Njira yopangira ndi magwiridwe antchito a hydroxyethyl cellulose (HEC)

I. Chiyambi

Hydroxyethyl Cellulose (HEC) ndi polima yosasungunuka m'madzi yomwe imagwiritsidwa ntchito kwambiri pochotsa mafuta, zokutira, kupanga, mankhwala a tsiku ndi tsiku, kupanga mapepala ndi zina. HEC imapezeka mwa kusintha kwa mankhwala a cellulose, ndipo makhalidwe ake ndi ntchito zake zimatsimikiziridwa makamaka ndi zinthu zomwe zimalowa m'malo mwa hydroxyethyl pa mamolekyu a cellulose.

II. Njira yopangira

Njira yopangira HEC imaphatikizapo makamaka magawo otsatirawa: kuyeretsa maselo, kutsuka, kutaya madzi m'thupi, kuumitsa ndi kupera. Zotsatirazi ndi chiyambi chatsatanetsatane cha gawo lililonse:

Kuphatikizika kwa ma cellulose

Cellulose imachiritsidwa koyamba ndi alkali kuti ipange alkali cellulose (Cellulose Alkali). Njirayi nthawi zambiri imachitika mu reactor, pogwiritsa ntchito sodium hydroxide solution kuti ipange cellulose yachilengedwe kuti ipange alkali cellulose. Machitidwe a mankhwala ndi awa:

Selo-OH+NaOH→Cell-O-Na+H2OCell-OH+NaOH→Cell-O-Na+H 2O

Kenako, alkali cellulose imakumana ndi ethylene oxide ndikupanga hydroxyethyl cellulose. Yankho lake limachitika pansi pa kupanikizika kwakukulu, nthawi zambiri 30-100°C, ndipo yankho lake ndi motere:

Cell-O-Na+CH2CH2O→Cell-O-CH2CH2OHCell-O-Na+CH 2CH 2O→Cell-O-CH 2CH 2OH

Izi zimafuna kuwongolera bwino kutentha, kuthamanga kwa mpweya ndi kuchuluka kwa ethylene oxide yomwe yawonjezeredwa kuti zitsimikizire kuti chinthucho chikugwirizana komanso chili bwino.

Kusamba

HEC yosaphikidwa nthawi zambiri imakhala ndi alkali yosasinthika, ethylene oxide ndi zinthu zina zomwe zimachotsedwa, zomwe zimafunika kuchotsedwa ndi kutsukidwa madzi kangapo kapena kutsukidwa ndi zinthu zosungunulira zachilengedwe. Madzi ambiri amafunika panthawi yotsukidwa madzi, ndipo madzi otayira pambuyo potsukidwa amafunika kutsukidwa ndi kutulutsidwa.

Kusowa madzi m'thupi

HEC yonyowa ikatha kutsukidwa iyenera kuchotsedwa madzi, nthawi zambiri pogwiritsa ntchito vacuum filtration kapena centrifugal leating kuti muchepetse chinyezi.

Kuumitsa

HEC youma imaumitsidwa, nthawi zambiri popopera kapena kuuma mwachangu. Kutentha ndi nthawi ziyenera kulamulidwa mosamala panthawi youma kuti kutentha kwambiri kusamawonongeke kapena kusakanikirana.

Kupera

Chophimba cha HEC chouma chiyenera kuphwanyidwa ndikusefedwa kuti chikhale chofanana ndi kukula kwa tinthu, ndipo pamapeto pake chikhale ufa kapena mankhwala opangidwa ndi tinthu tating'onoting'ono.

III. Makhalidwe a ntchito

Kusungunuka kwa madzi

HEC imasungunuka bwino m'madzi ndipo imatha kusungunuka mwachangu m'madzi ozizira komanso otentha kuti ipange yankho lowonekera kapena lowala. Kusungunuka kumeneku kumapangitsa kuti igwiritsidwe ntchito kwambiri ngati chokhuthala komanso chokhazikika muzophimba ndi mankhwala a tsiku ndi tsiku.

