Habka wax soo saarka ee ultra-high viscosity sodium carboxymethyl cellulose

1. Mabda'a guud ee wax soo saarka CMC

(1) Kootada isticmaalka (habka millatariga, oo la xisaabiyo halkii tan oo badeecad ah): suufka suufka ah, 62.5kg; ethanol, 317.2kg; alkali (44.8%), 11.1kg; monochloroacetic acid, 35.4kg; toluene, 310.2 kg,

(2) Mabda'a iyo habka wax-soo-saarka? Alkaline cellulose waxaa laga sameeyaa cellulose iyo sodium hydroxide xal aqueous ama sodium hydroxide aqueous ethanol xal, ka dibna la falgal monochloroacetic acid ama sodium monochloroacetate si aad u hesho badeeco cayriin, iyo alaabta alkaline waa la qalajiyey ). Badeecada cayriin ayaa markaa la dhex-dhexaadiyaa, la dhaqaa, lagana saaraa sodium chloride, ka dibna la qalajiyo oo la jajabiyo si loo helo sodium carboxymethyl cellulose oo la safeeyey. Qaabka kiimikada waa sida soo socota:

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

(3) Sharaxaada habka

Cellulose waa la jajabiyey oo la hakiyey ethanol, ku dar lye leh 30 roob oo walaaqaya joogto ah, ku hay 28-32°C, qabooji heerkul hooseeya, ku dar monochloroacetic acid, kuleyl ilaa 55°C ilaa 1.5 saacadood oo ka jawaab 4saac; ku dar acetic acid si aad u baabi'iso isku-darka falcelinta, Badeecada cayriin waxaa lagu helaa iyadoo la kala saarayo dareeraha, iyo badeecada cayriin waxaa lagu dhaqaa laba jeer dareeraha methanol ee qalabka wax lagu dhaqo oo ka kooban isku-darka iyo centrifuge, oo la qalajiyey si loo helo alaabta.

Xalka CMC waxa uu leeyahay viscosity sare, iyo isbeddelka heerkulka ma keeni doono gelation.

2. Habka wax soo saarka ee ultra-sare viscosity sodium carboxymethyl cellulose

  Habka wax-soo-saarka ee sodium karboxymethyl cellulose viscosity ultra-high.

tallaabo:

(1) Ku rid cellulose, alkali iyo ethanol ee cajiinka alkalization ee saamiga si ay u fuliyaan alkalization hoos ilaalinta nitrogen, ka dibna ku rid wakiilka etherifying chloroacetic acid ethanol xal in marka hore etherify alaabta;

(2) Ku rari walxaha kor ku xusan jilbaha etherification si loo xakameeyo heerkulka iyo waqtiga falcelinta falcelinta etherification, oo u qaado alaabta haanta dhaqida ka dib marka falcelinta etherification la dhammeeyo;

(3) Ku dhaq walxaha falcelinta etherification-ka oo leh xal ethanol oo la walaaqo si aad uga saarto milixda ay dhaliso fal-celinta, si nadiifnimada alaabadu u gaarto in ka badan 99.5%;

(4) Kadibna walxaha waxaa lagu dhejiyaa cadaadis centrifugal ah, walxaha adagna waxaa loo qaadaa xargaha, iyo dareeraha ethanol ayaa laga soo saaraa walxaha iyada oo loo marayo xargaha;

(5) Walxaha la dhex maro xariijimaha waxay gashaa sariirta dareeraha leh ee gariiraysa si ay u engegaan si ay uga saaraan biyaha xad-dhaafka ah, ka dibna waxay jajabiyaan si ay u helaan alaabta. Faa'iidada ayaa ah in geeddi-socodku uu yahay mid qumman, tusmada tayada badeecadu waxay gaari kartaa viscosity of 1% B nooca> 10000mpa.s, iyo daahirnimada> 99.5%.

  Carboxymethyl cellulose waa soosaar leh qaab dhismeed ether ah oo lagu helay wax ka beddel kiimikaad ee cellulose dabiiciga ah. Kooxda carboxyl ee silsiladda molecular waxay samayn kartaa milix. Cusbada ugu caansan waa cusbada sodium, oo ah sodium carboxymethyl cellulose (Na -CMC), sida caadiga ah loo yaqaan CMC, waa eter ionic. CMC waa budo dareere ah oo sarreeya, muuqaal ahaan caddaan ama huruud khafiif ah, aan dhadhamin, ur lahayn, aan sun ahayn, aan guban, caariyaysi lahayn, oo deggan iftiin iyo kulayl.