Udindo wa HPMC mu Drymix Mortars

Hydroxypropyl methylcellulose (HPMC) ndi chowonjezera chomwe chimagwiritsidwa ntchito kwambiri mu matope a drymix. Ndiwochokera ku cellulose yomwe imasungunuka m'madzi ndipo imatha kupanga zinthu ngati gel ikawonjezeredwa m'madzi. Katunduyu amapangitsa HPMC kukhala yolimba kwambiri komanso yomangirira, ndichifukwa chake imagwiritsidwa ntchito m'mafakitale ambiri monga chakudya, zodzoladzola, ndi zomangamanga.

Mu matope a drymix, HPMC imagwiritsidwa ntchito ngati rheology modifier, madzi osungira madzi, ndi obalalitsa. Zimakhudza kwambiri ubwino ndi ntchito ya matope a drymix. HPMC nthawi zambiri imawonjezeredwa pang'ono, nthawi zambiri 0.1% mpaka 0.5% potengera kulemera kwa simenti mumtondo wowuma.

Imodzi mwa ntchito zazikulu za HPMC mu matope a drymix ndikuwongolera magwiridwe antchito a matope. Zimagwira ntchito ngati rheology modifier powonjezera kukhuthala kwa kusakaniza, kuti zikhale zosavuta kugwira ntchito. Izi ndizofunikira makamaka pamatope a drymix omwe amagwiritsidwa ntchito popangira matayala kapena pansi, pomwe kusasinthasintha kwa matope ndikofunikira pakuyika bwino.

Ntchito ina yovuta ya HPMC mu matope a drymix ndi kuthekera kwake kusunga madzi. Ikasakanikirana ndi madzi, HPMC imapanga chinthu chonga gel chomwe chimatsekera mamolekyu amadzi mkati mwake. Katunduyu amathandizira kuti matope a drymix azikhala onyowa, omwe ndi ofunikira pakuchiritsa bwino ndikuyika matope. Zimathandizanso kuchepetsa kuchepa komanso kusweka kwa matope.

HPMC imagwiranso ntchito ngati dispersing wothandizila mu drymix matope. Zimathandiza kuthyola tinthu tating'onoting'ono, zomwe zimapangitsa kuti zikhale zosavuta kusakaniza mofanana mumatope. Katunduyu ndi wofunikira kwambiri pamadontho a drymix omwe amakhala ndi zinthu zingapo, monga mchenga, simenti, ndi zowonjezera zosiyanasiyana.

Kuphatikiza pa ntchito zazikuluzikuluzi, HPMC imathanso kupereka maubwino ena kumatope osakaniza. Mwachitsanzo, imatha kupititsa patsogolo kumamatira kwa matope ku gawo lapansi, zomwe ndizofunikira pakugwiritsa ntchito monga kuyika matailosi. Zingathenso kusintha kusinthasintha kwa matope, zomwe zimapangitsa kuti zisawonongeke komanso kusweka ndi kupsinjika maganizo.

Posankha HPMC kuti igwiritsidwe ntchito mumatope a drymix, zifukwa zingapo ziyenera kuganiziridwa. Chofunika kwambiri pazifukwa izi ndi kukhuthala kwa HPMC. Kukhuthala kwa HPMC kudzatsimikizira kuchuluka kwa makulidwe ndi kusunga madzi komwe kumapereka kumatope. Zina zomwe ziyenera kuganiziridwa ndi pH ya HPMC, digiri yake yolowa m'malo (DS), ndi kukula kwake.

PH ya HPMC ndiyofunikira chifukwa imatha kukhudza nthawi yoyika matope. Ngati pH ili yokwera kwambiri kapena yotsika kwambiri, imatha kukhudza momwe mankhwalawo amachitikira panthawi yochiritsa, zomwe zimayambitsa mavuto monga kuchepa kwa mphamvu kapena kuchuluka kwa shrinkage.

DS ya HPMC ndi muyeso wamagulu angati a hydroxypropyl ndi methyl omwe amalumikizidwa pamsana wa cellulose. DS yapamwamba imatanthawuza kuti magulu ambiri a hydroxypropyl ndi methyl alipo, zomwe zimapangitsa kuti HPMC ikhale yosungunuka m'madzi komanso yowoneka bwino. Kutsika kwa DS kumatanthauza kuti magulu ochepera a hydroxypropyl ndi methyl alipo, zomwe zimapangitsa kuti HPMC isasungunuke m'madzi komanso yopanda viscous.

Kukula kwa tinthu ta HPMC kungakhudzenso magwiridwe ake mumatope owuma. Zikuluzikulu tinthu kukula zingachititse m'goli kufalitsa HPMC lonse matope, pamene ang'onoang'ono tinthu kukula kungachititse clumping ndi agglomeration wa HPMC.

Pomaliza, HPMC ndi chowonjezera chofunikira mu matope a drymix. Amapereka maubwino osiyanasiyana, kuphatikiza kuwongolera magwiridwe antchito, kusunga madzi, komanso kubalalitsidwa kwa tinthu ting'onoting'ono.