I. Kev Taw Qhia
Hydroxyethyl Cellulose (HEC) yog cov dej-soluble polymer uas tsis yog-ionic siv dav hauv cov roj extraction, txheej txheej, kev tsim kho, tshuaj niaj hnub, papermaking thiab lwm yam. HEC yog tau los ntawm kev hloov kho tshuaj ntawm cellulose, thiab nws cov khoom thiab kev siv yog txiav txim siab los ntawm hydroxyethyl substituents ntawm cellulose molecules.
II. Cov txheej txheem ntau lawm
Cov txheej txheem tsim khoom ntawm HEC feem ntau suav nrog cov kauj ruam hauv qab no: cellulose etherification, ntxuav, lub cev qhuav dej, ziab thiab sib tsoo. Hauv qab no yog cov lus qhia ntxaws ntxaws rau txhua kauj ruam:
Cellulose etherification
Cellulose yog thawj zaug kho nrog alkali los tsim alkali cellulose (Cellulose Alkali). Cov txheej txheem no feem ntau yog ua nyob rau hauv lub reactor, siv sodium hydroxide tov los kho cov cellulose ntuj tsim alkali cellulose. Cov tshuaj chemical yog raws li nram no:
Cell-OH+NaOH →Cell-O-Na+H2OCell-OH+NaOH →Cell-O-Na+H 2O
Tom qab ntawd, alkali cellulose reacts nrog ethylene oxide los tsim hydroxyethyl cellulose. Cov tshuaj tiv thaiv yog nqa tawm nyob rau hauv kev kub siab, feem ntau 30-100 ° C, thiab cov tshuaj tiv thaiv tshwj xeeb yog raws li nram no:
Cell-O-Na+CH2CH2O →Cell-O-CH2CH2OHCell-O-Na+CH 2CH 2O →Cell-O-CH 2CH 2OH
Cov tshuaj tiv thaiv no yuav tsum muaj kev tswj xyuas qhov kub thiab txias, siab thiab tus nqi ntawm ethylene oxide ntxiv los xyuas kom meej qhov sib xws thiab zoo ntawm cov khoom.
Ntxuav
Cov txiaj ntsig tsis zoo HEC feem ntau muaj cov tsis muaj tshuaj alkali, ethylene oxide thiab lwm yam khoom siv los ntawm cov khoom lag luam, uas yuav tsum tau muab tshem tawm los ntawm ntau cov dej ntxhua los yog cov organic hnyav ntxuav. Cov dej ntau yog xav tau thaum lub sijhawm ntxuav dej, thiab cov dej khib nyiab tom qab ntxuav yuav tsum tau kho thiab tawm.
Lub cev qhuav dej
HEC ntub dej tom qab ntxuav yuav tsum tau lub cev qhuav dej, feem ntau yog los ntawm lub tshuab nqus tsev lim lossis centrifugal sib cais kom txo cov dej noo.
Qhuav
Lub cev qhuav dej HEC yog qhuav, feem ntau yog los ntawm kev ziab kom qhuav lossis flash ziab. Qhov kub thiab lub sij hawm yuav tsum tau tswj nruj me ntsis thaum lub sij hawm ziab kom tsis txhob kub degradation los yog agglomeration.
Sib tsoo
Lub qhuav HEC thaiv yuav tsum tau muab tso rau hauv av thiab sieved kom ua tiav ib qho me me particle loj tis, thiab thaum kawg tsim cov hmoov los yog granular khoom.
III. Cov yam ntxwv ua haujlwm
Dej solubility
HEC muaj cov dej solubility zoo thiab tuaj yeem yaj sai sai hauv cov dej txias thiab dej kub los tsim cov pob tshab lossis cov kua nplaum. Cov cuab yeej solubility no ua rau nws dav siv los ua cov thickener thiab stabilizer hauv cov coatings thiab cov khoom siv tshuaj txhua hnub.
Thickening
HEC qhia tau hais tias muaj zog thickening nyhuv hauv cov tshuaj aqueous, thiab nws cov viscosity nce nrog qhov nce ntawm qhov hnyav molecular. Cov cuab yeej thickening no ua rau nws ua lub luag haujlwm hauv thickening, dej tuav thiab txhim kho kev tsim kho hauv cov dej-raws li cov txheej txheem thiab cov khoom siv hauv tsev.
Rheology
HEC aqueous tov muaj cov khoom tshwj xeeb rheological, thiab nws cov viscosity hloov nrog kev hloov ntawm shear npaum li cas, qhia shear thinning los yog pseudoplasticity. Cov cuab yeej rheological no tso cai rau nws los kho cov dej ntws thiab kev tsim kho hauv cov txheej txheem thiab cov roj av drilling kua.
Emulsification thiab ncua kev kawm ntawv
HEC muaj cov khoom zoo emulsification thiab ncua kev kawm ntawv, uas muaj peev xwm stabilize tshem tawm hais los yog tee dej nyob rau hauv lub dispersion system los tiv thaiv stratification thiab sedimentation. Yog li ntawd, HEC feem ntau siv rau hauv cov khoom xws li emulsion txheej thiab tshuaj ncua kev kawm.
Biodegradability
HEC yog lub ntuj tsim cellulose derivative nrog biodegradability zoo, tsis muaj kuab paug rau ib puag ncig, thiab ua tau raws li cov kev cai ntawm kev tiv thaiv ib puag ncig ntsuab.
IV. Daim ntawv thov teb
Txheej
Nyob rau hauv cov dej-raws li txheej, HEC yog siv los ua cov thickener thiab stabilizer los txhim kho lub fluidity, kev tsim kho thiab kev tiv thaiv sagging ntawm cov txheej txheem.
Kev tsim kho
Hauv cov khoom siv hauv tsev, HEC yog siv hauv cov cement-based mortar thiab putty hmoov los txhim kho kev tsim kho thiab kev tuav dej.
Tshuaj Txhua Hnub
Hauv cov tshuaj ntxuav tes, tshuaj zawv plaub hau, thiab tshuaj txhuam hniav, HEC yog siv los ua cov thickener thiab stabilizer los txhim kho qhov kev xav thiab kev ruaj ntseg ntawm cov khoom.
Cov roj av
Hauv oilfield drilling thiab fracturing kua, HEC yog siv los kho cov rheology thiab ncua kev kawm ntawv ntawm drilling kua thiab txhim kho drilling efficiency thiab kev nyab xeeb.
Papermaking
Nyob rau hauv cov txheej txheem papermaking, HEC yog siv los tswj cov pulp fluidity thiab txhim kho cov uniformity thiab nto ntawm daim ntawv.
Hydroxyethyl cellulose (HEC) tau siv dav hauv ntau qhov chaw lag luam vim nws cov dej solubility zoo heev, thickening, rheological zog, emulsification thiab ncua kev kawm, nrog rau zoo biodegradability. Nws cov txheej txheem ntau lawm yog tus paub tab. Los ntawm cov kauj ruam ntawm cellulose etherification, ntxuav, lub cev qhuav dej, ziab thiab sib tsoo, HEC cov khoom nrog kev ua haujlwm ruaj khov thiab zoo tuaj yeem npaj tau. Nyob rau yav tom ntej, nrog rau kev txhim kho ntawm kev tiv thaiv ib puag ncig thiab kev nce qib ntawm thev naus laus zis, daim ntawv thov kev cia siab ntawm HEC yuav dav dua.
Post lub sij hawm: Jul-02-2024