Synthesis iyo sifooyinka Rheological ee Hydroxyethyl Cellulose Eter

Iyada oo ay jirto is-kaaliyaha alkali ee is-dhigay, hydroxyethyl warshadaha cellulose waxaa la falgaliyay N- (2,3-epoxypropyl) trimethylammonium chloride (GTA) cationization reagent si loogu diyaariyo beddelka sare ee quaternary ammonium hab qalalan Nooca cusbada Hydroxyethyl cellulose ether (HEC). Saamaynta saamiga GTA iyo hydroxyethyl cellulose (HEC), saamiga NaOH ilaa HEC, heerkulka falcelinta, iyo waqtiga falcelinta ee waxtarka falcelinta ayaa lagu baaray qorshe tijaabo ah oo isku mid ah, iyo xaaladaha habraaca la wanaajiyay ayaa laga helay Monte Monte. jilitaanka Carlo. Iyo waxtarka falcelinta reagent etherification cationic waxay gaartaa 95% iyada oo loo marayo xaqiijinta tijaabada ah. Isla mar ahaantaana, waxaa laga hadlay sifooyinkiisa rheological. Natiijadu waxay muujisay in xalalkaHEC waxay muujisay sifooyinka dareeraha aan Newtonian ahayn, iyo viscosity muuqda ayaa kordhay iyadoo la kordhinayo xoojinta xajmiga xajmiga; in xoogag gaar ah oo xal milix ah, viscosity muuqda eeHEC hoos u dhac ku yimid korodhka xoogga milixda ee lagu daray. Hoosta isla heerka dhogorta, viscosity muuqda eeHEC Nidaamka xalka CaCl2 wuu ka sarreeyaa kanHEC ee nidaamka xalinta NaCl.

Erayada muhiimka ah:Hydroxyethylether cellulose; habka qalalan; sifooyinka rheological

Cellulose waxay leedahay sifooyin ilo qani ah, biodegradability, biocompatibility iyo derivatization fudud, waana goob cilmi baaris ah oo dhinacyo badan ah. Cationic cellulose waa mid ka mid ah wakiilada ugu muhiimsan ee asal ahaan cellulose. Ka mid ah polymers-ka cationic ee alaabada ilaalinta shakhsi ahaaneed ee ka diiwaan gashan CTFA ee Ururka Warshadaha Udugga, isticmaalkeedu waa kan ugu horreeya. Waxaa si weyn loogu isticmaali karaa waxyaabaha lagu daro qaboojiyaha timaha, jilciyaasha, qodista hydration hydration inhibitors iyo wakiilada dhiiga xinjirowga lidka ku ah iyo meelaha kale.

Waqtigan xaadirka ah, habka diyaarinta ee quaternary ammonium cationic hydroxyethyl cellulose ether waa habka dareeraha, kaas oo u baahan qadar badan oo dareere organic qaali ah, waa qaali, aan badbaado lahayn, oo wasakheeya deegaanka. Marka la barbardhigo habka dareeraha, habka qalalan wuxuu leeyahay faa'iidooyinka muuqda ee habka fudud, waxtarka falcelinta sare, iyo wasakhowga deegaanka oo yar. Warqadan, cationic cellulose ether ayaa lagu sameeyay habka qalalan iyo habdhaqankiisa rheological ayaa la darsay.

1. Qaybta tijaabada ah

1.1 Qalabka iyo reagents

Hydroxyethyl cellulose (wax soo saarka warshadaha HEC, shahaadada beddelka molecular ee DS waa 1.8 ~ 2.0); reagent cationization N- (2,3-epoxypropyl) trimethylammonium chloride (GTA), oo laga diyaariyey epoxy chloride Propane iyo trimethylamine ayaa iskood lagu sameeyay xaalado gaar ah; kicin alkali is-dhigay; ethanol iyo glacial acetic acid waa falanqeyn saafi ah; NaCl, KCl, CaCl2, iyo AlCl3 waa reagents kiimiko ahaan saafi ah.

1.2 Diyaarinta quaternary ammonium cationic cellulose

Ku dar 5g oo ah cellulose hydroxyethyl iyo qadar habboon oo ah kicinta alkali ee guriga lagu sameeyo oo ku rid dhululubo bir cylindrical ah oo ku qalabaysan kiciya, ku walaaq 20 daqiiqo heerkulka qolka; ka dibna ku dar qadar go'an oo GTA ah, sii walaaq ilaa 30 daqiiqo heerkulka qolka, oo ka falcelisa heerkul gaar ah iyo waqti, badeeco adag oo cayriin ah oo asal ahaan ku salaysan ayaa la helay. Alaabta cayriin waxaa lagu qooyay xal ethanol ah oo ka kooban qadar ku habboon oo acetic acid ah, la sifeeyay, la dhaqay, iyo faakuum-lagu qallajiyey si loo helo budada quaternary ammonium cationic cellulose.

1.3 Go'aaminta jajabka tirada nitrogen ee quaternary ammonium cationic hydroxyethyl cellulose

Jajabka tirada nitrogen ee shaybaarrada waxaa lagu go'aamiyay habka Kjeldahl.

2. Naqshadaynta tijaabada iyo hagaajinta habka qallalan ee qalalan

Habka naqshadeynta lebbiska ayaa loo isticmaalay in lagu naqshadeeyo tijaabada, iyo saameynta saamiga GTA ee hydroxyethyl cellulose (HEC), saamiga NaOH ilaa HEC, heerkulka falcelinta iyo wakhtiga falcelinta ee waxtarka falcelinta ayaa la baaray.

