Zotsatira za ufa wa mphira ndi cellulose mu tile zomatira

Tile zomatira ndi imodzi mwamalemba akuluakulu owuma pakalipano. Ili ndi mtundu wa simenti monga momwe gawo lalikulu la sime sikiriridwira, othandizira osungira madzi, othandizira oyamba, ma cerax ufa kapena owonjezera. kusakaniza. Nthawi zambiri, zimangofunika kusakanikirana ndi madzi mukamagwiritsa ntchito. Poyerekeza ndi simenti wamba ya simenti, imatha kukonza mphamvu yolumikizirana pakati pa zinthu zokumana nazo ndi gawo lapansi, limakhala ndi kukana kwapang'onopang'ono ndipo kuli ndi kukana kwamadzi kwambiri komanso kukana kutentha kwa madzi. Ndipo zabwino za kuwononga kwa thaw, kuthamanga kumayika matayala amkati ndi kunja, matabwa ena pansi, zokongoletsera, kukhitchini zomangira zomwe zimagwiritsidwa ntchito kwambiri.

Nthawi zambiri tikamaweruza ma tale omatira tile, sitimangomvera ntchito zake komanso luso lake lotsutsa, komanso samalani ndi mphamvu zake. Cellulose ether mu tile zomata sizimangokhudza zokonda za phokoso, ntchito yosalala monga mwamphamvu, ndi zina zolimbitsa thupi. Kukopa pa nthawi yotsegulira matayala

Pamene ufa wa mphira ndi ma cellulose a eleluse chitoliro chonyowa, deta ina ikuwonetsa kuti ufa wamphamvu umakhala ndi mphamvu ya sinrate, zomwe zimakhudza matope ambiri ndikukhazikitsa nthawi. Mavuto am'madzi a cellulose ndi okwera kuposa ufa wa mphira, komanso kuchuluka kwa cellulose pa mawonekedwe a matope azikhala opindulitsa mapangidwe a ma hydrogen pakati pa pansi ndi cellulose.

Mu matope onyowa, madzi mu matope amatuluka, ndipo ma cellulose amalemedwa pansi, ndipo filimu itayikidwa pamalo ocheperako mkati mwa mphindi 5, ndipo madzi ambiri amasungunuka pang'ono, ndikusamuka kwamadzi kumabweretsa cellulose yambiri ya ether.

Chifukwa chake, mawonekedwe a makanema a cellulose pamtunda ali pamwamba pa matope ali ndi mphamvu yayikulu pa matope.

1) Kanema wopangidwa ndi wowonda kwambiri ndipo udzasungunuka kawiri, osatha kuchepetsa madzi ndikuchepetsa mphamvu.

2) Kanema wopangidwa ndi wandiweyani, ndende ya ethel ether mu mavawor interstar imakwera, ndipo maonedwewo ndi okwera, motero sizophweka kuthyola filimuyo pomwe matailosi amapaka.

Itha kuwoneka kuti mawonekedwe omwe amapangidwa ndi mafilimu a cellulose ether ali ndi vuto lalikulu pa nthawi yotseguka. Mtundu wa ethel ether (hpmc, hemoc, MC, ndi cerection)

Kuphatikiza pa kutanthauzira zopindulitsa zomwe zatchulidwa pamwambapa ndi matope, cellulose ether ether amachepetsanso ma hydration kinetics of simenti. Zotsatira zobwezera izi zimachitika makamaka chifukwa cha Adsorption ya ma cellulose ethel mamolekyulu opanga ma mineral dongosolo ndi ma cell a celdroxide. Pa zopangidwa ndi mankhwala, sizimayesedwa kawirikawiri pa gawo loyambirira la mineral. Kuphatikiza apo, cellulose e ether imachepetsa kusuntha kwa ma ions (ca2 +, kotero ,.)

Mawonekedwe ndi gawo lina lofunikira, lomwe limayimira mawonekedwe a mankhwala a cellulose. Monga tafotokozera pamwambapa, maonedwewa amakhudzanso kuchuluka kwamadzi komanso kumapangitsanso kuti pakhale matope omwe mwatsopano. Komabe, maphunziro oyesera awona kuti mamasukidwe a cellulose ether ali pafupifupi pa simenti hydration kinetics. Kulemera kwa maselo sikuthandiza kwambiri pa hydration, ndipo kusiyana kwakukulu pakati pa zolemera zosiyana ndi 10min. Chifukwa chake, kulemera kwa matope si gawo lofunikira kuti liziwongolera simenti hydration.

"Kugwiritsa ntchito ma cellulose ether obzala matope owuma" kufotokozedwa kuti kubweza kwa cellulose etheluse ethel ethel ether kumatengera kapangidwe kake. Ndipo zomwe zidachitika kwambiri ndizomwe zimachitika kwa Mithylation ya methylation, yaying'ono yobwezeretsanso zotsatira za cellulose ether ether. Kuphatikiza apo, kubwezeretsanso kwa hydrophilic kumayimitsa (monga kulowetsa kwa Hec) kumatha mphamvu kuposa kwa Hydrophobic Statemit (monga kulowetsa mh, Michec, Mhdcc). Kubwezeretsanso zotsatira za cellulose ether kumakhudzidwa kwambiri ndi magawo awiri, mtundu ndi kuchuluka kwa magulu oyang'anira.

Kuyeserera kwa dongosolokunsonso kuti zomwe zili m'malo okakamizidwa zimagwira gawo lofunikira mu mphamvu yamakina a tiles. Kwa HPMC, kuchuluka kwa zowonjezera kumafunika kuonetsetsa kuwonongeka kwake kwamadzi ndikuwunika. Zomwe zili m'mitsempha zimatsimikiziranso mphamvu za HPMC. Kutentha kwa gel kumasankhanso ntchito kugwiritsidwa ntchito kwa HPMC. M'magulu ena, kuchuluka kwa magulu a methoxyl kumabweretsa zomwe zimapangitsa kuti mphamvu ituluke, pomwe kuchuluka kwa magulu a hydroxyprocroxyl kumabweretsa kuchepa kwa mphamvu. kukweza. Palinso zomwezo kuti mutsegule.

Kusintha kwamphamvu kwamakina pansi pa nthawi yotseguka ndikogwirizana ndi kutentha wamba. HPMC yokhala ndi methoxyl (DS) yokhala ndi hydroxypropoxyl (ms) ali ndi mawonekedwe abwino a filimuyo, koma imakhudza matope onyowa zinthu zonyowa.