Foaming composition for fire retardant coating

 

(57) Abstract:

Describes foaming composition for fire-retardant coatings applied to metallic and nonmetallic substrates, namely, that as the polymer base used methylphenylsiloxane rubber, as a hardener - cremesheen, as a blowing agent is a mixture of intercalated graphite and pearlite, as flame retardant - boron nitride and further comprises methylphenylsiloxane resin in the following ratio, wt.h.: methylphenylsiloxane rubber 100, crennelated 5-20 intercalated graphite 15-30, perlite 15-30, boron nitride 15-30, methylphenylsiloxane resin 8-20, organic solvent 40-90. The technical result is to increase the stability of the coating to high pressure, the temperature of the flame 1100-50oWith, as well as the coating does not emit significant quantities of polluting gases. 1 C.p. f-crystals, 2 tab.

The invention relates to the field of production of fire-retardant coatings for thermal protection from exposure to flame metallic and non-metallic surfaces of the structures in aviation, shipbuilding, machine building, aerospace and electronics industries.

The lack of coverage on the basis of this composition is a low resistance due to thermal oxidative degradation of the coating when exposed to a temperature of 150oC and above.

Known flame retardant foaming composition based vspuchivanija graphite 10-60 wt.%, polymeric binders - framework - 5-25 wt.% (chloroprene rubber, polyethylene, polyvinyl acetate or polyacrylate, or mixtures thereof, or an aqueous latex dispersion), substances forming the carbon cage in case of fire, for example phenol-formaldehyde resin 2-25 wt.% and the beads of 0.5-5 wt.% (GERMANY 4135678, FROM 08 TO 21/00, 1991). The composition is applied in paste form or used by coating on the glass fiber or carbon textile webs in the manufacture of fire-resistant plates and tape to seal joints and openings designs.

The disadvantages of this composition, which does not allow long-term exploitation in conditions of high temperature heating, are education masoprocol innych binder carbon frame, exposed to intensive oxidation at temperatures above 250oC.

The closest in technical essence adopted for the prototype are foaming composition WASP-4 and WASP-4U for fire-resistant coating of metallic and non-metallic surfaces (TU 1-595-15-538-98), containing in its composition dimethylsiloxane rubber as a polymer base, melamine in combination with pentaerythritol as foaming agents, ammonium monitorfebruary as a flame retardant, determinability tin as a hardener and gasoline as a solvent in the following ratio, wt. including:

Basis: dimethylsiloxane rubber (GOST 13835) - 100

Foaming agents:

pentaerythritol (GOST 9286) - 40-60

melamine (GOST 7579) - 25-35

Fire retardant: ammonium monitorfebruary (GOST 3771) - 40-60

Hardener: determinability tin (18) (TU 6-02-805) - 4-6

Solvent: benzene (GOST 443) - 15-25

Data flame retardant compositions can not be used to protect the internal habitable space, as the process of foaming in fire conditions is accompanied by release of a large number of heavily polluting gaseous products (carbon oxide, the act shall be intumescent fire retardant coating has no resistance to shear stress friction from the gaseous stream, what makes the coating ineffective in protecting the external surfaces of aircraft and limits its use in other vehicles (road, rail). Long curing (24 hours at a temperature of 20o(C) does not allow to produce the coating belt type.

An object of the invention is the creation of a foaming composition for the manufacture of high-performance fire-retardant coating, resistant to high pressure from a gas stream of fire extinguishers that do not emit significant amounts of polluting gases under conditions of exposure to flames and protect products from exposure to flame with a temperature 110050oC. the Composition should be applied techniques pneumoniae, spatula and provide the possibility of applying it on tape for the manufacture of a belt fire protection.

To solve the problem proposed foaming composition having the following composition, wt. including:

Basis: methylphenylsiloxane rubber (TU-103-129-77) - 100

Hardener: crennelated (TU 6-02-1003-75) - 5-20

Foaming agents:

intercalated graphite (experimental) - 15-30

perlite ((TU 6-02-946-74) - 8-20

Organic solvent - 40-90

The compositions may be applied to metallic and nonmetallic substrates. As a non-metallic substrates can be used fabrics, ribbons, needle felts, felts and mats made of glass, polymer and carbon fibers. The proposed composition differs in that it can be applied to the glass woven patterns.

The composition is applied by spray, trowel, watering and other applicable industry methods.

The proposed composition differs from the composition of the prototype that as the basis contains methylphenylsiloxane rubber, as a foaming agent is a mixture of intercalated graphite and pearlite, as a flame retardant additive is boron nitride, as a hardener - cremesheen. The composition additionally contains methylphenylsiloxane resin as coke forming binder.

