Kodi carboxymethyl cellulose ndi chiyani?

Kodi carboxymethyl cellulose ndi chiyani?

Yankho:Carboxymethyl celluloseilinso ndi katundu wosiyanasiyana chifukwa cha magawo ake osiyanasiyana olowa m'malo. Mlingo wolowa m'malo, womwe umadziwikanso kuti digiri ya etherification, umatanthauza kuchuluka kwa H m'magulu atatu a OH hydroxyl osinthidwa ndi CH2COONA. Pamene magulu atatu a hydroxyl pa mphete yopangidwa ndi cellulose ali ndi 0.4 H mu gulu la hydroxyl m'malo mwa carboxymethyl, imatha kusungunuka m'madzi. Panthawiyi, imatchedwa 0.4 digirii yolowa m'malo kapena digiri yapakati yoloweza m'malo (digiri yolowa m'malo 0.4-1.2).

Makhalidwe a carboxymethyl cellulose:

(1) Ndi ufa woyera (kapena tirigu wowawa, ulusi), wopanda vuto, wosavulaza, wosungunuka mosavuta m'madzi, ndipo umapanga mawonekedwe omata, ndipo yankho lake sililowerera kapena lamchere pang'ono. Ili ndi kubalalitsidwa kwabwino komanso mphamvu yomangirira.

(2) Njira yake yamadzimadzi imatha kugwiritsidwa ntchito ngati emulsifier yamtundu wamafuta / madzi ndi mtundu wamadzi / mafuta. Ilinso ndi emulsifying mphamvu ya mafuta ndi sera, ndipo ndi emulsifier wamphamvu.

(3) Madziwo akakumana ndi mchere wolemera wachitsulo monga lead acetate, ferric chloride, silver nitrate, stannous chloride, ndi potassium dichromate, mvula imatha kuchitika. Komabe, kupatula lead acetate, imatha kusungunukanso mu sodium hydroxide solution, ndipo ma precipitates monga barium, iron ndi aluminiyamu amasungunuka mosavuta mu 1% ammonium hydroxide solution.

(4) Njirayi ikakumana ndi organic acid ndi inorganic acid solution, mvula imatha kuchitika. Malinga ndi kuwunikaku, pH ikafika 2.5, turbidity ndi mvula zayamba. Chifukwa chake pH 2.5 ikhoza kuonedwa ngati mfundo yofunika kwambiri.

(5) Kwa mchere monga calcium, magnesium ndi mchere wa tebulo, palibe mvula yomwe idzachitika, koma kukhuthala kuyenera kuchepetsedwa, monga kuwonjezera EDTA kapena phosphate ndi zinthu zina kuti zisawonongeke.

(6) Kutentha kumakhudza kwambiri makulidwe ake amadzimadzi. The mamasukidwe akayendedwe amachepetsa lolingana pamene kutentha kukwera, ndi mosemphanitsa. Kukhazikika kwa mamasukidwe akayendedwe amadzimadzi otentha kutentha kumakhalabe kosasinthika, koma mamasukidwe akayendedwe amatha kuchepa pang'onopang'ono akatenthedwa pamwamba pa 80 ° C kwa nthawi yayitali. Kawirikawiri, pamene kutentha sikudutsa 110 ° C, ngakhale kutentha kumasungidwa kwa maola atatu, ndiyeno kuzizira mpaka 25 ° C, kukhuthala kumabwereranso ku chikhalidwe chake choyambirira; koma kutentha kukatenthedwa mpaka 120 ° C kwa maola 2, ngakhale kutentha kumabwezeretsedwa, kukhuthala kumatsika ndi 18.9%. .

(7) Phindu la pH lidzakhalanso ndi chikoka pa makulidwe ake amadzimadzi. Kawirikawiri, pamene pH ya njira yochepetsera-makamaka imapatuka kuchoka ku ndale, kukhuthala kwake kumakhalabe ndi zotsatira zochepa, pamene njira yothetsera kukhuthala kwapakati, ngati pH yake ikuchoka ku ndale, kukhuthala kumayamba kuchepa pang'onopang'ono; ngati pH ya yankho la viscosity yapamwamba imapatuka kuchoka ku ndale, kukhuthala kwake kudzachepa. Kutsika kwakukulu.

