1 Kuyamba
Zodabwitsa za CEELARD NTHAWI ZONSE PAKATI PAMODZI YOSAVUTA KWA DZIKO LAPANSI, lomwe limapangidwa ndi simenti monga ma Cemential Cearting Center, Othandizira Madzi, Ogwiritsa Ntchito Oyambirira, Osakanikirana 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, ndipo limakhala ndi kukana kwabwino komanso madzi abwino ndi kukana madzi. Zimagwiritsidwa ntchito makamaka popanga zokongoletsera monga kumanga matabwa amkati ndi kunja, zotupa pansi. Pakali pano pali zinthu zolumikizana kwambiri zogwiritsidwa ntchito kwambiri.
Nthawi zambiri tikamaweruza ma tale omatira tile, sitimangomvera ntchito zake komanso luso lake lotsutsa, komanso samalani ndi mphamvu zake. Cellulose ether m'matumbo omata sizimangokhudza zokonda za phokoso, kugwira ntchito molunjika, mpeni womata, ndi zina zolimbitsa thupi
2. Zomwe zimayambitsa nthawi yotseguka ya tile
Pamene ufa wa mphira ndi ma cellulose a eleluse a matope onyowa, mitundu ina ya data imawonetsa mphamvu ya rabade yolumikizira mafuta a sitemer, zomwe zimakhudza matope ndi kukhazikitsa 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 padziko lapansi ali pamwamba pa matope ali ndi mphamvu yayikulu pakuchita kwa matope. 1) Kanema wopangidwa ndi wowonda kwambiri ndipo udzasungunuka kawiri, womwe sungachepetse 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)
3. Kukopa pa mphamvu yojambula
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 +, 172-.
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.
Kubwezera kwa cellulose emesulose kumatengera kapangidwe kake, ndipo chochita chofananira chimati, chifukwa chac, chokwera kwambiri cha methylation, chovuta chobwezeretsa za cellulose. 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 kwathu mwadongosolonso kunapezekanso kuti zomwe zili muzolowa zimachita gawo lofunikira mu mphamvu yamakina a tiles. Tinawunikira magwiridwe antchito a HPMC yokhala ndi madigiriini osiyanasiyana azomatira tile akumata, ndikuyesa mphamvu ya cellulose kukhala ndi magulu osiyanasiyana pamasewera osiyanasiyana.
Poyesedwa, timaganizira za HPMC, yomwe ndi chiyero chochuluka, chifukwa chake tiyenera kuyika zithunzi ziwirizo limodzi. Kwa HPMC, zimafunikira kuyamwa kwakanthawi kuti zitsimikizire kusungunuka kwa madzi ndikuwunika. Tikudziwa zomwe zili m'malo a magalamure zimakondanso kutentha kwa gelc, komwe kumasankhanso ntchito kwa HPMC. Mwanjira imeneyi, gulu lomwe lili ndi HPMC lomwe limagwiritsidwa ntchito limagwiritsidwanso ntchito. Munthawi imeneyi, momwe mungagwiritsire ntchito memoxy ndi hydroxypropoxy kuti mukwaniritse zabwino zomwe zili zofunikira ndizomwe zili mu kafukufuku wathu. Chithunzi 2 chikuwonetsa kuti mkati mwa mitundu ina, kuchuluka kwa magulu a methoxyl kumabweretsa chidwi chotsika, pomwe kuchuluka kwa magulu a hydroxyprovoyl kumabweretsa kuwonjezeka kwamphamvu. 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.
Post Nthawi: Jan-09-2023