Fungistatic substance

 

(57) Abstract:

The invention relates to the protection of building materials and structures from biodegradation by microscopic fungi. For expanding the resource base of receipt of fungistatic substances, reduction of toxicity, cost, and efficiency actions, as well as expand the market by the waste industry as a fungistatic substance use salt of caprolactam General formula

< / BR>
where n = 1-5 and X-the acid anion Cl-; NO-3, HSO-4. Production of fungistatic substances simple, does not require scarce, expensive solvents and components, the degree of biostability treated them with high-quality products. table 2.

The invention relates to the protection of building materials and structures, flooring products, equipment and structures from biodegradation by microscopic fungi.

As fungistatic or fungicidal substances used various classes of organic compounds.

Known fungistatic substance which protects the construction materials from damage by microorganisms in the conditions of operation, such as o-h is W hen fell sharply, the effectiveness of their practical usage is low, the selectivity is high, many of them have not been mastered by the industry, and, for example, pyrocatechin requires expensive solvents such as ethyl alcohol.

In addition, some of the above fungistatic substances initially toxic to the environment and humans.

At the same time, the majority of the building materials and, in particular, on the basis of gypsum, phosphogypsum, chitragupta and others, as well as the most used technique in polymer materials and coatings (LCR) do not have sufficient decay resistance and are easily damaged by microscopic fungi such as As. niger and other

These lesions cause irreversible structural changes in the materials and further lead to loss of strength and destruction.

It is known that when operating in conditions of high humidity and temperature of the gypsum product is particularly often affected by microscopic fungi. And this, in turn, affects the ecological situation in the buildings, the surface of the products covered by spots, the material becomes loose and destroyed.

Therefore, the research problem fungistatic substances shall Britanie aimed at finding substances not toxic to the environment and humans, cheap, affordable, effective for use as a fungistatic substances, as well as expand the market technogenic waste industry.

This is achieved by apply salt caprolactam derivatives of General formula

< / BR>
where n=1-5, X-anion of a mineral acid (Cl-, NO3-, SO3-as fungistatic substances.

The salt derivatives of the caprolactam obtained by acid modification of the still bottoms from the distillation of the caprolactam (MCTC) [2] are dense homogeneous mediobrunneus mass, capable of a long time not to crystallize, with density 1325-1357 kg/m3and the electrical conductivity (1,5-3,2)10-31/OSM, soluble in water.

Thus, it is proposed the use of a known substance for a new purpose.

To use salts of derivatives of caprolactam (MCTC) as a fungistatic substance is prepared from 0.05 to 10% aqueous solutions, the water temperature should be not less than 50oWith and carry out the application of surface structures, products of gypsum, phosphogypsum, chitragupta and others who Yessei directly with the mixing water.

Penetrating into the pores, the surface roughness of structures and building materials, salt derivatives of caprolactam during cooling clog them, protecting the surface as the external and internal from the biodegradation of microscopic fungi and their spores. In addition, studies have shown that with the introduction of MCTC in the construction mixture, for example of plaster, chitragupta, phosphogypsum and other, they increase the coefficient of giprostoymost (Kg), the ratio of the strength of the samples in compression, stored in water, and the strength of the samples stored in air-dry conditions, and thereby prevent the penetration of water in the finished product, and thus increase their giprostoymost.

First proposed the use of salts of derivatives of caprolactam as a fungistatic substance, thus the proposed solution has the criterion of "novelty".

The absence in the patent and scientific literature on this and related fields of technology the same or similar to the technical nature of solutions, and that first discovered previously unknown properties of salts derived caprolactam, allowing them to use as fungistatic substances, results in the este fungistatic substances salt derivatives of caprolactam in the indicated concentrations inhibit the development of viable (active) microgroove, previously identified in the operating conditions, and prevent their development in the case of repeated contact of spores or mycelium on the surface of the structure. The trial offer and other known substances was carried out on a mixture of strains of fungi, identified and deposited with the collection of cultures INMN the Russian Academy of Sciences by well-known methods [3].

Comparative data on the effectiveness of the proposed and known substances in points (percent) growth of microscopic fungi are shown in table 1.

From table 1 it follows that we offer as a fungistatic substance salt derivatives of caprolactam (MCTC) have a high biocidal efficacy.

In addition, it was held biotesting extracts of materials with additives MCTC and known substances of different concentrations, to determine the toxicity of their actions on the environment.

To determine the toxicity of building materials with the addition of fungistatic substances known and proposed as a test object were selected Daphnia species Daphnia Magna Straus.

Aqueous extract of samples of building materials treated with a fungistatic substances were filtered and the filtrate was placed a t gibet, the material is considered toxic. The results of the biological testing are presented in table 2.

As follows from table 2, used as a fungistatic substance salt derivatives of caprolactam (MCTC) is not toxic to the environment. Use in the industry, we offer salt derivatives of caprolactam will reduce environmental tensions in the region, will effectively protect building materials from biodeterioration.

In addition, the proposed fungistatic substance produced from waste products of caprolactam, so its cost is much lower than the known. Production of fungistatic substances simple, does not require scarce, expensive solvents and components, and the degree of biological products, processed data fungistatic substance is high, which is consistent with the objectives of the present invention.

Thus, we offer a fungistatic substance allows to expand the raw material base, to refuse deficient, toxic materials, it is cheap, domestic, and can solve the environmental problem of the region for disposal of industrial waste, expanding their market.

The use of salts of product3-, HSO3-)

as fungistatic substances.

 

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