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Acrylic lacquer spray paint

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Acrylic lacquer spray paint

Post  specialistsea on Wed Apr 04, 2012 1:46 pm

Hello all,
Could anyone give me a rough idea of what hazardous chemicals would be created if acrylic paint which contains isocyanate is burned please.
It is being burned in the form of overspray as cars are painted, it goes through a butane powered space heater and burns in with the jet.
Its not me who is doing this by the way, im just curious of just how nasty the gases must be.
Thankyou in advance.
Gary

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Re: Acrylic lacquer spray paint

Post  gasgrassorarse on Fri Apr 06, 2012 9:07 pm

specialistsea wrote:Hello all,
Could anyone give me a rough idea of what hazardous chemicals would be created if acrylic paint which contains isocyanate is burned please.
It is being burned in the form of overspray as cars are painted, it goes through a butane powered space heater and burns in with the jet.
Its not me who is doing this by the way, im just curious of just how nasty the gases must be.
Thankyou in advance.
Gary

Not sure of the exact answer here, but after 25 years of industrial painting in a booth, I can tell you that isocyanate is carcinogenic. That is one thing that you sure want to stay away from!

The isocyante most commonly used in paints, coatings, leather finishings, and foams, is Naphthalene diisocyanate.

Isocyanates are carcinogenic, and also create respiratory failure through things like Asthma!

ALL the painters I know, automotive or industrial, who use any paint with isocyanates ALL use fully enclosed suits with filtered ventilated hoods.

I cant tell you how fast the isocyanates act on the human body, but I do know that there have been many other instances of chemical exposure and the effects of exposure can take many many years to show.

My Grandfather, through his work in world war 2, was exposed to a mixture of chemicals which were used daily, 20-30 years later he was showing minor signs of effects, 30-40 years later he was in extremely poor health, his nervous system was extremely effected, his brain function was effected, and there were cancers and tumours showing up all over his body, and were all linked to the chemicals exposure when he was in his early 20's.

Some isocyanates evaporate into the air and can pose a health risk. Isocyanate mist and vapour can be released into the air by a variety of work activities, including:
Spraying paints or foams containing isocyanates
Heating polyurethane plastics
Cutting polyurethane foams using hot wire cutting methods
Applying varnish
Manufacturing urethane foam forms
Hand painting or rolling isocyanate coatings

Isocyanates are irritants to the eyes, skin, and respiratory system. Short-term exposure can cause dermatitis and irritation or burns to the eyes, nose, and throat. Even a small amount of isocyanates can produce significant health effects, such as asthma.

It has been estimated that 1 in 20 workers who work with isocyanates will become sensitized to them. Some worker deaths from isocyanate asthma have also been reported.

Sensitization is permanent—workers who become sensitized can no longer be exposed to isocyanates without experiencing a reaction—often a severe one.

Symptoms of isocyanate exposure include

Sore eyes
Running nose
Sore throat
Coughing
Wheezing (asthma)
Chest tightness
Isocyanates can have a fruity, musty, or pungent odour. Do not use odour to identify hazardous concentrations of isocyanate, because once you can smell it, it is above the permissible concentration. Your sense of smell will not warn you that you are being overexposed to isocyanates until it is too late.

Exposure to airborne isocyanates may cause eye irritation, tearing, and a temporary decrease in sharpness of vision. Direct contact with isocyanates—a splash to the eye, for example—can cause irritation, conjunctivitis (irritation of the membrane lining the eyelids and part of the eyeball), and eye tissue damage.

Direct skin contact with unreacted isocyanates can cause rashes, blistering, and reddening of the skin. In rare cases, the skin can become so sensitized that severe skin reactions will occur through contact with small amounts of isocyanate. Skin exposure can also cause the entire body to become sensitized.

Worker responsibilities:
To help reduce the risk of exposure to isocyanates, workers (including subcontractors) must
Attend education and training sessions provided by the employer
Use controls and follow safe work practices outlined in the exposure control plan
Use available personal protective equipment (for example, airline respirators) as required
Know how to report exposure incidents

Fires—Isocyanates, and most substances containing them, are flammable. They will burn and release toxic gases such as carbon monoxide, nitrogen oxides, and hydrogen cyanide. Burning polyurethane products made with isocyanates may release a number of hazardous substances, including benzene, toluene, carbon monoxide, nitrogen oxides, and hydrogen cyanide.

Isocyanates should be treated as a Class C fire hazard—do not use water or foam-containing fire extinguishers. Use a CO2 or dry chemical extinguisher to put out flames. In the case of a major fire, firefighters must wear self-contained breathing apparatus (in positive-pressure mode) to protect them from toxic fumes.

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Re: Acrylic lacquer spray paint

Post  gasgrassorarse on Fri Apr 06, 2012 9:20 pm

Ps: just found this in one of my reference texts:

Any diisocyanate involved in a fire will evolve fumes in highly toxic concentrations.
The fumes include carbon monoxide, oxides of nitrogen, isocyanates and to some extent, hydrogen cyanide.


Yes, I know I certainly would not want to be breathing in those!

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