Kodi carboxymethyl cellulose ndi yotani?

Kodi carboxymethyl cellulose ndi yotani?

Yankho:Carboxymethyl celluloseIlinso ndi makhalidwe osiyanasiyana chifukwa cha madigiri ake osiyanasiyana osinthira. Mlingo wa kusintha, womwe umadziwikanso kuti digiri ya etherification, umatanthauza chiwerengero chapakati cha H m'magulu atatu a OH hydroxyl omwe asinthidwa ndi CH2COONa. Pamene magulu atatu a hydroxyl omwe ali pa mphete yochokera ku cellulose ali ndi 0.4 H mu gulu la hydroxyl lomwe lasinthidwa ndi carboxymethyl, limatha kusungunuka m'madzi. Pakadali pano, limatchedwa digiri ya 0.4 yosinthira kapena digiri yapakatikati yosinthira (digiri ya 0.4-1.2).

Katundu wa carboxymethyl cellulose:

(1) Ndi ufa woyera (kapena tinthu tating'onoting'ono, wa ulusi), wopanda kukoma, wopanda vuto, wosungunuka mosavuta m'madzi, ndipo umapanga mawonekedwe owoneka bwino omata, ndipo yankho lake ndi lopanda mbali kapena lopanda mchere pang'ono. Lili ndi mphamvu yofalikira komanso yolumikizana bwino.

(2) Madzi ake angagwiritsidwe ntchito ngati chosakaniza cha mtundu wa mafuta/madzi ndi mtundu wa madzi/mafuta. Chilinso ndi mphamvu yosakaniza mafuta ndi sera, ndipo ndi chosakaniza champhamvu.

(3) Pamene yankholo likumana ndi mchere wachitsulo cholemera monga lead acetate, ferric chloride, silver nitrate, stannous chloride, ndi potassium dichromate, mvula imatha kuchitika. Komabe, kupatula lead acetate, ikhoza kusungunukanso mu sodium hydroxide solution, ndipo precipitates monga barium, iron ndi aluminiyamu zimasungunuka mosavuta mu 1% ammonium hydroxide solution.

(4) Pamene yankholo lakumana ndi organic acid ndi inorganic acid solution, mvula imatha kuchitika. Malinga ndi zomwe zapezeka, pamene pH value ili 2.5, matope ndi mvula zayamba. Chifukwa chake pH 2.5 ikhoza kuonedwa ngati mfundo yofunika kwambiri.

(5) Pa mchere monga calcium, magnesium ndi mchere wa patebulo, palibe mvula yomwe idzagwa, koma kukhuthala kuyenera kuchepetsedwa, monga kuwonjezera EDTA kapena phosphate ndi zinthu zina kuti zisagwere.

(6) Kutentha kumakhudza kwambiri kukhuthala kwa madzi ake. Kukhuthala kumachepa mofanana kutentha kukakwera, ndipo mosemphanitsa. Kukhazikika kwa kukhuthala kwa madzi pa kutentha kwa chipinda sikunasinthe, koma kukhuthala kumatha kuchepa pang'onopang'ono kukatenthedwa pamwamba pa 80°C kwa nthawi yayitali. Nthawi zambiri, kutentha kukapitirira 110°C, ngakhale kutentha kukasungidwa kwa maola atatu, kenako nkuzizira kufika 25°C, kukhuthala kumabwererabe momwe kunalili koyambirira; koma kutentha kukatenthedwa kufika 120°C kwa maola awiri, ngakhale kutentha kukabwezeretsedwa, kukhuthala kumatsika ndi 18.9%.

(7) Mtengo wa pH udzakhalanso ndi mphamvu inayake pa kukhuthala kwa yankho lake lamadzi. Kawirikawiri, pamene pH ya yankho lotsika la kukhuthala isiyana ndi neutral, kukhuthala kwake sikukhudza kwenikweni, pomwe pa yankho lokhala ndi kukhuthala kwapakati, ngati pH yake isiyana ndi neutral, kukhuthala kumayamba kuchepa pang'onopang'ono; ngati pH ya yankho lokwera la kukhuthala isiyana ndi neutral, kukhuthala kwake kudzachepa. Kutsika kwakukulu.

(8) Imagwirizana ndi guluu wina wosungunuka m'madzi, zofewetsa ndi ma resin. Mwachitsanzo, imagwirizana ndi guluu wa nyama, gum arabic, glycerin ndi starch yosungunuka. Imagwirizananso ndi galasi la madzi, polyvinyl alcohol, urea-formaldehyde resin, melamine-formaldehyde resin, ndi zina zotero, koma pang'ono.

