Kodi kukhuthala kwa methyl cellulose ether ndi kofunika bwanji pa matope a gypsum?

Kodi kukhuthala kwa methyl cellulose ether ndi kofunika bwanji pa matope a gypsum?

Yankho: Viscosity ndi gawo lofunikira pakuchita kwa methyl cellulose ether.

Nthawi zambiri, kukhathamira kwamphamvu kumapangitsa kuti matope a gypsum asungidwe bwino. Komabe, kukwezeka kwamphamvu kwamphamvu, kuchuluka kwa molekyulu ya methyl cellulose ether, komanso kutsika kofananirako kusungunuka kwake kudzakhala ndi zotsatira zoyipa pa mphamvu ndi kapangidwe ka matope. The apamwamba mamasukidwe akayendedwe, ndi zoonekeratu kwambiri thickening zotsatira pa matope, koma si mwachindunji molingana. Kukwezeka kwa viscosity, m'pamenenso matope onyowa amawonekera kwambiri. Pakumanga, zimawonetsedwa ngati kumamatira ku scraper ndi kumamatira kwakukulu ku gawo lapansi. Koma sizothandiza kuwonjezera mphamvu zamapangidwe a dothi lonyowa palokha. Kuonjezera apo, panthawi yomanga, ntchito yotsutsa-sag ya matope onyowa sizowoneka bwino. M'malo mwake, ma viscosity ena apakati komanso otsika koma osinthidwa a methyl cellulose ethers ali ndi ntchito yabwino kwambiri pakuwongolera mphamvu zamapangidwe amatope onyowa.

Kodi ubwino wa cellulose ether ndi wofunika bwanji kumatope?

Yankho: Fineness ndiwonso gawo lofunikira la methyl cellulose ether. The MC ntchito youma ufa matope chofunika kukhala ufa ndi otsika madzi okhutira, ndi fineness amafunanso 20% kuti 60% ya tinthu kukula kukhala zosakwana 63m. Ubwino wake umakhudza kusungunuka kwa methyl cellulose ether. Coarse MC nthawi zambiri granular, amene mosavuta kumwazikana ndi kupasuka m'madzi popanda agglomeration, koma mlingo kuvunda ndi wodekha kwambiri, kotero si oyenera ntchito youma ufa matope. Zogulitsa zina zapakhomo ndi flocculent, zosavuta kumwazikana ndi kupasuka m'madzi, ndi zosavuta agglomerate . Mu matope owuma a ufa, MC imamwazikana pakati pa zinthu zopangira simenti monga zophatikiza, zodzaza bwino ndi simenti, ndipo ufa wokwanira wokwanira ungapewe methyl cellulose ether agglomeration mukasakaniza ndi madzi. Pamene MC imawonjezeredwa ndi madzi kuti asungunuke ma agglomerates, zimakhala zovuta kwambiri kumwazikana ndi kupasuka. Coarse MC singowononga chabe, komanso imachepetsa mphamvu yam'deralo ya matope. Pamene matope owuma owuma akugwiritsidwa ntchito m'dera lalikulu, kuthamanga kwa machiritso a matope am'deralo kudzachepetsedwa kwambiri, ndipo ming'alu idzawoneka chifukwa cha nthawi zosiyanasiyana zochiritsa. Kwa matope opopera omwe amapangidwa ndi makina, kufunikira kwa fineness ndipamwamba chifukwa cha nthawi yochepa yosakaniza.

Ubwino wa MC umakhalanso ndi vuto linalake pakusunga madzi. Nthawi zambiri, ma etha a methyl cellulose okhala ndi kukhuthala kofanana koma fineness yosiyana, pansi pa kuchuluka komweko, kuwongolera bwino kumapangitsa kuti madzi asungidwe bwino.

Kodi njira yosankha ma cellulose ndi iti?

Yankho: Kuchuluka kwa cellulose ether komwe kumagwiritsidwa ntchito mosiyanasiyana kumatengera kufunikira kosunga madzi. Oyenera matope amitundu yonse. Magawo omwe amayamwa kwambiri amafunikira kuchuluka kwa cellulose ether. Mitondo yokhala ndi kukula kwa tinthu ting'onoting'ono ndipo motero malo okulirapo amafunikiranso kuchuluka kwa cellulose ether.

