Kaphatikizidwe ndi Rheological Properties wa Hydroxyethyl Cellulose Ether

Pamaso pa chothandizira chodzipangira chokha cha alkali, mafakitale a hydroxyethyl mapadi anachita ndi N-(2,3-epoxypropyl) trimethylammonium kolorayidi (GTA) cationization reagent kukonzekera mkulu-m'malo quaternary ammonium ndi youma njira mchere mtundu Hydroxyethyl mapadi efa (HEC). Zotsatira za chiŵerengero cha GTA ndi hydroxyethyl cellulose (HEC), chiŵerengero cha NaOH ku HEC, kutentha komweko, ndi nthawi yochitapo kanthu pazochitikazo zinafufuzidwa ndi ndondomeko yoyesera yunifolomu, ndipo ndondomeko yowonjezereka inapezedwa kudzera ku Monte. Carlo kayeseleledwe. Ndipo momwe magwiridwe antchito a cationic etherification reagent amafika 95% mwa kutsimikizira koyeserera. Pa nthawi yomweyi, katundu wake wa rheological adakambidwa. Zotsatira zinasonyeza kuti yankho laHEC adawonetsa mawonekedwe amadzimadzi omwe si a Newtonian, ndipo mawonekedwe ake amawonekedwe amachulukirachulukira ndikuwonjezeka kwa misa ya misa; mu ndende ya mchere njira, zikuoneka mamasukidwe akayendedwe aHEC kuchepa ndi kuwonjezeka kwa mchere wowonjezera. Pansi pa mlingo womwewo wakumeta ubweya, kukhuthala kowoneka kwaHEC mu dongosolo la CaCl2 yankho ndilapamwamba kuposa laHEC mu NaCl solution system.

Mawu ofunikira:Hydroxyethylcellulose ether; njira youma; rheological katundu

Ma cellulose amakhala ndi magwero olemera, kuwonongeka kwachilengedwe, kuyanjana kwachilengedwe komanso kutulutsa kosavuta, ndipo ndi malo opangira kafukufuku m'magawo ambiri. Cationic cellulose ndi imodzi mwazoyimira zofunika kwambiri zotumphukira za cellulose. Mwa ma polima a cationic pazinthu zodzitetezera zolembetsedwa ndi CTFA ya Fragrance Industry Association, kumwa kwake ndikoyamba. Itha kugwiritsidwa ntchito kwambiri pazowonjezera zowongolera tsitsi, zofewa, kubowola shale hydration inhibitors ndi anti-coagulation agents ndi madera ena.

Pakalipano, njira yokonzekera quaternary ammonium cationic hydroxyethyl cellulose ether ndi njira yosungunulira, yomwe imafuna ndalama zambiri zosungunulira organic, ndizokwera mtengo, zosatetezeka, ndipo zimaipitsa chilengedwe. Poyerekeza ndi njira zosungunulira, njira youma ili ndi zabwino zambiri za njira yosavuta, kuchita bwino kwambiri, komanso kuwononga chilengedwe. Mu pepala ili, cationic cellulose ether inapangidwa ndi njira youma ndipo khalidwe lake la rheological linaphunziridwa.

1. Gawo loyesera

1.1 Zipangizo ndi ma reagents

Hydroxyethyl mapadi (HEC mafakitale mankhwala, maselo m'malo digiri DS ndi 1.8 ~ 2.0); cationization reagent N-(2,3-epoxypropyl) trimethylammonium chloride (GTA), yokonzedwa kuchokera ku epoxy chloride Propane ndi trimethylamine amadzipangira okha pazinthu zina; wodzipangira yekha alkali chothandizira; Mowa ndi glacial acetic asidi ali analytical woyera; NaCl, KCl, CaCl2, ndi AlCl3 ndi ma reagents opanda mankhwala.

1.2 Kukonzekera kwa quaternary ammonium cationic cellulose

Onjezani 5g ya cellulose ya hydroxyethyl ndi kuchuluka koyenera kwa zopangira zamchere zamchere mu silinda yachitsulo yacylindrical yokhala ndi choyatsira, ndikuyambitsanso kwa mphindi 20 kutentha kwapakati; Kenako onjezani kuchuluka kwa GTA, pitilizani kuyambitsa kwa mphindi 30 kutentha kwa firiji, ndikuchitapo kanthu pa kutentha ndi nthawi, chinthu cholimba chosalimba chomwe chidapangidwa. The zosakayikitsa ankawaviika Mowa njira munali kuchuluka kwa asidi asidi, osefedwa, otsukidwa, ndi vakuyumu-zouma kupeza ufa quaternary ammonium cationic mapadi.

1.3 Kutsimikiza kwa gawo la nitrogen mass of quaternary ammonium cationic hydroxyethyl cellulose

Gawo lalikulu la nayitrogeni m'zitsanzolo linatsimikiziridwa ndi njira ya Kjeldahl.

2. Kuyesera kupanga ndi kukhathamiritsa kwa njira youma kaphatikizidwe

Njira yopangira yunifolomu idagwiritsidwa ntchito popanga kuyesera, ndipo zotsatira za chiŵerengero cha GTA ku hydroxyethyl cellulose (HEC), chiŵerengero cha NaOH ku HEC, kutentha kwa zomwe zimachitika ndi nthawi yochitapo kanthu zinafufuzidwa.

