Composition for wood fire- and biological protection

FIELD: woodworking industry, building materials industry, in particular wood fire- and biological protection.

SUBSTANCE: claimed composition contains (mass %): starch 4.13-5.0; phosphoric acid 18.36-20.0; amyl alcohol 2.0-3.0; dimethylphosphite 23.58-24.08; dimethylformamide 15.07-16.03; maleic acid 4.15-5.04, ethylene glycol 15.67-18.0, and balance: water. Composition of present invention has living time of 3 years.

EFFECT: composition providing wood fire- and biological resistance without quality losses.

3 tbl, 1 ex

 

The invention relates to woodworking and construction to protect the wood and materials based on it from fire and bioorganica.

At the present time, there are numerous impregnating compositions based on compounds of phosphorus, used to protect the wood from burning and bioorganica. Analysis of the composition of the impregnation showed that the most widely salt flame retardants containing inorganic phosphorus compounds. This is due to the numerous combinations of salt ingredients, their cheapness and ease of preparation. A protective layer formed by mineralization salt components among the fibers. The main disadvantages salt flame retardants are short-lived fire-retardant layer and "salting out" of drugs on the wood surface, which prevents further processing of wood paints. Therefore, the most effective are the fire-retardant chemicals on the basis of organophosphorus compounds [1-4], which converts the fiber surface layer of wood in a fire-resistant connection. The advantage of such compositions is durability fire-retardant treatment. Treated with reagents wooden surfaces, it is permissible to modify all types of paints and varnishes. Despite p the listed advantages of the above-mentioned compositions exclude the possibility of work on fire protection in construction site conditions at low temperatures, that puts the work on the fire protection in the category of seasonal or require additional creation of positive temperatures. Also the low efficiency of these compounds as flame retardants.

Most similar in composition to the invention are variants of compositions for fire - wood and biosecurity, including the mixture of reaction products of dimethylphosphite with diethylamino with the total content of phosphorus 20.1-20.6 wt.% and nitrogen 9.0-9.3 wt.%; the mixture of reaction products of dimethylphosphite with maleic acid with a total content of phosphorus 13.6-13.9 wt.%; the mixture of reaction products of dimethylphosphite with dimethylformamide with a total content of the phosphorus flame retardant 16.9-17.4 wt.%, nitrogen 7.6-7.8 wt.% [5]. The effectiveness of fire - wood and biosecurity these options compositions is significantly higher than other flame retardants containing phosphorus compounds.

However, the above options impregnating compositions [5] cannot be applied in the construction site conditions at low temperatures. In addition, at low costs them fire-retardant efficiency is small.

The aim of the invention is the creation of the exposed composition capable at low cost to provide a high level of fire protection of wood, without reducing its operational properties, and is suitable for use in conditions of the construction site until the temperature is s minus 30° C.

This is achieved by the fact that the proposed structure is a complex compound comprising a modified cocoordinating, flame retardant and anti-freeze. As koksoobrazovaniya composition contains a modified carbohydrate, meet the General formula (CxHyOz)n. Modification of carbohydrate - the process of hydrolysis in the presence of mineral acid is carried out with the aim of providing capillary impregnation. To improve the plasticizing composition in the products of the hydrolysis of starch introduce a small amount of monohydroxy alcohol of General formula R - HE, where R is alkyl containing five carbon atoms. As the flame retardant composition comprises a mixture of the products of the reaction of equimolar quantities of dialkylphosphate containing two alkyl carbon atom with Amida carboxylic acid of General formula RCONH2where R is alkyl contains two carbon atoms, and dicarboxylic acid of General formula HOOCRCOOH, where R is alkenyl containing two carbon atoms. As antifreeze composition contains marginal diatomic alcohol-glycol with the General formula CnH2+n(OH)2. To improve the mobility of the composition add water.

The composition is a mixture of components:

- starch 4.13-5.0 wt.%

- phosphoric acid 18.36 - 20.0 wt.%

- amyl alcohol 2-3 .0 wt.%

- dimethylphosphite 23.58-24.08 wt.%

-dimethylformamide 15.07-16.03 wt.%

- maleic acid 4.15 - 5.04 wt.%

- glycol 15.67 - 18.0 wt.%

- and water

The composition is a transparent colourless liquid density 1.12-1.448×10-3kg/m3with a refractive index 1.442-1.448, pH 2.1-3, pour point -30°S, conditional viscosity VZ-1 40-50C.

To protect the wood from catching fire, the composition is applied in amounts of 0.1-0.3 kg/m2to protect from Bioorganic - 0.06 kg/m2. The invention is characterized in the following example and table. 1-3.

