Hydroxypropyl methylcellulose yog cov dej-soluble polymer nrov uas tsim cov kua dej ntshiab thiab ruaj khov hauv dej thiab siv dav hauv kev lag luam tshuaj, zaub mov thiab kev tsim kho. Nws yog cov khoom siv tsis-ionic cellulose-raws li raw khoom uas txhim kho kev sib raug zoo thiab cohesive zog ntawm cov khoom kawg. Txhawm rau kom ntseeg tau tias qhov ua tau zoo ntawm hydroxypropyl methylcellulose, cov khoom yuav tsum tau kuaj thiab tsim nyog ua ntej siv. Hauv tsab xov xwm no, peb yuav tham txog peb txoj hauv kev txhim khu kev qha los qhia qhov zoo ntawm hydroxypropyl methylcellulose.
1. Kev ntsuas viscosity
Lub viscosity ntawm hydroxypropyl methylcellulose yog ib qho tseem ceeb parameter los txiav txim nws qhov zoo. Viscosity yog qhov tsis kam ntawm cov kua dej ntws thiab ntsuas hauv centipoise (cps) lossis mPa.s. Lub viscosity ntawm hydroxypropyl methylcellulose sib txawv raws li nws qhov hnyav molecular thiab qib ntawm kev hloov pauv. Qhov siab dua qhov kev hloov pauv, qhov viscosity ntawm cov khoom qis dua.
Txhawm rau kuaj cov viscosity ntawm hydroxypropyl methylcellulose, yaj me me ntawm cov khoom hauv dej thiab siv lub viscometer los ntsuas qhov viscosity ntawm cov tshuaj. Lub viscosity ntawm cov tshuaj yuav tsum nyob rau hauv qhov pom zoo los ntawm tus neeg muag khoom. Cov khoom lag luam zoo zoo hydroxypropyl methylcellulose yuav tsum muaj cov viscosity zoo ib yam, uas yog qhov qhia txog kev purity thiab cov khoom me me.
2. Kev sim hloov pauv
Qib ntawm kev hloov pauv yog hais txog qhov sib piv ntawm cov pawg hydroxyl ntawm cellulose hloov los ntawm hydroxypropyl lossis methyl pawg. Lub degree ntawm kev hloov pauv yog qhov qhia txog cov khoom purity, qhov siab dua qhov kev hloov pauv, cov khoom purer. Cov khoom lag luam zoo hydroxypropyl methylcellulose yuav tsum muaj kev hloov pauv siab.
Txhawm rau kuaj cov qib ntawm kev hloov pauv, titration yog ua nrog sodium hydroxide thiab hydrochloric acid. Txiav txim siab npaum li cas ntawm sodium hydroxide xav tau los nruab nrab hydroxypropyl methylcellulose thiab xam cov qib ntawm kev hloov pauv siv cov qauv hauv qab no:
Degree of Hloov = ([Volume of NaOH] x [Molarity of NaOH] x 162) / ([Weight of Hydroxypropyl Methyl Cellulose] x 3)
Qhov kev hloov pauv yuav tsum nyob rau hauv qhov kev pom zoo muab los ntawm tus neeg muag khoom. Qhov kev hloov pauv ntawm cov khoom zoo hydroxypropyl methylcellulose yuav tsum nyob rau hauv qhov kev pom zoo.
3. Solubility kuaj
Lub solubility ntawm hydroxypropyl methylcellulose yog lwm qhov tseem ceeb parameter txiav txim nws zoo. Cov khoom yuav tsum yooj yim soluble nyob rau hauv dej thiab tsis tsim lumps los yog gels. Cov khoom lag luam zoo hydroxypropyl methylcellulose yuav tsum yaj sai thiab sib npaug.
Txhawm rau ua qhov kev xeem solubility, yaj me me ntawm cov khoom hauv dej thiab do cov tshuaj kom txog thaum yaj tag. Cov tshuaj yuav tsum yog ntshiab thiab tsis muaj pob los yog gels. Yog tias cov khoom tsis yaj yooj yim los yog tsim cov pob los yog cov gels, nws yuav yog ib qho kev qhia tsis zoo.
Hauv kev xaus, hydroxypropyl methylcellulose yog ib qho tseem ceeb raw khoom siv nyob rau hauv ntau yam lag luam. Txhawm rau kom ntseeg tau tias cov khoom lag luam zoo, viscosity, hloov pauv thiab solubility kuaj tau ua tiav. Cov kev ntsuam xyuas no yuav pab kom nkag siab meej txog cov yam ntxwv ntawm cov khoom thiab pab kom paub qhov txawv ntawm nws qhov zoo. High-quality hydroxypropyl methylcellulose muaj viscosity zoo ib yam, qib siab hloov pauv, thiab yaj sai sai thiab sib npaug hauv dej.
Post lub sij hawm: Lub Xya hli ntuj-11-2023