Cellulose ipolysaccharide inoumba mhando dzakasiyana dzeether 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). HEC ipolysaccharide inonyungudika mumvura inoshandiswa zvakanyanya mukuwedzera kusimba kwe matt ne semi-gloss architectural latex paints. Thickeners inowanikwa mumhando dzakasiyana dze viscosity uye thickeners ne cellulose iyi dzine ruvara rwakanaka uye kugadzikana kwekuchengetedza.
Hunhu hwekuyera, kudzivirira kupwanyika, kugadzira firimu uye kudzivirira kudzika kwefirimu rekuputira hunoenderana nehuremu hweHEC. HEC nedzimwe polymers dzisingasanganisirwe nemvura dzinoita kuti jira rive remvura. Cellulose thickeners dzinogona kushandiswa dzoga kana pamwe chete nedzimwe thickeners kuti dziwane rheology yakakosha. Cellulose ethers dzinogona kuva nehuremu hwakasiyana hwemamorekuru uye magiredhi akasiyana e viscosity, kubva pa low molecular weight 2% aqueous solution ine viscosity inosvika 10 MPS kusvika pa high relative molecular weight viscosity ye100 000 MP.S. Magiredhi mashoma e molekyuli anowanzo shandiswa se protective colloids mu latex paint emulsion polymerization, uye magiredhi akajairika (viscosity 4 800–50 000 MP·S) anoshandiswa se thickeners. Maitiro erudzi urwu rwe thickener imhaka yekunyorovesa kwakawanda kwehydrogen bonds uye kusangana pakati pemaketani ayo 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 kudonha, kugona kuenzana, kupenya kwakanaka uye kudzivirira kutsvuka kwemavara. Inoshandiswa zvakanyanya uye haina mhedzisiro yakaipa pakuumbwa kwependi yelatex ine saizi yakanaka. Inoshanda zvakanaka pakugadzira firimu uye inoshanda zvakanaka pakudzivirira ngura. Iyi associative thickener inoshanda zvirinani ne vinyl acetate copolymer systems, uye mashandiro ayo akafanana nemamwe associative thickeners, asi ine mafomura ari nyore.
Nguva yekutumira: Kurume-16-2023