RU2225423C1 - Fire-proof swelling paint - Google Patents

Abstract

FIELD: varnish-and-paint industry. SUBSTANCE: paint suitable, for instance, for use in construction contains non-plasticized polymer dispersion of acrylic copolymer with vinyl versatate, melamine, pentarythritol, low-molecular acrylic dispersion, sodium carboxymethylcellulose, isothazolone derivatives, titanium dioxide, ammonium polyphosphate, foam suppressor, 2,3,4-trimethyl-1,3-pentadiol monoisobutyrate, butyl cellosolve, plasticizer, sodium polyphosphate, and water. Paint may further contain silica powder. All components are taken in specified proportions. EFFECT: increased water resistance and fire-proofness. 2 cl, 2 tbl, 5 ex

Description

 The invention relates to paints and varnishes, in particular to fire-retardant aqueous emulsion paints for coating, and can be used for indoor and outdoor wood, plaster, polyurethane foam, concrete, cardboard and metal structures in construction, aviation, railway transport and in other areas where required protection of the surfaces of such products from fire.

 Fire-retardant coatings have a fire-retardant effect in the protection of easily combustible surfaces (wood, cardboard) and a heat-insulating effect in the protection of metal and other hardly combustible surfaces in order to increase their fire resistance in case of fire. The principle of the protective effect of most coatings is to reduce the depth and speed of heating of the surface to be protected.

 The decisive factor determining the effectiveness of the fire retardant action of the coating is their heat-insulating ability, which largely depends on the thickness of the coating.

 However, an excessive increase in the thickness of the coating can adversely affect its performance. From this point of view, the most promising are fire retardant intumescent coatings having a relatively small thickness, which increases significantly in fire conditions at high temperature impacts.

 Known fire retardant intumescent composition for coating on the basis of a water-soluble urea-formaldehyde resin as a binder, including ammonium polyphosphate, dicyandiamide, pentaerythritol, kaolin, fiberglass and water (RU 2028348, 1995).

 However, the preparation of such a composition must be carried out immediately before coating, which is not technologically advanced, and the presence of dicyandiamide, which releases toxic substances during combustion, makes the composition toxic and degrades the environment.

 Closest to the proposed is fire-retardant intumescent paint, including in wt.%: Aqueous acrylic dispersion or a mixture of it with a homo- or copolymer vinyl acetate dispersion - 31.0-37.0, ammonium polyphosphate - 17.0-23.0, pentaeryth - 9.0-13.0, titanium dioxide 1.0-3.0, talc or microtalc 5.0-8.5, anionic and / or nonionic surfactant 0.2-0.3, coalescing additive - 1.7-1.85, a thickener based on cellulose ethers - 0.1-0.2, antifoam - 0.3-0.4, sodium tetraborate - 0-0.1, water - the rest [US Pat. RU 2174527 C1, published on 10/10/2001]. However, it has insufficient water resistance and fire retardant properties.

 The technical task of the claimed invention is to improve the water resistance and fire retardant properties, which allows it to be widely used in construction for both external and internal works on wood, metal and plaster.

This technical problem is solved in that the fire retardant intumescent paint, including aqueous acrylic dispersion, cellulose ether thickener, anionic surfactant, pentaerythritol, ammonium polyphosphate, titanium dioxide, silicone antifoam, preservative, coalescing additive, water, additionally contains a paraffin wax or phosphate melamine and a low molecular weight acrylic polymer dispersion; as an aqueous acrylic dispersion, an unplasticized polymer dispersion of acrylic copolymer Limer with vinyl versatate, as a coalescing additive - a mixture of 2,2,4-trimethyl-1,3 pentadiol monoisobutyrate with butyl cellosolve, sodium carboxymethyl cellulose as an ether cellulose thickener, and isothiazolone derivatives as a preservative, as an anionic polyphosphate sodium, in the following ratio of components, wt.%:
Unplasticized polymer dispersion of acrylic copolymer with vinyl versatate - 18.0-22.0
Pentaerythritol - 8.0-15.0
Ammonium Polyphosphate - 20.0-25.0
Polyphosphate Na - 0.1-0.5
Melamine - 10.0-15.0
The dispersion of low molecular weight acrylic polymer is 0.1-0.5
Sodium carboxymethyl cellulose - 0.2-0.4
Derivatives of isothiazolone - 0.1-0.3
Titanium Dioxide - 4.0-8.0
Silicone defoamer - 0.5-1.0
2,2,4-trimethyl-1,3-pentadiol monoisobutyrate - 0.2-0.5
Butyl cellosolve - 0.3-0.8
Chloroparaffin or phosphate plasticizer - 2.0-5.0
Water - Else
The paint may additionally contain silicon dioxide in an amount of 0.5-1.0%.

