Hydroxyethyl cellulose (HEC) yog ib yam khoom dawb los yog daj daj, tsis muaj ntxhiab, tsis muaj tshuaj lom fibrous los yog hmoov khoom. Nws yog ua los ntawm cov paj rwb nyoos los yog cov pulp refined uas tau muab tso rau hauv 30% kua caustic soda. Tom qab ib nrab teev, nws raug coj tawm thiab nias. Nias kom txog thaum qhov sib piv ntawm cov dej alkaline ncav cuag 1: 2.8, tom qab ntawd zom. Nws yog npaj los ntawm kev sib xyaw etherification thiab yog cov cellulose ethers uas tsis yog ionic soluble. Hydroxyethyl cellulose yog ib qho tseem ceeb thickener hauv cov xim latex. Cia peb tsom mus rau yuav ua li cas siv hydroxyethyl cellulose HEC hauv cov xim latex thiab cov kev ceev faj.
1. Nruab nrog niam cawv rau kev siv: ua ntej siv hydroxyethyl cellulose HEC los npaj niam cawv nrog qhov concentration siab dua, thiab tom qab ntawd ntxiv rau cov khoom. Qhov zoo ntawm txoj kev no yog tias nws muaj kev ywj pheej ntau dua thiab tuaj yeem ntxiv ncaj qha 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 tshuab ua kom siab, thiab tsuas yog qee lub tshuab ua kom muaj zog txaus los khaws cov hydroxyethyl cellulose sib npaug hauv cov tshuaj tuaj yeem txuas ntxiv mus yam tsis tau nres Do kom txog thaum yaj tag rau hauv cov tshuaj viscous. Txawm li cas los xij, nws yuav tsum tau sau tseg tias cov tshuaj fungicide 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 rau hauv lub thoob loj uas muaj lub tshuab sib tov siab. Pib do tas li ntawm qhov ceev qis thiab maj mam lim cov hydroxyethyl cellulose rau hauv cov tshuaj kom sib npaug. Txuas ntxiv do kom txog thaum txhua yam khoom me me raug dej. Tom qab ntawd ntxiv cov tshuaj preservatives thiab ntau yam khoom ntxiv. Xws li cov xim, cov khoom pab dispersing, dej ammonia, thiab lwm yam. Do kom txog thaum tag nrho cov hydroxyethyl cellulose HEC yaj tag (qhov viscosity ntawm cov tshuaj nce ntxiv pom tseeb) thiab tom qab ntawd ntxiv lwm yam khoom hauv cov mis rau kev ua haujlwm.
Txij li thaum cov hydroxyethyl cellulose HEC uas kho qhov chaw yog cov hmoov lossis fibrous khoom, thaum npaj cov hydroxyethyl cellulose niam cawv, them sai sai rau cov ntsiab lus hauv qab no:
(1) Thaum siv cov hydroxyethyl cellulose HEC uas muaj viscosity siab, qhov concentration ntawm cov cawv niam yuav tsum tsis txhob siab tshaj 2.5-3% (los ntawm qhov hnyav), txwv tsis pub cov cawv niam yuav nyuaj rau kev tuav.
(2) Ua ntej thiab tom qab ntxiv hydroxyethyl cellulose HEC, nws yuav tsum tau do tas li kom txog thaum cov tshuaj tiav thiab meej.
(3) Ntau li ntau tau, ntxiv cov tshuaj tua kab mob ua ntej.
(4) Qhov kub ntawm dej thiab pH ntawm dej muaj kev sib raug zoo rau kev yaj ntawm hydroxyethyl cellulose, yog li yuav tsum tau them sai sai.
(5) Tsis txhob ntxiv qee yam alkaline rau hauv qhov sib tov ua ntej cov hmoov hydroxyethyl cellulose raug tsau nrog dej. Kev tsa pH tom qab tsau yuav pab yaj.
(6) Nws yuav tsum tau maj mam sifted rau hauv lub tank sib tov, thiab tsis txhob ntxiv ntau ntau lossis ncaj qha ntxiv hydroxyethyl cellulose uas tau tsim cov lumps thiab pob rau hauv lub tank sib tov.
Cov yam tseem ceeb uas cuam tshuam rau qhov viscosity ntawm cov xim latex:
(1) Kev xeb ntawm cov khoom ua kom tuab los ntawm cov kab mob me me.
(2) Hauv cov txheej txheem ua xim, seb cov kauj ruam ntawm kev ntxiv cov thickener puas tsim nyog.
(3) Seb qhov ntau ntawm cov tshuaj ua kom nto thiab dej siv rau hauv cov mis pleev xim puas tsim nyog.
(4) Qhov sib piv ntawm cov nqi ntawm lwm cov khoom ua kom tuab ntuj rau qhov ntau ntawm hydroxyethyl cellulose hauv cov xim pleev xim.
(5) Thaum cov roj hmab latex raug tsim, cov ntsiab lus ntawm cov catalysts seem thiab lwm yam oxides.
(6) Qhov kub thiab txias dhau thaum lub sijhawm tawg vim yog kev nplawm ntau dhau.
(7) Cov pa npuas ntau ntxiv 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 qhov viscosity txo qis dhau qhov ntau no. Nws muaj cov khoom ntawm thickening, suspending, binding, emulsifying, dispersing, tswj cov dej noo thiab tiv thaiv colloid. Cov tshuaj hauv ntau yam viscosity tuaj yeem npaj tau. Tsis ruaj khov nyob rau hauv qhov kub thiab txias ib txwm muaj, tsis txhob muaj dej noo, cua sov, thiab kub siab, thiab muaj cov ntsev solubility zoo heev rau dielectrics, thiab nws cov kua dej aqueous raug tso cai kom muaj cov ntsev ntau thiab tseem ruaj khov.
Lub sijhawm tshaj tawm: Plaub Hlis-01-2023