The method of obtaining an antiseptic for wood impregnation

 

(57) Abstract:

The invention relates to the preparation of wood materials in construction and can be used as impregnating antiseptic and biomagnetometer composition. The method includes the preparation of water-soluble drug containing diammonium phosphate, urea, and sodium fluoride. In the preparation additionally injected aqueous solution acetonitriles resin. A certain ratio of the components provides a high antiseptic and fire-retardant properties. table 2.

The invention relates to the production of antiseptics for wood impregnation. A method of obtaining antiseptics containing sodium fluoride and boric acid. Known drug FBC-211, which is obtained by mixing sodium fluoride, boric acid and soda ash /Lomakin, A. D. Protection of wood and wood-based materials. - M.: Forest industry, 1990. - S./ [1] .

The drug FBC-211 refers to moderately soluble antiseptical (its solubility at 20o- 10%), washed out of the wood. Get the drug by mixing the components at a mass ratio of sodium fluoride, boric acid and soda 2:1:1.

The disadvantage of this method averagecase capacity in wood and high toxicity of the finished product (the second hazard class standard /GOST 12.1.007-76. Harmful substances. Classification and General safety requirements. - M.: Publishing house of standards, 1977/ [2]).

The closest to the essence and the achieved result for the proposed method and adopted for the prototype, is a method of obtaining an antiseptic by dissolving in water drug DMF), including, wt.%:

DAP - 25-42

Urea - 25-42

Sodium fluoride - 16-50

/GOST 200228-82. Protection of wood. The classification. - M.: Publishing house of standards, 1982/ [3].

The disadvantage of this method is that when a good fire proofing properties, insufficient antiseptic, while increasing the proportion of sodium fluoride in the product increases the environmental risk impregnating compositions (second hazard class standard /GOST 12.1.007-76. Harmful substances. Classification and General safety requirements. - M.: Publishing house of standards, 1977/ [2] ).

The technical result of the invention is to improve the protecting ability of the antiseptic compositions without increasing concentrations harmful to humans and environmentally hazardous components.

The technical result is achieved by the fact that water-soluble product containing 42 wt.% of diammonium phosphate, 42 wt.% urea and 16 wt.% fluoride noszenia components, wt.%:

Water-soluble drug - 18

An aqueous solution acetonitriles resin brand ACF-3M-65 - 82

Oceanfarmasea resin produced domestic chemical industry in the form of 65%, 75%, 85% in water solutions.

In laboratory conditions for the expert evaluation of the proposed method of obtaining an antiseptic for impregnation of wood were prepared several compounds on the basis of DMF by dissolving it in water in accordance with standards /GOST 20022.2-80. Protection of wood. The classification. - M.: Publishing house of standards, 1980/ [4] and by the present invention by dissolving in the solution acetonitriles resin brand ACF-3M-65 /TU 64-11-11-88. Resin oceanfarmasea ACF-3M-65.- Samara, 1988/ [5].

In all examples, the drug DMF) had the same composition, wt.%:

DAP - 42

Urea - 42

Sodium fluoride - 16

Such ratios of components are selected based not dangerous fluoride sodium compositions prepared by dissolving the above-mentioned mixture to 18 mass percent in solutions acetonitriles resin brand ACF-3M-65.

Each of the compositions were tested to determine the biological stability and activity against derawar the illium.

The tests were carried out on samples svezhevypechennoj sapwood pine wood size: HH mm and 80 per cent humidity.

Samples were processed by immersion in impregnation solutions and was aged for 50 days in a humid chamber at a temperature of 202oC. during the experiment was carried out interim monitoring fouling fungi with an interval of 10 days from the moment of experience. Size of the fouling of the samples was expressed as a percentage of the total sample, and then determined the preservation of samples. The results of microbiological investigations are given in table 1.

Tests to assess the stability of the wood to the effects of fungi was carried out according to the standard /GOST 9.049-91. The polymeric materials and their components. - M.: Publishing house of standards, 1992/ [6] in the medium of čapek. For contamination of samples used pure cultures of fungi the most common genera Aspergillus and Penicillium. Funginertness materials was evaluated by the intensity of the development of fungi on the samples on a 6-point grading scale /GOST 9.049-91. The polymeric materials and their components. - M.: Publishing house of standards, 1992/ [6]. The test results showed a slight growth of fungi on the samples treated with the s-polymer and their components. - M.: Publishing house of standards, 1992/ [6] these samples can be estimated 2; 1; 0 - points.

