Taw qhia
Cellulose ethers, tshwj xeeb tshaj yog Methyl Hydroxyethyl Cellulose (MHEC), tau siv dav hauv ntau lub lag luam rau lawv cov khoom zoo kawg li. MHEC yog ib qho kev hloov kho cellulose derivative uas txhim kho kev ua haujlwm ntawm cov nplaum thiab cov sealants zoo heev. Qhov sib xyaw no muaj ntau yam txiaj ntsig, suav nrog kev txhim kho viscosity, dej tuav, ua haujlwm, thiab ruaj khov. Kev nkag siab txog cov txheej txheem tshwj xeeb uas MHEC txhim kho cov nplaum nplaum thiab cov khoom sib khi tuaj yeem muab kev nkag siab zoo rau nws cov ntawv thov thiab qhov zoo hauv cov kev lag luam no.
Txhim kho Viscosity thiab Rheology
Ib qho tseem ceeb ntawm MHEC txhim kho kev ua haujlwm ntawm cov nplaum thiab cov sealants yog los ntawm nws qhov cuam tshuam rau viscosity thiab rheology. MHEC molecules, thaum yaj hauv dej, tsim cov kua dej khov heev. Qhov no nce viscosity yog qhov tseem ceeb rau cov nplaum thiab cov sealants vim nws ua kom muaj kev tswj xyuas ntau dua, txo cov khoom lag luam khiav lossis sag. Cov cuab yeej no tshwj xeeb tshaj yog muaj txiaj ntsig zoo rau kev siv ntsug uas tuav txoj haujlwm ntawm cov nplaum los yog sealant yog qhov tseem ceeb.
Kev coj tus cwj pwm rheological imparted los ntawm MHEC pab ua kom tiav thixotropic xwm nyob rau hauv adhesives thiab sealants. Thixotropy hais txog cov cuab yeej ntawm qee cov gels lossis cov kua dej uas tuab (viscous) nyob rau hauv cov xwm txheej zoo li qub tab sis ntws (ua kom qis dua) thaum ntxhov siab lossis ntxhov siab. Qhov no txhais tau hais tias cov nplaum thiab cov sealants uas muaj MHEC tuaj yeem siv tau yooj yim thaum siv cov shear (piv txwv li, thaum txhuam los yog troweling) tab sis rov qab tau lawv cov viscosity sai sai thaum daim ntawv thov raug tshem tawm. Cov yam ntxwv no yog qhov tseem ceeb rau kev tiv thaiv sagging thiab dripping, kom ntseeg tau tias cov khoom nyob rau hauv qhov chaw kom txog thaum nws kho.
Txhim khu kev tuav dej
MHEC paub txog nws cov peev xwm khaws dej zoo heev. Nyob rau hauv cov ntsiab lus ntawm adhesives thiab sealants, cov cuab yeej no tseem ceeb heev. Kev tuav dej yog qhov tseem ceeb hauv kev ua kom muaj kev kho kom zoo thiab teeb tsa cov ntaub ntawv no. Cov dej noo txaus yog tsim nyog rau cov txheej txheem hydration hauv cement-based adhesives, thiab hauv lwm hom adhesives, nws xyuas kom meej tias cov nplaum tseem ua haujlwm tau ntev dua ua ntej teeb tsa.
Cov cuab yeej tuav dej ntawm MHEC pab tswj cov nplaum nplaum los yog cov sealant lub hydration lub xeev, uas yog ib qho tseem ceeb rau kev ua tiav cov nyiaj tau los siab tshaj plaws. Hauv cov cement-based adhesives, MHEC tiv thaiv kom qhuav ntxov ntxov, uas tuaj yeem ua rau dej tsis tiav thiab txo lub zog. Rau cov sealants, tswj kom muaj dej txaus kom zoo ib yam kev ntxhib los mos thiab yoog raws thaum thov thiab kho.
Txhim kho kev ua haujlwm thiab kev siv cov cuab yeej
Kev suav nrog MHEC hauv cov nplaum thiab cov khoom sib khi ua kom muaj txiaj ntsig zoo rau lawv txoj haujlwm thiab kev yooj yim ntawm kev thov. Cov nyhuv lubricating ntawm MHEC txhim kho kev sib kis ntawm cov khoom no, ua rau lawv yooj yim dua los siv nrog cov cuab yeej xws li trowels, txhuam hniav, lossis cov tshuaj tsuag. Cov cuab yeej no tseem ceeb tshwj xeeb hauv kev tsim kho thiab DIY daim ntawv thov uas yooj yim ntawm kev siv tuaj yeem cuam tshuam rau kev ua tau zoo thiab kev ua haujlwm zoo.
Tsis tas li ntawd, MHEC pab txhawb kom smoothness thiab sib xws ntawm cov nplaum los yog sealant. Qhov kev sib txuam no ua kom ntseeg tau tias cov khoom siv tuaj yeem siv rau hauv nyias, txawm tias txheej txheej, uas yog qhov tseem ceeb rau kev ua tiav kev sib raug zoo thiab kev sib khi. Kev txhim kho kev ua haujlwm kuj tseem txo cov kev siv dag zog uas yuav tsum tau siv rau hauv daim ntawv thov, ua rau cov txheej txheem ua haujlwm tsawg dua thiab ua haujlwm zoo dua.
