Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv polymer uas siv dav hauv ntau yam lag luam nrog rau kev tsim kho. Hauv cov txheej txheem putty, HPMC ua haujlwm ntau yam, suav nrog kev txhim kho kev ua haujlwm, txhim kho adhesion, tswj dej tuav, thiab txhim kho cov khoom siv kho kom zoo.
Putty formulations ua lub luag haujlwm tseem ceeb hauv kev tsim kho raws li cov khoom siv ntau yam uas ua rau qhov khoob, smooths qhov chaw, thiab muab lub hauv paus rau cov xim thiab txheej. Hydroxypropyl methylcellulose (HPMC) yog ib qho ntawm cov khoom xyaw tseem ceeb uas siv hauv cov txheej txheem putty vim nws cov khoom tshwj xeeb thiab ntau yam.
1.HPMC tshuaj muaj zog
Hydroxypropylmethylcellulose yog ib tug semi-synthetic polymer muab tau los ntawm cellulose. Nws yog tus cwj pwm los ntawm nws cov qauv tshwj xeeb, suav nrog cellulose chains txuas rau hydroxypropyl thiab methyl pawg. Qib ntawm kev hloov pauv ntawm cov pab pawg no txiav txim siab cov yam ntxwv ntawm HPMC, suav nrog kev solubility, viscosity thiab muaj peev xwm tsim cov yeeb yaj kiab. Feem ntau, HPMC siv nyob rau hauv putty formulations muaj nyob rau hauv nruab nrab mus rau high viscosity qib uas muab cov khoom uas yuav tsum tau rheological.
2. Lub mechanism ntawm kev txiav txim ntawm putty formula
Txhim kho kev ua haujlwm
HPMC ua raws li lub thickener thiab rheology hloov kho los txhim kho kev ua hauj lwm ntawm putty formulations. Lub polymer molecules entangle thiab tsim ib tug peb-dimensional network, uas imparts viscosity thiab tiv thaiv cov khoom hais los ntawm settling. Qhov no ua kom muaj kev faib tawm thiab yooj yim daim ntawv thov ntawm putty, tso cai rau nws mus rau kis thiab zoo li smoothly tsis dhau sagging los yog dripping.
Txhim kho adhesion
Adhesion yog ib qho cuab yeej tseem ceeb hauv cov txheej txheem putty raws li nws txiav txim siab lub zog ntawm daim ntawv cog lus ntawm putty thiab substrate. HPMC txhim kho adhesion los ntawm kev ua ib zaj duab xis nyias ntawm lub substrate nto, txhawb cov neeg kho tshuab interlocking thiab ua rau thaj chaw sib cuag ntawm putty thiab substrate. Tsis tas li ntawd, qhov hydrophilic xwm ntawm HPMC tso cai rau nws cuam tshuam nrog putty matrices thiab substrates, txhawb nqa adhesion txawm nyob rau ntawm qhov nyuaj.
tswj tuav dej
Kev tuav dej yog qhov tseem ceeb rau kev kho kom zoo thiab ziab ntawm putty formulations. HPMC ua raws li cov dej khaws cia los ntawm kev nqus thiab khaws cov dej noo hauv nws cov qauv molecular. Qhov no tiv thaiv cov evaporation sai ntawm cov dej los ntawm putty matrix, ua kom lub sijhawm ua haujlwm ntev thiab ua tiav cov dej txaus ntawm cov khoom xyaw cementitious. Kev tswj dej tuav kuj tseem txo qis qis thiab tawg thaum lub sij hawm ziab, txhim kho durability thiab nto tiav.
Mechanical kev ua tau zoo optimization
HPMC txhim kho cov cuab yeej cuab tam ntawm putty formulations los ntawm kev txhawb nqa cov matrix thiab txhim kho cohesion. Lub polymer tsim hydrogen bonds nrog lwm cov khoom xyaw hauv lub putty, ua rau nws lub zog, yoog raws thiab cuam tshuam. Tsis tas li ntawd, HPMC lub peev xwm tsim cov yeeb yaj kiab tsim ib qho kev tiv thaiv uas tiv thaiv cov putty los ntawm kev ntxhov siab sab nraud thiab ib puag ncig, ntxiv rau nws cov kav ntev thiab ntev.
3.Qhov cuam tshuam ntawm HPMC ntawm kev ua haujlwm ntawm putty
Rheological zog
HPMC cuam tshuam rau tus cwj pwm rheological ntawm putty formulations, cuam tshuam viscosity, thixotropy thiab ntws zog. Polymer concentration, molecular yuag thiab degree ntawm kev hloov pauv txiav txim siab qhov kev hloov kho viscosity, tso cai rau cov kws tsim qauv tsim cov khoom siv rheological rau cov ntawv thov tshwj xeeb. Kev hloov kho ntawm HPMC ntau npaum li cas ua kom pom kev tsim kho thiab kev ua haujlwm ntawm daim ntawv thov.
