Hydroxypropyl methylcellulose (HPMC), raws li cov khoom siv tshuaj polymer feem ntau, tau dhau los ua ntau thiab siv ntau dua hauv kev tsim kho kev lag luam, tshwj xeeb tshaj yog cov nplaum nplaum, hauv xyoo tas los no. Nws tuaj yeem tsis tsuas yog txhim kho kev tsim kho ntawm cov pobzeb nplaum, tab sis kuj tseem ua kom nws lub zog sib txuas, yog li txhim kho kev tsim kho thiab kev pabcuam lub neej.
Cov yam ntxwv tseem ceeb ntawm HPMC thiab nws cov txheej txheem ntawm kev ua
HPMC yog cov tshuaj hloov kho dej-soluble polymer nrog cov thickening zoo heev, dej tuav, lubrication thiab ua cov yeeb yaj kiab. Cov khoom no ua rau nws yog ib qho zoo tagnrho additive rau ntau yam khoom siv hauv tsev. Hauv cov nplais nplaum, lub luag haujlwm tseem ceeb ntawm HPMC tau pom hauv cov hauv qab no:
Kev tuav dej: HPMC muaj peev xwm tuav dej tau zoo heev. Nws tuaj yeem kaw cov dej noo ntau thaum lub sij hawm daim ntawv thov txheej txheem thiab ncua lub sij hawm evaporation ntawm dej. Cov dej tuav cov nyhuv no tuaj yeem tsis tsuas yog ncua lub sijhawm qhib ntawm cov nplaum, tab sis kuj xyuas kom meej tias cov nplaum nplaum muaj cov dej txaus los koom rau hauv cov tshuaj tiv thaiv dej thaum lub sij hawm hardening txheej txheem, yog li txhim kho lub zog sib txuas.
Thickening nyhuv: HPMC tuaj yeem ua kom cov viscosity ntawm cov nplaum thiab ua rau nws muaj thixotropy zoo. Qhov no txhais tau hais tias cov nplaum tuav lub siab viscosity thaum so, tab sis ua kom yooj yim rau kev sib kis thaum sib xyaw lossis siv, uas pab txhim kho kev ua haujlwm thiab kev ua haujlwm ntawm daim ntawv thov. Nyob rau tib lub sijhawm, cov nyhuv thickening kuj tuaj yeem txhim kho qhov pib ntawm cov nplaum nplaum kom ntseeg tau tias cov vuas tsis yooj yim rau plam thaum pib.
Lubrication thiab Rheological Properties: HPMC lub lubrication thiab rheological zog txhim kho cov hauj lwm ntawm cov pobzeb nplaum. Nws tuaj yeem txo qhov kev sib txhuam sab hauv tsim los ntawm cov nplaum thaum lub sijhawm tsim kho, ua rau kev tsim kho smoother. Cov nyhuv lubrication no ua rau cov vuas sib npaug sib npaug thiab txo qhov khoob uas tshwm sim los ntawm daim ntawv thov tsis sib xws, yog li txhim kho cov ntawv cog lus ntxiv.
Zaj duab xis-forming zog: HPMC tuaj yeem tsim ib zaj duab xis nyias ntawm cov nplais pobzeb nplaum thiab muaj cov dej tsis zoo thiab cov tshuaj tiv thaiv corrosion. Cov cuab yeej ua yeeb yaj kiab no yog qhov kev pabcuam zoo rau kev ruaj ntseg ntev ntawm cov nplais pobzeb adhesives, tshwj xeeb tshaj yog nyob rau hauv qhov chaw ntub dej. Nws tuaj yeem tiv thaiv kom tsis txhob ya raws kev nkag mus thiab ua kom muaj kev ruaj ntseg ntev ntawm kev sib raug zoo.
Cov nyhuv ntawm HPMC rau kev txhim kho daim ntawv cog lus muaj zog
Hauv kev tsim cov nplais nplaum, kev sib khi lub zog yog ib qho tseem ceeb ntsuas ntsuas nws qhov zoo. Kev sib raug zoo tsis txaus yuav ua rau muaj teeb meem xws li cov pobzeb tawg thiab blistering, cuam tshuam rau kev tsim kho kom zoo. HPMC txhim kho lub zog sib txuas ntawm cov nplais nplaum los ntawm nws cov khoom ntawm lub cev thiab tshuaj lom neeg. Cov hauv qab no yog ib qho kev ntsuam xyuas tshwj xeeb ntawm HPMC ua tiav txoj haujlwm no:
Optimize hydration cov tshuaj tiv thaiv: HPMC lub peev xwm khaws cia dej tso cai rau cov cement lossis lwm yam khoom siv hydraulic hauv cov nplais nplaum kom ua rau muaj kev cuam tshuam tag nrho. Cov muaju uas tsim thaum lub sij hawm hydration ntawm cov cement thiab lwm yam ntaub ntawv yuav tsim ib tug muaj zog daim ntawv cog lus nrog rau saum npoo ntawm ceramic vuas thiab substrates. Cov tshuaj tiv thaiv no yuav ua tiav ntau dua nyob rau hauv muaj cov dej noo txaus, yog li txhim kho kev sib raug zoo zog.
