Polyanionic Cellulose (PAC) thiab Sodium Carboxymethyl Cellulose (CMC)

Polyanionic cellulose (PAC) thiab sodium carboxymethyl cellulose (CMC) yog ob qho tib si cellulose derivatives dav siv nyob rau hauv ntau yam lag luam rau lawv thickening, stabilizing, thiab rheological zog. Thaum lawv qhia qee qhov zoo sib xws, lawv kuj muaj qhov sib txawv ntawm cov qauv tshuaj, khoom siv, thiab kev siv. Nov yog qhov sib piv ntawm PAC thiab CMC:

1. Chemical Structure:
   • PAC: Polyanionic cellulose yog cov dej-soluble polymer muab tau los ntawm cellulose los ntawm kev qhia txog carboxymethyl thiab lwm pab pawg anionic mus rau cellulose qaum. Nws muaj ntau pawg carboxyl (-COO-) raws cov saw cellulose, ua rau nws muaj anionic heev.
   • CMC: Sodium carboxymethyl cellulose kuj yog cov dej-soluble polymer muab los ntawm cellulose, tab sis nws dhau los ua cov txheej txheem carboxymethylation, uas ua rau kev hloov ntawm hydroxyl pawg (-OH) nrog cov carboxymethyl pawg (-CH2COONa). CMC feem ntau muaj tsawg dua carboxyl pawg piv rau PAC.
2. Ionic xwm:
   • PAC: Polyanionic cellulose yog cov anionic heev vim muaj ntau pawg carboxyl raws cov saw cellulose. Nws nthuav tawm cov khoom muaj zog ion-pauv pauv thiab feem ntau yog siv los ua tus neeg saib xyuas kev pom thiab kev hloov kho rheology hauv cov dej hauv cov dej drilling.
   • CMC: Sodium carboxymethyl cellulose kuj yog anionic, tab sis nws cov qib ntawm anionicity nyob ntawm qhov kev hloov pauv (DS) ntawm pawg carboxymethyl. CMC feem ntau yog siv los ua cov thickener, stabilizer, thiab viscosity modifier hauv ntau daim ntawv thov, suav nrog zaub mov, tshuaj, thiab cov khoom tu tus kheej.
3. Viscosity thiab Rheology:
   • PAC: Polyanionic cellulose nthuav tawm siab viscosity thiab shear-thinning tus cwj pwm hauv kev daws teeb meem, ua rau nws siv tau zoo li cov thickener thiab rheology hloov kho hauv cov kua dej drilling thiab lwm yam kev siv. PAC tuaj yeem tiv taus qhov kub thiab txias thiab qib salinity ntsib hauv kev ua haujlwm roj.
   • CMC: Sodium carboxymethyl cellulose kuj nthuav tawm viscosity thiab rheology hloov kho cov khoom, tab sis nws cov viscosity feem ntau qis dua piv rau PAC. CMC cov ntaub ntawv ruaj khov thiab cov kev daws teeb meem pseudoplastic, ua rau nws tsim nyog rau ntau yam kev siv, suav nrog zaub mov, tshuaj pleev ib ce, thiab tshuaj.
4. Daim ntawv thov:
   • PAC: Polyanionic cellulose feem ntau yog siv nyob rau hauv cov roj thiab roj kev lag luam raws li ib tug pom kev tswj tus neeg saib xyuas, rheology modifier, thiab kua poob reducer nyob rau hauv drilling kua. Nws kuj yog siv rau hauv lwm cov ntawv thov xws li cov ntaub ntawv tsim kho thiab kev kho ib puag ncig.
   • CMC: Sodium carboxymethyl cellulose muaj ntau daim ntawv thov nyob rau hauv ntau yam lag luam, nrog rau cov zaub mov thiab dej haus (raws li ib tug thickener thiab stabilizer), tshuaj (raws li ib tug binder thiab disintegrant), cov khoom tu tus kheej (raws li ib tug rheology modifier), textiles (raws li ib tug sizing agent) , thiab ntawv tsim khoom (raws li daim ntawv additive).

Thaum ob qho tib si polyanionic cellulose (PAC) thiab sodium carboxymethyl cellulose (CMC) yog cellulose derivatives nrog cov khoom anionic thiab cov ntawv zoo sib xws hauv qee qhov kev lag luam, lawv muaj qhov sib txawv ntawm cov qauv tshuaj, cov khoom, thiab cov ntawv thov tshwj xeeb. PAC feem ntau yog siv hauv kev lag luam roj thiab roj, thaum CMC pom dav siv hauv cov khoom noj, tshuaj, kev tu tus kheej, textiles, thiab lwm yam lag luam.