Focus on Cellulose ethers

Uyini umehluko phakathi kwe-starch ether ne-cellulose ether?

Isitashi i-ether sisetshenziswa kakhulu ekwakhiweni kodaka, okungase kuthinte ukungaguquguquki kodaka olusekelwe ku-gypsum, usimende kanye nomcako, futhi kushintshe ukwakhiwa nokuphikiswa kwe-sag kodaka. Ama-ether esitashi ngokuvamile asetshenziswa ngokuhambisana nama-cellulose ether angashintshiwe futhi ashintshiwe. Ilungele kokubili izinhlelo ezingathathi hlangothi kanye ne-alkaline, futhi ihambisana nezithasiselo eziningi ze-gypsum kanye nemikhiqizo kasimende (njengama-surfactants, i-MC, isitashi ne-polyvinyl acetate namanye ama-polymers ancibilika emanzini).

Izici ze-starch ether ikakhulukazi zingezansi:
(1) Thuthukisa ukumelana ne-sag;
(2) Ukuthuthukisa ukwakheka;
(3) Isivuno esiphezulu sodaka.

Uyini umsebenzi oyinhloko we-starch ether odakeni olomile olususelwa ku-gypsum?
Impendulo: Isitashi i-ether ingenye yezithako eziyinhloko zodaka lwempushana eyomile. Ingahambisana nezinye izithasiselo. Isetshenziswa kabanzi kuma-adhesive tile, ukulungisa ama-mortars, i-gypsum plastering, i-putty yangaphakathi nengaphandle yodonga, i-gypsum-based caulking and filling materials, ama-interface agents, amatshe emasikeni, ifaneleka futhi ifakwe ngesandla noma isifutho nge-cement-based noma i-gypsum. -izinsimbi ezisekelwe. Isebenza kanje:

(1) I-starch ether ivamise ukusetshenziswa kuhlanganiswe ne-methyl cellulose ether, okubonisa umphumela omuhle wokusebenzisana phakathi kwakho kokubili. Ukwengeza inani elifanelekile le-starch ether ku-methyl cellulose ether kungathuthukisa ngokuphawulekayo ukumelana nokushelela kanye nokumelana nokushelela kodaka , ngenani lesivuno esiphezulu.
(2) Ukwengeza inani elifanele le-starch ether odakeni oluqukethe i-methyl cellulose ether kungakhuphula ngokuphawulekayo ukuhambisana kodaka, kuthuthukise ukugeleza kwamanzi, futhi kwenze ukwakhiwa kushelele futhi kushelele.
(3) Ukwengeza inani elifanelekile le-starch ether odakeni oluqukethe i-methyl cellulose ether kungakhuphula ukugcinwa kwamanzi odaka futhi kwandise isikhathi sokuvula.

Yiziphi izinzuzo zokusetshenziswa nezindlela zokugcina isitashi ether?

Impendulo: Ingasetshenziswa njengengxube yemikhiqizo esekwe usimende, imikhiqizo eyenziwe nge-gypsum kanye nemikhiqizo ye-ash-calcium.

(1) Izinzuzo nezicelo:
a. Inomphumela wokujiya odakeni, ingajiya ngokushesha, futhi ibe nokuthambisa okuhle;
b. Isilinganiso sincane, futhi umthamo ophansi kakhulu ungafinyelela umphumela ophezulu;
c. Thuthukisa ikhono lokulwa nesilayidi lodaka oluboshiwe;
d. ukwandisa isikhathi esivulekile sezinto ezibonakalayo;
e. Thuthukisa ukusebenza kokusebenza kwento futhi wenze ukusebenza kube bushelelezi.

(2) Isitoreji:
Umkhiqizo ungenwa kalula ngumswakama futhi kufanele ugcinwe endaweni eyomile nepholile ephaketheni lokuqala. Kungcono ukuyisebenzisa phakathi nezinyanga eziyi-12. (Kunconywa ukuthi kusetshenziswe ngokuhambisana ne-high-viscosity cellulose ether, kanye nesilinganiso esijwayelekile se-cellulose ether ne-starch ether ngu-7:3~8:2)

Iyini indima ye-methyl cellulose ether kudaka olomile lwempuphu?

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

Emkhakheni wodaka lwempuphu eyomile, i-methyl cellulose ether iyinto ebalulekile eshintshiwe yodaka lwempushana eyomile njengodaka lokuplasta, i-gypsum yokuplasta, i-adhesive tile, putty, i-self-leveling material, i-spray mortar, i-adhesive yamaphephadonga kanye nezinto zokukhahlela. Ezisikeni zempushana ezomile ezihlukahlukene, i-methyl cellulose ether idlala indima enkulu yokugcina amanzi kanye nokujiya.

Iyini inqubo yokukhiqizwa kwe-cellulose ether?

Impendulo: Okokuqala, i-cellulose eluhlaza iyachotshozwa, bese i-alkali futhi igxiliwe 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 kutholwe impushana emhlophe. 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 (efushanisiwe njenge-MHEC noma i-MHPC, noma igama elenziwe lula kakhulu i-MC). Lo mkhiqizo udlala indima ebaluleke kakhulu emkhakheni we-powder omile. indima ebalulekile.


Isikhathi sokuthumela: Jan-30-2023
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