Cellulose waa polysaccharide kaas oo sameeya noocyo kala duwan oo ethers ah oo biyaha ku milma. Cufnaanta Cellulose waa polymers aan biyo ku milmin oo aan ionic ahayn. Taariikhdeeda isticmaalkeedu aad bay u dheer tahay, in ka badan 30 sano, waxaana jira noocyo badan. Wali waxaa loo isticmaalaa ku dhawaad dhammaan rinjiyada latex waana kuwa ugu muhiimsan ee dhumuc-dhejiyeyaasha. Cufnaanta Cellulosic aad bay waxtar ugu leedahay nidaamyada biyaha sababtoo ah waxay qariyaan biyaha laftooda. Warshadaha rinjiga, dhumucyada cellulose ee ugu badan ee la isticmaalo waa:methyl cellulose (MC), cellulose hydroxyethyl (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC),cellulose hydroxypropyl methyl (HPMC)iyo hydroxyethyl cellulose oo si hydrophobic ah wax looga beddelay (HMHEC). HEC waa polysaccharide biyo-milmi kara oo si weyn loogu isticmaalo dhumucda rinjiyada latex-ka ee qaab-dhismeedka matt iyo nus-dhalaalaya. Qarjiyeyaashu waxay ku diyaar yihiin heerar kala duwan oo dheellitirnaan ah, qarjiyeyaashuna waxay leeyihiin iswaafajin midab iyo xasillooni kaydin oo aad u fiican.
Sifooyinka siman, ka hortagga-furfurka, sameynta filimka iyo ka hortagga-dhoojinta ee filimka dahaadhka waxay ku xiran yihiin miisaanka molecular ee qaraabada ahHEC. HEC iyo polymers-ka kale ee aan la xiriirin biyaha ku milma waxay qariyaan wejiga biyaha ee dahaarka. 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 miisaan molecular oo hooseeya 2% xal biyood oo leh viscosity qiyaastii 10 mPs ilaa viscosity miisaan molecular oo sarreeya oo ah 100 000 mPs. Darajooyinka miisaanka molecular ee hooseeya waxaa badanaa loo isticmaalaa sidii colloids ilaalin ah oo ku jira polymerization-ka emulsion rinjiga latex, darajooyinka ugu badan ee la isticmaalo (viscosity 4 800–50 000 mP·s) waxaa loo isticmaalaa dhumuc-yaqaanno. Habka noocan ah ee dhumuc-yaqaanka waxaa sabab u ah fuuq-baxa sare ee xidhmooyinka hydrogen iyo isku-xidhka u dhexeeya silsiladaha 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 aad u weyn oo molecular ah. 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 copolymer-ka vinyl acetate wuxuuna leeyahay sifooyin la mid ah kuwa kale ee dhumucda isku xidhka, laakiin leh qaacidooyin fudud.
Waqtiga boostada: Abriil-25-2024