I roto i te whakamahi ohydroxypropyl methyl cellulose HPMC, i te nuinga o te wa ka kitea kua wehea kia rua nga momo: te whakakore tere me te puhoi. Kia mohio tatou ki te rereketanga i waenga i te whakakore tere me te puhoi te whakakore o te hydroxypropyl methyl cellulose.
Ko te HPMC Inamata e pa ana ki te whakamahi i te kaihoko whakawhiti mo te maimoatanga mata i roto i te tukanga whakaputa, kia tere te marara a HPMC ki te wai matao, engari ehara i te tino otinga, na roto i te whakakorikori kakahu, ka piki haere te pokey, ara, te whakakorenga;
Ka taea hoki te kii ko te HPMC puhoi whakarewa he hua rewa wera. Ka tae ki te wai matao, ka tere te marara ki te wai wera. Ma te whakakorikori i te taurite, ka heke te pāmahana o te otinga ki tetahi pāmahana. (Kei te 60°C te mahana o to tatou reera), ka puhoi te ahua o te potata tae noa ki te wa ka puta mai he kiri maramara me te piri.
Anei te wehewehenga o te otinga tere me te otinga puhoi. Mena kei a koe etahi patai mo tenei matauranga, ka taea ano e koe te korero mai ki a maatau.
Hydroxypropyl methyl celluloseHPMCka whakaroa i te whakamakuku sima
Ko te taapiri i te hydroxypropyl methyl cellulose ki te sima ka puhoi te whakamakuku. Na he aha taau e mohio ana mo te mahi? Me titiro ki te hydroxypropyl methyl cellulose ki te whakaroa i te whakamakuku sima. Tikanga.
1. Te whakapae o te raruraru nekehanga katote
I whakapae matou ko te hydroxypropyl methyl cellulose ka piki ake te pokey o nga otinga pore, ka aukati i te tere o te nekehanga katote, me te whakaroa i te whakamakuku o te ciment. Heoi, he kaha ake te kaha o nga etera cellulose pokey iti i roto i tenei whakamatautau ki te whakaroa i te whakamakuku ciment. No reira, he muhu tenei whakaaro. Pourchez et al. pohehe hoki tenei whakapae. Inaa, he poto rawa te wa o te heke katote, te heke ranei, te ahua nei kaore i te rerekee ki te whakaroa o te whakamakuku sima.
2. Paheketanga kawakore
Ko nga Polysaccharides ka ngawari ki te whakaheke i raro i nga tikanga kawakore ki te whakaputa i nga waikawa waikawa hydroxyl carboxylic e whakaroa ana i te whakamakuku sima. No reira, ko te whakaroa o te whakamakuku o te hydroxypropyl methyl cellulose na tona paheketanga i roto i nga slurries ciment alkaline ki te hanga waikawa hydroxycarboxylic. Heoi, Pourchez et al. i kitea he tino pumau nga ethers cellulose i raro i nga tikanga kawakore, he iti noa iho te whakaheke, a he iti te paanga o nga hua whakaheke ki te whakaroa o te whakamakuku sima.
3, te adsorption
Adsorption taea e hydroxypropyl methyl cellulose poraka sima hydration te tino take ko e ka adsorbed maha tāpiritanga organic i runga i matūriki sima me hua hydration, ārai i te memeha o matūriki sima me te whātioatanga o hua hydration, kia rite ki te whakaroa i te hydration me te tōhau o sima. Pourchez et al. i kitea ko te cellulose ethers ka uru ki runga i nga mata o nga hua whakamakuku penei i te konupūmā waihā, te CSH gel me te calcium aluminate hydrate, engari karekau i te tere te uru ki nga wahanga ettringite me te kore wai. Ano, i roto i te take o te cellulose ether, ko te kaha adsorption o HEC he kaha ake i tera o te pupuhi MC. Ko te iti o te ihirangi o te hydroxyethyl i HEC, hydroxypropyl ranei i rotoHPMC, ko te kaha ake o te kaha o te whakauru: mo nga hua whakamaarama, he kaha ake te kaha o te whakauru o te konupūmā hydroxide i te CSH. Ko etahi atu tātaritanga e whakaatu ana ko te kaha o te whakaurunga o nga hua hydration me te cellulose ether e pa ana ki te whakaroa o te hydration ciment: ko te kaha ake o te whakauru, ka tino kitea te whakaroa, engari he ngoikore te ettringite adsorption o te cellulose ether, engari ko tona hanganga, engari he tino roa tenei. Ether cellulose o tricalcium silicate me ona hua hydration he adsorption kaha, te reira mārama whakaroa te tukanga hydration o te wāhanga silicate, he tino iti te nui adsorption o ettringite, engari whakaroa te hanga ettringite he kitea, no te mea o te roa o te hanganga ettringite kua pangia e Ca 2 + toenga i roto i te otinga, he toronga o te cellulose. I haere tonu te whakamakuku silicate.
He hydroxypropyl methyl cellulose whakaroa te maataapono hydration sima enei. Ko te tumanako ma tenei matauranga ka mohio nga tangata katoa ki te mahi o te hua me te pai ake o te whakamahi.
Te wa tuku: Apr-26-2024