Hydroxypropyl methylcellulose (HPMC) yog cov khoom siv ntuj tsim los siv hauv ntau yam lag luam xws li khoom noj, tshuaj thiab kev tsim kho. Hauv kev lag luam coatings, HPMC yog suav tias yog cov khoom siv uas xav tau vim nws cov khoom tshwj xeeb, ua rau nws yog ib qho tseem ceeb ntawm cov txheej txheem ua haujlwm siab. Cov txheej ua los ntawm HPMC muaj nuj nqis rau lawv cov viscosity zoo, adhesion thiab dej tsis kam.
1. HPMC muaj cov khoom tuav dej zoo heev. Qhov no yog vim nws yog hydrophilic polymer, txhais tau tias nws muaj zog txaus nyiam rau cov dej molecules. Thaum HPMC ntxiv rau cov txheej txheem, nws pab khaws cov dej noo kom ntev, uas yog qhov tseem ceeb rau kev tswj xyuas qhov zoo thiab ruaj khov ntawm cov txheej. Cov txheej txheem uas tsis muaj cov dej tuav tau zoo tuaj yeem yooj yim puas los yog deteriorate thaum raug cov dej los yog cov av noo. Yog li ntawd, HPMC txhim kho cov dej tsis kam ntawm cov txheej txheem, ua kom nws haum rau siv nyob rau hauv ib puag ncig hnyav.
2. HPMC muaj cov khoom ua yeeb yaj kiab zoo heev. HPMC molecules muaj cov saw ntev uas tso cai rau lawv tsim cov yeeb yaj kiab muaj zog thaum cuam tshuam nrog lwm cov ntaub ntawv txheej xws li resins thiab pigments. Qhov no ua kom ntseeg tau tias cov xim ua los ntawm HPMC muaj qhov adhesion zoo thiab ua kom zoo rau saum npoo nws siv rau. Cov cuab yeej ua yeeb yaj kiab ntawm HPMC kuj tseem txhim kho lub sijhawm ntev ntawm cov txheej txheem, ua rau nws tsis kam ua kom puas thiab puas.
3. HPMC muaj kev sib raug zoo nrog lwm cov txheej txheem. Nws yog ntau yam khoom xyaw uas tuaj yeem muab ntxiv rau ntau hom txheej txheej tsis cuam tshuam rau nws qhov kev ua tau zoo. Qhov no txhais tau tias cov coatings ua los ntawm HPMC tuaj yeem hloov kho kom tau raws li cov kev xav tau tshwj xeeb, xws li kev txhim kho dej tsis kam, gloss lossis kev ntxhib los mos. Tsis tas li ntawd, HPMC tuaj yeem tsim nrog cov viscosities sib txawv, tso cai rau kev tsim cov txheej txheem nrog cov khoom siv sib txawv.
4. HPMC yog ib puag ncig tus phooj ywg thiab muaj toxicity tsawg. Qhov no ua rau nws muaj kev nyab xeeb rau kev siv cov coatings uas tuaj rau hauv kev sib cuag nrog cov zaub mov, dej los yog lwm yam ntaub ntawv rhiab heev. Cov txheej txheej ua los ntawm HPMC yog biodegradable thiab tsis muaj kev hem thawj rau ib puag ncig, ua rau lawv muaj kev xaiv zoo rau cov neeg siv khoom ib puag ncig.
5. HPMC yog ib qho yooj yim siv thiab tuav. Nws tuaj nyob rau hauv ntau yam ntaub ntawv xws li hmoov los yog tov thiab yog yooj yim soluble nyob rau hauv dej. Qhov no ua rau nws yooj yim rau kev sib xyaw nrog lwm cov ntaub ntawv txheej thiab ua kom ntseeg tau tias cov coatings ua los ntawm HPMC muaj qhov zoo sib xws thiab viscosity. Tsis tas li ntawd, HPMC yog ib qho tsis-ionic compound, uas txhais tau hais tias nws tsis cuam tshuam los ntawm pH ntawm cov xim pleev xim. Qhov no ua rau nws muaj qhov ruaj khov uas tuaj yeem siv rau hauv cov kua qaub lossis alkaline xim formulations.
6. HPMC muaj kev ua tau zoo nyob rau hauv qhov sib txawv ntawm qhov kub thiab txias. Cov txheej uas ua los ntawm HPMC yuav tsis ua nkig lossis tawg thaum raug kub tsawg. Lawv kuj tuav lawv cov khoom thaum raug cov av noo siab. Qhov no ua rau cov coatings ua los ntawm HPMC haum rau siv nyob rau hauv ntau qhov chaw, nrog rau huab cua huab cua.
7. HPMC muaj zoo solubility nyob rau hauv cov organic solvents. Cov cuab yeej no ua rau HPMC yooj yim muab tso rau hauv cov txheej txheem hnyav. Tsis tas li ntawd, vim hais tias HPMC yog ib qho tsis-ionic compound, nws tsis cuam tshuam rau cov khoom ntawm cov kuab tshuaj los yog kev ruaj ntseg ntawm txheej txheej. Qhov no ua rau HPMC yog cov khoom xyaw zoo tshaj plaws hauv ntau hom txheej txheej, nrog rau cov kuab tshuaj raws li txheej txheej.
Cov khoom tshwj xeeb ntawm HPMC ua rau nws yog ib qho khoom tseem ceeb hauv cov txheej txheem ua haujlwm siab. Nws cov dej tuav tau zoo heev, kev tsim cov yeeb yaj kiab, kev sib raug zoo, kev phooj ywg ib puag ncig, kev yooj yim ntawm kev siv, kev ua tau zoo thiab solubility ua rau nws tsim nyog siv ntau hom txheej txheej. Cov coatings ua los ntawm HPMC muaj nuj nqis rau lawv cov adhesion zoo, dej tsis kam thiab ua haujlwm ntev, ua rau lawv zoo tagnrho rau kev siv hauv qhov chaw hnyav. Vim nws muaj ntau yam, HPMC tuaj yeem hloov kho kom tau raws li cov kev xav tau tshwj xeeb, ua rau nws muaj kev xaiv nrov hauv kev lag luam coatings. Zuag qhia tag nrho, HPMC yog cov khoom muaj txiaj ntsig zoo uas tseem ceeb rau kev ua tiav ntawm cov txheej txheem ua haujlwm siab.
Post lub sij hawm: Oct-13-2023