Kev siv hydroxyethyl cellulose hauv cov xim latex yog raws li hauv qab no: 1. Ntxiv ncaj qha thaum sib tsoo xim: hom no yooj yim, thiab lub sijhawm siv luv luv.Cov kauj ruam ntxaws ntxaws yog raws li hauv qab no: (1) ntxiv cov dej huv kom zoo (feem ntau, ethylene glycol, tus neeg sawv cev ntub dej thiab tus neeg ua yeeb yaj kiab tau ntxiv rau lub sijhawm no) (2) pib nplawm ntawm qhov ceev tsis tu ncua thiab maj mam ntxiv hydroxyethyl cellulose (3) txuas ntxiv stirring kom txog thaum tag nrho cov khoom ntub dej (4) ntxiv mildew inhibitor;PH regulator, thiab lwm yam. (5) do kom txog thaum tag nrho cov hydroxyethyl cellulose yaj tag (kev daws viscosity nce) ua ntej ntxiv lwm yam ntawm cov mis, sib tsoo kom txog thaum xim.
2.Txuas nrog niam cawv tos kev siv: txoj kev no yog thawj zaug nruab nrog ntau dua ntawm niam cawv, thiab tom qab ntawd ntxiv rau cov xim latex, txoj kev no muaj qhov zoo ntawm kev yooj yim dua, tuaj yeem ncaj qha ntxiv rau cov khoom pleev xim, tab sis yuav tsum yog khaws cia kom raug.Cov kauj ruam thiab cov txheej txheem zoo ib yam li cov kauj ruam (1)-(4) hauv txoj kev 1, tshwj tsis yog tias lub siab shear agitator tsis tas yuav tsum tau, thiab tsuas yog lub agitator uas muaj hwj chim txaus los ua kom cov hydroxyethyl fibers tsis sib haum xeeb hauv cov tshuaj.Ntxiv stirring kom txog thaum nws dissolves tag nrho rau hauv ib tug viscous tov.Yuav tsum nco ntsoov tias: mildew inhibitor yuav tsum muab ntxiv rau niam cawv kom sai li sai tau.3. Congee nrog cov phenology: raws li cov organic solvents rau hydroxyethyl cellulose yog cov kuab tshuaj phem, yog li cov organic solvents yuav siv tau los npaj congee.Feem ntau siv cov kuab tshuaj organic xws li ethylene glycol, propylene glycol, thiab cov neeg ua yeeb yaj kiab (xws li hexanediol lossis diethylene glycol butyl acetate), dej khov kuj yog cov kuab tshuaj tsis zoo, yog li nws feem ntau siv nrog cov organic kua los npaj porridge.Porridge zoo li hydroxyethyl cellulose tuaj yeem ntxiv ncaj qha rau cov xim.Hydroxyethyl cellulose tau tag nrho inflated nyob rau hauv lub porridge.Thaum lacquer ntxiv, nws dissolves tam sim ntawd thiab thickens.Tom qab ntxiv, nws yuav tsum tau nplawm tsis tu ncua kom txog thaum hydroxyethyl cellulose yog yaj tag thiab zoo ib yam.Feem ntau porridge yog nrog rau rau feem ntawm cov organic hnyav lossis dej khov thiab ib feem ntawm hydroxyethyl cellulose sib tov, li 5-30 feeb tom qab, hydroxyethyl cellulose yuav hydrolyzed thiab o.Lub caij ntuj sov thaum cov dej noo dav dav heev, tsis haum rau nruab nrog porridge.
3. Plaub.Nco ntsoov thaum npaj niam cawv ntawm hydroxyethyl cellulose txij li hydroxyethyl cellulose yog cov tshuaj kho hmoov, nws yooj yim rau kev khiav lag luam thiab yaj hauv dej los ntawm kev xyuam xim rau cov hauv qab no.1 ua ntej thiab tom qab ntxiv hydroxyethyl cellulose, qhov sib tov yuav tsum tau nplawm tas li kom txog thaum cov tshuaj yog pob tshab thiab meej.2 yuav tsum tau sifted rau hauv lub nruas sib tov, tsis txhob muaj ntau cov pob los yog cov pob ntawm hydroxyethyl cellulose tau ntxiv ncaj qha rau hauv lub nruas sib tov.3 lub solubility ntawm hydroxyethyl cellulose muaj feem xyuam rau dej kub thiab pH nqi hauv dej, uas yuav tsum tau them tshwj xeeb mloog mus rau.4 tsis txhob ntxiv qee yam tshuaj rau qhov sib xyaw ua ntej hydroxyethyl cellulose hmoov yog saturated nrog dej.Ua kom pH tom qab soaking pab kom yaj.5 kom deb li deb tau, ntxov kom ntxiv cov tshuaj tiv thaiv kab mob.6 thaum siv high viscosity hydroxyethyl cellulose, leej niam cawv concentration tsis tuaj yeem siab dua 2.5-3% (gravimeter), txwv tsis pub leej niam cawv ua haujlwm nyuaj.Cov yam ntxwv cuam tshuam rau viscosity ntawm latex xim:
1 Cov ntsiab lus ntawm huab cua npuas hauv cov xim ntau dua, qhov viscosity siab dua.2 tus nqi ntawm cov activator nto thiab dej siv hauv cov xim pleev xim yog tsim nyog.3 nyob rau hauv lub synthesis ntawm latex, tus nqi ntawm residual catalysts thiab lwm yam oxides.4 tus nqi ntawm lwm yam ntuj thickeners nyob rau hauv cov xim xim thiab qhov kev faib ua feem nrog hydroxyethyl cellulose.5 nyob rau hauv tus txheej txheem ntawm cov xim, ntxiv thickener kauj ruam ib theem zuj zus yog tsim nyog.6 vim muaj kev ntxhov siab ntau heev kom thaum dispersed noo noo overheating.7 microbial corrosion ntawm Thickener.
Post lub sij hawm: Oct-24-2023