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 Hydrophobically modified hydroxyethyl 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 xidhan tahay miisaanka unugyaduHEC. 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 kaligiis ama lagu daro dhumucyada kale si loo helo rheology gaar ah. Ethers 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 ah 10 mP s 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 inta badan la isticmaalo (viscosity 4 800-50 000 mP·s) ayaa loo isticmaalaa dhumuc ahaan. Habka dhumucda noocaan ah waxaa sabab u ah fuuq-baxa sare ee curaarta hydrogen iyo isku dhafka 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 sag-gudaha ayaa inta badan saameeya 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 dhumucda 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 wuxuuna leeyahay sifooyin la mid ah dhumucyada kale ee associative, laakiin leh qaabab ka fudud.
Waqtiga boostada: Abriil-25-2024