A mixture of intercalated graphite and pearlite provides an implementation of the process of expansion of the coating without releasing volatile products and to obtain dense monolithic coke with evenly distributed small porosity. The absence of a strong smoke gaseous fly the fuck the cabin crew, crew compartments of the spacecraft.

Introduction to composition methylphenylsiloxane resin provides education penola, consisting of high-strength thermoerosional foam coke resistant to shear the efforts of gas or wind flow, allowing the use of a coating on exterior surfaces of aircraft, the nacelle, the containers protection of useful information. The reliability of the fire retardant coating thus multiplied, as in fire conditions Penology overlaps the underlying layers that are unaffected by decomposition.

Methylphenylsiloxane resin having high elongation under tension, in combination with methylphenylsiloxane rubber allows to obtain elastic coating, including ribbon type, high elongation, low modulus of elasticity combined with high temperature resistance necessary to improve flame retardant properties.

The boron nitride in the heating process melts with the formation of a viscous film, which spreads on the walls of the pores and hinders the oxidation and burning of foam coke.

Use kremnezemistye as a hole is sposobnosti from 30 min to 2 h, thus providing the opportunity for application of fire retardant coating on the tape substrate and the production of belt fire protection for pipelines. A tape substrate made of heat-resistant fibers provides increased reliability of fire protection in extreme thermodynamic effects of fire and emergency foam coke ash from this layer.

Examples of implementation.

Example 1. The coating was applied as follows: on one side duralumin plate alloy D19 after the surface preparation was applied to the soil according to the technology, and then a spray of fire retardant composition. The composition was maintained at a temperature of 20+5oWith within 24 hours of the Test coating was carried out under conditions of exposure to products of combustion of the air-gasoline mixture at a temperature of stream 110050oAnd pressure Pabout=1.2 ATM for 15 min (method VIAM). During the test measured the temperature of the substrate thermocouple. The coating thickness was 30.5 mm, the thickness of the substrate 1.25 mm

In example 2 and 3, the coating was applied respectively to the fiberglass and foam and have tested in the same conditions as in example 1.

Example 4. Tape fire retardant coating the/SUP>C for 45 min Composition composition produced by mixing the components in a sequence that ensures the vitality of 2.5 hours the Mixture was poured into a cuvette tape machine, which provided the tape through the slit gap and applying fire retardant composition on the tape. Tape with flame retardant coating was rewind to the bobbin. The thickness of the layer of the composition on the tape was 2+0.5 mm when the thickness of the woven tape 0.15 mm

The model for testing was a tube of aluminum alloy D16 alloy with a diameter of 25 mm with a wall thickness of 1 mm, with saccomanno thermocouple on the outer surface. The tube was caused to the Mat thickness 3 mm, the surface of which was applied tape with flame retardant composition. The prepared sample was tested on the stand, the mode of operation described in example 1. In the process of testing was carried out by visual observation and measurement of the temperature of the tube.

Example 5 shows the composition of the coating with a solvent system that is different from examples 1, 2, 3, 4. The coating produced according to the technology similar to the technology described in example 1.

Example 6 coating made according to the composition of the prototype, was applied onto a plate of aluminum is modern formulations of the inventive foaming fire-retardant coating compositions (examples 1-5) and the fire retardant coating composition of the prototype according to example 6.

In table.2 illustrates the properties of fire retardant coatings on the basis of the proposed foaming compositions (examples 1-5) and the composition of the prototype according to example 6.

In examples 1, 2, 3, 4, 5 floor smoked slightly and Penology had no erosion. When the test samples coated prototype floor heavily smoked and was partially carried away from the surface, starting with 7 min of the test.

As can be seen from the table.2, the inventive compositions provide a significantly lower heating of the surface to be protected and maintained without entrainment of foam coke.

The inventive flame retardant foaming composition used for the manufacture of high-performance multifunctional fire retardant coating for external surfaces and habitable compartments of vehicles.

1. Foaming composition for fire-retardant coatings applied to metal and non-metal substrate comprising a polymer base, curing agent, a blowing agent, a flame retardant and an organic solvent, characterized in that as the polymer base used methylphenylsiloxane rubber, as a hardener - cremesheen, as a blowing agent is a mixture of intercalated GRI the following ratio of components, wt. including :

Methylphenylsiloxane rubber - 100

Crennelated - 5-20

Intercalated graphite - 15-30

Perlite - 15-30

The boron nitride - 15-30

Methylphenylsiloxane resin - 8-20

Organic solvent - 40-90

2. The composition according to p. 1, characterized in that as a non-metallic substrate using fabric, ribbon, needle felts, felts and mats made of glass, polymer and carbon fibers.

 

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