Cov txheej txheem tsim khoom thiab kev ua tau zoo ntawm hydroxyethyl cellulose (HEC)

I. Kev Taw Qhia

Hydroxyethyl Cellulose (HEC) yog ib qho polymer uas tsis yog ionic uas yaj tau hauv dej uas siv dav hauv kev rho tawm roj, txheej, kev tsim kho, tshuaj txhua hnub, kev ua ntawv thiab lwm yam. HEC tau los ntawm kev hloov kho tshuaj ntawm cellulose, thiab nws cov khoom thiab kev siv feem ntau yog txiav txim siab los ntawm cov hydroxyethyl substituents ntawm cov cellulose molecules.

II. Cov txheej txheem tsim khoom

Cov txheej txheem tsim khoom ntawm HEC feem ntau suav nrog cov kauj ruam hauv qab no: cellulose etherification, ntxuav, dehydration, ziab thiab sib tsoo. Cov hauv qab no yog cov lus qhia ntxaws ntxaws rau txhua kauj ruam:

Kev sib xyaw ua ke ntawm cellulose

Cellulose raug kho nrog alkali ua ntej kom tsim tau alkali cellulose (Cellulose Alkali). Cov txheej txheem no feem ntau yog ua tiav hauv lub reactor, siv cov kua sodium hydroxide los kho cov cellulose ntuj kom tsim tau alkali cellulose. Cov tshuaj tiv thaiv 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 ua tiav hauv qab siab, feem ntau yog 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

Qhov kev tshuaj tiv thaiv no xav tau kev tswj hwm qhov kub thiab txias, siab thiab qhov ntau ntawm ethylene oxide ntxiv kom ntseeg tau tias cov khoom sib xws thiab zoo.

Ntxuav

Cov HEC nyoos feem ntau muaj cov alkali tsis tau ua haujlwm, ethylene oxide thiab lwm yam khoom siv, uas yuav tsum tau muab tshem tawm los ntawm ntau qhov dej ntxuav lossis cov organic solvent ntxuav. Yuav tsum tau siv dej ntau thaum lub sijhawm ntxuav dej, thiab cov dej khib nyiab tom qab ntxuav yuav tsum tau kho thiab tso tawm.

Kev qhuav dej

Cov HEC ntub tom qab ntxuav yuav tsum tau qhuav dej, feem ntau los ntawm kev lim dej nqus tsev lossis kev sib cais centrifugal kom txo cov dej noo.

Kev ziab

Cov HEC uas qhuav lawm yuav tsum tau ziab, feem ntau yog siv tshuaj tsuag ziab lossis ziab sai sai. Qhov kub thiab lub sijhawm yuav tsum tau tswj hwm kom nruj thaum lub sijhawm ziab kom tsis txhob muaj kev puas tsuaj lossis sib sau ua ke ntawm qhov kub siab.

Kev sib tsoo

Lub HEC block qhuav yuav tsum tau zom thiab sieved kom ua tiav qhov sib npaug ntawm cov khoom me me, thiab thaum kawg tsim cov hmoov lossis cov khoom granular.

III. Cov yam ntxwv ntawm kev ua tau zoo

Kev yaj dej

HEC muaj cov dej solubility zoo thiab tuaj yeem yaj sai sai hauv dej txias thiab dej kub los ua cov kua pob tshab lossis pob tshab. Cov khoom solubility no ua rau nws siv dav ua cov khoom siv tuab thiab stabilizer hauv cov txheej thiab cov khoom siv tshuaj txhua hnub.

Ua kom tuab

HEC qhia tau tias muaj zog ua kom tuab hauv cov kua dej, thiab nws cov viscosity nce ntxiv nrog rau qhov hnyav ntawm molecular. Cov khoom ua kom tuab no ua rau nws ua lub luag haujlwm hauv kev ua kom tuab, khaws dej thiab txhim kho kev ua haujlwm ntawm cov txheej txheem dej thiab cov mortars hauv tsev.

Kev hloov pauv

HEC aqueous kua muaj cov khoom rheological tshwj xeeb, thiab nws cov viscosity hloov pauv nrog qhov kev hloov pauv ntawm shear tus nqi, qhia txog shear thinning lossis pseudoplasticity. Cov khoom rheological no ua rau nws tuaj yeem kho qhov fluidity thiab kev ua haujlwm tsim kho hauv cov txheej txheem thiab cov kua dej drilling oilfield.

Emulsification thiab kev ncua

HEC muaj cov khoom zoo emulsification thiab suspension, uas tuaj yeem tswj cov khoom me me lossis cov tee dej hauv lub dispersion system kom tiv thaiv stratification thiab sedimentation. Yog li ntawd, HEC feem ntau siv rau hauv cov khoom xws li emulsion coatings thiab tshuaj suspensions.

Kev puas tsuaj ntawm cov tsiaj txhu

HEC yog ib qho cellulose derivative ntuj nrog biodegradability zoo, tsis muaj kuab paug rau ib puag ncig, thiab ua tau raws li qhov yuav tsum tau ua ntawm kev tiv thaiv ib puag ncig ntsuab.

IV. Cov teb thov

Cov txheej txheem

Hauv cov txheej txheem dej, HEC yog siv los ua cov khoom tuab thiab stabilizer los txhim kho qhov fluidity, kev ua haujlwm tsim kho thiab cov khoom tiv thaiv kev sagging ntawm cov txheej txheem.

Kev Tsim Kho

Hauv cov ntaub ntawv siv hauv tsev, HEC siv rau hauv cov cement-based mortar thiab putty hmoov los txhim kho kev ua haujlwm thiab kev khaws dej.

Cov Tshuaj Txhua Hnub

Hauv cov tshuaj ntxuav tes, tshuaj zawv plaub hau, thiab tshuaj txhuam hniav, HEC yog siv los ua cov khoom tuab thiab stabilizer los txhim kho qhov kev xav thiab kev ruaj khov ntawm cov khoom. 

Cov chaw roj av

Hauv cov roj drilling thiab fracturing kua, HEC yog siv los kho cov rheology thiab suspension cov khoom ntawm drilling kua thiab txhim kho drilling efficiency thiab kev nyab xeeb.

Kev ua ntawv

Hauv cov txheej txheem ua ntawv, HEC siv los tswj cov kua txiv hmab txiv ntoo thiab txhim kho qhov sib npaug thiab cov khoom 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 suspension zog, nrog rau biodegradability zoo. Nws cov txheej txheem ntau lawm yog qhov paub tab. Los ntawm cov kauj ruam ntawm cellulose etherification, ntxuav, dehydration, ziab thiab sib tsoo, HEC cov khoom nrog kev ua haujlwm ruaj khov thiab zoo zoo tuaj yeem npaj tau. Yav tom ntej, nrog kev txhim kho ntawm cov kev cai tiv thaiv ib puag ncig thiab kev nce qib ntawm thev naus laus zis, daim ntawv thov ntawm HEC yuav dav dua.