Focus on Cellulose ethers

Astaamaha soodhiyam karboksymethyl alaabta cellulose

Carboxymethyl cellulose (Sodium Carboxymethyl Cellulose) loo yaqaan CMC, waa dusha firfircoon kolloid polymer compound, waa nooc ka mid ah ur aan ur lahayn, dhadhan la'aan, derivative cellulose biyo-milmi non-sun, waxaa laga sameeyaa suuf nuugista iyada oo loo marayo daaweynta jirka-kiimikaad. Qalabka cellulose-ka dabiiciga ah ee la helay waa nooc ka mid ah ether cellulose, iyo milixdeeda sodium guud ahaan waa la isticmaalaa, sidaas darteed magaceeda oo buuxa waa in lagu magacaabaa sodium carboxymethyl cellulose, oo ah CMC-Na.

Sida methyl cellulose, carboxymethyl cellulose waxaa loo isticmaali karaa sidii surfactant alaabta refractory iyo sida ku meel gaadh ah ee alaabta refractory.

Sodium carboxymethyl cellulose waa polyelectrolyte synthetic, sidaas darteed waxaa loo isticmaali karaa sida kala-firdhiye iyo xasiliye loogu talagalay slurries refractory iyo castables, iyo sidoo kale waa ku meel gaar ah wax ku oolnimada sare organic binder. Waxay leedahay faa'iidooyinka soo socda:

1. Carboxymethyl cellulose si fiican ayaa loogu dhejin karaa dusha sare ee qaybaha, si fiican u dhexgalaan oo isku xira qaybaha si fiican, si loo helo awood sare oo xoog leh;

2. Tan iyo markii carboxymethyl cellulose waa anionic polymer electrolyte ah, waxa ay yarayn kartaa isdhexgalka ka dhexeeya qayb ka dib markii la adsorbed on dusha qaybaha, iyo ciyaaro doorka kala firdhiso iyo kolloid ilaalinta, sidaas hagaajinaysaa cufnaanta iyo xoogga alaabta iyo yaraynta. gubashada ka dib. Isku-dhafan la'aanta qaab-dhismeedka ururka;

3. Isticmaalka karboxymethyl cellulose sida binder, ma jiro dambas gubashada ka dib, waxaana jira waxyaabo yar yar oo dhalaalay, taas oo aan saameyn ku yeelan heerkulka isticmaalka alaabta.

Tilmaamaha Alaabta

1. CMC waa budo galley ah oo cad ama wax yar oo huruud ah, aan dhadhamin, ur lahayn, aan sun ahayn, si fudud ugu milmi biyaha, waxayna samaysaa kolloid viscous ah oo hufan, xalku waa dhexdhexaad ama waxoogaa alkaline ah. Waxa lagu kaydin karaa wakhti dheer iyada oo aan xumaanin, sidoo kale waxay ku xasilloon tahay heerkulka hooseeya iyo iftiinka qorraxda. Si kastaba ha ahaatee, sababtoo ah isbeddelka heerkulka degdega ah, acidity iyo alkalinity ee xalka ayaa isbeddelaya. Marka la eego saameynta shucaaca ultraviolet iyo microorganisms, waxay sidoo kale keeni doontaa hydrolysis ama oxidation, viscosity ee xalku wuu yaraan doonaa, xitaa xalku waa la kharribi doonaa. Haddii xalku u baahan yahay in la kaydiyo wakhti dheer, waxaa la dooran karaa waxyaallaha ku habboon sida formaldehyde, phenol, benzoic acid, xeryahooda meerkuriga organic, iwm.

2. CMC waxay la mid tahay electrolytes-ka kale ee polymer. Marka ay milanto, marka hore waxay soo saartaa ifafaale barar ah, qaybo ka mid ahna waxay isku dhejiyaan midba midka kale si ay u sameeyaan filim ama viscose, taas oo ka dhigaysa mid aan suurtagal ahayn in la kala firdhiyo, laakiin si tartiib ah u milmaan. Sidaa darteed, marka la diyaarinayo xalkeeda aqueous, haddii qaybaha si isku mid ah loo qoyn karo marka hore, heerka kala diriddu si weyn ayaa loo kordhin karaa.

3. CMC waa hygroscopic. Jawiga, celceliska maadada biyaha ee CMC waxay kordhisaa kororka heerkulka hawada waxayna hoos u dhigtaa kororka heerkulka hawada. Marka celceliska heerkulka qolka uu yahay 80%-50%, dheelitirka biyaha ayaa ka sarreeya 26%, iyo ka koobanaanta biyaha badeecada 10% ama ka yar. Sidaa darteed, baakadaha alaabta iyo kaydinta waa in ay fiiro gaar ah u yeeshaan qoyaanka.

4. Zinc, copper, lead, aluminium, silver, iron, tin, chromium iyo cusbada kale ee culus ee birta ah waxay soo dedejin kartaa xalinta biyaha CMC. Marka laga reebo acetate sunta rasaasta ku salaysan ee cusbada, roobka ayaa wali lagu milmi karaa sodium hydroxide ama ammonium hydroxide. .

5. Asiidhyada organic ama inorganic waxay sidoo kale keeni doonaan roobab xalka alaabtan. Dhacdada roobabku way ku kala duwan tahay nooca iyo fiirsashada aashitada. Guud ahaan, roobabku waxay dhacaan marka pH-gu uu ka hooseeyo 2.5, waxaana la soo celin karaa ka dib marka laga saaro alkali.

6. Cusbada sida kalsiyumka, magnesium iyo milixda miiska, ma laha saameyn roobab ah oo ku saabsan xalka CMC, laakiin waxay saameyneysaa dhimista viscosity.

7. CMC waxay la jaan qaadaysaa xabagyada kale ee biyaha ku milma, jilciyaasha iyo resins.

8. Filimada laga soo qaaday CMC, oo lagu dhex milmay acetone, benzene, butyl acetate, carbon tetrachloride, saliidda castor, saliidda galleyda, ethanol, ether, dichloroethane, petroleum, methanol, methyl acetate, methyl ethyl acetate heerkulka qolka Ketone, toluene, turpentine, xylene, saliidda lawska, iwm. waxba kuma beddeli karaan 24 saacadood gudahood


Waqtiga boostada: Nov-07-2022
WhatsApp Online chat!