Cov hmoov txhuv nplej siab ether yog cov ntsiab lus dav dav rau cov chav kawm ntawm cov hmoov txhuv nplej siab hloov pauv uas muaj ether bonds hauv cov molecule, tseem hu ua etherified starch, uas yog siv dav hauv tshuaj, zaub mov, textile, papermaking, tshuaj niaj hnub, roj av thiab lwm yam lag luam. Niaj hnub no peb feem ntau piav qhia lub luag haujlwm ntawm cov hmoov txhuv nplej siab ether hauv mortar.
Taw qhia rau Starch Ether
Qhov ntau thiab siv ntau tshaj yog qos yaj ywm starch, tapioca starch, pob kws hmoov txhuv nplej siab, nplej hmoov txhuv nplej siab, thiab lwm yam. Piv nrog cereal starch nrog cov roj ntau dua thiab cov ntsiab lus protein, cov hauv paus qoob loo cov hmoov txhuv nplej siab xws li qos yaj ywm thiab tapioca starch yog cov ntshiab dua.
Starch yog ib qho polysaccharide macromolecular compound uas muaj cov piam thaj. Muaj ob hom molecules, linear thiab branched, hu ua amylose (kwv yees 20%) thiab amylopectin (kwv yees li 80%). Txhawm rau txhim kho cov khoom ntawm cov hmoov txhuv nplej siab siv hauv cov khoom siv hauv tsev, cov txheej txheem ntawm lub cev thiab tshuaj siv tau los hloov kho kom nws cov khoom tsim nyog rau ntau lub hom phiaj ntawm cov khoom siv hauv tsev.
Etherified starch suav nrog ntau hom khoom. Xws li carboxymethyl starch ether (CMS), hydroxypropyl starch ether (HPS), hydroxyethyl starch ether (HES), cationic starch ether, thiab lwm yam. Feem ntau siv hydroxypropyl starch ether.
Lub luag haujlwm ntawm hydroxypropyl starch ether hauv mortar
1) Thicken lub mortar, nce lub anti-sagging, anti-sagging thiab rheological zog ntawm lub mortar
Piv txwv li, nyob rau hauv kev tsim kho ntawm pobzeb nplaum, putty, thiab plastering mortar, tshwj xeeb tshaj yog tam sim no hais tias txhua yam tshuaj tsuag yuav tsum muaj fluidity, xws li nyob rau hauv gypsum-raws li mortar, nws yog ib qho tseem ceeb tshwj xeeb tshaj yog (tshuab-txhaj tshuaj gypsum yuav tsum tau muaj fluidity tab sis yuav ua rau loj sagging. , starch Ether tuaj yeem ua rau qhov tsis txaus).
Fluidity thiab sag resistance feem ntau tsis sib haum, thiab qhov fluidity ntau ntxiv yuav ua rau txo qis hauv sag resistance. mortar nrog rheological zog tuaj yeem daws tau qhov tsis sib xws, uas yog, thaum siv lub zog sab nraud, qhov viscosity txo qis, txhim kho kev ua haujlwm thiab lub zog, thiab thaum lub zog sab nraud raug tshem tawm, qhov viscosity nce thiab sagging kuj zoo tuaj.
Rau qhov tam sim no sib txawv ntawm thaj tsam ntawm cov pobzeb, ntxiv cov hmoov txhuv nplej siab ether tuaj yeem txhim kho cov nplaum tiv thaiv ntawm cov nplais nplaum.
2) Lub sijhawm qhib sijhawm txuas ntxiv
Rau cov nplais nplaum, nws tuaj yeem ua tau raws li qhov yuav tsum tau ua ntawm cov pobzeb tshwj xeeb nplaum (Class E, 20min txuas mus rau 30min kom ncav cuag 0.5MPa) uas txuas ntxiv lub sijhawm qhib.
Txhim kho cov khoom nto
Cov hmoov txhuv nplej siab ether tuaj yeem ua rau saum npoo ntawm gypsum puag thiab cement mortar smooth, yooj yim rau kev thov, thiab muaj cov nyhuv zoo nkauj. Nws yog ib qho tseem ceeb heev rau plastering mortar thiab nyias txheej zoo nkauj mortar xws li putty.
Mechanism ntawm kev ua ntawm hydroxypropyl starch ether
Thaum starch ether dissolves nyob rau hauv dej, nws yuav uniformly dispersed nyob rau hauv lub cement mortar system. Txij li cov hmoov txhuv nplej siab ether molecule muaj cov qauv sib txuas thiab tsis zoo, nws yuav nqus tau cov cement zoo thiab ua haujlwm zoo li tus choj hloov mus txuas rau cov cement, yog li muab cov txiaj ntsig loj dua ntawm cov slurry tuaj yeem txhim kho kev tiv thaiv sag lossis los tiv thaiv plam. nyhuv.
Qhov sib txawv ntawm hydroxypropyl starch ether thiab cellulose ether
1. Cov hmoov txhuv nplej siab ether tuaj yeem txhim kho cov khoom tiv thaiv sag thiab tiv thaiv plam ntawm mortar
Cellulose ether feem ntau tsuas tuaj yeem txhim kho cov viscosity thiab dej tuav ntawm lub cev tab sis tsis tuaj yeem txhim kho cov khoom tiv thaiv sagging thiab tiv thaiv plam.
2. Thickening thiab viscosity
Feem ntau, cov viscosity ntawm cellulose ether yog hais txog kaum tawm txhiab, thaum lub viscosity ntawm starch ether yog ob peb puas mus rau ob peb txhiab, tab sis qhov no tsis tau txhais hais tias starch ether muaj zog huab cua-entraining khoom, thaum starch ether tsis muaj huab cua-entraining khoom. .
5. Molecular qauv ntawm cellulose ether
Txawm hais tias ob qho tib si hmoov txhuv nplej siab thiab cellulose yog tsim los ntawm cov piam thaj molecules, lawv txoj kev sib txawv yog txawv. Kev taw qhia ntawm tag nrho cov piam thaj molecules hauv cov hmoov txhuv nplej siab yog tib yam, thaum cov cellulose tsuas yog qhov sib txawv, thiab kev taw qhia ntawm txhua qhov qabzib molecule uas nyob ib sab yog qhov sib txawv. Qhov sib txawv ntawm cov qauv no kuj txiav txim siab qhov sib txawv ntawm cov khoom ntawm cellulose thiab starch.
Lub sij hawm xa tuaj: Plaub Hlis-10-2023