Kev siv cov txheej hauv cov khoom ntim khoom kom zoo nkauj

Hauv cov txheej txheem ntim khoom, txheej txheej belongs rau cov khoom siv tom qab ua tiav. Cov khoom no tuaj yeem coated rau ntawm qhov chaw ntawm cov khoom los ntawm kev tsim kho sib txawv los tsim cov yeeb yaj kiab uas muaj zog adhesion, qee lub zog, thiab lub xeev ruaj khov. Cov zaj duab xis yog li tsim feem ntau hu ua zaj duab xis txheej, tseem hu ua xim zaj duab xis lossis txheej.

Lub npe:pleev xim

Hom:Tshuaj pleev ib ce

1. Txoj Cai

Cohesion thiab Cohesion ntawm Coatings

Cohesion yog ib qho "sab hauv" quab yuam, thiab kev sib koom ua ke yog lub zog "sab nraud". Cov ntaub ntawv uas tsis tshua muaj polarity thiab siab cohesion (xws li polyethylene) muaj cov khoom siv zoo, tab sis tsis zoo adhesion; cov ntaub ntawv uas tsis tshua muaj cohesion (xws li cov nplaum) muaj cov yeeb yaj kiab tsis tshua muaj zog thiab tsis zoo ntawm zaj duab xis thiab tuaj yeem ua raws li cov matrix.

2. Muaj nuj nqi

Ntau yam ntaub ntawv uas tuaj yeem siv los pleev xim rau saum npoo ntawm cov khoom thiab tuaj yeem tsim cov yeeb yaj kiab tiv thaiv tawv yog sib sau ua ke hu ua coatings.

3. Kev sib xyaw

Zaj duab xis-tsim cov khoom: Nws yog tsim los ntawm cov resin, thiab kuj muaj qee yam uas tsis yog-volatile active diluents. Nws yog cov khoom tseem ceeb uas ua rau cov txheej txheem ruaj khov rau saum npoo ntawm cov khoom coated los ua ib zaj duab xis tas li. Nws yog lub hauv paus ntawm txheej txheej thiab txiav txim siab cov yam ntxwv ntawm cov txheej txheem.

Resin Definition: Ib txoj hlua ntev polymer synthesized los ntawm cov monomers tshwj xeeb los xyuas kom meej cov khoom ntawm cov xim zaj duab xis.

Lub hom phiaj:Lub ntsiab tseem ceeb ntawm cov txheej txheem txheej txheej, nws muaj kev ua haujlwm ntawm kev sib txuas ntawm lwm cov khoom hauv cov txheej txheem thiab tsim cov xim zaj duab xis, kom cov xim zaj duab xis muaj ntau yam teebmeem ntawm lub cev thiab tshuaj lom neeg.

Muaj peev xwm muaj peev xwm:gloss, adhesion, hardness, pob zeb nti tsis kam, yooj, huab cua tsis kam, hnyav tsis kam, tshuaj tsis kam, thiab lwm yam.

Pigment Txhais: Ib qho inorganic lossis organic insoluble hmoov zoo nrog cov xim xim.

Lub hom phiaj:Lub infinity ntawm pigments tsim cov infinity ntawm ntau yam xim, uas ua rau cov xim muaj infinite xim; nws muaj peev xwm los npog qhov chaw ntawm cov khoom; nws muab kev tiv thaiv corrosion, kev tiv thaiv thiab kev ua haujlwm tshwj xeeb.

Txhais cov kuab tshuaj: Cov kuab tshuaj feem ntau xa mus rau cov kua sib tov ntawm qhov kub thiab txias, uas tuaj yeem yaj lwm yam tshuaj yam tsis muaj tshuaj tiv thaiv.

Muaj nuj nqi:Cov kuab tshuaj muaj peev xwm dilute lub txheej rau lub viscosity uas yuav tsum tau rau tsim thiab tsim. Kev xaiv cov kuab tshuaj yog los txhim kho kev tsim kho thiab cov yeeb yaj kiab ntub dej ntawm cov txheej txheem, uas tshwj xeeb cuam tshuam rau: sag, leveling, huab cua npuas, zaj duab xis tsos, thiab kev siv.

Cov ntsiab lus ntawm additives: additives yog cov khoom uas tau ntxiv rau hauv me me thiab siv los hloov cov yam ntxwv ntawm cov txheej txheem.

Lub hom phiaj:Cov pab cuam uas ua lub luag haujlwm hauv kev tsim cov coatings: wetting thiab dispersing agents; additives uas plays lub luag hauj lwm nyob rau hauv cia: hmoov av-pov thawj, anti-skinning thiab mildew-proof agents, thiab lwm yam .; additives uas plays lub luag hauj lwm nyob rau hauv kev tsim kho thiab ziab: leveling thiab anti-cratering agents, Anti-foaming anti-foaming tus neeg saib xyuas, anti-sagging tus neeg saib xyuas, adhesion promoter, curing promoter, thiab lwm yam.; Cov pab cuam uas ua lub luag haujlwm hauv kev ua yeeb yaj kiab txheej: lub teeb stabilizer, ultraviolet absorber, nplua tus neeg sawv cev, tus neeg sawv cev matting, thiab lwm yam.

Zaj duab xis-tsim thiab pleev xim zaj duab xis zog

1. Cov yeeb yaj kiab-tsim cov khoom hauv txheej txheej yuav tsum muaj cov yeeb yaj kiab-tsim lub zog thiab zoo adhesion. Kev ua yeeb yaj kiab ntau zog tuaj yeem muab kev tiv thaiv rau lub substrate; Thaum cov kuab tshuaj thiab dej evaporate, zaj duab xis yuav inevitably shrinkage, thiab cov polymer kuj yuav shrink thaum nws yog solidified. Lub shrinkage yuav inevitably ua rau nruj nreem, rhuav tshem daim ntawv cog lus, thiab ua rau cov zaj duab xis tev tawm ntawm lub substrate. Tab sis nrog muaj zog adhesion, nws tuaj yeem sib npaug nrog shrinkage.

