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Title:
INORGANIC DISINFECTION ADDITIVE TO CONSTRUCTION MIXTURES AND SOLUTIONS, METHODS FOR ITS OBTAINING AND USAGE
Document Type and Number:
WIPO Patent Application WO/2006/050588
Kind Code:
A1
Abstract:
The invention relates to an inorganic disinfecting additive to construction mixtures and solutions, methods for its obtaining and usage, with application in the civil building and construction industry for environment protection, particularly for the disinfecting of surfaces in hospitals, residential, public, agricultural and other types of buildings and rooms either under construction or already built. The inorganic disinfecting additive as per the invention includes (in weight percentage): Mn+2 and/or Mn+4 from 1 to 50% and TiO2 - from 99 to 50%, as, based upon the photo-catalyst properties of the Titanium Dioxide (TiO2) and using Manganese (Mn+2 and/or Mn+4) as an active cation, 'charging' of the disinfected surface with active oxygen is obtained, prolonging the time for its discharge independently on the presence of light.

Inventors:
Stavrakev, Nedelcho Anastasov ("Sokolitsa" Str, No 57 block 1, entr, apt.17 4700 Smolyan, BG)
Astashkin, Sergey Nikolaevich ("Michurina"Str, 231 apt.2, Ekaterinburg 0, 62000, RU)
Application Number:
PCT/BG2005/000016
Publication Date:
May 18, 2006
Filing Date:
November 01, 2005
Export Citation:
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Assignee:
Stavrakev, Nedelcho Anastasov ("Sokolitsa" Str, No 57 block 1, entr, apt.17 4700 Smolyan, BG)
Astashkin, Sergey Nikolaevich ("Michurina"Str, 231 apt.2, Ekaterinburg 0, 62000, RU)
International Classes:
C04B14/30; C04B22/00; C04B28/02; C04B28/12; C04B28/14; C04B40/00
Foreign References:
GB998225A1965-07-14
US4022632A1977-05-10
Other References:
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 12 5 December 2003 (2003-12-05)
PATENT ABSTRACTS OF JAPAN vol. 018, no. 542 (C - 1261) 17 October 1994 (1994-10-17)
DATABASE WPI Section Ch Week 199837, Derwent World Patents Index; Class L02, AN 1998-430560, XP002371238
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Claims:
PATENT CLAIMS
1. Inorganic disinfecting additive to construction mixtures and solutions, containing Titanium Dioxide, characterised by the feature that it contains Mn+2 and/or Mn+4 at a ratio of the components in weight percentage: from 1 to 50% Mn+2 and/or Mn+4 and from 99 to 50% Titanium Dioxide.
2. Method for obtaining of inorganic disinfecting additive to construction mixtures and solutions, characterised by the feature that powdered Titanium Dioxide is activated with 0.1 to 1% strong alkaline solution, the obtained precipice is washed with clean water, after which solution of soluble salt of Mn+2 and/or Mn+4 is added to it in quantity of 1 to 10 weight %, as the thereafter obtained precipice, representing activated with Mn+2 and/or Mn+4 Titanium Dioxide is dried and from 1 to 50 weight % Manganese Oxide or Dioxide are added to it.
3. Method as per claim 2, characterised by the feature that Potassium Hydroxide or Sodium Hydroxide can be used as a strong alkali.
4. Method as per claim 2, characterised by the feature that Manganese Dichloride or Manganese Citrate can be used as a soluble salt of Mn+2.
5. Method as per claim 2, characterised by the feature that Manganese Disulphate could be used as a soluble salt of Mn+4.
6. Using of inorganic disinfecting additive to construction mixtures and solutions in a weight ratio from 0.01:1 to 0.5:1.
Description:
INORGANIC DISINFECTION ADDITIVE TO CONSTRUCTION MIXTURES AND SOLUTIONS , METHODS FOR ITS OBTAINING AND USAGE

Field of Technology

The invention relates to an inorganic disinfecting additive to construction mixtures and solutions, methods for its obtaining and usage, with application in the civil building and construction industry for environment protection, particularly for the disinfecting of surfaces in hospitals, residential, public, agricultural and other types of buildings and rooms either under construction or already built.