 As an unplasticized polymer dispersion of an acrylic copolymer with vinyl versatate, any non-plasticized dispersion of an acrylic copolymer with vinyl versatate can be used, for example, a Finndisp RSD 20 dispersion from Forcit (Finland), which is a dispersion of a block copolymer of butyl acrylate, methyl acrylate, ethyl acrylate, and vinyl versatate.

 As a dispersion of a low molecular weight acrylic polymer, Polyphob TR 117 is used, which is a dispersion of a low molecular weight acrylic polymer based on ethyl acrylate from Union Carbide (Belgium), Acrisol RM-5 from Room and Haas and others.

As ammonium polyphosphate, Exolit AP 422, 462 from Clariant (Germany) or modified ammonium polyphosphate FR Cros 484 from Budenheim Iberica are used. SM (Spain), they all have the formula (NH ₄ ) _{n + 2} P _n About _{3n + 1} .

 As preservative additives, isothiazolone derivatives are used, for example, Metatin K 604, K 520 from Acima (Switzerland), having the formula 5-chloro-2-methyl-4-isothiazolin-3-OH; 2 methyl-4 isothiazolin-3OH; Mergal K 9N from Ciba (Switzerland) having the formula 5-chloro-N-methylisothiazolinone, N-methylisothiazolinone.

 As 2,2,4-trimethyl 1,3-pentadiol monoisobutyrate used Texanol company Eastman (England).

хлорпарафин, например ХП-470, или импортные фосфатные пластификаторы типа триарилалкилфосфатов, например AmGard TBEP, представляющий трибутоксиэтилфосфат, фирмы Rhodia (Франция).As a plasticizer, domestic grade B phosphate plasticizer (TU 6-06-241-92) is used, having the empirical formula

chloroparaffin, for example CP-470, or imported phosphate plasticizers such as triarylalkyl phosphates, for example AmGard TBEP, representing tributoxyethyl phosphate, from Rhodia (France).

 Silicon dioxide is used silica grade Siloid ED-3 company Grace Davison (Germany).

 Organo-modified polysiloxane Tego Foamex 810 (Germany, company Tego), silicone polyester with a solid substance Tego Airex 901W, silicone antifoam PMS-200 or mixtures thereof are used as silicone antifoam.

The paint is prepared, for example, as follows. Water, sodium carboxymethyl cellulose, sodium polyphosphate, isothiazolone derivatives are loaded into the apparatus with a stirrer, and they are mixed until uniform at a temperature of 40-60 ^{° C.} for 40-60 minutes. Then, butyl cellosolve, chloroparaffin or a phosphate plasticizer, melamine, pentaerythritol, titanium dioxide are loaded into the same mixture, the mixture is ground in a grinding apparatus or a high-speed mixer, then a dispersion of an acrylic copolymer with vinyl conversate 2,2,4-trimethyl-1 is added to the resulting mass. 3-pentadiol monoisobutyrate, ammonium polyphosphate, silicone defoamers, low molecular weight acrylic dispersion, if necessary, silicon dioxide.

 Paint is applied with a brush, roller, spray.

 Examples of compositions according to the invention are shown in table 1, indicators of coatings based on them are shown in table 2.

 As can be seen from the tables, the proposed paint has a higher water resistance and fire retardant properties, expressed in an increase in the expansion ratio and a more durable foam layer.

Claims (2)

1. Fire retardant intumescent paint, including a water-based acrylic dispersion, an etherocellulose thickener, an anionic surfactant, pentaerythritol, ammonium polyphosphate, titanium dioxide, silicone antifoam, preservative, coalescing additive, water, characterized in that it additionally contains chlorine paraffin phosphate plasticizer, melamine and a low molecular weight acrylic polymer dispersion; as an aqueous acrylic dispersion, an unplasticized acrylic polymer dispersion the copolymer with vinyl versatate, as a coalescing additive, a mixture of 2,2,4-trimethyl 1,3-pentadiol monoisobutyrate with butyl cellosolve, sodium carboxymethyl cellulose as a cellulose thickener, isothiazolone derivatives as a preservative, and an anionic surfactant as an active substance sodium polyphosphate in the following ratio, wt.%: Unplasticized polymer dispersion of acrylic copolymer with vinyl versatate 18.0-22.0 Pentaerythritol 8.0-15.0 Ammonium Polyphosphate 20.0-25.0 Polyphosphate Na 0.1-0.5 Melamine 10.0-15.0 Low molecular weight dispersion acrylic polymer 0.1-0.5 Sodium carboxymethyl cellulose 0.2-0.4 Derivatives of isothiazolone 0.1-0.3 Titanium dioxide 4.0-8.0 Silicone defoamer 0.5-1.0 2,2,4-Trimethyl-1,3-pentadiolmonoisobutyrate 0.2-0.5 Butyl cellosolve 0.3-0.8 Chloroparaffin or phosphate plasticizer 2.0-5.0 Water Else 2. The paint according to claim 1, characterized in that it further comprises silicon dioxide in an amount of 0.5-1.0 wt.%.

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