Cov tsos zoo ntawm luam ntawv elastic dawb kua nplaum yog sab nraud qhia ntawm nws qhov zoo thiab zoo, uas suav nrog cov tsos ntawm lub xeev, fineness thiab fluidity ntawm luam ntawv elastic dawb kua nplaum. Qhov zoo ntawm cov ntawv luam tawm elastic dawb cov kua nplaum yuav tsum yog cov kua ua kua, cov kua nplaum dawb ib nrab muab tshuaj txhuam, muag muag thiab sib npaug, zoo fluidity, thiab ci ntsa iab. Txawm li cas los xij, tsis zoo luam ntawv elastic dawb kua nplaum feem ntau muaj txheej txheej, tsis muaj dej tsis zoo, flocculation thiab dej sib cais, ntau viscosity, thiab muab tshuaj txhuam zoo li lub cev thaum khaws cia, uas cuam tshuam ncaj qha rau nws qhov zoo, xim, npog lub zog, dej tsis kam, qib, Opacity, gloss, xim tawm los thiab lwm yam khoom.
Muaj ntau yam uas cuam tshuam rau qhov zoo ntawm cov ntawv luam tawm cov nplaum dawb: cov khoom siv raw xws li cov resin (adhesive) wetting thiab dispersing tus neeg sawv cev, thickener, muab tub lim thiab nws cov mis thiab cov txheej txheem ntau lawm yuav cuam tshuam rau nws.
Yog vim li cas cuam tshuam qhov tshwm sim zoo ntawm luam ntawv Elastic Dawb Mucilage
1. Roj yog cov yeeb yaj kiab-txheej txheem ntawm luam ntawv elastic dawb kua nplaum. Thaum lub sij hawm cov tshuaj polymerization cov tshuaj tiv thaiv ntawm resin, kub, lub sij hawm, cov tshuaj tiv thaiv ceev, tshav kub preservation, stirring ceev thiab ntxiv additives yuav ua rau cov tshuaj tsis tiav thiab residual ntau monomers yuav ua rau tsis zoo tshuaj thiab lub cev stability, thiab cov resin kuj coagulate thiab coalesce. , ua rau delamination ntawm luam ntawv elastic dawb kua nplaum, muaj zog tsw, tsis zoo adhesion, network thaiv thiab lwm yam tsis ruaj khov. Yog li ntawd, cov resin yuav tsum muaj cov tshuaj zoo stability, cia stability, zoo elasticity, muaj zog adhesion, softness thiab tsis-stick yam ntxwv.
2. Kev txiav txim siab los ntawm kev tawm suab nrawm (Stokes txoj cai)
V=218r2(P-P1)/η
Hauv cov qauv: V-poob nrawm, ㎝ / s; r-particle radius, ㎝;
P-pigment particle ntom, g / cm3; P1-kua ntom, g / cm3
η-kua particle loj, 0.1pa.s
Lub sedimentation tshaj tawm ntawm cov muab tub lim muaj ntau yam kev sib raug zoo nrog kev sib tsoo fineness, uas yog, qhov ntau dua qhov sib tsoo fineness, sedimentation tshaj tawm ntawm cov muab tub lim yuav multiplied. Kev luam tawm cov kua nplaum dawb yuav cais cov dej thiab flocculate hauv cov khaubncaws sab nraud povtseg hauv lub sijhawm luv luv. Yog li qhov dav dav zoo nyob hauv 15-20μm. Txawm li cas los xij, cov xim zoo nkauj tsuas yog ncua sij hawm thiab tsis tiv thaiv kev daws teeb meem. Kev luam tawm cov kua nplaum dawb yog cov kua nplaum uas tsis yog-Newtonian fluidity, thiab nws cov viscosity yuav tsum tau ntsuas nrog lub viscometer rotational.
3. Kev cuam tshuam ntawm luam ntawv elastic dawb kua nplaum additives
Cov ntub dej thiab dispersing tus neeg sawv cev nyob rau hauv lub luam ntawv elastic dawb mucilage tuaj yeem sib npaug sib faib ntau yam khoom ntim. Lub xov tooj xoob yog nkag mus rau hauv nws cov muaj pes tsawg leeg los ua kom cov khoom ntim cov khoom tshem tawm tsis muaj sedimentation, txo cov viscosity ntawm slurry, thiab tiv thaiv cov luam ntawv elastic dawb mucilage los ntawm flocculating. thiab nag lossis daus txheej; qhov sib ntxiv ntawm qib txo qis kev sib nrig sib tuav ntawm macromolecular chains, txo cov kev sib txhuam ntawm cov khoom thiab txo cov viscosity. Lub thickener plays lub luag haujlwm tseem ceeb hauv kev kho cov tsos zoo ntawm kev luam ntawv elastic dawb kua nplaum.
4. Kev cuam tshuam ntawm kev luam ntawv elastic dawb kua nplaum txheej txheem
Kev nrawm nrawm ntawm cov agitator yuav ua rau cov resin demulsified los ntawm siab shear, thiab qhov tsis raug ntawm cov additives xws li dispersants, flow agents, thiab thickeners kuj yuav ua rau demulsification ntawm luam ntawv elastic dawb kua nplaum thiab tsim cov gel hais. Tswj lub sij hawm, kub thiab cov khoom fineness ntawm cov txheej txheem ntau lawm.
