HPMC (Hydroxypropyl Methylcellulose) yog ib qho tshuaj ntxiv uas feem ntau siv hauv tsev plaster, tshwj xeeb tshaj yog hauv kev txhim kho cov dej tsis kam, rheological zog thiab kev tsim kho ntawm plaster.
1. Txhim kho cov dej tuav ntawm plaster
HPMC yog cov dej-soluble polymer compound uas tuaj yeem tsim cov qauv sib txuas hauv cov cement lossis gypsum-based plaster. Cov qauv no pab khaws cov dej thiab tiv thaiv cov cement lossis gypsum los ntawm kev poob dej sai heev thaum lub sij hawm hardening txheej txheem, yog li tsis txhob tawg los yog txo cov dej tsis kam. Los ntawm kev ntxiv qhov tsim nyog ntawm HPMC rau lub plaster, cov txheej txheem hydration ntawm cov cement tuaj yeem ncua sij hawm, ua rau cov plaster muaj peev xwm khaws dej zoo dua. Lub hydrate tsim los ntawm cov cement thaum lub sij hawm hydration txheej txheem yuav tsum muaj dej txaus los txhawb cov tshuaj tiv thaiv. Kev ncua kev poob dej tuaj yeem txhim kho qhov ceev thiab tiv thaiv kev nkag mus ntawm cov khoom kawg.
2. Txhim kho qhov adhesion thiab ntom ntawm plaster
Raws li ib tug polymer additive, HPMC tsis tau tsuas yog txhim khu lub rheological zog ntawm plaster, tab sis kuj txhim kho nws adhesion. Thaum HPMC ntxiv, lub zog sib txuas ntawm plaster yog txhim kho, uas pab nws tsim kom muaj zog adhesion rau lub substrate (xws li cib, pob zeb lossis gypsum phab ntsa). Nyob rau tib lub sijhawm, HPMC ua rau lub plaster tsim cov qauv denser thaum lub sij hawm hardening txheej txheem, txo qhov muaj ntawm capillary pores. Tsawg pores txhais tau hais tias nws yog qhov nyuaj rau cov dej nkag mus, yog li txhim kho cov dej tsis kam ntawm plaster.
3. Txhim kho permeability kuj
Cov qauv molecular ntawm HPMC tuaj yeem tsim cov khoom zoo li colloid nyob rau hauv plaster, tso cai rau lub plaster tsim ib qho microstructure thaum lub sij hawm kho. Raws li cov qauv txhim kho, plaster nto ua smoother thiab denser, thiab cov permeability ntawm dej yog txo. Yog li ntawd, cov dej tsis kam ntawm plaster yog txhim kho, tshwj xeeb tshaj yog nyob rau hauv qhov chaw ntub dej lossis dej nplua nuj, qhov sib ntxiv ntawm HPMC tuaj yeem tiv thaiv kom tsis txhob ya raws ntawm phab ntsa los ntawm txheej plaster.
4. Txhim kho durability thiab waterproofness
Kev tiv thaiv dej tsis yog tsuas yog nyob ntawm qhov muaj peev xwm tsis muaj dej tsis zoo ntawm cov khoom siv saum npoo, tab sis kuj tseem cuam tshuam nrog cov qauv sab hauv ntawm plaster. Los ntawm kev ntxiv HPMC, lub cev thiab tshuaj lom neeg ruaj khov ntawm plaster tuaj yeem txhim kho. HPMC txhim kho cov tshuaj tiv thaiv corrosion ntawm plaster thiab zam cement corrosion los ntawm dej nkag. Tshwj xeeb tshaj yog nyob rau hauv lub sij hawm ntev dej immersion los yog av ib puag ncig, HPMC pab mus cuag lub neej kev pab cuam ntawm plaster thiab txhim khu nws anti-aging zog.
5. Kho viscosity thiab workability
HPMC kuj muaj kev ua haujlwm ntawm kev kho viscosity thiab rheological zog. Hauv kev tsim kho tiag tiag, qhov tsim nyog viscosity tuaj yeem ua rau lub plaster tsis yooj yim ntws thaum siv, thiab tuaj yeem sib npaug ntawm phab ntsa yam tsis ua rau lub plaster ntog thaum tsim kho vim muaj dej ntau dhau. Los ntawm kev tswj cov kev ua haujlwm ntawm plaster, cov neeg ua haujlwm tsim kho tuaj yeem tswj tau qhov sib xws ntawm plaster zoo dua, yog li indirectly txhim kho cov dej tsis zoo ntawm plaster.
6. Txhim khu kev tiv thaiv tawg
Thaum lub sij hawm tsim kho, plaster yog feem ntau shrinkage vim lwm yam xws li kub hloov thiab av noo hloov, ua rau tawg. Lub xub ntiag ntawm cov kab nrib pleb tsis tsuas yog cuam tshuam rau cov tsos ntawm plaster, tab sis kuj muab cov channel rau dej nkag. Qhov sib ntxiv ntawm HPMC tuaj yeem ua kom lub zog ntawm plaster, ua rau nws muaj zog tawg tsis kam thaum lub sijhawm ziab, yog li tsis txhob ya raws nkag mus rau sab hauv los ntawm cov kab nrib pleb thiab txo qhov kev pheej hmoo ntawm dej nkag.
7. Txhim kho adaptability thiab kev tsim kho yooj yim
Qhov sib ntxiv ntawm HPMC kuj tuaj yeem ua rau plaster ntau yoog raws nyob rau hauv cov huab cua sib txawv. Nyob rau hauv ib qho chaw kub kub, noo noo ntawm plaster evaporates sai heev thiab yog nquag tawg. Lub xub ntiag ntawm HPMC pab cov plaster khaws dej hauv qhov chaw qhuav, kom nws txoj kev kho ceev yog tswj tau thiab cov kab nrib pleb thiab cov txheej dej tsis zoo los ntawm kev ziab sai dhau yog zam. Tsis tas li ntawd, HPMC kuj tseem tuaj yeem txhim kho qhov adhesion ntawm plaster, kom nws tuaj yeem tswj tau qhov adhesion zoo ntawm qhov chaw sib txawv thiab tsis yooj yim rau poob.
HPMC ua lub luag haujlwm tseem ceeb hauv kev txhim kho cov dej tsis kam ntawm plaster, feem ntau los ntawm cov hauv qab no:
Kev tuav dej: ncua cov cement hydration, khaws cov dej noo, thiab tiv thaiv kom qhuav sai heev.
Adhesion thiab ntom: txhim khu lub adhesion ntawm plaster rau lub hauv paus nto thiab tsim ib tug ntom qauv.
Permeability kuj: txo qhov pores thiab tiv thaiv dej nkag.
Durability thiab waterproofness: txhim kho cov tshuaj lom neeg thiab lub cev ruaj khov ntawm cov khoom thiab ua rau lub neej ua haujlwm ntev.
Kev tiv thaiv kev sib tsoo: ua kom lub zog ntawm plaster thiab txo qhov tsim ntawm cov kab nrib pleb.
Kev tsim kho yooj yim: Txhim kho cov khoom rheological ntawm plaster thiab txhim kho kev ua haujlwm thaum siv. Yog li ntawd, HPMC tsis yog tsuas yog ib qho ntxiv los txhim kho kev tsim kho ntawm plaster, tab sis kuj txhim kho cov dej tsis kam ntawm plaster los ntawm ntau cov txheej txheem, kom cov plaster tuaj yeem tswj tau qhov kev ruaj ntseg zoo thiab ua haujlwm ntev hauv ntau qhov chaw hnyav.
Post lub sij hawm: Nov-20-2024