Kooxaha hydroxyl ayaa saaranether cellulosemolecules iyo atomiyada oksijiinta ee ku yaala curaarta ether-ka waxay samayn doonaan curaarta hydrogen oo leh molecules biyaha, iyagoo u beddelaya biyaha bilaashka ah biyo xidhxidhan, sidaas darteed waxay door wanaagsan ka ciyaaraan ilaalinta biyaha; faafinta wadajirka ah ee u dhexeeya molecules biyaha iyo cellulose ether silsiladaha molecular waxay u ogolaataa molecules biyaha inay galaan gudaha silsiladda macromolecular cellulose ether oo ay ku xiran yihiin caqabado xooggan, sidaas darteed samaynta biyo bilaash ah iyo biyo isku xiran, taas oo hagaajinaysa haynta biyaha ee cement slurry; ether cellulose waxay wanaajisaa guryaha rheological, qaab-dhismeedka shabakada daloolsan iyo cadaadiska osmotic ee dareeraha sibidhka cusub ama sifooyinka filim-samaynta ee ether cellulose ayaa xannibaya fidinta biyaha.
Haysashada biyaha ee etherka cellulose lafteedu waxay ka timaadaa milanka iyo fuuq-baxa etherka cellulose laftiisa. Awoodda fuuq-celinta ee kooxaha hydroxyl oo keliya kuma filna inay bixiso kharashka xooggan ee hydrogen bonds iyo xoogagga van der Waals ee u dhexeeya molecules, sidaas darteed kaliya way bararaan laakiin kuma milmaan biyaha. Marka bedelaadaha lagu soo bandhigo silsiladda molecular, ma aha oo kaliya in beddelayaashu ay burburiyaan silsiladaha hydrogen, laakiin sidoo kale isku-xidhka isku-xidhka hydrogen-ka ayaa la burburiyaa sababtoo ah jeexjeexyada beddelka ee u dhexeeya silsiladaha ku xiga. Badeecooyinka beddelka ah ee weyn, ayaa sii weynaan doonta masaafada u dhexeysa molecules, iyo saameynta weyn ee burburinta curaarta hydrogen. Ka dib marka lakabka cellulose uu bararo, xalku wuu soo galayaa, ether-ka cellulose wuxuu noqdaa mid biyo-milmi leh, samaynta xal sare oo viscosity ah, ka dibna door ka ciyaara ilaalinta biyaha.
Qodobbada saameeya waxqabadka xajinta biyaha:
Viscosity: Way sii weyn tahay viscosity ee ether cellulose, si fiican u haynta biyaha, laakiin heerka sare ee viscosity, sarreeya miisaanka qaraabo ee ether cellulose, iyo milmaheedu hoos u dhaco si waafaqsan, taas oo saameyn xun ku leh xoojinta iyo waxqabadka dhismaha. ee hoobiye. Guud ahaan, isla badeecada, natiijooyinka viscosity ee lagu cabbiro habab kala duwan aad bay u kala duwan yihiin, marka marka la barbardhigo viscosity, waa in la sameeyaa inta u dhaxaysa hababka tijaabada ah (oo ay ku jiraan heerkulka, rotor, iwm.).
Qadarka isku-darka: Inta badan xaddiga ether-ka cellulose ee lagu daray hoobiye, ayaa ka sii fiicnaanaya waxqabadka xajinta biyaha. Caadi ahaan, qadar yar oo ah ether cellulose ayaa si weyn u wanaajin kara heerka haynta biyaha ee hoobiye. Marka qaddarku gaadho heer gaar ah, isbeddelka korodhka xadiga biyaha ayaa hoos u dhacaya.
