CS225007B1 - The coating composition made on the base of the polycondensate of the dialkoxychelate for anticorrosive coats - Google Patents

Description

(54) Paint based on aluminum polycondensate dialkoxychellate for anticorrosive coatings

The present invention relates to a coating composition for corrosion resistant coatings resistant to higher temperatures.

For many engineering products, their surfaces need to be protected by coatings that resist not only high temperatures in their operating conditions, but also the effects of atmospheric corrosion in the period from painting to operational time.

The coatings used for these conditions usually contain a binder consisting of polycondensate hydrolysis products of aluminum dialkoxy chelates, polymeric butyl titanates and the like and pigmented mostly with powdered aluminum, which on the one hand has high thermal stability, good thermal conductivity and .

However, the coatings formed by said coating components offer very little protection against atmospheric corrosion, in particular when exposed to the outdoor atmosphere during storage and transport.

This leads to corrosion of the coating, the coating loses its adhesion, peeling off and completely exposes the surface, for example of the underlying steel sheet.

In order to increase corrosion protection, paints for environments with higher atmospheric corrosion protection also contain anticorrosion pigments, especially based on chromates.

However, paints with chromate-type anticorrosive pigments can only be applied by spraying with strict observance of occupational safety, ie spraying in well-extracted booths or through tunnels so that sprayers are not contaminated by these industrial pollutants.

In the case of many large-area or large-scale products, high-temperature coatings with inorganic, harmful pigments cannot be used for hygiene purposes.

It is an object of the invention to overcome these disadvantages of known paints.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a coating composition which is particularly resistant to atmospheric corrosion and is harmless to health in use.

The object is achieved by the coating composition according to the invention, which comprises 14 to 30 wt. polycarbonate of aluminum dilkoxy chelate of the building unit —Al ^ —CH ₂ - CH ₂ - OOOI II cc

% ^CH 2 CH 2 OC 2 H ₅ to 60 wt. % xylene, 15 to 31 wt. % of aluminum powder, 1.5 to 8 wt. % polystyrene and 0.8 to 12 wt. imidazoline derivatives of the general formula

Ro R.

I ^J Γ

Ro C C Rc_I I

RCOO ° NH ® N - (CH 3) _n -x

X /

C —R-, wherein Rg, Rj, R>> 85 is hydrogen, or alkyl, Rg Rg is hydrogen or alkyl or alkanyl, X is either H ^N®®OCOCR,, or NHCORg, n is any integer greater than 1 and R 6, R 8 denotes alkyl or alkenyl, the number of carbons in the alkyls and alkenyls R 1, R 8 and R 6 being 15 to 24.

Example 1

Aluminum polycondensate dialkoxy chelate 30 wt. Xylene 47 wt. Aluminum powder 15 wt. Polystyrene 2 wt. An imidazoline derivative consisting of a diethylenetriamine with oleic acid 6% by weight.

Example 2

Aluminum polycondensate dialkoxy chelate 14%

Xylene 45,5%

Aluminum powder 31%

Polystyrene 6%

An imidazoline derivative consisting of a reaction product of triethylene amine with tall oil carbonic acid of 3.5 wt.

wt.

wt.

wt.

wt.

Example 3

Aluminum polycondensate dialkoxy chelate 19

Xylene 40

Powdered aluminum 27.5

Polystyrene 1,5

An imidazilin derivative consisting of the reaction product of triethylenetetramine with oleic acid 12% wt. % wt. % wt. % wt.

wt.

Example 4

Aluminum polycondensate dialkoxy chelate 12 - % wt. Xylene 12 % J & iot. Aluminum powder 19.2 % wt. Polystyrene 8 %> wt. The imidazoline derivative formed by the reaction product of triethylamine only amine with tall oil carbonic acid 3.5 % wt.

The polycondensation hydrolysis products of aluminum dialkoxylates are dissolved in xylene, in which the polystyrene is dissolved for a longer time, and after mixing, powdered aluminum and imidazoline derivatives are added and the resulting coating composition is homogenized. This results in a coating material which, when sprayed onto the metal, dries in the air to a non-sticky condition and produces a coating with good resistance to atmospheric corrosion and, after firing at 130 to 200 ° C, withstands operating conditions such as textile machines.

Polycondensates of aluminum dialkoxy chelate with a structural unit of the formula - " ^CH " ° -

O II II c c

CH ₃ CH ₂ O ₂ H ₅ is the binder component of the paint. These products are converted to aluminum and alumina at elevated temperatures and both of these components can withstand temperatures up to 400 ° C over the long term.

This function of the binder also fulfills the butyl titenate, which after firing produces titanium dioxide or, in admixture with powdered aluminum, a mixture of alumina and titanium dioxide.

Polystyrene dissolved in xylene serves as a supplementary binder component, which closes the system especially before the paint is burned out, when the aluminum polycondensate dialkoxy chelate is not sufficient to protect the metal substrate from corrosion. Polystyrene creates high resistance especially to high relative humidity, water and chemically aggressive substances.

Aluminum powder in flake form is a pigment which does not change due to high temperatures and in the flake form provides barrier protection against penetration of aggressive corrosive components to the parent metal, in particular by significantly reducing the porosity of the coating formed.

Imidazoline derivatives of the general formula

Ro R.

IJ r ₂ —c - c— r ₅

COO®NH® R _g N- (CH ₂₎ "- X

CR, where R _a, R ,, R · R _A is hydrogen or alkyl, R, R _fi represents hydrogen or alkyl group whose alkenyl znaV X 4? after λ (whose cell the H 4 N OOCRy group, or the KHCOR 8 group, n denotes any integer greater than 1 and Ry, R 8 denotes alkyl or alkenyl, the number of carbons in the alkyls and alkenyls, R 8 and R 7 being 15 to 24, forms an absorption-type inhibitor in the coating composition, which effectively protects ferrous and non-ferrous metals against corrosion, especially atmospheric, water and the environment of acids and salts, such as chlorides.

It supplements the polystyrene component with an inhibitory system of its action and causes a higher thermal stability of the entire coating, as it is only a thermo-oxidizing stabilizer.

Claims (1)

SUBJECT OF THE INVENTION Coating composition based on polycondensate tilinium diacrylate chelate characterized in that it contains 14 to 30 wt. of polycondensate of aluminum etEUuctural unit of formula for anticorrosive coatings, dialkoxycholate --AH - CH - CH - O— ' O O AND. CHCl 3 OC ₂ H ₅ 40 to 60 wt. % xylene, 5 to 31 wt. % of aluminum powder, 1.5 to 8 wt. % polystyrene and 0.8 to 12 wt. imidazoline derivatives of the general formula Rq R. | d | 4 r ₂ - c — c — r ₅ RgCOO®NH® L- (CH ₂ ) _n -X XR, where R ₂ > R 3> ^H 4> ^R 5 denotes hydrogen or alkyl, R 1, R g denotes hydrogen or alkyl or alkenyl, X denotes either a group Η ^ Ν® ® ΘΟΟΗγ or NHGORg, n denotes any integer greater than 1 and R? and R 8 is alkyl or alkenyl, wherein the number of carbons in the alkyl and alkenyl groups R ₁ , H ₆ and R _? is, 5 to 24.