CS260924B1 - Alkaline cleaning and disinfectant - Google Patents

Abstract

Alkaline cleaning and disinfecting agent containing 5 to 10 wt. % alkali metal hydroxide, 1 to 10 wt. % alkali metal polyphosphate, 15 to 30 wt. % alkali metal silicate and a compound with active chlorine in an amount corresponding to 1 to 10 wt. % active chlorine in an aqueous solution. This agent is suitable for washing equipment for primary milk production and dairy lines.

Description

The invention relates to an alkaline cleaning and disinfecting agent for comprehensive cleaning and disinfection of containers, machine parts and equipment for primary milk production and dairy lines.

A number of cleaning, disinfecting and complex preparations are known (J. Doležálek in the book Microbiology of the Dairy and Pig Industry, SNTL, Prague 1962; S. Hrubý et al.: Microbiology in Nutritional Hygiene, Avicenum, Medical Publishing House, Prague 1984; L. Kratochvíl: Dairy Industry, supplement to the magazine Náš chov 9/85-1). These are cleaning, disinfecting and combined preparations. The purpose of their use is to remove mechanical impurities (milk residues), but especially to significantly reduce the contamination of milk with undesirable pathogenic microorganisms.

As simple alkaline cleaning agents, alkali metal hydroxides and soda ash are used, as acidic agents - nitric, phosphoric or sulfuric acid. Complex (combined) agents have both a cleaning and degreasing effect, as well as a disinfectant effect. In addition to cleaning components (sodium hydroxide, surfactants), they also contain disinfectant components, mostly based on active chlorine, iodine and quaternary ammonium salts.

In many cases, these are highly effective products, but they have some shortcomings, e.g. they contain expensive and scarce chemicals, have an adverse effect on the environment, corrode the cleaned equipment and require certain safety measures from a work safety perspective.

The above disadvantages are eliminated by the alkaline composition according to the invention, which contains 10 to 20% by weight of approximately 50% alkali metal hydroxide solution, 15 to 30% by weight of alkali metal silicate, 1 to 10% by weight of alkali metal polyphosphate and a compound with active chlorine in an amount corresponding to 1 to 10% by weight of active chlorine. This composition may further contain 0.1 to 10% by weight of sodium or potassium carbonate, 0.1 to 2% by weight of anionic or ionogenic surfactant, 0.3 to 5% by weight of a defoamer based on silicone oils and 0.1 to 1.5% by weight of complexing agents or water. This alkaline cleaning and disinfecting composition according to the invention facilitates cleaning by easily dissolving or emulsifying and suspending fats, proteins and minerals. The agent is made up of alkaline components consisting of alkali metal silicate, alkali metal hydroxide, alkali metal carbonate or a mixture thereof, polyphosphates, surfactants, complexing agents and compounds with active chlorine. Alkali metal silicates (sodium, potassium or a mixture thereof) serve to neutralize acidic contaminants, suspend fine particles in the washing solution, and inhibit corrosion, especially of non-ferrous metals.

They are contained in the formulation of the agent in 15 to 30% by weight. Alkali metal hydroxides neutralize acidic components and convert them into water-soluble compounds or into a dispersion form. Alkali carbonates act similarly and, because they are cheaper, they allow a reduction in the price of the product. Polyphosphates help stabilize aqueous solutions, emulsify particles and have significant inhibitory properties, especially against corrosion of ferrous metals. Tri-, tetra- or hexametaphosphate or their mixtures are preferably used in an amount of 1 to 10% by weight. Ethylene-oxidized amines or alcohols containing 8 to 18 carbon atoms and 5 to 20 ethylene oxide units or alkylarylsulfonic acids or their salts with 8 to 12 carbon atoms in the alkyl residue are used as surfactants. Compounds with active chlorine represent a heterogeneous group in which sodium hypochlorite occupies a significant position, others such as chloramines or derivatives of chloroisocyanuric acid are less advantageous from a chemical point of view. They are used in such an amount that the resulting preparation contains 1 to 10% by weight of active chlorine. Complexing agents in the preparation are sodium gluconate, which disperses fats and removes fine particles, sodium salt of ethylenediaminetetraacetic acid softens water, stabilizes the solution, ethylidene-1-hydroxy-1,1-diphosphonic acid significantly complexes calcium and magnesium salts and at the same time acts as a corrosion inhibitor for non-ferrous metals. In some cases, it is necessary to add 0.3 to 5% by weight of a defoamer based on polysiloxanes or alkylbenzenes with 8 to 12 carbon atoms in the alkyl. It is used as a comprehensive agent for degreasing, cleaning and disinfecting containers, machine parts and equipment for primary milk production and dairy processing plants. It is highly effective for removing milk residues (milk fat, proteins, minerals) and unwanted pathogenic microorganisms, especially coliforms.

