HPMC rau Qhuav mix mortar

Cov yam ntxwv ntawm HPMC nyob rau hauv qhuav mix mortar

1, HPMC nyob rau hauv cov yam ntxwv ntawm cov mortar zoo tib yam

HPMC feem ntau yog siv los ua retarder thiab dej tuav tus neeg sawv cev hauv cov cement piv.Nyob rau hauv cov khoom sib xyaw thiab mortar, nws tuaj yeem txhim kho viscosity thiab shrinkage tus nqi, ntxiv dag zog rau kev sib khi, tswj lub sijhawm teem ntawm cov cement, thiab txhim kho thawj lub zog thiab zoo li qub flexural zog.Vim tias nws muaj kev ua haujlwm ntawm cov dej tuav, tuaj yeem txo qhov poob dej ntawm qhov coagulation, tuaj yeem zam qhov tshwm sim ntawm cov kab nrib pleb ntawm ntug, thiab tuaj yeem txhim kho qhov adhesion thiab kev tsim kho kev ua haujlwm.Tshwj xeeb tshaj yog nyob rau hauv kev tsim kho, tuaj yeem ua kom ntev thiab kho lub sijhawm teeb tsa, nrog rau kev nce ntawm HPMC ntau npaum li cas, mortar teem sij hawm tau ntev;Txhim kho machinability thiab pumpability, haum rau kev siv tshuab;Nws tuaj yeem txhim kho kev tsim kho kom zoo thiab tiv thaiv huab cua ntawm cov dej-soluble ntsev ntawm lub tsev.

2, HPMC nyob rau hauv tshwj xeeb mortar yam ntxwv

HPMC yog cov dej tuav cov neeg ua haujlwm zoo rau cov mortar qhuav, uas txo cov ntshav los ntshav thiab qib stratification ntawm mortar thiab txhim kho cov cohesiveness ntawm mortar.HPMC tuaj yeem txhim kho lub zog tensile thiab kev sib koom ua ke ntawm mortar, txawm hais tias lub zog khoov thiab lub zog compressive ntawm mortar raug txo me ntsis los ntawm HPMC.Tsis tas li ntawd, HPMC tuaj yeem cuam tshuam qhov tsim ntawm cov kab nrib pleb hauv cov tshuaj khib nyiab, txo cov yas tawg qhov ntsuas ntawm cov tshuaj khib nyiab, cov dej khib nyiab tuaj yeem nce nrog qhov nce ntawm cov viscosity ntawm HPMC, thiab thaum lub viscosity ntau tshaj 100000mPa•s, dej tuav tsis tau lawm. nce ntxiv.HPMC fineness kuj muaj qee yam cuam tshuam rau cov dej tuav tus nqi ntawm mortar, thaum lub particle zoo, cov dej tuav tus nqi ntawm mortar tau txhim kho, feem ntau yog siv rau cement mortar HPMC particle loj yuav tsum tsawg dua 180 microns (80 mesh screen) .Cov ntsiab lus tsim nyog ntawm HPMC hauv mortar qhuav yog 1‰ ~ 3‰.

2.1, mortar HPMC tom qab yaj hauv dej, vim tias lub luag haujlwm ntog kom ntseeg tau tias cov khoom siv gelled zoo sib xws hauv lub cev, thiab HPMC yog hom kev tiv thaiv colloid, "pob" cov khoom, thiab ntawm nws sab nrauv los tsim ib qho txheej ntawm lubrication zaj duab xis, ua rau lub slurry system yog ruaj khov, kuj tsa lub mortar nyob rau hauv lub mixing txheej txheem ntawm liquidity thiab kev tsim kho ntawm daim tawv nqaij tej zaum yuav ib yam nkaus thiab.

