1. Cov teeb meem tshwm sim hauv cov hmoov putty
Kev ziab sai yog feem ntau yog vim muaj cov hmoov tshauv calcium ntxiv (loj heev, cov hmoov tshauv calcium hmoov siv hauv cov mis putty tuaj yeem txo kom tsim nyog) muaj feem xyuam rau cov dej tuav tus nqi ntawm cov fiber ntau, thiab nws kuj muaj feem xyuam rau. dryness ntawm phab ntsa.
Peeling thiab curling muaj feem xyuam rau cov dej tuav tus nqi, uas yog ib qho yooj yim tshwm sim thaum lub viscosity ntawm cellulose yog tsawg los yog tus nqi ntawm ntxiv yog me me.
Cov hmoov tshem tawm ntawm sab hauv phab ntsa putty hmoov muaj feem xyuam rau cov hmoov tshauv calcium ntxiv (cov hmoov tshauv calcium hmoov hauv cov hmoov putty tsawg dhau los yog cov purity ntawm cov hmoov tshauv calcium hmoov tsawg dhau, thiab cov hmoov tshauv ntau dhau. calcium hmoov nyob rau hauv cov hmoov putty hmoov yuav tsum tsim nyog ntxiv). Nyob rau tib lub sijhawm, nws kuj tseem cuam tshuam rau tus nqi thiab qhov zoo ntawm cellulose, uas tau cuam tshuam rau hauv cov dej tuav tus nqi ntawm cov khoom. Cov dej tuav qis qis, thiab lub sijhawm rau cov hmoov tshauv calcium hmoov (calcium oxide hauv cov hmoov tshauv calcium hmoov tsis tag nrho hloov mus rau calcium hydroxide) tsis txaus. ua rau.
Foaming muaj feem xyuam rau cov av qhuav thiab flatness ntawm phab ntsa, thiab nws kuj muaj feem xyuam rau kev tsim kho.
Cov tsos ntawm pinpoints muaj feem xyuam nrog cellulose, uas muaj cov yeeb yaj kiab tsis zoo. Nyob rau tib lub sijhawm, impurities hauv cellulose react me ntsis nrog tshauv calcium. Yog tias cov tshuaj tiv thaiv hnyav, cov hmoov putty yuav tshwm sim hauv lub xeev ntawm taum curd residue. Nws tsis tuaj yeem muab tso rau ntawm phab ntsa, thiab nws tsis muaj lub zog cohesive tib lub sijhawm. Tsis tas li ntawd, qhov xwm txheej no kuj tshwm sim nrog cov khoom xws li carboxymethyl tov nrog cellulose.
Craters thiab pinholes tshwm. Qhov no yog pom tseeb muaj feem xyuam rau cov dej nto nro ntawm hydroxypropyl methylcellulose aqueous kua. Lub rooj dej nro ntawm hydroxyethyl aqueous tov tsis pom tseeb. Nws yuav yog qhov zoo los ua kev kho kom tiav.
Tom qab lub putty dries, nws yog ib qho yooj yim rau tawg thiab tig daj. Qhov no muaj feem xyuam rau qhov sib ntxiv ntawm ntau cov hmoov tshauv-calcium hmoov. Yog tias cov hmoov tshauv-calcium ntxiv ntau dhau lawm, qhov nyuaj ntawm cov hmoov putty yuav nce ntxiv tom qab ziab. Yog tias cov hmoov putty tsis muaj qhov hloov pauv, nws yuav tawg yooj yim, tshwj xeeb tshaj yog thaum nws raug rau sab nraud quab yuam. Nws kuj tseem muaj feem xyuam rau cov ntsiab lus siab ntawm calcium oxide hauv cov hmoov tshauv calcium hmoov.
2. Vim li cas cov hmoov putty ua nyias tom qab ntxiv dej?
Cellulose yog siv los ua thickener thiab dej-retaining tus neeg sawv cev nyob rau hauv lub putty. Vim yog thixotropy ntawm cellulose nws tus kheej, qhov sib ntxiv ntawm cellulose nyob rau hauv cov hmoov putty kuj ua rau thixotropy tom qab ntxiv dej rau lub putty. Qhov no thixotropy yog tshwm sim los ntawm kev puas tsuaj ntawm lub loosely ua ke qauv ntawm cov khoom nyob rau hauv lub putty hmoov. Cov qauv no tshwm sim thaum so thiab so hauv kev ntxhov siab. Uas yog hais tias, lub viscosity txo nyob rau hauv stirring, thiab viscosity rov qab thaum sawv ntsug.
3. Dab tsi yog vim li cas vim li cas lub putty kuj hnyav nyob rau hauv cov txheej txheem scraping?
Hauv qhov no, viscosity ntawm cellulose feem ntau siv yog siab dhau. Qee cov neeg tsim khoom siv 200,000 cellulose los ua putty. Lub putty ua nyob rau hauv txoj kev no muaj viscosity siab, yog li nws xav tias hnyav thaum khawb. Qhov pom zoo ntawm putty rau sab hauv phab ntsa yog 3-5 kg, thiab viscosity yog 80,000-100,000.
4. Vim li cas tib lub viscosity cellulose zoo li txawv nyob rau lub caij ntuj no thiab lub caij ntuj sov?
Vim lub thermal gelation ntawm cov khoom, lub viscosity ntawm putty thiab mortar yuav maj mam txo nrog qhov kub thiab txias. Thaum qhov kub siab tshaj qhov kub ntawm gel ntawm cov khoom, cov khoom yuav raug precipitated los ntawm dej thiab poob nws viscosity. Chav tsev kub nyob rau lub caij ntuj sov yog feem ntau siab dua 30 degrees, uas txawv ntau ntawm qhov kub ntawm lub caij ntuj no, yog li cov viscosity qis dua. Nws raug nquahu kom xaiv cov khoom uas muaj viscosity siab dua thaum siv cov khoom nyob rau lub caij ntuj sov, los yog ua kom cov cellulose nce ntxiv, thiab xaiv cov khoom uas muaj gel kub dua. Sim tsis txhob siv methyl cellulose thaum lub caij ntuj sov. Cov gel kub nyob nruab nrab ntawm ib ncig ntawm 55 degrees, yog tias qhov kub thiab txias me ntsis, nws cov viscosity yuav cuam tshuam zoo heev.
Post lub sij hawm: May-04-2023