Focus on Cellulose ethers

Iwe unogadzira sei methylcellulose?

Chekutanga, iyo cellulose mbishi yehuni pulp / yakanatswa donje inopwanyika, yozoiswa alkali uye pulped pasi pekuita kwecaustic soda. Wedzera olefin oxide (yakadai se ethylene oxide kana propylene oxide) uye methyl chloride ye etherification. Pakupedzisira, kugezwa kwemvura uye kucheneswa kunoitwa kuti pakupedzisira kuwana chenamethylcelluloseupfu. Iyi poda, kunyanya mhinduro yayo ine aqueous, ine zvinhu zvinonakidza zvemuviri. Iyo cellulose ether inoshandiswa muindasitiri yekuvaka imethyl hydroxyethyl cellulose ether kana methyl hydroxypropyl cellulose (inonzi MHEC kana MHPC, kana zita rakarerutswa MC). Ichi chigadzirwa chinoita basa rakakosha mumunda wehupfu hwakaoma dhaka. basa rinokosha.

 

Chii chinonzi kuchengetwa kwemvura kwemethyl cellulose ether (MC)?

Mhinduro: Chiyero chekuchengetedza mvura ndicho chimwe chezviratidzo zvakakosha zvekuyera kunaka kwemethyl cellulose ether, kunyanya mumucheka wakaonda wekugadzira simenti-based uye gypsum-based mortar. Kuwedzerwa kuchengetedza kwemvura kunogona kudzivirira zvinobudirira chiitiko chekurasikirwa kwesimba uye kuputika kunokonzerwa nekunyanya kuomesa uye kusakwana hydration. Kuchengetedzwa kwemvura kwakanakisa kwemethyl cellulose ether pasi pemamiriro ekushisa kwakanyanya ndechimwe chezviratidzo zvakakosha kusiyanisa kushanda kwemethyl cellulose ether. Mumamiriro ezvinhu akajairika, kuchengetwa kwemvura kweanowanzo methyl cellulose ethers kunoderera nekuwedzera kwekushisa. Kana kutonhora kuchikwira kusvika ku40 ° C, kuchengetwa kwemvura kwekazhinji methyl cellulose ethers kunoderedzwa zvikuru, iyo inonyanya kukosha munzvimbo dzinopisa uye dzakaoma. Uye iyo yakaonda-layer kuvakwa padivi rezuva muzhizha ichava nemhedzisiro yakakomba. Nekudaro, kugadzira kushaikwa kwekuchengetwa kwemvura kuburikidza nechiyero chepamusoro kuchaita kuti viscosity yakakwira yezvinhu nekuda kweiyo dosage yakakwira, izvo zvinokonzeresa kusagadzikana pakuvaka.

Kuchengetwa kwemvura kwakakosha zvakanyanya kukwidziridza kuomarara kwemaitiro emamineral gelling system. Pasi pechiito che cellulose ether, mwando wacho unoburitswa zvishoma nezvishoma kusvika pachigadziko chepasi kana mhepo kwenguva yakareba, nekudaro kuve nechokwadi chekuti simenti (samende kana gypsum) ine nguva yakareba yakakwana yekudyidzana nemvura uye zvishoma nezvishoma kuoma.

 

Ndeipi basa remethyl cellulose ether muvhu rakaoma dhaka?

Methyl hydroxyethyl cellulose ether (MHEC) uye methyl hydroxypropyl cellulose ether (HPMC) pamwe chete inonzi methyl cellulose ether.

Mumunda wehupfu hwakaoma dhaka, methyl cellulose ether yakakosha yakagadziridzwa zvinhu zvehupfu hwakaoma sedhaka rekupurasita, plastering gypsum, mataira anonamira, putty, self-leveling material, spray mortar, wallpaper glue uye caulking material. Mumadhaka akasiyana ehupfu hwakaoma, methyl cellulose ether inonyanya kuita basa rekuchengetedza mvura uye kukora.


Nguva yekutumira: Jan-09-2023
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