HPMC hauv gypsum plaster

Hydroxypropyl Methylcellulose (HPMC)yog ib qho non-ionic cellulose ether, uas yog siv dav hauv cov ntaub ntawv siv hauv tsev, tshwj xeeb tshaj yog hauv cov mortar qhuav sib xyaw, cov nplaum pobzeb, hmoov putty thiab cov khoom gypsum.

1. Txheej txheem cej luam ntawm gypsum plaster

Gypsum plaster yog ib yam khoom siv rau phab ntsa uas siv gypsum ua cov khoom siv cement tseem ceeb, uas muaj qhov zoo ntawm kev tsim kho yooj yim, qhuav sai thiab tsis ua rau ib puag ncig puas tsuaj. Raws li qhov sib piv ntawm cov khoom ntxiv sib txawv, cov khoom uas muaj cov yam ntxwv sib txawv xws li kev pleev tes, kev txau gypsum thiab kev pleev tus kheej gypsum tuaj yeem npaj tau. Txawm hais tias gypsum plaster ntuj muaj qee qhov kev nplaum thiab kev ua kom tawv, nws tseem muaj teeb meem xws li kev khaws dej tsis zoo, yooj yim tawg thiab kev tsim kho tsis zoo thaum lub sijhawm tsim kho, yog li nws yog qhov tsim nyog ntxiv cov khoom hloov kho kom zoo kom txhim kho nws cov kev ua tau zoo.

2. Txoj kev ua haujlwm ntawm HPMC

Ua ib yam khoom siv polymer uas yaj tau zoo heev, HPMC feem ntau txhim kho kev ua tau zoo ntawm gypsum plaster los ntawm cov hauv qab no:

2.1. Kev khaws dej kom zoo dua:

HPMC muaj peev xwm khaws dej zoo thiab tuaj yeem txo qhov dej poob ntawm gypsum thaum lub sijhawm tsim kho. Qhov no yog qhov tseem ceeb rau kev ncua sijhawm teeb tsa thawj zaug ntawm gypsum thiab txhim kho lub sijhawm ua haujlwm tsim kho, tshwj xeeb tshaj yog rau cov txheej txheem kub lossis cov txheej txheem nqus dej siab, uas tuaj yeem tiv thaiv kev tawg thiab txo qis kev nplaum.

2.2. Kev tsim kho thiab kev ua haujlwm zoo dua:

HPMC tuaj yeem ua rau kom muaj kev sib xws thiab lubricity ntawm cov slurry, ua rau cov gypsum plaster du thaum lub sijhawm phab ntsa plastering thiab leveling, txo cov cuab yeej tsis kam thiab txhim kho kev ua haujlwm ntawm kev tsim kho. Rau cov tshuab txau gypsum, HPMC yog qhov tseem ceeb rheology regulator.

2.3. Kev ua tau zoo dua tiv thaiv kev sagging:

Hauv kev tsim cov txheej tuab lossis kev tsim phab ntsa ntsug, kev ntxiv HPMC tuaj yeem txhim kho qhov kev ua tau zoo tiv thaiv kev sagging ntawm plaster, ua rau nws tswj tau qhov zoo ntawm cov duab thiab tsis yooj yim rau swb.

2.4. Kev ruaj khov ntawm npuas thiab kev sib kis zoo ib yam:

Cov npuas me me yooj yim tsim thaum lub sijhawm sib tov. HPMC tuaj yeem ua kom cov npuas no ruaj khov, uas yog qhov zoo rau kev txo qhov ceev ntawm cov plaster thiab txhim kho kev ua haujlwm rwb thaiv tsev, tab sis yuav tsis cuam tshuam rau nws cov khoom siv kho tshuab.

2.5. Kev sib txuas zoo dua:

HPMC tuaj yeem tsim cov qauv zaj duab xis yooj ywm ntawm gypsum thiab cov substrate, yog li txhim kho kev ua haujlwm sib txuas thiab txo cov teeb meem zoo xws li kev plhaub thiab tev tawv.

3. Cov lus qhia txog kev siv thiab kev noj tshuaj HPMC

HPMC feem ntau yog ntxiv rau hauv gypsum qhuav sib tov ua hmoov thiab sib tov tag nrho nrog lwm yam khoom (xws li cov khoom sib xyaw ua ke, xuab zeb quartz, retarder, thiab lwm yam) los ntawm cov txheej txheem sib tov qhuav. Nws cov koob tshuaj feem ntau yog tswj ntawm 0.1% ~ 0.3% (raws li cov khoom qhuav), thiab qhov piv txwv tshwj xeeb yuav tsum tau ua kom zoo dua thiab kho raws li cov yam ntxwv xws li cov mis khoom, txoj kev tsim kho thiab cov huab cua.

Thaum txau gypsum, txhawm rau txhim kho kev tsim kho kom du thiab muaj peev xwm nqus tau, HPMC nrog qib hloov pauv siab dua thiab viscosity tsim nyog (xws li 50,000100,000 mPa.s) tuaj yeem xaiv tau, thaum siv tes ua gypsum, viscosity nruab nrab (20,00060,000 mPa.s) ntau yam tuaj yeem xaiv tau los xav txog kev tsim kho thiab cov khoom tiv thaiv sagging.

4. Kev ceev faj thiab kev cov nyom

Txawm hais tias HPMC tau coj ntau yam zoo rau gypsum plaster, cov ntsiab lus hauv qab no tseem yuav tsum tau sau tseg thaum lub sijhawm tsim qauv thiab siv:

Kev sib kis sib xws: HPMC yuav tsum tau tawg tag nrho kom tsis txhob muaj kev sib sau ua ke, thiab nws cov txiaj ntsig faib tawm tuaj yeem txhim kho los ntawm kev sib tov qhuav lossis ua ntej yaj.

Kev sib raug zoo nrog lwm cov khoom ntxiv: HPMC yuav tsum ua haujlwm sib koom ua ke nrog cov tshuaj retarders, cov dej txo, cov neeg sawv cev nthuav dav, thiab lwm yam kom tsis txhob muaj kev tsis zoo.

Kev xaiv viscosity tsim nyog: viscosity siab tsis yog qhov siab dua qhov zoo dua. viscosity siab dhau yuav ua rau muaj teeb meem sib tov, tsis muaj zog fluidity, thiab txawm tias cuam tshuam rau kev ua haujlwm ntawm lub twj tso kua mis.

Nrog rau kev tsim cov ntaub ntawv tsim vaj tsev ntsuab thiab kev nrov npe ntawm kev tsim kho tshuab, cov kev xav tau kev ua tau zoo rau gypsum plaster kuj nce ntxiv. HPMC yuav txuas ntxiv ua lub luag haujlwm tseem ceeb hauv kev tswj hwm kev ua tau zoo ntawm kev tsim kho thiab txhim kho kev ruaj khov zoo. Tib lub sijhawm, cov khoom cellulose ether hloov kho ntau dua yuav raug siv ua ke nrogHPMCkom ua tau raws li cov kev xav tau tshwj xeeb, xws li HPMC / HEMC compounding system thiab multifunctionalhmoov latex uas yaj tau dua tshiabkev sib xyaw ua ke, los pab cov khoom gypsum txhim kho hauv kev coj ua haujlwm siab thiab ntau yam kev ua haujlwm.