Previous technology status

Patent WO 9805601 is known, where the photo-catalyst system Titanium Dioxide (TiO2) is used as a hydraulic bond for cement construction mixtures, as additives such as Fe, Mo, Ru, Os, Re, V, Pt and others are used to improve its oxidation capability.

Patent US 005518992A is also known, describing the addition of TiO2, WO3 or Pt - TiO2 to construction mixtures for the inhibition of ALGAE growth on aquarium, swimming pools, drinking water tanks etc. walls.

A shortcoming of the above inorganic additives is that in the absence of light they lose their oxidation properties which limits and weakens their effect when used for disinfecting purposes.

Technical essence of the invention

The problem to be solved by this invention is to create inorganic additive to construction mixtures and solutions, which for a long period of time efficiently to disinfect surfaces on which there are conditions for the development of various organic disease-causing factors such as bio- agents and/or other organic precipitates.

This problem is solved by an inorganic disinfecting additive, which, based upon the photo-electric properties of the Titanium Dioxide (TiO2) and using Manganese (Mn+2 and/or Mn+4) as an active cation, "charges" the disinfected surface with active oxygen, prolonging the time for its discharge independently on the presence of light.

The composition as per the invention includes (in weight percentage ratios): Mn+2 and/or Mn+4 from 1 to 50% and TiO2 - from 99 to 50%.

Another object of the invention is a method to obtain the above mentioned inorganic disinfecting additive, ensuring stable presence of the Manganese cation (Mn+2, Mn+4), as well as its more even spread in the additive, according to which powder Titanium Dioxide (TiO2) is activated by 0.1 to 1% weight solution of strong alkali. The obtained as a result precipice is separated from the solution and is washed by clean water. Thereafter, from 0.1 to 10% (weight) solution of soluble salt of Mn+2 and/or Mn+4 are added to the precipice. The precipice thus obtained, representing Titanium Dioxide, activated with Mn+2 and/or Mn+4, is dried, after which from 1 to 50% weight Manganese Oxide or Dioxide is added to it.

As a strong alkali in the method as per the invention, Potassium Hydroxide (KOH) and Natrium Hydroxide (NaOH) could be used. The manganese cation (Mn+2, Mn+4) is exchanged with Na+ and K+ cations and becomes water-resistant.

Manganese Dichloride or Manganese Citrate could be used as a soluble salt of Mn+2.

Manganese Disulphate could be used as a soluble salt of Mn+4.

Another object of the invention is the application of the inorganic disinfecting additive to construction mixtures and solutions in a ratio from 0.01:1 to 0.5:1.

The disinfecting additive is mixed with the different construction mixtures and solutions in the above-mentioned ratio, after which the latter are treated and used in their usual and conventional manner.

The advantages of the inorganic disinfecting additive as per the invention are, as follows:

It is used to ensure efficient and lasting protection of various surfaces from the development of disease-causing bio-agents;

Decreases the need from constant cleaning and treatment with poisonous chemical preparations and solutions;

Its usage is simplified because it is easily mixed with various types of construction mixtures and solutions, which are thereafter used in the conventional and usual manner;

No permanent light is needed in order to separate the surface-disinfecting active oxygen.

Examples for the invention's execution

The following examples illustrate the invention without limiting its range.

Example 1

One kg of Titanium Dioxide with particle size of 0.001 μm is mixed at ambient temperature (20-25°) with 2 litres 0.1% (weight) Potassium alkali solution (KOH). After precipitation, the water solution is separated. The precipice is washed with clean water with continuous agitation, left again to precipitate again, and is separated from the solution. Two litres of 1% solution of Manganese Chloride (MnC12) is added with continuous agitation to the obtained activated Titanium Dioxide. The precipice, representing Titanium Dioxide activated with Manganese (Mn+2) is dried and, by agitation, 1O g of Manganese Oxide (MnO) is added to it.