3. Kafukufuku wa rheological properties

3.1 Mphamvu ya ndende komanso liwiro lozungulira

Kutengera zotsatira za kumeta ubweya wa ubweya pa mawonekedwe akukhuthala aHEC pamitundu yosiyanasiyana Ds = 0.11 mwachitsanzo, zitha kuwoneka kuti kuchuluka kwa kukameta ubweya kumawonjezeka pang'onopang'ono kuchokera ku 0.05 mpaka 0.5 s-1, kukhuthala kowonekera kwaHEC yankho limachepa, makamaka pa 0.05 ~ 0.5s-1 kukhuthala kowonekera kumatsika kwambiri kuchokera ku 160MPa·s ku 40MPa·s, kukameta ubweya wa ubweya, kusonyeza kutiHEC njira amadzimadzi anasonyeza sanali Newtonian rheological katundu. Zotsatira za kumeta ubweya wogwiritsidwa ntchito ndikuchepetsa mphamvu yolumikizana pakati pa tinthu tating'ono ta gawo lobalalika. Pazifukwa zina, mphamvu yaikulu, ndikuwonetsa kukhuthala kwakukulu.

Itha kuwonedwanso kuchokera ku viscosities yowoneka bwino ya 3% ndi 4%HEC njira zamadzimadzi kuti ndende misa motsatana 3% ndi 4% pa mitengo kukameta ubweya osiyana. Kuwoneka kowoneka bwino kwa yankho kumasonyeza kuti mphamvu yake yowonjezera kukhuthala kumawonjezeka ndi ndende. Chifukwa chake ndi chakuti pamene ndende ikuwonjezeka mu njira yothetsera vutoli, kusagwirizana pakati pa mamolekyu a unyolo waukulu waHEC ndipo pakati pa unyolo wa maselo ukuwonjezeka, ndipo kukhuthala koonekera kumawonjezeka.

3.2 Zotsatira za kuchuluka kwa mchere wosiyanasiyana

Kukhazikika kwaHEC inakhazikitsidwa pa 3%, ndipo zotsatira za kuwonjezera mchere NaCl pa viscosity katundu wa yankho adafufuzidwa pamitengo yosiyana ya shear.

Zitha kuwoneka kuchokera ku zotsatira kuti kukhuthala kowoneka kumachepa ndi kuchuluka kwa mchere wowonjezera, kuwonetsa chodziwika bwino cha polyelectrolyte. Izi ndichifukwa chakuti gawo la Na + mumchere wa mchere limamangiriridwa ku anion yaHEC unyolo wam'mbali. Kuchulukirachulukira kwa njira ya mchere, kumapangitsanso kuchuluka kwa neutralization kapena kutchinga kwa polyion ndi kauntala, komanso kuchepa kwa electrostatic repulsion, zomwe zimapangitsa kuchepa kwa kachulukidwe ka polyion. , unyolo wa polima umachepa ndi kupindika, ndipo ndende yowoneka bwino imachepa.

3.3 Zotsatira za mchere wosiyanasiyana wothira

Zitha kuwoneka kuchokera ku mphamvu ya mchere awiri wowonjezera, Nacl ndi CaCl2, pamawonekedwe owoneka bwino aHEC yankho lomwe kukhuthala kowoneka kumachepa ndikuwonjezera mchere wowonjezera, ndipo pamlingo womwewo wakumeta ubweya, mawonekedwe owoneka bwino aHEC yankho mu dongosolo la yankho la CaCl2 Kukhuthala kowonekera ndikwambiri kuposa kwaHEC yankho mu NaCl solution system. Chifukwa chake ndi chakuti mchere wa calcium ndi ion ya divalent, ndipo ndi yosavuta kumanga pa Cl- ya polyelectrolyte side chain. Kuphatikiza kwa gulu la quaternary ammonium paHEC ndi Cl- yafupika, ndi kutchinga ndi zochepa, ndi kachulukidwe mlandu wa unyolo polima ndi apamwamba, chifukwa The electrostatic repulsion pa unyolo polima ndi yaikulu, ndi unyolo polima ndi anatambasula, kotero kukhuthala zikuoneka ndi apamwamba.

4. Mapeto

Kukonzekera kowuma kwa m'malo mwa cationic cellulose ndi njira yabwino yokonzekera ndi ntchito yosavuta, kuchita bwino kwambiri, komanso kuipitsidwa pang'ono, ndipo kungapewe kugwiritsa ntchito mphamvu zambiri, kuipitsidwa kwa chilengedwe, ndi kawopsedwe kobwera chifukwa chogwiritsa ntchito zosungunulira.

The njira ya cationic mapadi ether amapereka makhalidwe a madzimadzi sanali Newtonian ndipo ali ndi makhalidwe kukameta ubweya kupatulira; pamene yankho misa ndende ukuwonjezeka, kumaonekera mamasukidwe akayendedwe ukuwonjezeka; mu mchere wina wothira mchere,HEC kukhuthala kowonekera kumawonjezeka ndi kuwonjezeka ndi kuchepa. Pansi pa mlingo womwewo wakumeta ubweya, kukhuthala kowoneka kwaHEC mu dongosolo la CaCl2 yankho ndilapamwamba kuposa laHEC mu NaCl solution system.