Cellulose waa polysaccharide oo sameysa noocyo kala duwan oo ethers ah oo biyaha ku milma. Cufnaanta cellulose waa polymers-yo aan biyo lahayn oo aan ionic ahayn. Taariikhdeeda isticmaalkeedu waa mid aad u dheer, in ka badan 30 sano, waxaana jira noocyo badan. Wali waxaa loo isticmaalaa ku dhawaad dhammaan rinjiyada latex waana kuwa ugu muhiimsan ee dhumuc-sameeyayaasha. Cufnaanta cellulosic-ga ayaa aad waxtar ugu leh nidaamyada biyaha sababtoo ah waxay qariyaan biyaha laftooda. Warshadaha rinjiga, dhumuc-sameeyayaasha cellulose-ka ee ugu badan ee la isticmaalo waa: methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) iyo hydrophobically modified hydroxyethyl cellulose (HMHEC). HEC waa polysaccharide biyo ku milma oo si weyn loogu isticmaalo dhumucda rinjiyada latex-ka ee qaab dhismeedka matt iyo nus-dhalaal ah. Qalaf-sameeyayaasha waxaa laga heli karaa darajooyin kala duwan oo viscosity ah, dhumuc-sameeyayaasha leh cellulose-kan waxay leeyihiin iswaafajin midab oo aad u fiican iyo xasillooni kaydin.
Sifooyinka heerka, ka hortagga-furmidda, sameynta filimka iyo ka hortagga-burburinta ee filimka dahaadhka waxay ku xiran yihiin miisaanka molecular ee qaraabada ah ee HEC. HEC iyo polymers-ka kale ee aan la xiriirin biyaha-milmi kara waxay qariyaan wejiga biyaha ee dahaadhka. Dhumuceeyayaasha Cellulose waxaa loo isticmaali karaa kaligood ama iyadoo lala kaashanayo dhumuc-yaqaanno kale si loo helo rheology gaar ah. Ethers-ka Cellulose waxay yeelan karaan miisaanno molecular oo kala duwan iyo darajooyin viscosity oo kala duwan, laga bilaabo xal biyood oo miisaan molecular oo hooseeya 2% oo leh viscosity qiyaastii 10 MPS ilaa viscosity miisaan molecular oo sarreeya oo ah 100 000 MP.S. Darajooyinka miisaanka molecular ee hooseeya waxaa badanaa loo isticmaalaa sidii colloids ilaalin ah oo ku jira polymerization-ka rinjiga latex, iyo darajooyinka ugu badan (viscosity 4 800–50 000 MP·S) waxaa loo isticmaalaa sidii dhumuc-yaqaanno. Habka noocan ah ee dhumuc-yaqaanka waxaa sabab u ah fuuq-baxa sare ee xidhmooyinka hydrogen iyo isku-xidhka silsiladihiisa molecular.
Cellulose-ka dhaqameedku waa polymer miisaankiisu sareeyo oo inta badan qaro weyn oo inta badan ku dhex milma silsiladaha molecular-ka. Sababtoo ah viscosity-ga sare ee heerka xiirashada hooseeya, hantida simanku waa liidataa, waxayna saameysaa dhalaalka filimka dahaadhka. Heerka xiirashada sare, viscosity-gu wuu hooseeyaa, iska caabinta rushaynta filimka dahaadhka waa mid liidata, buuxinta filimka dahaadhkana ma fiicna. Astaamaha isticmaalka ee HEC, sida iska caabinta burushka, duubista iyo rushaynta duubista, waxay si toos ah ula xiriiraan doorashada dhumuc-dhejinta. Sidoo kale sifooyinka socodka sida heerka iyo iska caabinta slag waxaa inta badan saameeya dhumuc-dhejinta.
Cellulose-ka Hydrophobically modified (HMHEC) waa dhumuc-qafiif cellulose ah oo leh wax-ka-beddel hydrophobic ah oo ku yaal silsilado laamood ah (dhowr kooxood oo silsilad dheer ah oo alkyl ah ayaa lagu soo bandhigayaa silsiladda ugu weyn ee qaab-dhismeedka). Dahaarkani wuxuu leeyahay dheellitir sare oo heer sare ah oo xiirashada ah sidaas darteedna wuxuu leeyahay qaab-dhismeed filim oo wanaagsan. Sida Natrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Saamayntiisa dhumuc-qafiifka waxay la mid tahay tan dhumuc-qafiifiyeyaasha ether cellulose oo leh cuf molecular oo aad u weyn. Waxay hagaajisaa dheellitirka iyo heerka ICI, waxayna yareysaa xiisadda dusha sare. Tusaale ahaan, xiisadda dusha sare ee HEC waa qiyaastii 67 MN/m, xiisadda dusha sare ee HMHEC waa 55~65 MN/m.
HMHEC waxay leedahay buufin aad u fiican, ka hortagta jabka, sifooyinka siman, dhalaal wanaagsan iyo ka hortagga midabka. Si ballaaran ayaa loo isticmaalaa mana laha saameyn xun oo ku saabsan sameynta filimka rinjiyada latex ee cabbirka yar. Waxqabadka wanaagsan ee sameynta filimka iyo waxqabadka ka hortagga daxalka. Dhejiskan gaarka ah ee isku xidhka ayaa si fiican ugu shaqeeya nidaamyada vinyl acetate copolymer, waxqabadkiisuna wuxuu la mid yahay kuwa kale ee isku xidhka dhumucda, laakiin leh qaacidooyin fudud.
Waqtiga boostada: Maarso-16-2023