RU2236428C1 - Composition for coating disinfecting indoor air - Google Patents

Abstract

FIELD: disinfectants.

SUBSTANCE: invention provides composition for coating disinfecting indoor air and protecting underlayer materials against biological damage. Composition comprises chlorosulfurized polyethylene, polyhexamethyleneguanidine, water, organic solvent, and dialkylphosphoric acid. Composition may further contain 0.1-0.3% sodium silicate. Composition is prepared by dissolving polyhexamethyleneguanidine in water, treating resulting solution with sodium silicate and admixing solution of chlorosulfurized polyethylene and dialkylphosphoric acid in organic solvent.

EFFECT: increased concentration of polymeric substances in solution and increased its shelf time.

3 cl, 5 tbl

Description

The invention relates to polymer compositions for coating on the basis of chlorosulfonated polyethylene and polyhexamethylene guanidine, which disinfects indoor air and protects materials, such as wood, coated with this varnish from biodeterioration.

Known coatings for protecting materials from biocorrosion and biodeterioration in air and water, including polyhexamethylene guanidine and a crosslinking agent [Vointseva II et al. Auth. USSR certificate No. 1728264, MKI C 08 L 15/02, publ. 1992]. The closest analogue of the invention is a polymer composition for coating with bactericidal action, including 10-75 parts by weight polyhexamethylene guanidine and 90-25 parts by weight polymer (cross-linking agent): chlorinated or chlorosulfonated polyethylene (CSPE) or epoxy resin [Vointseva II and other RF Patent No. 2055844, MKI C 09 D 123/28, publ. 10.03. 1996].

The disadvantage of the prototype is poor solubility or emulsifiability, as a result of which solutions with a concentration of the polymer composition of less than 5% are used for application. When storing this composition, active substances are released in the form of a precipitate, which complicates its use.

An object of the present invention is to provide a composition for coating, disinfecting indoor air, with an increased concentration of polymeric substances and increasing its storage stability, for example, obtaining a composition containing more than 17% of film-forming substances.

This goal is achieved by using a polymer composition comprising polyhexamethylene guanidine and ChSPE, additionally containing dialkylphosphoric acid and, possibly, sodium silicate.

The essence of the invention lies in the fact that polyhexamethylene guanidine forms organosoluble compositions with chlorosulfonated polyethylene in the presence of dialkylphosphoric acids. To obtain such compositions, an aqueous solution of a salt of polyhexamethylene guanidinium, for example, chloride, is treated with alkali, the polymer layer is separated and treated with a solution of ChSPE in an organic solvent with the addition of dialkylphosphoric acid.

It was also unexpectedly found that if the alkali in this process is replaced with sodium silicate, then it is possible not to separate the aqueous phase from the resulting polyhexamethylene guanidinium base. If the reaction product of the salt of polyhexamethylene guanidinium and sodium silicate in an aqueous medium is acted upon by dialkylphosphoric acid and a solution of ChSPE in an organic solvent, an aqueous emulsion system is easily formed, convenient for application and stable during storage. When this composition dries, a waterproof, transparent biocidal film is formed. Sodium silicate in the marketable form of liquid glass is cheaper and more convenient to use than caustic alkali solutions.

Below are examples of the preparation and possible use of the composition, but not exhaustive of all possible options. Chloride or phosphate, as well as other water-soluble salts, can be used as water-soluble salts of polyhexamethylene guanidinium.

Examples 1-5. Using commercially available substances: polyhexamethylene guanidinium chloride (PHMHH) according to TU 9392-001-32963622-99 of the formula Н ₂ N - [(СН ₂ ) ₆ -NH-C (= NH · HCl) -NH] _n , where n = 30 -60, and a solution of HSPE in the oil solvent: KhP-734 varnish according to TU 6-00-5763450-82-89 (the content of film-forming substances is 15.1%) to obtain a composition for coating that retains biocidal properties for at least 18 months after application. A process carried out at room temperature without additional heating includes:

1. Solid PHMHC was dissolved in water to give a 40% solution.

2. To the solution according to claim 1, an amount of sodium silicate Na ₂ O · 3SiO ₂ · 20H ₂ O (according to GOST 13078-81), equimolar with respect to the bound hydrogen chloride, is added with vigorous stirring to obtain a stable emulsion.

3. In the serial varnish HP-734 according to TU 6-00-5763450-82-89 add 2-7 wt.% Di-2-ethylhexylphosphoric acid.

4. In the solution according to claim 3, the emulsion according to claim 2 is gradually added with vigorous stirring.

A homogeneous storage varnish is formed.

The content of non-volatiles is at least 17%.

When using aqueous solutions of PHMHH with a concentration of less than 35%, the resulting emulsions do not possess the necessary resistance.

Table 1 shows the compositions of the present invention, obtained in accordance with the above methodology.

