Cellulose inonzi polysaccharide inoumba ethers yakasiyana-siyana inonyungudika mumvura. Cellulose thickeners is nonionic water-soluble polymers. Nhoroondo yekushandiswa kwayo yakareba kwazvo, inopfuura makore makumi matatu, uye kune marudzi akawanda. Iwo achiri kushandiswa munenge ese latex pendi uye ndiwo makuru ehukobvu. Cellulosic thickeners inoshanda zvakanyanya muaqueous system nekuti inokora mvura pachayo. Muindasitiri yependi, anonyanya kushandiswa cellulose thickeners ndeaya:methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC),hydroxypropyl methyl cellulose (HPMC)uye hydrophobically modified hydroxyethyl cellulose (HMHEC). HEC imvura inonyungudika polysaccharide inoshandiswa zvakanyanya mukukora kwematt uye semi-gloss architectural latex pendi. Mathickeners anowanikwa mune akasiyana viscosity mamakisi uye makobvu ane cellulose iyi ane yakanakisa ruvara inoenderana uye kuchengetedza kugadzikana.
Iyo yekumisikidza, anti-splash, firimu-kugadzira uye anti-sagging zvimiro zveiyo firimu rekuvhara zvinoenderana nehuremu hwema molecular.HEC. HEC uye mamwe asina-akabatana-anonyungudika mvura mapolymer anokora chikamu chemvura chekuputira. Cellulose thickeners inogona kushandiswa yega kana musanganiswa nemamwe makobvu kuti uwane yakakosha rheology. Cellulose ethers inogona kuva nehuremu hwakasiyana hwemamorekuru uye magiredhi eviscosity akasiyana, kubva pane yakaderera molecular weight 2% aqueous solution ine viscosity ingangoita 10 mP s kusvika kune yakakwirira hama molecular weight viscosity ye100 000 mP s. Low molecular uremu mamakisi anowanzo shandiswa seanodzivirira colloids mu latex pendi emulsion polymerization, uye anonyanya kushandiswa mamakisi (viscosity 4 800–50 000 mP·s) anoshandiswa seanokora. Iyo nzira yerudzi urwu rwekukora imhaka yeiyo yakakwira hydration yehydrogen zvisungo uye entanglement pakati pemaketani emamorekuru.
Traditional cellulose ndeye yakakwira molecular huremu polymer iyo inokora zvakanyanya kuburikidza nekupinda pakati pemacheni. Nekuda kweiyo viscosity yakakwira pane yakaderera shear rate, iyo yekuenzanisa pfuma haina kunaka, uye inokanganisa kupenya kweiyo firimu yekupfeka. Pakukwirira kweshear rate, viscosity yakaderera, kupikisa kwekuputika kwefirimu yekuputira kwakashata, uye kuzara kwefirimu yekuputira hakuna kunaka. Maitiro ekushandisa eHEC, akadai sebrashi kuramba, kufirita uye roller spatter, ane hukama zvakananga nesarudzo yekukora. Zvakare zvimiro zvayo zvekuyerera senge leveling uye sag resistance zvinonyanya kukanganiswa nema thickeners.
Hydrophobically modified cellulose (HMHEC) is a cellulose thickener ine hydrophobic modification pane mamwe matavi cheni (anoverengeka akareba-cheni alkyl mapoka anounzwa pamwe chete neketani huru yechimiro). Uku kupfekedza kune viscosity yakakwirira pamazinga eshear uye saka zvirinani kuumbwa kwemafirimu. Zvakadai seNatrosol Plus Giredhi 330, 331, Cellosize SG-100, Bermocoll EHM-100. Kukora kwahwo kunofananidzwa neiyo cellulose ether thickeners ine yakakura zvikuru hama molecular mass. Inovandudza viscosity uye kuenzana kweICI, uye inoderedza kushushikana kwepamusoro. Semuenzaniso, kushushikana kwepamusoro kweHEC inenge 67 mN / m, uye kukanganiswa kwepamusoro kweHMHEC ndeye 55 ~ 65 mN / m.
HMHEC ine yakanakisa sprayability, anti-sagging, leveling zvivakwa, yakanaka gloss uye anti-pigment caking. Inoshandiswa zvakanyanya uye haina mhedzisiro yakaipa pakuumbwa kwefirimu yefine particle size latex pendi. Yakanaka firimu-kugadzira kuita uye anti-corrosion performance. Iyi chaiyo associative thickener inoshanda zvirinani nevinyl acetate copolymer masisitimu uye ine zvivakwa zvakafanana kune mamwe asociative thickeners, asi ane nyore maumbirwo.
Nguva yekutumira: Kubvumbi-25-2024