Hydroxyethylcellulose (HEC) waa polymer aan-ionic biyo-milmi leh oo si ballaaran loogu isticmaalo daaha, qurxinta, qalabka dhismaha, daawada iyo warshadaha kale. Shaqadeeda ugu weyni waa sida dhumuc weyn, wakiilka joojinta, wakiilka filim-samaynta iyo xasilinta, taas oo si weyn u hagaajin karta sifooyinka rheological ee alaabta. HEC waxay leedahay milmayn wanaagsan, dhumucdiisuna, samaynta filimada iyo iswaafajinta, sidaa darteed waxaa loo door bidaa meelo badan. Si kastaba ha noqotee, ee ku saabsan xasilloonida HEC iyo waxqabadkeeda deegaannada pH ee kala duwan, waa arrin muhiim ah oo ay tahay in lagu tixgeliyo codsiyada la taaban karo.
Marka la eego dareenka pH, hydroxyethylcellulose, oo ah polymer-ka aan-ionic ahayn, ayaa si dabiici ah uga nugul isbeddellada pH. Tani way ka duwan tahay qaar ka mid ah dhumucyada kale ee ionic (sida karboxymethylcellulose ama polymers acrylic gaar ah), kuwaas oo ka kooban kooxaha ionic ee qaab-dhismeedka molecular oo u nugul kala-baxa ama ionization ee jawi acidic ama alkaline. , sidaas darteed saameynaya saameynta dhumucda iyo sifooyinka rheological ee xalka. Sababtoo ah HEC kuma jirto wax lacag ah, saameynteeda dhumucdeeda iyo sifaheeda milanka ayaa weli ah kuwo xasiloon marka loo eego baaxadda pH ballaaran (sida caadiga ah pH 3 ilaa pH 11). Habkani waxa uu awood u siinayaa HEC in ay la qabsato noocyo kala duwan oo hababka qaabaynta iyo samayn kartaa saamayn dhumuc wanaagsan hoos xaaladaha acidic, dhexdhexaad ah ama daciif ah alkaline.
Inkasta oo HEC ay ku leedahay xasillooni wanaagsan marka la eego xaaladaha pH intooda badan, waxqabadkeeda waxaa laga yaabaa inay saameyn ku yeelato bey'ada pH ee aadka u daran, sida deegaan aad u acidic ama alkaline ah. Tusaale ahaan, marka la eego xaaladaha acidic aadka ah (pH <3), milanka HEC waa la dhimi karaa saamaynta dhumucduna ma noqon karto mid la mid ah sida meelaha dhexdhexaadka ah ama waxoogaa acidic ah. Tani waa sababta oo ah xoojinta ion hydrogen-ka xad-dhaafka ah waxay saameyn doontaa is-waafajinta silsiladda molecular HEC, taasoo yareyneysa awoodda ay u leedahay inay ku faafiso oo ku bararto biyaha. Sidoo kale, marka la eego xaaladaha alkaline-ka ah (pH> 11), HEC waxaa laga yaabaa inay gasho qayb ahaan hoos u dhac ama wax ka beddel kiimikaad, oo saameynaysa saameynteeda dhumucdeeda.
Marka lagu daro milanka iyo saamaynta dhumucda, pH waxa kale oo laga yaabaa inay saamayso iswaafajinta HEC iyo qaybaha kale ee qaabaynta. Marka la eego degaannada pH ee kala duwan, maaddooyinka firfircoon qaarkood ayaa laga yaabaa inay ionize ama kala go'aan, si ay u beddelaan isdhexgalka HEC. Tusaale ahaan, xaaladaha aashitada, qaar ka mid ah ion birta ama maaddooyinka firfircoon ee cationic ayaa laga yaabaa inay sameeyaan iskudhafyo leh HEC, taasoo keenaysa in saameynteeda dhumucdu ay daciifto ama ay soo degdegto. Sidaa darteed, qaabeynta qaabeynta, isdhexgalka ka dhexeeya HEC iyo maaddooyinka kale ee hoos yimaada xaaladaha pH ee kala duwan ayaa loo baahan yahay in la tixgeliyo si loo hubiyo xasilloonida iyo shaqeynta nidaamka oo dhan.
In kasta oo HEC lafteedu ay aad uga nugul tahay isbeddellada pH, heerka kala diriddeeda iyo habka kala diriddu waxa laga yaabaa inay saamayso pH. HEC waxay caadi ahaan si dhakhso ah ugu milmi kartaa xaaladaha dhexdhexaadka ah ama waxoogaa aashito ah, halka xaaladaha aadka u acidic ah ama alkalineka ah ay habka kala diridu uu noqon karo mid gaabis ah. Sidaa darteed, marka la diyaarinayo xalalka, waxaa inta badan lagu talinayaa in marka hore lagu daro HEC si dhexdhexaad ah ama dhexdhexaad ah xal aqueous ah si loo hubiyo in ay si degdeg ah iyo si siman u milmaan.
Hydroxyethylcellulose (HEC), oo ah polymer-ka aan-ionic ahayn, aad ugu nugul pH wuxuuna ilaalin karaa saamaynta dhumucdiisuna waxay deggan tahay iyo sifooyinka milanka ee kala duwan pH ballaaran. Waxqabadkeedu waa xasiloon inta u dhaxaysa pH 3 ilaa pH 11, laakiin aashitada xad dhaafka ah iyo deegaanka alkali, saamaynta dhumucdeeda iyo milanka ayaa laga yaabaa inay saamayso. Sidaa darteed, marka la codsanayo HEC, inkasta oo inta badan kiisaska aan loo baahnayn in fiiro gaar ah loo yeesho isbeddellada pH, xaaladaha ba'an, tijaabinta ku habboon iyo hagaajinta ayaa weli loo baahan yahay si loo hubiyo xasilloonida iyo shaqeynta nidaamka.
Waqtiga boostada: Oct-22-2024