Gypsum joint compound, tseem hu ua drywall av nkos lossis yooj yim sib koom ua ke, yog cov khoom siv siv hauv kev tsim kho thiab kho cov phab ntsa ntub dej. Nws yog feem ntau tsim los ntawm gypsum hmoov, ib tug mos sulfate ntxhia uas tov nrog dej los ua ib tug muab tshuaj txhuam. Cov tshuaj no yog tom qab ntawd siv rau cov seams, fab, thiab qhov khoob ntawm cov phab ntsa ntub dej kom tsim tau ib qho chaw du, seamless.
Hydroxypropyl methylcellulose (HPMC) yog cellulose ether uas feem ntau ntxiv rau cov ntaub ntawv sib koom ua ke rau ntau yam laj thawj. HPMC yog muab los ntawm cellulose, ib tug natural polymer pom nyob rau hauv cov nroj tsuag cell phab ntsa. Nov yog qee qhov tseem ceeb ntawm kev siv HPMC hauv plaster sib koom ua ke:
Kev tuav dej: HPMC paub txog nws cov dej tuav zoo heev. Thaum ntxiv rau plaster sib koom ua ke, nws pab tiv thaiv qhov sib tov kom qhuav sai sai. Lub sijhawm ua haujlwm txuas ntxiv ua rau nws yooj yim rau kev thov thiab ua tiav cov khoom sib koom ua ke.
Txhim kho kev ua tau zoo: Qhov sib ntxiv ntawm HPMC txhim kho cov txheej txheem ntawm kev sib koom ua ke. Nws muab cov smoother sib xws, ua kom yooj yim rau kev thov thiab siv rau cov phab ntsa ntub dej. Qhov no yog qhov tseem ceeb tshwj xeeb rau kev ua tiav cov txiaj ntsig zoo tshaj plaws.
Adhesion: HPMC pab cov sib koom ua ke ua raws li cov phab ntsa ntub dej. Nws pab cov khoom sib txuas ruaj khov rau cov seams thiab cov pob qij txha, ua kom muaj kev ruaj khov thiab ntev ntev thaum cov khoom dries.
Txo shrinkage: Gypsum cov ntaub ntawv sib koom ua ke yuav ntsws thaum lawv qhuav. Qhov sib ntxiv ntawm HPMC pab txo qis qis thiab txo qhov tshwm sim ntawm cov kab nrib pleb tshwm rau ntawm qhov chaw tiav. Qhov no yog qhov tseem ceeb kom tau txais txiaj ntsig zoo thiab kav ntev.
Air Entraining Agent: HPMC kuj ua raws li tus neeg saib xyuas huab cua. Qhov no txhais tau tias nws pab koom nrog microscopic huab cua npuas rau hauv cov khoom siv seam, txhim kho nws qhov kev ua tau zoo thiab ua haujlwm ntev.
Consistency Control: HPMC muab kev tswj xyuas ntau dua ntawm kev sib koom ua ke. Qhov no pab txhawb kom ua tiav qhov xav tau kev ntxhib los mos thiab tuab thaum thov.
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias cov txheej txheem tshwj xeeb ntawm gypsum sib koom cov ntaub ntawv yuav txawv ntawm cov chaw tsim khoom mus rau cov chaw tsim khoom, thiab cov qib sib txawv ntawm HPMC tuaj yeem siv nyob ntawm seb cov khoom xav tau ntawm cov khoom kawg. Tsis tas li ntawd, lwm yam additives xws li thickeners, binders thiab retarders tuaj yeem suav nrog hauv kev tsim los txhim kho kev ua tau zoo.
Hydroxypropyl methylcellulose (HPMC) cellulose ether plays lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm, adhesion thiab tag nrho kev ua haujlwm ntawm gypsum sib koom ua ke siv hauv kev tsim kho phab ntsa qhuav thiab kho. Nws cov khoom siv ntau yam pab ua kom tiav qhov du thiab ruaj khov ntawm cov phab ntsa ntub dej.
Post lub sij hawm: Jan-29-2024