RU1790586C - Composition for removing paint coatings - Google Patents

Abstract

Usage: cleaning of metal and other surfaces of varnish-and-paint coatings with different service lives in various fields of technology. SUMMARY OF THE INVENTION: the composition contains, parts by weight: methylene chloride 100.0, an organic acid with a carbon number of Ci-Cz 1.0-10.0, hydroxyethylidene diphosphonic or nitrolotrimethylphosphonic acid or their metal salts, modified in a ratio of 3.0 : 0.01 - “- 0.1 with a mixture of ethyl alcohol, ethyl acetate, butyl acetate or amyl acetate with a ratio of components of the mixture 0.5-2.0: 0.5-2.0: 0.05-2.0 30.0- 65.0 and a nonionic emulsifier 0.5-5.0. The components are sequentially mixed at 20 ± 2 ° C. Composition characteristics: removal efficiency of the coating with a life of 5 years (AK-070 soil in combination with enamel EP-140, enamel ML-165) 15-20.min, 5-7 min, respectively. 5 tab.

Description

The invention relates to the paint and varnish industry, in particular to compositions for removing paint and varnish coatings from metal and other surfaces with different useful lives (up to 3 years or more), without the use of mechanical cleaning agents.

AFT-1 formulation for removing paintwork is known, containing formalglycol, toluene, acetone, colloxylin, paraffin.

Also known is a paint remover composition comprising methylene chloride, ethyl alcohol, a Ci-C3 organic carbon atom, a nonionic emulsifier, and a co-solvent: a dioxane derivative.

Closest to the invention in terms of effectiveness is a composition for removing paintwork, including, by weight:

Methylene chloride

Butyl acetate

Ethyl acetate

Butanol

Cyclohexanone

Toluene

This zero

Formic acid

Xylene

Expanded polystyrene

Said composition is toxic and has insufficient effectiveness in removing paint coatings with different useful life.

The purpose of the invention is to increase the removal efficiency of coatings with different useful lives.

This goal is achieved in that the composition for removing paint coatings, including methylene chloride and an organic acid with the number of carbon atoms Ci-C3, additionally contains hydroxyethylidene diphosphonic or nitrolotrimethylphosphonic acid or their metal salts, modified in a ratio of 3.0: 0.01 -0.1 with a mixture of ethyl alcohol, ethyl acetate, butyl acetate or amyl acetate at a ratio of 6.5-2.0: 0.5-2.0: 0.05-2D and a non-ionic emulsifier with a ratio of 1Co components, max .:

Methylene chloride. 100.0 Organic Atoms

carbon Ci-Cz1.0-10.0 hydroxyethylidene diphosphonate or nitrilotriethylphosphonic acid or their metal salts, modified with a ratio of 3.0: 0.01-0.1 with a mixture of ethyl alcohol, ethyl acetate, butyl acetate or amyl acetate with a ratio of 0.5-2.0: 0.5-2.0: 0.05-2.0 30.0-65.0 Nonionic emulsifier 0.5-5.0 Hydroxyethylidene diphosphonic or nitrilotrimethylphosphonic acid or their salts pre-modified with a mixture of ethyl alcohol and esters of acetic acid and are a colorless or slightly yellowish liquid with a specific ethanol and acetic acid, obtained as follows: in a mixer with constant stirring at a speed of 60-90 rpm sequentially load ethanol and esters and acetic acid (ethyl acetate, butyl acetate or amyl acetate) in a ratio of 0.5-2 0: 0.5-2.0-0.05-2.0. Stirring is carried out at 18-30 ° C for 10-15 minutes. Then, the resulting mixture is introduced into hydroxyethylidene diphosphonic or nitrilotrimethylphosphonic acid or their salts (potassium, sodium, zinc) in a ratio of 3: 0.01-0.1.

The composition uses methylene chloride according to GOST 9968-73.

The composition uses methylene chloride according to GOST 9968-73.

The composition uses an organic acid with the number of carbon atoms Ci-C3, namely, formic, acetic, propionic; non-ionic surfactants are used as emulsifier

substances - ethylene glycol ethers of alkyl phenols SpN2p + SbH40 (C2H40) tN, where n is 8 + 10; t 6 + 7 and t 10-12 (OP-7 or OP-70 - GOST 8433-81).

To remove coatings from large-sized parts, a thickener in an amount of 10-30 m.h. Paraffin, aerosil, thixotrol with chloroparaffin, cellulose esters (carboxymethyl cellulose, hydroxymethyl cellulose, etc.), organic resins (polyvinyl chloride, perchlorovinyl resin, etc.) are used as a thickening agent.

Examples of composition are given in table. 1.

The compositions are prepared by mixing all the components in the mixer in the following sequence: first, hydroxyethylidene diphosphonic or nitrilotrimethylphosphonic acid or their salts pre-modified with a mixture of ethyl alcohol and acetic acid esters are charged into a reactor equipped with a working stirrer, reflux condenser and cooling jacket.

load all other components in any sequence and mix until smooth at a temperature of 20 ± 2 ° C.

Application of the composition to large-sized products is carried out with a spatula or brush. In other cases, the composition is applied in bathtubs.

The resulting compositions are used to remove coatings based on polyacrylate 5 (primer AK-070), epoxy-polyamide (enamel EP-140), melamine-formaldehyde (enamel ML-165), polyvinyl acetate (VL-02), epoxy (EP-755), perchlorovinyl (enamel XB-53), phenol-formaldehyde

0 (primer FL-OZK), pentaphthalic (PF-115 enamel) and glyphthalic (GF-020) resins.

The test results of the compositions for removing paint coatings are given in table. 2-4.

5 The toxicity of the compositions was evaluated by the content of methylene chloride in the air by gas-liquid chromatography.

The state of the metal surface after exposure to formulations to remove coatings was evaluated

visually. For this, metal rusty

the plates were immersed in the compositions for 30 minutes, and

then they were removed and inspected.

As follows from the data given in

5 tables, the proposed composition for removing paints and coatings has, in comparison with the prototype, increased effectiveness with respect to coatings with different durability and low toxicity. In addition, the proposed composition ensures the absence of corrosion products on a metal surface from which the paintwork has been removed.

Claims (1)

The claims The composition for removing paint coatings, including methylene chloride and an organic acid with the number of carbon atoms Ci-Cz, characterized in that, in order to increase the efficiency of removal of coatings with different lifetimes, it additionally contains hydroxyethylidene diphosphonic or nitrilotrimethylphosphonic acid or their metal salts modified in a ratio of 3.0: 0.01-0.1 with a mixture of ethyl alcohol, ethyl acetate, butyl acetate or amyl acetate with a ratio of 0.5-2.0: 0.5-2.0: 0.05-2.0 and nonionic emulsifier in the ratio of components ntov, mae.ch ,: Methylene chloride An organic acid with the number of carbon atoms of Ci-C3 hydroxyethylidene diphosphon or nitrile trimethylphosphonic acid or their metal salts, modified in the ratio 3.0: 0.01-0.1 with a mixture of ethyl alcohol, ethyl acetate, butyl acetate or amyl acetate the ratio of 0.5-2.0: 0.5-2.0: 0.05-2.0 nonionic emulsifier Table Table 2 The effectiveness of the compositions to paint coatings with a service life of 1 year TABLE 3 Effectiveness of the compositions for paint coatings with a service life of 5 years Table 4 Concentration of methylene chloride in the air of the production room, mg / m3 Table 5 The state of the metal surface after exposure to paint removers