BG65946B1 - Compositions for interior, facade and air-purifying silicate paints - Google Patents

Abstract

The paints are designed for painting of buildings, building structures, tunnels, swimming pools and other projects. The coating produced is long lasting, water impermeable, light resistant and possesses photocatalytic effect, purifying the atmospheric air from its basic pollutants: nitrogen and sulphur oxides, dioxides and others. Sodium silicate is used as film-forming substance in the form of water glass, and different modifications of TiO2 are used as basic pigment under the effect of ultra violet radiation (natural or artificial), and part of the spectrum of the visible light is activatedand exhibits photocatalytic effect. The type and the quantity of the different fillers and additives have been selected depending on what the paint is meant for. The paints are easily applied and arefully harmless, showing bactericidal and fungicidal effect. They are self-purifying by means of the so-called noble whiting, but, if necessary, they can be washed with water. Water is used when they are used as a solvent and a cleaning means.

Description

Technical field

The invention relates to a composition for protective and decorative coatings - interior, facade, air-purifying paints, varnishes, screeds, in which the use of sodium silicate in the form of sodium water glass is used as a film-forming substance, and various crystallographic materials are used as the main pigment and photocatalyst. modifications of titanium dioxide.

BACKGROUND OF THE INVENTION

Silicate interior and facade paints are known, which, according to European and American technical literature, retain their protective and decorative qualities for decades. Silicate paint coatings are highly weather resistant. Resistant to heat, moisture, ultraviolet radiation, ozone, acids and other aggressive agents. They have high strengths, good air and vapor permeability, flame retardant properties and are environmentally friendly. They are also characterized by a slight dusting. These specific properties of silicate paints make them particularly suitable for painting buildings (plastering, concrete, stone and other cladding).

In Bulgaria, Germany, Russia as well as in EP 1559753 A2 silicate paints are produced based on potassium water glass with module 3,4-4 and density 1.15-1.35 g / cm ³ .

The disadvantage of silicate paints based on potassium water glass is the high value and scarcity of raw materials.

Only potassium water glass K ₂ OnSiO ₂ .mH ₂ O (n> 3, m = 3-5) is considered suitable for the production of silicate paints. The sodium waterglass Na2O.nSiO2.mH2O not used because at the polycondensation processes in the hardening in the presence of CO ₂ in the atmosphere to form Na ₂ CO _3, distorts the structure of the film and form was there spots on its surface, which greatly degrades the decorative qualities of the coating.

This disadvantage is not avoided in the well-known Copyright Certificate SU1502589 A1 for silicate paint with sodium water glass and zinc bleach.

Also known is a patent for protective decorative coating BG 62621 B1 based on sodium or potassium silicate, the composition of which does not provide good roofing ability, the necessary decorative qualities and antibacterial properties, since it does not contain titanium dioxide,

The object of the invention is to provide a composition for silicate dyes based on sodium water glass, which prevents the formation of sodium carbonate and eliminates the harmful effects of this by connecting the sodium ions of the water glass in other compounds or structures and making it possible to use sodium water glass as a film-forming substance in silicate coatings with high mechanical, protective and decorative properties. The film formed must be breathable, transparent and UV resistant and possess photocatalytic properties, providing antibacterial action and purification of the air from harmful pollutants.

SUMMARY OF THE INVENTION

The object of the invention is solved by the creation of a composition for interior, facade and air purifying silicate paint based on sodium water glass containing the following components:

LA. Binder (film-forming agent) - Sodium water glass module 1.5-3, m = 3.5-6, density 1.15-1.5 g / cm ³ in the amount of 40-70% by weight of paint

II. Dry components

B. Fillers

1. Zeolites - skeletal aluminosilicates with a cation exchange capacity of at least 100 mg eqv / 100 g, in an amount of 2-10% by weight of the dry components. Zeolitige adsorbs sodium cations from water glass, balancing the negative charge of the zeolite structure and improving the film's elasticity.

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2. Bentonite (montmorillonite) - a finely ground natural product that improves the rheological structure of silicate paints and imparts them textotropic and anti-sedative stabilizing properties. Add in the amount of 2-6% by weight of the dry components. It can be replaced with Bentone - a finely ground natural bentonite, additionally aminated.

3. Aluminum hydroxide A1 (OH) ₃ in an amount of 5-10% by weight of the dry components. Performs several functions:

- to bind the sodium ions of the water glass in the form of sodium aluminates having hydrophobic properties;

- to form zeolites with water glass to absorb sodium ions. The role of a zeolite collector is fulfilled by bentonite;

- flame retardant. When heated above 180 ° C, it undergoes another crystalline modification, releasing 35% of its mass in the form of water vapor.

4. Boric acid in an amount of 0.2-5% by weight of the dry ingredients. This component, when reacted with water glass, forms sodium tetraborate (borax). Borax acts as a highly swollen flame retardant.

