Cellulose wani polysaccharide ne wanda ke samar da nau'ikan ethers masu narkewa cikin ruwa. Masu kauri na cellulose polymers ne masu narkewa cikin ruwa marasa ionic. Tarihin amfani da shi yana da tsawo sosai, fiye da shekaru 30, kuma akwai nau'ikan iri-iri. Har yanzu ana amfani da su a kusan dukkan fenti na latex kuma sune babban abin da ke ƙara kauri. Masu kauri na cellulosic suna da tasiri sosai a tsarin ruwa saboda suna ƙara kauri da kansu. A masana'antar fenti, masu kauri na cellulose da aka fi amfani da su sune: methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC), hydroxypropyl methyl cellulose (HPMC) da hydrophobically modified hydroxyethyl cellulose (HMHEC). HEC polysaccharide ne mai narkewa cikin ruwa wanda ake amfani da shi sosai wajen ƙara kauri na fenti na matt da semi-gloss na gine-gine. Masu kauri suna samuwa a cikin nau'ikan danko daban-daban kuma masu kauri tare da wannan cellulose suna da kyakkyawan jituwa da launi da kwanciyar hankali na ajiya.
Halayen daidaita, hana fesawa, ƙirƙirar fim da hana tsagewa na fim ɗin rufewa sun dogara ne akan nauyin kwayoyin halitta na HEC. HEC da sauran polymers masu narkewar ruwa waɗanda ba su da alaƙa da juna suna ƙara girman matakin ruwa na murfin. Ana iya amfani da masu kauri cellulose su kaɗai ko tare da wasu masu kauri don samun ilimin rheology na musamman. Cellulose ethers na iya samun nau'ikan nauyin kwayoyin halitta daban-daban da kuma nau'ikan danko daban-daban, tun daga ƙaramin maganin ruwa mai nauyin kwayoyin halitta 2% tare da danko na kusan MPS 10 zuwa danko na nauyin kwayoyin halitta mai girman 100 000 MP.S. Yawancin lokaci ana amfani da ƙananan matakan nauyin kwayoyin halitta azaman colloids masu kariya a cikin polymerization na fenti na latex, kuma ana amfani da mafi yawan matakan (danko 4 800–50 000 MP·S) azaman masu kauri. Tsarin wannan nau'in mai kauri ya faru ne saboda yawan ruwan da ke cikin haɗin hydrogen da kuma haɗuwa tsakanin sarƙoƙin kwayoyin halittarsa.
Cellulose na gargajiya wani nau'in polymer ne mai nauyin kwayoyin halitta wanda ke kauri galibi ta hanyar haɗakar sarƙoƙi tsakanin sarƙoƙin kwayoyin halitta. Saboda yawan danko a ƙarancin zafin yankewa, ƙarfin daidaitawar ba shi da kyau, kuma yana shafar sheƙi na fim ɗin rufewa. A babban saurin yankewa, danko yana da ƙasa, juriyar fesawa na fim ɗin rufewa ba shi da kyau, kuma cikar fim ɗin rufewa ba shi da kyau. Halayen aikace-aikacen HEC, kamar juriyar goga, yin fim da kuma spatter na naɗawa, suna da alaƙa kai tsaye da zaɓin mai kauri. Haka kuma halayen kwararar sa kamar matakin da juriyar sag suna shafar masu kauri.
Cellulose mai gyaran hydrophobic (HMHEC) wani abu ne mai kauri na cellulose wanda ke da gyaran hydrophobic akan wasu sarƙoƙi masu reshe (an gabatar da ƙungiyoyin alkyl masu dogon zango da yawa tare da babban sarkar tsarin). Wannan murfin yana da ɗanko mafi girma a yawan yankewa kuma saboda haka yana da kyau a samar da fim. Kamar Natrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Tasirin kaurinsa yayi daidai da na cellulose ether thickeners tare da babban nauyin kwayoyin halitta. Yana inganta danko da matakin ICI, kuma yana rage tashin hankali a saman. Misali, tashin hankali a saman HEC shine kusan 67 MN/m, kuma tashin hankali a saman HMHEC shine 55~65 MN/m.
HMHEC yana da kyakkyawan feshi, hana tsagewa, da kuma daidaita shi, yana da kyau da kuma hana ƙuraje. Ana amfani da shi sosai kuma ba shi da wani mummunan tasiri ga samuwar fim ɗin fenti mai girman barbashi. Kyakkyawan aikin samar da fim da kuma aikin hana tsagewa. Wannan musamman mai kauri yana aiki mafi kyau tare da tsarin vinyl acetate copolymer, kuma aikinsa yayi kama da sauran masu kauri masu haɗawa, amma tare da tsari mai sauƙi.
Lokacin Saƙo: Maris-16-2023