Cellulose waa polysaccharide ka sameysa noocyo kala duwan oo ethers biyo-milmi leh.Dhumucyada Cellulose waa polymers-biyo-milmi leh oo aan ahayn.Isticmaalkeedu waa mid aad u dheer, in ka badan 30 sano, waxaana jira noocyo badan.Weli waxaa loo isticmaalaa ku dhawaad dhammaan rinjiyada cinjirka ah waana kuwa ugu badan ee dhumucyada.Dhumucyada Cellulosic aad bay waxtar ugu leeyihiin hababka aqueous sababtoo ah iyaga laftooda ayaa dhuuqaya biyaha.Warshadaha rinjiga, dhumucda cellulose-ka ugu badan ee la isticmaalo waa: methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) iyo hydroxypropyl methyl cellulose HMHEC).HEC waa polysaccharide biyo-milmi leh oo si ballaaran loogu isticmaalo dhumucda rinjiyada cinjirka ah ee matte iyo semi-gloss qaabdhismeedka.Dhumucdiisuna waxay ku jiraan darajooyin viscosity oo kala duwan iyo dhumucyada leh cellulose-kan ayaa leh midab aad u fiican iyo xasilloonida kaydinta.
Heerarka, ka-hortagga-firdhinta, samaynta filimada iyo sifooyinka ka-hortagga ee filimka daahan waxay ku xiran tahay miisaanka unugyada unugyada ee HEC.HEC iyo polymers-ka kale ee biyaha ku milma ee aan la xidhiidhin waxay adkeeyaan wejiga aqueous ee daahan.Dhumucyada cellulose waxaa loo isticmaali karaa kaligaa ama lagu daro dhumucyada kale si loo helo rheology gaar ah.Ether-yada Cellulose waxay yeelan karaan miisaanyo unugyo kala duwan oo qaraabo ah iyo darajooyin viscosity oo kala duwan, oo u dhexeeya miisaan kelli ah oo hooseeya 2% xal aqueous ah oo leh muuqasho qiyaastii 10 MPS ilaa cufnaanta culeeska molecular sare ee 100 000 MP.S.Darajooyinka miisaankoodu yar yahay waxaa badanaa loo isticmaalaa sida kolloysyada ilaalinta ee rinjiga emulsion polymerization, iyo darajooyinka ugu caansan (viscosity 4 800-50 000 MP·S) ayaa loo isticmaalaa sidii dhumucyo ahaan.Habka dhumucda noocaan ah waxaa sabab u ah fuuq-baxa sare ee curaarta hydrogen iyo isku dhafka u dhexeeya silsiladaha molecular.
Cellulose dhaqameedku waa polymer miisaan sare leh oo dhumuc weyna inta badan iyada oo loo marayo isku xidhka silsiladaha molecular.Sababo la xiriira viscosity sare ee heerka xiirid hoose, hantida siman waa liidata, oo waxay saamaysaa gloss ee filimka daahan.Heerarka sare ee dhogorta, viscosity waa hooseeyaa, caabbinta caabbinta ee filimka dahaarka ayaa liidata, iyo buuxinta filimka dahaarka ma fiicna.Astaamaha codsiga ee HEC, sida caabbinta burushka, filimaanta iyo spatter roller, waxay si toos ah ula xiriiraan doorashada dhumucda.Sidoo kale astaamaheeda socodka sida isbarbardhigga iyo iska caabbinta saggu waxay inta badan saameeyaan dhumucyada.
Hydrophobically modified cellulose (HMHEC) waa dhumuc cellulose ah kaas oo leh wax ka beddelka hydrophobic ee silsiladaha laamoodka ah qaarkood (dhowr kooxo silsilad alkyl ah ayaa lagu soo bandhigay silsiladda ugu weyn ee dhismaha).Dahaarkani waxa uu leeyahay viscosity sare ee heerarka xiirid sare oo sidaas darteed samaynta filim ka fiican.Sida Natrosol Plus Fasalka 330, 331, Cellosize SG-100, Bermocoll EHM-100.Saameynteeda dhumucdeedu waxay la mid tahay tan dhumucyada ether cellulose oo leh cuf molecular oo aad u weyn.Waxay hagaajinaysaa viscosity iyo heerka ICI, waxayna yaraynaysaa xiisadda dusha sare.Tusaale ahaan, culeyska dusha sare ee HEC wuxuu ku saabsan yahay 67 MN / m, iyo culeyska dusha sare ee HMHEC waa 55 ~ 65 MN / m.
HMHEC waxay leedahay buufin heer sare ah, ka-hortagga sagging, sifaynta guryaha, dhalaalid wanaagsan iyo caking-ka-hortagga midabka.Waxaa si weyn loo isticmaalaa oo aan wax saamayn taban ku leh samaynta filimka ee size qayb ganaax rinji cinjirka.Wax qabad wanaagsan oo samaynta filimada iyo waxqabadka ka-hortagga daxalka.Dhumucnafiyaha gaarka ah wuxuu si fiican ugu shaqeeyaa nidaamyada copolymer vinyl acetate, iyo waxqabadkiisu wuxuu la mid yahay dhumucyada kale ee isku xidhka, laakiin leh qaabab sahlan.
Waqtiga boostada: Mar-16-2023