5. Benzoic acid in an amount of 0.050.3%. When interacted with water glass, it forms an antiseptic that improves adhesion, gloss, hardness and chemical resistance of the coating.

The fillers 1 to 5 alone or in combination allow the formation of sodium carbonate to be prevented by the solidification and film formation of the sodium water glass.

6. Talc (magnesium hydrosilicate). A white talc with a whiteness of 92-97% was used, with a refractive index of P = 1.58 and a particle size of 10-20 micrometer. Due to its specific particle shape, it has a reinforcing effect on the coating, increasing its hydrophobicity and weather resistance. Its amount is from 10 to 25% by weight of the dry ingredients.

7. Magnesium carbonate (magnesite). Fine-ground natural magnesite of white color n _D = 1,51,7. Improves the ability of the silicate paint to be applied with a brush. Its amount is 10-15% of the dry components.

8. Barium sulphate (barite). White barite n _D = 1,64 with a particle size distribution of 10-30 micrometer in an amount of 5-10% by weight of the dry ingredients is used. Can be replaced with artificially produced blank form.

9. Fluoride - a finely ground mineral with a minimum content of CaF _{2 of} 80%. It transmits UV light and promotes the photocatalytic action of titanium dioxide. Its amount is 10-15% by weight of the dry ingredients. It can be replaced with finely ground MgF ₂ or alpha quartz.

C. Pigments

1. Titanium dioxide - the main pigment in the developed silicate paints. It is insoluble in water. It is chemically inert - it exists in the form of two crystallographic modifications - rutile (R) and anatase (A). Both modifications have a very high light refractive index, for rutile Pr = 2.7-2.9, and for anatase - 2.55. Both modifications are used as pigments in the formulations formulated, containing 40-60% by weight of the dry components.

Titanium dioxide is a chemically stable compound, but its titanium atom is coordinatively unsaturated and can firmly attach two water molecules to form a peroxide group in the form of a tense triangular ring. Under the influence of ultraviolet rays, this ring is easily destroyed by releasing ozone and oxygen. In organic film-based paints and titanium dioxide pigments, this phenomenon is the main cause of their oxidation, cracking and destruction. The film of silicate paints is extremely strong - difficult to oxidize and destroy by oxygen and ozone. Routine crystallographic modification of titanium dioxide is less likely to form peroxide groups than anatase.

2. Zinc oxide - an artificial mineral pigment. Depending on the production conditions, particles of size 0.1 to 0.5 micrometer in various shape can be obtained. Zinc reflection coefficient

65946 B1 oxide is 99.7%, a = 1.9-2.01. Quantity from 5 to 15% by weight of the dry components.

3. Colors - alkaline-resistant pigments in an amount of 3 to 10% by weight of dry ingredients.

D. Modifiers

1. Methylcellulose - a surfactant in the amount of 0.2-1% by weight of dry ingredients.

2. Dwanadium pentoxide in an amount of 0.1-0.5% by weight of the dry components.

3. Biphosphorus pentoxide in an amount of 0.1-0.5% by weight of the dry components.

4. Linseed or tungsten or other vegetable oil in the amount of 3-5% of the amount of water glass.

5. Hydrophobizers - metal soaps of fatty acids in the amount of 0.1-1% by weight of the dry components.

6. Hardeners - Winerweiss, silica in the form of finely ground quartz sand or aerosil, magnesium phosphate. The type and amount of hardeners depend on the paint requirements.

From the above components, a composition has been created for three types of silicate paints with a film-forming substance - sodium water glass, depending on the specifics of their use.

Composition for interior silicate paint, including film-forming substance, titanium dioxide, modifiers and all fillers 1 to 8, providing high decorative qualities of the paint coating.

Composition for silicate facade paint including film-forming material, titanium dioxide, zinc oxide, fillers 1 to 3, talc, magnesium carbonate, modifiers 1 to 3, hydrophobizer, quartz 5-15%, vinervase 2-15% and magnesium phosphate 1 -5%.

Air purifying composition comprising film-forming substance, titanium dioxide, fillers 1 to 3, modifiers 1 to 3, hydrophobizer, quartz 5-15%, calcium or magnesium fluoride 10-15%, ultraviolet light transmitters and auxiliary radiation beams and titanium dioxide. The crystalline modification of TiO ₂ in this paint is anatase.

The advantages of the invented compositions for silicate paints are the following:

- replacement of expensive and deficient potassium water glass with sodium water glass;

- they are not inferior in quality to the coatings made from potassium water glass based paints, but superior in adhesion and absence of internal stresses;

- have high flame retardant properties;

- are UV-resistant and exhibit high photocatalytic activity;

- prevent the appearance of bacteria and molds and eliminate odors in the air, turn into harmful substances the main air pollutants - nitrogen and sulfur oxides and CO.

