HPMC: ntau yam polymer rau kev siv architectural

Hydroxypropylmethylcellulose (HPMC) yog dej-soluble polymer muab tau los ntawm cellulose. Nws yog cov hmoov dawb dawb rau cov hmoov dawb siv rau ntau yam kev siv xws li kev tsim kho, tshuaj, khoom noj, khoom tu tus kheej thiab textiles. Hauv kev tsim kho, HPMC yog siv los ua cov thickener, binder, emulsifier thiab dej tuav tus neeg sawv cev. Nws yog ib qho tseem ceeb ntawm cov khoom siv cement thiab feem ntau siv rau hauv mortars, plasters, plasters thiab pobzeb adhesives.

Cov khoom siv tshuaj lom neeg ntawm HPMC

HPMC yog ib tug polymer tsim los ntawm cov tshuaj tiv thaiv ntawm cellulose nrog propylene oxide thiab methyl chloride. Cov txheej txheem synthesis suav nrog hloov cov pawg hydroxyl hauv cellulose nrog methyl thiab hydroxypropyl pawg. Qhov kev hloov pauv no ua rau tsim cov dej-soluble thiab nonionic polymers uas ruaj khov nyob rau ntau yam ntawm pH. Cov qauv tshuaj ntawm HPMC tuaj yeem hloov kho los ntawm kev hloov cov qib ntawm kev hloov pauv, molar hloov pauv thiab qib viscosity. Cov kev hloov kho no tuaj yeem txhim kho kev ua haujlwm ntawm HPMCs hauv ntau daim ntawv thov, suav nrog kev tsim kho.

Lub cev muaj zog ntawm HPMC

Lub cev lub cev ntawm HPMC nyob ntawm seb qhov kev hloov pauv, molar hloov pauv thiab qib viscosity. HPMC yog cov hmoov dawb mus rau dawb, tsis muaj ntxhiab thiab tsis qab. Nws yog soluble nyob rau hauv dej thiab tsim ib tug ntshiab, pob tshab kua tov. Lub viscosity ntawm cov tshuaj HPMC tuaj yeem hloov kho los ntawm kev hloov cov concentration ntawm cov polymer, pH ntawm cov tshuaj, thiab qhov kub thiab txias. HPMC cov kev daws teeb meem yog ruaj khov nyob rau hauv ntau qhov kub thiab txias thiab tsis tsim cov gels lossis precipitates ntawm qhov txias.

Lub luag haujlwm ntawm HPMC hauv kev tsim kho

HPMC yog siv rau hauv kev tsim kho raws li kev hloov kho rheology, dej tuav tus neeg sawv cev thiab cov nplaum. Rheology modifiers yog cov khoom uas tuaj yeem hloov tus cwj pwm ntws ntawm cov ntaub ntawv, xws li mortar lossis plaster. HPMC tuaj yeem ua kom cov viscosity ntawm mortar lossis plaster tsis cuam tshuam rau nws qhov kev ua haujlwm lossis sijhawm teem sijhawm. Qhov no muab cov khoom ruaj khov dua thiab txo qhov kev pheej hmoo ntawm sagging los yog collapsing thaum lub sij hawm thov.

Cov dej-retaining agents yog cov khoom uas muaj peev xwm ua kom cov dej tuav cov ntaub ntawv. HPMC khaws cov dej noo hauv cov khoom siv cement xws li mortars thiab plasters ntev dua li lwm cov khoom ntxiv. Cov cuab yeej no pab tiv thaiv cov khoom los ntawm ziab sai heev, uas tuaj yeem ua rau tawg thiab tsis muaj zog.

Binders yog cov khoom uas tuaj yeem txhim kho qhov adhesion ntawm cov khoom mus rau lub substrate. HPMC tuaj yeem txhim kho lub zog ntawm cov pobzeb nplaum los ntawm kev tsim cov yeeb yaj kiab nyias ntawm cov nplaum thiab cov substrate. Cov yeeb yaj kiab txhim kho lub peev xwm ntub dej ntawm cov nplaum thiab tso cai rau nws tsim kom muaj kev sib raug zoo nrog cov substrate.

Qhov zoo ntawm HPMC hauv kev tsim kho

Muaj ntau qhov zoo rau kev siv HPMC hauv kev tsim kho:

1. Txhim kho kev ua haujlwm: HPMC tuaj yeem txhim kho kev ua haujlwm ntawm mortars thiab stuccoes los ntawm kev ua kom lawv sib xws thiab txo qhov kev pheej hmoo ntawm kev sib cais.

2. Ua kom muaj kev sib koom ua ke: HPMC tuaj yeem txhim kho kev sib koom ua ke ntawm cov khoom siv cement los ntawm kev ua kom lawv cov viscosity thiab dej tuav.

3. Lub zog sib txuas zoo dua: HPMC tuaj yeem txhim kho lub zog sib txuas ntawm cov nplais nplaum los ntawm kev tsim cov yeeb yaj kiab nyias ntawm cov nplaum thiab cov substrate.

4. Dej tsis kam: HPMC tuaj yeem txhim kho cov dej tsis kam ntawm cov khoom siv cement xws li cov nplais nplaum los ntawm kev txhim kho cov dej tuav thiab txo cov porosity ntawm cov khoom siv cement.

5. Tshuaj tiv thaiv: HPMC tuaj yeem txhim kho cov tshuaj tiv thaiv ntawm cov khoom siv cement los ntawm kev txhim kho cov dej tuav ntawm cov khoom siv cement thiab txo lawv cov reactivity.

Hauv kev xaus

HPMC yog cov khoom siv ntau yam polymer dav siv los ua tus hloov kho rheology, dej tuav tus neeg sawv cev thiab cov nplaum hauv kev tsim kho. Nws cov khoom tshwj xeeb ua rau nws muaj qhov tseem ceeb hauv cov khoom siv cementitious xws li mortars, plasters, plasters thiab pobzeb nplaum. Siv HPMC hauv kev tsim kho tuaj yeem txhim kho kev ua haujlwm, kev sib koom ua ke, kev sib koom ua ke, kev tiv thaiv dej thiab tshuaj lom neeg ntawm cov khoom no. Raws li lub chaw tsim khoom HPMC, peb muab ntau yam ntawm HPMC qib kom tau raws li cov kev xav tau tshwj xeeb ntawm peb cov neeg siv khoom. Tiv tauj peb kom paub ntau ntxiv txog peb cov khoom thiab kev pabcuam.