Protective-decorative silicate coating

FIELD: chemistry.

SUBSTANCE: invention relates to chemical composition of protective-decorative silicate coating and can be applied for painting metallic external and internal surfaces in order to protect them from corrosion and give them decorative look. Protective-decorative silicate coating contains liquid silicate glass, aluminium powder, surface-active substance sulphopolyethyleneglycol, technical finely disperse chalk with particle size not larger than 10 mcm, latex, polyorganic siloxanes and water.

EFFECT: invention provides high adhesive strength between single-package coating and metallic surface of both non-subjected to corrosion and subjected to different degree of corrosion.

1 tbl, 3 ex

 

The invention relates to the chemical composition of protective and decorative silicate coating and can be used for painting metal exterior and interior surfaces in order to protect them from corrosion and give them a decorative look.

Almost all the known compositions of silicate coatings are intended for colouring silicate, ceramic and wooden surfaces. As for metals, information about recipes for coloring are rare. So, a well-known recipe silicate coatings based on modified liquid glass comprising silica component, talc, oxide of the transition s2element, deflocculant, organic modifier and thixotropic additive (patent RF 2272820, publ. 27.03.2006). This composition allows to increase the vitality and retention of paint, to reduce its cost while ensuring high levels of opacity, adhesion, water resistance, frost resistance and the desired viscosity. Is this recipe exclusively for painting brick, concrete, plaster and wood. However, specifies that it can also protect the metal from oxidation. The tests showed that the adhesion of such coatings to metal surfaces is extremely low and the method of lattice cuts on the OST 15.140-78 is 3 points.

Closest to the patentable invention is the composition according to the patent of Russian Federation №2066336 (publ. 10.09.1996), the formulation includes the following ingredients, wt.%:

Kaolin enriched for ceramic products14-15
Talc powder for the ceramic industry10-11
Aluminum powder5-6
Liquid sodium glass68-71

The protective coating according to this prototype, is formed by pre-patterning the surface of the primer in the form of 10 wt.%-aqueous solution of sodium silicate with a modulus of 4.0-4.5 and a density of 1.18-1.19 g/cm3that is applied with a flow rate of 60-70 g/m20.1 mm thickness corrosion. Further drying at 4-30°C. After drying, apply face layer of paint above recipe. Indicates that the adhesive strength of such dvuhpilonnogo covering high and is the method of lattice cuts on GOST 15.140-78 1 point.

Conducted validation tests showed that the adhesion strength of the formulation of the prototype is unstable and are not identical in respect to the various stephenmcaramenico state of the metal surface of the substrate. At small depths uniform corrosion with roughness less than 0.1 mm and no pitting caverns strength adhesive clutch is really very high, which fully confirms the data of the prototype. However, in relation to a clean metal surface, i.e. in the complete absence of corrosion manifestations, the adhesive strength of the coupling is greatly reduced to 3 points. In the case of deeper uniform corrosion with a roughness of more than 0.5 mm, or in the case of pitting corrosion strength of adhesion of such dvuhpilonnogo coverage of the prototype are small and are at level 2 or 3 points.

This, at first glance, contradictory picture related to the processes of physical-chemical interaction at the boundaries:

1. Metal - corrosion layer on the metal surface.

2. The outer layer of the corrosion surface primer sodium silicate glass.

3. Clean metal surface - to-surface primer sodium silicate glass in the form of 10 wt.%-aqueous solution.

Analyze all of the three cases on the example of iron.

1. Metal - corrosion layer on the metal surface.

It is known that the process of uniform corrosion starts from the metal surface and flows in the presence of moisture and oxygen. As a result, the atoms of W which will be gradually transformed into oxides. The original is incomplete oxidation of the surface iron atoms with the formation of hydroxide fragments, which retain their nuclear relationship with not entered in the corrosion process, the atoms of the deeper layers of iron. Therefore, the primary thin oxide-hydroxide surface is quite durable.

2. Outer anti-corrosion surface - to-surface primer sodium silicate glass.

During processing, according to the prototype, thin outer anti-corrosion surface coating in the form of 10 wt.%-aqueous liquid sodium glass is a chemical interaction between corrosion oxide hydroxide outer surface and macromolecules sodium glass with the formation of a fairly strong chemical bonds:

Therefore, when processing thin corrosion of the surface of the liquid glass is the strong coupling between a thin corrosion surface and hardened glass. The subsequent application of the front layer silicate paints on primed with liquid glass surface ensures high durability coatings due to their chemical affinity.

At a deeper corrosion of the outer surface of the oxide-hydroxide layers are transformed into iron oxide (III) and the strength of adhesion to metal with increasing distance the I layers of rust from the base metal gradually and steadily weaken:

For this reason, the application of silicate primer on the metal surface exposed deep as uniform and pitting corrosion, does not provide the strength of the coating. In this case, only removing rusty layer to a depth less than 0.1 mm can significantly increase the strength of the coating.

3. Clean metal surface - to-surface primer sodium silicate glass.

As shown by the test, when applied to a clean metal surface primer 10 wt.%-aqueous solution of sodium silicate glass, with subsequent drying, there is a partial peeling of the dried silicate layer. The reason for this phenomenon is, on the one hand, in the antagonism of hydrophobic metal surface, and on the other hand, in a moderate hydrophilicity of silica glass. Therefore, when the coating solution of silicate glass is low wetting ability of the surface of the pure metal, and when drying (hardening) of silicate glass has a high interfacial tension at the boundary of the metal surface - hardened glass. The result of these 2 reasons is the reduction of intermolecular interaction, which leads to lowering of strength of adhesion and the strength of the primer.

