RU2716448C1 - Fire-retardant intumescent paint with increased limit of fire resistance - Google Patents

Abstract

FIELD: paint industry.

SUBSTANCE: invention relates to paint materials intended for protection of various metal structures, structures and materials, and can be used in construction industry, transport and in other areas where protection of surfaces from fire is required. Composition including vinyl chloride copolymer VKhVD 40 or copolymer of vinyl chloride with vinyl acetate, alkyd varnish semi-finished PF-053 or analogues, resin alkyd Resial 030, copolymer Acrylon, intumescent additives: chlorinated paraffin wax KhP-470, ammonium polyphosphate, micronised pentaerythritol, melamine; thixotropic additive, titanium dioxide pigment P and organic solvents: butyl acetate, white spirit and toluene and applied by airless or combined spraying, forms a fire-retardant intumescent coating with an increased fire-resistance limit of up to 150 minutes, can be applied at negative temperatures (up to -15 °C) with preservation of decorative properties and formation of spray thickness in 1 pass to thickness of 1.5–2 mm.

EFFECT: disclosed is fire-retardant intumescent paint with increased fire resistance.

1 cl, 4 tbl

Description

The invention relates to paints and varnishes intended for the protection of various metal structures, structures and materials, and can be used in the construction industry, transport and in other areas where surface protection against fire is required.

Most of the well-known flame retardant intumescent paints, for example: Pat. US 3658579A, US 6642284B2, US 3969291 A, RU 2492201, US 20060041042, RU 2244727, RU 2521060, RU 2313550, RU 2225423 and others, contain three components, due to which expansion is achieved:

источник углерода (пентаэритрит);

carbon source (pentaerythritol);

порофор (меламин и хлор парафин);

porophore (melamine and chlorine paraffin);

источник неорганической кислоты-катализатора (полифосфат аммония).

source of inorganic acid catalyst (ammonium polyphosphate).

When a fire retardant coating is exposed to heat, a cascade of reactions starts:

полифосфат аммония разлагается с выделением фосфорной кислоты;

ammonium polyphosphate decomposes with the release of phosphoric acid;

фосфорная кислота вызывает дегидратацию пентаэритрит с образованием углеродного кокса;

phosphoric acid dehydrates pentaerythritol to form carbon coke;

порофор разлагается с выделением негорючих газов, которые вспенивают кокс.

the porophore decomposes with the release of non-combustible gases that foam the coke.

The resulting structure, called penocox, provides highly effective thermal insulation of the painted structure, thereby increasing the time before the loss of the bearing capacity of metal structures or burning begins.

The main goal of creating new intumescent fire retardants is to increase the fire retardant properties of the paint and increase the ability to apply paint of greater thickness in a single pass on vertical surfaces without sagging. This task is achieved through a combination of the above components with various film formers and fillers.

The known composition of the fireproof weatherproof paint is RF patent No. 2666861, taken as the closest analogue to the claimed solution containing a styrene-acrylic copolymer film former, butyl acetate, xylene, white spirit, pentaerythritol, melamine, flame retardant ammonium polyphosphate, flame retardant chlorine paraffin, flame retardant ( 3-dibromopropyl) phosphate, pigments, thickener and wetting agent. The claimed technical advantages of this invention is to increase the fire retardant properties of the paint, expressed in increasing the time the sample reaches the average temperature of 500 ° C to 121-122 min, as well as the possibility of applying paint with a thickness of 0.6 mm in one pass.

The objective of the present invention is to obtain a flame retardant intumescent paint with an increased fire resistance limit (according to 07/22/2008 No. 123-ФЗ) up to 150 minutes (GOST 53295-2009), the possibility of applying at low temperatures (up to -15 ° C) while maintaining decorative properties and obtaining for 1 pass of the spray coating thickness up to 1.5-2 mm.

The technical result is solved by creating a composition comprising film formers: vinyl chloride copolymer VHVD 40 TU 2212-275-05763458-99 or vinyl chloride copolymer with vinyl acetate (GOST 12099-75), semi-finished alkyd varnish PF-053 (TU 6-10-612-76) or analogues, alkyd resin of Resial 030 brand (TU2311-042-56041689-2006), Acrylon copolymer (TU 2216-042-18777143-2013); intumescent additives: chlorine paraffin HP-470 (TU 2493-339-05763458-2003), ammonium polyphosphate (GOST 20291-74), microvised pentaerythritol (TU 2422-038-00203803-2014), melamine (GOST 7579-76); thixotropic additive, pigment titanium dioxide R (GOST 9808-84) and organic solvents: toluene (GOST 14710-78), butyl acetate (GOST 8981-78) and white spirit (GOST 3134-78) in the following ratio of components, wt. % indicated in Table 1:

To obtain the composition, the vinyl chloride copolymer (p. 1) is dissolved in an organic solvent toluene (p. 13) for 0.5 hours at room temperature while stirring with a laboratory stirrer with a speed of 120 rpm. Dissolution quality control - visual, by the absence of undissolved lumps.

To obtain the composition, alkyd resin 030 (item 3) and semi-finished alkyd varnish PF-053 (item 2) are dissolved in a mixture of organic solvents butyl acetate (item 11) and toluene (item 13) with a solvent ratio of 65:35 for 0 , 5 hours at room temperature with stirring with a laboratory stirrer with revolutions of 120 rpm.

To obtain the composition, the acrylon copolymer (p. 4) is dissolved in an organic solvent toluene (p. 1.13) for 0.5 at room temperature while stirring with a laboratory stirrer at 100 rpm. Dissolution quality control - visual, by the absence of undissolved lumps.

