Cellulose ethers yog cov chav kawm tseem ceeb ntawm cov khoom siv polymer uas tau siv dav hauv kev tsim kho, txheej txheej, tshuaj thiab lwm yam haujlwm. Nws cov qauv tshuaj tshwj xeeb thiab cov khoom siv lub cev ua rau nws muaj txiaj ntsig zoo hauv kev txhim kho adhesion thiab zaj duab xis-tsim cov khoom.
1. Cov khoom tseem ceeb ntawm cellulose ethers
Cellulose ether yog ib hom dej-soluble polymer uas tau los ntawm kev hloov kho tshuaj ntawm ntuj cellulose. Nws cov qauv yooj yim yog cov saw hlau macromolecular uas muaj β-D-glucose units txuas nrog β-1,4-glycosidic bonds. Feem ntau cov cellulose ethers muaj xws li hydroxypropyl methylcellulose (HPMC), methylcellulose (MC), carboxymethylcellulose (CMC), thiab lwm yam Cellulose ethers muaj thickening zoo, dej tuav, stabilization, film-forming thiab lwm yam khoom, uas ua rau lawv ua lub luag haujlwm tseem ceeb hauv ntau yam kev siv. .
2. Mechanism los txhim kho adhesion
Ua kom muaj kev sib txuas ntawm lub ntsej muag: Cellulose ether tuaj yeem tsim cov tshuaj colloidal ruaj khov hauv kev daws. Qhov kev daws teeb meem colloidal no tuaj yeem sib npaug sib npaug ntawm qhov chaw ntawm lub substrate, sau cov micropores saum npoo, thiab txhim kho kev sib txuas ntawm lub ntsej muag. Piv txwv li, ntxiv HPMC rau cov khoom siv hauv tsev tuaj yeem txhim kho qhov adhesion ntawm mortar thiab cov khoom siv hauv paus, ua rau cov mortar ua kom ruaj khov rau ntawm phab ntsa.
Txhim kho lub wettability ntawm substrate nto: Cellulose ether muaj hydrophilicity zoo thiab tuaj yeem txhim kho cov nyhuv ntub dej ntawm cov tshuaj ntawm cov substrate nto, yog li txhim kho adhesion. Wettability yog ib qho tseem ceeb ntawm kev cuam tshuam adhesion. Los ntawm kev txhim kho wettability, cellulose ethers tuaj yeem txhawb cov khoom txheej kom zoo dua ntub thiab npog lub substrate nto.
Txhim kho mechanical embedding: Cov zaj duab xis tsim los ntawm cellulose ether thaum lub sij hawm ziab txheej txheem muaj qee qhov kev hloov pauv thiab lub zog, uas tso cai rau cellulose ether los ua cov tshuab embedding rau saum npoo ntawm substrate los txhim kho adhesion. Qhov no mechanical interlocking nyhuv yog tshwj xeeb tshaj yog tseem ceeb nyob rau hauv coatings thiab adhesives, uas yuav ua tau zoo txhim kho adhesion zog ntawm cov ntaub ntawv.
3. Mechanism los txhim kho zaj duab xis-forming zog
Cov cuab yeej ua yeeb yaj kiab zoo heev: Cellulose ether tuaj yeem tsim cov kua dej muaj kuab zoo tom qab yaj hauv dej, thiab tuaj yeem tsim cov yeeb yaj kiab tsis tu ncua tom qab ziab. Cov yeeb yaj kiab no muaj lub zog zoo txhua yam thiab hloov tau yooj yim, tuaj yeem npog tau zoo ntawm cov substrate thiab txhim kho zaj duab xis-tsim cov khoom. Hauv cov txheej txheem tshuaj thiab cov txheej txheem tshuaj, cov yeeb yaj kiab tsim cov khoom ntawm cellulose ethers yog qhov tseem ceeb tshwj xeeb.