Ganaaxida qayb ka mid ah: Qaybaha ka sii roon, ayaa sii wanagsan sii haynta biyaha. Marka qaybo waaweyn oo ether cellulose ah ay la kulmaan biyaha, dusha sare isla markiiba wuu milmaa oo sameeyaa jel si loogu duubo walxaha si looga hortago in unugyada biyuhu ay sii wadaan inay galaan. Mararka qaarkood, xitaa walaaqaya muddada-dheer ma gaari karo kala firidhsan isku mid ah iyo kala dirid, samaynta xal flocculent turbid ama agglomeration, kaas oo si weyn u saameeya haynta biyaha ee ether cellulose. Solubility waa mid ka mid ah arrimaha doorashada ether cellulose. Wanaajinta sidoo kale waa tilmaame hawleed muhiim ah oo ah ether methyl cellulose. Wanaajinta waxay saamaysaa milanka ether methyl cellulose. Coarser MC badanaa waa granular waxaana si fudud loogu milmi karaa biyaha iyada oo aan la kicin, laakiin heerka kala diriddu aad buu u gaabiyaa oo kuma habboona in loo isticmaalo hoobiye engegan.
Heerkulka: Marka heerkulka deegaanku kor u kaco, haynta biyaha ee ethers cellulose sida caadiga ah hoos ayey u dhacdaa, laakiin qaar ka mid ah ethers cellulose-ka wax laga beddelay ayaa sidoo kale leh biyo-hayn wanaagsan oo hoos yimaada xaaladaha heerkulka sare; marka heerkulku kor u kaco, fuuq-baxa polymers-ka ayaa daciifa, biyaha u dhexeeya silsiladaha ayaa la soo saaraa. Marka fuuq-baxu ku filan yahay, molecules-yadu waxay bilaabaan inay isugeeyaan si ay u sameeyaan jel qaab-dhismeedka shabakad saddex-geesood ah.
Qaab-dhismeedka molecular: Ether-ka Cellulose leh beddelaad hoose ayaa leh biyo-hayn fiican.
Dhumucda iyo thixotropy
Dhumayn:
Saamaynta awoodda isku-xidhka iyo waxqabadka ka-hortagga-soo-baxa: Cellulose ethers waxay siinayaan hoobiye qoyan viscosity aad u fiican, taas oo si weyn u kordhin karta awoodda isku-xidhka ee hoobiye qoyan oo leh lakabka saldhigga iyo hagaajinta waxqabadka anti-sagging ee hoobiye. Waxaa si weyn loo isticmaalaa in lagu dhejiyo hoobiye, tile bonding hoobiye iyo nidaamka dahaarka derbiga dibadda 3.
Saamaynta isku midka ahaanshaha walxaha: Saamaynta dhumucda ethers cellulose waxay sidoo kale kordhin kartaa awoodda ka-hortagga kala-firdhinta iyo isku-dhafka walxaha cusub ee isku dhafan, waxay ka hortagtaa kala-soocidda walxaha, kala-soocidda iyo jeexista biyaha, waxaana loo isticmaali karaa shubka fiber-ka, shubka biyaha hoostooda iyo shubka is-xakamaynta .
Isha iyo saameynta dhumucda: Saamaynta dhumucda ether-ka cellulose ee alaabta cement-ku salaysan waxay ka timaadaa viscosity ee xal ether cellulose. Xaalado isku mid ah, heerka sare ee viscosity ee ether cellulose, ayaa si fiican u nuugaya walxaha sibidhka ku salaysan ee wax laga beddelay, laakiin haddii maqaarku aad u sarreeyo, waxay saameyn doontaa dareeraha iyo shaqeynta walxaha (sida ku dhejinta mindida dhejiska. ). Hoobiye-is-miidaaminta iyo shubka is-xakamaynta leh ee shuruudaha dareeraha sarreeya waxay u baahan yihiin mawjad aad u hooseeya ee etherka cellulose. Intaa waxaa dheer, saameynta dhumucda ether-ka cellulose waxay sidoo kale kordhin doontaa baahida biyaha ee walxaha ku salaysan sibidhka waxayna kordhisaa wax soo saarka hoobiye.
