Selulosi ni polysaccharide ikora ubwoko butandukanye bwa ethers zishobora gushonga mu mazi. Izigabanya ubushyuhe bwa selulosi ni polymers zitari izo mu mazi zishobora gushonga. Ikoreshwa ryayo ni ndende cyane, imaze imyaka irenga 30, kandi hari ubwoko bwinshi. Iracyakoreshwa mu marangi hafi ya yose ya latex kandi ni yo akoreshwa cyane mu kuzigabanya ubushyuhe. Izigabanya ubushyuhe bwa selulosi zikora neza cyane mu buryo bw'amazi kuko zigabanya ubushyuhe bw'amazi ubwabwo. Mu nganda zikora amarangi, izigabanya ubushyuhe bwa selulosi zikoreshwa cyane ni izi:selulose ya methyl (MC), selulose ya hydroxyethyl (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC),hydroxypropyl methyl cellulose (HPMC)na hydroxyethyl cellulose yahinduwe mu mazi (HMHEC). HEC ni polysaccharide ishongera mu mazi ikoreshwa cyane mu gukurura amarangi ya latex yubatswe mu buryo bwa matt na semi-gloss. Ingufu zifata ziboneka mu byiciro bitandukanye bya viscosity kandi inyunganizi zifite iyi cellulose zifite ibara ryiza cyane kandi zigumana neza n'ububiko.
Imiterere y'urupapuro rwo gutwikira, kurwanya gusenyuka, gukora filime no kurwanya kugwa biterwa n'uburemere bwa molekileHECHEC n'izindi polymer zishongesha amazi zitajyanye n'amazi zituma irangi rikomeza gushonga. Imashini zigabanya ubushyuhe mu mazi zishobora gukoreshwa zonyine cyangwa zigahuzwa n'izindi mashini zigabanya ubushyuhe kugira ngo haboneke rheology yihariye. Ether za cellulose zishobora kugira uburemere butandukanye bwa molekile n'ubwoko butandukanye bwa viscosity, kuva ku gisubizo gito cya molekile gifite uburemere bwa 2% bw'amazi gifite viscosity ya 10 mP s kugeza ku buremere bwinshi bwa molekile bwa 100 000 mP s. Ubushobozi buke bwa molekile bukunze gukoreshwa nk'ibice bikingira muri polymerization ya latex paint emulsion, kandi ubwoko bukunze gukoreshwa cyane (viscosity 4 800–50 000 mP·s) bukoreshwa nk'ibice bigabanya ubushyuhe. Uburyo ubu bwoko bw'imashini bugabanya ubushyuhe buterwa n'amazi menshi ya hydrogen bonds n'aho iminyururu ya molekile ihurira.
Selulosi gakondo ni polymeri ifite uburemere bwinshi bwa molekile irushaho gukomera binyuze mu gufungana hagati y’iminyururu ya molekile. Bitewe n’ubushyuhe bwinshi ku gipimo gito cyo gukata, ubushobozi bwo kugorora ni bubi, kandi bigira ingaruka ku rumuri rwa firime yo gusiga. Iyo igipimo cyo gukata kiri hejuru, ubushyuhe ni buke, ubushyuhe bwa firime yo gusiga ni bubi, kandi firime yo gusiga yuzuye ntabwo ari nziza. Imiterere ya HEC, nko kudakoresha uburoso, gufata amashusho no gusiga imirasire, bifitanye isano itaziguye n’ihitamo ry’icyuma gikonjesha. Nanone imiterere yayo nko kudakoresha imirasire no guhagarara igizweho ingaruka cyane n’ibikoresho bikonjesha.
Selulosi yahinduwe hifashishijwe hydrophobically (HMHEC) ni icyuma gikomeza ubwinshi bwa selulosi gifite uburyo bwo guhindura ubwinshi bwa hydrophobic ku migozi imwe n'imwe ifite amashami (amatsinda menshi ya alkyl y'imigozi miremire ashyirwa ku mugozi mukuru w'inyubako). Iki gipfukisho gifite ubunini bwinshi ku gipimo cyo hejuru cyo gukata bityo bigatuma habaho firime nziza. Nka Natrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Ingaruka zacyo zo gukuba zigereranywa n'iz'ibice bikomeza ubwinshi bwa ether bya selulosi bifite uburemere bunini bwa molekile. Binoza ubunini n'uburinganire bwa ICI, kandi bigabanya ubukana bw'ubuso. Urugero, ubukana bw'ubuso bwa HEC ni hafi 67 mN/m, naho ubukana bw'ubuso bwa HMHEC ni 55~65 mN/m.
HMHEC ifite ubushobozi bwo gusukira neza, kurwanya kugwa, ubushobozi bwo kugorora, irabagirana neza kandi irinda ibara ry'uruhu. Ikoreshwa cyane kandi nta ngaruka mbi igira ku ikorwa rya firime ry'irangi rya latex ringana n'uduce duto. Ikora neza kandi irwanya ingese. Iyi firime ikora neza ikorana neza na sisitemu za vinyl acetate copolymer kandi ifite ubushobozi nk'ubw'izindi firime zifatanya, ariko hamwe n'uburyo bworoshye bwo kuyikoresha.
Igihe cyo kohereza: 25 Mata 2024