Zastitna boja

[Barba]

Zar u tu svrhu nije bolje i skuplje koristiti epoksi smolu nego epoksi prajmer?

[BOKAC]

Nakon peskarenja se tu i tamo otvori poneka rupica, pa treba racunati nakon varenja opet mazanje. Takodje nisu racunata ojacanja koja na prvi pogled deluju kao mala povrsina ali ih ima pun k...c. U svakom slucaju i bez svega ovoga treba kupiti 18-19 kg epoksija i ta kolicina se ne isplati kupovati u kilogramskim pakovanjima.Sad sam i zaboravio ali mi se cini da cena kante feropoksa 25 kg=15 kg Maestralovog kg pakovanja.


U svakom slucaju za ovakav brod se isplati kupiti kantu i sto ostane jednostavno baciti ako u blizini nemas neku siklju da i nju zastitis.

[BOKAC]

Zar u tu svrhu nije bolje i skuplje koristiti epoksi smolu nego epoksi prajmer?

Ovo o cemu mi pametujemo je osnova koja ide na ispeskaren lim a epoksi katran ili smola(kako ti volja) ide posle.

[Barba]

Epoksi smola nije epoksi katran.

[maki69]

Epoxy katran zovu i balastin.

[drug_igrutin]

ukupno - 58 kvm x 2 (unutra) = 116kvm  broda sa velikim povrsinama za farbanje...vecina brodica od 8m nema visinu boka 1m, i nisu mu bokovi ravni a svans ostar

Upravo je to cifra koju sam i ja dobio, a zaokružio je na 130 zbog rebara, a bokovi jesu u proseku oko 1 m.
Zbog viška i pitam dali je dovoljno da se sa unutrašnje strane nanesu samo 2 sloja feropoksa?
Naravno da odokativno mešanje komponenti A i B ne dolazi u obzir, ima na zorkinom sajtu i zapreminski odnos komponenti, pa se naprave mere za mešanje, nije to problem, a može i kantar (kuhinjska vaga) da posluži :smile:.

[BOKAC]

Epoksi smola nije epoksi katran.

Sta je epoxy smola?

[Barba]

@BOKAC

Epoksi katran je mesavina epoksi smole i katrana.

Background History

Coal tar epoxies are essentially a mix of coal tar and epoxy resins (and not all epoxy resins are the same). Coal tar epoxies were at their peak of popularity in the 1960's (???) through about 1990. After that, non-coal tar epoxies replaced coal tar epoxies due largely to health concerns over long term exposure and direct contact (by coating applicators) to the ‘tar'.

Advantages of Coal Tar Epoxies

Coal Tar epoxies are inexpensive compared to most non-coal tar epoxies. The offer considerably more flex (or elongation) then regular epoxies. This makes them useful on garage floors where turning/spinning tires will ‘stretch' the epoxy, as well is in situations with a lot of expansion and contraction. Coal Tar epoxies are also famous for protection from moisture, both in the water (such as barge hulls) and when buried underground (such as pipelines and underground tanks). A key advantage of coal tar epoxies is its ability to bond to oily surfaces (thanks to the hydrocarbon nature of the ‘tar').

Disadvantages of Coal Tar Epoxies

Coal Tar epoxies smell like tar/asphalt and leave an asphalt like stain on your hands, etc. when working with the un-cured epoxy. It only comes in a tar black color. Coal tar is not something you want to handle on a regular basis over a long periods of time.

Most or all of the other disadvantages of coal tar epoxies are often more about the epoxy side of the mixture rather than the coal tar side. Issues here can include solvents in the product, and poor resistance to UV (becoming more brittle and chalky), are the ones that come to mind. There are also reports that weathered coal tar is difficult to recoat or topcoat. At least some coal tar epoxies appear to leave behind an oily layer as the epoxies weather away and this layer makes topcoating - recoating difficult or impossible. The coal tar that we use does not appear to have this problem, at least it hasn't been reported to me yet.

Misc. Information

Coal tar epoxies (at least the version we sell) can be topcoated with regular paints. It can also be used with colored quartz sands or vinyl chips for decorative epoxy floors -just like non-coal tar epoxies are used.

When and Where I Would Recommend Coal Tar Epoxies

The less costly coal tar epoxy is often a better quality coating than an equally priced non-coal tar epoxy. A good quality (and more costly) non-coal tar epoxy will perform equal or better than a coal tar epoxy and will be available in colors other than black. The odor of coal tar epoxies (at least the one we sell) is not really that strong, still, I would use it in a well ventilated area or outdoors. The coal tar epoxies that I have tried (several brands) all seemed flow of the paint brush more smoothly than solvent free, non coal tar epoxies. This makes it a bit easier to apply and probably less likely to leave behind thin spots or ‘pinholes' in the coating surface.

Because coal tar epoxies will bond better than other epoxies to oily surfaces, they are more likely to remain bonded to ‘degreased' garage or work floors. I would consider their use, perhaps thinned with solvent, as a sealer/primer over such areas. The coal tar epoxy can then be topcoated with other coatings.

The much flex (bend) and elongation (pull) of coal tar epoxies (3 to 10 times the amount of regular epoxies and the only product we carry with BOTH flex and elongation - each about 25%) ) is its greatest characteristic and the case presented regarding the benefits of this property when used on garage floors, garage ramps, etc. where there is lots of rubber tire traffic, makes logical sense to me. However, I have not heard of less flexible, non coal tar epoxies failing in these situations either. Coal tar's ability to withstand moisture (old time sailors sealed their boats with tar pitch) is another important plus, but I think good quality, non coal tar epoxies offer just as good moisture sealing.

Coal tar epoxies are ‘out of style' but their usefulness has not diminished. A good quality coal tar epoxy offers a price to performance ratio that is hard to beat. Their greater flex is a real plus (although not as important in may situations as it might seem), while their messy tar staining and smell are a downside consideration. I think the decision to use coal tar epoxy can be made more on personal choice than on a point by point technical comparison, sort of like decision between an apple or orange with your lunch. Just remember that all coal tar epoxies (like all other epoxies) are not the same.

[poljo]

Neko spomenu boju za asfal kao zastitu , malo sam se zainteresovao pa nadjoh ovo: http://www.sitolor-medius.hr/graditeljstvo/fasada-beton/signocol/index.html
E sve je ovo lijepo i krasno ali ima jedan dio gdje govori na OTPORU u proklizavanju . Koliko bi to smetalo i povecavalo trenje trupa broda (camca) ? Koliko bi time bila povecana potrosnja goriva ?

[Kapetan]

ako po kisi ides po "zebri" primetices da je klizavija nego asvalt :) nije moj fah al mislim da nema frke...

[BOKAC]

Ako camac ima malo otpora u redu, sta cemo ako pocne da proklizava?

[poljo]

E jbg. Onda "slajdras" nogama ko po ledu dok se ne smiri i uhvati "spulnu".

[BOKAC]

Ma nije strasno, do toga ce dolaziti samo kad kisa pada.

[poljo]

HAHAHAHAHAAH! Dobar.

[Kapetan]

ne mora da se stabilizju :) ako kola nemaju kobilicu a idu preko "zebre" sta ce camcu....