Putty yog ib qho tseem ceeb hauv lub tsev siv rau phab ntsa leveling, thiab nws cov kev ua tau zoo cuam tshuam rau cov nplaum ntawm cov xim thiab cov khoom siv ua tau zoo. Nyob rau hauv lub freatulation ntawm putty, cellulose ether adabsis ua si ib lub luag haujlwm tseem ceeb.HydroxyPropyyl methylcellulose (HPMC), raws li ib qho ntawm feem ntau siv cov neeg cellulose feem ntau, tuaj yeem txhim kho lub piscosity, kev tsim kho kev ua haujlwm thiab kev ruaj khov ntawm putty.
1. Cov teeb meem yooj yim ntawm hydroxypropyl methylcellose
HPMC yog cov dej tsis-ionic-soluble polymer nrog zoo thickening, dej tuav, dispersion, emulsification thiab zaj duab xis-ua cov khoom. Nws cov viscosity cuam tshuam los ntawm cov qib kev hloov chaw, qib ntawm polymerization thiab solubility cov mob. Cov tshuaj aqueous ntawm kev txhawj xeeb ®
2. Cov nyhuv ntawm HPMC ntawm Putty viscosity
2.1 Thuab nyhuv
HPMC ua cov qauv siab viscosity tom qab ua rau muaj dej. Nws cov nyhuv thickening yog feem ntau tshwm sim hauv cov hauv qab no:
Txhim kho lub thixotrotropy ntawm putty: HPMC tuaj yeem ua kom lub putty nyob ntawm lub viscosity siab thaum nws nyob ruaj khov thaum scraposity thaum scraposing thiab txhim kho kev ua haujlwm.
Kev txhim kho cov kev ua haujlwm ntawm Putty: tus nqi ntawm HPMC tsim nyog txhim kho lubricity ntawm putty, ua scrother thiab txo kev ua haujlwm tsis kam.
Cuam tshuam rau lub zog kawg ntawm putty: cov nyhuv tuab ntawm HPMC ua rau muaj cov muab tub lim thiab cov xis ntxhee thiab cov khoom qab zib tawg thiab txhim kho qhov nyuaj tom qab kev tsim kho.
2.2 nyhuv rau cov txheej txheem hydration
HPMC muaj cov dej ua kom zoo heev, uas tuaj yeem txo cov txheej evaporation ntawm cov khoom siv putty, Li txhim kho lub zog thiab txhim kho lub zog thiab tawg ntawm putty. Txawm li cas los xij, kev viscosity siab dhau ntawm HPMC yuav cuam tshuam rau huab cua permeability thiab kom qhuav nrawm ntawm putty, ua rau txo kev ua haujlwm zoo. Yog li ntawd, tus nqi HPMC yuav tsum ua kom muaj kev ua haujlwm thaum tsis txhob muaj kev phom sij rau lub sijhawm ua kom tawv.
2.3 Kev sib raug zoo ntawm cov molecular phaus ntawm HPMC thiab viscosity ntawm putty
Lub siab dua cov molecular hnyav ntawm HPMC, cov viscosity ntau dua ntawm nws cov kua aquees. Hauv putty, siv cov high-viscosity HPMC (xws li hom nrog viscority retention thiab anti-sagging cov khoom ntawm cov putty, tab sis nws kuj tseem yuav ua rau muaj kev txo qis hauv kev ua haujlwm tsawg dua Cov. Yog li ntawd, nyob rau hauv cov kev tsim kho sib txawv, HPMC nrog qhov tsim nyog viscosity yuav tsum tau xaiv kom tau nyiaj kom sib npaug hauv dej, kev ua haujlwm thiab kev ua haujlwm zaum kawg.
2.4 Cov nyhuv ntawm HPMC ntau npaum li ntawm Putty viscosity
Qhov ntau ntawm kev txhawj xeeb ® Thaum cov nqi ntawm HPMC yog tsawg, cov nyhuv tuab rau lub putty yog txwv, thiab nws yuav tsis muaj peev xwm ua kom muaj txiaj ntsig zoo ua haujlwm thiab dej khaws cia. Thaum cov tshuaj ntau dhau, lub putcosity ntawm lub putty yog loj heev, kev siv zog loj heev, thiab nws yuav cuam tshuam rau kev ziab nrawm ntawm lub putty. Yog li ntawd, nws yog ib qho tsim nyog los xaiv tus nqi uas tsim nyog HPMC raws li cov qauv ntawm cov putty thiab kev tsim kho.
HydroxyPropy muag methylcellulose plays lub luag haujlwm hauv thickening, dej tuav thiab txhim kho kev ua haujlwm hauv kev ua haujlwm. Cov kev hnyav molecular, cov qib hloov pauv thiab ntxiv tus nqi ntawmHPMCyuav cuam tshuam cov viscosity ntawm putty. Tus nqi HPMC tsim nyog txhim kho qhov kev ua haujlwm thiab dej tsis kam ntawm putty, thaum ntau dhau yuav ntxiv teeb meem ntawm kev tsim kho. Yog li ntawd, nyob rau hauv qhov kev thov tiag tiag ntawm putty, tus yam ntxwv viscosity thiab kev tsim kho ntawm HPMC yuav tsum tau ua rau muaj kev tsim kho kev tsim kho zoo tshaj plaws thiab qhov kawg.
Lub sij hawm Post: Feb-10-2025