Focus on Cellulose ethers

Uyenza kanjani i-methylcellulose?

Okokuqala, i-cellulose eluhlaza okotini wokhuni/ukotini ocolisisiwe uyachotshozwa, bese u-alkali futhi ugoqe ngaphansi kwesenzo se-caustic soda. Engeza i-olefin oxide (efana ne-ethylene oxide noma i-propylene oxide) ne-methyl chloride ukuze uthole i-etherification. Ekugcineni, ukugeza nokuhlanzwa kwamanzi kwenziwa ukuze ekugcineni kutholakale okumhlophei-methylcelluloseimpushana. Le powder, ikakhulukazi isixazululo sayo esinamanzi, inezinto ezibonakalayo ezithakazelisayo. I-cellulose ether esetshenziswa embonini yezokwakha i-methyl hydroxyethyl cellulose ether noma i-methyl hydroxypropyl cellulose (okubhekiselwa kuyo njenge-MHEC noma i-MHPC, noma igama elenziwe lula kakhulu i-MC). Lo mkhiqizo udlala indima ebaluleke kakhulu emkhakheni we-powder omile. indima ebalulekile.

 

Kuyini ukugcinwa kwamanzi kwe-methyl cellulose ether (MC)?

Impendulo: Izinga lokugcinwa kwamanzi lingenye yezinkomba ezibalulekile zokulinganisa ikhwalithi ye-methyl cellulose ether, ikakhulukazi ekwakhiweni kongqimba oluncane lodaka olusekelwe kusimende kanye ne-gypsum. Ukugcinwa kwamanzi okuthuthukisiwe kungavimbela ngempumelelo into yokulahlekelwa amandla kanye nokuqhekeka okubangelwa ukomisa ngokweqile kanye nokungena kwamanzi okwanele. Ukugcinwa kwamanzi okuhle kakhulu kwe-methyl cellulose ether ngaphansi kwezimo zokushisa okuphezulu kungenye yezinkomba ezibalulekile zokuhlukanisa ukusebenza kwe-methyl cellulose ether. Ngaphansi kwezimo ezijwayelekile, ukugcinwa kwamanzi kwama-ethers e-methyl cellulose ajwayelekile kuncipha ngokunyuka kwezinga lokushisa. Lapho izinga lokushisa likhuphukela ku-40 ° C, ukugcinwa kwamanzi kwe-methyl cellulose ethers evamile kuncipha kakhulu, okubaluleke kakhulu ezindaweni ezishisayo nezomile. Futhi ukwakhiwa kongqimba oluncane ohlangothini olushisayo ehlobo kuzoba nomthelela omkhulu. Kodwa-ke, ukwenza ukuntuleka kokugcinwa kwamanzi ngokusebenzisa umthamo omkhulu kuzodala i-viscosity ephezulu yezinto ngenxa yomthamo omkhulu, okuzodala ukuphazamiseka ekwakhiweni.

Ukugcinwa kwamanzi kubaluleke kakhulu ukuze kuthuthukiswe inqubo yokuqina kwezinhlelo ze-mineral gelling. Ngaphansi kwesenzo se-cellulose ether, umswakama udedelwa kancane kancane kungqimba lwesisekelo noma emoyeni isikhathi eside, ngaleyo ndlela kuqinisekiswe ukuthi izinto zikasimende (usimende noma i-gypsum) zinesikhathi eside esanele sokusebenzisana namanzi futhi kancane kancane ziba nzima.

 

Iyini indima ye-methyl cellulose ether kudaka olomile lwempuphu?

I-Methyl hydroxyethyl cellulose ether (MHEC) ne-methyl hydroxypropyl cellulose ether (HPMC) ngokuhlangene kubizwa ngokuthi i-methyl cellulose ether.

Emkhakheni wodaka lwempuphu eyomile, i-methyl cellulose ether iyinto ebalulekile eguquliwe odakeni lwempushana eyomile njengodaka lokuplasta, igypsum yokuplasta, ingcina ithayela, i-putty, izinto ezizilinganisa, udaka lwesifutho, i-wallpaper glue kanye ne-caulking material. Ezisikeni zempushana ezomile ezihlukahlukene, i-methyl cellulose ether idlala indima enkulu yokugcina amanzi kanye nokujiya.


Isikhathi sokuthumela: Jan-09-2023
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