Tshwm Sim Kev Tswj Xyuas Txoj Kev Luam Ntawv Elastic Dawb Glue
1. Xaiv cov resin haum rau cov qauv tsim cov cai
Resin yog qhov tseem ceeb tshaj plaws ntawm kev luam ntawv elastic dawb kua nplaum. Cov resins sib txawv muaj qhov sib txawv ntawm qhov sib txawv me me, tshuaj ion stability, mechanical stability, dej-hauv-roj, roj-hauv-dej thiab hydrophilicity, uas muaj kev cuam tshuam zoo rau cov tsos. Yog li ntawd, thaum xaiv ib tug resin, nws yog tsim nyog los xav txog tag nrho cov yam ntxwv ntawm cov resin nws tus kheej, tshwj xeeb tshaj yog cov compatibility ntawm resin, thiaj li los tswj cov kev xaiv ntawm fillers thiab additives nyob rau hauv cov txheej txheem formula.
2. Ua kom zoo nrog cov dispersant thiab leveling agent
Leveling agents thiab dispersants ua los ntawm cov tuam txhab sib txawv muaj qhov sib txawv HLB qhov tseem ceeb. Feem ntau, dispersants thiab leveling agents (dej-raws li) nrog loj HLB qhov tseem ceeb yuav txo cov viscosity ntawm lub system ntau dua; Nrog rau qhov nce ntawm HLB qhov tseem ceeb, ntau hom dispersing thiab leveling agents yuav txo cov viscosity ntawm lub cev thiab cuam tshuam rau cov resin loj dua. Lub hydrophilic dispersing thiab leveling tus neeg saib xyuas yuav txhim kho kev ruaj ntseg ntawm cov luam ntawv elastic dawb kua nplaum, thiab cov hydrophobic dispersing thiab leveling tus neeg saib xyuas yuav txhim kho cov txhuam tsis kam ntawm cov luam ntawv elastic dawb kua nplaum tom qab tsim zaj duab xis. Yog li ntawd, kev sib xyaw ua ke ntawm hydrophilic thiab hydrophobic dispersing thiab leveling cov neeg ua haujlwm tuaj yeem txhim kho kev cia ntawm luam ntawv elastic dawb kua nplaum. Yog hais tias muaj ntau dispersing thiab leveling tus neeg sawv cev ntxiv, nws hydrophilicity thiab fluidity yuav zoo dua, tab sis nws ceev ceev yuav raug txo thiab nws cov dej kuj yuav deteriorated. Yog tias me ntsis dispersing thiab leveling tus neeg sawv cev ntxiv, nws yuav cuam tshuam ncaj qha rau qhov zoo ntawm nws cov tsos, yog li feem ntau nws yuav tsum tau tswj ntawm 3% -5%.
3. Tsim nyog xaiv cov thickeners los txhim kho kev ua tau zoo ntawm kev luam ntawv elastic dawb kua nplaum
Tam sim no, cov thickeners feem ntau siv los luam cov nplaum dawb muaj xws li: polyacrylic acid, cellulose ether, alkali-soluble acrylic, thiab non-ionic associative polyurethane.
Cellulosic thickeners (tsuas yog suav nrog hydroxypropyl methyl cellulose, hydroxyethyl cellulose, thiab hydroxypropyl cellulose) muaj cov thickening efficiency thiab zoo stability, tab sis tsis zoo leveling thiab yooj yim ua rau lub web marks nyob rau hauv kev tshuaj ntsuam luam ntawv, thiab muaj ib tug tej yam nyhuv ntawm lub gloss ntawm slurry. Polyurethane thickeners yog kim dua thiab tsis tshua muaj siv hauv kev luam ntawv elastic dawb kua nplaum. Polyacrylic acid thickeners muaj cov yam ntxwv zoo, tsis yooj yim los tsim cov cim network, tsis cuam tshuam rau lub gloss ntawm slurry, muaj dej tsis kam thiab lom neeg ruaj khov, thiab muaj kev sib raug zoo, yog li cov kev sib txuas molecular yog tsim los ntawm cov khoom, ua rau Resin. -filler-resin tsim ib lub network qauv, muab siab nruab nrab thiab siab shear speeds, ua rau cov luam ntawv elastic dawb kua nplaum muaj zoo rheology, thiab ua rau cov tsos ntawm milky dawb kua semi-paste.
4. Siv cov txheej txheem tsim khoom kom raug
Lub thickener yuav tsum tau diluted nrog dej ua ntej ntxiv. Cov resin yuav tsum tau ntxiv ua ntej, thiab cov agitator yuav tsum tau khaws cia ntawm qhov nruab nrab-tsawg ceev kom tsis txhob resin demulsification tshwm sim los ntawm ntau shearing. Thaum lub sij hawm tsim khoom, lub viscosity ntawm slurry yuav tsum tau soj ntsuam txhua lub sij hawm, thiab lub stirring ceev thiab kub ntawm lub slurry thaum lub sij hawm tsim khoom yuav tsum tau zoo tswj. Thiab ua ntej kho cov slurry, ntxiv qhov tsim nyog tus nqi ntawm surfactant los tiv thaiv cov resin hais los ntawm demulsification.
Post lub sij hawm: Mar-04-2023