Qhov sib txawv ntawm lub cev thiab tshuaj lom neeg thiab kev siv ntawm HPMC thiab HEMC hauv kev tsim kho kev lag luam

Qhov sib txawv ntawm lub cev thiab tshuaj lom neeg thiab kev siv ntawm HPMC thiab HEMC hauv kev tsim kho kev lag luam

Hydroxypropyl Methylcellulose (HPMC) thiab Hydroxyethyl Methylcellulose (HEMC) yog ob hom cellulose ethers uas feem ntau siv hauv kev tsim kho kev lag luam. Thaum lawv qhia qee qhov zoo sib xws, kuj tseem muaj qee qhov sib txawv hauv lawv lub cev thiab tshuaj lom neeg, nrog rau lawv cov ntawv thov.

Lub cev muaj zog:

1. Solubility: HPMC thiab HEMC yog ob qho tib si dej-soluble, txhais tau tias lawv yaj yooj yim hauv dej los tsim cov tshuaj ntshiab. Txawm li cas los xij, qhov solubility ntawm HEMC zoo dua li ntawm HPMC.
2. Viscosity: Ob leeg HPMC thiab HEMC yog cov thickeners thiab pom tus cwj pwm pseudoplastic, uas txhais tau hais tias lawv cov viscosity txo qis thaum raug kev nyuaj siab shear. HEMC feem ntau muaj viscosity siab dua li HPMC.
3. Kev tuav dej: Ob leeg HPMC thiab HEMC paub txog lawv cov khoom tuav dej zoo, uas ua rau lawv muaj txiaj ntsig zoo hauv kev tsim kho qhov chaw tswj dej noo tseem ceeb.

Chemical Properties:

1. Chemical Structure: Qhov sib txawv tseem ceeb ntawm HPMC thiab HEMC nyob hauv lawv cov qauv tshuaj. HPMC muaj ib pab pawg hydroxypropyl txuas mus rau cellulose qaum, thaum HEMC muaj ib pawg hydroxyethyl txuas.
2. Tshuaj Reactivity: HPMC thiab HEMC yog nonionic cellulose ethers thiab yog li ntawd chemically ruaj khov. Txawm li cas los xij, HEMC muaj zog dua li HPMC vim muaj cov pab pawg ethyl, uas ua rau nws muaj kev cuam tshuam ntau dua rau hydrolysis.

Daim ntawv thov:

1. HPMC Daim Ntawv Thov: HPMC feem ntau siv rau hauv cov nplais nplaum, cov cement mortars, thiab cov khoom siv gypsum vim nws cov dej tuav tau zoo thiab cov khoom tuab. Nws kuj tseem siv rau sab nrauv rwb thaiv tsev thiab ua tiav tshuab (EIFS) txhawm rau txhim kho kev ua haujlwm ntawm cov mortar.
2. HEMC Daim Ntawv Thov: HEMC feem ntau yog siv hauv cov cement-based mortars, pobzeb nplaum, thiab cov khoom siv gypsum vim nws cov dej tuav tau zoo dua. Nws kuj yog siv nyob rau hauv tus kheej-leveling tebchaw, qhov twg nws ua raws li ib tug khiav tswj tus neeg saib xyuas.

Hauv cov ntsiab lus, HPMC thiab HEMC yog ob hom cellulose ethers uas feem ntau siv hauv kev tsim kho kev lag luam. Thaum lawv qhia qee qhov zoo sib xws, xws li lawv cov dej solubility, pseudoplastic cwj pwm, thiab cov dej tuav tau zoo, kuj tseem muaj qee qhov sib txawv ntawm lawv lub cev thiab tshuaj lom neeg, nrog rau lawv cov kev siv. HPMC feem ntau yog siv rau hauv cov nplais nplaum, cov cement mortars, thiab cov khoom siv gypsum, thaum HEMC feem ntau siv hauv cov cement-based mortars, pobzeb nplaum, thiab cov khoom sib txuas ntawm tus kheej.