Dhacdada hoos u dhaca viscosity inta lagu jiro kaydinta rinjiga waa dhibaato caadi ah, gaar ahaan ka dib kaydinta muddada dheer, viscosity of rinjiga ayaa si weyn hoos ugu dhacda, taasoo saameysa waxqabadka dhismaha iyo tayada badeecada. Hoos u dhaca viscosity waxay la xiriirtaa arrimo badan, sida heerkulka, qoyaanka, lisidda dareeraha, burburka polymer-ka, iwm., laakiin isdhexgalka cellulose ether-ka dhumucda leh ayaa si gaar ah muhiim u ah.
1. Doorka aasaasiga ah ee ether-ka cellulose
Cellulose ether waa dhumuc-dheg badan oo si weyn loogu isticmaalo rinjiyada biyaha ku salaysan. Shaqooyinkooda ugu muhiimsan waxaa ka mid ah:
Saamaynta dhumucda: Cellulose ether waxay samayn kartaa qaab-dhismeed shabakad saddex-geesood ah oo bararsan iyadoo nuugaysa biyaha, taasoo kordhinaysa daxalka nidaamka iyo hagaajinta thixotropy iyo waxqabadka dhismaha ee rinjiga.
Saamaynta xasilinta joojinta: Cellulose ether waxay si wax ku ool ah uga hortagi kartaa kala-goynta walxaha adag sida midabada iyo buuxinta rinjiga waxayna ilaalin kartaa isku-dhafka rinjiga.
Astaamaha sameynta filimada: Cellulose ether waxay sidoo kale saameyn kartaa hantida sameynta filimada ee rinjiga, taasoo ka dhigaysa dahaarka mid leh adkeysi iyo cimri dherer gaar ah.
Waxaa jira noocyo badan oo ah ether-yada cellulose, oo ay ku jiraan methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC), iwm. Agabkani waxay leeyihiin milmi kala duwan, awood dhumuc iyo iska caabin kaydin oo ku jirta dahaarka.
2. Sababaha ugu waaweyn ee hoos u dhaca dheellitirka jirka
Inta lagu jiro kaydinta dahaarka, hoos u dhaca viscosity waxaa inta badan sababa sababaha soo socda:
(1) Burburka ether-ka cellulose
Saamaynta dhumucda ee ether-yada cellulose ee dahaarka waxay ku xiran tahay cabbirka miisaankooda molecular iyo hufnaanta qaab-dhismeedkooda molecular. Inta lagu jiro kaydinta, arrimo ay ka mid yihiin heerkulka, aashitada iyo alkalinity, iyo noolaha yaryar ayaa sababi kara burburka ether-yada cellulose. Tusaale ahaan, inta lagu jiro kaydinta muddada dheer, qaybaha aashitada ama alkaline ee dahaarka ayaa laga yaabaa inay hydrolyzes ku sameeyaan silsiladda molecular-ka ee cellulose ether, yareeyaan miisaankooda molecular-ka, sidaas darteedna ay daciifiyaan saameyntooda dhumucda, taasoo keenta hoos u dhac ku yimaada viscosity-ga.
(2) Kala-baxa dareeraha iyo guuritaanka qoyaanka
Kala-baxa dareeraha ama socodka qoyaanka ee dahaarka ayaa saameyn kara xaaladda milmida ee ether-ka cellulose. Inta lagu jiro kaydinta, qayb ka mid ah biyuhu way uumi bixi karaan ama waxay u guuri karaan dusha sare ee dahaarka, taasoo ka dhigaysa qaybinta biyaha ee dahaarka mid aan sinnayn, taasoo saameynaysa heerka bararka ee ether-ka cellulose waxayna keenaysaa hoos u dhac ku yimaada dhesmaha meelaha deegaanka.
(3) Weerar yar yar
Kobaca microbial-ka ayaa laga yaabaa inuu ku dhaco dahaarka marka si khaldan loo kaydiyo ama ilaaliyayaashu ay noqdaan kuwo aan waxtar lahayn. Noolaha yaryar waxay burburin karaan ether-ka cellulose iyo kuwa kale ee dhumuc weyn ee dabiiciga ah, taasoo wiiqaysa saameyntooda dhumuc weyn waxayna sababi kartaa in dahaarka dahaarka uu yaraado. Dahaarka biyaha ku salaysan, gaar ahaan, waa deegaan wanaagsan oo loogu talagalay koritaanka microbial-ka sababtoo ah waxay ka kooban yihiin biyo badan.
(4) Gabow heerkul sare leh
Xaaladaha kaydinta heerkulka sare, qaab-dhismeedka jireed ama kiimiko ee silsiladda molecular ether cellulose ayaa isbeddeli kara. Tusaale ahaan, cellulose ethers waxay u nugul yihiin oksaydheynta ama pyrolysis heerkulka sare, taasoo keenta daciifinta saameynta dhumucda. Heerkulka sare wuxuu sidoo kale dedejiyaa kala-baxa dareeraha iyo uumiga biyaha, taasoo sii saamaysa xasilloonida viscosity.
