Fireproof blowing paint

FIELD: fireproof paint-vehicle protective materials.

SUBSTANCE: claimed paint contains polymeric binder, solvent and blowing additive consisting of pentaerythritole and ammonium polyphosphate at ratio of 1:1.3-2.6, respectively, and in addition expanded graphite. Materials of present invention useful in building industry, aviation, railway transport, etc.

EFFECT: paint with improved functionality, increased fire resistance, and expanded blowing temperature interval.

3 cl, 4 ex, 2 tbl

 

The invention relates to fire-retardant paints, varnishes and lacquers that are designed to protect different designs and materials, and can be used, for example, in construction, aviation, railway transport and in other areas where the surfaces are protected from fire.

Known fire retardant intumescent composition, protected by the RF patent №2028348, IPC 09 D 161/30, 09 D 161/24, 09 D 5/18, publ. 1995.02.09. The composition includes a water-soluble urea resin, n-tert-butylbenzaldehyde resin, ammonium polyphosphate, dicyandiamide, kaolin, glass, petrol or pentaerythritol, water.

The disadvantage is a low foaming when exposed to fire.

Known fire-retardant coating and method thereof that is protected by RF patent No. 2105029, IPC 09 To 21/14, publ. 1998.02.20. Known fire-retardant coating contains oxidized graphite with a degree of expansion of 50-400, expanded graphite with a bulk density of 5-10 kg/m3and additionally ternary ethylene-propylene-diene or NBR. The disadvantage of the material is low efficiency, because the material starts to operate at high temperature (300° (C), and the resulting foam has a low mechanical strength in the gas stream. Due to the fact that the known material is obtained in the form of glastechnik sheets, narrows its scope and increase labor costs for providing fire protection of various structures.

Closest to the claimed technical essence and the achieved result, selected as a prototype, is fire retardant intumescent paint, protected by the RF patent №2174527, CL 09 D 5/18, 131/04, 133/00, publ. 2001.10.10. Fire-retardant paint is an aqueous dispersion based on acrylic dispersion or a mixture of it with a Homo - or copolymer dispersion of vinyl acetate and contains as an intumescent additive mixture of pentaerythritol and ammonium polyphosphate with a ratio of 1:1.3 to 2.6, respectively, as well as anionic and/or nonionic surfactant, defoamer, aterially thickener, preservative additive, titanium dioxide, talc or micro-talc may tetraborate of sodium and water in certain proportions of these components. The disadvantage of this structure are: that fire-retardant paint is to be used only for interior applications due to their low resistance to atmospheric agents (rain, snow etc), low degree of swelling and because of this lack of resistance, and a small temperature range blistering paint.

The problem solved by the invention is the improvement of fire-retardant intumescent cu the ski.

The technical result from the use of the invention is to expand the functionality of the paint, to increase the fire resistance and the extension temperature interval of expansion.

This result is achieved in that the fire retardant intumescent paint containing polymer binder, solvent and intumescent additive based on pentaerythritol and ammonium polyphosphate, further comprises the composition of the intumescent additives expanded graphite in the following ratio of components, wt.%:

polymer binder - 25,0-42,0

the pentaerythritol - 10,0-19,0

ammonium polyphosphate - 18,0-32,0

expanded graphite - 5,0-15,0

solvent - rest

Quantitative sootnosheniya pentaerythritol and ammonium polyphosphate is 1:1.3 to 2.6, respectively.

The solvent should be sufficient to provide a viscosity of the solution.

In the ink according to the invention as a polymer binder used polymer dispersions such as styrene-acrylic, polyvinyl acetate or styrene-butadiene dispersion, and can be used perchlorovinyl varnish or silicone varnish, for example CO-075, in an organic solvent, such as xylene or toluene.

The paint may contain additional flame retardants, such as liquid glass (sodium silicate); pigments, such as dio is led titanium; Surfactants, such as fatty alcohol ethoxylates; stabilizers, such as carboxymethylcellulose (CMC), and plasticizers, such as dioctylphthalate (DOP) in an amount not exceeding 10% by weight of the composition. Expanded graphite can be used, for example, marks RG-M (TU 5728-006-115907317-99), perchlorovinyl lacquer on the EAST 6-01-37-88 any producers, pentaerythritol and ammonium polyphosphate - technical, polymer aqueous dispersion, for example, mark “Lakel e-21” THE 2241-017-50955201-2001.

Fire retardant intumescent paint is manufactured as follows. Originally prepared intumescent additive. To do this, pentaerythritol, ammonium polyphosphate and expanded graphite clobber on kraskoterke until a homogeneous fine mass.

In the mixer download the aqueous dispersion of the polymer or varnish in an organic solvent and the resulting intumescent additive. The resulting mixture is stirred for 20-25 minutes

Then in a mixer add water or solvent. The composition is stirred for 1-1 .5 hours.

By the end of the process get a homogeneous mass, which is applied on the protected surface. The composition can be applied by brush, roller or by spray. The flow rate of not less than 0.3 kg/m2for wood and not less than 1.5 kg/m2for metal. Drying the first layer is 1.5 hours, the next 1 hour. Finally fo is the formation of a protective layer is after 36 hours.

