Hydroxyethyl Cellulose (HEC) yog ib qho tseem ceeb ntawm cov dej-soluble nonionic cellulose ether, uas yog dav siv nyob rau hauv architectural txheej, tshwj xeeb tshaj yog cov xim latex. Raws li cov thickener ua tau zoo, kev tiv thaiv colloid, ncua tus neeg sawv cev thiab kev pab ua zaj duab xis, nws ua kom zoo dua qub ntawm cov xim latex, txhim kho cov khoom siv ntawm cov xim thiab pom cov nyhuv ntawm cov khoom tiav.
1. Cov qauv tshuaj thiab cov khoom ntawm hydroxyethyl cellulose
Hydroxyethyl cellulose yog cellulose derivative tsim los ntawm kev qhia ib pawg hydroxyethyl rau hauv cellulose molecule. Nws yog dej-soluble polymer compound. Nws cov qauv tshuaj txiav txim siab nws cov dej solubility zoo heev thiab thickening zog. Thaum yaj nyob rau hauv dej, nws muaj peev xwm tsim ib tug viscous tov nrog zoo adhesion, film-forming thiab thickening teebmeem. Cov khoom no ua lub luag haujlwm tseem ceeb hauv cov xim latex.
Hydroxyethyl cellulose feem ntau yog dawb los yog lub teeb daj hmoov los yog granules, uas yog yooj yim yaj nyob rau hauv txias los yog dej kub los tsim ib tug ruaj khov colloidal tov. Nws cov tshuaj muaj kev ruaj ntseg zoo thiab tuaj yeem tiv taus acid, alkali, redox thiab microbial degradation. Tsis tas li ntawd, vim qhov tsis yog-ionic ntawm hydroxyethyl cellulose, nws tsis muaj tshuaj lom nrog lwm cov khoom xyaw hauv cov xim pleev xim xws li pigments, fillers lossis additives, yog li nws muaj kev sib raug zoo hauv cov xim latex.
2. Lub mechanism ntawm kev txiav txim ntawm hydroxyethyl cellulose nyob rau hauv latex xim
Nyob rau hauv cov xim latex, lub luag hauj lwm ntawm hydroxyethyl cellulose yog feem ntau xav txog nyob rau hauv thickening, dej tuav, txhim khu kev ruaj ntseg thiab txhim kho kev ua hauj lwm:
Thickening nyhuv: Hydroxyethyl cellulose, raws li ib tug npaum thickener, yuav ua rau kom cov viscosity ntawm latex xim thiab ua rau nws thixotropy. Qhov no tsis tsuas yog tiv thaiv cov xim ntawm sagging thaum lub sij hawm cia thiab daim ntawv thov, tab sis kuj ua rau cov xim ntau dua txawm tias thaum dov los yog txhuam. Cov nyhuv thickening kom zoo pab tswj cov rheology ntawm cov xim latex, ua kom muaj kev xav zoo thaum thov, thiab txhim kho cov yeeb yaj kiab.
Kev tuav dej: Hydroxyethyl cellulose muaj dej tuav zoo. Thaum lub sij hawm ziab txheej txheem ntawm cov xim latex, nws tuaj yeem tiv thaiv dej los ntawm evaporating sai heev, yog li ncua lub sij hawm ntub dej qhib ntawm cov xim thiab xyuas kom meej kev tsim kho. Tsis tas li ntawd, kev tuav dej zoo kuj tseem tuaj yeem txo qhov tawg ntawm cov txheej txheej zaj duab xis tom qab ziab, yog li txhim kho tag nrho cov txheej txheem zoo.
Kev ruaj ntseg: Hydroxyethyl cellulose, raws li kev tiv thaiv colloid, tuaj yeem tiv thaiv pigments thiab fillers los ntawm kev nyob hauv cov xim latex. Nws tuaj yeem tsim cov kab ke ruaj khov colloidal los ntawm nws cov kua nplaum kom sib npaug ntawm txhua qhov khoom thiab ua kom ruaj khov ntawm cov xim. Nyob rau tib lub sijhawm, hydroxyethyl cellulose tuaj yeem txhim kho kev ruaj ntseg ntawm emulsion hais thiab zam kev delamination thiab agglomeration ntawm latex system thaum khaws cia.
