I. Cov teeb meem tshwm sim thaum thov
1. Sagging (Paint Running): Xim sau downwards tom qab siv rau ib tug ntsug nto, tsim ib tug tsis sib xws xim zaj duab xis.
Cov laj thawj tseem ceeb: Txau tuab heev, txau ze heev (<15cm), low ambient temperature leading to slow drying, paint that is too thin.
Kev daws: Siv ib txoj kev "nyias tsuag, ntau txheej", nrog 3-10 feeb ntawm txhua txheej; tswj qhov kev ncua deb ntawm 20-30cm ntawm cov tshuaj tsuag nozzle thiab qhov chaw; tswj lub ambient kub ntawm 15-25℃thiab av noo ntawm 40% -70%.
2. Cov nyhuv ntawm txiv kab ntxwv Peel (Cov xim tsis sib xws): Tom qab cov xim zaj duab xis dries, qhov saum npoo muaj cov xim zoo ib yam li txiv kab ntxwv tev.
Ua rau: Tsis siv tshuaj txau siab, xim tsis sib xws atomization, kub ambient kub ua rau kom qhuav sai.
Cov kev daws teeb meem: Kho cov tshuaj tsuag cua kom paub meej txaus xim atomization; zam kev siv nyob rau hauv siab - kub lossis muaj zog - cua ib puag ncig.
3. Undercoat Bleeding (Topcoat Softens Undercoat): Topcoat solvents nkag mus rau hauv substrate, ua rau cov primer wrinkle los yog tev.
Ua rau: Siv lub tsho tiv no tom ntej ua ntej cov primer qhuav tag, los yog tsis sib xws primer thiab topcoat.
Kev Tiv Thaiv: Xyuas kom cov primer qhuav tag ua ntej siv lub tsho tiv no tom ntej; xaiv cov xim sib xws.
4. Particle Formation (Rough Paint Film Surface): Fine particles tshwm tom qab cov xim zaj duab xis dries.
Ua rau: Plua plav ua haujlwm ib puag ncig, txhaws cov tshuaj tsuag nozzles, cov xim tsis zoo lossis cov xim tsis zoo.
Kev Kho: Ntxuav ib puag ncig thiab cov cuab yeej ua ntej thov; lim cov xim ua ntej txau; tsis tu ncua ntxuav cov tshuaj tsuag nozzle nrog thinner.
5. Adhesion tsis zoo (Cov xim zaj duab xis Peeling): Cov xim txheej tsis khi ruaj khov rau cov substrate, yooj yim ua rau blistering thiab tev.
Yam Tseem Ceeb: Kev npaj tsis txaus (piv txwv li, tsis muaj xuab zeb, roj stains), steel tsis ua raws li Sa2.5 cov qauv tshem tawm xeb, tsis zoo txheej txheej.
Kev Txhim Kho Kev Ntsuas: Ua kom huv si thiab xuab zeb lub substrate kom muaj kev ntxhib los mos Rz ntawm 30-80μm; siv lub sealant tshwj xeeb los txhim kho interlayer adhesion.
II. Cov teeb meem tshwm sim thaum khaws cia thiab siv
1. Skinning (Forming ib Hardened Paint Skin): Yog hais tias cov xim tsis zoo kaw tom qab qhib, cov kua nto oxidizes thaum sib cuag nrog huab cua, tsim ib tug tawv tawv.
Ua rau: Unsealed thawv, siab heev cia kub, ntau dhau drier.
Kev daws: Tam sim nruj lub hau tom qab siv; rau luv luv- lub sij hawm cia, ncuav cov xim rau hauv ib lub raj mis me me thiab khaws cia rau pem hauv ntej kom txo tau qhov cua.
2. Sedimentation thiab clumping (Pigment Settling): Tom qab lub sijhawm ntev, cov xim nyob hauv, thiab nyob rau hauv cov xwm txheej hnyav, nws tsim cov pob tawv tawv uas nyuaj rau do kom sib npaug.
Causes: Excessive storage time, excessively high temperature (>28 degree), ntau nyias nyias, los yog tsis txaus sib tsoo.
Kev Kho Mob: Co lossis tig lub thawv xim tsis tu ncua; rau me ntsis sedimentation, do kom huv si nrog ib tug ntoo stick; cov pob tawv tawv yuav tsum tau lim ua ntej siv.
3. Txheej (Kev sib cais ntawm cov kua dej los ntawm dej-Raws li xim): Dej- cov xim pleev xim rau pom cov txheej sab saud thiab cov txheej tuab tuab tom qab khaws cia.
Ua rau: xaiv cov thickener tsis tsim nyog, pH tsis txaus, los yog qis qis cia kub ua rau demulsification.
Kev daws: Kho qhov feem ntawm HEUR / HASE hom thickeners hauv cov mis; zam qhov qis- qhov kub thiab txias cia thiab tuav ib puag ncig ruaj khov.
4. Thickening lossis Gelming: Cov xim viscosity nce txawv txav, txawm tias tsis siv tau.
Inducing Factors: Cov dej nkag mus rau hauv lub thawv, cov kua qaub ntau dhau los ua rau cov xim, lossis qhov hloov pauv loj hauv qhov kub thiab txias.
Kev Kho Mob: Ntxiv qhov tsim nyog ntawm qhov sib txuam thinner los kho cov viscosity, tab sis txiav siv yog tias hnyav heev.
5. Kev qhib nyuaj: Lub foob yog nruj dhau los yog muaj qhov tsis zoo, ua rau nws nyuaj rau qhib.
Tswv yim: qhwv lub hau nrog ib daim ntaub kom muaj kev sib txhuam thiab maj mam kais ntawm ntug ntawm lub hau kom loosen lub foob; siv lub taub hau ntsia hlau los rub tusyees raws seam, saib xyuas kom tiv thaiv cov roj hmab gasket.
