HPMC siv rau phab ntsa putty hmoov

1. Cov teeb meem tshwm sim hauv cov hmoov putty

Dries sai:

Qhov laj thawj tseem ceeb yog tias cov hmoov tshauv calcium ntxiv (loj dhau lawm, cov hmoov tshauv calcium hmoov siv hauv cov mis putty tuaj yeem txo kom tsim nyog) muaj feem xyuam rau cov dej tuav ntawm cov fiber ntau, thiab tseem muaj feem cuam tshuam rau cov dryness. ntawm phab ntsa.

Peeling thiab dov:

Nws muaj feem xyuam rau cov dej tuav tus nqi, thiab qhov tsawg viscosity ntawm cellulose yog nquag rau qhov teeb meem no los yog tus nqi ntawm ntxiv yog me me.

De-powder ntawm sab hauv phab ntsa putty hmoov:

Tus nqi ntawm cov hmoov tshauv calcium ntxiv (cov hmoov tshauv calcium hmoov nyob rau hauv cov mis putty tsawg dhau los yog cov purity ntawm cov hmoov tshauv calcium hmoov tsawg dhau, thiab cov hmoov tshauv calcium hmoov nyob rau hauv cov hmoov putty hmoov yuav tsum tau nce kom tsim nyog) , thiab nws kuj tseem muaj feem xyuam rau tus nqi ntawm cellulose thiab Qhov zoo yog muaj feem xyuam nrog, uas yog reflected nyob rau hauv cov dej tuav tus nqi ntawm cov khoom. Cov dej tuav tus nqi qis, thiab cov hmoov tshauv calcium hmoov (cov calcium oxide hauv cov hmoov tshauv calcium hmoov tsis tag nrho hloov mus rau calcium hydroxide rau hydration) tsis txaus sijhawm, uas yog tshwm sim.

Ua npuas ncauj:

Cov av noo ntawm phab ntsa yog cuam tshuam nrog kev ua kom tiaj tus, thiab nws tseem cuam tshuam nrog kev tsim kho.

Ib tug pinpoint tshwm:

Nws muaj feem xyuam nrog cellulose, nws cov cuab yeej ua yeeb yaj kiab tsis zoo, thiab tib lub sijhawm, cov impurities hauv cellulose hnov ​​​​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.

Tom qab lub putty dries, nws yog ib qho yooj yim rau tawg thiab tig daj:

Nws 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 tau yooj yim, nws yuav yooj yim tawg, 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 cov thickener thiab dej-retaining tus neeg sawv cev ntawm putty. Vim lub thixotropy ntawm cellulose nws tus kheej, qhov sib ntxiv ntawm cellulose nyob rau hauv putty hmoov 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 bonded qauv ntawm 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 tau pom zoo tias thaum lub caij ntuj sov, sim xaiv cov khoom uas muaj viscosity siab dua thaum siv cov khoom, lossis ua kom cov cellulose nce ntxiv.