulukooska aan biyo lahayn ee cellulose oo la isku daray, waa nooc ka mid ah ether isku dhafan oo aan ionic ahayn. Waa polymer semi-synthetic ah, aan firfircoonayn, viscoelastic ah oo badanaa loo isticmaalo saliid ahaan daaweynta indhaha, ama sida kaabiye ama kaabiye daawooyinka afka laga qaato.
1. Habka wax soo saarka
Saxarada Kraft oo leh αcellulose oo ah 97%, isku-dhafnaan gudaha ah oo ah 720mL /g iyo dhererka fiber-ka ee celceliska 2.6mm ayaa lagu qooyay 49% xal NaOH ah 40℃ muddo 50 ilbiriqsi ah. Kadib saxarka ayaa la soo saaray si looga saaro xalka NaOH ee xad-dhaafka ah ee 49% si loo helo cellulose alkali. Saamiga miisaanka ee (49% xal biyood NaOH ah) ilaa (qayb adag oo saxarka ah) tallaabada lagu shubayo waxay ahayd 200. Saamiga miisaanka NaOH ee cellulose alkali ah ilaa adag ee saxarka waa 1.49. Cellulose alkali ah oo sidaas lagu helay (20kg) waxaa la dhigayaa fal-gale cadaadis jacked ah oo leh kacsanaan gudaha ah, ka dibna faakiyuum lagu shubo oo lagu nadiifiyo nitrogen si si ku filan looga saaro oksijiinta fal-galeyaasha. Kadib, heerkulka fal-galeyaasha waxaa lagu xakameeyay 60℃ halka walaaqidda gudaha la sameeyay.
Kadib 2.4kg dME ayaa lagu daray, heerkulka fal-galkana waxaa la xakameeyay 60℃. Kadib markii lagu daray dimethyl ether, waxaa lagu daray methylene chloride si loo sameeyo saamiga molar ee methylene chloride iyo NaOH ee alkaline cellulose 1.3, propylene oxide ayaa lagu daray si loo sameeyo saamiga miisaanka ee propylene oxide ilaa adag ee saxarka 1.97, heerkulka fal-galkana waxaa la xakameeyay 60℃ ilaa 80℃. Kadib markii lagu daray chloromethane iyo propylene oxide, heerkulka fal-galka waxaa la xakameeyay 80℃ ilaa 90℃. Intaa waxaa dheer, fal-galku wuxuu socday 20 daqiiqo 90℃.
Gaaska ayaa ka soo daadanaya fal-galka ka dibna cellulose-ka hydroxypropyl methyl ee cayriin ayaa laga saarayaa fal-galka. Heerkulka cellulose-ka hydroxypropyl methyl ee cayriin wuxuu ahaa 62℃. Cabbir wadarta guud ee 50% ee cabbirka walxaha ee ku jira qaybinta cabbirka walxaha ee ku salaysan miisaanka isku-darka iyadoo lagu saleynayo saamiga hydroxypropyl methyl cellulose cayriin iyada oo loo marayo furitaanka shanta sifeyn, mid walbana wuxuu leeyahay cabbir furitaan oo kala duwan.
Natiijo ahaan, celceliska cabbirka walxaha qallafsan wuxuu ahaa 6.2mm. Celceliska cabbirka walxaha qallafsan ee hydroxypropyl methyl cellulose-ka cayriin ee la helay waxaa lagu soo bandhigay cajiin biaxial ah oo joogto ah (KRC kneader S1, L/D = 10.2, mugga gudaha 0.12 L, xawaaraha wareegga 150rpm) xawaare dhan 10kg/saacaddii, waxaana la helay cellulose hydroxypropyl methyl cayriin ah oo qudhmay. Natiijo ahaan cabbiro isku mid ah iyadoo la isticmaalayo 5 shaashad oo leh cabbirro kala duwan oo furitaan ah, celceliska cabbirka walxaha wuxuu ahaa 1.4mm. Ku darista biyo kulul oo 80℃ ah cellulose hydroxypropyl methyl cayriin ah oo qudhmay oo ku jira taangiga iyadoo la xakameynayo heerkulka jaakadda. xaddiga saamiga miisaanka ee hydroxypropyl methyl cellulose cayriin ee qudhmay ee wadarta guud ee slurry-ka waa 0.1, slurry-na waa la helay. slurry-ka waxaa lagu walaaqay heerkul joogto ah oo ah 80℃ muddo 60 daqiiqo ah.
Dabadeed, dareeraha waxaa la siiyaa xawaaraha wareegga ah ee 0.5 RPM iyo shaandhada cadaadiska wareega ee horay loo kululeeyay (alaabada BHS Sonthofen). Heerkulka dareeraha waa 93℃. Isticmaal bamka si aad u keento dareeraha, cadaadiska sii deynta bamka waa 0.2mpa. Cabbirka furitaanka ee shaandhada cadaadiska wareega waa 80μm, aagga shaandhadana waa 0.12m2. Qalabka dareeraha ah ee la siiyo shaandhada cadaadiska wareega waxaa lagu sifeeyaa shaandhada waxaana loo beddelaa keega shaandhada. Keegga shaandhada ee ka dhasha waxaa la siiyaa uumi 0.3mpa ah iyo biyo kulul oo 95℃ ah oo leh saamiga miisaanka 10.0 ee qaybta adag ee HYDROXYpropyl methyl cellulose ee la dhaqay, kaas oo markaa lagu sifeeyo shaandho.
Biyaha kulul waxaa lagu shubaa bamka iyadoo cadaadiskiisu yahay 0.2mpa. Ka dib marka biyaha kulul la keeno, uumi 0.3mpa ah ayaa la bixiyaa. Ka dib marka alaabta la dhaqo waxaa laga saaraa dusha sare ee shaandhada iyadoo la adeegsanayo xoqe ka dibna laga saaro mashiinka dharka lagu dhaqo. Tallaabooyinka laga bilaabo bixinta dareeraha ilaa bixinta alaabta la dhaqo si joogto ah ayaa loo sameeyaa. Sida lagu cabbiray hygrometer kuleyl-qallajin ah, biyaha ku jira badeecada la dhaqay sidaas darteed ayaa la shubay waxay ahaayeen 52.8%. Alaabada la dhaqay ee laga saaray shaandhada cadaadiska wareega waxaa lagu qalajiyey qalajiye hawo ah 80℃, ka dibna lagu burburiyey warshadda Victory si loo helo hydroxypropyl methyl cellulose.
2. Codsiga
HPMCBadeecada waxaa loo isticmaalaa inay noqoto dhumuc, kala firdhiso, xidho, emulsifier iyo xasiliye warshadaha dharka. Sidoo kale si weyn ayaa loogu isticmaalaa resin synthetic, petrochemical, dhoobada, warqadda, maqaarka, daawada, cuntada, qurxinta iyo warshadaha kale.
Waqtiga boostada: Abriil-26-2024