Thixotropy:
Xalka aqueous cellulose ether viscosity sare leh thixotropy sare, taas oo sidoo kale waa sifo weyn ee ether cellulose. Xalka aqueous ee methyl cellulose caadi ahaan waxa uu leeyahay pseudoplasticity iyo dheecaan aan thixotropic ka hooseeya heerkulkiisa jel, laakiin wuxuu muujinayaa sifooyinka socodka Newtonian ee heerarka dhogorta hoose. Pseudoplasticity waxay kordhisaa kororka miisaanka unugga unugga cellulose ether, oo aan wax shaqo ah ku lahayn nooca beddelka iyo heerka beddelka. Sidaa darteed, ethers cellulose ee darajada viscosity la mid ah, ha ahaadeen MC, HPMC, ama HEMC, had iyo jeer waxay muujiyaan sifooyinka rheological isku mid ah ilaa inta diirada iyo heerkulku ay yihiin kuwo joogto ah. Marka heerkulku kor u kaco, jel qaabdhismeed ayaa la sameeyaa, waxaana dhacda qulqulka thixotropic sare. Ethers Cellulose oo leh feejignaan sare iyo viscosity hoose ayaa muujinaya thixotropy xitaa ka hooseeya heerkulka jelka. Hantidan aad bay faa'iido ugu leedahay hagaajinta simida iyo hoos u dhigida hoobiyeyaasha dhismaha inta lagu jiro dhismaha.
Entrainment hawada
Mabda'a iyo saamaynta waxqabadka shaqada: Cellulose ether waxay leedahay saameyn weyn oo hawo kicinta walxaha cusub ee sibidhka ku salaysan. Ether Cellulose waxay leedahay labada kooxood ee hydrophilic (kooxaha hydroxyl, kooxaha ether) iyo kooxaha hydrophobic (kooxaha methyl, giraannada gulukooska). Waa surfactant leh dhaqdhaqaaqa dusha sare, sidaas darteed saameyn ku yeelashada hawada. Saamaynta hawo-mareenka hawada waxay soo saari doontaa saameyn kubbadda, taas oo hagaajin karta waxqabadka shaqada ee walxaha cusub ee isku dhafan, sida kordhinta caagagga iyo jilicsanaanta hoobiye inta lagu jiro hawlgalka, taas oo faa'iido u leh faafinta hoobiye; waxa kale oo ay kordhin doontaa wax soo saarka hoobiyeyaasha iyo dhimista kharashka wax soo saarka hoobiye.
Saamaynta sifooyinka farsamada: Saamaynta hawo-mareenka waxay kordhin doontaa porosity ee walxaha adag waxayna hoos u dhigi doontaa sifooyinka farsamada sida xoogga iyo moodooyinka laastikada.
Saamaynta dareeraha: Sida surfactant ah, ether cellulose sidoo kale waxay leedahay saameyn qoynta ama saliidaynta qaybaha sibidhka, taas oo ay weheliso saamaynta hawadu waxay kordhisaa dareeraha walxaha ku salaysan sibidhka, laakiin saameynteeda dhumucdeedu waxay yaraynaysaa dareeraha. Saamaynta ether-ka cellulose ee dareeraha alaabta sibidhka ku salaysan waa isku-dhafka balaastiigga iyo saamaynta dhumucda. Guud ahaan, marka qiyaasta ether-ka cellulose ay aad u hooseyso, waxay inta badan u muuqataa sida balaastiigga ama saamaynta yaraynta biyaha; marka qiyaastu sarreyso, saameynta dhumucda ether-ka cellulose ayaa si degdeg ah u kordheysa, saameynteeda hawo-gelinta hawadu waxay u egtahay in ay buuxsanto, sidaas darteed waxay u muuqataa inay sii korodho ama kordhinayso baahida biyaha.
Waqtiga boostada: Dec-23-2024