Hydroxypropyl methylcellulose (HPMC) yog ib qho cellulose ether uas tsis yog ionic siv dav hauv kev tsim kho vaj tse. HPMC muaj cov khoom zoo heev uas ua rau tuab, khaws dej, tsim zaj duab xis, ua kom lubrication thiab lwm yam khoom, yog li nws ua lub luag haujlwm tseem ceeb hauv kev tsim kho vaj tse. Tshwj xeeb tshaj yog hauv kev txhim kho qhov ruaj khov thiab lub zog ntawm cov ntaub ntawv, HPMC yog ib qho ntawm cov khoom ntxiv uas tseem ceeb.
Lub tshuab ntawm HPMC los txhim kho qhov ruaj khov thiab lub zog ntawm cov ntaub ntawv tsim kho
1. Kev khaws dej
Ib qho ntawm cov haujlwm tseem ceeb tshaj plaws ntawm HPMC yog nws qhov kev khaws cia dej zoo heev. Hauv cov ntaub ntawv ua los ntawm cement thiab cov ntaub ntawv ua los ntawm gypsum, kev khaws cia dej yog qhov tseem ceeb rau cov txheej txheem tawv thiab kho ntawm cov khoom. Cement xav tau dej hauv cov tshuaj tiv thaiv hydration, thiab cov tshuaj tiv thaiv hydration txaus pab tsim cov cement matrix ntom ntom, yog li txhim kho lub zog ntawm cov khoom. Yog tias cov dej poob sai dhau, cov tshuaj tiv thaiv hydration yuav tsis tiav, tsim cov khoom siv nrog ntau lub qhov hws thiab cov qauv xoob, uas thaum kawg yuav txo qhov muaj zog thiab ruaj khov ntawm cov khoom.
HPMC ua kom ntseeg tau tias cov dej hauv cov khoom yuav tsis ploj sai sai thaum lub sijhawm pib tawv los ntawm kev khaws dej. Qhov kev khaws dej zoo no ua rau lub sijhawm hydration ntawm cement thiab gypsum ntev dua, ua rau lawv muaj zog dua, yog li txhim kho lub zog thiab qhov ceev ntawm cov khoom thiab txhim kho qhov ruaj khov ntawm cov khoom. Tshwj xeeb tshaj yog nyob rau hauv huab cua qhuav thiab kub, kev khaws dej ntawm HPMC yog qhov tseem ceeb heev thiab tuaj yeem tiv thaiv kev tawg thiab ntsws.
2. Cov nyhuv tuab
Ua ib qho thickener, HPMC ua lub luag haujlwm hauv kev ua kom tuab thiab txhim kho rheology hauv cov ntaub ntawv tsim kho. Qhov thickening effect no pab txhim kho lub peev xwm ntawm cov mortar, faib cov khoom sib npaug xws li aggregates thiab cement hauv cov khoom, thiab tiv thaiv kev tshwm sim ntawm cov khoom stratification lossis sedimentation. Cov qauv khoom sib xws tuaj yeem ua rau nws muaj zog dua thiab ruaj khov dua tom qab hardening.
Thaum lub sijhawm tsim kho, qhov ua kom tuab kuj tseem tuaj yeem txhim kho kev ua haujlwm ntawm cov mortar thiab cov pob zeb ua vaj tse, ua rau nws yooj yim dua rau kev tsim kho thiab duab. Tshwj xeeb tshaj yog nyob rau hauv qhov kub siab lossis cov av noo, qhov ua kom tuab ntawm HPMC tuaj yeem tiv thaiv cov mortar lossis cov pob zeb ua vaj tse kom tsis txhob diluted dhau thiab xyuas kom meej nws lub zog kawg tom qab hardening.
3. Txhim kho kev ua haujlwm ntawm kev tsim kho
HPMC kuj tseem tuaj yeem txhim kho kev ua tau zoo ntawm cov ntaub ntawv tsim kho. Nws tuaj yeem kho qhov viscosity ntawm mortar lossis concrete, ua rau nws yooj yim dua rau kev ua haujlwm thaum lub sijhawm tsim kho thiab txo qhov nyuaj ntawm kev tsim kho. Tib lub sijhawm, nws kuj tseem tuaj yeem txhim kho cov khoom tiv thaiv kev poob qis ntawm mortar thiab tiv thaiv cov khoom los ntawm kev swb thaum tsim kho ntawm qhov chaw ntsug. Qhov kev ua tau zoo no yog qhov tseem ceeb rau kev tsim kho plastering ntawm phab ntsa sab nraud ntawm cov tsev, uas tuaj yeem faib cov khoom sib npaug thiab tsim cov txheej txheem sib xws, yog li txhim kho qhov ruaj khov thiab lub zog ntawm cov ntaub ntawv phab ntsa sab nraud.
Qhov nplua ntawm HPMC ua rau nws yooj yim dua rau kev siv thiab nthuav cov khoom siv hauv tsev thaum lub sijhawm tsim kho, yog li txhim kho kev ua haujlwm ntawm kev tsim kho. Qhov no tsis yog tsuas yog txo cov khoom pov tseg xwb, tab sis kuj ua kom cov khoom tsim ib qho chaw tiaj tus thiab ntom tom qab ua kom tawv, txhim kho lub zog tag nrho ntawm cov qauv tsev.
