Qhov teeb meem ntawm viscosity poob thaum lub sijhawm khaws cia xim yog qhov teeb meem tshwm sim, tshwj xeeb tshaj yog tom qab khaws cia ntev, viscosity ntawm cov xim txo qis heev, cuam tshuam rau kev ua haujlwm ntawm kev tsim kho thiab cov khoom zoo. Qhov txo qis ntawm viscosity yog cuam tshuam nrog ntau yam, xws li kub, av noo, cov kuab tshuaj volatilization, polymer degradation, thiab lwm yam, tab sis kev sib cuam tshuam nrog cov thickener cellulose ether yog qhov tseem ceeb heev.
1. Lub luag haujlwm tseem ceeb ntawm cellulose ether
Cellulose ether yog ib yam khoom ua kom tuab uas siv dav hauv cov xim pleev dej. Lawv lub luag haujlwm tseem ceeb suav nrog:
Cov nyhuv ua kom tuab: Cellulose ether tuaj yeem tsim cov qauv peb-seem ntawm lub network los ntawm kev nqus dej, yog li ua rau kom muaj viscosity ntawm lub kaw lus thiab txhim kho thixotropy thiab kev ua haujlwm ntawm cov xim.
Cov nyhuv ntawm kev ncua kev ruaj khov: Cellulose ether tuaj yeem tiv thaiv kev tso dej ntawm cov khoom khov xws li cov xim thiab cov khoom sau hauv cov xim thiab tswj qhov sib xws ntawm cov xim.
Cov khoom tsim zaj duab xis: Cellulose ether kuj tseem tuaj yeem cuam tshuam rau cov khoom tsim zaj duab xis ntawm cov xim, ua rau cov txheej muaj qee yam tawv thiab ruaj khov.
Muaj ntau hom cellulose ethers, suav nrog methyl cellulose (MC), hydroxyethyl cellulose (HEC), hydroxypropyl methyl cellulose (HPMC), thiab lwm yam. Cov ntaub ntawv no muaj kev yaj sib txawv, muaj peev xwm tuab thiab khaws cia tsis kam hauv cov txheej txheej.
2. Cov laj thawj tseem ceeb rau kev txo qis viscosity
Thaum lub sijhawm khaws cia cov txheej txheem, qhov txo qis viscosity feem ntau yog vim li cas hauv qab no:
(1) Kev puas tsuaj ntawm cellulose ethers
Qhov ua kom tuab ntawm cellulose ethers hauv cov txheej txheej nyob ntawm qhov loj ntawm lawv qhov hnyav molecular thiab kev ncaj ncees ntawm lawv cov qauv molecular. Thaum lub sijhawm khaws cia, cov yam xws li kub, acidity thiab alkalinity, thiab cov kab mob me me yuav ua rau muaj kev puas tsuaj ntawm cellulose ethers. Piv txwv li, thaum lub sijhawm khaws cia ntev, cov khoom acidic lossis alkaline hauv cov txheej txheej yuav hydrolyze cov saw molecular ntawm cellulose ether, txo nws qhov hnyav molecular, thiab yog li ua rau nws cov nyhuv tuab tsis muaj zog, ua rau muaj kev txo qis hauv viscosity.
(2) Kev ua kom cov kuab tshuaj yaj thiab kev hloov pauv ntawm cov dej noo
Kev ua kom cov kuab tshuaj yaj lossis cov dej noo hauv cov txheej txheej yuav cuam tshuam rau qhov xwm txheej solubility ntawm cellulose ether. Thaum lub sijhawm khaws cia, ib feem ntawm cov dej yuav ua pa lossis txav mus rau saum npoo ntawm cov txheej txheej, ua rau kev faib tawm ntawm cov dej hauv cov txheej txheej tsis sib xws, yog li cuam tshuam rau qib o ntawm cellulose ether thiab ua rau qhov viscosity txo qis hauv thaj chaw hauv zos.
(3) Kev tawm tsam los ntawm cov kab mob me me
Thaum khaws cia tsis zoo lossis cov tshuaj preservatives tsis ua haujlwm zoo, cov kab mob me me yuav loj hlob hauv cov txheej txheej. Cov kab mob me me tuaj yeem rhuav tshem cov cellulose ethers thiab lwm yam organic thickeners, ua rau lawv cov nyhuv thickening tsis muaj zog thiab ua rau qhov viscosity ntawm cov txheej txheej txo qis. Cov txheej txheej uas muaj dej, tshwj xeeb, yog ib puag ncig zoo rau cov kab mob me me loj hlob vim tias lawv muaj dej ntau.
(4) Kev laus kub siab
Nyob rau hauv qhov kub siab cia, cov qauv lub cev lossis tshuaj ntawm cov saw hlau molecular cellulose ether yuav hloov pauv. Piv txwv li, cellulose ethers feem ntau raug oxidation lossis pyrolysis ntawm qhov kub siab dua, ua rau muaj qhov tsis muaj zog ntawm cov nyhuv thickening. Qhov kub siab kuj ua rau cov kuab tshuaj volatilization thiab dej evaporation sai dua, ntxiv rau qhov cuam tshuam rau viscosity stability.
