Hydroxypropyl Methylcellulose (HPMC) yog ib qho uas tsis yog-ionic cellulose ether siv dav hauv cov khoom siv hauv tsev, tshwj xeeb tshaj yog nyob rau hauv mortars qhuav, adhesives thiab coatings. Lub viscosity ntawm HPMC yog ib qho ntawm nws qhov kev ua tau zoo tseem ceeb hauv kev tsim kho thiab muaj kev cuam tshuam tseem ceeb rau kev ua haujlwm, dej tuav thiab cov khoom siv kho tshuab.
Kev sib raug zoo ntawm viscosity ntawm hydroxypropyl methylcellulose thiab cov khoom formula
Ua haujlwm tau
Lub viscosity ntawm HPMC ua lub luag haujlwm tseem ceeb hauv kev ua haujlwm ntawm cov khoom siv hauv tsev. High viscosity HPMC tuaj yeem txhim kho qhov sib xws thiab cov khoom siv rheological ntawm cov khoom, ua rau nws ua tau zoo dua rau cov substrate thiab txo qis sagging thaum siv. Piv txwv li, nyob rau hauv ceramic pobzeb adhesives, kev siv high-viscosity HPMC tuaj yeem ua rau nws yooj yim dua rau cov kua nplaum los ua cov txheej txheej ntawm cov vuas ceramic thiab cov substrate, yog li txhim kho kev tsim kho thiab kev sib txuas zoo.
Txawm li cas los xij, qhov viscosity siab dhau yuav ua rau daim ntawv thov nyuaj dua, vim tias cov khoom siv viscosity siab yuav nyuaj dua rau do thiab sib kis. Yog li ntawd, nws yog ib qho tsim nyog yuav tsum nrhiav kev sib npaug ntawm viscosity thiab kev ua haujlwm kom ntseeg tau tias cov khoom muaj kev ua haujlwm zoo thiab tuaj yeem ua tau raws li kev xav tau ntawm engineering.
Kev tuav dej
Cov dej tuav cov khoom ntawm HPMC yog qhov tseem ceeb rau cov txheej txheem hardening ntawm cov khoom siv hauv tsev. High viscosity HPMC muaj peev xwm khaws cov dej muaj zog thiab tuaj yeem khaws cov dej noo hauv cov khoom rau lub sijhawm ntev tom qab kev tsim kho. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog rau cov khoom siv cement, vim tias cov dej noo txaus tuaj yeem txhawb nqa cov tshuaj tiv thaiv dej ntawm cov cement thiab txhim kho lub zog thiab kav ntev ntawm cov khoom tawv.
Nyob rau hauv cov ntaub ntawv gypsum, siab viscosity HPMC kuj pab tiv thaiv kom tsis txhob ya raws ntau dhau thaum lub sij hawm tsim kho, yog li tsis txhob tawg thiab shrinkage teeb meem. Feem ntau hais lus, HPMC nrog cov viscosity siab dua muaj qhov pom tseeb zoo hauv kev txhim kho cov dej tuav thiab tsim nyog rau cov ntawv thov uas xav tau kev tswj dej ntau dua.
Anti-sag thiab anti-plam zog
Nyob rau hauv cov ntaub ntawv txheej phab ntsa thiab cov nplais nplaum, cov viscosity ntawm HPMC kuj tseem muaj feem cuam tshuam rau sag resistance thiab slip resistance. High viscosity HPMC tuaj yeem ua kom cov thixotropy ntawm cov khoom siv tau zoo, ua rau nws nthuav tawm cov viscosity ntau dua hauv lub xeev zoo li qub, yog li txo qhov ntws ntawm cov khoom ntawm qhov chaw ntsug. Cov cuab yeej no yog qhov tseem ceeb rau kev tswj xyuas qhov ruaj khov ntawm cov txheej txheej lossis cov vuas rau ntawm qhov chaw ntsug, pab txhim kho qhov zoo thiab kev ua haujlwm ntawm kev tsim kho.