Table 2 shows the formulation of the examples 6-13 obtained in two stages. 1) PHMHC is transferred to the base by treatment with equimolar (relative to the hydrogen chloride contained in the PHMHH) amount of sodium hydroxide and the upper layer (separated NaCl solution) is decanted; 2) the lower layer (wet base PHMG) is dissolved in isopropanol and mixed with varnish KP-734 and dialkylphosphoric acid. Along with isopropanol, other lower alcohols can also be used.

In these examples, in the first stage, a 40% solution of PHMHC is treated with a 10-50% solution of NaOH or KOH. As a result of the reaction, the lower layer (25-30% of the mass of the reagents used) is separated, which is the target product and is an irrigated (35-55% water) polymer in which partial replacement of Cl ^- ions by OH ^- (PHMG) was carried out. The degree of substitution of Cl ^- in the starting polymer ranges from 60-70%. Get the composition by mixing the components shown in table 1A.

Table 2 shows the data on the final composition of the compositions.

Along with di-2-ethylhexylphosphoric acid, other phosphoric acid esters such as dibutyl phosphate or didodecyl phosphate can also be used. Instead of polyhexamethine guanidinium chloride, other available salts, for example phosphate, can be used.

This composition, which has received the INTERCID-F trademark, can be used to suppress bacterial microflora in the atmosphere, to disinfect water with the walls of a vessel covered by a patented composition, to protect wood from decay, to prevent the formation of mold in damp rooms, etc.

The use of the composition to suppress bacterial microflora in the atmosphere.

To determine the effectiveness of the bactericidal action of the composition in air, plates were made (plastic 50 × 70 mm in size was used), on one side of which the patented composition was applied according to examples 1-13. The coverage area is 35 cm ² . Staphylococcus aureus (Staphylococcus aureus) was used as a test culture; the holding time was 60 minutes.

The results are presented in table 3. On the control plate was applied varnish KP-734.

From the data of table 4 it can be seen that all the studied compositions are effective for suppressing bacterial microflora in the atmosphere. In addition, we can conclude that the coating has 100% biocidal efficacy for Staphylococcus aureus in air, if the concentration of PHMG in the dried coating is at least 3%.

Thus, if the composition of the present invention is applied to the walls of the room, air disinfection will occur. The effect is long lasting. An experiment was conducted, which lasted 18 months, in which the walls of the room, in which there was constantly a large crowd of people, were varnished according to Example 10 with a flow rate of 100 g / sq.m. Throughout the test period, bacterial contamination of the walls was determined monthly. It was found that the concentration of pathogenic microflora on the walls of the room was not more than 1% of the level of pollution in a similar room without a corresponding coating on the walls.

With increased hydrophobicity, this drug is especially effective against microorganisms coated with a wax coating and spores. It effectively destroys mycobacterium tuberculosis, gonococcus and Trichomonas.

Varnish can be effectively used when carrying out repairs in maternity and surgical departments of hospitals, tuberculosis sanatoriums, and other places of crowded people and animals.

The use of a composition for disinfecting water with the walls of a vessel.

To study the disinfecting effect in water, three stainless steel plates 100 × 400 mm in size were made. The composition according to examples 7 and 13 was applied to two of them on both sides (coating area 2 × 400 cm ² ). Samples and control (uncoated plate) were placed in water tanks and the total microbial number (TBC) and colonies forming elements were determined (CFU) on days 0, 3, 7, and 11 in water (table 5) and in flushes from the walls of tanks and from plates (table 6).

From the obtained data it is seen that the patented composition effectively disinfect water (table 4) and works against biofouling of surfaces in contact with water (table 5).

Unlike known materials, the proposed composition is able to provide long-term disinfection of rooms in which people or animals are constantly at any humidity level. The coating does not emit any toxic substances into the atmosphere, and due to its hydrophobic properties it also protects underlying building materials (plaster, paint, wallpaper) from premature destruction caused by aging of materials or their biological damage.

Claims (3)

1. Composition for a coating that disinfects indoor air and protects materials from biodeterioration, including chlorosulfonated polyethylene, an organic solvent, water and polyhexamethylene guanidine, characterized in that it additionally contains dialkylphosphoric acid in the following ratio, wt.%: Chlorosulfonated polyethylene 9.7 ÷ 14.1  Polyhexamethylene guanidine 0.6 ÷ 3.1 Dialkylphosphoric acid 2.0 ÷ 7.3 Water 0.3 ÷ 12.2 Organic solvent Else 2. The composition according to claim 1, characterized in that it further comprises sodium silicate in an amount of 0.1-0.3 wt.%. 3. The method of obtaining a composition for coating, disinfecting indoor air, according to claim 2, which consists in the fact that the salt of polyhexamethylene guanidine is dissolved in water, the solution is treated with sodium silicate and the resulting composition is mixed with a solution of chlorosulfonated polyethylene and dialkylphosphoric acid in an organic solvent.