Hydrophobic hloov hydroxyethyl cellulose (HEC) yog ib pawg derivative los ntawm cov pab pawg hydrophobic, thiab lwm yam) rau cov celluleethyl cellulose (HEC). Cov khoom siv hydrophilic ntawm hydroxyethyl cellulose nrog cov pab pawg hydrophobic thiab siv tshuaj ntxuav, tshuaj pleev ib ce thiab cov tshuaj pleev tshuaj yeeb.
1. Synthesis txoj kev ntawm hydrophobically hloov hydroxyethyl cellulose
Cov synthesis ntawm hydrophobically hloov hydrophyethyl cellulose feem ntau nqa los ntawm cov hauv qab no:
1.1 Cov tshuaj tiv thaiv kev tshaj tawm
Cov qauv no yog kom rov los ua hydroxyethyl cellulose nrog hydrophobic tshuaj lom neeg, thiab lwm yam) los qhia cov tshuaj tiv thaiv hydrophobic mus rau hauv cellulose cov tshuaj tiv thaiv. Esterification cov tshuaj tiv thaiv tsis tuaj yeem tsuas yog qhia cov pab pawg hydrophobic, tab sis kuj tseem hloov kho hydrophobicity thiab thickening cov nyhuv ntawm cov polymers. Qhov kev tawm tsam ntawm cov txheej txheem hluavtaws, xws li kub, lub sijhawm, cov tshuaj ntsuam thiab catalyst, yuav cuam tshuam rau kev ua tau zoo ntawm cov khoom kawg.
1.2 hloov cov kev tawm tsam
Hauv hom no, cov pab pawg hydroxyethyl ntawm hydulose yog hloov los ntawm hydropsobic pab pawg (xws li alkyls (xws li alkyl, thiab lwm yam). Qhov zoo dua ntawm hom qauv no yog cov kev mob sib xws me me, cov qauv kev hloov kho ntawm hydrothethyl cellulose tuaj yeem muaj solubility zoo thiab thickening cov nyhuv.
1.3 cov tshuaj tiv thaivpolymerizer
Los ntawm copolymerizing nrog lwm cov monomers (xws li acrylic acid, acrylate, thiab lwm yam), ib lub polymer tshiab nrog hydrothobicity tuaj yeem npaj tau. Txoj kev no tuaj yeem ua tiav kev tswj hwm ntawm cov tuab ua kev ua tau zoo ntawm cellulose los ntawm kev kho cov sib txawv ntawm cov monomers sib txawv.
1.4 Intercalation Region
Hydrophobic tebchaw yog cov tshuaj kho hauv hydroxyethyl cellulose los tsim hydrophobic blocks lossis ntu. Hom no tuaj yeem txhim kho lub thermal stability thiab cov duab nteg ntom nti ntawm hydrophobically hloov hydrophyethyl cellulose, uas yog qhov tsim nyog rau kev xav tau kev ua haujlwm siab.
2. Thickingchism ntawm hydrophobically hloov hydroxyethyl cellulose
Qhov tuab tuab ntawm hydrophobically hloov hydrophyethyl cellulose feem ntau muaj cov hauv qab no:
2.1 Nce cov kev sib txuam sib xyaw
Cov kev qhia txog cov pab pawg hydrophobic txhim kho cov kev sib cuam tshuam ntawm cov pab pawg ntawm cov kws kho mob, tshwj xeeb tshaj yog nyob rau hauv cov aquousous ib puag ncig ua ke los ua cov molecular loj molecular huaj vam. Qhov kev sib sau ua ke no ua rau muaj kev nce qib ntawm kev daws teeb meem, yog li ua kom pom cov khoom siv tuab tuab.
2.2 Hydrophilic-hydrophobic sib cuam tshuam
Cov pab pawg hydrophilic (xws li hydroxyethyl) thiab hydrophobic pawg (xws li alkyl, thiab lwm yam) hauv hydrophilic-hydrophilic-hydrophobic sib txuam. Nyob rau hauv lub aqueous theem, lub hydrophilic feem cuam tshuam nrog dej lwg me me, thaum muaj cov txiaj ntsig hydrophobic, txuas ntxiv nce cov qauv ntom ntom ntawm cov lwg me me thiab yog li nce viscosity.
2.3 Kev tsim cov qauv network ntawm kev daws teeb meem
Tom qab kev hloov kho hydrophobic, cov qauv ntawm cov molecular yuav hloov pauv, tsim cov qauv sib luag ntawm cov qauv sib txuas. Cov qauv network no tuaj yeem txhim kho cov vencoelasticity thiab thickening muaj peev xwm ntawm kev daws los ntawm kev sib txuas ntawm lub cev sib txuas ntawm cov lwg me me.
2.4 Yooj yim rau tsim cov gel-zoo li qauv
Vim tias kev qhia txog cov pab pawg hydrophobic, hydrophobically hloov hydroxyethyl cellulose muaj cov khoom zoo gelation. Raws li cov xwm txheej tsim nyog, xws li kev hloov pauv ntawm qhov kub thiab txias, hydrophobic hloov kho ntawm cov qauv gel hauv kev daws teeb meem, uas tseem yog qhov ua kom pom ntawm nws cov khoom siv thickening.
3. Kev thov ntawm hydrophobically hloov hydroxyethyl cellulose
Hydrophobic hloov hydrothethyl cellulose yog dav siv nyob rau hauv ntau cov chaw lag luam, txhim kho kev ua tuab thiab txhim kho kev ruaj khov:
3.1 Txheej thiab xim av
Nyob rau hauv cov txheej txheej kev lag luam, hydrophobically hloov hydroxyethyl cellulose tuaj yeem txhim kho cov txheej txheem, ncua kev txhim kho cov dej tsis kam thiab stain restance ntawm txheej.
3.2 Tshuaj ntxuav thiab tshuaj ntxuav
Ntxiv hydrophically hloov hydrophyethyl cellulose rau cov xab npum tuaj yeem txhim kho lub piscosity ntawm kev xab npum, ua rau nws ruaj khov me me thiab yooj yim tswj tau thaum siv.
3.3 Tshuaj pleev ib ce
Nyob rau hauv lub tshuaj pleev ib ce pleev, hydrophobically hloov hydroxyethyl cellulose feem ntau yog siv los ua cov tshuaj pleev thiab lwm yam khoom, uas tuaj yeem txhim kho kev ntxhib los mos thiab xav tias yog cov khoom lag luam.
3.4 Cov Neeg Muaj Tshuaj
Vim tias nws cov thickening zoo thiab biocometically hloov hydroxyethyl cellulose tau tseem tau kawm hauv cov tshuaj tso tawm, uas tuaj yeem tswj hwm cov tshuaj tso tawm.
Los ntawm kev qhia txog hydropsobic pawg, hydrophobically hloov hydroxyethyl cellulose ib qho kev ua kom muaj zog cellulose, tab sis kuj ua rau nws pom tau ua tau zoo heev hauv ntau yam kev siv. Nws cov txheej txheem thickening feem ntau yog nyob ntawm kev sib cuam tshuam ntawm pawg hydrophobic thiab hydrophilic pawg, molecular argitionation cov kev cuam tshuam thiab hloov cov qauv kev daws teeb meem. Nrog qhov sib xyaw ntawm cov kev tshawb fawb, cov txheej txheem sib txuas thiab cov ntawv thov teb ntawm hydrophobically hloov kho hydulose yuav txuas ntxiv mus, nrog kev lag luam hauv kev lag luam dav ntxiv.
Lub sijhawm Post: Feb-15-2025