Gypsum-raws li cov khoom lag luam yog qhov tseem ceeb hauv kev tsim kho thiab kev siv lag luam vim lawv cov khoom siv ntau yam. Txhim kho lawv cov yam ntxwv ua tau zoo xws li kev ua tau zoo thiab kev sib kis yog qhov tseem ceeb rau kev ua tau zoo thiab zoo. Ib txoj hauv kev zoo kom ua tiav cov kev txhim kho no yog kev koom ua ke ntawm cov hmoov txhuv nplej siab ethers. Cov hmoov txhuv nplej siab hloov pauv no ua lub luag haujlwm tseem ceeb hauv kev txhim kho kev ua haujlwm ntawm gypsum plasters, muab ntau yam txiaj ntsig ntawm rheology, adhesion, thiab stability.
Chemical Properties thiab Mechanism of Action
Starch ethers yog derivatives ntawm cov hmoov txhuv nplej siab ntuj uas tau hloov kho tshuaj los qhia txog kev sib txuas ether. Cov kev hloov kho feem ntau suav nrog hydroxypropylation, carboxymethylation, thiab cationization, ua rau hydroxypropyl starch ether (HPS), carboxymethyl starch ether (CMS), thiab cationic starch ether (CSE), feem. Cov kev hloov kho no hloov kho lub cev thiab tshuaj lom neeg cov khoom ntawm cov hmoov txhuv nplej siab, txhim kho nws txoj kev sib raug zoo nrog gypsum thiab nws lub peev xwm los hloov kho cov khoom rheological ntawm qhov sib tov.
Rheological Control: Cov hmoov txhuv nplej siab ethers cuam tshuam rau rheology ntawm gypsum-based khoom. Los ntawm kev cuam tshuam nrog dej, hmoov txhuv nplej siab ethers swell thiab tsim ib lub network zoo li gel. Lub network no tsub kom lub viscosity ntawm qhov sib tov, tiv thaiv kev sib cais ntawm cov khoom thiab ua kom muaj qhov sib xws. Kev txhim kho viscosity txhim kho kev ua haujlwm ntawm gypsum plasters, ua rau lawv yooj yim sib tov, thov, thiab du. Qhov kev tswj ntawm viscosity no kuj tso cai rau kev tuav tau zoo dua thiab txo qis sagging thiab poob thaum thov.
Kev tuav dej: Cov hmoov txhuv nplej siab ethers txhim kho cov dej tuav hauv gypsum sib tov. Lawv tsim ib qho kev thaiv uas ua rau cov dej ntws tawm qeeb qeeb, muab sijhawm ntau rau lub plaster teeb kom zoo. Kev txhim kho dej tuav kom muaj dej txaus ntawm cov gypsum crystals, ua rau muaj zog thiab ruaj khov khoom zaum kawg. Qhov no yog qhov tseem ceeb tshwj xeeb hauv qhov chaw kub lossis qhuav qhov chaw uas dej sai sai tuaj yeem cuam tshuam qhov kev ncaj ncees ntawm plaster.
Txhim kho Adhesion thiab Cohesion: Lub xub ntiag ntawm cov hmoov txhuv nplej siab ethers txhim kho cov adhesion ntawm gypsum plasters rau substrates thiab txhim kho cov cohesion ntawm plaster nws tus kheej. Qhov no yog ua tiav los ntawm kev tsim cov hydrogen bonds ntawm cov hmoov txhuv nplej siab molecules thiab cov gypsum hais, tsim kom muaj zog thiab sib cuam tshuam matrix. Txhim kho adhesion xyuas kom meej tias cov plaster tseem ruaj khov rau ntawm qhov chaw, thaum txhim kho cohesion tiv thaiv kev tawg thiab txhim kho tag nrho cov kav ntev ntawm plaster.
Cov txiaj ntsig zoo hauv cov khoom siv gypsum
Kev koom ua ke ntawm cov hmoov txhuv nplej siab ethers rau hauv cov khoom siv gypsum txhais rau ntau qhov zoo hauv kev tsim kho thiab kev siv hauv kev lag luam.
Txhim kho kev ua haujlwm: Txhim kho rheological zog txhais tau hais tias gypsum plasters tov nrog cov hmoov txhuv nplej siab ethers yooj yim ua hauj lwm nrog. Lawv tuaj yeem kis tau yooj yim dua thiab sib npaug, txo qhov kev siv dag zog uas xav tau thaum thov. Qhov kev txhim kho kev ua haujlwm tau zoo tshwj xeeb yog qhov muaj txiaj ntsig tshwj xeeb hauv kev tsim kho loj loj uas qhov ua tau zoo thiab siv tau yooj yim yog qhov tseem ceeb.
