Polyanionic cellulose (PAC) yog ib qho tshuaj hloov pauv ntawm cov cellulose, uas yog ib txwm tshwm sim polymer pom nyob rau hauv cell phab ntsa ntawm cov nroj tsuag.Cellulose yog tsim los ntawm cov piam thaj rov qab txuas ua ke los ntawm beta-1,4-glycosidic bonds, tsim cov saw ntev.Nws yog ib qho ntawm feem ntau cov organic tebchaw nyob rau hauv lub ntiaj teb thiab ua hauj lwm raws li ib tug qauv nyob rau hauv cov nroj tsuag.Polyanionic cellulose yog synthesized los ntawm cellulose los ntawm ib tug series ntawm cov tshuaj tiv thaiv uas qhia anionic pawg mus rau lub cellulose qaum.Cov pab pawg anionic no muab PAC nws cov khoom tshwj xeeb thiab ua rau nws muaj txiaj ntsig hauv ntau daim ntawv thov kev lag luam.
1.Chemical Structure thiab Synthesis:
Polyanionic cellulose yog tsim los ntawm etherification lossis esterification ntawm cellulose.Thaum lub sij hawm etherification, hydroxyl pawg (-OH) ntawm cov cellulose chains yog hloov nrog ether pawg, feem ntau carboxymethyl (-CH2COOH) los yog carboxyethyl (-CH2CH2COOH) pawg.Cov txheej txheem no qhia txog cov nqi tsis zoo rau hauv cov pob txha cellulose, ua rau nws cov dej-soluble thiab tsis zoo them tag nrho.Qhov degree ntawm kev hloov pauv (DS), uas yog hais txog qhov nruab nrab ntawm cov neeg hloov pauv hydroxyl pawg hauv ib chav tsev piam thaj, tuaj yeem tswj tau los kho cov khoom ntawm PAC rau cov ntawv thov tshwj xeeb.
2.Properties:
Dej Solubility: Ib qho ntawm cov khoom tseem ceeb ntawm PAC yog nws cov dej solubility, uas tshwm sim los ntawm kev qhia ntawm pawg anionic.Qhov kev solubility no ua rau PAC yooj yim los daws thiab koom ua ke rau hauv cov tshuab dej.
Rheological Control: PAC paub txog nws lub peev xwm los hloov kho rheological zog ntawm cov kua.Nws tuaj yeem ua raws li tus neeg sawv cev thickening, txhim kho viscosity thiab tswj cov dej ntws.Cov cuab yeej no muaj txiaj ntsig tshwj xeeb hauv kev lag luam xws li roj drilling, qhov twg PAC yog siv rau hauv cov av nkos kom muaj kev ruaj ntseg zoo thiab tswj cov dej poob.
Pom Kev Tswj: PAC tuaj yeem ua haujlwm raws li tus neeg saib xyuas kev pom, pab tiv thaiv kom tsis txhob poob ntawm cov khib nyiab thaum lub sij hawm pom cov txheej txheem.Cov cuab yeej no muaj txiaj ntsig zoo hauv kev lag luam xws li mining thiab kev kho dej khib nyiab.
pH Stability: PAC nthuav tawm kev ruaj ntseg ntawm ntau qhov pH, uas ua rau nws muaj peev xwm ua tau ntau yam hauv ntau daim ntawv thov.
Compatibility: PAC yog sib xws nrog ntau yam ntawm lwm yam tshuaj thiab additives feem ntau siv nyob rau hauv cov txheej txheem muaj.
3. Daim ntawv thov:
Kev lag luam roj thiab roj: PAC feem ntau siv hauv kev lag luam roj thiab roj, tshwj xeeb hauv cov dej drilling ( av nkos ).Nws ua hauj lwm raws li ib tug viscosifier, kua poob tswj tus neeg saib xyuas, thiab shale inhibitor, pab kom optimize drilling hauj lwm thiab tswj kom zoo kev ncaj ncees.
Kev tsim kho: Hauv kev tsim kho kev lag luam, PAC tau ua haujlwm hauv kev siv cementing los txhim kho cov khoom rheological ntawm cov cement slurries.Nws txhim kho cov twj tso kua mis, txo cov dej poob, thiab txhim kho cov cement bond zog.
