RU2296147C2 - Protective-decorative paint - Google Patents

Abstract

FIELD: chemical technology, in particular paint composition based on alkyd resin useful in production of protective-decorative covers for wood and metal.

SUBSTANCE: claimed protective-decorative paint includes film-forming agent based on alkyd resin, pigment, drying accelerator, and solvent. As pigment paint contains white pigment such as titania and colored pigment such as wolchonskoit mineral powder.

EFFECT: environmentally friendly paint with good appearance, high adhesion to surfaces and protective effects.

2 tbl, 2 ex

Description

The invention relates to chemical technology, in particular to the composition of paints based on alkyd resin used for protective and decorative coatings for wood and metal.

It is known that improving the quality of alkyd enamels of various colors, optimizing the pigment composition, improving the technology of their production while ensuring the highest quality of enamels is possible using one pigment, for example, based on sulfides of a number of metals Zn, Cd, etc. and mixtures of sulfides with selenides. Most of them are not used for internal work due to sanitary and hygienic restrictions. But artists use these paints because of their high decorative properties: preserving the color tone when the paint layer dries, which is especially appreciated.

The nature of the adhesive interaction of the ink film with the substrate depends on the activity of the pigment surface, the protective properties of the ink film depend on the properties of the film former - pigment system, and in its pure form alkyd films have low moisture resistance, which does not prevent corrosion of the metal substrate and leads to deformation of moisture-sensitive substrates such as wood, cardboard, chipboard.

It is known that the use of natural and synthetic aluminosilicates in paints and varnishes prevents sedimentation of titanium dioxide and delamination in two pigment enamels and primers due to the specific interaction between the functional groups of alkyd resins and the surface of aluminosilicate particles, in particular aluminum atoms. Moreover, adsorption proceeds irreversibly and increases with increasing temperature and is associated with the acid-base interaction and with the amphoteric nature of aluminum.

It is known that the use of a natural mineral based on iron oxide (ocher and derivatives thereof) as a pigment allows one to naturally significantly improve the anticorrosion properties of paint coatings and their characteristics under conditions of artificial aging, and increase adhesion and resistance to environmental influences. The disadvantage of natural pigments based on iron oxide is the limited palette of single-pigment paints based on them.

It is known that most protective and decorative enamels are made on mixtures where the white pigment is mixed with color (two or three) to ensure compliance with the standard color tone, when choosing color pigments take into account the need to ensure appropriate light fastness of the enamel.

The disadvantage of the pigment mixture is that they interact differently with the film former under storage conditions before use and in the paintwork during operation and exposure to external environmental factors.

Typically, a mixture called tinting is applied immediately before using the paint. Possible tinting options: black enamel and white enamel or black enamel, white enamel and three colored enamels. However, the mixing of several colors, for example, yellow and blue-blue tones, does not provide a constant color tone of the coating film during operation. This is a significant drawback of multi-color paints, especially for artistic writing or painting.

In decorative paints made on a mono-pigment basis, for example, in paints based on spinel, there is no emission of harmful factors, but these paints do not have a color tone intensity in comparison with sulfides and mixtures of sulfides with selenides.

Paints based on sulfides and mixtures of sulfides with selenides are mainly used for outdoor applications. But, sometimes they are used on interior finishes because of the high decorative properties, which preserve the color tones of the film of these paints.

The well-known "Protective and decorative paint" (RU patent No. 798149, priority date 06.03.78, the applicant "Belgorod Technological Institute of Building Materials"). The paint contains drying oil, zinc white, barite, ultramarine, hydrophobic chalk. The disadvantage of paint is the low protective and decorative properties of the paint.

In connection with the advent of new technologies in industry, construction and the formation of modern aesthetic tastes, consumers are faced with increasingly stringent requirements for paints and varnishes, especially for the protective and decorative properties of paints. The properties of the paint are determined to a greater extent by the film-forming substance and pigment. For example, paints in which the binder is an alkyd resin create a durable film suitable for use on virtually any surface. Such coatings have a transparent or translucent (color) film. Composition for coating on alkyd binders, resin or varnish, used in organic paints, is easy to apply, high weather resistance. Adkyd binders dry quickly, do not shrink when dry, do not turn yellow and have a glossy finish. Such compositions are used to protect against wear and corrosion of various surfaces both inside and outside the building. The coating composition can withstand wet cleaning with water using conventional detergents.

An analogue of the declared protective and decorative paint is a pentaphthalic enamel obtained in a known manner ("Method for producing pentaphthalic enamels", RU Patent No. 2142484 C1 dated 12.12.1999, applicant Kuzmina VP), including a film-forming agent based on alkyd resin - pentaphthalic varnish PF 060 , pigment, drying accelerator (desiccant ZhK-2 or 64P) and solvent (white alcohol). This analogue is the closest in purpose and combination of essential features and therefore is taken as a prototype of the invention. The disadvantage of the prototype is the limited decorative properties of the paint.

An object of the invention is to increase the protective properties and improve the decorative effect of a protective decorative paint.

The solution to the technical problem is achieved by the fact that the protective and decorative paint, including a film-forming agent based on alkyd resin, a pigment, a drying accelerator and a solvent containing white pigment as a pigment — titanium dioxide and color pigment — Volkonskoite mineral powder in the following ratio of components, wt.% :

specified film-forming 32-69 drying accelerator - desiccant 0.1-0.5 titanium dioxide 0.1-0.5 wolfconcoite 8-25 solvent rest.

In the declared protective and decorative paint, as a film-forming agent based on alkyd resin, for example, pentaphthalic varnish PF-060 or alkyd varnish GF-177 is used.