4. Tiv thaiv kev tawg
Cov ntaub ntawv siv hauv tsev feem ntau yuav tawg thaum lub sijhawm ua kom tawv, tshwj xeeb tshaj yog thaum cov dej ua pa sai sai. Cov kab nrib pleb yuav cuam tshuam rau lub zog tag nrho ntawm cov khoom siv thiab ua rau nws tsis muaj zog. HPMC tuaj yeem tiv thaiv tau qhov tshwm sim ntawm cov kab nrib pleb los ntawm nws cov dej khaws cia thiab cov khoom tuab.
Cov khoom siv khaws dej ntawm HPMC tuaj yeem ua rau qeeb qeeb ntawm cov dej hauv cov khoom siv thiab tiv thaiv cov yas tawg uas tshwm sim los ntawm kev qhuav ua ntej ntawm cov khoom siv. Tsis tas li ntawd, HPMC txhim kho qhov sib xws thiab cov khoom sib txuas ntawm cov khoom siv, ua rau nws tsim cov qauv ntom dua thaum lub sijhawm ua kom tawv, yog li txo qhov tshwm sim ntawm cov kab nrib pleb sab hauv. Txawm hais tias hauv kev sib npaug hauv av, kev sib txuas pobzeb lossis phab ntsa plastering, qhov kev tiv thaiv kab nrib pleb ntawm HPMC ua lub luag haujlwm tseem ceeb, yog li txhim kho lub neej ua haujlwm ntev thiab lub zog tag nrho ntawm cov khoom siv hauv tsev.
5. Txhim kho kev tiv thaiv huab cua
Cov ntaub ntawv tsim kho raug rau ib puag ncig ntuj tsim txhua xyoo puag ncig thiab yuav tsum tau ntsib ntau yam huab cua hnyav, xws li kub siab, kub qis, nag, ultraviolet rays, thiab lwm yam. Cov yam no yuav ua rau laus thiab puas tsuaj rau cov ntaub ntawv. HPMC tuaj yeem txhim kho kev tiv thaiv huab cua ntawm cov ntaub ntawv tsim kho kom lawv tseem tuaj yeem tswj tau qhov ua tau zoo hauv cov chaw raug tshav ntuj ntev.
HPMC txhim kho qhov ceev thiab permeability ntawm cov khoom, ua rau nws tiv taus kev yaig ntawm cov dej noo thiab txo qhov kev puas tsuaj ntawm cov dej noo rau cov qauv sab hauv ntawm cov khoom. Tsis tas li ntawd, HPMC txhim kho cov khoom tiv taus khov-thaw thiab tuaj yeem tiv thaiv cov khoom los ntawm kev nthuav dav thiab cog lus vim qhov kub hloov pauv ntawm qhov kub thiab txias heev, yog li zam kev tawg thiab tev tawm.
Daim ntawv thov ntawm HPMC hauv cov ntaub ntawv tsim kho sib txawv
1. Daim ntawv thov hauv cov cement mortar
HPMC tuaj yeem txhim kho nws cov dej tuav, ua haujlwm tau zoo thiab tsis tawg hauv cov cement-based mortar. Tshwj xeeb tshaj yog nyob rau hauv cov mortar thiab cov nplaum pobzeb uas tus kheej leveling, HPMC tsis yog tsuas yog txhim kho kev ua tau zoo ntawm cov khoom siv, tab sis kuj txhim kho nws lub zog thiab kev nplaum tom qab hardening, kom ntseeg tau tias cov ntaub ntawv tsim kho tseem tswj tau qhov kev ua tau zoo heev hauv kev siv mus sij hawm ntev.
2. Daim ntawv thov rau cov ntaub ntawv gypsum
Hauv cov ntaub ntawv gypsum, qhov kev khaws dej ntawm HPMC kuj tseem ceeb heev. Gypsum coagulates thiab hardens sai, thiab nws lub zog yooj yim cuam tshuam los ntawm dej tsis txaus. HPMC tuaj yeem txuas ntxiv kev ua haujlwm ntawm gypsum thiab xyuas kom meej tias nws muaj dej txaus los teb thaum lub sijhawm hardening, yog li txhim kho lub zog kawg ntawm cov khoom.
3. Daim ntawv thov rau sab nraud phab ntsa putty
HPMC muaj cov thickening, dej tuav thiab tawg tsis kam rau hauv phab ntsa sab nraud putty. Nws tuaj yeem ua kom cov putty muaj kev ua tau zoo thaum lub sijhawm thov, zam qhov tshwm sim ntawm sag, thiab tib lub sijhawm txhim kho kev tiv thaiv huab cua thiab kev ruaj khov ntawm putty, yog li ntawd phab ntsa sab nraud tseem zoo nkauj thiab tiaj tus rau lub sijhawm ntev.
Ua ib yam khoom siv ntxiv rau hauv tsev uas muaj ntau yam haujlwm, HPMC ua rau cov khoom siv hauv tsev ruaj khov thiab muaj zog dua los ntawm nws cov haujlwm ntawm kev khaws dej, ua kom tuab, tiv taus tawg, thiab txhim kho kev ua haujlwm ntawm kev tsim kho. Txawm hais tias nws yog cov cement mortar, cov ntaub ntawv gypsum lossis cov phab ntsa sab nraud, HPMC tau ua pov thawj tias muaj kev ua tau zoo heev thiab tau dhau los ua cov khoom siv tseem ceeb hauv kev tsim kho niaj hnub no.
Lub sijhawm tshaj tawm: Cuaj hlis-09-2024