Lub luag hauj lwm ntawm redispersible latex hmoov nyob rau hauv mortar
Tam sim no, raws li ntau yam tshwj xeeb qhuav hmoov mortar khoom tau maj mam txais thiab dav siv, cov neeg nyob rau hauv kev lag luam them nyiaj rau redispersible latex hmoov raws li ib tug ntawm cov tseem ceeb additives ntawm tshwj xeeb qhuav hmoov mortar, yog li ntau yam attributives tau maj mam tshwm sim. latex hmoov, multi-polymer latex hmoov, resin latex hmoov, dej raws li resin latex hmoov thiab lwm yam.
Lub microscopic zog thiab macroscopic kev ua tau zoo ntawmredispersible latex hmoovnyob rau hauv mortar yog kev koom ua ke, thiab ib co theoretical tau soj ntsuam. Cov txheej txheem kev ua haujlwm ntawm redispersible latex hmoov Redispersible latex hmoov yog los npaj cov polymer emulsion rau hauv ib qho kev sib tov uas tuaj yeem siv rau cov tshuaj tsuag kom qhuav los ntawm kev ntxiv cov khoom sib txawv, thiab tom qab ntawd ntxiv cov tshuaj tiv thaiv colloid thiab anti-caking tus neeg sawv cev los ua cov polymer daim ntawv tom qab tshuaj tsuag kom qhuav. Dawb-flowing hmoov redispersible nyob rau hauv dej. Lub redispersible latex hmoov yog faib nyob rau hauv tusyees stirred qhuav mortar. Tom qab lub mortar yog nplawm nrog dej, cov hmoov polymer yog redispersed rau hauv lub freshly tov slurry thiab emulsified dua; vim lub hydration ntawm cov cement, nto evaporation thiab nqus ntawm lub hauv paus txheej, lub pores nyob rau hauv lub mortar yog dawb. Kev noj cov dej tas mus li thiab qhov muaj zog alkaline ib puag ncig muab los ntawm cov cement ua cov latex particles qhuav los ua ib qho dej-insoluble nruam zaj duab xis hauv mortar. Cov yeeb yaj kiab txuas ntxiv no yog tsim los ntawm kev sib xyaw ntawm ib qho kev sib cais ntawm cov emulsion rau hauv lub cev homogeneous. Nws yog qhov muaj nyob ntawm cov latex films uas tau muab faib rau hauv cov polymer hloov mortar uas ua rau cov polymer hloov mortar kom tau txais cov yam ntxwv uas cov cement mortar tsis tuaj yeem muaj: vim nws tus kheej-stretching mechanism ntawm latex zaj duab xis, nws tuaj yeem muab tso rau hauv lub hauv paus los yog mortar ntawm qhov sib cuam tshuam ntawm polymer hloov mortar thiab lub hauv paus, cov nyhuv no tuaj yeem txhim kho qhov sib txawv ntawm cov mortar thiab kev ua haujlwm tshwj xeeb. hauv paus xws li high-density ceramic vuas thiab polystyrene boards; Cov nyhuv no nyob rau hauv lub mortar tuaj yeem ua rau tag nrho, hauv lwm lo lus, lub zog cohesive ntawm lub mortar yog txhim kho, thiab raws li cov nyiaj redispersible latex hmoov nce, lub zog ntawm daim ntawv cog lus ntawm mortar thiab lub hauv paus pob zeb tau txhim kho zoo; High Lub xub ntiag ntawm saj zawg zog thiab elastic polymer domains zoo heev txhim kho kev sib raug zoo kev ua tau zoo thiab saj zawg zog ntawm lub mortar, thaum lub elastic modulus ntawm lub mortar nws tus kheej txo qis heev, qhia tau hais tias nws yooj tau txhim kho. Latex zaj duab xis pom nyob rau hauv lub mortar hauv polymer hloov cement mortar ntawm ntau lub hnub nyoog. Cov zaj duab xis tsim los ntawm cov latex yog faib nyob rau hauv ntau txoj hauj lwm nyob rau hauv lub mortar, nrog rau lub hauv paus-mortar interface, nruab nrab ntawm lub pores, nyob ib ncig ntawm lub pore phab ntsa, nruab nrab ntawm cov cement hydration khoom, nyob ib ncig ntawm cov cement hais, nyob ib ncig ntawm lub aggregate, thiab aggregate-mortar interface. Qee cov yeeb yaj kiab latex faib rau hauv mortar hloov kho los ntawm cov hmoov polymer uas muaj peev xwm ua kom tau cov khoom uas cov cement mortar tsis tuaj yeem muaj: cov latex zaj duab xis tuaj yeem txuas cov kab nrib pleb ntawm lub hauv paus-mortar interface thiab tso cai rau cov kab nrib pleev kom zoo. Txhim kho qhov sealability ntawm mortar. Kev txhim kho ntawm lub zog cohesive ntawm mortar: Lub xub ntiag ntawm cov khoom siv tau yooj yim thiab muaj zog heev ntawm cov khoom siv polymer txhim kho qhov yooj thiab elasticity ntawm mortar, muab cohesion thiab dynamic cwj pwm mus rau lub cev pob txha. Thaum siv quab yuam, microcrack tsim yog ncua kom txog thaum muaj kev ntxhov siab ntau dua vim tias kev txhim kho yooj thiab elasticity. Cov interwoven polymer domains kuj cuam tshuam cov coalescence ntawm microcracks rau hauv cov kab nrib pleb. Yog li ntawd, redispersible latex hmoov tsub kom qhov tsis ua hauj lwm kev nyuaj siab thiab tsis ua hauj lwm strain ntawm cov khoom. Kev hloov pauv ntawm cov polymer rau cov cement mortar ua rau ob qho tib si tau txais txiaj ntsig zoo, kom cov polymer hloov mortar tuaj yeem siv rau ntau lub sijhawm tshwj xeeb. Tsis tas li ntawd, vim muaj qhov zoo ntawm cov hmoov sib tov qhuav hauv kev tswj kom zoo, kev tsim kho kev lag luam, kev cia thiab kev tiv thaiv ib puag ncig, redispersible latex hmoov muab cov txheej txheem zoo rau kev tsim cov khoom tshwj xeeb qhuav mortar.