Protective and decorative paint, made, for example, on pentaphthalic varnish PF-060, is intended for coating parquet floors for applying internal and external coatings for metal and wood. This paint forms a strong and wear-resistant coating (see example 1).

Protective and decorative paint made on GF-177 alkyd varnish is intended for coating wooden, primed or painted metal surfaces operated in external atmospheric conditions. Kitchen furniture is also painted with this paint (see example 2).

In the claimed composition of the protective and decorative paint, to increase the protective properties of the paint, titanium dioxide (Ti ₂ O) is used as a white pigment. Titanium dioxide has photocatalysis properties, accelerating the splitting of water vapor by ultraviolet light, while hydroxyl radicals appear, easily washed off by rain, due to which the claimed paint acquires high water-repellent properties. Also, titanium dioxide has high refractive properties, particles of titanium dioxide participate in light scattering, refracting light, which helps to preserve the decorative properties of the paint coating.

In the composition of the declared protective and decorative paint, a mineral of fine Volkonskoite powder is added as a color pigment. Volkonskoit provides a naturally matte surface, which improves the decorative effect of protective decorative paint, which has a pleasant silky sheen. The use of Volkonskoite as a protective and decorative paint allows to increase the protective properties of the paint: to increase the moisture resistance and strength of the alkyd film, as well as to increase the adhesion of the paint to the metal substrate.

Volkonskoite is a rare mineral, which is clay, impregnated with dichromium trioxide Cr 203 (up to 30 wt.%). Deposits of this mineral are known only in Russia. Volkonskoite is formed as a result of the interaction of groundwater enriched in chromium with organic matter (with bends and tree fragments buried in coarse material). As a result of this interaction, chromium compounds are restored, forming together with iron, silica and alumina dissolved in water, Volkonskoite, which has a beautiful green color in various shades, from light green to dark green. But sometimes there are brown and black colors. The chemical mineral is stable, opaque, has a shimmering shine, greasy to the touch.

The composition of the declared protective and decorative paint used a drying accelerator selected from a number of desiccants, which include metal compounds (mainly lead, manganese, cobalt, calcium, iron) with organic acids. These can be, for example, salts of naphthenic organic acids, the so-called naphthenates, but linseed oil acid — linoleates, rosin resin — resins, etc. can be used. These salts dissolve well and have a positive effect on reducing the duration of film formation on a painted surface. In the declared protective and decorative paint, a drier (Mn6) of the RADUGA-1 brand or (Mn3Zn17) of the RADUGA-2 brand is used.

The composition of the declared protective and decorative paint includes a solvent, for example, white spirit or solvent.

A method of obtaining a protective and decorative paint is the dispersion of powdered Volkonskoite and additives in the varnish medium in a known manner in bead mills to the necessary degree of grinding according to the device "Wedge". Tests of the claimed protective and decorative paint were carried out at the boundary and average values of the content of the components shown in table 1.

Table 1. Component The recipe, wt.% one 2 3 film forming 32 50,5 69 desiccants 0.1 0.3 0.5 Titanium dioxide 0.1 0.3 0.5 Volkonskoit 8 16.5 25 White Spirit Rest rest rest

Example 1

As the film-forming pentaphthalic varnish PF-60 was selected. The test data are shown in table 2 in comparison with oil paint GOST10503-71 MA-15

Table 2. The name of indicators MA-15 The value of the indicators of the samples one 2 3 Mass fraction of non-volatiles 60 81 77 78 Conditional viscosity on the B3-4 viscometer (nozzle 4 mm), at 20 ° C 96 120 95 82 The degree of grinding, microns, not more - twenty 35 35 Spreading rate in terms of raw film, (g / m ² , not more) 200 one hundred 110 114 Drying time to degree 3 At 20 ° С (hour, no more) 22 6 6 6

Hardness according to the pendulum device TML, (y.e., not less) 0.14 0.12 0.5 0.9 Adhesion, kgf / cm ² - 121 125 130

Example 2

As a film-forming alkyd varnish GF-177 was selected.

The test data are shown in table 2 in comparison with oil paint grade GOST10503-71 MA-15.

table 2 The name of indicators MA-15 The value of the indicators of the samples one 2 3 Mass fraction of non-volatiles 60 81 52 78 Conditional viscosity on the B3-4 viscometer (nozzle 4 mm), at 20 ° C 96 thirty 95 fifty The degree of grinding, microns, not more - twenty 35 35 Spreading rate in terms of raw film (g / m ² , not more) 200 one hundred 110 114 Drying time to degree 3 At 20 ° С (hour, no more) 22 6 four 6 TML pendulum hardness (y.e., not less) 0.14 0.12 0.5 0.9 Adhesion, kgf / cm ² - 121 125 125

In all tests, the protective and decorative paint, which contains titanium dioxide with Volkonskoite, does not lose its good appearance, adhesion to the surface and protects the latter from the damaging effects of water and other atmospheric factors.

The proposed protective and decorative paint based on alkyd film-forming, which includes Volkonskoite, due to its natural origin, the studied chemical properties does not emit harmful substances into the environment during the operation of the paintwork. The declared paint allows to obtain coatings with good physical and mechanical properties, high adhesion and abrasion resistance, as well as a good color gamut and can be used in art painting for exterior and interior use, for protective and decorative coatings of metal with an upper operating temperature limit of 150 ° C.

Claims (1)

Protective and decorative paint, including a film-forming agent based on alkyd resin, a pigment, a drying accelerator and a solvent that contains white pigment as a pigment — titanium dioxide and color pigment — Volkonskoite mineral powder in the following ratio, wt.%: The specified film-forming 32-69 Drying accelerator 0.1-0.5 Titanium dioxide 0.1-0.5 Volkonskoit 8-25 Solvent Rest