Ntxiv sijhawm qhib thiab sijhawm ua haujlwm
Lwm qhov txiaj ntsig tseem ceeb ntawm MHEC hauv cov nplaum nplaum thiab cov sealants yog lub sijhawm qhib thiab sijhawm ua haujlwm. Lub sij hawm qhib yog hais txog lub sij hawm uas cov nplaum nplaum tseem tacky thiab tuaj yeem tsim ib daim ntawv cog lus nrog lub substrate, thaum lub sij hawm ua hauj lwm yog lub sij hawm lub sij hawm uas cov nplaum los yog sealant tuaj yeem hloov kho lossis hloov kho tom qab thov.
MHEC lub peev xwm khaws dej thiab tswj cov viscosity pab kom ncua sij hawm ntev, muab cov neeg siv tau yooj yim dua thaum thov. Lub sijhawm qhib txuas ntxiv no yog qhov tshwj xeeb tshaj yog nyob rau hauv cov haujlwm nyuaj uas yuav tsum tau muab tso rau thiab kev kho kom haum. Nws kuj tseem txo qhov kev pheej hmoo ntawm kev teeb tsa ntxov ntxov, uas tuaj yeem cuam tshuam rau daim ntawv cog lus zoo.
Txhim kho Adhesion thiab Cohesion
MHEC txhim kho ob qho tib si adhesion thiab cohesion zog ntawm adhesives thiab sealants. Adhesion yog hais txog lub peev xwm ntawm cov khoom los lo rau lub substrate, thaum cohesion yog hais txog lub zog sab hauv ntawm cov khoom nws tus kheej. Kev txhim kho cov dej tuav thiab viscosity ntawm MHEC pab txhawb kom nkag mus rau hauv cov ntxeem tau zoo dua, txhim kho cov nplaum nplaum.
Tsis tas li ntawd, daim ntawv thov sib xws thiab kev tswj xyuas tau yooj yim los ntawm MHEC kom ntseeg tau tias cov nplaum nplaum los yog cov khoom sib khi ua kom muaj kev sib raug zoo thiab txuas ntxiv nrog rau cov substrate. Qhov no uniformity pab nyob rau hauv maximizing qhov chaw tiv tauj thiab lub zog ntawm cov nplaum daim ntawv cog lus. Cov khoom sib txuas kuj tseem txhim kho, vim tias cov khoom tuav nws txoj kev ncaj ncees thiab tsis tawg los yog tev tawm ntawm lub substrate.
Resistance rau Environmental Factors
Adhesives thiab sealants feem ntau raug rau ntau yam ib puag ncig xws li kub hloov pauv, av noo, thiab tshuaj lom neeg raug. MHEC pab txhawb rau kev ua haujlwm ntev thiab kev ua haujlwm ntawm cov ntaub ntawv no nyob rau hauv cov xwm txheej zoo li no. Cov dej tuav cov khoom ntawm MHEC pab tswj qhov yooj thiab elasticity ntawm sealants, uas yog qhov tseem ceeb rau kev ua kom thermal expansion thiab contraction tsis muaj cracking.
Ntxiv mus, MHEC txhim kho qhov tsis kam ntawm cov nplaum thiab cov sealants rau degradation los ntawm ultraviolet (UV) lub teeb thiab oxidation. Qhov kev txhim kho ruaj khov no ua kom ntseeg tau tias qhov kev ua tau zoo ntawm cov nplaum los yog cov sealant tseem zoo ib yam nyob rau lub sijhawm, txawm tias nyob rau hauv ib puag ncig hnyav.
Compatibility nrog lwm yam additives
MHEC yog sib xws nrog ntau yam ntawm lwm yam additives siv nyob rau hauv adhesives thiab sealants. Qhov kev sib raug zoo no tso cai rau cov qauv tsim los ua ke MHEC nrog rau lwm cov khoom siv ntxiv kom ua tiav cov yam ntxwv tshwj xeeb. Piv txwv li, MHEC tuaj yeem siv nrog cov khoom siv yas, cov khoom ntim, thiab cov stabilizers txhawm rau txhim kho kev yooj yim, txo qis, thiab txhim kho kev ua haujlwm tag nrho.
Qhov kev ua tau zoo no ua rau MHEC yog ib qho tseem ceeb hauv kev tsim cov nplaum nplaum thiab cov sealants, ua rau kev txhim kho cov khoom tsim nyog rau cov kev siv tshwj xeeb thiab kev ua haujlwm.
Methyl Hydroxyethyl Cellulose (MHEC) txhawb nqa kev ua tau zoo ntawm cov nplaum thiab cov sealants los ntawm nws cov khoom tshwj xeeb. Los ntawm kev txhim kho viscosity, dej tuav, ua haujlwm tau zoo, lub sijhawm qhib, adhesion, thiab kev tiv thaiv ib puag ncig, MHEC xyuas kom meej tias cov nplaum thiab cov sealants ua tau zoo hauv ntau daim ntawv thov. Nws compatibility nrog rau lwm yam additives txuas ntxiv nws cov khoom siv, ua rau nws yog ib qho tseem ceeb muaj nyob rau hauv lub formulation ntawm high-kev ua tau zoo adhesives thiab sealants. Raws li kev lag luam txuas ntxiv xav tau cov khoom siv nrog kev ua tau zoo thiab kev ntseeg tau zoo, lub luag haujlwm ntawm MHEC hauv cov nplaum nplaum thiab cov sealants zoo li yuav ua tau zoo dua.
Post lub sij hawm: May-24-2024