Kev tsim kho: Thaum lub sij hawm tsim kho, cov thickening thiab lubricating cuam tshuam ntawm hydroxyethyl cellulose ua rau cov xim latex muaj cov txheej txheem zoo thiab qib qib, uas tuaj yeem txo cov txhuam hniav zoo thiab txhim kho qhov smoothness ntawm txheej zaj duab xis. Tsis tas li ntawd, vim tias hydroxyethyl cellulose tuaj yeem txhim kho cov thixotropy ntawm cov xim, cov xim latex yog ib qho yooj yim rau kev khiav lag luam thaum lub sij hawm tha xim, muaj fluidity zoo tsis muaj dripping, thiab yog haum rau ntau yam kev tsim kho, xws li txhuam, cov menyuam txheej thiab tshuaj tsuag. .
3. Daim ntawv thov tshwj xeeb ntawm hydroxyethyl cellulose hauv cov xim latex
Txhim kho qhov ruaj khov ntawm cov xim: Ntxiv qhov tsim nyog ntawm hydroxyethyl cellulose rau cov xim pleev xim xim tuaj yeem txhim kho cov khoom tiv thaiv kev daws teeb meem ntawm cov xim thiab zam kom tsis txhob muaj cov pigments thiab fillers. Lub dispersion ntawm hydroxyethyl cellulose nyob rau hauv cov txheej txheem tuaj yeem tswj tau qhov sib xws ntawm txheej txheej txheej thiab txuas lub sijhawm cia ntawm cov khoom.
Txhim kho cov khoom rheological ntawm coatings: Cov khoom rheological ntawm cov xim latex yog qhov tseem ceeb rau kev tsim kho kom zoo. Hydroxyethyl cellulose tuaj yeem siv nws cov thixotropy tshwj xeeb los ua kom cov xim ntws yooj yim nyob rau hauv siab shear quab yuam (xws li thaum pleev xim), thiab tuav lub siab viscosity nyob rau hauv qis shear force (xws li thaum sawv), tiv thaiv Sag. Cov yam ntxwv no ua rau cov xim latex muaj kev tsim kho zoo dua thiab txheej txheej, txo qis sagging thiab dov cov cim.
Txhim kho qhov pom kev pom thiab lub cev lub cev ntawm cov yeeb yaj kiab txheej: Hydroxyethyl cellulose plays lub luag haujlwm tseem ceeb hauv cov txheej txheem tsim zaj duab xis. Nws tuaj yeem tsis tsuas yog txhim kho qhov smoothness ntawm cov xim zaj duab xis, tab sis kuj txhim khu kev hnav tsis kam thiab dej tsis kam ntawm cov xim zaj duab xis, ncua kev pab cuam lub neej ntawm cov xim zaj duab xis. Tsis tas li ntawd, vim nws cov dej tuav tau zoo, cov txheej txheej dries tusyees, pab kom tsis txhob muaj teeb meem xws li wrinkles, pinholes thiab cracking, ua rau saum npoo ntawm txheej smoother.
Txhim kho ib puag ncig kev ua tau zoo: Hydroxyethyl cellulose yog ib qho derivative ntawm natural cellulose, muaj biodegradability zoo heev, thiab yuav tsis ua phem rau ib puag ncig. Piv nrog cov khoom siv hluavtaws, nws yog ib puag ncig zoo thiab ua tau raws li cov khoom siv niaj hnub ntsuab ntsuab. Tsis tas li ntawd, nws tsis muaj volatile organic compounds (VOC), yog li siv hydroxyethyl cellulose hauv cov xim latex yuav pab txo qis VOC emissions thiab txhim kho huab cua zoo ntawm qhov chaw tsim kho.
Raws li ib qho tseem ceeb additive nyob rau hauv cov xim latex, hydroxyethyl cellulose tuaj yeem txhim kho kev tsim kho kev ua tau zoo thiab cov txheej txheem kawg ntawm cov xim latex los ntawm nws cov thickening zoo heev, dej tuav, ruaj khov thiab ua yeeb yaj kiab. Nyob rau tib lub sijhawm, vim nws qhov kev tiv thaiv ib puag ncig thiab cov yam ntxwv VOC qis, hydroxyethyl cellulose ua tau raws li cov kev cai ntsuab thiab ib puag ncig ntawm kev lag luam niaj hnub txheej txheej. Nrog rau kev nce qib ntawm kev siv thev naus laus zis tas mus li, daim ntawv thov kev cia siab ntawm hydroxyethyl cellulose hauv cov xim latex yuav dav dua, muab cov kev daws teeb meem zoo dua rau kev txhim kho kom ruaj khov ntawm kev lag luam vaj tsev coatings.
Post lub sij hawm: Sep-20-2024