HPMC (hydroxypropyl methylcellulose) yog cov khoom siv uas tsis yog-ionic dej-soluble polymer, dav siv hauv tshuaj, khoom noj khoom haus, kev tsim kho, kev saib xyuas tus kheej thiab lwm yam haujlwm.
1. Cov yam ntxwv zoo
Cov qauv molecular ntawm HPMC muaj viscosity siab thiab zoo rheological zog. Muaj ntau pawg hydroxyl pawg (-OH) ntawm nws cov saw molecular, uas tuaj yeem tsim cov hydrogen bonds nrog cov dej molecules, kom HPMC tuaj yeem yaj tau zoo hauv dej los tsim cov tshuaj viscosity colloidal siab. Cov cuab yeej no tso cai rau HPMC ua kom tuab hauv cov mis thiab ua kom cov viscosity ntawm cov khoom.
2. Thickening nyhuv
Cov nyhuv thickening ntawm HPMC yog ua tiav los ntawm kev sib cuam tshuam ntawm nws cov saw hlau molecular. Thaum HPMC yaj nyob rau hauv dej, cov saw hlau molecular yuav entangle nrog ib leeg los tsim ib tug network qauv, yog li ua kom cov viscosity ntawm cov tshuaj. Cov nyhuv thickening no tshwj xeeb tshaj yog pom nyob rau hauv cov khoom ua kua (xws li dej haus, condiments) thiab muab tshuaj txhuam (xws li tshuaj pleev, cov khoom siv tawv nqaij), uas tuaj yeem txhim kho qhov saj thiab kev siv ntawm cov khoom.
3. Txhim khu kev ruaj ntseg
Los ntawm kev nce viscosity, HPMC tuaj yeem txhim kho kev ruaj ntseg ntawm cov khoom. Nyob rau hauv ntau yam suspensions thiab emulsions, nce viscosity tuaj yeem tiv thaiv cov sedimentation thiab theem sib cais ntawm cov khoom, yog li tswj cov uniformity thiab cov tsos ntawm cov khoom. Piv txwv li, hauv cov coatings thiab adhesives, kev siv HPMC tuaj yeem txhim kho qhov kev ruaj ntseg ntawm cov khoom thiab tiv thaiv qhov tshwm sim ntawm sedimentation thiab stratification.
4. Tswj kev tso tawm ua haujlwm
Hauv kev lag luam tshuaj, HPMC feem ntau yog siv los ua ib feem ntawm cov tshuaj tswj kev tso tawm. Los ntawm kev kho qhov concentration thiab molecular hnyav ntawm HPMC, kev txhawb nqa thiab tswj kev tso tawm ntawm cov tshuaj tuaj yeem ua tiav. Cov khoom o ntawm HPMC hauv dej tso cai rau kev tso tawm cov tshuaj hauv lub cev kom tswj tau, yog li txhim kho kev ua tau zoo ntawm cov tshuaj thiab txo cov kev mob tshwm sim.
5. dav adaptability
HPMC tseem tuaj yeem tuav cov khoom ua kom tuab zoo hauv ib puag ncig nrog pH qhov sib txawv thiab lub zog ionic, uas ua rau nws ua haujlwm hauv ntau cov qauv tsim. Txawm hais tias nws yog acidic, alkaline lossis nruab nrab, HPMC tuaj yeem muab cov viscosity ruaj khov thiab txhim kho cov khoom siv.
6. Tsawg concentration efficiency
Piv nrog rau lwm cov thickeners, HPMC tuaj yeem ua kom cov viscosity ntawm qis dua, txo cov nqi tsim khoom. Nyob rau tib lub sijhawm, qhov tsis tshua muaj siab no tuaj yeem txo qhov cuam tshuam rau lwm cov khoom xyaw thiab tswj kom yooj yim thiab ruaj khov ntawm cov mis.
7. Muaj feem cuam tshuam
Cov nyhuv thickening ntawm HPMC cuam tshuam los ntawm ntau yam, suav nrog hom HPMC (xws li qhov hnyav ntawm molecular sib txawv, hydroxyl hloov), kev daws qhov kub thiab txias, ion concentration, thiab lwm yam. Hauv cov ntawv thov tshwj xeeb, nws yog ib qho tsim nyog yuav tsum tau hloov kho raws li qhov xav tau. ntawm cov khoom kom ua tiav qhov zoo tshaj plaws viscosity nyhuv.
8. Daim ntawv thov piv txwv
Hauv kev lag luam khoom noj khoom haus, HPMC feem ntau siv los ua cov khoom noj muaj roj tsawg thiab cov khoom noj siv mis los pab txhim kho saj thiab sib xws. Hauv kev tsim kho kev lag luam, HPMC yog siv hauv cov khoom siv cement los txhim kho adhesion thiab ua haujlwm tau zoo. Hauv kev lag luam tshuaj, HPMC tau siv dav hauv cov ntsiav tshuaj, tshuaj ntsiav thiab ntau hom tshuaj los txhim kho lawv cov fluidity thiab stability.
Lub luag haujlwm ntawm HPMC hauv kev txhim kho cov khoom viscosity tsis tuaj yeem kwv yees tau qis dua. Nws cov khoom tshwj xeeb lub cev thiab tshuaj lom neeg ua rau nws yog qhov tseem ceeb ntawm cov thickener thiab stabilizer hauv ntau qhov kev lag luam. Thaum xaiv thiab thov HPMC, nws yog ib qho tsim nyog yuav tsum ua kom muaj qhov sib npaug thiab siv raws li cov yam ntxwv thiab kev xav tau ntawm cov khoom tshwj xeeb los muab kev ua si tag nrho rau nws qhov zoo.
Post lub sij hawm: Oct-21-2024