HydroxyPropyyl methylcellose (HPMC) yog cov khoom siv roj polymer siv hauv cov khoom tsim kho, tshwj xeeb tshaj yog nyob rau hauv cov qauv ua qauv. Nws ua kom tiav vib phais adhesion los ntawm ntau yam ntawm cov qauv.
1. Txhim kho txoj kev tsim kho ntawm cug
HPMC muaj dej zoo heev thiab lub cev, uas tuaj yeem txhim kho kev tsim kho kev tsim kho ntawm cug. Kev txhim kho hauv kev tsim kho kev ua yeeb yam ua rau lub tshuaj khib kom tau ntau dua ntawm cov txheej txheem ntawm cov txheej txheem ntawm cov txheej txheem tsis sib xws thaum lub sijhawm ua haujlwm.
Dej khaws cia: HPMC muaj peev xwm ntev lub sij hawm evapong lub sij hawm hauv lub tshuaj khib, kom muaj sijhawm zoo los ua kom tiav cov tshuaj khib los ua kom tiav cov cement tom qab daim ntawv thov. Qhov kev cuam tshuam ntawm cov dej cawv txaus no pab ua kom muaj qhov ceev, cov gel muaj zog uas muaj ntau nrawm sib khi mus rau saum npoo ntawm substrate.
Cov nyh siab roj nplua nyeem: HPMC ua rau lub tshuaj khib muaj cov tshuaj khib nyiab zoo thiab ua tiav tau yooj yim ntawm thaj chaw sib sau thiab cov khoom lag luam loj dua thiab cov nplaum.
2. Txhim Kho Cohesion ntawm cug
HPMC tuaj yeem txhim kho txoj hlua khi ntawm cug thiab tiv thaiv kev tawg lossis poob thaum tsim khoom thiab ziab.
HPMC ua ib tus qauv network yooj yim hauv kev sib khib kom nruj nreem muab cov khoom siv thiab txo qhov kev sib xyaw ntawm cov kab cug.
Kev txhim kho ntawm Cohesion tsis tau txhim kho cov nplaum ntawm cov nplaum ntawm substrate, vim tias cov hlua khi txaus yuav ua rau txhawm rau txhawm rau txhawm rau txhawm rau txhawm rau ntawm cov nplaum txheej.
3. Txhim kho txoj haujlwm interface interface
Cov nplaum ntawm collhu kom ze ze rau cov interface cuam tshuam rau saum npoo ntawm substrate. Cov qauv zoo tshwj xeeb ntawm HPMC ua si lub luag haujlwm hauv kev hloov pauv thiab nkag mus rau ntawm lub interface:
Permeability: After HPMC is dissolved, it will produce a colloidal solution with a certain viscosity, which can penetrate into the capillary pores on the surface of the substrate and produce mechanical locking with the substrate, thereby improving adhesion.
Interface Wettability: HPMC txo tus nro ntawm lub cug, ua kom yooj yim mus rau saum npoo ntawm substrate thiab ua ib qho kev sib tw thiab cov txheej sib tiv toj thiab kaw kev sib ze nrog lub substrate.
4. Txo cov shrinkage qhuav
Qhuav shrinkage tawg yog qhov teeb meem uas cuam tshuam uas cuam tshuam cov nplaum ntawm cug, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej qhuav. HPMC ua tau zoo txo kom qhuav shrinkage nrib pleb los ntawm cov txheej txheem nram qab no:
Cov dej khaws cia ntawm HPMC ua rau cov dej tshuaj khib ntau txawm tias thaum lub sijhawm ua kom tawv nqaij tawv los ntawm kev ziab qhuav.
Cov txiaj ntsig tswj kav dej rov qab kuj tseem txo cov ziab khaub ncaws ntawm cov theem ntawm kev kho kom tawg, yog li txo qhov kev ncaj ncees thiab ruaj khov ntawm cov nplaum txheej.
5. Txhim kho cov shear lub zog ntawm cug
Adhesion yog qhov tseem ceeb ib qho interfacial lub zog. Tus qauv PCOylastic network tsim los ntawm HPMC nyob rau hauv lub tshuaj khib nyiab tsim los txhim kho lub zog ci ntawm lub tshuaj khib, yog li txhim kho adhesion.
Txoj kev tswj hwm network no tuaj yeem tawg kev ntxhov siab thaum raug yuam kom thiab zam kev ua tsis tiav hauv cheeb tsam.
HPMC tseem tuaj yeem txhim kho qhov hloov tau thiab tawg tawm ntawm cug tshuaj cug, tso cai rau nws kom nws zoo yoog raws li kev tiv thaiv me ntawm substrate.
6. Txhim kho lub durability ntawm cug
Lubricability yog qhov tseem ceeb hauv kev txij nkawm ntev. HPMC txhim kho nws lub peev xwm tiv thaiv ib puag ncig ib puag ncig (xws li dej, cua sov, ultraviolet rays, thiab lwm yam) los ntawm kev hloov lub tshuaj khib.
HPMC tuaj yeem txhim kho lub khov-thaws ntawm cug thiab tiv thaiv cov nplaum txheej los ntawm kev poob vim yog khov-thaw mus.
Nyob rau hauv cov kev mob siab, HPMC cov teebmeem kev khaws cia thiab rov ua kom muaj kev tshuaj khib nyiab los tiv thaiv cov dej phib los ntawm kev ua kom dhau los vim cov dej ntau dhau.
7. Kev yoog tau rau lwm lub substrates
HPMC tuaj yeem hloov kho lub cug cov mis nyuj kom haum rau ntau hom kev sib txawv ntawm cov substrates (xws li pob zeb ua, masonry, gypsum board, thiab lwm yam). Los ntawm kev ua kom zoo ntxiv cov nyiaj thiab viscosity ntawm HPMC, cap cap tuaj yeem ua tau zoo dua cov nplaum xav tau ntawm cov kev xav tau ntawm cov substrates.
HPMC tseem ceeb txhim kho cov nplaum ntawm kev txhim kho ntau yam xws li cug ua haujlwm, cohesion, interrace ua haujlwm, tawg tawm thiab ruaj khov. Kev siv HPMC tsis tuaj yeem txhim kho cov kev ua haujlwm sib tov, tab sis kuj txuas ntxiv rau nws lub neej ua haujlwm, ua si ib qho kev pabcuam thiab tseem ceeb hauv kev tsim kho.
Lub sijhawm Post: Feb-15-2025