According to the results of microbiological tests, we can conclude that the antiseptic compositions 3, 4, 5, prepared by the proposed method have a high antiseptic properties.

Part 2 provides a noticeable improvement antiseptic properties compared to the prototype (part 1).

Part 5 (dry mixture of DMF is dissolved in 6% solution ACF-3M-65) gives the maximum effect antiseptic properties, but gives greater long-term stickiness of the surfaces of the processed samples.

The best compositions are the compositions obtained by dissolving the dry mixture in DMF 2-4% concentration solutions ACF-3M-65. Thus, as shown by Toxicological tests in the selected limits of the ratios of components is reduced hazard class mixture from 2nd to 3rd. When conducting complex tests was found more positive effects of the compounds obtained by the claimed method, namely, fire-retardant properties.

Testing of flame retardant properties of wood impregnated obtained by the present method compounds and composition prototype, carried out by the method of "fire what we can conclude, that compounds 3, 4, 5, prepared by the proposed method have a high flame-retardant properties.

In this part 2 does not give a noticeable improvement compared to the prototype (part 1), quality neither the biological nor the fire resistance of wood.

Part 5 gives the maximum effect antiseptic properties, but gives greater long-term stickiness of the surfaces of treated materials.

The best compositions are the compositions obtained by dissolving the dry mixture in DMF 2-4% concentration solutions ACF-3M-65. Such compositions have good antiseptic properties and provide a second group of fireproof efficiency in double handling.

The increase of the protective effect of the claimed antiseptic, obtained by the claimed method is caused aimed comprehensive action acetonitriles resin.

Oligomeric macroeconomie connections that form the basis of resin, have independent antiseptic properties. In addition, have a theoretical basis the following factors:

- the presence in the resin of highly active hydroxyl and carbonyl groups increase the penetrating ability of a solution;
< who interact with methylol resin components;

- pulp of wood also gradually interacts with macroeconomi the oligomers;

- chemically active elements of wood are playing a role, acting as catalysts or initiators of polymerization processes and polioptila resins;

- resin ACF-3M-65 refers to non-combustible, inflammable substances, so her co-presence with diammonium phosphate and other flame retardants gives a synergistic effect and increases the fire resistance of the treated wood;

- at an elevated temperature of more than 100oWith the excess resin that have not come into contact with the active substances of the wood, as well as neoplasms otverzhdajutsja, turning into a nonflammable material. Fibres of wood, covered with a film of resin and its products neoplasms, after the cessation of flaming combustion is not smolder.

The combination of these and other possible processes and result in a noticeable intensification of antiseptic and flame retardant properties of the compositions obtained by dissolving a mixture of DMF solution ACF-3M-65.

Conducted by the applicant's analysis on scientific, technical and patent information sources helped to identify distinctive features in the claimed technical is P CLASS="ptx2">

In the detected information there is no information about the specified technical result and it is not detected the influence of individual characteristics on the achievement of a positive result. Therefore, this solution satisfies the criterion of "inventive step".

The criteria of the invention "industrial applicability" is confirmed by the fact that the proposed method of preparation of the antiseptic impregnation of wood-based solutions antonioalmeida resin brand ACF-3M-65 includes available produced by domestic industry substances and can successfully without increasing capital costs used in the industries for the preparation of wood materials in construction.

The method of obtaining an antiseptic for wood impregnation, comprising preparing a water-soluble product containing 42 wt. % of diammonium phosphate, 42 wt. % urea and 16 wt. % of sodium fluoride, characterized in that the preparation additionally impose 1-6% aqueous solution acetonitriles resin brand ACF-SM-65 in the following ratio, wt. %:

Water-soluble drug - 18

An aqueous solution acetonitriles resin brand ACF-SM-65 - 82

 

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3 tbl, 1 ex

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3 tbl, 2 ex

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1 tbl, 2 ex

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