HydroxyPropyyl methylcellose (HPMC) yog ib qho ntxiv thiab dav siv ntxiv rau hauv kev tsim kho kev tsim kho, feem ntau rau nws lub luag haujlwm hauv kev txhim kho kev ua haujlwm thiab kev siv tshuaj. Lub cellulose ether derivative yog muaj nuj nqis rau nws cov txiaj ntsig txiaj ntsig, txhim kho cov khoom siv ua haujlwm, txhim kho cov khoom sib xyaw, thiab txhim kho cov khoom siv tshuab ntau yam.
1. Dej khaws cia
Ib qho ntawm cov txiaj ntsig tseem ceeb ntawm HPMC hauv kev tsim kho yog nws lub peev xwm ua kom muaj peev xwm. Cov xeeb ceem no yog qhov tseem ceeb heev rau ntau yam:
Kev kho cov txheej txheem: Cov khoom siv kom huv ntawm cov ntaub ntawv caas-raws li, xws li Mortars thiab pob zeb ua kom zoo thiab muaj zog. HPMC qeeb qeeb hauv cov dej evaporation, kom ua tiav cov txheej txheem hydration ntau dua. Qhov no ncua sij hawm kho lub sijhawm ua rau tsawg dua cov kab nrib pleb thiab txhim kho lub zog.
Kev sib xws: Kev tswj cov dej noo ib txwm muaj nyob hauv cov khoom pab tiv thaiv shrinkage thiab tawg. Shrinkage cracks tuaj yeem cuam tshuam lub qhov ruaj khov thiab ntev ntawm cov ntaub ntawv tsim kho.
2. Txhim Kho Cov Haujlwm Ua Haujlwm
HPMC txhim kho kev ua haujlwm ntawm cov khoom siv tsim kho, ua rau lawv yooj yim rau lis thiab thov. Qhov no muaj ntau yam cuam tshuam rau kev ua haujlwm ntev:
Cov kev pabcuam niaj hnub: Kev ua haujlwm zoo ua kom ntseeg tau tias kev siv tshuaj, xws li cov nplaum thiab cov nplaum, tuaj yeem siv ntau yam. Daim ntawv thov tsis zoo me me tsis zoo rau cov pob hluav taws uas muaj peev xwm dhau los ua lub sijhawm dhau sijhawm.
Thixotropic cov khoom: HPMC coj tus cwj pwm uas tsis muaj neeg muaj neej nyob rau hauv neeg muaj nyiaj txiag thiab lwm yam kev sib xyaw ua ke thaum nws ua rau lub xeev ruaj khov dua thaum so. Cov cuab yeej no pab ua kom muaj kev ruaj ntseg thiab kev ncaj ncees ntawm cov khoom thaum lub sijhawm thov, txo qhov kev pheej hmoo ntawm sagging lossis hloov chaw.
3. Nce adhesion
HPMC txhim kho cov khoom siv nplaum ntawm kev siv tshuaj, uas yog qhov tseem ceeb rau kev ua kom muaj txiaj ntsig ntawm cov khoom ua qhev:
Cov ntawv cog lus muaj zog: Txhim kho cov nplaum ntawm cov khoom sib txawv ntawm cov ntaub ntawv, xws li nyob rau hauv cov nplais nplaum lossis sab nrauv cov khoom siv ua tiav raws li cohesive tsev. Qhov Cohesion no yog qhov tseem ceeb rau nrog kev ntxhov siab kho tshuab thiab ib puag ncig cov kev mob ib puag ncig lub sijhawm.
Txo cov delamination: txhim kho cov nplaum txo qhov kev pheej hmoo ntawm kev pheej hmoo, qhov twg cov khaubncaws sab nraud povtseg sib cais. Delamination tuaj yeem ua rau cov txheej txheem tsis muaj zog thiab txo qhov txo ntawm lub neej tag nrho ntawm kev tsim kho.
4. Txhim kho cov khoom siv kho tshuab
Kev koom tes ntawm HPMC hauv kev siv tshuaj ua rau txhim kho cov khoom siv neeg kho tshuab, xws li qhov hloov pauv thiab lub zog compressive:
Lub zog Faitrian: tau nce lub zog Flucural zog pab cov ntaub ntawv wallet wallt force yam tsis muaj kev tawg. Qhov no yog qhov tshwj xeeb tshaj nyob rau hauv cov ntawv thov xws li cov ntaub ntawv hauv tsev thiab vov tsev, uas cov ntaub ntawv uas muaj kev ntxhov siab yooj yim.
Compressive muaj zog: txhim kho compressive zog pub cov khoom kom dais cov khoom loj. Qhov no yog qhov tseem ceeb rau cov txheej txheem xws li cov pob zeb ua vaj tse thiab cov kab teeb, kom lawv muaj peev xwm txhawb nqa qhov hnyav lawv tau tsim los nqa.