(8) Yogwirizana ndi zomatira zina zosungunuka m'madzi, zofewa ndi ma resins. Mwachitsanzo, imagwirizana ndi guluu wa nyama, chingamu arabic, glycerin ndi wowuma wosungunuka. Zimagwirizananso ndi galasi lamadzi, mowa wa polyvinyl, urea-formaldehyde resin, melamine-formaldehyde resin, etc., koma pang'ono.

(9) Filimu yopangidwa ndi kuwala kwa ultraviolet kwa maola 100 idakalibe kusinthika kapena kuphulika.

(10) Pali magawo atatu a viscosity omwe mungasankhe malinga ndi kugwiritsa ntchito. Pakuti gypsum, ntchito sing'anga mamasukidwe akayendedwe (2% amadzimadzi yankho pa 300-600mPa · s), ngati inu kusankha mkulu mamasukidwe akayendedwe (1% njira pa 2000mPa · s kapena kuposa), mukhoza ntchito mu mlingo ayenera anatsitsidwa moyenerera.

(11) Yankho lake lamadzi limagwira ntchito ngati retarder mu gypsum.

(12) Mabakiteriya ndi tizilombo toyambitsa matenda alibe zotsatira zoonekeratu pa mawonekedwe ake a ufa, koma zimakhudza njira yake yamadzimadzi. Pambuyo pa kuipitsidwa, kukhuthala kumatsika ndipo mildew idzawonekera. Kuonjezera kuchuluka koyenera kwa zotetezera pasadakhale kumatha kusunga mamasukidwe ake ndikuteteza mildew kwa nthawi yayitali. Zoteteza kupezeka ndi: ZOKHALA (1.2-benzisothiazolin-3-mmodzi), racebendazim, thiram, chlorothalonil, etc. Buku Kuwonjezera kuchuluka mu amadzimadzi njira ndi 0.05% kuti 0.1%.

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

Yankho: Hydroxypropyl methylcellulose ndi wogwiritsa ntchito kwambiri posungira madzi pazinthu za gypsum cementitious. Ndi kuchuluka kwa zomwe zili mu hydroxypropyl methylcellulose. Kusungidwa kwa madzi kwa zinthu zomangidwa ndi gypsum kumawonjezeka kwambiri. Ngati palibe chosungira madzi chomwe chimawonjezedwa, kuchuluka kwa madzi osungira madzi a gypsum simenti ndi pafupifupi 68%. Pamene kuchuluka kwa madzi osungira madzi ndi 0.15%, mlingo wosungira madzi wa gypsum cemented material ukhoza kufika 90.5%. Ndipo madzi posungira amafuna pansi pulasitala. Mlingo wa wosungira madzi umaposa 0.2%, kuonjezeranso mlingo, ndipo kuchuluka kwa madzi osungiramo zinthu za gypsum cementitious kumawonjezeka pang'onopang'ono. Kukonzekera kwa anhydrite pulasitala zipangizo. Mlingo woyenera wa hydroxypropyl methylcellulose ndi 0.1% -0.15%.

Kodi zotsatira zosiyana za mapadi pa pulasitala wa Paris ndi ziti?

Yankho: Onse a carboxymethyl cellulose ndi methyl cellulose angagwiritsidwe ntchito ngati madzi osunga madzi kwa pulasitala wa Paris, koma madzi kusunga mphamvu ya carboxymethyl mapadi ndi otsika kwambiri kuposa methyl cellulose, ndi carboxymethyl cellulose lili sodium mchere, choncho ndi oyenera Pulasita wa Paris ali ndi retarding zotsatira ndi amachepetsa mphamvu pulasitala.Methyl celluloseNdi njira yabwino yophatikizira zida za gypsum cementitious zomwe zimaphatikizira kusungirako madzi, kukhuthala, kulimbitsa, ndi viscosifying, kupatula kuti mitundu ina imachedwetsa mlingo ukakhala waukulu. apamwamba kuposa carboxymethyl cellulose. Pazifukwa izi, zida zambiri za gypsum composite gelling zitengera njira yophatikizira carboxymethyl cellulose ndi methyl cellulose, zomwe sizimangogwiritsa ntchito mawonekedwe awo (monga kubweza kwa carboxymethyl cellulose, kulimbikitsa mphamvu ya methyl cellulose), ndikuchita zabwino zomwe zimafanana (monga kusungitsa madzi ndi kukhuthala). Mwanjira imeneyi, ntchito yosungira madzi ya gypsum cementitious material komanso ntchito yonse ya gypsum cementitious material ikhoza kukonzedwa, pamene kuwonjezeka kwa mtengo kumasungidwa pamalo otsika kwambiri.