Means for biosecurity of cellulose-containing materials

 

(57) Abstract:

The invention relates to means for biochemical protection of cellulose-containing materials from blue stain fungi and mildew and can be used in sawmills and woodworking industry. As bioprotectant funds proposed to use alkylbenzenesulfonic structural formula

n

The invention relates to an organic origin, which are used for biochemical protection of cellulose-containing materials from blue stain fungi and mold wood during atmospheric drying or transportation with humidity above transport, and can be used in sawmills and woodworking industries.

Known means of an organic origin for wood protection in the form of pentachlorophenol sodium (PFN) [1].

This tool has the following disadvantages:

- has low penetrating power; it is adsorbed at a depth of 0.5 mm, and thus does not destroy the fungi that penetrate deeply into the wood;

- requires the use of special and individual protective means, because it is toxic for people and the environment (against the tion.

Also known means of organic origin, which has bioprotectant property with respect to cellulose-containing materials, in the form of 4,5,6-trichloroanisole [2].

This tool has a wide range of actions, but belongs to the category of very toxic substances; concentrated solutions of this tool, in contact with skin causes severe burns, dilation of blood capillaries and smooth muscle contraction. Use this connection in a very limited way.

The closest analogue to the described invention and accepted by the applicant as a prototype, is a famous tool of organic origin on the basis of Quaternary ammonium compounds and amines, in particular alkyldimethylbenzylammonium having the structural formula

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where R is a saturated hydrocarbon radical of normal structure containing 10-18 carbon atoms [1].

The substance of the prototype refers to surface-active substances (surfactants) and get it by condensation alkyldiphenylamine and benzylchloride. Alkyldimethylbenzylammonium able to adsorb from aqueous solutions on the surface of separation of the phases (solid - liquid) ilen structure, includes polar functional hydrophilic group and a nonpolar hydrocarbon radicals.

A disadvantage of the known tool is that it has a low permeability of the wood capillaries (molecular solubility it is small and the surface tension of the aqueous solution is relatively high). Preservation of samples of softwood and hardwood sapwood part against derevookrashivayuschie and fungi after exposure to 50 days is not higher than 70%. This tool shows mainly bacteriostatic action; delay the development or reproduction of microbes. Connection-toxic, refers to the substance of the second hazard class (aqueous solutions it have skin irritation and severe skin-resorptive effect, causing dermatitis).

Features connection for biosecurity of cellulose-containing materials, which are soluble in water and has simultaneously bactericidal and fungicidal properties against derevookrashivayuschie and wood-destroying fungi blue stain and mould. Its activity is not reduced in time, it is less safe for humans and the environment than the tool prototype. The proposed connection is Manihari, having the structural formula

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Technology industrial synthesis of the proposed tools for biosecurity of cellulose-containing materials includes condensation of the alkylamine and benzyl chloride. The process goes through the following reactions:

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Along with the main reaction have side

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Process conditions: temperature of 140-150oC, a pressure of about 1.6 MPa, a molar ratio of amine to ClCH2C6H5is 3:1 and the duration of reaction 3-4 hours

The final product is a mass in the form of a clear solution, which on cooling to 20oC was turned into a pasty mass from yellow to reddish in color.

In the production process of alkylbenzenesulfonic the loss is not more than 0.3%.

Identification of industrial designs proposed connection carried out by the method of infrared spectroscopy instrument Perkin Elmer 1720 by well-known methods.

The spectrum suggests the presence of an amine salt, as evidenced by the presence of bands of stretching vibrations of the ammonium group in the area of the absorption bands 2800-2200 cm-1and the deformation vibration bands in the area 1642 cm-1.

On spectramedi spectrum data allow to conclude that, the formula proposed bioprotectant means for cellulose-containing material

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according to the final product of the synthesis.

Alkylbenzenesulfonic has the following quality indicators:

The aggregate state is homogeneous pasty mass from yellow to a reddish color, and, at the 50oC turns into a liquid.

The content of basic substance, %, not less - 48-50

Molecular weight of 346-376

The density of the solution, g/cm3- 0,96-0,97

Viscosity, SP, at 20oC - 140-150

the pH of the aqueous solution - 6,6-7,0

The content of impurities resins, %, not less than - 3

The content of the hydrochloric salt of the secondary amine, no more than 1.2 to 1.5

The contents of a simple ester, %, not more than - 3

The content of the tertiary amine,% max 0.5

The critical concentration of micelle formation - 0,065

The iron content of not more than 0,001

Surface tension, Dyne/cm 32-35

Foaming ability in Ross-miles, mm - 200

Refractive index - 1,429-1,431

The auto-ignition temperature,oC - 356

FlashoC - 95

Toxicity LD50for white mice, mg/kg wet weight - 350

The proposed solution has the following properties:
the tool provides instant bioprotective action, and known - prolonged;

- by reducing the surface tension of an aqueous solution permeability of wood is increased to 3 microns;

- bioprotective means less viscous than the well-known, well-soluble in water, has bactericidal and fungicidal action, and these properties do not change in time (activity steps on the wood stored up to 90 days with protection up to 98%);

means environmentally friendly, less toxic to humans than famous;

- applies to 2-hazard class;

- wood after treatment is not painted;

- physico-chemical properties of wood in time does not change and it is easily treated.

Bioprotective action of alkylbenzenesulfonic wood was studied as follows.

The tests were carried out in the laboratory on samples from the sapwood of pines.

Samples with a humidity of 80 - 120% and size HH (last dimension along the fiber length) was treated with (dipping method) impregnating the solution for 30 s

As a solvent used distilled water.

Samples treated bioprotectant medium spans the P CLASS="ptx2">

Infection of the samples was carried out by the method of dipping in a suspension of spores of the fungi grown in test tubes on wort-agar medium.

The samples were processed bioprotectant means and infected spore suspension with endurance in her 30 C. Then the sample is dried to their original moisture 80-120%, put in sterilized containers that have supported the moisture content at the primary level. On the 10th, 20th, 30th, 40th and 50th day conduct visual inspection and estimate the fouling of the surface samples derevookrashivayuschie and mold fungi in percent of the total area. In addition, the estimated distribution of bioprotectant tools section of the wood after impregnation.

It is revealed that the tool penetrates the sample to a depth of more than 5 mm, depending on the conditions of impregnation, and the distribution of its diffusion.

As control samples, the latter was impregnated by means of the prototype. The result is that the performance security of the sample surface through various much higher when the impregnation of the proposed tool than with the known impregnation (the prototype) under equal conditions studies.

Alkylenediamine is, the.E. can be used as a component of complex structures for the protection of cellulose-containing materials. The proposed tool is an effective and promising bio-protective compound against blue stain fungi and mold cellulose-containing materials.

Alkylbenzenesulfonic structural formula

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as biocidal protection of cellulose-containing materials from defeat them derevookrashivayuschie and mold fungi.

 

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