Lub Sijhawm Qhib Ntxiv: Kev txhim kho dej tuav cov khoom ntawm cov hmoov txhuv nplej siab ethers txuas ntxiv lub sijhawm qhib ntawm gypsum plasters. Lub sijhawm qhib yog hais txog lub sijhawm uas lub plaster tseem ua haujlwm ua ntej nws pib teeb. Lub sijhawm qhib ntev dua tso cai rau cov neeg ua haujlwm hloov kho thiab kho yam tsis muaj plaster teeb ua ntej. Qhov kev hloov pauv no yog qhov tseem ceeb hauv kev ua tiav kev ua tiav zoo, tshwj xeeb tshaj yog nyob rau hauv kev sib tw lossis cov ncauj lus kom ntxaws.
Txo Shrinkage thiab Cracking: Txhim kho dej tuav thiab txhim kho adhesion txo qhov kev pheej hmoo ntawm shrinkage thiab cracking nyob rau hauv cov khoom kawg. Cov hmoov txhuv nplej siab ethers pab tswj cov dej noo sib npaug hauv cov plaster, ua kom cov txheej txheem ziab kom zoo dua. Qhov no ua rau kom ruaj khov thiab tawg-resistant nto, uas yog qhov tseem ceeb rau kev zoo nkauj thiab kev ncaj ncees.
Environmental Benefits: Starch ethers yog muab los ntawm cov khoom siv txuas ntxiv dua tshiab, ua rau lawv ib puag ncig tus phooj ywg additive. Lawv siv nyob rau hauv gypsum-raws li cov khoom yuav txo tau qhov kev cia siab ntawm hluavtaws polymers thiab lwm yam uas tsis yog-renewable additives. Qhov no ua raws li qhov kev xav tau loj zuj zus ntxiv rau cov khoom siv hauv tsev thiab kev coj ua.
Daim ntawv thov nyob rau hauv ntau yam Gypsum-based khoom
Starch ethers pom daim ntawv thov nyob rau hauv ntau yam ntawm gypsum-raws li cov khoom, txhua yam tau txais txiaj ntsig los ntawm kev txhim kho cov txheej txheem thiab kev nthuav dav lawv muab.
Gypsum Plasters: Rau cov txheej txheem phab ntsa thiab qab nthab plasters, hmoov txhuv nplej siab ethers txhim kho qhov yooj yim ntawm daim ntawv thov thiab ua tiav zoo. Lawv pab ua kom tiav, txawm tias qhov chaw nrog qhov tsis xws luag, txo qhov kev xav tau ntawm kev ua tiav ntxiv.
Kev sib xyaw ua ke: Hauv cov khoom sib koom ua ke siv rau kev sib khi cov phab ntsa ntub dej, cov hmoov txhuv nplej siab ethers txhim khu kev sib kis tau thiab ua kom zoo, ua kom muaj kev sib khi thiab ruaj khov. Lawv kuj txhim kho qhov yooj yim ntawm sanding thaum lub compound tau qhuav, ua rau ib tug smoother zaum kawg nto.
Self-Leveling Compounds: Nyob rau hauv nws tus kheej-leveling pem teb tebchaw, hmoov txhuv nplej siab ethers pab mus rau lub ntws thiab leveling zog, xyuas kom meej ib tug tiaj tus thiab txawm nto. Lawv lub peev xwm khaws cia dej tiv thaiv kom qhuav ntxov ntxov thiab ua kom muaj kev kho kom zoo, ua rau hauv pem teb muaj zog thiab ruaj khov.
Gypsum Boards: Nyob rau hauv gypsum boards, hmoov txhuv nplej siab ethers txhim kho qhov adhesion ntawm gypsum core thiab daim ntawv hauv ob sab phlu, txhim khu lub board lub zog thiab ruaj khov. Qhov no yog qhov tseem ceeb heev rau kev tswj xyuas qhov kev ncaj ncees ntawm cov laug cam thaum tuav thiab teeb tsa.
Starch ethers sawv cev rau kev nce qib tseem ceeb hauv kev tsim cov khoom lag luam gypsum, muab kev txhim kho kev ua haujlwm thiab kev sib kis. Lawv lub peev xwm los tswj rheology, txhim kho dej tuav, thiab txhim kho adhesion txhais rau cov txiaj ntsig zoo xws li kev siv yooj yim dua, qhib lub sijhawm qhib, txo qis thiab tawg, thiab txhim kho tag nrho cov kav ntev. Raws li kev tsim kho kev lag luam txuas ntxiv hloov mus rau kev coj ua tau zoo dua thiab muaj txiaj ntsig zoo, kev siv cov hmoov txhuv nplej siab ethers hauv cov khoom siv gypsum yuav ua rau muaj kev cuam tshuam ntau dua, ua rau muaj txiaj ntsig zoo dua thiab cov khoom siv hauv tsev ntau dua.
Post lub sij hawm: Jun-03-2024