Txhim kho qhov kev sib cuag zoo ntawm qhov chaw sib txuas: HPMC tuaj yeem tswj tau qhov dej zoo thiab lubrication ntawm cov pobzeb nplaum thaum tso, yog li xyuas kom meej tias cov nplaum tuaj yeem npog txhua lub ces kaum ntawm sab nraub qaum ntawm cov pobzeb thiab cov substrate kom tsis txhob muaj qhov khoob thiab qhov tsis sib xws. Qhov sib xws thiab kev ncaj ncees ntawm qhov chaw sib cuag yog ib qho tseem ceeb uas txiav txim siab lub zog ntawm kev sib raug zoo, thiab lub luag haujlwm ntawm HPMC hauv qhov no tsis tuaj yeem tsis quav ntsej.
Kev txhim kho thawj zaug adhesion: Vim lub thickening nyhuv ntawm HPMC, pobzeb adhesives muaj viscosity ntau dua thaum thawj zaug thov, uas txhais tau hais tias cov vuas tuaj yeem tam sim ntawd ua raws li cov substrate yam tsis tau plam yooj yim. Kev txhim kho thawj zaug adhesion pab cov vuas luaj ceramic kom sai thiab ruaj khov, txo lub sijhawm hloov kho thaum lub sijhawm tsim kho thiab ua kom muaj kev ruaj khov ntawm daim ntawv cog lus.
Txhim khu kev ua kom tawg thiab ua kom tawv tawv: Cov yeeb yaj kiab tsim los ntawm HPMC tuaj yeem tsis tsuas yog txhim kho cov dej tsis kam thiab tshuaj lom neeg corrosion ntawm cov nplais nplaum, tab sis kuj muab qee qhov toughness thiab tawg tsis kam. Qhov no toughness ua rau cov nplaum kom zoo dua tiv thaiv thermal expansion thiab contraction kev nyuaj siab nyob rau hauv ib puag ncig, tsis txhob muaj kab nrib pleb los ntawm kev hloov nyob rau hauv sab nraud kub los yog deformation ntawm lub hauv paus cov ntaub ntawv, thiab yog li tswj lub stability ntawm lub zog ntawm kev sib raug zoo.
Cov txiaj ntsig siv tau
Hauv kev siv cov tswv yim, cov nplais nplaum ntxiv nrog HPMC qhia tau zoo heev ntawm kev sib raug zoo thiab kev tsim kho. Hauv kev sim sib piv, kev sib txuas lub zog ntawm cov nplais nplaum uas muaj HPMC nce li ntawm 20% mus rau 30% piv rau cov khoom tsis muaj HPMC. Qhov kev txhim kho tseem ceeb no tsis tsuas yog txhim kho tag nrho cov kev ua tau zoo ntawm cov nplaum, tab sis kuj tseem txuas ntxiv lub neej kev pab cuam ntawm cov pobzeb installation, tshwj xeeb tshaj yog nyob rau hauv qhov chaw ntub dej lossis kub kub.
Tsis tas li ntawd, cov dej tuav cov nyhuv ntawm HPMC txuas ntxiv lub sijhawm qhib ntawm cov nplaum, muab cov neeg ua haujlwm tsim kho ntau lub sijhawm los hloov kho thiab kho. Qhov kev hloov pauv no yog qhov tseem ceeb tshwj xeeb hauv cov phiaj xwm loj hauv kev tsim kho vim tias nws txhim kho kev ua haujlwm zoo thiab txo qhov muaj peev xwm rov ua haujlwm dua.
Raws li ib qho tseem ceeb ntxiv hauv cov nplais nplaum, HPMC tuaj yeem txhim kho lub zog ntawm cov pobzeb nplaum los ntawm kev txhim kho dej tuav, thickening, lubrication thiab zaj duab xis-tsim zog. Thaum ua kom muaj kev tsim kho kom zoo thiab kav ntev, HPMC kuj tseem txhim kho kev tsim kho thiab ua haujlwm tau zoo. Nrog rau kev nce qib ntawm thev naus laus zis thiab kev txhim kho txuas ntxiv ntawm cov ntaub ntawv tshawb fawb, HPMC daim ntawv thov kev cia siab nyob rau hauv kev tsim kho kev lag luam yuav dav dua, thiab nws lub luag haujlwm hauv kev ua kom zoo dua ntawm cov nplais pobzeb nplaum kuj tseem yuav ua haujlwm ntxiv.
Post lub sij hawm: Sep-25-2024