PL197328B1 - Anticorrosive agent - Google Patents

Abstract

Anticorrosion agent based on an aqueous polyurethane dispersion, containing pigments, fillers, drying catalysts and auxiliary agents in amounts ensuring the achievement of the assumed properties, characterized in that it contains 30-70 parts by weight of a film-forming substance, which is an aqueous polyurethane dispersion modified with 48% fatty acids with a carbon content preferably from C10 to C18 with an unsaturated/saturated acid ratio preferably of 1.4, and 10-35 parts by weight of pigments and fillers.

Description

REPUBLIC

POLAND

Patent Office of the Republic of Poland (12) PATENT DESCRIPTION (19) PL (11) 197328 (13) B1 (21) Application number: 338655 (51) Int.Cl.

C23F 11/10 (2006.01) C09D 5/08 (2006.01) (22) Date of filing: 24/02/2000 (54)

Anti-corrosion agent

(73) Patent holder: (43) The application was announced: METALCHEM Institute of Plastics Processing, Toruń, Poland 27/08/2001 BUP 18/01 (72) Inventor(s): Urszula Siwoń, Mikołów, PL (45) The patent was granted on: Joanna Drobionka, Gliwice, PL 31/03/2008 WUP 03/08 (74) Attorney: Michalak Jan

(57) An anticorrosive agent based on an aqueous polyurethane dispersion, containing pigments, fillers, drying catalysts and auxiliary agents in amounts ensuring the achievement of the assumed properties, characterized in that it contains 30-70 parts by weight of a film-forming substance, which is an aqueous polyurethane dispersion modified with 48% fatty acids with a carbon content preferably from C10 to C18 and an unsaturated/saturated acid ratio preferably of 1.4, and 10-35 parts by weight of pigments and fillers.

PL 197 328 B1

Description of the invention

The invention is a water-based, single-component polyurethane anticorrosive agent. The agent is intended for the anticorrosive protection of substrates, particularly steel, cast iron, and aluminum, in mild to moderately corrosive environments.

Water-based products constitute a new ecological generation of paint products and are one of the directions of reducing the emission of organic components.

Water-based, air-drying coatings have been around for over 15 years. These products are based on aqueous polymer dispersions, such as acetylene, polybutadiene, and alkyd emulsions. The properties of coatings obtained from these products are comparable to those of medium- to low-end solvent-based products.

Well-known varnish products based on polyurethane dispersions are gaining more and more importance due to the very good physical and mechanical properties of coatings obtained on their basis.

Paint products based on polyurethane dispersions guarantee minimal emission of flammable organic solvents that pollute the environment.

Most known paint products containing aqueous polymer dispersions dry physically, which results in a certain thermoplasticity of the coatings and the associated poor resistance to organic solvents and elevated temperatures.

Known varnish products based on alkyd emulsions dry oxidatively, but the resulting coatings have poor resistance properties and also age quickly over time.

The use of known products based on aqueous polymer dispersions or alkyd emulsions requires very thorough preparation of the substrate using the abrasive blasting method.

The inventive agent comprises 30-70 parts by weight of a film-forming agent, which is an aqueous polyurethane dispersion modified with 48% fatty acids, preferably with a carbon content of C10 to C18, and a preferred unsaturated/saturated acid ratio of 1.4, and 10-35 parts by weight of pigments and fillers. Furthermore, the agent contains drying catalysts and auxiliaries known and used in this type of coating products, such as antifoaming agents and rheology modifiers, used in amounts sufficient to achieve the desired properties.

Organic and inorganic pigments are used as pigments, including anti-corrosion pigments and fillers such as microtalc and chalk.

The invention allows for the production of adhesive coatings for smooth metal substrates, including steel, aluminum, and non-metallic substrates such as wood and concrete.

The agent according to the invention is obtained by methods commonly used in the paint industry.

Thanks to the use of a film-forming substance and drying catalysts, the agent according to the invention can be dried at both ambient and elevated temperatures. The agent dries in a combined manner, namely, physical drying is followed by oxidative crosslinking.

The agent according to the invention offers a number of advantages. The main advantages include its ability to properly wetting and penetrate the substrate, so using the agent does not require appropriate surface preparation using the abrasive blasting method, while its rapid drying allows for a shorter time between applying subsequent layers of products.

Another advantage of the agent is the possibility of applying subsequent layers of both water-based and solvent-based products, including two-component polyurethanes.

The agent according to the invention is presented in more detail in the following embodiment.

Example

Polyurethane dispersion modified with fatty acids 48% with a C14 carbon content and an unsaturated/saturated acid ratio of 1.4 - 50.0 parts by weight

Zinc phosphate -12.0 parts and weight

Iron oxide red - 6.0 pieces/piece

Mikrotalk -1,,0 bit/vgoo^wcch

Aerosil 200 (anti-settling agent) - ,,0 zęęśco/vgoo^wcch

Disperbyk 184 (dispersing agent) - ,,0 zęęścowgoo^wcch

Cobalt siccative - water emulsion - 1.0 parts/vg^oovcch

PL 197 328 B1

Additol XL 297 (anti-skin agent) Byk 022 (anti-foam agent)

Rhedate 255 (thickening agent)

Water

- 0.6 parts by weight

- 0.4 parts by weight

- 0.1 parts by weight

- 15.0 parts by weight

Claims (1)

Patent claim Anticorrosive agent based on water polyurethane dispersion, containing pigments, fillers, drying catalysts and auxiliary agents in amounts ensuring achievement of the desired properties, characterized by the fact that it contains 30-70 parts by weight of a film-forming substance, which is a polyurethane water dispersion modified with 48% fatty acids with the content of carbon preferably from C10 to C18 with an unsaturated / saturated acid ratio preferably of 1.4, and 10-35 parts by weight of pigments and fillers.