Putty hmoov yog cov khoom siv hauv tsev nrov siv los pleev xim thiab kho cov phab ntsa, qab nthab thiab lwm qhov chaw.Nws yog kev sib xyaw ntawm ntau yam ntaub ntawv xws li cement, muab tub lim thiab binder.Hydroxypropylmethylcellulose (HPMC) yog ib qho ntawm cov binders siv nyob rau hauv putty hmoov.HPMC yog ib qho tsis muaj tshuaj lom, tsis muaj ntxhiab polymer uas txhim kho kev ua haujlwm ntawm cov hmoov putty.Nws yog siv rau hauv cov kab nrib pleb hauv ntau hom putty los txhim kho nws cov kev ua tau zoo.Kab lus no yuav tham txog plaub hom kab nrib pleb thiab yuav siv HPMC li cas hauv txhua hom.
Plaub hom putty tawg yog raws li nram no:
1. Kev tawg tawg
Shrinkage tawg vim qhuav putty.Raws li cov putty dries, nws shrinks, ua rau cov kab nrib pleb tshwm rau saum npoo.Qhov hnyav ntawm cov kab nrib pleb no nyob ntawm qhov muaj pes tsawg leeg ntawm putty.HPMC tuaj yeem muab ntxiv rau putty kom txo tau cov kab nrib pleb.HPMC ua raws li cov dej khaws cia, ua kom cov txheej txheem kom qhuav thiab cia cov putty kom qhuav kom sib npaug.Nws kuj tseem txo cov dej xav tau los sib tov cov putty, uas yuav pab txo qis qis thaum ziab.
2. Kub tawg
Kub tawg yog tshwm sim los ntawm kev nthuav dav thiab kev cog lus ntawm cov khoom raws li qhov kub thiab txias hloov.Lawv muaj nyob rau hauv cov tsev uas muaj qhov kub thiab txias hloov pauv, xws li hauv cov cheeb tsam uas muaj huab cua huab cua.HPMC tuaj yeem pab txo qis thermal tawg los ntawm kev ua kom cov dej tuav cov khoom ntawm putties.Lub polymer ua raws li ib tug binder uas pab tuav lwm yam khoom ntawm putty ua ke.Qhov no nyob rau hauv lem txo txoj kev pheej hmoo ntawm tawg vim thermal expansion thiab contraction.
3. Hardening tawg
Hardening tawg yog tshwm sim los ntawm hardening ntawm putty.Raws li putty hardens, nws poob ib co ntawm nws yooj, ua rau nws tawg.HPMC tuaj yeem pab txo cov kab nrib pleb los ntawm kev ua kom yooj yim ntawm putty.Qhov no polymer ua raws li ib tug plasticizer, ua rau lub putty saj zawg zog.Qhov no tso cai rau nws los tiv thaiv kev txav ntawm qhov chaw nws tau pleev xim rau, txo qhov kev pheej hmoo ntawm kev tawg.
4. Cov kab nrib pleb
Cov kab nrib pleb tshwm sim vim qhov txav ntawm cov qauv lossis hauv qab ntawm qhov chaw.Lawv tuaj yeem tshwm sim los ntawm ntau yam, xws li kev tawg, av qeeg, lossis kev hloov pauv ntawm cov av noo.HPMC tuaj yeem pab txo cov kab nrib pleb los ntawm kev txhim kho cov nplaum nplaum ntawm putties.Lub polymer ua raws li ib tug binder, pab lub putty kom adhering zoo dua rau saum npoo.Qhov no nyob rau hauv lem txo txoj kev pheej hmoo ntawm kev tawg vim kev txav ntawm lub hauv paus nto.
HPMC yog cov khoom tseem ceeb hauv cov hmoov putty vim nws tuaj yeem pab txhim kho kev ua haujlwm ntawm ntau hom putty tawg.Los ntawm kev txo cov kev pheej hmoo ntawm shrinkage, tshav kub, hardening thiab structural cracking, HPMC tuaj yeem pab xyuas kom cov putties kav ntev dua thiab khaws lawv cov kev zoo nkauj.Raws li kev tsim kho kev lag luam txuas ntxiv mus, HPMC tseem yog cov khoom tseem ceeb hauv putties rau txhua daim ntawv thov kev tsim kho.
Post lub sij hawm: Aug-23-2023