Tan iyo markii ay soo ifbaxday midabyo fal-celiska ah qarnigii la soo dhaafay, sodium alginate (SA) waxay ahayd tiir-dhexaadka dheeha falcelinta ee daabacaadda suufka.
dhejiSi kastaba ha ahaatee, iyada oo horumarinta joogtada ah ee shuruudaha dadka ee saamaynta daabacaadda, sodium alginate sida koollada daabacaadda maaha mid u adkaysata acid iyo alkali xooggan.
Iyo viscosity qaabdhismeedku waa yar yahay, sidaa darteed codsigeeda daabacaadda shaashadda (flat) waxay ku kooban tahay xad;
Qiimaha sodium alginate ayaa sidoo kale kor u kacaya, markaa dadku waxay bilaabeen cilmi-baaris ku saabsan beddelkeeda, ether cellulose waa mid ka mid ah kuwa muhiimka ah.
naxariis leh.Laakiin wakhtigan xaadirka ah alaabta ceeriin ee ugu weyn ee loo isticmaalo diyaarinta ether cellulose waa suuf, wax soo saarkeedu hoos ayuu u dhacayaa, qiimaha ayaa sidoo kale sii kordhaya.
Waxaa intaa dheer, walxaha sida caadiga ah loo isticmaalo etherifying sida chloroacetic acid (aad u sun ah) iyo ethylene oxide (carcinogenic) ayaa sidoo kale waxyeello u leh jidhka bini'aadamka iyo deegaanka.
Iyadoo la eegayo tan, warqadan, ether cellulose ayaa laga soo saaray qashinka dhirta, iyo sodium chloroacetate iyo 2-chloroethanol ayaa loo isticmaalay sida walxaha etherifying si loogu diyaariyo karboksylate.
Saddex nooc oo fiilooyinka ah: methyl cellulose (CMC), hydroxyethyl cellulose (HEC) iyo hydroxyethyl carboxymethyl cellulose (HECMC)
saddexethers celluloseiyo SA ayaa lagu dabaqay daabacaadda dheeha falcelinta ee dharka suufka ah, saameyntooda daabacaadana waa la barbardhigay oo la darsay.
miro.Nuxurka cilmi-baadhiseed ee ugu muhiimsan ee qoraalka waxa loo qaybiyaa saddex qaybood:
(1) Ka soo saar cellulose qashinka dhirta.Iyada oo loo marayo daaweynta shan qashinka dhirta (caws bariiska, qolof bariis, caws qamadi, balka geed
iyo bagasse) ee go'aaminta iyo falanqaynta qaybaha (qoyaanka, dambaska, lignin, cellulose iyo hemicellulose), la doortay.
Saddex walxood oo dhir ah (Badal geed, caws qamadi iyo bagaash) ayaa loo isticmaalaa in laga soo saaro cellulose, iyo cellulose ayaa la soo saaraa.
Habka waa la wanaajiyey;Iyadoo la raacayo shuruudaha habraaca la hagaajiyay, wejiyada cellulose geed, cellulose caws sarreen ah iyo cellulose bagasse ayaa la helay.
Nadiifintu waxay ka sarreysaa 90%, wax-soo-saarkuna wuxuu ka sarreeyaa 40%;waxaa laga arki karaa falanqaynta infrared spectrum iyo ultraviolet nuugista spectrum in wasakhdu.
lignin iyo hemicellulose ayaa asal ahaan laga saaraa, iyo cellulose la helay waxay leedahay nadiif sare;waxaa laga arki karaa falanqaynta kala-duwanaanta raajada in ay la mid tahay alaabta ceeriin ee dhirta.
Marka la barbardhigo, kristalinity qaraabo ah ee alaabta la helay ayaa si weyn u hagaagtay.
(2) Diyaarinta iyo astaamaha ethers cellulose.Isticmaalka cellulose alwaax alwaax ah oo laga soo saaro balka geedka sida walxo ceeriin ah, hal tijaabo ayaa la sameeyay.
Habka pretreatment decrystallization alkali uruursan ee cellulose geed ayaa la wanaajiyey;iyo iyada oo la qaabeynayo tijaabooyinka orthogonal iyo tijaabooyin hal-arji ah,
Habka diyaarinta CMC, HEC iyo HECMC ee alwaax alwaax cellulose ayaa la hagaajiyay siday u kala horreeyaan;
CMC oo leh DS ilaa 1.237, HEC oo leh MS ilaa 1.657, iyo HECMC oo leh DS ee 0.869 ayaa la helay.Marka loo eego falanqaynta FTIR iyo H-NMR, kooxaha ether-ka ee u dhigma ayaa lagu soo bandhigay saddexda alaab ee etherification cellulose;
Foomamka crystal ee ethers-ka CMC, HEC iyo HEECMC dhamaantood waxay isu beddeleen nooca cellulose II, iyo crystallinity si aad ah hoos ugu dhacay.
(3) Codsiga koollada ether cellulose.Saddex nooc oo ethers cellulose ah oo lagu diyaariyey habka ugu habboon ayaa loo isticmaalay dhar suuf ah
Lagu daabacay midabyo fal-celin leh oo la barbar dhigo sodium alginate.Daraasadu waxay ogaatay in SA, CMC, HEC iyo HECMC ay yihiin afar sababood
Koofiyadu waa dhammaan dareerayaasha pseudoplastic, iyo pseudoplasticity ee saddexda ethers cellulose ayaa ka fiican kan SA;Sida ay u kala horreeyaan heerarka samaynta koollada ee afarta koollada
Waa: SA> CMC> HECMC> HEC.Marka la eego saamaynta daabacaadda, CMC midabka muuqda iyo dhexgalka, gacanta daabacaadda
Dareenka, xajinta midabka daabacaadda, iwm waxay la mid yihiin SA, iyo heerka quusta ee CMC ayaa ka fiican SA;
SA way la mid tahay, laakiin HEC midabka muuqda ee soo-saarka, xajinta iyo xoqidda ayaa ka hooseeya SA;Dareenka daabacaadda HECMC, xoqin caabbinta
Xajmiga midabka si loo xoqo waxay la mid tahay SA, iyo heerka saarista koollada ayaa ka sarreeya SA, laakiin soo-saarka midabka muuqda iyo xasilloonida kaydinta HEECMC ayaa ka hooseeya SA.
Erayada muhiimka ah: qashinka dhirta;cellulose;ether cellulose;wax ka beddelka etherification;daabacaadda dheeha falcelinta;
Waqtiga post: Seb-26-2022