3. Hababka lagu hagaajin karo xasilloonida kaydinta dahaarka
Si loo yareeyo hoos u dhaca dahaarka inta lagu jiro kaydinta loona kordhiyo cimriga kaydinta dahaarka, tallaabooyinka soo socda ayaa la qaadi karaa:
(1) Xulashada ether-ka cellulose-ka saxda ah
Noocyada kala duwan ee ether-ka cellulose waxay leeyihiin waxqabadyo kala duwan marka loo eego xasilloonida kaydinta. Ether-ka cellulose-ka leh miisaanka molecular-ka sare guud ahaan waxay leeyihiin saameyn dhumuc wanaagsan, laakiin xasilloonidooda kaydinta waa mid liidata, halka ether-ka cellulose-ka leh miisaanka molecular-ka hooseeya ay yeelan karaan waxqabad kaydin oo ka wanaagsan. Sidaa darteed, marka la naqshadaynayo qaacidada, ether-ka cellulose-ka leh xasilloonida kaydinta wanaagsan waa in la doortaa, ama ether-ka cellulose-ka waa in lagu daraa dhumucyo kale si loo hagaajiyo iska caabinta kaydinta.
(2) Xakamee pH-ga dahaarka
Aashitada iyo alkalinity-ga nidaamka dahaarka ayaa saameyn muhiim ah ku leh xasilloonida ether-ka cellulose. Naqshadeynta qaabaynta, qiimaha pH-ga ee dahaarka waa in la xakameeyaa si looga fogaado jawi aashito ama alkaline ah oo aad u daran si loo yareeyo burburka ether-ka cellulose. Isla mar ahaantaana, ku darista xaddi ku habboon oo ah hagaajiyaha pH ama kaydka ayaa gacan ka geysan kara xasilinta pH-ga nidaamka.
(3) Kordhinta isticmaalka waxyaabaha ilaaliya
Si looga hortago nabaad-guurka microbial-ka, waa in lagu daraa xaddi ku habboon oo ilaaliyayaal ah dahaarka. Waxyaabaha ilaaliyayaashu waxay joojin karaan koritaanka microbial-ka, taasoo ka hortagaysa in walxaha dabiiciga ah sida cellulose ether ay qudhmaan oo ay ilaaliyaan xasilloonida dahaarka. Waa in la doortaa ilaaliyayaal ku habboon iyadoo loo eegayo qaab-dhismeedka dahaarka iyo deegaanka kaydinta, waana in si joogto ah loo hubiyaa waxtarkooda.
(4) Xakamee jawiga kaydinta
Heerkulka kaydinta iyo qoyaanka dahaarka ayaa saameyn toos ah ku leh xasilloonida viscosity-ga. Dahaarka waa in lagu kaydiyaa jawi qalalan oo qabow, iyadoo laga fogaanayo heerkulka sare iyo xaaladaha qoyaanka sare si loo yareeyo dheellitirka dareeraha iyo burburka cellulose ether. Intaa waxaa dheer, baakadaha si fiican loo xiray waxay si wax ku ool ah u yareyn karaan socdaalka iyo uumiga biyaha waxayna dib u dhigi karaan hoos u dhaca viscosity-ga.
4. Arrimaha kale ee saameeya dheellitirka
Marka laga soo tago ether-yada cellulose, qaybaha kale ee nidaamka dahaarka ayaa sidoo kale saameyn kara isbeddelka ku yimaada viscosity-ga. Tusaale ahaan, nooca iyo fiirsashada midabada, heerka volatilisation-ka ee dareerayaasha, iyo iswaafajinta dhumuc-dhejiyeyaasha kale ama kala-firdhiyeyaasha ayaa saameyn kara xasilloonida viscosity-ga ee dahaarka. Sidaa darteed, naqshadeynta guud ee qaacidada dahaarka iyo isdhexgalka qaybaha ayaa sidoo kale ah qodobo muhiim ah oo u baahan in fiiro gaar ah la siiyo.
Hoos u dhaca ku dhaca dahaarka inta lagu jiro kaydinta dahaarka waxay si dhow ula xiriirtaa arrimo ay ka mid yihiin burburka ether-ka cellulose, kala-baxa dareeraha, iyo socdaalka biyaha. Si loo hagaajiyo xasilloonida kaydinta dahaarka, waa in la doortaa noocyada ether-ka cellulose ee ku habboon, pH-ga dahaarka waa in la xakameeyaa, cabbiraadaha ka hortagga daxalka waa in la xoojiyaa, deegaanka kaydintana waa in la hagaajiyaa. Iyada oo loo marayo naqshadaynta qaacidada macquulka ah iyo maaraynta kaydinta wanaagsan, dhibaatada hoos u dhaca dahaarka inta lagu jiro kaydinta dahaarka si wax ku ool ah ayaa loo dhimi karaa, waxqabadka badeecada iyo tartanka suuqana waa la horumarin karaa.
Waqtiga boostada: Sebteembar-27-2024