qhia:
Cellulose ethers yog dav siv nyob rau hauv kev tsim kho kev lag luam vim lawv zoo heev tuav dej, thickening thiab bonding zog.Lawv txhim kho cov dej ntws thiab kev ua tiav ntawm cov khoom siv cement thiab txhim kho cov khoom siv ntawm cov khoom kawg.Putties feem ntau yog siv hauv kev tsim kho kev lag luam los sau cov kab nrib pleb, qhov thiab lwm yam tsis zoo hauv cov phab ntsa thiab qab nthab.Kev siv cov cellulose ethers hauv cov hmoov putty tuaj yeem txhim kho kev ua haujlwm, teeb tsa lub sijhawm thiab tag nrho cov khoom zoo.Kab lus no yuav tham txog cov txiaj ntsig ntawm cov viscosities sib txawv ntawm cellulose ethers ntawm putty hmoov.
Hom ntawm cellulose ethers:
Muaj ntau hom cellulose ethers xws li methylcellulose (MC), hydroxypropylmethylcellulose (HPMC), ethylcellulose (EC) thiab carboxymethylcellulose (CMC).HPMC yog ib qho nrov cellulose ether nyob rau hauv kev tsim kho kev lag luam vim nws cov dej tuav tau zoo, thickening thiab cov khoom nplaum.HPMC tuaj nyob rau hauv txawv viscosities, los ntawm qis mus rau siab.
Cov nyhuv ntawm cellulose ether ntawm putty hmoov:
Putty hmoov yog siv los sau cov kab nrib pleb, qhov thiab lwm yam tsis zoo hauv cov phab ntsa thiab qab nthab.Kev siv cov cellulose ethers hauv cov hmoov putty tuaj yeem txhim kho kev ua haujlwm thiab teeb tsa lub sijhawm ntawm cov khoom.Cellulose ether tuaj yeem txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm cov hmoov putty.Cov hauv qab no yog cov txiaj ntsig ntawm cov viscosities sib txawv ntawm cellulose ethers ntawm putty hmoov:
1. Tsawg viscosity HPMC:
Tsawg viscosity HPMC tuaj yeem txhim kho cov dej ntws thiab ua haujlwm ntawm cov hmoov putty.Nws kuj tseem txhim kho lub sijhawm teeb tsa ntawm cov khoom.Tsawg-viscosity HPMC muaj qhov qis dua gelation, uas tuaj yeem tiv thaiv cov hmoov putty los ntawm hardening sai heev.Nws tuaj yeem txhim kho qhov adhesion thiab cohesion ntawm cov khoom.Tsawg viscosity HPMC yog tsim rau cov hmoov putty xav tau kev ua haujlwm zoo thiab du.
2. Medium viscosity HPMC:
Nruab nrab viscosity HPMC tuaj yeem txhim kho cov khoom thixotropic ntawm putty hmoov.Nws tseem tuaj yeem txhim kho cov dej tuav thiab kev sib txuas ntawm cov khoom.Nruab nrab-viscosity HPMC tuaj yeem txhim kho cov khoom siv kho tshuab ntawm cov khoom, xws li lub zog thiab kav ntev.Nws yog tsim rau putty hmoov yuav tsum tau zoo tuav dej thiab cohesiveness.
3. High viscosity HPMC:
High viscosity HPMC tuaj yeem txhim kho cov thickening thiab anti-sag kev ua tau zoo ntawm putty hmoov.Nws tseem tuaj yeem txhim kho cov dej tuav thiab kev sib txuas ntawm cov khoom.High viscosity HPMC tuaj yeem txhim kho cov khoom siv kho tshuab ntawm cov khoom, xws li lub zog thiab kav ntev.Nws yog tsim rau putty hmoov uas yuav tsum tau siab thickening thiab anti-sag kev ua tau zoo.
nyob rau hauv xaus:
Cellulose ethers yog dav siv nyob rau hauv kev tsim kho kev lag luam vim lawv zoo heev tuav dej, thickening thiab bonding zog.HPMC tau dhau los ua cov cellulose ether nrov hauv kev tsim kho kev lag luam vim nws cov khoom zoo heev.HPMC tuaj nyob rau hauv txawv viscosities, los ntawm qis mus rau siab.Kev siv cov cellulose ethers nrog cov viscosities sib txawv tuaj yeem txhim kho kev ua haujlwm, teeb tsa lub sijhawm, thixotropic kev ua tau zoo, dej tuav, kev sib koom ua ke thiab kev ua haujlwm ntawm cov hmoov putty.Kev siv cov cellulose ethers tuaj yeem txhim kho qhov zoo thiab kev ua haujlwm ntawm cov hmoov putty, ua rau lawv haum rau ntau yam kev siv hauv kev tsim kho kev lag luam.
Post lub sij hawm: Lub Xya hli ntuj-20-2023