3. Cov txheej txheem los txhim kho kev ruaj khov ntawm cov txheej txheem
Yuav kom txo qhov txo qis ntawm viscosity thaum lub sijhawm khaws cia thiab txuas ntxiv lub neej cia ntawm cov txheej, cov kev ntsuas hauv qab no tuaj yeem ua tau:
(1) Xaiv cov cellulose ether zoo
Cov cellulose ethers sib txawv muaj kev ua tau zoo sib txawv ntawm kev ruaj khov cia. Cellulose ethers nrog qhov hnyav molecular siab feem ntau muaj cov teebmeem thickening zoo dua, tab sis lawv qhov kev ruaj khov cia tsis zoo, thaum cellulose ethers nrog qhov hnyav molecular qis dua yuav muaj kev ua tau zoo dua. Yog li ntawd, thaum tsim cov mis, cellulose ethers nrog kev ruaj khov cia zoo yuav tsum tau xaiv, lossis cellulose ethers yuav tsum tau sib xyaw nrog lwm cov thickeners kom txhim kho lawv qhov kev tiv thaiv cia.
(2) Tswj cov pH ntawm lub txheej
Qhov acidity thiab alkalinity ntawm lub txheej txheej muaj feem cuam tshuam tseem ceeb rau kev ruaj khov ntawm cellulose ethers. Hauv kev tsim cov qauv, tus nqi pH ntawm lub txheej txheej yuav tsum tau tswj kom tsis txhob muaj qhov chaw acidic lossis alkaline ntau dhau kom txo qhov kev puas tsuaj ntawm cellulose ethers. Tib lub sijhawm, ntxiv cov pH adjuster lossis buffer kom tsim nyog tuaj yeem pab tswj pH ntawm lub cev.
(3) Ua kom siv cov tshuaj preservatives ntau ntxiv
Yuav kom tiv thaiv tau kev puas tsuaj ntawm cov kab mob me me, yuav tsum ntxiv cov tshuaj preservatives kom txaus rau hauv txheej. Cov tshuaj preservatives tuaj yeem tiv thaiv kev loj hlob ntawm cov kab mob me me, yog li tiv thaiv cov organic tshuaj xws li cellulose ether kom tsis txhob lwj thiab tswj tau qhov ruaj khov ntawm txheej. Yuav tsum xaiv cov tshuaj preservatives tsim nyog raws li cov qauv txheej thiab qhov chaw khaws cia, thiab yuav tsum kuaj xyuas lawv cov txiaj ntsig tsis tu ncua.
(4) Tswj qhov chaw cia khoom
Qhov kub thiab av noo ntawm cov txheej txheej muaj feem cuam tshuam ncaj qha rau qhov ruaj khov ntawm viscosity. Cov txheej txheej yuav tsum tau khaws cia rau hauv qhov chaw qhuav thiab txias, zam qhov kub thiab txias thiab av noo kom txo cov kuab tshuaj volatilization thiab cellulose ether degradation. Tsis tas li ntawd, cov ntim khoom zoo kaw tau zoo tuaj yeem txo qhov kev tsiv teb tsaws chaw thiab evaporation ntawm dej thiab ncua qhov txo qis ntawm viscosity.
4. Lwm yam tseem ceeb uas cuam tshuam rau viscosity
Ntxiv rau cellulose ethers, lwm yam khoom hauv lub txheej txheem txheej kuj tseem yuav cuam tshuam rau qhov kev hloov pauv ntawm viscosity. Piv txwv li, hom thiab concentration ntawm cov pigments, qhov volatilization rate ntawm cov solvents, thiab qhov sib xws ntawm lwm cov thickeners lossis dispersants yuav cuam tshuam rau qhov viscosity stability ntawm lub txheej. Yog li ntawd, qhov kev tsim qauv ntawm cov mis txheej thiab kev sib cuam tshuam ntawm cov khoom kuj yog cov ntsiab lus tseem ceeb uas yuav tsum tau them sai sai rau.
Qhov txo qis ntawm viscosity thaum lub sijhawm khaws cia ntawm cov txheej yog cuam tshuam nrog cov yam xws li kev puas tsuaj ntawm cellulose ethers, cov kuab tshuaj volatilization, thiab kev tsiv teb tsaws chaw ntawm dej. Txhawm rau txhim kho qhov ruaj khov ntawm kev khaws cia ntawm cov txheej, yuav tsum xaiv cov cellulose ether hom tsim nyog, pH ntawm cov txheej yuav tsum tswj tau, kev ntsuas tiv thaiv xeb yuav tsum tau ua kom muaj zog, thiab qhov chaw khaws cia yuav tsum tau ua kom zoo. Los ntawm kev tsim cov mis tsim nyog thiab kev tswj hwm kev khaws cia zoo, qhov teeb meem ntawm viscosity txo qis thaum lub sijhawm khaws cia ntawm cov txheej tuaj yeem txo qis, thiab cov khoom ua tau zoo thiab kev sib tw ua lag luam tuaj yeem txhim kho.
Lub sijhawm tshaj tawm: Cuaj hlis-27-2024