Kukhuthala

HEC imakulitsa kwambiri madzi, ndipo kukhuthala kwake kumawonjezeka ndi kuchuluka kwa kulemera kwa mamolekyu. Kukhuthala kumeneku kumathandizira kuti ikhale ndi gawo pakukhuthala, kusunga madzi komanso kukonza magwiridwe antchito omanga m'zophimba zochokera m'madzi ndi m'zitini zomangira.

Rheology

Madzi a HEC ali ndi mphamvu zapadera za rheological, ndipo kukhuthala kwake kumasintha ndi kusintha kwa kuchuluka kwa shear, zomwe zimasonyeza kuchepa kwa shear kapena pseudoplasticity. Mphamvu ya rheological iyi imalola kuti isinthe kusinthasintha ndi magwiridwe antchito a zomangamanga mu zokutira ndi madzi obowola mafuta.

Kusakaniza ndi kuyimitsa

HEC ili ndi mphamvu zabwino zoyeretsera ndi kuyimitsa, zomwe zimatha kukhazikika tinthu tomwe timayimitsidwa kapena madontho mu dongosolo lofalikira kuti tipewe kugawanika ndi kusungunuka kwa nthaka. Chifukwa chake, HEC nthawi zambiri imagwiritsidwa ntchito pazinthu monga zokutira za emulsion ndi zoyimitsidwa za mankhwala.

Kuwonongeka kwa zinthu zachilengedwe

HEC ndi chinthu chachilengedwe chochokera ku cellulose chomwe chimatha kuwonongeka bwino, sichiwononga chilengedwe, ndipo chimakwaniritsa zofunikira zoteteza chilengedwe chobiriwira.

IV. Magawo Ogwiritsira Ntchito

Zophimba

Mu zophimba zochokera m'madzi, HEC imagwiritsidwa ntchito ngati chokhuthala komanso chokhazikika kuti chiwongolere kusinthasintha kwa madzi, magwiridwe antchito a zomangamanga komanso mphamvu zoletsa kugwa kwa zophimbazo.

Ntchito yomanga

Mu zipangizo zomangira, HEC imagwiritsidwa ntchito mu matope opangidwa ndi simenti ndi ufa wa putty kuti iwonjezere magwiridwe antchito a zomangamanga komanso kusunga madzi.

Mankhwala a Tsiku ndi Tsiku

Mu sopo, shampu, ndi mankhwala otsukira mano, HEC imagwiritsidwa ntchito ngati chokhuthala komanso chokhazikika kuti chikhale cholimba komanso chomveka bwino cha mankhwalawa. 

Malo Ophikira Mafuta

Mu kuboola ndi kuswa madzi m'malo otayira mafuta, HEC imagwiritsidwa ntchito kusintha mawonekedwe a rheology ndi kuyimitsidwa kwa madzi oboola ndikuwonjezera magwiridwe antchito ndi chitetezo cha kuboola.

Kupanga mapepala

Pakupanga mapepala, HEC imagwiritsidwa ntchito kuwongolera kusinthasintha kwa zamkati ndikuwonjezera kufanana ndi mawonekedwe a pamwamba pa pepala.

Hydroxyethyl cellulose (HEC) yagwiritsidwa ntchito kwambiri m'mafakitale ambiri chifukwa cha kusungunuka bwino kwa madzi, kukhuthala, mphamvu zake zolumikizirana ndi mafupa, mphamvu zake zosungunulira ndi kuyimitsa, komanso mphamvu zake zowola. Njira yake yopangira ndi yokhwima. Kudzera mu njira zoyeretsera maselo a cellulose, kutsuka, kutaya madzi m'thupi, kuumitsa ndi kupukuta, zinthu za HEC zomwe zimagwira ntchito bwino komanso zabwino zitha kukonzedwa. M'tsogolomu, ndi kusintha kwa zofunikira zoteteza chilengedwe komanso kupita patsogolo kwa ukadaulo, mwayi wogwiritsa ntchito HEC udzakhala wokulirapo.