HPMC, tseem hu ua hydroxypropyl methylcellulose, yog ib qho kev siv tshuaj ntxiv hauv ntau yam lag luam.Hauv kev tsim kho kev lag luam, HPMC tau siv dav hauv cov khoom siv cement xws li putty hmoov, gypsum, thiab cement mortar.HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm cov hmoov putty los ntawm kev ua haujlwm zoo, sib zog ua kom muaj zog thiab tuav dej.Txawm li cas los xij, thaum HPMC siv rau cov hmoov nplej, ib qho tshwm sim hu ua "foaming" tshwm sim.Hauv tsab xov xwm no, peb tshawb nrhiav qhov ua rau hlwv thiab sib tham txog kev tiv thaiv lawv.
blistering yog dab tsi thiab yog vim li cas nws tshwm sim?
Blistering yog qhov tshwm sim ntawm huab cua npuas los yog hlwv ntawm qhov chaw ntawm putty hmoov tom qab kev tsim kho.Qhov no yuav tshwm sim tam sim tom qab daim ntawv thov lossis tom qab qee lub sijhawm, nyob ntawm qhov laj thawj.Blistering tuaj yeem tshwm sim los ntawm ntau yam xws li kev npaj cov substrate tsis zoo, kev thov nyob rau hauv ib puag ncig tsis zoo lossis siv cov khoom siv tsis sib xws.Cov laj thawj rau foaming ntawm HPMC thiab putty hmoov yog raws li nram no:
1. Incompatibility ntawm HPMC thiab lwm yam additives: HPMC feem ntau yog siv nrog rau lwm yam additives xws li superplasticizers, retarders, thiab air-entraining agents.Txawm li cas los xij, yog tias cov additives no tsis sib haum nrog ib leeg, foaming tuaj yeem ua rau.Qhov no tshwm sim vim hais tias cov additives cuam tshuam nrog ib leeg lub peev xwm los ua lawv txoj haujlwm xav tau, ua rau muaj kev sib xyaw tsis ruaj khov thiab tsis zoo rau lub substrate.
2. Kev sib xyaw tsis txaus: Thaum HPMC tov nrog cov hmoov putty, kev sib xyaw kom zoo yog qhov tseem ceeb heev.Kev sib xyaw tsis txaus tuaj yeem ua rau HPMC sib sau ua ke thiab tsim cov Islands tuaj hauv qhov sib tov.Cov Islands tuaj no tsim cov chaw tsis muaj zog ntawm cov hmoov putty, uas tuaj yeem ua rau hlwv.
3. Kev tuav dej: HPMC nto moo rau nws cov dej tuav, uas yog qhov zoo rau cov hmoov putty.Tab sis yog tias cov hmoov putty tau dej ntau dhau, nws yuav ua rau blistering.Qhov no feem ntau tshwm sim thaum cov hmoov putty siv nyob rau hauv high humidity tej yam kev mob los yog nyob rau ntawm qhov chaw uas tsis kho kom zoo.
4. Cov txheej txheem thov tsis zoo: Cov txheej txheem thov tsis zoo kuj tuaj yeem ua rau blistering.Piv txwv li, yog hais tias putty yog siv heev tuab, nws yuav ntxiab cua hnab ris hauv qab ntawm qhov chaw.Cov npuas no tuaj yeem nthuav dav thiab ua rau foaming.Ib yam li ntawd, yog hais tias putty yog thov sai heev los yog muaj zog ntau dhau, nws yuav tsim ib tug tsis muaj zog daim ntawv cog lus nrog lub substrate, uas yuav ua rau blistering.
Yuav tiv thaiv Blistering li cas
Tiv thaiv kom tsis txhob foaming thaum siv HPMC thiab cov hmoov putty yuav tsum tau ua tib zoo saib xyuas cov ntaub ntawv, cov txheej txheem thiab ib puag ncig kev koom tes.Nov yog qee cov lus qhia rau kev tiv thaiv hlwv:
1. Xaiv cov additives tau tshaj: Thaum siv HPMC, nws yog ib qho tseem ceeb uas yuav tau xaiv cov additives uas sib haum nrog ib leeg.Qhov no yuav pab xyuas kom meej tias qhov sib tov ruaj khov thiab txhua tus additive ua nws txoj haujlwm tsis muaj kev cuam tshuam nrog lwm tus.
2. Sib sib zog nqus: HPMC yuav tsum tau muab sib xyaw nrog cov hmoov putty kom ntseeg tau tias txawm faib.Qhov no pab tiv thaiv cov pob thiab tsis muaj zog ntawm qhov chaw ntawm cov hmoov putty.
3. Moisture tswj: Kev tswj cov dej noo yog qhov tseem ceeb thaum siv HPMC thiab cov hmoov putty.Nco ntsoov tias cov hmoov putty tsis tuaj yeem cuam tshuam nrog cov dej noo ntau dhau thaum tsim kho, thiab zam kev tsim kho nyob rau hauv high humidity los yog ntub dej.Yog tias tsim nyog, siv lub tshuab dehumidifier kom txo cov dej noo hauv huab cua.
4. Siv cov txheej txheem thov kom raug: Cov txheej txheem thov kom raug kuj yuav pab tiv thaiv kom tsis txhob muaj kab mob.Siv cov hmoov putty rau hauv nyias, txawm txheej thiab siv rau lub substrate nrog ib tug trowel los yog lwm yam tsim nyog siv.Tsis txhob siv cov hmoov nplej ntau dhau, nrawm dhau los yog siv zog ntau dhau.
5. Xav txog lub substrate: Lub substrate uas siv cov hmoov putty kuj cuam tshuam qhov kev pheej hmoo ntawm blistering.Xyuas kom cov substrate raug kho kom zoo, ntxuav thiab npaj ua ntej siv cov hmoov putty.Yog tias tsim nyog, primer tuaj yeem siv los txhim kho kev sib raug zoo ntawm substrate thiab putty hmoov.
Hauv kev xaus, blistering tuaj yeem yog qhov teeb meem ntxhov siab thiab tsis pom zoo thaum ua haujlwm nrog HPMC thiab cov hmoov putty.Txawm li cas los xij, qhov xwm txheej no tuaj yeem tiv thaiv nrog kev saib xyuas cov ntaub ntawv, cov txheej txheem thiab ib puag ncig kev koom tes.Los ntawm kev xaiv cov khoom sib xyaw ua ke, sib xyaw kom zoo, tswj cov dej noo, siv cov txheej txheem kev thov kom raug, thiab xav txog cov txheej txheem substrate, koj tuaj yeem ua kom tiav qhov du, tsis muaj npuas npuas txhua lub sijhawm.Ua ib lub chaw tsim khoom HPMC, peb tau cog lus los muab cov khoom lag luam zoo uas ua tau raws li peb cov neeg siv khoom xav tau.Peb cia siab tias tsab xov xwm no tau pab kom nkag siab tias yog vim li cas HPMC thiab putty hmoov ua npuas ncauj thiab yuav tiv thaiv nws li cas.
Post lub sij hawm: Lub Xya hli ntuj-20-2023