HPMC rau kev tsim kho

Hydroxypropyl methyl cellulose (HPMC) yog non-ionic cellulose ether muab los ntawm ntuj cellulose. Nws yog dav siv nyob rau hauv kev tsim kho raws li ib tug thickening tus neeg sawv cev, binder, dispersant, emulsifier, film-forming agent, tiv thaiv colloid, thiab suspending agent.

HPMC yog cov hmoov dawb dawb, tsis muaj ntxhiab, tsis qab, thiab tsis muaj tshuaj lom. Nws yog soluble nyob rau hauv dej txias thiab tsim ib tug ntshiab, viscous tov. Nws yog insoluble hauv cov kuab tshuaj organic xws li ethanol, acetone, thiab benzene. HPMC yog ib qho anionic polysaccharide tsim los ntawm cov kab sib txuas ntawm D-glucose units txuas los ntawm β-1,4-glycosidic bonds. Nws yog tsim los ntawm cov tshuaj tiv thaiv ntawm methyl chloride thiab hydroxypropyl chloride nrog cellulose.

HPMC tau siv dav hauv kev tsim kho vim nws cov khoom zoo heev. Nws tuaj yeem siv los ua tus neeg sawv cev thickening los ua kom cov viscosity ntawm cov tshuaj aqueous thiab txhim kho kev ua haujlwm ntawm cov cement thiab mortar. Nws kuj tseem tuaj yeem siv los ua cov ntaub ntawv los txhim kho cov adhesion ntawm cov cement thiab mortar rau substrates. HPMC tseem tuaj yeem siv los ua cov khoom tawg los txo cov dej xav tau ntawm cov cement thiab mortar thiab txhim kho lawv txoj haujlwm. Tsis tas li ntawd, HPMC tuaj yeem siv los ua emulsifier los txhim kho kev ruaj ntseg ntawm cov cement thiab mortar sib tov.

HPMC tseem tuaj yeem siv los ua cov yeeb yaj kiab tsim los txhim kho cov dej tsis kam ntawm cov cement thiab mortar. Nws tseem tuaj yeem siv los ua kev tiv thaiv colloid kom txo tau qhov nro ntawm cov cement thiab mortar thiab txhim kho lawv txoj haujlwm. Thaum kawg, HPMC tuaj yeem siv los ua tus neeg sawv cev ncua los txhim kho qhov kev ncua ntawm cov cement thiab mortar sib tov.

HPMC yog ib qho khoom siv tau zoo thiab muaj ntau yam ntxiv rau kev tsim kho. Nws tuaj yeem txhim kho kev ua haujlwm ntawm cov cement thiab mortar, txo lawv cov dej thov, txhim kho lawv cov adhesion rau substrates, thiab txhim kho lawv cov dej tsis kam. Tsis tas li ntawd, nws tuaj yeem siv los ua emulsifier, tus neeg sawv cev ua yeeb yaj kiab, kev tiv thaiv colloid, thiab tus neeg sawv cev ncua. HPMC yog ib qho kev lag luam thiab kev nyab xeeb ntxiv uas tuaj yeem siv los txhim kho kev ua haujlwm ntawm cov cement thiab mortar sib tov.