2.2 HPMC tov vim nws tus kheej molecular qauv yam ntxwv, kom cov dej nyob rau hauv mortar tsis yooj yim los plam, thiab maj mam tso tawm nyob rau hauv ib lub sij hawm ntev, muab mortar zoo tuav thiab kev tsim kho.Tiv thaiv kom tsis txhob muaj dej txav nrawm dhau los ntawm mortar mus rau hauv paus, kom cov dej khaws cia tseem nyob rau saum npoo ntawm cov khoom tshiab, uas txhawb nqa cov dej ntawm cov cement thiab txhim kho lub zog kawg.Tshwj xeeb tshaj yog, yog hais tias lub interface nyob rau hauv kev sib cuag nrog cement mortar, plaster thiab binder poob dej, qhov no tsis muaj zog thiab yuav luag tsis muaj kev sib raug zoo quab yuam.Feem ntau hais lus, qhov chaw nyob rau hauv kev sib cuag nrog cov ntaub ntawv no yog lub cev adsorption, ntau dua los yog tsawg dua los nqus dej los ntawm qhov chaw, ua rau qhov no ntawm cov dej tsis tiav, kom cov cement mortar thiab ceramic pobzeb substrate thiab ceramic pobzeb los yog plaster thiab. metope daim ntawv cog lus lub zog poob.

Hauv kev npaj ntawm mortar, cov dej tuav ntawm HPMC yog qhov kev ua haujlwm tseem ceeb.Nws tau raug pov thawj tias kev tuav dej tuaj yeem siab txog 95%.Qhov nce ntawm HPMC molecular hnyav thiab cov cement ntau npaum yuav txhim kho cov dej tuav thiab kev sib raug zoo ntawm cov tshuaj khib nyiab.

Piv txwv li: vim hais tias cov pobzeb binder yuav tsum muaj kev sib raug zoo siab ntawm lub hauv paus thiab cov pobzeb, yog li cov binder cuam tshuam los ntawm ob yam ntawm cov dej adsorption;Base (phab ntsa) nto thiab vuas.Cov pobzeb ceramic tshwj xeeb, qhov zoo sib txawv yog qhov loj heev, qee qhov pores loj heev, ceramic pobzeb dej nqus tus nqi siab, yog li cov ntawv cog lus ua haujlwm raug rhuav tshem, tus neeg saib xyuas dej yog qhov tseem ceeb, thiab qhov sib ntxiv ntawm HPMC tuaj yeem ua tau raws li qhov no. kev xav tau.

2.3 HPMC ruaj khov rau cov kua qaub thiab cov hauv paus, thiab nws cov kua dej aqueous yog qhov ruaj khov nyob rau hauv thaj tsam ntawm pH = 2 ~ 12. Caustic soda thiab txiv qaub dej tsis muaj txiaj ntsig ntau rau nws cov khoom, tab sis alkali tuaj yeem ua kom nws qhov kev sib cais, thiab me ntsis. txhim kho viscosity.

2.4, ntxiv HPMC mortar kev tsim kho kev ua tau zoo tau zoo dua qub, mortar zoo li muaj "roj", tuaj yeem ua rau cov pob qij txha ntawm phab ntsa tag nrho, du nto, kom cov pobzeb lossis cib thiab lub hauv paus sib txuas ruaj khov, thiab tuaj yeem ua haujlwm ntev, haum rau loj. thaj tsam ntawm kev tsim kho.

2.5 HPMC yog ib yam uas tsis yog-ionic thiab tsis-polymeric electrolyte.Nws yog qhov ruaj khov heev hauv cov kua dej nrog cov ntsev ntsev thiab cov organic electrolytes, thiab tuaj yeem muab ntxiv rau hauv cov ntaub ntawv hauv tsev rau lub sijhawm ntev kom ntseeg tau tias nws txoj kev txhim kho durability.

HPMC cov txheej txheem ntau lawm yog cov paj rwb fiber ntau (hauv tsev) tom qab alkalization, etherification thiab tiam ntawm cov khoom siv polysaccharide ether.Nws tsis muaj nqi nws tus kheej, thiab tsis hnov ​​​​mob nrog cov ions hauv cov khoom siv gelled, thiab nws qhov kev ua tau zoo yog ruaj khov.Tus nqi qis dua li lwm hom cellulose ether, yog li nws tau siv dav hauv mortar qhuav.

