Definition of paint stripper and paint stripping principle

Paint stripper, also known as paint stripper, paint washer or paint remover, is a mixture of chlorinated hydrocarbons, ketones, esters, alcohols, benzenes and other solvents from the liquid. The solvent has the property of permeating and swelling to the covering material, can effectively remove all kinds of substrate surface covering material (paint, coating, etc.). The paint can be removed directly or the paint film can be removed easily. The paint stripping effect of paint stripper is achieved through a series of physical and chemical processes such as dissolution, penetration, swelling, stripping and reaction.

Types of paint stripper

On the one hand, alkali saponifies some groups in the paint and dissolves in water, on the other hand, hot steam cooks the paint film, causing it to lose its strength and reduce its adhesion to the metal, coupled with the surfactant’s infiltration, penetration and affinity, the old coating will be faded.

Acid paint stripper: Acid paint stripper due to concentrated hydrochloric acid, nitric acid volatilize easily to produce acid mist, and have a corrosive effect on the metal substrate, concentrated phosphoric acid fade for a long time, also have a corrosive effect on the substrate. Concentrated sulfuric acid and aluminum, iron and other metals passivation reaction, so metal corrosion is very small, and at the same time has a strong dehydration, carbonization and sulfonation of organic matter and make it dissolved in water, so concentrated sulfuric acid is often used in acid paint stripper.

Ordinary solvent paint stripper: Ordinary solvent paint stripper is composed of ordinary organic solvent mixed with paraffin wax, etc. They have paint stripping effect on alkyd paint, nitro paint, acrylic paint and perchloroethylene paint, etc. However, the organic solvent in this kind of paint stripper has a strong dehydration, carbonization and sulfonation effect on organic matter. However, the organic solvent in this type of paint stripper is volatile, flammable and toxic, so it should be applied in a well-ventilated area.

Chlorinated hydrocarbon solvent paint stripper: Chlorinated hydrocarbon solvent paint stripper solves the problem of paint stripping for epoxy and polyurethane coatings, it is easy to use, highly efficient and less corrosive to metals.

Water-based paint stripper: Compared with the traditional dichloromethane paint stripper, it is less toxic and has the same speed of paint stripping. It can remove epoxy paint, epoxy zinc yellow primer, and especially good for aircraft skinning paint.

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