RU2191111C2 - Composition for fire and biological protection of wood - Google Patents

Abstract

FIELD: woodworking. SUBSTANCE: invention, which can be applied in a variety of areas where noncombustible and rot-resistant materials and units are used, provides composition for fire- and biological-protection coatings, which contains equimolecular mixture of phosphorous acid-urea interaction products. Depending on which value of relative viscosity and, respectively, which degree of fire protection is needed, corresponding amount of water is added. Advantageously, phosphorous acid-urea interaction is carried out at 45-54 C and composition is diluted with 25-30 wt % of industrial water to achieve viscosity 9.8-10.4 sq.mm/c. In order to deepen impregnation of wood, composition is supplemented by 0.1-0.5 wt % of nonionic surfactant. EFFECT: lowered viscosity of finished product. 2 cl, 2 tbl, 3 ex

Description

 The invention relates to the field of protection of wood from fire and biodeterioration and can be used in the woodworking industry, construction and other fields to obtain non-combustible materials and structures that are not susceptible to decay.

 Known use for fire and bioprotection of wood compounds based on organophosphorus and nitrogen compounds.

 The well-known "Fire retardant for fire-retardant paints and varnishes" (RF patent 2119931, C 09 D 5/18, C 09 K 21/12, 1998), containing a mixture of reaction products of the interaction of pentaerythritol, dialkylphosphite, maleic anhydride and formamide.

 The disadvantage of this composition is the use of dialkyl phosphite, which increases the cost of the final product and increases the fire hazard of production.

Closest to the proposed solution is the invention "Composition for fire and bioprotection of wood" (RF patent 2061589, 27 K 3/36, 09 K 21/12, 1996), containing a mixture of the products of the interaction of equimolar amounts of dialkylphosphite with urea at 34- 78 ^o With the total content in the flame retardant: phosphorus - 8.2-20.2 wt.%, Nitrogen - 3.6-16.4 wt.%.

 However, the disadvantage of this composition is the use of dialkyl phosphite, the production of which is expensive and requires the use of special technologies related to the appearance of toxic products and high fire hazard. The use of dialkyl phosphite as a phosphorylating agent of fire and bioprotective preparations, in turn, also leads to their cost increase and increased explosion and fire hazard of their production.

 The aim of the present invention is to increase fire safety in the production of fire and bioprotective compositions, obtaining high flame retardant properties while reducing the cost of the final product.

 This goal is achieved by using phosphorous acid as a phosphorylating agent. Composition for fire and bioprotection of wood contains a mixture of reaction products of equimolar amounts of phosphorous acid and urea. To obtain the necessary viscosity, industrial water is added to the composition.

Mostly, the composition for fire and bioprotective coating of wood contains a mixture of the products of the interaction of phosphorous acid with urea in a molar ratio of 1: 1, at a temperature of 45-54 ^o C. To obtain the required conditional viscosity of the composition of 9.8-10.4 mm / s viscometer VZ-246 (nozzle with a diameter of 2 mm) at a temperature of 20 + 0.5 ^o C, technical water is added to it at a rate of 25-30 wt.%.

 For deeper impregnation of wood, which increases the fire-retardant properties of fire-retardant products, a composition containing a mixture of the products of the interaction of phosphorous acid and urea, diluted with technical water to the required viscosity, is additionally introduced 0.1-0.5 wt.% Surfactant nonionic type, for example, wetting agent OP-10.

 Thanks to the addition of a wetting agent, the penetrating ability of the composition is increased.

 To protect wood from fire and biodeterioration, a composition of 180-230 g / m is applied to its surface.

 The invention is illustrated by the following examples.

Example 1. The composition is prepared as follows. Phosphorous acid and urea in amounts of 82 g and 60 g, respectively, are mixed at room temperature. The resulting mixture is gradually heated to a temperature of 54 ^o With constant stirring until a homogeneous pasty mass. The reaction mass is maintained at this temperature for 4-5 minutes. After that, the mass is cooled to a temperature of 20 + 5 ^o C, diluted with technical water in an amount of 25 g and stirred until a clear, clear liquid with a nominal viscosity of 9.8 mm / s by viscometer VZ-246 (nozzle with a diameter of 2 mm) is obtained, temperature 20 +0.5 ^o C.

 Example 2. In the obtained, as described in example 1, liquid (167 g) add 0.3 wt.% (0.42 g) of the wetting agent OP-10; mix until complete dissolution of the wetting agent and defend for 10-15 minutes until the disappearance of air bubbles in the liquid. The nominal viscosity is 10.4 mm / s according to the VZ-246 viscometer (nozzle with a diameter of 2 mm).

 Example 3. In the obtained, as described in example 1, liquid (167 g) add 0.3 wt.% (0.42 g) of the wetting agent OP-7; mix until complete dissolution of the wetting agent and stand for 10-15 minutes until the disappearance of air bubbles in the liquid.

 The nominal viscosity is 9.8 mm / s according to the VZ-246 viscometer (nozzle with a diameter of 2 mm).

 Table 1 shows the physico-chemical properties of the proposed and known compositions.

 In the table. 2 shows the operational properties of the proposed and known composition.

Claims (2)

 1. Composition for fire and bioprotection of wood based on a phosphorus-containing and nitrogen-containing organic flame retardant containing a mixture of reaction products of equimolar amounts of a phosphorylating agent with carbamide, characterized in that phosphorous acid is used as the phosphorylating agent, and the required viscosity of the composition is obtained by adding water to it.  2. The composition for fire and bioprotection of wood according to claim 1, characterized in that it further comprises 0.1-0.5 wt.% Surfactants of non-ionic type.

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