Ni gute wahitamo hydroxypropyl methylcellulose kuri mortier ya plaster?

Agaciro ka pH muri rusange k'ibikomoka kuri gypsum ni aside cyangwa neutral. Ubu hari ubwoko bubiri bw'urwego rw'ubwubatsihydroxypropyl methylcelluloseku isoko: cellulose ishonga buhoro buhoro na cellulose ihita (S). Cellulose ihita ntikwiriye sisitemu za gypsum. Ibicuruzwa, gushonga ni bibi cyane mu bihe bya aside cyangwa bidafite aho bibogamiye, kandi hydroxypropyl methylcellulose ishonga buhoro buhoro ishobora gushonga mu bicuruzwa bya gypsum, ariko cellulose ishonga buhoro buhoro ifite ikibazo gikomeye, biroroshye guteranya (iyo gypsum Nyuma y’uko mortila ivanzwe ku rukuta igihe gito, utudomo duto dukunda kugaragara hejuru). Kuri ubu, mu bicuruzwa bya gypsum, cyane cyane mu mortila ya gypsum iterwa na mashini, birakenewe ko cellulose ether ishobora gukwirakwira neza no gushonga mu gihe gito cyane, ibi bikaba bidusaba gukora ubushakashatsi bwimbitse ku buryo bwo gukora ether ya cellulose ishonga buhoro buhoro. Gutunganya ubuso (atari ibyo kwitwa kongeramo ibindi bintu muri ether isanzwe ya cellulose), kugira ngo bihuze na sisitemu ya gypsum. Hydroxypropyl methylcellulose ether hamwe no gutunganya ubuso bwimbitse ishobora kugira igihe cyo gushonga gihamye n’imiterere myiza ya mekanike muri mortila ya gypsum, kandi ishobora kunoza cyane uburyo bwo kuringaniza no kurangiza mortila.

Igikoresho cya gypsum giterwa n'imashini muri rusange gikoresha eteri ya hydroxypropyl methylcellulose ifite ubukana buke buri hagati ya 20.000 na 75.000, kandi ingano y'inyongera muri rusange ni 0.2% kugeza 0.4%. Igihe cyo gushyiraho igikoresho cya gypsum giterwa n'imashini kigenzurwa mu gihe kingana n'isaha 1. Dukoresha imbaraga z'umusaruro wa gypsum, ubukana bwa pulasitiki, thixotropy, rheology n'uburyo ibintu bimeze kugira ngo dupime imikorere y'ibicuruzwa bya gypsum.

Turasuzuma uburyo bwo kugenzura ubuziranenge bw'uburyo bwo gukuraho sulfurization ya gypsum source calcining, fillers (simenti, fine aggregate, ifu ya kalisiyumu nyinshi) n'ibivange (bishobora gukoreshwa mu ifu ya latex isakaye, hydroxypropyl methyl cellulose ether, expanded perlite, gypsum retarder) Guhitamo formula rusange y'ibicuruzwa birahendutse.

Hydroxypropyl methyl cellulose etherkuko sima ya gypsum ifite isuku nyinshi kandi ikora neza, kandi yashimwe cyane n'abakiriya ba sima ya gypsum.