Tiav xws li polyester varnishes feem ntau siv hauv cov rooj tog zaum thiab kev lag luam. Cov kab khoom muaj xws li glossy thiab matt finishes haum rau txheej hlau thiab ntoo substrates. Ntxiv nrog rau cov txheej txheej, polyester primers tau muag muag ntawm lub khw, uas yog qhov tseem ceeb rau kev kaw qhov pore tiav.
Khoom ntawm polyester-raws li txheej
Cov nyiaj no yog qhov ua tau zoo dua. Ib yam khoom uas muaj xws li cov kua roj vanish zoo li ci dua nyob rau hauv tsos, thiab qhov chaw tau txais ib ci ntsa iab zoo li cov nyhuv ntub dej. Nrog rau kev xaiv ntawm kev siv cov kua roj vanish, qhov saum npoo tau txais cov khoom zoo nkauj zoo nkauj.
Los ntawm kev sib xyaw ua ke, cov khoom sib xyaw polyester yog paraffin-muaj thiab tsis muaj paraffin, txhua qhov sib txawv hauv nws cov ntsiab lus tshwj xeeb ntawm kev ua haujlwm.
Ib qho tshwj xeeb ntawm polyester varnishes nyob hauv lawv cov khoom, uas yog:
- haum zoo ntawm lub hauv paus ntoo;
- tiv nrog me me imperfections: mechanical defects, chips los yog dents, grooves tshwm sim los ntawmsib tsoo;
- tsim cov txheej txheem sib luag thiab du glossy, uas, yog tias tsim nyog, yog sanded tom qab ziab kom tshem tawm cov txheej txheem paraffin saum toj kawg nkaus.
Ntawm thiab cov txiaj ntsig ntawm kev siv cov txheej polyester
Ntawm cov yam ntxwv tshwj xeeb ntawm polyester compound rau ntoo:
- muaj peev xwm siv lub tsho sab saum toj ua lub hauv paus (lub tsho npaj);
- khoom zoo nkauj zoo nkauj (glossy nto);
- tshwj xeeb matte kev ntxhib los mos, kom ua tiav cov khoom siv tshwj xeeb, ntxiv rau cov kua roj vanish polyester;
- muaj peev xwm ntawm pigmenting cov kua roj vanish kom ua tiav lub suab zoo nkauj ntawm txheej;
- varnish shrinkage tsis tshwm sim dhau sijhawm;
- rau kev ua haujlwm sab nraud tsis yog qhov kev xaiv zoo heev, vim nws tsis ruaj khov rau kev hloov pauv hauv huab cua.
Txoj kev ntawm cov tshuaj paraffin-muaj cov qauv
Polyester varnishes rau ntoo, cov khoom muaj pes tsawg leeg uas suav nrog unsaturated resins yaj hauv styrene. Tsis tas li ntawd, nws muaj cov catalysts (initiators) thiab accelerators (accelerators) ntawm cov txheej txheem polymerization. Vim cov ntsiab lus ntawm paraffin nyob rau saum npoo ntawm cov khoom, ib zaj duab xis nyias yog tsim los tiv thaiv cov evaporation ntawm styrene thiab oxidation ntawm lub puab txheej ntawm cov kua roj vanish. Qhov no yog qhov ua rau nws ua tau kom ua tiav cov txheej txheem ua yeeb yaj kiab uas txawv ntawm nws lub zog.
Txoj kev siv cov kua roj vanish ntoo yog los ntawm kev nchuav thiab txau. Dries ua tiavnto ntawm qhov tsawg kawg yog 180 feeb ntawm qhov kub ntawm +20 oC (±2 o C).
% ntawm cov seem qhuav ntawm paraffin-muaj polyester muaj pes tsawg leeg - txog 94.95%. Qhov no yog ib qho cuab yeej uas tso cai rau txo qis kev siv cov khoom siv pleev xim rau txheej txheej ntawm cov rooj tog zaum ntawm kev lag luam.
Txheej txheem ntawm cov kua roj vanished
Alkyd resins nyob rau hauv muaj pes tsawg leeg ua kom cov nplaum nplaum ntawm qhov chaw. Qhov ntsuas qhov seem qhuav ntawm cov kua roj vanish yog qis dua, tab sis cov ciam teb ntawm qhov kub thiab txias cia cov khoom siv dav dua li cov kua roj vanish.
Txhawm rau siv rau saum npoo ntawm cov khoom ntoo, siv txoj kev nchuav los yog lub tshuab pneumatic tshwj xeeb hauv qhov hluav taws xob hluav taws xob ntawm cov hluav taws xob hluav taws xob siab. Thaum siv cov txheej txheem tom kawg, nws muaj peev xwm txuag tau qhov kev noj ntawm polyester muaj pes tsawg leeg.
Cov yam ntxwv tseem ceeb ntawm polyester kua roj vanish rau hlau
Hlau, cov khoom siv los ntawm lub zog thiab kev ntseeg siab, tab sis zoo li txhua yam uas nyob ib puag ncig peb, sai lossis tom qab nws poob nws cov yam ntxwv, ua tsis tau. Nws yog ib qho tsim nyog sau cia tias cov qauv sab nraum zoov poob rau hauv kev puas tsuaj sai dua li lwm tus.
Nrog rau qhov tsis tu ncua ntawm cov hlau nto rau hnub ci, nag lossis daus, kub hloov thiab lwm yam kev nyab xeeb thiab kev cuam tshuam ntawm ib puag ncig, xeb tshwm sim ntawm cov hlau nto, uas qhia tau tias tsis muaj kev cuam tshuam - corrosion.
Tiv thaiv hlau puag los ntawm txoj hmoo zoo li no, sivcov kua roj vanish tshwj xeeb thiab cov xim, nrog rau cov kua roj vanish polyester rau hlau. Cov txheej txheem zoo li no ua rau muaj qhov tshwj xeeb tiv thaiv zoo nkauj txheej ntawm cov khoom.
Ntau cov txheej txheem yog siv los siv cov txheej txheem hlau:
- nrog txhuam;
- thov ib tug menyuam;
- thaum siv rab phom;
- thov ib lub kaus.
Tau kawg, ob txoj kev xaiv kawg yog qhov zoo dua vim qhov tseeb tias cov kua roj vanish nteg tusyees thiab noj qeeb dua, sib sib zog nqus tob rau hauv cov qauv ntawm txheej txheej ntawm cov khoom thiab tsim cov txheej txheem tiv thaiv kev ntseeg tau.
Nws yog ib qho tsim nyog sau cia tias ntawm cov khoom ntawm polyester cov kua roj vanish yog cov dej muaj zog uas tiv thaiv qhov chaw ntawm cov hlau thiab ntoo los ntawm corrosion thiab lwj, feem.
Tam sim no koj nkag siab tias polyester muaj pes tsawg leeg yog dab tsi thiab vim li cas nws thiaj li xav tau. Cov yam ntxwv saum toj no ntawm qee hom polyester-raws li txheej txheej yuav pab koj tsom mus rau kev xaiv qhov kev xaiv, nqaim ntau yam ntawm cov khoom raws li qhov xav tau.