Cua encapsulation thiab daim ntawv cog lus muaj zog
Lub viscosity ntawm HPMC kuj cuam tshuam rau cov huab cua nkag hauv cov khoom thiab nws qhov kawg ntawm daim ntawv cog lus. High-viscosity HPMC tuaj yeem ua rau cov huab cua ntau ntxiv hauv cov khoom, yog li txhim kho cov khoom ntim ruaj khov thiab thermal rwb thaiv tsev. Txawm li cas los xij, cov ntsiab lus huab cua siab dhau tuaj yeem txo qhov ntom ntawm cov khoom, yog li cuam tshuam rau nws txoj kev sib raug zoo. Yog li ntawd, thaum xaiv HPMC, nws yog ib qho tsim nyog yuav tsum tau ua tib zoo xav txog qhov cuam tshuam ntawm nws cov viscosity ntawm cov yam ntxwv ntawm cov khoom kom ntseeg tau tias cov khoom muaj kev ua haujlwm zoo thiab tuaj yeem ua tau raws li qhov kawg ntawm kev ua haujlwm.
Optimization thiab kev xaiv hauv kev siv tswv yim
Hauv kev siv tswv yim, cov tuam txhab tsim khoom siv feem ntau ua kom zoo dua qhov kev siv nyiaj thiab viscosity ntawm HPMC los ntawm kev sim thiab kev paub dhau los kom tau raws li qhov xav tau ntawm cov ntawv thov tshwj xeeb. Tshwj xeeb, cov xwm txheej ntawm daim ntawv thov sib txawv yuav muaj qhov sib txawv rau HPMC viscosity. Piv txwv li, hauv cov nplais nplaum, cov viscosity HPMC feem ntau yog siv los txhim kho kev ua haujlwm tsis zoo, thaum nyob rau hauv plastering mortar, nruab nrab-viscosity HPMC yuav raug xaiv los coj mus rau hauv tus account ob qho tib si ua haujlwm thiab tuav dej.
Cov tsis xws li molecular hnyav faib, degree ntawm kev hloov pauv (DS) thiab molar degree ntawm hloov pauv (MS) ntawm HPMC tseem yuav cuam tshuam rau nws cov viscosity thiab kev ua haujlwm. Yog li ntawd, thaum xaiv HPMC, tsis yog tsuas yog viscosity yuav tsum raug txiav txim siab, tab sis nws cov khoom siv tshuaj lom neeg kuj tseem yuav tsum tau txiav txim siab kom paub meej tias nws qhov kev ua tau zoo hauv cov khoom siv hauv tsev.
Lub viscosity ntawm hydroxypropyl methylcellulose muaj qhov cuam tshuam loj rau nws qhov kev ua tau zoo hauv cov khoom siv hauv tsev. Los ntawm kev xaiv thiab ua kom zoo dua qhov viscosity ntawm HPMC, cov khoom siv ua haujlwm tau zoo, dej tuav, sag tsis kam thiab huab cua encapsulation muaj peev xwm tuaj yeem txhim kho, yog li txhim kho tag nrho kev ua haujlwm thiab kev tsim kho ntawm cov khoom siv hauv tsev. Hauv kev siv cov tswv yim, HPMC nrog cov viscosity tsim nyog yuav tsum tau xaiv raws li cov khoom siv tshwj xeeb thiab kev tsim kho kom ua tiav qhov kev tsim kho zoo tshaj plaws thiab ua haujlwm ntev. Qhov no tsis tsuas yog yuav tsum muaj kev nkag siab tob txog cov tshuaj lom neeg thiab lub cev ntawm HPMC, tab sis kuj yuav tsum muaj kev sib xyaw ua ke ntawm cov kev paub dhau los thiab cov ntaub ntawv xeem hauv kev ua haujlwm tiag tiag los xyuas kom meej qhov kev ua tau zoo ntawm cov khoom siv.
Post lub sij hawm: Lub Xya hli ntuj-10-2024