Kev tuav dej zoo: Cellulose ether muaj cov dej tuav tseem ceeb, uas tuaj yeem tswj cov dej noo tsim nyog thaum lub sijhawm tsim cov yeeb yaj kiab thiab tiv thaiv kev tsim cov yeeb yaj kiab los ntawm kev ziab ntau dhau. Kev tuav dej pab tsim cov txheej txheem txheej txheej txheej txheej txheej txheej, tiv thaiv kev tawg thiab tev ntawm zaj duab xis. Hauv kev tsim mortars thiab coatings, cov dej tuav cov khoom ntawm cellulose ethers tuaj yeem txhim kho kev tsim kho ntawm cov ntaub ntawv thiab cov yeeb yaj kiab kawg ua kom zoo.
Tswj kom qhuav ceev: Cellulose ether tuaj yeem kho tus nqi evaporation ntawm cov dej thaum lub sij hawm tsim cov yeeb yaj kiab, ua rau cov txheej txheem tsim cov yeeb yaj kiab tuaj yeem tswj tau. Los ntawm kev tswj kom qhuav ceev, cellulose ether tuaj yeem tiv thaiv kev ntxhov siab vim los ntawm kev ziab sai ntawm cov zaj duab xis txheej, yog li txhim kho qhov zoo thiab ruaj khov ntawm zaj duab xis. Hauv kev lag luam kws tshuaj, cellulose ethers feem ntau yog siv rau cov tshuaj txheej, uas tuaj yeem tswj tau qhov ziab nrawm ntawm txheej txheej thiab xyuas kom muaj kev sib haum xeeb thiab kev ncaj ncees ntawm txheej txheej.
4. Daim ntawv thov piv txwv
Kev tsim kho mortar: Ntxiv HPMC rau kev tsim mortar tuaj yeem txhim kho qhov adhesion thiab kev tsim kho ntawm mortar. Los ntawm nws cov thickening thiab dej-retaining teebmeem, HPMC txhim kho qhov sib cuam tshuam ntawm cov tshuaj khib thiab cov khoom siv hauv paus, thiab txhim kho cov yeeb yaj kiab tsim cov khoom ntawm cov tshuaj khib nyiab, ua rau cov mortar smoother thaum lub sij hawm tsim kho thiab muaj zog tom qab tsim zaj duab xis.
Xim: Ntxiv cellulose ether rau cov xim pleev xim dej tuaj yeem txhim kho cov qib thiab cov yeeb yaj kiab tsim cov khoom ntawm cov xim, ua rau cov txheej txheem smoother thiab smoother. Los ntawm nws cov yeeb yaj kiab zoo tshaj plaws thiab cov dej khaws cia, txheej txheem ua yeeb yam kom huv si, txhim kho cov txheej txheem ziab thiab ruaj khov ntawm txheej.
Pharmaceutical txheej: Hauv cov txheej txheem tshuaj, cellulose ethers xws li HPMC feem ntau yog siv los ua txheej txheej txheej. Cov yeeb yaj kiab zoo tsim cov khoom ntawm cellulose ether thiab muaj peev xwm tswj tau qhov ziab kom qhuav tuaj yeem ua kom muaj kev sib haum xeeb thiab kev ncaj ncees ntawm txheej txheej thiab txhim kho kev ruaj ntseg thiab tso tawm cov yam ntxwv ntawm cov tshuaj.
Cellulose ether muaj cov teebmeem tseem ceeb hauv kev txhim kho adhesion thiab zaj duab xis-tsim cov khoom los ntawm nws cov thickening, water-retaining, thiab film-forming zog. Nws daim ntawv thov dav hauv kev tsim kho, txheej txheej, tshuaj thiab lwm yam haujlwm ua pov thawj nws lub luag haujlwm tseem ceeb hauv kev txhim kho adhesion thiab zaj duab xis-tsim cov khoom. Nyob rau hauv lub neej yav tom ntej, nrog rau kev txhim kho tas mus li ntawm cellulose ether ntau lawm technology thiab kev loj hlob ntawm tshiab cellulose ether cov khoom, cellulose ether yuav nthuav dav daim ntawv thov kev cia siab nyob rau hauv ntau lub teb.
Post lub sij hawm: Lub Xya hli ntuj-13-2024