The alkaline cleaning and disinfecting agent according to the invention uses readily available and inexpensive agents and exhibits high cleaning and disinfecting efficiency. A significant improvement in the cleaning and disinfecting efficiency of the alkaline agent is achieved by periodically alternating it with an acidic cleaning and disinfecting agent after individual work cycles.

The aforementioned alkaline cleaning and disinfecting agent is diluted with safe water, preferably demineralized, before use in a ratio of 0.5 l of the agent to 50 to 150 l of water, preferably 0.5 l of the agent to 100 l of water, and the cleaning is carried out at a temperature of 40 to 60 °C for 10 to 20 minutes. After draining the solution, the cleaned part is washed with lukewarm water (20 to 30 °C) for 10 minutes.

The following specific examples of the formulation of an alkaline cleaning and disinfecting composition do not limit the scope of the invention in any way.

Example 1

Alkaline cleaning and disinfectant composition:

100 g potassium tetrametaphosphate 15 g approx. 50% sodium hydroxide g potassium carbonate 20 g sodium hydroxide (approx. 30% solution) g demineralized water g alkylarylsulfonic acid containing 8 to 12 C in the alkyl g ethylene oxide acid C _{12 and} js with 2 to 10 ethylene oxide units g polysiloxane g etindronic acid

Example 2

Alkaline cleaning and disinfectant g Sodium tripolyphosphate 20 g 50% potassium hydroxide 25 g potassium water glass g sodium salt of trichloroisocyanuric acid 10 g disodium salt of ethylenediaminetetraacetic acid.

g ethylene oxidized amine Cg u ⁸ 5 to 20 ethylene oxide units 35 g water

Example 3

Alkaline cleaning and disinfectant g Sodium hexametaphostat g 50% sodium hydroxide g sodium water glass g sodium chloramine p-toluenesulfonamide g sodium gluconic acid 31 g water

The advantage of the newly formulated product according to the invention was demonstrated based on comparisons with existing products in both laboratory and operational conditions. The evaluation of the products used a methodology approved by OSVO (Central Administration of Veterinary Institutes)

Prague, for verifying the effectiveness of cleaning and disinfecting agents in the sanitation of machinery in agricultural and food production facilities. The effectiveness was assessed by the plate diffusion method (the size of the attenuation zone from the edge of the applied agent to the beginning of germ growth was assessed). At the same time, determinations from operational trials (stable conditions) were carried out on DZ 100 type machinery for a period of 4 weeks. The effectiveness was examined by the rinsing method and the number of germs was determined before and after cleaning and disinfection. The effectiveness of the individual agents used is expressed in % of germ loss (see Table 1). The assessment of the presence of coliform germs (fecal contamination) is assessed from the number of samples. The values obtained are given in Table 1.

Chemical stability of the preparation.

From the chemical stability, the stability of the product was evaluated for the content of the active substance (active chlorine) and the change in pH under operating conditions. The overview data is included in Table 2. Furthermore, the corrosivity of materials (rubber, glass, wood, brick, concrete, iron, aluminum, paints, residues in milk and tissue toxicity were monitored. All the values listed comply with the current standards. Wastewater is also non-toxic to all commonly used test strains of protozoa after 10-fold dilution. The product is therefore also harmless from an ecological point of view.

