Yuav ua li cas xaiv hydroxypropyl methylcellulose rau plaster mortar?

Tus nqi pH dav dav ntawm cov khoom gypsum yog acidic lossis nruab nrab. Tam sim no muaj ob hom qib kev tsim khohydroxypropyl methylcellulosenyob rau hauv kev ua lag luam: cellulose qeeb-yaj thiab cellulose tam sim ntawd (S). cellulose tam sim ntawd tsis haum rau gypsum systems. Cov khoom, qhov solubility tsis zoo heev nyob rau hauv acidic lossis nruab nrab mob, thiab qeeb-yaj hydroxypropyl methylcellulose tuaj yeem yaj hauv cov khoom gypsum, tab sis qeeb-yaj cellulose muaj qhov tsis zoo, nws yooj yim rau agglomerate (thaum gypsum Tom qab lub mortar raug do rau ntawm phab ntsa rau lub sijhawm luv luv, cov pob me me feem ntau tshwm sim ntawm qhov chaw). Tam sim no, hauv cov khoom gypsum, tshwj xeeb tshaj yog hauv tshuab-tshuaj tsuag gypsum mortar, nws yog qhov yuav tsum tau tias cellulose ether tuaj yeem tawg tag nrho thiab yaj hauv lub sijhawm luv luv, uas yuav tsum tau peb ua qhov kev tshawb fawb tob tob ntawm cov txheej txheem qeeb-yaj cellulose ether ntau lawm. Kev kho qhov chaw (tsis yog qhov hu ua ntxiv ntawm lwm cov khoom ntxiv hauv qib cellulose ether), yog li ntawd kom hloov kho rau lub cev gypsum mortar system. Hydroxypropyl methylcellulose ether nrog kev kho qhov chaw tob tuaj yeem muaj lub sijhawm yaj ruaj khov thiab cov khoom siv kho tshuab zoo hauv gypsum mortar, thiab tuaj yeem txhim kho qhov kev sib npaug thiab kev ua tiav ntawm mortar.

Feem ntau, cov tshuaj gypsum uas siv tshuab txau siv cov hydroxypropyl methylcellulose ether uas muaj viscosity tsawg ntawm 20,000 thiab 75,000, thiab feem ntau ntxiv 0.2% txog 0.4%. Lub sijhawm teeb tsa ntawm cov tshuaj gypsum uas siv tshuab txau yog tswj tau li 1 teev. Peb siv cov tshuaj gypsum mortar yield stress, plastic viscosity, thixotropy, rheology thiab consistency ntawm slurry los txiav txim siab qhov ua tau zoo ntawm cov khoom gypsum mortar.

Peb xav txog kev tswj xyuas zoo ntawm cov txheej txheem calcining gypsum desulfurization, cov khoom sau (cement, cov khoom sib xyaw zoo, cov hmoov calcium hnyav) thiab cov khoom sib xyaw (tuaj yeem siv rau hauv cov hmoov disperse latex, hydroxypropyl methyl cellulose ether, nthuav dav perlite, gypsum retarder) Kev xaiv cov mis tag nrho cov khoom tsim nyog.

Hydroxypropyl methyl cellulose etherrau gypsum mortar muaj kev ntshiab siab thiab ua haujlwm tau zoo, thiab tau txais kev qhuas dav los ntawm cov neeg siv khoom gypsum mortar.