Pharmaceuticals: PAC pom cov ntawv thov hauv cov tshuaj formulations raws li ib tug binder nyob rau hauv cov ntsiav tshuaj manufacturing thiab raws li ib tug viscosity modifier nyob rau hauv cov kua formulations.
Khoom noj khoom haus thiab dej haus: Hauv kev lag luam khoom noj khoom haus thiab dej haus, PAC yog siv los ua ib qho stabilizer, thickener, thiab emulsifier hauv ntau yam khoom, nrog rau cov kua ntses, hnav khaub ncaws, thiab cov khoom siv mis nyuj.
Cov Khoom Siv Kho Tus Kheej: PAC tau muab tso rau hauv cov khoom siv tu tus kheej xws li tshuaj zawv plaub hau, tshuaj pleev, thiab tshuaj pleev xim rau nws cov khoom ua kom tuab thiab ruaj khov.
Kev Kho Dej: PAC yog siv rau hauv cov txheej txheem kho dej ua cov flocculant thiab coagulant pab rau tshem tawm cov khib nyiab thiab cov organic teeb meem los ntawm dej.
4. Kev txiav txim siab ib puag ncig:
Thaum PAC muab ntau cov txiaj ntsig hauv kev siv hauv kev lag luam, nws cov khoom siv thiab kev siv yuav ua rau muaj kev txhawj xeeb txog ib puag ncig.Kev hloov tshuaj lom neeg ntawm cellulose los tsim PAC feem ntau suav nrog kev siv cov tshuaj reagents thiab cov txheej txheem siv zog.Tsis tas li ntawd, kev pov tseg ntawm cov khoom uas muaj PAC tuaj yeem ua rau muaj kuab paug ib puag ncig yog tias tsis ua raws li kev tswj hwm pov tseg.Yog li ntawd, kev siv zog tab tom tsim los tsim txoj hauv kev kom ruaj khov ntxiv rau kev sib txuas ntawm PAC thiab txhawb kev rov ua dua lossis biodegradation ntawm PAC-raws li cov khoom.
Qhov kev thov rau polyanionic cellulose yuav tsum tau loj hlob mus ntxiv thoob plaws ntau yam kev lag luam vim nws cov khoom siv ntau yam thiab ntau yam kev siv.Kev tshawb fawb tau tsom mus rau kev txhim kho kev ua tau zoo thiab kev ruaj khov ntawm PAC, tshawb nrhiav cov kev sib txuas tshiab, thiab tsim cov kev hloov hauv eco-friendly.Tsis tas li ntawd, muaj kev txaus siab ntxiv rau kev siv PAC hauv thaj chaw tshiab xws li biomedicine thiab lub zog tauj dua tshiab.Zuag qhia tag nrho, polyanionic cellulose tseem yog ib qho tseem ceeb thiab tseem ceeb ntawm cov khoom siv polymer hauv cov txheej txheem kev lag luam niaj hnub no, nrog rau kev nce qib ntxiv txhawm rau txhawm rau ua kom nws cov txiaj ntsig zoo thaum txo qis nws ib puag ncig hneev taw.
polyanionic cellulose (PAC) yog ib qho tshuaj hloov pauv ntawm cov cellulose nrog cov khoom tshwj xeeb uas ua rau nws muaj txiaj ntsig hauv ntau hom kev lag luam.Los ntawm kev txhim kho cov kua dej hauv cov roj drilling kom txhim kho kev ua tau zoo ntawm cov tshuaj formulations, PAC plays lub luag haujlwm tseem ceeb hauv ntau cov haujlwm.Txawm li cas los xij, zoo li txhua yam khoom siv tshuaj, nws yog ib qho tseem ceeb uas yuav tsum xav txog qhov cuam tshuam ib puag ncig ntawm PAC ntau lawm thiab kev siv thiab ua haujlwm rau kev daws teeb meem.Txawm hais tias muaj kev sib tw, kev tshawb fawb tsis tu ncua thiab kev tsim kho tshiab txuas ntxiv nthuav dav lub peev xwm thiab kev siv ntawm polyanionic cellulose, ua kom nws muaj feem cuam tshuam rau ntau yam kev lag luam rau xyoo tom ntej.
Post lub sij hawm: Mar-28-2024