The obtained solutions of film-forming agents are mixed and loaded into them: pigment (item 10), chlorine paraffin XP-470 (item 8), ammonium polyphosphate (item 5), micronized pentaerythritol (item 6), melamine (item 7), thixotropic additive (p. 9), pigment titanium dioxide R (p. 10) at various ratios of components presented in Table 2).

The resulting suspensions are thoroughly mixed with a laboratory stirrer and dispersed in a dissolver for 60-80 minutes at 2500 rpm. Quality control of the prepared composition - using a grinder to a milling degree of 70 microns (according to GOST 31973-2013).

The resulting composition is filtered using a polypropylene filter with a pore diameter of 100 μm.

The optimal ratios of the components of fire-retardant intumescent paint with an increased fire resistance indicated in the application are confirmed by the following test data shown in Tables 3-4. The average result obtained by testing at least three parallel samples is taken as the test result.

Coatings from fire retardant intumescent paint compositions with an increased fire resistance limit are obtained on standard steel plates made of 08 KP steel according to GOST 16523-89 and glass 1.2 mm thick. Testing plates correspond to GOST 8832-76 “Methods of obtaining LC coating for testing”. To obtain coatings, the plates are preliminarily prepared according to the following scheme: p. 5.11, scheme 1, Table 6 GOST 9.402-2004 “ESZKS. Preparation of metal surfaces for painting ”(degreasing). Degreasing quality control should be carried out using the drip method in accordance with the procedure in clause 6.4. GOST 9.402-2004.

Fire retardant intumescent paint compositions with an increased fire resistance limit are applied to prepared metal and glass plates in one layer with a thickness of 1500-2000 microns by airless or combined spraying. The coating thickness is controlled using calibrated combs according to GOST R51694-2000 (ISO 2808-97).

The drying of the resulting coating is carried out at (20 ± 2) ° C for 24 hours.

After holding for 16 hours at a temperature of 20 + 3 ° C and a relative humidity of 65 + 10%, the coated plates are passed for testing.

The test results of coatings obtained from fire retardant intumescent paint compositions with an increased fire resistance limit are presented in table No. 4.

From table 4 it can be seen that according to the best criteria for adhesion, hardness, impact strength, appearance when applied at minus 15 ° C and maximum recovery ability, a sample composition with formulation No. 5 is suitable.

Thus, the composition with the formulation No. 5 containing a vinyl chloride copolymer of VHVD 40 TU 2212-275-05763458-99 or a vinyl chloride copolymer with vinyl acetate (GOST 12099-75) in an amount of 6 wt. %, semi-finished alkyd varnish PF-053 (TU 6-10-612-76) or analogues in an amount of 5 wt. %, alkyd resin brand Resial 030 (TU2311-042-56041689-2006) in an amount of 5 ± 0.5 wt. %, Acrylon copolymer (TU 2216-042-18777143-2013) in an amount of 0.9 ± 0.5 wt. %; intumescent additives: chlorine paraffin HP-470 (TU 2493-339-05763458-2003) in an amount of 4.5 ± 0.5 wt. %, ammonium polyphosphate (GOST 20291-74) in an amount of 23 ± 0.5 wt. %, micronized pentaerythritol (TU 2422-038-00203803-2014) in an amount of 8 ± 0.5 wt. %, melamine (GOST 7579-76) in an amount of 10 ± 0.5 wt. %; thixotropic additive in an amount of 0.7 ± 0.1 wt. %, titanium dioxide pigment P (GOST 9808-84) in an amount of 8 ± 0.5 wt. % and organic solvents: butyl acetate (GOST 8981-78) in an amount of 6 ± 0.5 wt. % white spirit (GOST 3134-78) in an amount of 1 ± 0.1 wt. %, toluene (GOST 14710-78) - the rest is up to 100, it is fire retardant, intumescent paint with an increased fire resistance limit (as of July 22, 2008 No. 123-ФЗ) up to 150 minutes (GOST 53295-2009), which can be applied at low temperatures (up to - 15 ° С) with preservation of decorative properties, forms in 1 pass of the sprayer a coating thickness of up to 1.5-2 mm.

Claims (2)

Flame retardant intumescent paint with an increased fire resistance limit, applied by airless or combined spraying, including: vinyl chloride copolymer VHVD 40 or vinyl chloride copolymer with vinyl acetate, semi-finished alkyd varnish PF-053, alkyd resin Resial 030, copolymer acrylic polymer: KP-470, ammonium polyphosphate, micronized pentaerythritol, melamine, thixotropic additive, titanium dioxide pigment P and organic solvents: toluene, butyl acetate and white spirit at further short ratio of the components in the formulation, by weight. % Vinyl chloride vinyl chloride copolymer VHVD 40 or a copolymer of vinyl chloride with vinyl acetate            5.9-6.1 Semi-finished alkyd varnish PF-053                                   4.9–5.1 Alkyd resin Resial 030                                               4,5–5,5 Copolymer Acrylon                                                                       0.4–1.4 Ammonium polyphosphate                                                       22.5-23.5 Micronized Pentaerythritol                                   7.5-8.5 Melamine                                                                                 9.5-10.5 Chloroparaffin brand HP-470                                                      4–5 Thixotropic supplement                                                            0.6–08 Pigment titanium dioxide P                                                            7.5-8.5 Butyl acetate                                                                                    5.5-6.5 White Spirit                                                                                    0.9–1.1 Toluene                                                                                  the rest is up to 100