Nigute ushobora guhitamo hydroxypropyl methylcellulose kuri plaster?

Ubusanzwe pH agaciro k'ibicuruzwa bya gypsumu ni acide cyangwa itabogamye. Ubu hari ubwoko bubiri bwurwego rwubwubatsihydroxypropyl methylcelluloseku isoko: selile-buhoro buhoro ya selile na selile ako kanya (S). Cellulose ako kanya ntabwo ibereye sisitemu ya gypsumu. Ibicuruzwa, solubilité irakennye cyane mugihe cya acide cyangwa idafite aho ibogamiye, kandi hydroxypropyl methylcellulose ishonga buhoro irashobora gushonga mubicuruzwa bya gypsumu, ariko selulose ishonga gahoro gahoro ifite ingaruka zikomeye, biroroshye guhuriza hamwe (mugihe gypsumu Nyuma ya minisiteri imaze gukururwa kurukuta mugihe gito, uduce duto duto twa granulaire). Kugeza ubu, mu bicuruzwa bya gypsumu, cyane cyane mu mashini ya gypsum yatewe imashini, birasabwa ko ether ya selile ishobora gutatanwa burundu kandi igashonga mu gihe gito cyane, ibyo bikaba bidusaba gukora ubushakashatsi bwimbitse ku musemburo wa selulose wihuta. Kuvura hejuru (ntabwo aribyo byongeweho ibindi byongeweho murwego rusanzwe rwa selile ether), kugirango uhuze na sisitemu ya gypsum. Hydroxypropyl methylcellulose ether hamwe nubuvuzi bwimbitse burashobora kugira igihe cyo gushonga gihamye hamwe nuburyo bwiza bwubukanishi muri minisiteri ya gypsum, kandi birashobora kunoza cyane uburyo bwo kuringaniza no kurangiza minisiteri.

Imashini yatewe imashini ya gypsum isanzwe ikoresha hydroxypropyl methylcellulose ether iri hagati ya 20.000 na 75.000, kandi umubare wongeyeho ni 0.2% kugeza 0.4%. Igihe cyo gushiraho imashini yatewe na gypsum mortar igenzurwa mugihe cyisaha 1. Dukoresha gypsum mortar itanga umusaruro, ubukonje bwa plastike, thixotropy, rheologiya hamwe no guhuzagurika kugirango tumenye imikorere yibicuruzwa bya gypsumu.

Twihweje kugenzura ubuziranenge bwa desulfurizasi ya gypsum yo kubara isoko, ibyuzuza (sima, igiteranyo cyiza, ifu ya calcium iremereye) hamwe nibindi bivanze (birashobora gukoreshwa mugutatanya ifu ya latex, hydroxypropyl methyl selulose ether, kwagura perlite, gypsum retarder) Guhitamo formulaire yibicuruzwa muri rusange.

Hydroxypropyl methyl selulose etherkuberako gypsum mortar ifite isuku nini kandi ikora neza, kandi yashimiwe cyane nabakiriya ba gypsum.