Flameproof coating

FIELD: protective coatings and fire protection.

SUBSTANCE: invention relates to flameproof swelling coatings mainly for vermiculite-based wood materials for use in construction, especially for coating wood and metallic surfaces and wood articles designed for use in high-temperature media. Claimed flameproof coating is made from composition containing Portland cement, swelled vermiculite, water, and additionally mullite-silica fiber, Al2O3, and Mecellese additive. Such composition leads to prolonged activity, reduced heat conductance of coating, widened application area thereof, and possibility of using material to protect articles and stuffs against high temperature-caused inflammation. Coating also allows time needed to heat article to critical temperature to be increased by a factor of 1.5-2, consumption of coating per unit area to be increased by 10-15%, and coating-article surface adhesion quality to be improved.

EFFECT: improved performance characteristics of coating.

1 tbl

 

The invention relates to a fire retardant intumescent coatings, primarily for wood-based materials vermiculite. And can be used for its intended purpose when the coating of wood products and materials from wood for their operation in environments with high temperatures.

Known fire retardant coating for wood structures, including asbestos, fillers, silicate of sodium or potassium, and water, as filler in it used white carbon black, titanium dioxide and emulsion polyvinyl chloride (see, for example, USSR author's certificate No. 1180389 on CL 09 To 21/00, 1985).

The disadvantage of this coating is the inability to cover wood products and wood-based materials used in the air, because when exposed to a high temperature polyvinyl chloride decomposes and breaks down the coating. In addition, the decomposition of the coating is allocated toxic substance type of chlorine that makes it unsafe use in the national economy.

Also known fire-retardant coating on the basis of liquid glass, into which is introduced the organic binder in the form of a water-soluble polymer K-9 containing saponified waste Narodnogo fiber and the solution coagulum (see USSR author's certificate No. 1604830 on CL 09 To 21/00 for 1990).

Nedostacha which the coating is that it can only be used to fill cracks on the containers for rail freight, and protects only the possibility of ignition sources through leaks containers. In addition, included in the coating liquid glass is a battery moisture with subsequent destruction of the coating under the influence of air at high and low temperatures.

The closest in technical essence to the present invention is a fire-resistant coating for deck structures containing asbestos, Portland cement, expanded vermiculite and aluminum sulfate dissolved in water (see USSR author's certificate No. 1342906, CL 09 To 21/04 in 1987).

However, with all the inherent advantages of this coating, it has significant shortcomings. One disadvantage of this coating is a low resistance when exposed to high temperatures (less than 0.5 hour), removal of the cover from its application, as well as a large flow rate of the coating when applied to the surface of the product. In addition, the coating is designed for metal surfaces and its thermal conductivity is high. As a result, under the influence of high temperature surface of a product or material under the coating overheat and ignite. The poet is mu this fire-resistant coating is designed for metal products and materials and are not suitable for wooden products and materials.

The technical object of the present invention is to eliminate the above disadvantages, increasing the validity of the coating when exposed to high temperatures, reducing thermal conductivity of the coating and the possibility of its use in the protection of timber products and materials from ignition when exposed to high temperatures.

The specified technical task is achieved by the fact that in the proposed fire retardant coating containing Portland cement, expanded vermiculite and water, additionally contains mullite-silica fiber (Al2O3and MECELLESE (FMC - 2070) in the form of hydroxypropyl methylcellulose in the following ratio of components

Portland- 35-40%
Exfoliated vermiculite- 8-10%
Mullite-siliceous fiber- 5-10%
Additive Mecellese- 0,4-0,8%
Water- The rest.

The coating composition is prepared as follows. All components according to the recipe before loading into the mixer subjected to examination for compliance with the technical conditions. Then each component is weighed and loaded into the mixer. Then within a certain period of time is paramesh is of a change in the direction of rotation. Then the mixture is filled into a container (usually in valve bags) and shipped to the consumer, for example on construction sites. The consumer to the mixture is added water, and again is mixing directly on the construction site before applying the coating to the surface to obtain a homogeneous mass.

The resulting coating is applied to wooden structures one of the known methods (brush, paint sprayer, dipping, etc.). Before coating the surface of the wooden structure is wetted with a solution of soda. The formation of the coating is carried out at room temperature for 24 hours. To accelerate the formation of the coating can be used to forced drying at a temperature of 80°C. Performance comparison of coverage is the time to reach the maximum allowable average exceeded the initial temperature on the unheated surface, which equals 200°C. the thickness of the test specimens selected 4 mm.

Testing presents 7 samples at different percentages of the selected components. The results are given in the table. As can be seen from the data presented in the table, the proposed composition for fire-resistant coating has a high resistance and adhesion to the surface of the sample, hundred is the influence of temperature. While the mass loss of wood sample does not exceed 9%.

The application of the proposed coating will extend the time of heating the sample up to the critical temperature in 1.5-2 times, reduce the amount of consumption of the coating per unit area by 10-15% and increase the quality of adhesion of the coating to the surface of the samples is compared with the known fire-retardant coatings on the basis of expanded vermiculite.

Table
No. sampleThe components of the coating composition, %The heating temperature in the chamber in degrees CelsiusThe time limit of fire resistance, minAppearance of the coating after exposure to the fire
Portland cementExfoliated vermiculiteMullite-siliceous fiberMethylhydroxypropylcelluloseWater
2555,01,064,013945,2Darkened
23585,00,851,213947,4Delaminations no
3409100,7of 40.313952,8-"-
44010100,639,413990,3-"-
54010100,439,613960,1-"-
64015150,429,613948,1-"-
74515200,319,713940,1Darkened
Known5510--35.0139of 37.8Charred and flaking

Fire-resistant coating made from the composition containing Portland cement, expanded vermiculite and water, characterized in that it further comprises meritocratic fiber Al2O3and additive Mecellese in the following ratio, wt.%:

Exfoliated vermiculite8-10
Portland35-40
Meritocratic fiber Al2O35-10
Additive Mecellese0,4-0,8
WaterRest



 

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