Hydroxypropyl methylcellulose (HPMC) yog ib qho khoom siv ntxiv uas siv dav hauv kev tsim kho, tshwj xeeb hauv cov phab ntsa putty formulations. HPMC muaj ntau yam zoo uas pab txhim kho kev ua tau zoo thiab zoo ntawm phab ntsa putty. Nov yog peb qhov zoo ntawm kev siv HPMC hauv phab ntsa putty:
Kev tuav dej thiab sib xws:
Ib qho ntawm cov txiaj ntsig tseem ceeb ntawm kev sib koom ua ke HPMC rau hauv cov txheej txheem phab ntsa yog nws cov dej tuav tau zoo heev. HPMC yog hydrophilic polymer, txhais tau tias nws muaj kev sib raug zoo rau dej. Thaum ntxiv rau phab ntsa putty, HPMC tsim cov yeeb yaj kiab uas muaj dej nyob ib puag ncig cov cement, tiv thaiv cov dej kom sai sai thaum lub sijhawm kho.
Lub peev xwm ntawm HPMC khaws cov dej noo hauv qhov sib tov muaj ntau yam txiaj ntsig rau kev siv phab ntsa putty. Ua ntej thiab qhov tseem ceeb, nws txhim kho kev ua haujlwm ntawm putty thiab ncua nws lub sijhawm qhib, ua kom yooj yim rau kev sib kis thiab du ntawm lub substrate. Qhov no yog qhov tshwj xeeb tshaj yog muaj txiaj ntsig hauv kev tsim kho, uas cov neeg ua haujlwm yuav xav tau sijhawm ntxiv los thov thiab ua kom tiav cov phab ntsa putty ua ntej nws teeb.
Tsis tas li ntawd, HPMC lub peev xwm tuav dej pab txhim kho putty adhesion rau lub substrate. Lub sijhawm ntev ntawm cov dej kom ntseeg tau tias muaj dej txaus ntawm cov cement hais, uas ua rau muaj kev sib raug zoo thiab ntev ntev ntawm cov phab ntsa putty thiab hauv qab. Qhov no yog qhov tseem ceeb rau kev ua haujlwm ntev thiab kev ncaj ncees ntawm phab ntsa putty raug siv.
Txhim kho cohesion thiab sag kuj:
HPMC ua raws li ib tug thickener thiab binder nyob rau hauv cov phab ntsa putty formulations, txhim khu cov khoom cohesion. Lub xub ntiag ntawm HPMC pab tswj kev ncaj ncees thiab cov qauv ntawm lub putty, tiv thaiv nws los ntawm sagging los yog collapsing thaum siv rau ntsug nto. Qhov no yog qhov tseem ceeb tshwj xeeb tshaj yog rau cov ntawv siv nyiaj siv ua haujlwm lossis thaum ua haujlwm ntawm phab ntsa ntawm qhov sib txawv.
Lub thickening zog ntawm HPMC pab ua kom lub thickness thiab sib xws ntawm cov phab ntsa putty, cia nws mus adheres zoo dua rau substrate tsis khiav los yog dripping. Yog li ntawd, phab ntsa putties uas muaj HPMC muaj kev tiv thaiv ntau dua rau sag, kom ntseeg tau tias ib daim ntawv thov sib npaug thiab zoo ib yam, tshwj xeeb tshaj yog nyob rau sab ntsug thiab qhov siab. Cov cuab yeej no pab txhawb kev du thiab zoo nkauj ua tiav.
Tsis tas li ntawd, kev txhim kho kev sib koom ua ke muab los ntawm HPMC pab cov phab ntsa putty tiv thaiv kev tawg. Cov ntaub ntawv polymer tsim cov yeeb yaj kiab hloov tau yooj yim uas haum rau kev txav me me hauv cov substrate, txo qhov kev pheej hmoo ntawm cov kab nrib pleb dhau sijhawm. Qhov no yog qhov tseem ceeb hauv kev ua haujlwm ntawm phab ntsa putty, vim tias cov kab nrib pleb tuaj yeem cuam tshuam rau qhov pom thiab ua haujlwm ntev ntawm cov txheej txheej.
Enhanced adhesion thiab bonding zog:
Adhesion yog qhov tseem ceeb hauv kev ua haujlwm ntawm phab ntsa putty, uas cuam tshuam ncaj qha rau kev sib txuas ntawm lub zog ntawm putty thiab substrate. HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho adhesion los ntawm kev tsim cov yeeb yaj kiab sib txuas thiab hloov tau yooj yim uas txhawb nqa kev sib raug zoo ntawm lub ntsej muag.
Lub peev xwm tuav dej ntawm HPMC kom ntseeg tau tias cov dej txaus muaj rau cov dej ntawm cov cement hais, txhawb kev tsim kom muaj kev sib raug zoo ntawm phab ntsa putty thiab substrate. Qhov no yog ib qho tseem ceeb tshwj xeeb tshaj yog thaum siv putty rau qhov ntxeem tau los yog qhov nyuaj, qhov twg tau txais adhesion zoo tuaj yeem nyuaj dua.
Tsis tas li ntawd, HPMC pab txo qis qis thaum ziab thiab kho cov txheej txheem ntawm phab ntsa putty. Kev txo qis qis pab tswj kev sib cuag ntawm putty thiab substrate, ntxiv dag zog rau kev sib raug zoo. Qhov tshwm sim yog phab ntsa putty uas adheres rau ntau yam ntawm qhov chaw, muab kev ua tau zoo ntev thiab tsis kam mus rau tev lossis delamination.
Hydroxypropyl methylcellulose (HPMC) muaj ntau yam zoo thaum muab tso rau hauv phab ntsa putty formulations. Nws cov khoom tuav dej txhim kho kev ua haujlwm thiab kev ua kom zoo, thaum nws cov thickening thiab khi muaj peev xwm pab txhim kho cohesion thiab sag resistance. Kev siv HPMC hauv phab ntsa putty formulations thaum kawg tuaj yeem muab kev tsim kho kev lag luam nrog cov khoom siv ruaj khov, zoo nkauj thiab ua haujlwm siab rau sab hauv thiab sab nrauv.
Post lub sij hawm: Nov-28-2023