3. Cilmi-baadhis ku saabsan sifooyinka rheological

3.1 Saamaynta feejignaanta iyo xawaaraha wareega

Qaadashada saamaynta heerka xiirid ee viscosity muuqda eeHEC marka la eego qiyaaso kala duwan Ds=0.11 tusaale ahaan, waxaa la arki karaa marka heerka xiiridu uu si tartiib tartiib ah uga kordho 0.05 ilaa 0.5 s-1, mawjadaha muuqda eeHEC Xalka ayaa hoos u dhacaya, gaar ahaan 0.05 ~ 0.5s-1 viscosity muuqda ayaa si aad ah hoos ugu dhacay 160MPa·s ilaa 40MPa·s, xiirid xiiran, taas oo muujinaysa inHEC xal aqueous soo bandhigay sifooyinka rheological non-Newtonian. Saamaynta cadaadiska xiirid ee codsatay waa in la yareeyo xoogga isdhexgalka ee u dhexeeya qaybaha marxaladda kala firdhiyey. Xaalado gaar ah, marka uu xoog badan yahay, ayaa sii weynaan doona viscosity-ka muuqda.

Waxa kale oo laga arki karaa muuqaalada muuqda ee 3% iyo 4%HEC xalalka aqueous in xooga saarida tirada badan ay u kala horreeyaan 3% iyo 4% ee heerarka xiirid kala duwan. Mawduucyada muuqda ee xalku waxay muujinayaan in awoodiisa korodhka-ku-kordhinta ay korodho feejignaanta. Sababta ayaa ah in marka diiradda la saaro nidaamka xallinta, diidmada wadajirka ah ee u dhexeeya molecules ee silsiladda ugu weynHEC iyo inta u dhaxaysa silsiladaha molecular kor u kaca, iyo viscosity muuqda ayaa kordha.

3.2 Saamaynta xaddiyada kala duwan ee milixda lagu daray

fiirsashada ofHEC waxaa lagu hagaajiyay 3%, iyo saameynta ku darista cusbada NaCl ee sifooyinka viscosity ee xalka ayaa lagu baaray heerar kala duwan oo xiiran.

Waxaa laga arki karaa natiijooyinka in viscosity muuqda uu hoos u dhaco korodhka xoojinta milixda ee lagu daray, taas oo muujinaysa ifafaale cad oo polyelectrolyte ah. Tani waa sababta oo ah qayb ka mid ah Na+ ee xalka milixdu waxay ku xidhan tahay anion of theHEC silsilad dhinac. Xalka milixda ee weyn, ayaa ka sii weyn heerka dhexdhexaadinta ama ilaalinta polyion ee ka hortagga, iyo hoos u dhigista dib-u-celinta elektrostatic, taasoo keentay hoos u dhac ku yimaada cufnaanta cufnaanta ee polyion. , Silsiladda polymer-ka ayaa hoos u dhacda oo laalaa, xoogga muuqdana wuu yaraadaa.

3.3 Saamaynta milixyada kala duwan ee lagu daray

Waxa laga arki karaa saamaynta laba milix oo kala duwan oo lagu daray, Nacl iyo CaCl2, oo ku saabsan viscosity muuqdaHEC Xalka in viscosity-ka muuqda uu hoos u dhaco marka lagu daro milixdii lagu daray, iyo isla heerka xiirid, viscosity muuqda eeHEC xalinta nidaamka xalka CaCl2 Mawduucyada muuqda aad ayuu uga sarreeyaa kanHEC xalinta nidaamka xalinta NaCl. Sababtu waa cusbada kaalshiyamku waa ion kala-duwan, wayna fududahay in lagu xidho Cl- ee silsiladda dhinaca polyelectrolyte. Isku darka kooxda ammonium ee quaternary onHEC oo leh Cl- waa la dhimay, gaashaankuna wuu yaraadaa, cufnaanta cufnaanta silsiladda polymer ayaa ka sarreysa, taasoo keentay in dib-u-celinta elektrostatic ee silsiladda polymer-ka ay ka weyn tahay, silsiladda polymer-ka ayaa la fidiyaa, sidaas awgeed muuqaalka muuqda ayaa sarreeya.

4. Gabagabo

Diyaarinta qallalan ee cellulose cationic ah oo aadka loo beddelo waa hab diyaarin ku habboon oo leh hawl fudud, waxtarka falcelinta sare, iyo wasakhowga yar, waxayna ka fogaan kartaa isticmaalka tamarta sare, wasakhowga deegaanka, iyo sunta ay keento isticmaalka dareeraha.

Xalka cationic cellulose ether wuxuu soo bandhigayaa sifooyinka dheecaanka aan Newtonian ahayn wuxuuna leeyahay sifooyinka khafiifinta xiirta; marka xajinta tirada badan ee xalku korodho, viscosity muuqda ayaa kordha; xad gaar ah oo xal milix ah,HEC viscosity muuqda wuxuu kordhiyaa kororka iyo hoos u dhaca. Hoosta isla heerka dhogorta, viscosity muuqda eeHEC Nidaamka xalka CaCl2 wuu ka sarreeyaa kanHEC ee nidaamka xalinta NaCl.