The proposed ratio of components in the paint is best found experimentally and ensures the production of a material with high flame-retardant properties. The change in the composition of the polymeric binder leads to the deterioration of the paint. Increasing the amount of polymeric binder above 42 wt.% leads to poor flame retardant properties by increasing the content of gas phase. When reducing the amount of polymer binder less to 25.0 wt.% deteriorating physical and mechanical properties of the ink, in particular the adhesion to the surface of the treated material. The increase in the number of expanded graphite in the paint more than 15 wt.% leads to a significant appreciation with a slight increase in flame retardant properties, and reducing the number of expanded graphite of less than 5.0 wt.% leads to reduction of flame retardant characteristics. The change in the ratio of pentaerythritol to the ammonium polyphosphate in the direction of increase or decrease of one component leads to the worsening of the swelling ability of the composition. The following examples illustrate the invention.

Example No. 1.

13,0 g of pentaerythritol, 18.0 g of ammonium polyphosphate and 10 g of expanded graphite clobber on kraskoterke until a homogeneous fine mass. In the mixer load 42 g of an aqueous styrene-acrylic dispassionate "Lakel" e-21 and the resulting homogeneous fine mass.

The mixture is stirred for 20 minutes Then add water in an amount sufficient to provide a viscosity of the solution. The composition is stirred for 1-1 .5 hours.

Ready fire retardant intumescent paint in accordance with fire 251-98 1 provides a group of fireproof efficiency (means providing nonflammable wood), weight loss by burning less than 2%.

The fire retardant properties of this composition for metal structures evaluated by measuring the temperature of the protected surface of the sample after 15 minutes of exposure to an open flame with a temperature of 900-1000°C.

The flame was created by a gas burner nozzle which was at a distance of 80 mm from the sample surface.

The temperature of the protected surface measured using a thermocouple paired with a potentiometer.

Adhesion was determined according to GOST 15140.

Examples No. 2 and 3 carried out analogously to example No. 1. Data on the composition of the compositions are given in table 1.

The basic properties of the obtained compounds are shown in table No. 2.

Example No. 4.

15.0 g of pentaerythritol, 30.0 g of ammonium polyphosphate and 14 g of expanded graphite clobber on kraskoterke until a homogeneous fine mass. In the mixer load the resulting mass and 25 g of perchlorovinyl varnish.

The mixture is stirred for 20 minutes Then sledovatelno download 16 g of the solvent xylene. The composition is stirred for 1-1 .5 hours. Examples No. 5, 6, 7 carried out analogously to example No. 4. The data summarized in tables 1 and 2. Ready fire retardant intumescent paint in accordance with fire 251-98 1 provides a group of fireproof efficiency (means providing nonflammable wood), weight loss by burning less than 2%.

As can be seen from table No. 2, the introduction of expanded graphite in the claimed composition significantly increases its fire-retardant properties compared with a mixture of pentaerythritol and ammonium polyphosphate, due to the greater coefficient of expansion, and increases the working temperature range of the coating. Because of the mixture of ammonium polyphosphate and pentaerythritol foaming temperature is 250-300°With the introduction of the expanded graphite leads to the fact that the swelling continues and above 300°C.

Thus, the present invention allows to apply the paint not only internal, but also external works by using as a binder perchlorovinyl varnish in an organic solvent or its substitutes. Advantages of the claimed ink before the prototype are higher fire resistance and increase the operating temperature range of the coating, as well as its lower consumption, while a thinner coating layer provides t the same degree of fire protection.

20,0
Table No. 1
Name of the componentThe ratio of components, mass %
1234567
50% styrene-acrylic dispersion brand "Lakel" e-21, TU 2241-017-50955201-200142,0------
50% polyvinyl acetate dispersion-39,0-----
50% butadiene-styrene dispersion--32,0----
Perchlorovinyl varnish (resin content 40%)---25,035,0--

Silicone lacquer KO-075 THE 6-02-1-030-91 (resin content 40%)-----25,035,0
Ammonium polyphosphate18,024,032,030,020,030,0
The pentaerythritol13,0to 12.019,015,010,015,010,0
Expanded graphite10,06,05,014,011,015,010,0
Waterof 17.019,0to 12.0----
The solvent is xylene or toluene---16,024,015,025,0

Table No. 2
Characteristics of the compositions
number ofthe coefficient of adhesion (points)the degree of expansion, %the temperature on the back surface after 15 minutes of fire exposure,°the temperature interval of expansion,°
122080139250-700
221920158250-700
331830167250-700
42114250-700
512130130250-700
622480100250-700
712050147250-700

1. Fire retardant intumescent paint comprising a polymeric binder, a solvent and intumescent additive based on pentaerythritol and ammonium polyphosphate, characterized in that it further comprises the composition of the intumescent additives expanded graphite in the following ratio, wt.%:

Polymer binder 25,0-42,0

The pentaerythritol 10,0-19,0

Ammonium polyphosphate 18,0-32,0

Expanded graphite 5,0-15,0

The solvent Else

2. Fire retardant intumescent paint according to claim 1, characterized in that it comprises a polymeric binder polymer water dispersion, for example, styrene-acrylic, polyvinyl acetate, or styrene-butadiene dispersions.

3. Fire retardant intumescent paint according to claim 1, characterized in that it comprises a polymeric binder perchlorovinyl varnish or silicone varnish.



 

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