Kupanga kwa Ultra-high viscosity sodium carboxymethyl cellulose

1. Mfundo yayikulu yopangira CMC

(1) Kugwiritsa ntchito (njira yosungunulira, yowerengedwa pa tani ya mankhwala): ma linters a thonje, 62.5kg; ethanol, 317.2kg; zamchere (44.8%), 11.1kg; asidi monochloroacetic, 35.4kg; toluene, 310.2kg,

(2) Kupanga mfundo ndi njira? Ma cellulose amchere amapangidwa kuchokera ku mapadi ndi sodium hydroxide amadzimadzi njira kapena sodium hydroxide amadzimadzi Mowa njira, ndiyeno anachita ndi monochloroacetic asidi kapena sodium monochloroacetate kupeza yakuda mankhwala, ndi zamchere mankhwala zouma, Pulverized mu malonda carboxymethyl cellulose (sodium mchere mpesa. ). Zakumwazo zimachotsedwa, kutsukidwa, ndikuchotsedwa ndi sodium chloride, kenako zowumitsidwa ndikuphwanyidwa kuti mupeze woyengedwa wa sodium carboxymethyl cellulose. Chemical formula ndi motere:

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

(3) Kufotokozera ndondomeko

Ma cellulose amaphwanyidwa ndikuyimitsidwa mu ethanol, onjezani lye ndi 30mvula pansi pa kugwedezeka kosalekeza, khalani pa 28-32°C, kuziziritsa kutentha pang'ono, kuwonjezera monochloroacetic acid, kutentha mpaka 55°C kwa 1.5h ndikuchitapo kanthu kwa 4h; onjezerani asidi acetic kuti neutralize osakaniza anachita , The zosakayikitsa akamagwira kulekanitsa zosungunulira, ndipo mankhwala osakhwima otsukidwa kawiri ndi methanol madzi mu kutsuka zipangizo wapangidwa ndi chosakanizira ndi centrifuge, ndi zouma kupeza mankhwala.

Yankho la CMC lili ndi kukhuthala kwakukulu, ndipo kusintha kwa kutentha sikungayambitse gelation.

2. Njira yopangira ultra-high viscosity sodium carboxymethyl cellulose

  Njira yopangira ultra-high viscosity sodium carboxymethyl cellulose.

sitepe:

(1) Ikani mapadi, alkali ndi Mowa mu alkalization kneader mogwirizana kuchita alkalization pansi pa chitetezo asafe, ndiyeno mu etherifying wothandizira chloroacetic asidi Mowa njira poyamba etherify zipangizo;

(2) Kunyamula zipangizo pamwamba mu kneader etherification kulamulira kutentha ndi nthawi anachita kwa etherification anachita, ndi kunyamula zipangizo ku thanki kutsuka pambuyo anachita etherification anamaliza;

(3) Sambani etherification anachita zakuthupi ndi kuchepetsa Mowa njira kuchotsa mchere kwaiye anachita, kuti chiyero cha mankhwala kufika oposa 99,5%;

(4) Kenako zinthuzo zimayikidwa pa kukanikiza kwa centrifugal, ndipo zinthu zolimba zimatumizidwa ku chovulacho, ndipo chosungunulira cha ethanol chimachokera kuzinthuzo kudzera mu chovula;

(5) Zinthu zomwe zimadutsa pa chovulacho zimalowa mu bedi logwedezeka kuti liwumitse kuchotsa madzi ochulukirapo, ndikuphwanya kuti mupeze mankhwala. Ubwino ndi kuti ndondomeko ndi wangwiro, mankhwala khalidwe index akhoza kufika mamasukidwe akayendedwe a 1% B mtundu> 10000mpa.s, ndi chiyero> 99,5%.

  Carboxymethyl cellulose ndi chochokera ku ether kapangidwe kake kamene kamasinthidwa ndi cellulose yachilengedwe. Gulu la carboxyl pa unyolo wa maselo likhoza kupanga mchere. Mchere wodziwika kwambiri ndi mchere wa sodium, womwe ndi sodium carboxymethyl cellulose (Na -CMC), womwe umatchedwa CMC, ndi ionic ether. CMC ndi mkulu fluidity ufa, woyera kapena kuwala chikasu mu maonekedwe, zoipa, odorless, sanali poizoni, sanali kuyaka, sanali mildew, ndi khola kuwala ndi kutentha.