Zosintha zosinthidwa zitha kusankhidwa pazofunikira zotsutsana ndi sagging. Ngati kusinthidwa sikukwanira, ma starch ethers, omwe nthawi zambiri amakhala hydroxypropyl starch ethers, akhoza kuwonjezeredwa kuti ateteze ma sags.

The okwana kuchuluka ndi tinthu kukula kwa fillers mu chiphunzitso ayenera kusankhidwa kupereka yosalala ndi wabwino kusasinthasintha.

Kusakaniza gypsum, filler, mtundu ndi kuchuluka kwa cellulose ether ndi momwe mungagwiritsire ntchito ether wowuma ziyenera kuphatikizidwa ndi njira izi:

Pamene matope osakaniza owuma akuwonjezeredwa ku madzi enaake, kuchuluka kwake kumadalira kuchuluka kwa madzi, ndipo madzi onse amawathira popanda kuyambitsa ufa wowuma ndi chiŵerengero cholondola cha madzi ndi phala. Ngati zosakaniza zosiyanasiyana zimasakanizidwa mu gawo lolondola, ndiye kuti titha kupeza matope osalala okhala ndi zida zoyenera zogwiritsira ntchito pambuyo posakaniza.

Kodi zosinthidwa zotani pomanga gypsum ndi wosunga madzi?

Yankho: Zipangizo zamakhoma nthawi zambiri zimakhala zokhala ndi timabowo, ndipo zonse zimayamwa madzi mwamphamvu. Komabe, zomangira za gypsum zomwe zimagwiritsidwa ntchito pomanga khoma zimakonzedwa ndikuwonjezera madzi pakhoma, ndipo madziwo amatengedwa mosavuta ndi khoma, zomwe zimapangitsa kusowa kwa madzi ofunikira kuti hydration ya gypsum ikhale yovuta, zomwe zimapangitsa kuti pakhale zovuta pakumanga ndikuchepetsa. kulimba kwa mgwirizano, zomwe zimapangitsa ming'alu, zovuta zamakhalidwe monga kubowola ndi kusenda. Kupititsa patsogolo kusungirako madzi kwa zida zomangira za gypsum kumatha kupititsa patsogolo zomangamanga komanso mphamvu yomangira khoma. Chifukwa chake, wosungira madzi wakhala chimodzi mwazinthu zofunika kwambiri zopangira gypsum zomangira.

Zomwe zimagwiritsidwa ntchito kwambiri posungira madzi m'dziko langa ndi carboxymethyl cellulose ndi methyl cellulose. Zinthu ziwiri zosungira madzizi ndizochokera ku etha kuchokera ku cellulose. Onse ali ndi ntchito yapamwamba, ndipo pali magulu a hydrophilic ndi hydrophobic m'mamolekyu awo, omwe ali ndi emulsification, colloid yoteteza ndi kukhazikika kwa gawo. Chifukwa mkulu mamasukidwe akayendedwe ake amadzimadzi njira, pamene anawonjezera mu matope kukhalabe ndi madzi okhutira, akhoza bwino kuteteza kwambiri mayamwidwe madzi ndi gawo lapansi (monga njerwa, konkire, etc.) ndi kuchepetsa evaporation mlingo. madzi, potero amathandizira kuti madzi asungidwe. Methyl cellulose ndi osakaniza abwino a gypsum omwe amaphatikiza kusungirako madzi, kukhuthala, kulimbitsa ndi kukhuthala, koma mtengo wake ndi wokwera kwambiri. Kawirikawiri, wothandizira madzi amodzi sangathe kukwaniritsa bwino madzi osungira madzi, ndipo kuphatikiza kwa mitundu yosiyanasiyana yosungira madzi sikungangowonjezera zotsatira zogwiritsira ntchito, komanso kuchepetsa mtengo wa zipangizo za gypsum.

Kodi kusungirako madzi kumakhudza bwanji zinthu za gypsum composite simenti?

Yankho: Kuchuluka kwa madzi osungira madzi kumawonjezeka ndi kuwonjezera kwa methyl cellulose ether mumtundu wa 0.05% mpaka 0.4%. Pamene kuchuluka kwa madzi kumawonjezeka, chizoloŵezi chowonjezereka chosungira madzi chinachepa.