Flame retardant for wood

 

The invention relates to compositions for protection against fire wood and can be used in woodworking and construction for wood processing. The composition contains ammonium sulfate, ammonium dihydrogen phosphate and phosphoric acid. A certain combination of components provides good flame retardant properties, opens wider use and more environmentally friendly. table 1.

The invention relates to compositions for wood protection against fire and can be used in the process of manufacturing wood products and preventive treatment of structures made of wood.

Known flame retardant composition described in the ed. mon. The USSR 178087 by CL 27 To 3/20, publ. 1966

Known composition contains the following components in the following ratio, wt.%: Finalalert - 23,0 of Diammonium phosphate 8,0 Water - 69,0 the Disadvantage of this structure is that the phenol incompatible with diammonium phosphate by reducing the pH to 5-6, promoting further polymerization of the original phenol. The time of survival of the composition depends on the degree of polymerization of the initial phenol and does not exceed 12 hours, i.e., the composition has neem composition and purpose is flame retardant, described in the ed. mon. 674904 by CL 27 To 3/15, 1997, and selected as a prototype.

Known composition contains a flame retardant in the composition of the phenol (25-30%), diammonium phosphate (9-10%), ammonium sulphate (6-7%), urea (12-20%) and ammonia (2,3-2,7) and water (the rest).

Here, urea and ammonia contribute to the combination of perspire with diammonium phosphate, increasing pH of the impregnating solution.

The disadvantages of this structure are the complexity of the composition (due to the large number of components) and limited use, since the impregnated semi-finished products and wood-based materials is carried out under pressure, followed by curing at four temperature increases with exposure for 9 hours. In addition, because of the presence among the components of the composition of the phenol production is harmful to the health of workers.

The aim of the invention is to reduce the number of components when expanding the capabilities of its use and more environmentally friendly production.

This objective is achieved in that the fire retardant composition containing a flame retardant comprising ammonium sulfate. According to the invention, the flame retardant contains dihydrogen phosphate and phosphoric acid in the following ratio to the of Mufasa and orthophosphoric acid as nitrogen and phosphorus compounds leads to the appearance in the presence of water system "nitrogen-phosphorus", synergism which consists in formation over the surface of the wood gas barrier of ammonia, impeding the access of oxygen and oppressive oxidation of carbon in the gas phase, which has the effect of blowing. The interaction of nitrogen with phosphoric acid under normal conditions prevents the hydrolysis of wood. At elevated temperatures, phosphoric acid is released and melts, coating the fibers of the wood with a protective film, preventing it from decay after cessation of flaming combustion. Thus, with fewer ingredients and good fire resistance it is possible to obtain a dry composition, suitable for use by dissolving it in water and for impregnation of wood without the use of pressure. In addition, the use of only the nitrogen and phosphorus components without the use of phenol increases the sustainability of the production of flame retardant.

In comparison with the prototype of the proposed composition has novelty, differing from it in the flame retardant composition, which includes additional dihydrogen phosphate and phosphoric acid, which, together achieving a given result.

Each of the essential features in itself known, but their habit is wow for professionals new technical result, not inherent characteristics of their disunity; the proposed solution is unknown at affordable applicant information sources prior art, from which it is not obvious to a person skilled in the industry and therefore corresponds, according to the applicant, the criterion of "inventive step".

The inventive composition can be widely used in the woodworking industry to protect the wood from the fire and therefore meets the criterion of "industrial applicability".

Fire-retardant composition contains the following components in the following ratio, wt.%: Map - 40-60
The ammonium sulfate - 40-60
Phosphoric acid is 0.5 - 3
Fire-retardant composition obtained by the present invention is applied in the form of an aqueous solution, which is prepared for the workplace by dissolving the dry mixture of the components in water in the ratio 1:3. Hot water is injected with a temperature of 60-80oIn the dry portion of the composition and quickly mixed.

Prepared impregnating solution is well stirred, and then assert within 1-2 hours until transparent, then use the rubber hose is poured into the prepared container and used for impregnation.

Fire retardant composition is applied to Zasadny designs cannot be protected impregnating composition - before impregnation, the surface must be free from paint and varnish, degreased and free from dust, dirt and other accretions and should be dry. Fire retardant composition is applied when the air temperature is not lower than -5oC, relative humidity below 65% and dried at air temperatures of +25oC.

Wooden structural elements are impregnated by the three processing flame retardant with a temperature of 10-15oWith or double flame retardant treatment with a temperature of 50-60oC. the interval between treatments should be at least 6 hours.

Consumption of flame retardant composition at three processing cold rstorm is 500-650 g/square m, with impregnation by immersion 600 g/sq.m

Tests processed the proposed composition of the samples on the fire resistance was carried out according to GOST 16336-76 in test fire laboratory, determining the weight loss of the sample at the maximum temperature increment method "fire tubes". Tested a sample size of 150 mm35 mm10 mm the Results are given in the table below.

Weight loss of the treated flame retardant material at the specified mixing ratio Sona composition with exorbitant proportion of components showing inappropriate use in this content listed in the table (examples 5-8).

In comparison with the prototype of the proposed composition has fewer components with good flame retardant properties of the composition and more wide application without requiring the application to handle the autoclave.


Claims

Fire retardant for wood, including as a flame retardant ammonium sulfate, characterized in that it additionally contains as flame retardants ammonium dihydrogen phosphate and phosphoric acid in the following ratio, wt.%:
The ammonium sulfate - 40-60
Map - 40-60
Phosphoric acid - 0.5-3i

 

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