(9) Filimu yopangidwa ndi kuwala kwa ultraviolet kwa maola 100 ikadalibe mtundu kapena kusweka.

(10) Pali mitundu itatu ya kukhuthala yomwe mungasankhe malinga ndi momwe mungagwiritsire ntchito. Pa gypsum, gwiritsani ntchito kukhuthala kwapakati (2% yankho lamadzi pa 300-600mPa·s), ngati mwasankha kukhuthala kwakukulu (1% yankho pa 2000mPa·s kapena kuposerapo), mutha kugwiritsa ntchito mu mlingo woyenera kuchepetsedwa.

(11) Madzi ake amadzi amagwira ntchito ngati choletsa mu gypsum.

(12) Mabakiteriya ndi tizilombo toyambitsa matenda sizimakhudza bwino mtundu wa ufa wake, koma zimakhudza madzi ake. Pambuyo pa kuipitsidwa, kukhuthala kumatsika ndipo bowa limaonekera. Kuwonjezera kuchuluka koyenera kwa zotetezera pasadakhale kungathandize kusunga kukhuthala kwake ndikuletsa bowa kwa nthawi yayitali. Zotetezera zomwe zilipo ndi izi: BIT (1.2-benzisothiazolin-3-one), racebendazim, thiram, chlorothalonil, ndi zina zotero. Kuchuluka kwa zowonjezera mu madzi ake ndi 0.05% mpaka 0.1%.

Kodi hydroxypropyl methylcellulose ndi yothandiza bwanji ngati chosungira madzi cha anhydrite binder?

Yankho: Hydroxypropyl methylcellulose ndi chinthu chosungira madzi chomwe chimagwira ntchito bwino kwambiri pazinthu zosungira madzi za gypsum. Pamene kuchuluka kwa hydroxypropyl methylcellulose kukuwonjezeka. Kusunga madzi kwa zinthu zosungira madzi za gypsum kumawonjezeka mofulumira. Ngati palibe chinthu chosungira madzi chomwe chawonjezeredwa, kuchuluka kwa madzi kwa zinthu zosungira madzi za gypsum ndi pafupifupi 68%. Pamene kuchuluka kwa chinthu chosungira madzi kuli 0.15%, kuchuluka kwa madzi kwa zinthu zosungira madzi za gypsum kumatha kufika 90.5%. Ndipo zofunikira pakusunga madzi kwa pulasitala yapansi. Mlingo wa chinthu chosungira madzi umapitirira 0.2%, kuonjezera mlingo, ndipo kuchuluka kwa madzi kwa zinthu zosungira madzi za gypsum kumawonjezeka pang'onopang'ono. Kukonzekera zinthu zopaka utoto za anhydrite. Mlingo woyenera wa hydroxypropyl methylcellulose ndi 0.1%-0.15%.

Kodi zotsatira zosiyana za cellulose zosiyanasiyana pa plaster ya paris ndi ziti?

Yankho: Carboxymethyl cellulose ndi methyl cellulose zingagwiritsidwe ntchito ngati zosungira madzi pa plaster of paris, koma mphamvu yosungira madzi ya carboxymethyl cellulose ndi yotsika kwambiri kuposa ya methyl cellulose, ndipo carboxymethyl cellulose ili ndi mchere wa sodium, kotero ndi yoyenera Plaster of Paris imachedwetsa ntchito ndipo imachepetsa mphamvu ya plaster.Methyl celluloseNdi njira yabwino kwambiri yopangira zinthu zosungira madzi zomwe zimaphatikizapo kusunga madzi, kukhuthala, kulimbitsa, ndi kukhuthala, kupatula kuti mitundu ina imakhala ndi mphamvu yochedwetsa pamene mlingo wake ndi wokwera kuposa carboxymethyl cellulose. Pachifukwa ichi, zinthu zambiri zosakaniza za gypsum zimagwiritsa ntchito njira yopangira carboxymethyl cellulose ndi methyl cellulose, zomwe sizimangogwiritsa ntchito makhalidwe awo (monga mphamvu yochepetsera ya carboxymethyl cellulose, mphamvu yolimbitsa ya methyl cellulose), komanso zimagwiritsa ntchito zabwino zawo zofanana (monga mphamvu yosungira madzi ndi kukhuthala). Mwanjira imeneyi, mphamvu yosungira madzi ya zinthu zosungira madzi za gypsum komanso mphamvu yonse ya zinthu zosungira madzi za gypsum zitha kukonzedwa, pomwe kukwera kwa mtengo kumasungidwa pamalo otsika kwambiri.