Cov iav hloov pauv kub: Kev hloov pauv ntawm amorphous lossis semi-crystalline polymer los ntawm lub xeev cov kua nplaum los yog lub xeev muaj zog heev (lub xeev roj hmab) mus rau lub xeev iav (los yog kev hloov pauv) yog hu ua iav hloov. Qhov kwv yees nruab nrab ntawm qhov ntsuas qhov nqaim uas qhov hloov pauv iav tshwm sim yog hu ua iav hloov pauv kub. Tshaj qhov ntsuas kub no, cov polymer nthuav tawm elasticity; Hauv qab no qhov kub thiab txias, lub polymer nthuav tawm brittleness.

2. Mechanism ntawm kev tsim zaj duab xis

Cov txheej yog cov dej ntws thaum xub thawj, thiab nws tsim cov yeeb yaj kiab nyias tom qab txheej txheej tiav, yog li cov iav hloov pauv kub ntawm cov txheej txheem tsim cov yeeb yaj kiab tau nce ntxiv. Cov txheej txheem tseem ceeb ntawm kev tsim cov yeeb yaj kiab yog raws li hauv qab no:

1) Solvent volatilization thiab kub yaj zaj duab xis txoj kev

Cov khoom siv polymer siv hauv txheej txheej muaj qhov hloov pauv ntawm iav siab. Txhawm rau ua kom lawv sib piv, cov kuab tshuaj txaus yuav tsum tau siv los txo cov iav kev hloov pauv kub ntawm lub cev, kom tus nqi ntawm TT0 loj txaus los pab kom cov kua dej ntws thiab lub tsho loj. Tom qab txheej txheej, cov kuab tshuaj evaporates thiab cov khoom siv zaj duab xis yog tsim, uas yog zaj duab xis-forming daim ntawv ntawm cov yas coatings. Lub volatility ntawm cov kuab tshuaj yuav tsum tsis txhob ceev heev. Kev nrawm dhau yuav ua rau cov xim tsis sib xws, ua kom tawv nqaij ntawm cov xim pleev xim, thiab txo lub zog ntawm cov xim zaj duab xis. Cov kuab tshuaj sib txawv kuj tseem cuam tshuam rau morphology ntawm polymer molecules hauv cov xim zaj duab xis.

Tus nqi ntawm (T-Tg) kuj tuaj yeem nce qhov kub thiab txias, piv txwv li, cua sov melts lub polymer mus rau qhov tseem ceeb. Tom qab cov dej ntws polymer tsim ib zaj duab xis ntawm qhov chaw ntawm lub substrate thiab txias, cov xim pleev xim tuaj yeem muab tau. Qhov no yog lwm hom yas txheej zaj duab xis tsim, uas yog hu ua kub yaj zaj duab xis tsim.

2) Tshuaj lom neeg txoj kev tsim

Kev tsim cov yeeb yaj kiab tshuaj yog hais txog thawj txheej txheej ntawm soluble (lossis fusible) polymers nrog qhov hnyav molecular rau ntawm qhov chaw ntawm lub substrate, thiab nyob rau hauv cov cua sov los yog lwm yam kev mob, intermolecular cov tshuaj tiv thaiv tshwm sim los ntxiv qhov hnyav molecular los yog cov txheej txheem ntawm kev sib txuas. mus rau hauv ib zaj duab xis tawv tshwm sim.

3) Zaj duab xis tsim ntawm latex

Latex thiab Emulsion: Latex yog cov khoom sib cais nyob rau hauv cov theem txuas ntxiv ntawm dej, emulsion yog kua dispersed hauv dej. Latexes feem ntau yog npaj los ntawm emulsion polymerization, thiab lawv cov viscosity yog ywj siab ntawm qhov hnyav molecular ntawm cov polymer. Tom qab cov latex qhuav, ib zaj duab xis tuaj yeem tau, thiab cov hmoov kuj tuaj yeem tau. Latex muaj ntau yam hauv cov txheej txheem thiab lwm yam kev siv, thiab feem ntau yuav tsum tau latex los ua ib zaj duab xis.

4) xim zaj duab xis kev ua haujlwm

Xim, zoo li (leveling, fullness / DOI tus nqi), gloss, hardness, adhesion, pob zeb nti kuj, huab cua tsis kam, tshuaj tiv thaiv, UV tsis kam, ntsev tsuag dej kub, hnyav roj kuj.

3. Kev ntsuam xyuas cov txheej txheem

1. Cov txheej txheem ua kua: viscosity, cov ntsiab lus khoom, ntom, tsis kam, flash point

2. Xim zaj duab xis tom qab tsim zaj duab xis: xim, zoo li tus nqi DOI, gloss, zais lub zog, hardness, adhesion, pob zeb nti tsis kam, huab cua tsis kam, av noo thiab tshav kub ntsev tsuag, hnyav tsis kam, tshuaj tiv thaiv, thiab lwm yam.

3. Kev ntsuas ntsuas: viscosity khob, cupping test instrument, colorimeter, ntsev tsuag tshuab, xenon teeb aging tshuab, QUV laus tshuab, roj chromatograph, conductivity meter, tag nrho cov kua qaub thiab tag nrho alkali PH kev txiav txim, ntim ntim, tsis kam kuaj, gloss kuaj.