Hydroxyethyl cellulose (HEC) yog xim dawb los yog lub teeb daj, tsis muaj ntxhiab, tsis muaj tshuaj lom fiber ntau lossis hmoov hmoov. Nws yog ua los ntawm cov paj rwb nyoos linters los yog refined pulp soaked nyob rau hauv 30% kua caustic soda. Tom qab ib nrab teev, nws raug tshem tawm thiab nias. Nyem kom txog thaum qhov sib piv ntawm cov dej alkaline nce mus txog 1: 2.8, ces crush. Nws yog npaj los ntawm etherification cov tshuaj tiv thaiv thiab belongs rau non-ionic soluble cellulose ethers. Hydroxyethyl cellulose yog ib qho tseem ceeb thickener nyob rau hauv latex xim. Cia peb tsom ntsoov rau yuav ua li cas siv hydroxyethyl cellulose HEC hauv cov xim latex thiab kev ceev faj.
1. Nruab nrog niam cawv rau kev siv: thawj zaug siv hydroxyethyl cellulose HEC los npaj cov niam cawv uas muaj siab dua, thiab tom qab ntawd ntxiv rau cov khoom. Qhov kom zoo dua ntawm txoj kev no yog tias nws muaj qhov yooj yim dua thiab tuaj yeem ncaj qha ntxiv rau cov khoom tiav, tab sis nws yuav tsum tau khaws cia kom zoo. Cov kauj ruam ntawm txoj kev no zoo ib yam li feem ntau ntawm cov kauj ruam hauv txoj kev 2; qhov sib txawv yog tias tsis tas yuav muaj lub siab-shear agitator, thiab tsuas yog qee cov agitators uas muaj lub zog txaus los ua kom cov hydroxyethyl cellulose tsis sib haum xeeb hauv cov tshuaj tuaj yeem txuas ntxiv yam tsis tau nres do kom txog thaum yaj tag rau hauv cov kua nplaum. Txawm li cas los xij, nws yuav tsum raug sau tseg tias cov tshuaj tua kab mob yuav tsum tau ntxiv rau niam cawv sai li sai tau.
2. Ntxiv ncaj qha thaum lub sijhawm tsim khoom: txoj kev no yog qhov yooj yim tshaj plaws thiab siv sijhawm luv tshaj plaws. Ntxiv dej huv mus rau ib lub thoob loj uas muaj lub siab shear tov. Pib do tsis tu ncua ntawm qis ceev thiab maj mam sieve cov hydroxyethyl cellulose rau hauv cov tshuaj sib npaug. Txuas ntxiv mus kom txog thaum tag nrho cov khoom yog soaked. Tom qab ntawd ntxiv preservatives thiab ntau yam additives. Xws li pigments, dispersing aids, ammonia dej, thiab lwm yam. Do kom txog thaum tag nrho cov hydroxyethyl cellulose HEC yog yaj tag (lub viscosity ntawm cov tshuaj tsub kom pom tseeb) thiab ces ntxiv lwm yam khoom nyob rau hauv cov mis rau cov tshuaj tiv thaiv.
Txij li qhov chaw kho hydroxyethyl cellulose HEC yog hmoov lossis fibrous khoom, thaum npaj hydroxyethyl cellulose niam cawv, xyuam xim rau cov ntsiab lus hauv qab no:
(1) Thaum siv high-viscosity hydroxyethyl cellulose HEC, qhov concentration ntawm niam cawv yuav tsum tsis txhob siab tshaj 2.5-3% (los ntawm qhov hnyav), txwv tsis pub leej niam cawv yuav nyuaj.
(2) Ua ntej thiab tom qab ntxiv hydroxyethyl cellulose HEC, nws yuav tsum tau nplawm tsis tu ncua kom txog thaum cov tshuaj yog pob tshab thiab meej.
(3) Ntau li ntau tau, ntxiv cov tshuaj tua kab mob ua ntej.
(4) Cov dej kub thiab pH tus nqi ntawm cov dej muaj kev sib raug zoo rau kev tawg ntawm hydroxyethyl cellulose, yog li yuav tsum tau them nyiaj tshwj xeeb.
(5) Tsis txhob ntxiv qee cov tshuaj alkaline rau qhov sib tov ua ntej cov hmoov hydroxyethyl cellulose yog soaked nrog dej. Nce pH tom qab soaking yuav pab yaj.
(6) Nws yuav tsum tau maj mam sifted rau hauv lub tank sib tov, thiab tsis txhob ntxiv ntau ntau los yog ncaj qha ntxiv hydroxyethyl cellulose uas tau tsim lumps thiab pob rau hauv lub tank tov.
Yam tseem ceeb cuam tshuam rau viscosity ntawm latex xim:
(1) Corrosion ntawm thickener los ntawm cov kab mob.
(2) Hauv kev tsim cov xim, seb cov kauj ruam ntawm kev ntxiv cov thickener puas tsim nyog.
(3) Seb seb tus nqi ntawm qhov chaw ua haujlwm thiab dej siv hauv cov xim pleev xim puas tsim nyog.
(4) Qhov piv ntawm tus nqi ntawm lwm yam ntuj thickeners rau tus nqi ntawm hydroxyethyl cellulose nyob rau hauv cov xim formulation.
(5) Thaum cov latex tsim, cov ntsiab lus ntawm residual catalysts thiab lwm yam oxides.
(6) Qhov kub yog siab dhau thaum lub sij hawm dispersion vim yog stirring ntau dhau.
(7) Cov npuas npuas ntau nyob hauv cov xim, qhov viscosity siab dua.
Lub viscosity ntawm hydroxyethyl cellulose HEC hloov me ntsis hauv pH ntau ntawm 2-12, tab sis cov viscosity txo qis tshaj qhov no. Nws muaj cov yam ntxwv ntawm thickening, suspending, khi, emulsifying, dispersing, tswj cov dej noo thiab tiv thaiv colloid. Kev daws teeb meem hauv qhov sib txawv viscosity tuaj yeem npaj tau. Tsis ruaj tsis khov nyob rau hauv ib txwm kub thiab siab, zam cov av noo, tshav kub, thiab kub, thiab muaj exceptional zoo ntsev solubility rau dielectrics, thiab nws aqueous tov yog tso cai kom muaj siab concentrations ntawm ntsev thiab nyob ruaj khov.
Post lub sij hawm: Apr-01-2023