(1) Taw qhia
Hydroxypropyl methylcellulose (HPMC) yog cov dej-soluble cellulose ether dav siv hauv cov xim latex. Nws tuaj yeem cuam tshuam rau cov khoom rheological, sag kuj thiab nto smoothness ntawm cov xim latex. Txawm li cas los xij, hauv kev siv tswv yim, cov cuab yeej tseem ceeb ntawm HPMC ib leeg yuav tsis txaus kom ua tau raws li txhua qhov kev xav tau, yog li yuav tsum tau ntsuas tshwj xeeb txhawm rau txhim kho nws cov kav ntev hauv cov xim latex.
(2) Mechanism of action of HPMC
HPMC txhim kho lub zog thiab tawv ntawm cov xim pleev xim los ntawm kev tsim cov qauv sib txuas hauv cov xim latex. Nws muaj ntau yam haujlwm tseem ceeb:
Txhim kho rheological zog: HPMC tuaj yeem kho cov viscosity ntawm cov xim latex, muab kev tsim kho tsim nyog, thiab txo qis qis.
Txhim kho txheej txheej: nws tuaj yeem sib npaug faib cov xim thiab cov fillers kom ntseeg tau tias qhov sib xws thiab nto du ntawm cov xim xim.
Ua kom cov yeeb yaj kiab ua kom muaj zog: HPMC tuaj yeem ua ke nrog cov dej molecules los pab cov xim zaj duab xis thiab tuav nws cov tawv thiab lub zog.
(3) Cov yam ntxwv cuam tshuam rau kev ua haujlwm ntawm HPMC
Thaum txhim kho qhov kav ntev ntawm HPMC hauv cov xim latex, cov hauv qab no yuav tsum tau xav txog:
Kev ua tau zoo ntawm HPMC: Cov khoom zoo HPMC tuaj yeem muab cov khoom siv tshuaj lom neeg ruaj khov thiab muaj zog tiv thaiv kev degradation.
Crack tsis kam ntawm cov xim zaj duab xis: Qhov tawg tsis kam ntawm cov xim zaj duab xis nyob ntawm qhov hnyav molecular thiab hloov qib ntawm HPMC, uas cuam tshuam rau nws lub peev xwm hla kev sib txuas thiab sib txuas nrog lwm cov khoom.
Ib puag ncig tej yam kev mob: Ib puag ncig yam xws li ultraviolet rays, av noo, thiab kub muaj feem xyuam rau kev ua tau zoo ntawm HPMC. HPMC ntau yam tsim nyog yuav tsum raug xaiv los daws cov teeb meem ntawm ntau qhov chaw.
(4) Cov tswv yim los txhim kho cov kav ntev ntawm HPMC
1. Txhim kho cov qauv tshuaj ntawm HPMC
Xaiv HPMC nrog rau qib tsim nyog ntawm kev hloov pauv tuaj yeem txhim kho nws qhov ruaj khov thiab ua haujlwm ntev hauv cov xim pleev xim. Feem ntau, HPMC nrog rau qib siab ntawm kev hloov pauv zoo dua rau hydrolysis thiab UV degradation. Tsis tas li ntawd, kev kho qhov hnyav molecular ntawm HPMC tuaj yeem cuam tshuam rau nws cov khoom rheological thiab cov khoom ua yeeb yaj kiab hauv cov xim latex.
2. Kev hloov kho cov qauv
Los ntawm kev hloov kho cov qauv ntawm cov xim latex, qhov ua tau zoo ntawm HPMC tuaj yeem ua kom tiav:
Siv cov khoom siv ua yeeb yaj kiab tsim nyog: Ntxiv cov yeeb yaj kiab-forming additives xws li ethylene glycol lossis propylene glycol tuaj yeem txhim kho qhov yooj yim ntawm HPMC hauv cov xim xim thiab txo qhov kev pheej hmoo ntawm kev tawg.
Ntxiv cov neeg ua haujlwm sib txuas: Cov kab sib txuas sib txuas tuaj yeem txhim kho kev sib txuas ntawm cov hlua khi polymer thaum tsim cov xim zaj duab xis, yog li txhim kho cov neeg kho tshuab lub zog thiab kav ntev ntawm cov xim zaj duab xis.
Kev siv cov stabilizers: Ntxiv cov tshuaj tua kab mob antioxidant thiab UV absorbers tuaj yeem txo qhov degradation ntawm HPMC thiab cov xim pleev xim rau cov yeeb yaj kiab thiab txuas ntxiv lawv lub neej kev pab cuam.
3. Txhim kho kev tsim kho tshuab
Txhim kho txoj kev tsim kho ntawm cov xim latex tuaj yeem cuam tshuam rau nws cov kav ntev:
Xim Xim Zaj Duab Xis Thickness: Ua kom cov xim pleev xim tsis sib xws yuav txo tau qhov ua rau ntawm zaj duab xis tawg thiab tawg.
Tswj kev tsim kho ib puag ncig: Kev tswj cov av noo thiab qhov kub thiab txias hauv qhov chaw tsim kho tuaj yeem txo qhov kev ntxhov siab thaum lub sijhawm kho ntawm cov xim zaj duab xis, yog li txhim kho nws cov kav ntev.
4. Multi-txheej txheej
Kev siv cov txheej txheem txheej txheej txheej txheej tuaj yeem ua kom muaj zog ntawm cov xim latex. Lub sij hawm kom qhuav txaus yog yuav tsum tau nyob nruab nrab ntawm txhua lub tsho tiv no ntawm cov xim kom ua tiav kev kho thiab kev sib txuas ntawm cov xim zaj duab xis.
5. Siv complex cellulose ethers
Los ntawm kev sib xyaw HPMC nrog lwm cov cellulose ethers xws li carboxymethylcellulose (CMC), cov khoom ntxiv tuaj yeem ua tiav, yog li kev txhim kho cov xim latex. Complex cellulose ethers tuaj yeem muab cov khoom zoo rheological thiab zaj duab xis toughness.
Kev txhim kho qhov ua tau zoo ntawm HPMC hauv cov xim latex yog ib txoj haujlwm zoo uas yuav tsum tau ua kom zoo dua los ntawm ntau yam xws li cov qauv tshuaj, kev hloov kho mis, thiab kev tsim kho tshuab. Kev sib xyaw ua ke ntawm HPMC zoo, cov khoom siv tsim nyog thiab kev tsim kho tsim nyog tuaj yeem txhim kho lub zog ntawm cov xim latex, ua rau nws muaj kev ua tau zoo thiab zoo li hauv ntau qhov chaw hnyav.
Lub sij hawm xa tuaj: Plaub Hlis-04-2024