adhesion
Lub xub ntiag ntawm HPMC txhim kho lub zog ntawm cov txheej txheem putty, ua rau txhim kho adhesion rau ntau yam substrates xws li pob zeb, ntoo, hlau thiab masonry. Formulators tuaj yeem kho HPMC qib thiab qhov siab kom ua tiav cov khoom sib txuas uas xav tau, ua kom muaj kev sib raug zoo nrog cov ntaub ntawv sib txawv thiab ib puag ncig. Kev npaj kom zoo thiab kev siv cov txheej txheem tuaj yeem ua tiav cov txiaj ntsig kev txhawb nqa ntawm HPMC kom ua kom muaj zog ntawm daim ntawv cog lus thiab kev ua haujlwm ntev.
dej rebels
HPMC pab txhim kho cov dej tsis kam ntawm putty formulations los ntawm kev tswj cov dej tuav thiab txo cov dej permeability. Cov polymer ua ib zaj duab xis hydrophilic uas inhibits dej nkag mus rau hauv putty matrix, tiv thaiv o, degradation thiab poob ntawm txhua yam khoom. Kev xaiv HPMC qib thiab cov khoom siv ntxiv tuaj yeem txhim kho cov dej tsis kam, ua rau cov khoom siv hauv tsev thiab sab nraum zoov uas muaj dej noo.
4. Mechanical zog thiab durability
Kev koom ua ke HPMC rau hauv cov txheej txheem putty ua rau cov neeg kho tshuab muaj zog, ruaj khov, thiab tsis kam tawg, shrinkage, thiab huab cua. Lub polymer ua raws li tus neeg sawv cev txhawb zog, ntxiv dag zog rau putty matrix thiab txhim kho cohesion. Tsis tas li ntawd, HPMC lub peev xwm los tswj cov dej tuav thiab txhawb kev kho kom zoo pab txhim kho kev sib raug zoo thiab kev ua haujlwm ntev. Formulators tuaj yeem ua kom zoo dua HPMC ntau npaum li cas thiab cov qauv tsim kom ua tiav qhov zoo tshaj plaws ntawm kev sib npaug ntawm cov khoom siv dag zog thiab kav ntev.
5. Kev xav txog kev tsim qauv
Xaiv cov qib HPMC
Thaum xaiv cov qib HPMC uas tsim nyog rau cov txheej txheem putty, cov neeg tsim khoom yuav tsum xav txog ntau yam, suav nrog viscosity, qib ntawm kev hloov pauv, thiab kev sib raug zoo nrog lwm cov khoom xyaw. Cov qib viscosity siab dua yog tsim rau cov tuab tuab thiab cov ntaub ntawv ntsug, thaum cov qib viscosity qis dua yog tsim rau smoother textures thiab yooj yim dua. Formulators yuav tsum tau ua kom paub tseeb tias kev sib raug zoo ntawm HPMC thiab lwm yam additives xws li fillers, pigments, thiab preservatives kom tsis txhob muaj teeb meem compatibility thiab kev ua hauj lwm degradation.
koob tshuaj optimization
Qhov txiaj ntsig zoo ntawm HPMC nyob ntawm cov yam ntxwv xws li cov khoom xav tau, daim ntawv thov txheej txheem, hom substrate thiab ib puag ncig. Formulators yuav tsum ua qhov kev ntsuam xyuas kom zoo los txiav txim siab qhov qis tshaj koob tshuaj uas ua tiav qhov kev xav tau yam tsis muaj kev cuam tshuam tus nqi-zoo. Kev siv ntau dhau ntawm HPMC tuaj yeem ua rau muaj viscosity ntau dhau, teeb meem ntawm daim ntawv thov, thiab lub sijhawm ziab kom ntev, thaum tsis siv yuav ua rau muaj kev tswj xyuas tsis txaus thiab txo kev ua haujlwm.
6. Compatibility nrog lwm yam additives
HPMC cuam tshuam nrog ntau yam additives uas feem ntau siv hauv cov tshuaj putty, xws li thickeners, dispersants thiab preservatives. Cov neeg tsim qauv yuav tsum ua tib zoo tshuaj xyuas qhov sib xyaw ua ke thiab kev sib koom ua ke ntawm HPMC nrog rau lwm cov khoom xyaw kom ntseeg tau tias kev ua tau zoo thiab ruaj khov. Kev ntsuam xyuas kev sib raug zoo, suav nrog kev txheeb xyuas rheological thiab kev ntsuas kev cia ntev ntev, pab txheeb xyuas qhov muaj peev xwm sib cuam tshuam lossis tsim teeb meem thaum ntxov hauv txoj kev txhim kho kom hloov kho thiab ua kom zoo dua qub.
7. Kev siv tshuab
Cov txheej txheem kev thov kom raug yog qhov tseem ceeb rau kev ua kom tau zoo tshaj plaws ntawm putty formulations uas muaj HPMC. Formulators yuav tsum tau muab cov lus qhia meej thiab cov lus qhia rau kev npaj nto, sib tov, thov thiab kho kom zoo kom zoo. Yuav kom ua tiav qhov xav tau adhesion, smoothness thiab durability, cov tswv yim xws li priming, substrate conditioning thiab multi-layer coatings yuav tsum tau. Kev cob qhia thiab kev kawm ntawm cov neeg ua haujlwm tsim kho ntxiv ua kom zoo ib yam, cov txiaj ntsig zoo, txo qis kev rov ua haujlwm dua thiab cov teeb meem lav.
Post lub sij hawm: Feb-22-2024