RU1786051C - Lacquer - Google Patents

Abstract

Use: corrosion protection of metal structures, ceramic and concrete surfaces. The inventive lacquer contains (in wt.%) Polystyrene 15-30; coal tar 3.0-3.5; ethyl silicate; 5-1.5; the condensation product of α-aminopropyltriethoxysilane 1-6; organic solvent - the rest. The varnish is prepared by mixing in it in the GBMO of the Sha-tsiyoy mixture and its filtration. The coating is dried to st. 3 at 20 ° C 90 min. Coating characteristics: adhesion 1 point; elasticity 1 mm; service life not less than 3.6 years. 2 tab.

Description

The invention relates to the production of paints and varnishes, namely, varnishes based on synthetic film-forming (polystyrenes), intended to protect metal structures, ceramic and concrete surfaces from corrosion.

Corrosion protection paints based on a variety of polymers are known. Coatings based on alkyd resins with sufficient weather resistance and elasticity have low water and chemical resistance, as well as a long drying time (Reibman A.I. Protective paint and varnish coatings in chemical industries, M. Livshits, Paint and varnish materials).

Phenol-formaldehyde paints and varnishes at high hardness, heat and chemical resistance have poor adhesion to the painted surface, coatings are unstable under mechanical stress due to the fragility of the film (Reibman A.I. Protective coatings in chemical.

productions. Livshits M.L. Paints and varnishes).

Closest to the technical nature of the invention is the polymer base for the polystyrene composition (TU 88 of the Ukrainian SSR 005-86), adopted as a prototype and having the following composition, parts by weight:

Polystyrene 10 Coal tar 4 Toluene 60 Ethyl alcohol 0.17 0-phenylenediamine 0.07 The disadvantage of this composition is the low adhesive strength of the resulting coating on metal surfaces, especially smooth ones, and low bending elasticity.

The aim of the invention is to improve the physicomechanical properties of the resulting anti-corrosion coatings, increase bending elasticity, metal adhesion and durability.

ate

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This goal is achieved in that the varnish based on synthetic film-forming substances, along with polystyrene, coal tar and an organic solvent, additionally contains ethyl silicate and the condensation product of γ-aminopropyltriethoxysilane in the following ratio of components, wt.%:

Polystyrene15-30

Coal.

resin. 3-5

Ethyl silicate; 0.5-1.5

Condensation product

y-aminopropyltriethoxysilane 1-6

Solvent

The solvent used is toluene or individual xylenes, or a mixture thereof, or a mixture of toluene with xylenes in various ratios, or a solvent solvent. Varnish is prepared by mixing the components, homogenizing the mixture and filtering it. In this case, dissolution is first carried out; polystyrene, conditional viscosity is adjusted to a value of 20-50 s (depending on the planned method of applying varnish), coal tar is added, mixed, filtered, ethyl silicate and the condensation product of y-aminopropyltriethoxysilane are introduced.

The claimed composition of the varnish differs from the prototype by the introduction of new components, namely ethyl silicates and condensation products of α-aminopropyltriethoxysilane.

The introduction of these modifiers gives the varnish new properties: increased elasticity in bending and high adhesion to a metal surface.

Example. 50 g of polystyrene are dissolved in 130 g of an organic solvent with stirring for T h at ambient temperature. The relative viscosity of the resulting solution is 32.8 s with a VZ-4 viscometer. Then, with the stirrer working, 8 tons of coal tar are charged, stirred for 0.5 hours and filtered to

mechanical impurities. 2 g of ethyl silicate are added and stirred for 0.5 h, then 10 g of the condensation product of γ-aminopropyltriethoxysilane are loaded and the mixture is stirred for 0.5 h. The quality parameters of the obtained varnish and its coatings are given in Table 2 ( example 4).

Claims (1)

For experimental verification of the claimed varnish composition, prototypes were prepared containing modifying additives in various ratios, as well as the composition adopted for the prototype (Table 1). The claimed composition of the varnish showed good results in such quality indicators as bending elasticity, adhesion to metal, resistance to temperature drops from +90 to -60 while maintaining high water resistance and resistance to ultraviolet radiation. The results are shown in Table 2, where Example 1 - with a minimum boundary content of components in a varnish, Example 2 - with a maximum boundary content of components, Examples 3-4 with optimal ratios of components in a varnish, Example 5 - Polymer base for polystyrene composition TU 88 USSR 005-86 (comparative prototype). Formula of the invention A varnish comprising polystyrene, coal tar and an organic solvent, characterized in that, in order to increase adhesion to metals, elasticity and durability, it further comprises ethyl silicate and a condensation product of y-aminopropyltriethoxysilane in the following ratio, wt.%: coal polystyrene resin ethyl silicate condensation product of y-aminopropyltriethoxysilane organic solvent Table 1 table 2