Hydroxypropylmethylcellulose (HPMC) yog cellulose ether muab tau los ntawm tej yam ntuj tso xws li ntoo pulp thiab paj rwb linters. Vim nws cov khoom tshwj xeeb, nrog rau cov dej solubility, thickening peev xwm, zaj duab xis-forming zog, thiab lwm yam, nws yog dav siv nyob rau hauv ntau yam lag luam. Ib qho tseem ceeb uas yuav tsum tau xav txog thaum siv HPMC yog nws cov viscosity, uas tuaj yeem cuam tshuam rau nws qhov kev ua tau zoo hauv ntau qhov chaw siv. Hauv tsab xov xwm no, peb tham txog vim li cas cellulose HPMC nrog cov viscosities sib txawv yuav tsum raug xaiv rau qhov chaw siv sib txawv, thiab qhov tseeb viscosity tuaj yeem pab txhim kho HPMC kev ua tau zoo.
Viscosity yog ib qho kev ntsuas ntawm cov kua dej tsis kam ntws thiab yog qhov tseem ceeb rau kev txiav txim siab thaum tsim cov khoom lag luam uas xav tau cov yam ntxwv tshwj xeeb. Viscosity cuam tshuam rau kev ua haujlwm ntawm HPMC vim tias nws txiav txim siab nws lub peev xwm los tsim cov gels, cuam tshuam rau pH ntawm cov tshuaj, lub thickness ntawm txheej, thiab lwm yam khoom ntawm lub cev. HPMC muaj nyob rau hauv ntau qib viscosity, feem ntau hom yog tsawg viscosity (LV), nruab nrab viscosity (MV) thiab siab viscosity (HV). Txhua hom no muaj lub hom phiaj tshwj xeeb thiab tsim nyog rau ib puag ncig tshwj xeeb.
Tsawg viscosity (LV) HPMC
Tsawg viscosity HPMC muaj qhov hnyav molecular thiab yooj yim soluble hauv dej. Nws yog hom HPMC ntau tshaj plaws thiab siv ntau yam kev lag luam xws li zaub mov, tshuaj pleev ib ce, kev tsim kho thiab tshuaj. LV HPMC yog qhov zoo tshaj plaws rau cov ntawv thov uas xav tau qis rau nruab nrab viscosity daws xws li cov gels ntshiab, emulsions thiab xim. LV HPMC kuj tseem siv tau los txuas ntxiv lub neej txee ntawm cov khoom noj, txo cov syneresis thiab muab kev ntxhib los mos.
LV HPMC kuj nquag siv hauv kev tsim kho kev lag luam los txhim kho kev ua haujlwm ntawm cov khoom siv cement xws li mortars, grouts thiab pobzeb adhesives. Nws pab txo qis dej hauv cov cement sib tov, tiv thaiv kev tawg, thiab ntxiv dag zog rau kev sib raug zoo ntawm cov ntaub ntawv. LV HPMC kuj tseem siv los ua kom muaj zog thiab ua haujlwm ntev ntawm plaster, stucco thiab lwm yam khoom siv.
Medium Viscosity (MV) HPMC
Nruab nrab viscosity HPMC muaj qhov hnyav dua molecular dua li LV HPMC thiab tsis yooj yim soluble hauv dej. Nws feem ntau yog siv rau hauv daim ntawv thov uas xav tau ntau cov kev daws teeb meem xws li coatings, varnishes thiab inks. MV HPMC muaj kev tswj xyuas zoo dua thiab siv cov khoom zoo dua li LV HPMC, uas ua rau cov yeeb yaj kiab tsis sib xws thiab zoo ib yam. MV HPMC kuj tseem siv tau ntau dua pH ntau dua, muab ntau yam ntxiv rau ntau yam kev siv.
MV HPMC kuj tau siv dav hauv cov khoom siv tshuaj, xws li cov tshuaj tiv thaiv tso tawm, vim nws ncua kev sib cais thiab yog li ncua kev tso tawm ntawm cov khoom xyaw nquag.
High Viscosity (HV) HPMC
High viscosity HPMC muaj qhov hnyav tshaj plaws molecular ntawm tag nrho peb qib thiab yog cov dej soluble tsawg tshaj plaws. Nws feem ntau yog siv rau hauv daim ntawv thov uas yuav tsum tau thickening thiab stabilizing zog, xws li kua ntses, cream thiab gels. HV HPMC pab txhim kho kev ntxhib los mos thiab viscosity ntawm cov khoom, muab kev paub zoo dua rau cov neeg siv khoom. Nws kuj tuaj yeem siv los ua kom ruaj khov emulsions, tiv thaiv kev teeb tsa thiab txuas lub neej txee. Tsis tas li ntawd, HV HPMC feem ntau siv hauv kev lag luam ntawv los txhim kho daim ntawv lub zog thiab kev luam tawm.
nyob rau hauv xaus
Qhov tseeb viscosity ntawm HPMC yog qhov tseem ceeb rau kev txhim kho nws cov kev ua tau zoo nyob rau hauv ntau qhov chaw siv. LV HPMC yog qhov zoo tshaj plaws rau cov ntawv thov uas xav tau cov kev daws teeb meem qis rau nruab nrab, thaum MV HPMC yog qhov tsim nyog rau cov kev daws teeb meem xws li cov xim pleev xim, cov kua roj vanish thiab inks. Thaum kawg, HV HPMC yog qhov tsim nyog rau daim ntawv thov uas yuav tsum tau ua kom tuab thiab ruaj khov xws li qab zib, gels thiab kua ntses. Xaiv qhov viscosity kom raug tuaj yeem pab txhim kho tag nrho cov kev ua tau zoo ntawm HPMC thiab ua kom nws haum rau ntau daim ntawv thov.
Post lub sij hawm: Aug-31-2023