Raws li cov txheej txheem ntawm kev txiav txim ntawm redispersible polymer hmoov nyob rau hauv mortar, peb tau ua ib co piv txwv kev ntsuam xyuas los xyuas qhov kev ua tau zoo ntawm lwm yam khoom tam sim no nyob rau hauv kev ua lag luam, tseem hu ua latex hmoov, nyob rau hauv mortar. 1. Cov ntaub ntawv nyoos thiab cov txiaj ntsig kev xeem 1.1 Raw material cement: Conch Brand 42.5 Ordinary Portland Cement Sand: River Sand, Silicon Content 86%, Fineness 50-100 Mesh Cellulose Ether: Domestic Viscosity 30000-35000mpas (Brookfield Viscometer, heavy 2 calcium carbonate) hmoov, fineness yog 325 mesh Latex hmoov: VAE-raws li redispersible latex hmoov, Tg tus nqi yog -7 ° C, ntawm no yog hu ua: redispersible latex hmoov Ntoo fiber: ZZC500 ntawm JS tuam txhab Commercially muaj latex hmoov: ib tug coj mus muag khoom latex hmoov, hu rau ntawm no: coj mus muag muaj latex hmoov 97. (23 ± 2) ° C, txheeb ze av noo (50 ± 5)%, kuaj Lub voj voog cua ceev hauv cheeb tsam tsawg dua 0.2m / s. Moulded nthuav polystyrene board, bulk ntom yog 18kg / m3, txiav rau hauv 400 × 400 × 5mm. 2. Cov txiaj ntsig kev xeem: 2.1 Tensile lub zog nyob rau hauv lub sijhawm sib txawv: Cov qauv tau ua raws li txoj kev sim ntawm mortar tensile bond zog hauv JG149-2003. Cov txheej txheem kho ntawm no yog: tom qab cov qauv tsim, nws raug kho rau ib hnub raws li cov txheej txheem ntawm chav kuaj, thiab tom qab ntawd muab tso rau hauv qhov cub 50-degree. Thawj lub lim tiam ntawm kev sim yog: muab tso rau hauv qhov cub 50-degree kom txog rau thaum hnub thib rau, coj nws tawm, lo lub taub hau rub tawm, Hnub 7, ib txheej ntawm rub tawm lub zog tau sim. Qhov kev sim nyob rau lub lim tiam thib ob yog: muab tso rau hauv qhov cub 50-degree kom txog rau thaum hnub 13th, tshem tawm, lo lub taub hau rub tawm, thiab sim ib txheej ntawm rub tawm lub zog rau hnub 14th. Lub lim tiam thib peb, lub lim tiam plaub. . . thiab lwm yam.
Los ntawm cov txiaj ntsig, peb tuaj yeem pom tias lub zog ntawm lubredispersible latex hmoovnyob rau hauv mortar nce thiab tswj raws li lub sij hawm nyob rau hauv lub kub kub ib puag ncig nce, uas yog tib yam li cov latex zaj duab xis uas cov redispersible latex hmoov yuav tsim nyob rau hauv lub mortar Txoj kev xav yog zoo ib yam, lub sij hawm ntev cia, cov latex zaj duab xis ntawm cov latex hmoov yuav ncav cuag ib tug tej yam ceev, yog li xyuas kom meej lub adhesion ntawm lub hauv paus tshwj xeeb .PS ntawm mortar. Ntawm qhov tsis sib xws, cov khoom lag luam muaj latex hmoov 97 muaj lub zog qis dua vim nws khaws cia rau hauv qhov chaw kub kub rau lub sijhawm ntev. Lub zog puas tsuaj ntawm cov hmoov latex dispersible rau EPS board tseem zoo li qub, tab sis lub zog puas tsuaj ntawm cov khoom lag luam muaj latex hmoov 97 rau EPS pawg thawj coj saib yog zuj zus tuaj.
Feem ntau hais lus, cov khoom lag luam muaj latex hmoov thiab redispersible latex hmoov muaj cov txheej txheem sib txawv ntawm kev ua, thiab redispersible latex hmoov, uas tsim ib zaj duab xis nyob rau hauv ntau qhov chaw ntawm lub mortar, ua raws li ib tug thib ob gelling khoom los txhim kho lub cev lub cev ntawm lub mortar. Lub mechanism ntawm qhov kev txiav txim ntawm kev ua tau zoo yog inconsistent.
Lub sij hawm xa tuaj: Plaub Hlis-25-2024