Tej teeb meem ntawm dej-resistant putty rau sab hauv phab ntsa

1. Cov teeb meem tshwm sim hauv cov hmoov putty:

1.1 Dries sai. Qhov no feem ntau cuam tshuam nrog kev sib ntxiv ntawm cov tshauv calcium thiab cov dej tuav tus nqi ntawm cov fiber ntau, thiab tseem muaj feem cuam tshuam rau qhov dryness ntawm phab ntsa.

1.2 Peeling thiab dov. Qhov no 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 me me.

1.3 De-powder. Qhov no muaj feem xyuam rau tus nqi ntawm cov hmoov tshauv calcium ntxiv, thiab nws kuj muaj feem xyuam rau cov nqi thiab qhov zoo ntawm cellulose ntxiv. Nws yog reflected nyob rau hauv cov dej tuav tus nqi ntawm cov khoom. Cov dej tuav tus nqi tsawg thiab lub sij hawm hydration ntawm tshauv calcium tsis txaus.

1.4 Kev kub ntxhov. Qhov no muaj feem xyuam rau cov av qhuav thiab flatness ntawm phab ntsa, thiab nws kuj muaj feem xyuam rau kev tsim kho.

1.5 Ib tus pin point tshwm. Qhov no muaj feem xyuam rau cellulose, uas muaj cov yeeb yaj kiab tsis zoo. Nyob rau tib lub sijhawm, cov 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 carboxyl pawg ntxiv rau cov cellulose.

1.6 Volcanoes 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.

1.7 Tom qab cov putty qhuav, nws yooj yim tawg thiab tig daj. Qhov no muaj feem xyuam rau qhov sib ntxiv ntawm ib qho loj ntawm grey calcium. Yog tias cov nyiaj grey calcium ntxiv ntau dhau lawm, qhov nyuaj ntawm cov hmoov putty yuav nce ntxiv tom qab ziab. Tsuas yog lub hardness thiab tsis yooj yim 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 grey calcium, uas tau qhia ua ntej.

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. Vim li cas lub putty hnyav 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 lub putty thiab mortar ua los ntawm cellulose nrog tib viscosity zoo li txawv nyob rau lub caij ntuj no thiab lub caij ntuj sov?

Vim lub thermal gelation ntawm cov khoom, lub viscosity ntawm cov khoom yuav maj mam txo nrog qhov nce ntawm 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 lag luam nrog cov viscosity siab dua nyob rau lub caij ntuj sov, lossis ua kom cov cellulose nce ntxiv, thiab xaiv cov khoom uas muaj gel kub dua. Sim xaiv cov khoom uas muaj gel kub siab tshaj 70 degrees. Sim tsis txhob siv methyl cellulose thaum lub caij ntuj sov, nws cov gel kub nyob ib ncig ntawm 55 degrees, yog tias qhov kub thiab txias me ntsis, nws cov viscosity yuav cuam tshuam zoo heev.