Ts'ebetso ea tlhahiso ea ultra-high viscosity sodium carboxymethyl cellulose

1. Molao-motheo o akaretsang oa tlhahiso ea CMC

(1) Tekanyetso ea tšebeliso (mokhoa oa ho qhibiliha, o baloang ka tone ea sehlahisoa): lithara tsa k'hothone, 62.5kg; ethanol, 317.2kg; alkali (44.8%), 11.1kg; monochloroacetic acid, 35.4kg; toluene, 310.2kg,

(2) Molao-motheo oa tlhahiso le mokhoa? Alkaline cellulose e entsoe ka selulose le sodium hydroxide aqueous solution kapa sodium hydroxide aqueous ethanol solution, ebe e arabela ka monochloroacetic acid kapa sodium monochloroacetate ho fumana sehlahisoa se tala, 'me sehlahisoa sa alkaline se omisitsoe, se kenngoa ka har'a carboxymethyl cellulose (sefate sa letsoai sa sodium. ). Sehlahisoa se sa jeleng paate ha se nke lehlakore, se hlatsuoe, ebe se tlosoa sodium chloride, ebe se omisoa le ho siloa ho fumana sodium carboxymethyl cellulose e hloekisitsoeng. Foromo ea lik'hemik'hale e tjena:

(C6H9O4-OH)4+nNaOH-(C6H9O4-ONa)n+nH2O

(3) Tlhaloso ea ts'ebetso

Selulose e pshatlehile 'me e emisoa ka ethanol, eketsa lye ka pula ea 30 tlas'a ho tsosoa kamehla, boloka ho 28-32°C, pholile ho fihlela mocheso o tlase, eketsa monochloroacetic acid, mocheso ho fihlela ho 55°C bakeng sa 1.5h le ho itšoara bakeng sa 4h; eketsa acetic acid ho neutralize motsoako oa karabelo , Sehlahisoa se tala se fumanoa ka ho arola mokelikeli, 'me sehlahisoa se tala se hlatsuoa habeli ka mokelikeli oa methanol ka thepa ea ho hlatsoa e entsoeng ka motsoako le centrifuge,' me e omisitsoe ho fumana sehlahisoa.

Tharollo ea CMC e na le viscosity e phahameng, 'me phetoho ea mocheso e ke ke ea baka gelation.

2. Mokhoa oa tlhahiso ea ultra-high viscosity sodium carboxymethyl cellulose

  Ts'ebetso ea tlhahiso ea ultra-high viscosity sodium carboxymethyl cellulose.

mohato:

(1) Beha selulose, alkali le ethanol ka alkalization kneader ka tekanyo ea ho phetha alkalization tlas'a tšireletso ea naetrojene, 'me joale kenya etherifying moemeli chloroacetic acid ethanol tharollo ho qalong etherify thepa;

(2) Tsamaisa lisebelisoa tse ka holimo ka har'a kneader ea etherification ho laola mocheso le nako ea karabelo bakeng sa karabelo ea etherification, le ho tsamaisa lisebelisoa ho ea tanka ea ho hlatsoa ka mor'a hore karabelo ea etherification e phethoe;

(3) Hlatsoa lisebelisoa tsa etherification ka tharollo ea ethanol e hlapollang ho tlosa letsoai le hlahisoang ke karabelo, e le hore bohloeki ba sehlahisoa bo ka fihla ho feta 99.5%;

(4) Ebe thepa e kenngoa tlas'a khatello ea centrifugal, 'me thepa e tiileng e fetisetsoa ho stripper,' me motsoako oa ethanol o ntšoa ho tloha thepa ka ho hlobolisa;

(5) Thepa e fetisitsoeng ka stripper e kena ka betheng ea mokelikeli o sisinyehang bakeng sa ho omisa ho tlosa metsi a mangata, ebe e senya ho fumana sehlahisoa. Molemo ke hore mokhoa ona o phethahetse, index ea boleng ba sehlahisoa e ka finyella viscosity ea 1% B mofuta> 10000mpa.s, le bohloeki> 99,5%.

  Carboxymethyl cellulose ke ntho e tsoang ho sebopeho sa ether se fumanoang ka phetoho ea lik'hemik'hale ea selulose ea tlhaho. Sehlopha sa carboxyl ka ketane ea molek'hule se ka etsa letsoai. Letsoai le tloaelehileng haholo ke letsoai la sodium, e leng sodium carboxymethyl cellulose (Na -CMC), eo ka tloaelo e bitsoang CMC, ke ionic ether. CMC ke phofshoana e phahameng ea metsi, e tšoeu kapa e mosehla o bobebe ka ponahalo, ha e na tatso, ha e na monko, e se nang chefo, e sa cheseng, e se nang hlobo, 'me e tsitsitse ho khanya le mocheso.