Example 1

In the first stage of hydrolysate carry out the reaction of catalytic hydrolysis of starch in the amount of 5.0 wt.% at 90°in the presence of orthophosphoric acid (20.0 wt.%) for 40 minutes, followed by the introduction amyl alcohol (3 wt.%). Then in hydrolizates enter part of dimethylformamide (2 wt%). In the second stage in a pre-heated (not below 50° (C) the synthesizer pour 24.08 wt.% dimethylphosphite and 14.03 wt.% the rest of dimethylformamide, stirred and heated to 140°C, kept at this temperature for 20 minutes, then cooled to 120°and the reaction mixture is injected 5.04 wt.% maleic acid. The whole mixture is stirred, heated to 125°and incubated for 25 minutes and cooled to 80°C. In the third stage, an impregnating solution is prepared by mixing in hydrolysate at a temperature of 80°the obtained fosforsodyerzhascikh flame retardant and an aqueous solution of modified koksoobrazovaniya for 30 minutes, followed by the introduction of ethylene glycol in the amount of 18.0 wt.%. Next, the temperature was raised to 85°C, incubated for 25 minutes and then cool the reaction products to 22°C. the End product is a colorless resinous substance. To increase the mobility of the composition of its add water, preheated to 48-50°With, in the amount of 8.85 wt.%. The resulting mixture is poured into the accumulation tank.

The composition has the following operational characteristics:

1. Fire-retardant efficiency (weight loss in a ceramic tube) 1.78-3.52%, the duration of the self-burning and smouldering 0 seconds;

2. The known adhesion of paint coatings to wood, modified the received contents - 1 point;

3. The composition at the rate of 0.06 kg/m2is biostable against wood-destroying fungus Coniophora Cerebella;

4. The composition is not corrosive and does not reduce the strength characteristics of the wood;

5. The composition withstands ambient temperatures up to -30°C.

The composition was applied by brush in three layers with a flow rate of 0.1-0.3 kg/m2on the sample surface prjamoslojnoj air-dried pine wood size 30×60×150 mm, humidity 8% with intermediate drying for at least 30 minutes. Assessment of property freezing was performed visually in a freezer at temperatures environment

-30 and -31°C. the properties of the composition shown in which the GLA. 1-3.

Fire-retardant effectiveness of the composition was evaluated according to GOST 12.1.044-89, antiseptic properties - on the aggressive culture of wood-destroying fungus Coniophora Cerebella according to GOST 30028.4-93; adhesion of coatings (paints Pesto, Miralkid, Unica Super /Tikkurila/and varnishes Bootsklarlac /Meffert Ag/ method of lattice cuts on GOST 15140-80; survivability of structures - visually to bundle structures (maximum duration of test 3 years). From table. 1-2, it follows that the resulting composition can improve the resistance of wood to the fire and bioporazheniya without being corrosive and without reducing the strength characteristics of wood. In addition to modified this part of the wood you can apply any paint finish. From table. 3 shows that the resulting composition is capable of withstanding ambient temperature to -30°With; at a temperature of -31°With reduced mobility composition and begins its partial crystallization.

Sources of information

1. Patent 674903 (USSR). Composition for protecting wood from decay and fire. /Sosin S.L., Pokrovskaya E.N., Nikiforova, ETC, Laparsky LO, Michalova GN. Declared 23.03.78.

2. Patent 737212 (USSR). The drug to protect the wood from decay and fire. /Gorshin S.N., N.A. Maximenko Stated 07.07.78.

3. Patent 1810283 A1 (USSR). The composition for ognebiozaschity wood. / Pokrovskaya E.N., Nikiforova, ETC, Belle is ova YEAR, Michalova GN. Declared 07.02.91.

4. Patent 2011512 (Russia). Biogateway composition for wood. / Pokrovskaya E.N., Nikiforova, ETC, Makovsky UL, Sidorov V.I. Stated 25.11.91.

5. Patent 2061589 (Russia). The composition for fire - wood and biosecurity (options). / Mikhailov V.I., Semliki V.E., V.A. Kiselev Stated 23.04.93.

The composition for fire - wood and biosecurity containing dimethylphosphite and dimethylformamide, characterized in that it additionally contains starch, phosphoric acid, amyl alcohol, maleic acid, ethylene glycol and water in the following ratio, wt.%:

Starch 4,13-5,0

Phosphoric acid 18,36-20,0

Amyl alcohol 2,0-3,0

Dimethylphosphite 23,58-24,08

Dimethylformamide 15,07-16,03

Maleic acid 4,15-5,04

The glycol 15,67-18,0

Water the rest



 

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