Qhia:
Cov neeg hais txog cellulose tau siv dav hauv kev tsim kho kev tsim kho vim lawv cov dej ua kom zoo, thickening thiab tsev neeg. Lawv txhim kho kev ntws thiab txheej txheem ntawm cov ntaub ntawv casent-raws li cov khoom siv thiab txhim kho cov khoom siv tshuab ntawm cov khoom kawg. Putties yog feem ntau siv nyob rau hauv kev tsim kho kev tsim kho kom sau cov kab nrib pleb, qhov thiab lwm yam tsis txaus ntseeg hauv cov phab ntsa thiab nthab. Kev siv cov cellulose muaj kev pab cuam tshuam nrog putty hmoov tuaj yeem txhim kho kev ua haujlwm, teeb tsa lub sijhawm thiab tag nrho cov khoom lag luam zoo. Kab lus no yuav tham txog cov nyhuv ntawm viscosities txawv ntawm cellulose neeg muaj kev pab hais txog putty hmoov.
Hom ntawm cov cellulose muaj neeg muaj cai:
Muaj ntau yam sib txawv ntawm cov cellulose neeg muaj kev cuam tshuam nrog methylcellulose (MC), HydroxyprropenCelylose (urmc) thiab carboxymethylcelleculose (cmc). HPMC yog cov cellulose nrov ether hauv kev tsim kho kev tsim kho vim nws txoj kev cia dej zoo, thickening thiab nplaum cov khoom. HPMC los nyob rau hauv viscosities sib txawv, los ntawm qis rau siab.
Cov nyhuv ntawm cellulose ether ntawm putty hmoov:
Putty hmoov yog siv los sau cov kab nrib pleb, qhov thiab lwm yam kev tsis txaus ntseeg hauv phab ntsa thiab nthab. Kev siv cov cellulose muaj cov neeg muaj kev pab cuam putty powders tuaj yeem txhim kho kev ua haujlwm thiab lub sijhawm teeb lub sijhawm ntawm cov khoom. Cellulose ether kuj tseem tuaj yeem txhim kho cov haujlwm ua haujlwm thiab cov nplaum ntawm hmoov. Cov hauv qab no yog cov txiaj ntsig ntawm cov viscosities sib txawv ntawm cellulose muaj kev hais ua rau putty hmoov:
1. Muaj viscosity HPMC:
Tsis muaj viscosity HPMC tuaj yeem txhim kho fluidity thiab kev ua haujlwm ntawm hmoov putty. Nws kuj tseem txhim kho lub sijhawm teem sijhawm ntawm cov khoom. Low-viscosity HPMC muaj qis dua gelation kub, uas tuaj yeem tiv thaiv cov hmoov uas muaj sia ntawm qhov tawv dhau los. Nws kuj tseem tuaj yeem txhim kho cov nplaum thiab cohesion ntawm cov khoom. Tsis muaj viscosity HPMC yog qhov tsim nyog rau cov hmoov ua kom muaj hmoov thiab du.
2. Nruab nrab viscosity HPMC:
Nruab nrab viscosity HPMC tuaj yeem txhim kho cov khoom siv thixotropic ntawm cov hmoov putty. Nws kuj tseem tuaj yeem txhim kho cov dej khaws cia thiab ua haujlwm ntawm cov khoom. Nruab nrab-viscosity HPMC tuaj yeem txhim kho cov khoom siv mecha tshuab ntawm cov khoom lag luam, xws li muaj zog thiab kav ntev. Nws yog qhov haum rau cov hmoov ua kom muaj hmoov uas xav tau cov dej kom zoo thiab cohesiveness.
3. High viscosity HPMC:
Siab viscosity HPMC tuaj yeem txhim kho cov thickening thiab anti-sag kev ua haujlwm ntawm putty hmoov. Nws kuj tseem tuaj yeem txhim kho cov dej khaws cia thiab ua haujlwm ntawm cov khoom. Siab viscosity HPMC tuaj yeem txhim kho cov khoom siv tshuab ntawm cov khoom lag luam, xws li muaj zog thiab kav ntev. Nws yog qhov haum rau cov hmoov ua kom muaj hmoov kom muaj cov tuab tuab thiab tiv thaiv kev ua haujlwm ntawm sab sag.
Hauv kev xaus:
Cov neeg hais txog cellulose tau siv dav hauv kev tsim kho kev tsim kho vim lawv cov dej ua kom zoo, thickening thiab tsev neeg. HPMC tau dhau los ua lub cellulose nrov ether hauv kev tsim kho kev tsim kho vim yog nws cov khoom tau zoo. HPMC los nyob rau hauv viscosities sib txawv, los ntawm qis rau siab. Kev siv cov cellulose cov neeg muaj cai nrog cov viscosities txawv tuaj yeem txhim kho lub sijhawm, kev ua haujlwm lub sijhawm, kev ua haujlwm hauv tsev thiab cov khoom siv me me ntawm cov hmoov putty. Kev siv cov cellulose cov neeg muaj cai txhim kho tau zoo thiab ua tau zoo ntawm pattty hmoov, ua rau lawv haum rau ntau yam kev siv hauv kev tsim kho.
Lub Sijhawm Post: Jul-20-2023