Examples of carrying out the invention

The invention is illustrated by the following examples:

1. Composition for interior silicate paint in%:

TU ₂ -30

MgCO ₃ -24

A1 (OH) ₃ -8

Talc - 22

Bentonite-4

BaSO-5

Zeolite - 5

H ₃ IN ₃ -0.8

C6H5SOUN-OD ν ₂ ο ₅ -ο, ι р ₂ о ₅ -о, 1

Methylcellulose - 0.9

Linseed oil - 3% of water glass

Sodium water glass - 58

2. A composition for facade silicate paint in%: TiO ₂ -18

MgCO ₃ -18

A1 (OH) ₃ -6

Talc - 18

Bentonite-4

Ocher - 7.5

ZnO - 5%

Wienerweiss - 5

Zeolite - 6

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SiO ₂ -14

V ₂ O ₅ -0, l P ₂ O ₅ -0, l Mg ^ PO ^ -l Methylcellulose - 0.8 Sodium water glass - 61

3. Composition for air purification silicate paint in%:

TiO ₂ -48.5

SiO ₂ -18 A1 (OH) ₃ -5 Bentonite-3 Zeolite - 7 Fluoride - 13 Vinerweiss - 4 V ₂ O ₅ -0, l P ₂ O ₅ -0,1 Methylcellulose - 0,8 Sodium water glass - 67

Claims (3)

A composition for the production of interior, facade and air-purifying silicate paints based on water glass, fillers, pigments, hardeners and modifying additives, characterized in that when the paint is interior water glass is sodium with a silicate module of 1.5-3, in the amount of 40-70% by weight of the finished mixture, also containing fillers: zeolite, in the amount of 2-10% by weight of the dry components, bentonite, in the amount of 2-6% by weight of the dry components, aluminum hydroxide in the amount of 5 -10% by weight of dry components, boric acid in colic 0.52% by weight of the dry components, benzoic acid, in the amount of 0.05-0.3% by weight of the dry components, talc, in the amount of 10-25% by weight of the dry components, magnesium carbonate in the amount of 10- 25% by weight of the dry components, barium sulfate in the amount of 5-10% by weight of the dry components, pigments: titanium dioxide in the amount of 20-60% by weight of the dry components; colorants - alkali-resistant pigments in the amount of 3-10% by weight of the dry components, modifiers: methylcellulose in the amount of 0.2-1% by weight of the dry components; duodenal pentoxide in an amount of 0.1-0.5% by weight of the dry components; two phosphorus pentoxide in an amount of 0.1 -0.5% by weight of the dry components; linseed, tungsten or other vegetable oil in the amount of 3-5% of the amount of water glass. 2. Composition for the production of interior, facade and air purifying silicate paints based on water glass, fillers, pigments, hardeners and modifying additives, characterized in that, when the facade is painted, the water glass is sodium with a silicate module of 1.5-3. , in the amount of 40-70% by weight of the finished mixture, also containing fillers: zeolite, in the amount of 2-10% by weight of the dry components, bentonite, in the amount of 2-6% by weight of the dry components, aluminum hydroxide in the amount 5-10% by weight of dry components, benzoic acid, in bulk 0.05-0.3% by weight of the dry components, talc, in the amount of 10-25% by weight of the dry components, magnesium carbonate in the amount of 10-25% by weight of the dry components, pigments: titanium dioxide in the amount of 20 -60% by weight of dry components; colorants - alkali-resistant pigments in the amount of 3-10% by weight of the dry components, modifiers: methylcellulose in the amount of 0.2-1% by weight of the dry components; duodenal pentoxide in an amount of 0.1-0.5% by weight of the dry components; biphosphorus pentoxide in an amount of 0.1 -0.5% by weight of the dry components; zinc oxide in the amount of 5-15%, quartz in the amount of 5-15%, vinervase in the amount of 2-15% and magnesium phosphate in the amount of 1-5%. 3. A composition for the production of interior, facade and air-purifying silicate paints based on water glass, fillers, pigments, hardeners and modifying additives, characterized in that when the paint is air-purifying the water glass is sodium with a silicate module of 1.5-3, in the amount of 40-70% by weight of the finished mixture, also containing fillers: zeolite, in the amount of 2-10% by weight of the dry components, bentonite, in the amount of 2-6% by weight of the dry components, aluminum hydroxide in the amount of 5 -10% by weight of dry components, pigments: titanium in Dioxide - analysis in an amount of 20-60% by weight of the dry components; dyes - alkaline resistant pigments in the amount of 3-10% by weight 65946 B1 dry components, modifiers: methylcellulose in an amount of 0.2-1% by weight of the dry components; duodenal pentoxide in an amount of 0.1-0.5% by weight of the dry components; two phosphorus pentoxide in an amount of 0.1-0.5% by weight of the dry components; quartz in the amount of 5-15%, fluoride in the amount of 10-15%, vinervase in the amount of 1-5%.