Kugadzira maitiro e-ultra-high viscosity sodium carboxymethyl cellulose

1. General nheyo yeCMC kugadzirwa

(1) Kushandisa quota (solvent nzira, yakaverengerwa patani yechigadzirwa): machira ekotoni, 62.5kg; ethanol, 317.2kg; alkali (44.8%), 11.1kg; monochloroacetic acid, 35.4kg; toluene, 310.2kg,

(2) Production musimboti uye nzira? Alkaline cellulose inogadzirwa kubva ku cellulose uye sodium hydroxide aqueous solution kana sodium hydroxide aqueous ethanol solution, yobva yaita ne monochloroacetic acid kana sodium monochloroacetate kuti iwane chigadzirwa chisina kuchena, uye alkaline chigadzirwa chakaomeswa, Yakaputswa mune inotengeswa carboxymethyl cellulose (sodium munyu muzambiringa. ). Chigadzirwa chisina kuchena chinozobviswa, chagezwa, uye sodium chloride yobviswa, yobva yaomeswa nekupwanywa kuti iwane yakanatswa sodium carboxymethyl cellulose. Iyo kemikari formula ndeyotevera:

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

(3) Tsanangudzo yemaitiro

Iyo cellulose inopwanyika uye yakaturikwa mu ethanol, wedzera lye nemvura makumi matatu pasi pekugara ichibvongodza, ramba uri pa28-32.°C, kutonhora kusvika kune yakaderera tembiricha, wedzera monochloroacetic acid, kupisa kusvika 55°C ye 1.5h uye kuita kwe4h; wedzera acetic acid kuti iite neutralize the reaction musanganiswa , Chigadzirwa chisina kuchena chinowanikwa nekuparadzanisa solvent, uye chigadzirwa chisina kuchena chinoshambidzwa kaviri nemethanol liquid mumidziyo yekuwachira inoumbwa nemusanganisi uye centrifuge, uye yakaomeswa kuwana chigadzirwa.

CMC mhinduro ine yakakwira viscosity, uye tembiricha shanduko haizokonzerese gelation.

2. Nzira yekugadzira ye-ultra-high viscosity sodium carboxymethyl cellulose

  Nzira yekugadzira ye-ultra-high viscosity sodium carboxymethyl cellulose.

nhanho:

(1) Isa cellulose, alkali uye ethanol mu alkalization kneader muchikamu chekuita alkalization pasi pekuchengetedzwa kwenitrogen, uye wozoisa muetherifying agent chloroacetic acid ethanol mhinduro yekutanga etherify zvinhu;

(2) Takura zvinhu zviri pamusoro uchiisa muetherification kneader kudzora tembiricha uye nguva yekuita etherification reaction, uye kutakura zvinhu zvacho kuenda kutangi rekugezesa mushure mekuita etherification kwapera;

(3) Shamba iyo etherification reaction material ne dilute ethanol solution kuti ubvise munyu unogadzirwa nekuita, kuitira kuti kuchena kwechigadzirwa kusvike kupfuura 99.5%;

(4) Zvadaro zvinhu zvinoiswa pasi pekutsikirirwa kwe centrifugal, uye zvinhu zvakasimba zvinotakurwa kune stripper, uye ethanol solvent inobviswa kubva muzvinhu kuburikidza nemucheka;

(5) Izvo zvinhu zvakapfuura nemu stripper zvinopinda mumubhedha unozunguza wakanyungudika kuti uomeswe kubvisa mvura yakawandisa, wobva wapwanya kuti uwane chigadzirwa. Zvakanakira ndezvekuti maitiro acho akakwana, iyo chigadzirwa chemhando indekisi inogona kusvika kune viscosity ye1% B mhando> 10000mpa.s, uye kuchena> 99.5%.

  Carboxymethyl cellulose inobuda ine ether chimiro chinowanikwa nekugadziriswa kwemakemikari echisikigo cellulose. Boka re carboxyl riri pa molecular chain rinogona kugadzira munyu. Munyu unonyanya kuzivikanwa ndeye sodium munyu, kureva sodium carboxymethyl cellulose (Na -CMC), inowanzonzi CMC, ionic ether. CMC ndeyepamusoro fluidity upfu, chena kana chiedza yero pakuonekwa, kuravidza, odorless, non-chepfu, isingabatiki moto, isiri chakuvhe, uye kugadzikana kuti chiedza uye kupisa.