Hydroxyethyl cellulose yog dab tsi?

Hydroxyethyl cellulose yog dab tsi?

Hydroxyethyl cellulose (HEC), dawb los yog daj daj, tsis muaj ntxhiab, tsis muaj tshuaj lom fibrous lossis hmoov khoom, npaj los ntawm etherification ntawm alkaline cellulose thiab ethylene oxide (los yog chlorohydrin), teej tug mus rau lub genus Nonionic soluble cellulose ethers. Vim HEC muaj cov khoom zoo xws li thickening, suspending, dispersing, emulsifying, bonding, film-forming, tiv thaiv ya raws thiab muab kev tiv thaiv colloids, nws tau siv dav hauv kev tshawb nrhiav roj, txheej, kev tsim kho, tshuaj thiab zaub mov, textiles, papermaking thiab polymers. Polymerization thiab lwm yam.

Hydroxyethyl cellulose yog siv dav hauv kev lag luam coatings. Cia peb saib seb nws ua haujlwm li cas hauv coatings:

Yuav ua li cas tshwm sim thaum hydroxyethyl cellulose ntsib cov txheej txheem dej?

Raws li cov tsis-ionic surfactant, hydroxyethyl cellulose muaj cov khoom nram qab no ntxiv rau cov thickening, suspending, binding, flotation, film-forming, dispersing, dej tuav thiab muab kev tiv thaiv colloids:

HEC yog soluble nyob rau hauv dej kub los yog txias, thiab tsis precipitate ntawm kub los yog boiling, ua rau nws muaj ib tug ntau yam ntawm solubility thiab viscosity yam ntxwv, raws li zoo raws li tsis-thermal gelling;

Lub peev xwm tuav dej yog ob zaug ntawm methyl cellulose, thiab nws muaj kev tswj xyuas zoo dua;

Tsis yog-ionic nws tus kheej tuaj yeem ua ke nrog ntau yam ntawm lwm cov dej-soluble polymers, surfactants, thiab ntsev, thiab yog ib qho zoo heev colloidal thickener uas muaj cov ntsiab lus electrolyte;

Piv nrog rau kev lees paub methyl cellulose thiab hydroxypropyl methyl cellulose, lub peev xwm dispersing ntawmHECyog qhov phem tshaj, tab sis kev tiv thaiv colloid muaj peev xwm yog qhov muaj zog tshaj plaws.

Txij li qhov chaw kho hydroxyethyl cellulose yog cov hmoov nplej los yog fiber ntau, Shandong Heda ceeb toom koj kom ua tib zoo mloog cov ntsiab lus hauv qab no thaum npaj hydroxyethyl cellulose niam cawv:

(1) Ua ntej thiab tom qab ntxiv hydroxyethyl cellulose, nws yuav tsum tau stirring kom txog thaum cov tshuaj yog pob tshab thiab meej.

(2) Nws yuav tsum maj mam sieved rau hauv lub thawv sib tov, thiab tsis txhob txuas ncaj qha mus rau hydroxyethyl cellulose thiab hydroxyethyl cellulose rau hauv cov khoom sib xyaw ua ke hauv qhov ntau lossis hauv daim ntawv ntawm pob thiab pob.

(3) Cov dej kub thiab pH tus nqi ntawm cov dej muaj kev sib raug zoo rau kev sib cais ntawm hydroxyethyl cellulose, yog li yuav tsum tau them nyiaj tshwj xeeb rau nws.

(4) Tsis txhob ntxiv qee cov tshuaj alkaline rau qhov sib tov ua ntej cov hmoov hydroxyethyl cellulose yog soaked nrog dej. Kev nce pH tsuas yog tom qab ntub dej yuav pab tau rau hauv kev sib cais.

(5) Raws li qhov ua tau, ntxiv cov tshuaj tua kab mob ua ntej.

(6) Thaum siv high-viscosity hydroxyethyl cellulose, qhov concentration ntawm niam cawv yuav tsum tsis txhob siab tshaj 2.5-3% (los ntawm qhov hnyav), txwv tsis pub leej niam cawv yog ib qho nyuaj rau lis.