5. Kev ruaj khov thiab homogeneity
HPMC pab tswj cov tshuaj sib xyaw ua ke, tiv thaiv kev sib cais ntawm cov khoom siv:
Kev ncua sij hawm: nws ua kom zoo nkauj tau raug tshem tawm tsis zoo nyob rau hauv kev sib tov, uas yog qhov tseem ceeb rau kev ua tau zoo thiab kav ntev. Cegregation ntawm cov khoom siv tuaj yeem ua rau cov pob tsis muaj zog thiab ua ntej ua tsis tiav.
Viscosity tswj: Los tswj lub viscosity ntawm kev tsim kho viscosity, HPMC kom cov ntaub ntawv tuaj yeem thov tau yam tsis muaj kev sib luag. Tus Viscosity kom zoo yog qhov tseem ceeb los tswj cov khoom xav tau ntawm cov khoom hauv cov txheej txheem thov.
6. Tsis kam rau ib puag ncig cov khoom
Lubricability nyob rau hauv cov khoom siv cov khoom siv kuj txhais tau tias nrog kev ua kom muaj ntau yam, thiab HPMC pab cuam hauv qhov no zoo li:
Thermal Stability: HPMC muab thermal stability rau kev tsim kho cov khoom siv, pab lawv kom kwv yees qhov tsis muaj kev cuam tshuam. Qhov no yog qhov tshwj xeeb tshaj yog rau cov ntaub ntawv cov ntaub ntawv nthuav tawm sab nraud.
Tshuaj lom neeg tiv thaiv: Muaj HPMC tuaj yeem txhim kho kev tiv thaiv kev siv tshuaj ua rau muaj kuab lom thiab cov pa paug. Qhov no tsis kam yog qhov tseem ceeb rau cov ntaub ntawv siv hauv cov chaw muaj kev lag luam lossis muaj kuab paug hauv nroog.
7. Kev tiv thaiv ntawm microcacks
Microcracks tuaj yeem tsim vim muaj ntau yam kev ntxhov siab thiab ib puag ncig cov ntsiab lus, ua rau lub sijhawm ntev ua kom tsis zoo ntawm cov ntaub ntawv. HPMC ua si lub luag haujlwm hauv kev ntsuas qhov teeb meem no:
Kev ntxhov siab: los ntawm kev txhim kho cov elasticity thiab tensile lub zog ntawm cov khoom siv, HPMC pab faib cov kev ntxhov siab ntau dua, tiv thaiv kev tsim cov microcacks.
Dampening deeg: txhim kho cov kev cuam tshuam nrog kev cuam tshuam thiab kev thauj khoom zoo, uas tuaj yeem ua lwm yam ua rau lub sijhawm.
8. Txhim Kho Durability nyob rau hauv cov ntawv thov tshwj xeeb
Qee cov ntawv teev tshwj xeeb tau txais txiaj ntsig tsis zoo los ntawm kev ntxiv ntawm HPMC:
Cov nplaum nplaum: Hauv cov pobzeb nplaum, HPMC ua kom muaj zog ua kom muaj zog thiab muaj zog, hloov chaw, yog li kev tiv thaiv cov vuas los ntawm kev tawg lossis debonding.
EIFS: rau sab nrauv rwb thaiv tsev xov, hpmc pab txhawb kev siv hluav taws xob sab nraud, ua rau muaj kev kub ntxhov ntev, thiab nag thiab kub.
Gypsum Plasters: HPMC txhim kho kev sib kis thiab lub sijhawm teeb tsa lub sijhawm ntawm Gypsum Plasters, kom ua tiav, ruaj khov ua kom tsis txhob tawg thiab ntsws.
HydroxyPropyyl methylcellueculose (HPMC) yog qhov tseem ceeb hauv kev tsim kho niaj hnub, txhim kho lawv qhov ruaj khov los ntawm kev ua haujlwm. Nws lub peev xwm los khaws cov dej, txhim kho kev ua haujlwm, thiab txhim kho cov khoom zoo nkauj txhua yam ua rau cov khoom siv tsim kho. Los ntawm kev tiv thaiv kev tiv thaiv microcracks, ruaj khov sib xyaw, thiab muab cov haujlwm tsim kho tsis zoo tab sis kuj muaj peev xwm ua kom lub sijhawm thiab siv tau. Kev sib txuam ntawm HPMC hauv kev tsim kho yog li sawv cev rau kev ua haujlwm tseem ceeb hauv kev tshawb nrhiav cov ntaub ntawv hauv tsev, hloov tau zoo, thiab ntev.
Lub Sijhawm Post: Feb-18-2025