Cellulose ipolysaccharide inoumba mhando dzakasiyana dzeethers dzinonyungudika mumvura. Cellulose thickeners ipolymers dzisinganyungudike mumvura. Nhoroondo yekushandiswa kwayo yakareba kwazvo, inopfuura makore makumi matatu, uye kune mhando dzakawanda. Ichiri kushandiswa munenge pendi dzese dzelatex uye ndiyo inonyanya kushandiswa mu thickeners. Cellulose thickeners inoshanda zvikuru mu aqueous systems nekuti inonyungudutsa mvura pachayo. Muindasitiri yependi, cellulose thickeners dzinonyanya kushandiswa ndeidzi:methyl cellulose (MC), hydroxyethyl cellulose (HEC), ethyl hydroxyethyl cellulose (EHEC), hydroxypropyl cellulose (HPC),hydroxypropyl methyl cellulose (HPMC)uye hydroxyethyl cellulose (HMHEC) inogadziriswa mumvura. HEC ipolysaccharide inonyungudika mumvura inoshandiswa zvakanyanya mukukora kwependi dzelatex dzakaita sematt ne semi-gloss. Matinji anowanikwa mumhando dzakasiyana dze viscosity uye matinji ane cellulose iyi ane mavara anoenderana zvakanaka uye kugadzikana kwekuchengetedza.
Hunhu hwekuyera, kudzivirira kupwanyika, kugadzira firimu uye kudzivirira kudonha kweganda hunoenderana nehuremu hwemamorekuru efirimu iri.HECHEC nedzimwe polymers dzisingasanganisike nemvura dzinoita kuti pave nekukora kwemvura. Cellulose thickeners dzinogona kushandiswa dzoga kana pamwe chete nedzimwe thickeners kuti pave ne rheology yakakosha. Cellulose ethers dzinogona kuva nehuremu hwakasiyana hwemamorekuru uye huremu hwakasiyana hwe viscosity, kubva pa low molecular weight 2% aqueous solution ine viscosity inosvika 10 mP s kusvika pa high relative molecular weight viscosity ye 100 000 mP s. Huremu hwakaderera hwemamorekuru hunowanzo shandiswa se protective colloids mu latex paint emulsion polymerization, uye huremu hunoshandiswa zvakanyanya (viscosity 4 800–50 000 mP·s) hunoshandiswa se thickeners. Maitiro emhando iyi ye thickener imhaka yekunyorovesa kwakawanda kwehydrogen bonds uye kusangana pakati pemaketani emamorekuru.
Cellulose yechinyakare ipolymer ine huremu hwakawanda inokora zvikuru kuburikidza nekupindirana pakati pemaketani emamorekuru. Nekuda kwekusimba kwakanyanya padanho rakaderera rekuchekwa, hunhu hwekuenzana hwakaderera, uye hunokanganisa kupenya kwefirimu rekumonera. Padanho rakakwirira rekuchekwa, kusimba kwakaderera, kuramba kupenya kwefirimu rekumonera kwakaderera, uye kuzara kwefirimu rekumonera hakuna kunaka. Hunhu hwekushandisa HEC, senge kuramba mabhurashi, kupfura uye kuputira kweroller, zvine chekuita zvakananga nesarudzo yemuchina wekupinza. Zvakare hunhu hwayo hwekuyerera senge kuramba kuenzana uye kusadzika hunonyanya kukanganiswa nemidziyo yekupinza.
Hydrophobically modified cellulose (HMHEC) chinhu chinosimbisa cellulose chine hydrophobic modification pane mamwe macheni ane matavi (mapoka akati wandei ealkyl ane marefu anounzwa pamwe chete necheni huru yechimiro). Kuputira uku kune viscosity yakakwira pamazinga akakwira ekuchekwa uye nekudaro kuumbwa kwefirimu kuri nani. Zvakadai seNatrosol Plus Grade 330, 331, Cellosize SG-100, Bermocoll EHM-100. Kusimba kwayo kwakafanana nekwema cellulose ether thickeners ane mamorekuru akawanda. Inovandudza viscosity uye leveling yeICI, uye inoderedza kusimba kwepamusoro. Semuenzaniso, kusimba kwepamusoro kweHEC kunenge 67 mN/m, uye kusimba kwepamusoro kweHMHEC ku55~65 mN/m.
HMHEC ine simba rakanaka rekupfapfaidza, kudzivirira kudzika, kuenzana, kupenya kwakanaka uye kudzivirira pigment caking. Inoshandiswa zvakanyanya uye haina mhedzisiro yakaipa pakuumbwa kwefirimu re latex pendi ine saizi yakanaka. Inoshanda zvakanaka pakugadzira firimu uye inodzivirira ngura. Iyi associative thickener inoshanda zvirinani ne vinyl acetate copolymer systems uye ine hunhu hwakafanana nedzimwe associative thickeners, asi ine mafomura ari nyore.
Nguva yekutumira: Kubvumbi-25-2024