Table 1

Comparison of the effectiveness of cleaning and disinfectants

Name of the pro- % used % loss Number germs Number of subscriptions Efficiency means workplace germs microorganisms with the content of disinfection solution in milk after in milk after de- form germs- by the fence disinfection sinfecoi september- in milk after new methods ment disinfection of equipment from a total of 4 collections you a) b) Alkaline agent example 1 0.5 97.8 1 325 0 3 Acidic agent 0.25 Alkaline agent example 1 0.5 89.6 2 035 0 Alkaline agent example 2 0.5 82.3 1 672 1 Alkaline agent example 3 0.5 . 81.3 2 239 1 Demyro A 0.5 93.2 3 425 , 2 3 Demyro A 0.5 97.8 3 425 2 3 Demyro K 0.5 Agrosan A 1.0 89.6 2 828 1 2 Agrosan A 1.0 95.75 2 650 1 2 Agrosan K forte 0.25 Milkon 0.3 56.0 175 250 4 3 Alkon Z-4 2.0 40.24 124 350 2 4

Explanations to Table 1

a) - determined from four samples, 0 means they were not present, 1 means that out of four samples, one sample was positive

b) - the assessment is expressed by the relative size of the attenuation zone after application of the product

Composition of individual preparations:

The acidic agent contains phosphoric acid, arenesulfonic acid, surfactant based on ethylene-oxidized amines, alcohols, phenols or alkylbenzene acids

Demyro A - composition sodium hypochlorite, sodium hydroxide, pentasodium triphosphate, hydrogen peroxide, etoxone EPA

Demyro K - phosphoric acid

Agrosan K - composition alkaline agent with active chlorine

Agrosan K forte - phosphoric and sulfuric acid

Milkon - not available

Alkon Z-4 - sodium methasilicate, target. sodium phosphate, chloramine and wetting agents

Table 2

Chemical stability of the products

Means Active chlorine in g/kg % decrease 0 day pH 30 days 60 day % decline The day 30 days 60 days Alkaline agent according to the invention 31.7 31.5 29.8 6.0 11.80 11.75 11.25 4.8 Demyro A 52.00 48.4 41.2 20.8 11.50 11.50 11.20 2.6 Agrosan A 17.6 15.8 14.3 18.7 11.75 11.55 11.30 3.8 Milkon ^and 83.5 82/0 81.2 2.8 10.50 10.35 10.10 3.8 Alkon Z-4 ^and 20.1 20.1 20.2 0 11.80 11.60 11.55 2.7

a) Milkon and Alkon Z-4 are powder products

Claims (9)

PREFACE YOURSELF An alkaline cleaning and disinfecting agent based on alkali metal hydroxides and polyphosphates and compounds with active chlorine, characterized in that it contains 5 to 10 wt. % alkali metal hydroxide, 1 to 10 wt. % alkali metal polyphosphates, 15 to 30 wt. % of an alkali metal silicate and a compound with active chlorine in an amount corresponding to 1 to 10 wt. of active chlorine in aqueous solution. * 2. A composition according to claim 1, wherein the polyphosphate is an alkali metal tripoly-, tetrametha- or hexamethaphosphate. 3. A composition according to claim 1 comprising from about 0.1% to about 10% by weight of the composition. sodium or potassium carbonate. 4. A composition according to any one of claims 1 to 3, wherein the active chlorine compound is an alkali metal hypochlorite or chloramine or a chloroisocyanuric acid derivative. 5. The composition of items 1 to 4; %, characterized in that it contains 0.1 to 2 wt. an anionic or nonionic surfactant. 6. A composition according to any one of claims 1 to 5, wherein the anionic surfactant is a surfactant based on arenesulfonic, alkanesulfonic or alkanesulfonic acid salts. 7. A composition according to any one of claims 1 to 6, wherein the nonionic surfactant is an ethylene oxidized amine or an alcohol having a carbon number of 8 to 18. 8. A composition according to any one of claims 1 to 7, wherein an antifoaming agent based on polysiloxane or C8-C12 alkylbenzenes is added. 9. A composition according to any one of Claims 1 to 8, comprising 0.1 to 1.5% by weight of the composition. a complexing agent such as sodium gluconic or ethylenediaminetetraacetic acid or ethylidene-1-hydroxy-1,1-diphosphonic acid.