Hydroxypropyl methyl cellulose HPMCmuaj nuj nqi nyob rau hauv qhuav mix mortar:

HPMCtuaj yeem ua rau cov tshuaj khib nyiab tshiab ua kom muaj qhov ntub dej viscosity, tiv thaiv kev sib cais.Kev tuav dej (thickening) kuj yog cov cuab yeej tseem ceeb tshaj plaws, pab tswj cov dej dawb hauv cov mortar, yog li muab cov khoom siv cementitious ntau lub sij hawm kom hydrate tom qab siv mortar.(dej tuav) nws tus kheej huab cua, tuaj yeem qhia cov npuas me me, txhim kho kev tsim kho ntawm mortar.

Hydroxypropyl methyl cellulose ether viscosity ntau dua dej tuav kev ua tau zoo dua.Viscosity yog qhov tseem ceeb ntawm HPMC kev ua haujlwm.Tam sim no, cov tuam txhab HPMC sib txawv siv cov kev sib txawv thiab cov cuab yeej los txiav txim siab qhov viscosity ntawm HPMC.Cov txheej txheem tseem ceeb yog HaakeRotovisko, Hoppler, Ubbelohde thiab Brookfield, thiab lwm yam.

Rau tib yam khoom, cov txiaj ntsig ntawm viscosity ntsuas los ntawm ntau txoj kev sib txawv heev, qee qhov txawm tias ntau qhov sib txawv.Yog li ntawd, thaum sib piv viscosity, nws yuav tsum tau nqa tawm ntawm tib txoj kev sim, xws li kub, rotor, thiab lwm yam.

Rau particle loj, qhov finer particle, qhov zoo dua cov dej tuav.Cov khoom loj ntawm cellulose ether tiv tauj nrog dej, qhov chaw tam sim ntawd yaj thiab tsim cov gel los qhwv cov khoom kom tiv thaiv cov dej molecules los ntawm kev txuas ntxiv mus, qee zaum ntev stirring tsis tuaj yeem sib npaug dispersed yaj, tsim cov av nkos flocculent tov los yog agglomerate.Lub solubility ntawm cellulose ether yog ib qho ntawm cov yam ntxwv los xaiv cellulose ether.Fineness kuj yog ib qho tseem ceeb Performance index ntawm methyl cellulose ether.MC rau mortar qhuav yuav tsum tau hmoov, cov dej tsis tshua muaj, thiab fineness ntawm 20% ~ 60% particle loj tsawg dua 63um.Fineness cuam tshuam rau solubility ntawm hydroxypropyl methyl cellulose ether.Coarse MC feem ntau yog granular thiab tuaj yeem yaj tau yooj yim hauv dej yam tsis muaj agglomerating, tab sis qhov kev sib cais nrawm yog qeeb heev, yog li nws tsis haum rau siv hauv mortar qhuav.Hauv mortar qhuav, MC yog sib cais ntawm cov sib sau ua ke, cov khoom ua kom zoo thiab cov khoom siv cementing xws li cov cement, thiab tsuas yog cov hmoov uas zoo txaus tuaj yeem zam qhov clumping ntawm methyl cellulose ether thaum sib tov nrog dej.Thaum MC ntxiv dej kom yaj agglomerate, nws nyuaj heev rau disperse thiab yaj nws.MC nrog ntxhib fineness tsis tsuas yog khib nyiab, tab sis kuj txo lub zog hauv zos ntawm mortar.Thaum xws li mortar qhuav yog tsim nyob rau hauv ib tug loj cheeb tsam, lub curing ceev ntawm lub zos mortar qhuav yog ho txo, uas ua rau tawg tshwm sim los ntawm txawv curing lub sij hawm.Rau cov neeg kho tshuab txau mortar, vim lub sij hawm sib tov luv luv, lub fineness yog siab dua.

