SU909973A1 - Composition for anticorrosion treatment of steel surfaces - Google Patents

Abstract

A COMPOSITION FOR THE ANTI-CORROSION PROTECTION OF STEEL SURFACES, including the iocyanate component and the hydroxyl-containing 991st polyester, characterized by. the fact that, in order to simplify the deposition technology, the surface of this composition, as well as increase the strength, heat resistance, chemical resistance and service life of protective coatings obtained on its basis, it contains as an isocyanate component the bottom residue of diphenylmethane diisocyanate production with the content of free isocyanate groups equal to 23-29%, as a hydroxyl-containing polyester, it contains phthalic anhydride-based polyether and ethylene glycol, and additionally contains diethylene glycol, with triethanol n and andesitovpo flour or a mixture of cement and sand in a 1: 1 ratio with the following ratio of components, weight.h ;; VAT residue of production of diphenylmethane diisocyanate 100-120 Hydroxyl-containing polyester based on phthalic anhydride and ethylene glycol 20-50 Diethylene glycol 20-40 Triethanolamine2-5 Andesite flour or a mixture of cement and sand .1: 1100-200

Description

The invention relates to polymer compositions, in particular to compositions for IT corrosion protection of steel surfaces, and can be used in various industrial fields to protect metal surfaces of various structures from electrochemical corrosion and corrosive media. The known polymer composition for anticorrosive protection of structures and equipment based on aqueous emulsions of carboxically polyurethanes, which are dispersed by dispersing a mixture of two or more isocyanate groups and polyether based on dicarbonic anhydride ClJ in an aqueous alkaline medium. However, the composition does not have sufficient adhesion to the rusty metal surface and is multi-component and difficult to work. The closest to the technical essence is a composition for anticorrosive protection of steel surfaces, including the isocyanate component and the hydroxyl-containing polyether C 2. The polyisocyanate isocyanurate structural polymer is used as the isocyanate component, and the polyether polyol with primary OH groups (9.2%) in a 25% solution of cyclohexanone is used as the hydroxyl-containing polyether. The disadvantages of this composition are low heat resistance (up to) and chemical resistance in aggressive environments over: in NaOH solutions and not more than 6 months in HCQ solutions not more than 2 months. In addition, prior to applying the composition to the protected steel surface, pre-cleaning is required. The aim of the invention is to simplify the technology of applying this composition to the surface, as well as to increase the strength, heat resistance, chemical resistance and service life of the protective coatings obtained on its basis. This goal is achieved in that the composition for anticorrosive protection of steel surfaces, including an isocyanate component and a hydroxyl-containing polyester, contains as an isocyanate component as the residual production of diphenylmethane diisocyanate with free isocyanate groups equal to 23-29%, as a hydroxyl-containing polyether contains polyether-based phthalate anhydrite and ethylene glycol and additionally contains diethylene glycol, triethanolamine and andesitic flour or a mixture of cement and sand in co 1: 1 ratio with the following ratio of the components of the composition, weight.: Vat residue from the production of diphenstme 100-120 tandiisocyanate Hydroxyl-containing polyether based on phthalic anhydride 20-50: c ethylene glycol Diethylene glycol Triethanolamine Andesitic flour or a mixture of cement and sand 1: 1 100- 200 Techniques for applying the composition BKJB04aeT to the following operations: priming the preparation and dispensing of the initial components, preparing the composition of the desired viscosity by successively adding and mixing the components, applying the composition to surface of steel pipes and structures. Curing of the composition takes 2 hours at 2025 s. The total time of application of the protective composition to the surface of steel pipes of an average calculated diameter D equal to 100 mm in mass production does not exceed 3 minutes. In tab. 1 shows examples of compositions for corrosion protection of steel structures. Properties of protective coatings based on this and known compositions are given in table. 2. Reduced operating costs are due to the exclusion

operations to prepare the surfaces of steel pipes under the cover, reducing the costs of materials due to the use of-.

use of waste products, as well as by increasing the service life of protective coatings.

Andesitic flour (or a mixture of cement and sand 1: 1)

200

150

90

250

Claims (1)

COMPOSITION FOR ANTI-CORROSION PROTECTION OF STEEL SURFACES, including an isocyanate component and a hydroxyl-containing polyester, characterized in that, in order to simplify the application technology, on the surface of this composition, as well as to increase the strength, heat resistance, chemical resistance and service life of the protective coatings obtained on its basis, as an isocyanate component, it contains a bottom residue of the production of diphenylmethanediisocyanate with a free isocyanate group content of 23-29%, as a hydroxyl-containing polyester, it contains a polyester based on phthalic anhydride and ethylene glycol and additionally contains diethylene glycol, triethanolamine and andesitic flour or a mixture of cement and sand in a ratio of 1: 1 in the following ratio, wt.h. : VAT residue production diphenylmethane 'diis cyanide ata 100-120 Hydroxyl-containing polyester based on phthalic anhydride and ethylene glycol 20-50 Diethylene glycol 20-40 Triethanolamine 2-5 Andesitic flour or a mixture of cement and sand .1: 1 '100-200 SU „„ 909973 1 909973