All this is the cause of the faults about which of atipa:

- low degree of adhesion strength with respect to both clean metal surface, and in the presence of the metal surface corrosion depth of more than 0.1 mm uniform and/or pitting;

low adaptability in practice, because dvuhyakornoe coverage in respect of processability inferior tropicabana the floor.

The problem solved by the claimed invention, is to create a composition of the protective and decorative silicate coatings for metal exterior and interior surfaces, free from the disadvantages of the prototype.

The technical result achieved by the present invention is to provide a high adhesion strength between odnoupakovochnye coating and the metal surface is not as susceptible to corrosion, and is exposed to various degrees of corrosion.

Additional technical result - under cover high quality on all other indicators: first of all, water resistance, no coating, anti-corrosion properties and frost resistance.

The problem is solved by introducing a known composition of protective and decorative silicate coatings containing liquid silicate glass and aluminum powder, the following components: surfactant solopol trangleball, chalk technical fine with a particle size of not more than 10 μm, latex, paliggenesia siloxanes, the following ratios, wt%:

Glass silicate potassium24-25
Chalk technical fine9-10
Pigment20-21
The aluminum powder4-5
Surfactant
(sulfopropyl)7-7,5
Latex17-17,5
The siloxane polyalanine8-9
Waterrest

Surfactant sulfopropyl promotes the formation of an adsorption layer on the boundary surface of the metal silicate coating". As a result of this reduced interfacial tension and improve wetting ability, which increases the strength of adhesion. During solidification of the coating, due to the low interfacial surface tension forces maim the molecular attraction is manifested largely what provides the strength of the coating to the metal.

Chalk technical fine introduced into the composition as a solid filler, which plays a reinforcing role. The chalk particles not larger than 10 μm have a high surface energy, which allows us to provide not only the strength of the coating, but that is also very important, no coating. Only in the case of chalk particles larger than 10 microns symptoms coating.

The pigments are introduced to make color also play a role of active filler.

Latex acts as a binder, and reduces the degree of coating.

Paliggenesia siloxanes give a water-repellent hydrophobic properties of the silica coating, on the one hand, and, on the other hand, have a chemical affinity to the silica glass, i.e., increase the water resistance of the coating and the adhesion of the coating to the metal.

Examples of carrying out the invention

1. Protective and decorative coating of red color was made of a composition containing, in wt.%:

Glass, potassium silicate production
JSC "Russian magnesium" with the value
silicate module 3,95 24
Chalk technical fine
(particle size 1-2 microns)9
The pigment is iron oxide +320
The aluminum powder5
Surfactant
(sulfopropyl)7
Gramos-A - aqueous dispersion of a copolymer
styrene and esters of acrylic acid17
Polymethylsiloxane PMS-4008
Waterrest

2. Protective and decorative coating of lemon-yellow color was made of a composition containing, in wt.%:

Glass, potassium silicate production
JSC "Russian magnesium" with the value
silicate module 3,9524
Chalk technical fine
(particle size 1-2 microns)10
Pigment - chromate strontium21
The aluminum powder5
Surfactant
(sulfopropyl)7
BMP-SL - (meth)acrylic copolymerof 17.5
Polyethylsiloxane (PES)9
Waterrest

3. Protective and decorative coating of gray-greenish color was made of a composition containing, in wt.%:

Glass, potassium silicate production
JSC "Russian magnesium" with the value
silicate module 3,9525
Chalk technical fine
(particle size 1-2 microns)10
Pigment - phosphate chromium20
The aluminum powder4
Surfactant
(sulfopropyl)7,5
BMP-SL - (meth)acrylic copolymer17
Polymethylsiloxane PMS-3008
Waterrest

Trial offer odnoupakovochnye protective and decorative silicate coatings were carried out in accordance with the requirements of the respective Standards.

As can be seen from the table, where the descriptions of the properties of the proposed invention in relation to metal surfaces in comparison with the same characteristics of coating properties on the prototype, there is a significant difference in the main index of the adhesion strength. Thus, the adhesion strength of the proposed structure to the pure metal is superior to the prototype 3 times, to metal, coated with corrosion to a depth of from 0.1 mm to 1.5 mm, exceeds the prototype in 2 times, and the metal coated with the significant corrosion to a depth of more than 1.5 mm, 1.5 times.

Tests for resistance in the course of 3 months have shown that continuity of protective and decorative silicate coating of the proposed structure was not violated, while the coverage of the prototype continuity was broken. A slight coating of the proposed coating was observed only in the case of use on metal, covered with significant corrosion to a depth of more than 0.5 mm, the present invention Also 2 times higher than the floor of the prototype in relation to frost resistance as in the pure metal and metal corrosion to a depth of up to 0.5 mm shelf Life of the proposed structure without changing its properties for at least one year.

Thus, the task of creating a composition odnoupakovochnye protective and decorative silicate coating, providing a high adhesive strength to the metal surface as it is not susceptible to corrosion, and is exposed to various corrosion is achieved.

Protective and decorative silicate coating made from the composition containing liquid silicate glass and aluminum powder, characterized in that it further contains a surface-active substance sulfopropyl, chalk technical fine with a particle size of not more than 10 μm, latex and paliggenesia with lexani in the following proportions, wt.%:

Glass silicate potassium24-25
Chalk technical fine9-10
Pigment20-21
The aluminum powder4-5
Surfactant (sulfopropyl)7-7,5
Latex17-17,5
The siloxane polyalanine8-9
WaterRest



 

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