Feem ntau hais lus, qhov siab dua qhov viscosity, qhov zoo dua cov dej tuav.Txawm li cas los xij, qhov siab dua qhov viscosity yog, qhov siab dua qhov hnyav molecular ntawm MC yog, thiab qhov kev ua tiav ntawm kev sib cais yuav txo qis, uas muaj kev cuam tshuam tsis zoo rau lub zog thiab kev tsim kho ntawm mortar.Qhov siab dua qhov viscosity, qhov pom tseeb dua cov nyhuv ntawm mortar, tab sis nws tsis yog proportional rau kev sib raug zoo.Qhov siab dua qhov viscosity, cov khib nyiab ntub yuav ntau nplaum, ob qho tib si kev tsim kho, kev ua haujlwm ntawm cov nplaum nplaum nplaum thiab siab adhesion rau cov khoom siv hauv paus.Tab sis nws tsis muaj txiaj ntsig los ua kom lub zog muaj zog ntawm cov mortar ntub dej.Hauv lwm lo lus, kev ua haujlwm los tiv thaiv sag tsis pom tseeb thaum tsim kho.Ntawm qhov tsis sib xws, qee qhov tsis muaj viscosity tab sis hloov kho methyl cellulose ethers muaj kev ua tau zoo hauv kev txhim kho lub zog ntawm cov khoom ntub dej.

Cov dej tuav ntawm HPMC kuj muaj feem xyuam rau qhov kub ntawm kev siv, thiab cov dej tuav ntawm methyl cellulose ether txo qis nrog qhov kub thiab txias.Tab sis nyob rau hauv cov ntaub ntawv siv tiag tiag, ntau qhov chaw ntawm cov mortar qhuav feem ntau yuav nyob rau hauv qhov kub thiab txias (siab tshaj 40 degrees) nyob rau hauv cov xwm txheej ntawm kev tsim kho nyob rau hauv kub substrate, xws li lub caij ntuj sov insolation ntawm sab nrauv phab ntsa putty plastering, uas feem ntau accelerates lub solidification ntawm. cement thiab qhuav mortar hardening.Qhov txo qis ntawm cov dej tuav tus nqi ua rau pom pom tseeb tias ob qho tib si constructability thiab cracking kuj raug cuam tshuam.Hauv qhov xwm txheej no, txo qhov cuam tshuam ntawm qhov kub thiab txias yog qhov tseem ceeb heev.Nyob rau hauv no hais txog, methyl hydroxyethyl cellulose ether additive yog tam sim no suav hais tias yog nyob rau hauv pem hauv ntej ntawm kev tsim kho technology.Txawm hais tias qhov nce ntawm methyl hydroxyethyl cellulose ntau npaum li cas (lub caij ntuj sov mis), kev tsim kho thiab kev sib tsoo tseem tsis tuaj yeem ua tau raws li qhov xav tau ntawm kev siv.Los ntawm qee qhov kev kho tshwj xeeb ntawm MC, xws li nce qib ntawm etherification, cov dej tuav cov nyhuv ntawm MC tuaj yeem tswj tau cov nyhuv zoo dua nyob rau hauv qhov kub thiab txias, kom nws tuaj yeem muab kev ua tau zoo dua hauv cov xwm txheej hnyav.

General HPMC muaj qhov kub thiab txias, tuaj yeem faib ua 60, 65, 75 hom.Rau cov khoom sib xyaw ua ke zoo tib yam siv cov dej xuab zeb cov lag luam tau zoo dua xaiv cov gel kub 75 HPMC.HPMC ntau npaum li cas yuav tsum tsis txhob siab dhau, siab dhau yuav ua rau kom cov dej xav tau ntawm mortar, yuav lo rau plaster, condensation lub sij hawm ntev dhau lawm, cuam tshuam rau kev tsim kho.Cov khoom khib nyiab sib txawv xaiv cov viscosity sib txawv ntawm HPMC, tsis txhob siv cov viscosity siab HPMC.Yog li, txawm hais tias cov khoom siv hydroxypropyl methyl cellulose yog qhov zoo, tab sis nws yog qhov zoo los xaiv qhov HPMC yog lub luag haujlwm tseem ceeb ntawm cov neeg ua haujlwm hauv chaw ua haujlwm.Tam sim no, muaj ntau tus neeg muag khoom tsis raug cai nyob rau hauv qhov sib xyaw nrog HPMC, qhov zoo yog qhov tsis zoo, lub chaw kuaj mob yuav tsum nyob rau hauv kev xaiv ntawm qee cov cellulose, ua ib qho kev sim zoo, xyuas kom muaj kev ruaj ntseg ntawm cov khoom mortar, tsis txhob ntshaw pheej yig, ua rau poob tsis tsim nyog.