Example 2

One kg of Titanium Dioxide with particle size of 0.003 μm, is mixed at ambient temperature with 2 litres of 1% (weight) solution of Potassium Alkali (KOH). After precipitation, the water solution is separated. The precipice is washed by clean water and with continuos agitation, precipitates again, and is separated from the solution. Two litres of 2% Manganese Sulphate (Mn/SO4/2) solution is added, by continuous agitation, to the obtained activated Titanium Dioxide. The precipice, activated with Manganese (Mn+4) Titanium Dioxide, is dried, and 100 g of Manganese Oxide (MnO) is added to it by agitation.

Example 3

One kg of Titanium Dioxide with particle size of 0.02 μm is mixed with 2 litres of 0.1% (weight) solution of Sodium Alkali (NaOH) at ambient temperature. The upper layer is separated after precipitation. The remaining precipice is washed by clean water, precipitates again and is separated from the solution, after which the precipice is mixed in 2 litres of 1% Manganese Sulphate solution. The obtained activated Titanium Dioxide is dried. 0.5 kg Manganese Oxide (MnO) is added to the obtained powder.

Example 4

One kg of Titanium Dioxide with particle size of 0.03 μm is mixed at ambient temperature in 2 litres of 0.5% (weight) solution of Potassium Alkali (KOH). After precipitation, the upper layer is separated. The remaining precipice is washed with water, precipitates again and is separated from the solution. Two litres of 0.2% solution of Manganese Chloride (MnC12) are added to the obtained activated Titanium Dioxide by continuous agitation. The thus activated with Manganese Titanium Dioxide is dried and 200 g of Manganese Oxide (MnO) is added to the obtained powder.

Example 5

One kg of Titanium Dioxide with particle size of 0.05μm is mixed with 2 litres of 0.1% (weight) solution of Sodium Alkali (NaOH) at ambient temperature. The upper layer is separated after precipitation. The remaining precipice is washed by clean water, after which it is mixed in 2 litre 1% solution of Manganese Citrate. The obtained activated Titanium Dioxide is dried. 50 g of Manganese Oxide (MnO) is added to the obtained powder.

Example 6

One kg of Titanium Dioxide with particle size of 0.005 μm is mixed at ambient temperature in 2 litres of 1% (weight) solution of Potassium Alkali (KOH). After precipitation, the upper layer is separated. The remaining precipice is washed with water, after which, by continuous agitation, 2 litres of 0.1% solution of Manganese Disulphate is added to it. The thus activated with

Manganese Titanium Dioxide is dried and 20 g of Manganese Oxide (MnO) is added to the obtained powder.

Examples for using the additive

Example 7

Ten kg of dry gypsum is mixed well with 0.2 kg of the additive, obtained as indicated in Example 1 and is stored for unlimited period of time. The further use of such dry disinfecting mixture does not differ from the conventional usage of gypsum.

It is recommended to be used for the processing (coating) of walls, ceilings, facades, ornaments, etc.

Example 8

Ten kg of cement is mixed well with 0.5 kg of the additive, obtained as indicated in Example 1, after which the mixture can be stored for unlimited period of time. The further use of such dry disinfecting mixture does not differ from the conventional usage of cement.

It is recommended to be used in the construction and maintenance of residential, industrial, agricultural and other buildings and rooms.

Example 9

Dry cement coating in a quantity of 20 kg is mixed with 2 kg of the additive, obtained as indicated in Example 3. After good mixing, the mixture can be stored for unlimited time or more especially until the cement coating shelf life. The manner of usage of such disinfecting mixture does not differ from the manner of usage of the coating without the additive.

It is recommended for corridors, wet rooms, etc.

Example 10

Dry gypsum mixture in a quantity of 20 kg is mixed with 1 kg of the additive, obtained as indicated in Example 4. After good mixing, the mixture can be stored for unlimited time or more especially until the gypsum mixture shelf life. The manner of usage of such disinfecting mixture does not differ from the manner of usage of the coating without the additive.

It is recommended for outside or inner walls, holls , living room , etc.

Example 11

Dry hydrated lime in a quantity of 20 kg is mixed with 10 kg of the additive, obtained as indicated in Example 5. After good mixing, the mixture can be stored for unlimited time or more especially until the hydrated lime shelf life. The manner of usage of such disinfecting mixture does not differ from the manner of usage of the coating without the additive.

It is recommended for outside or inner walls, agricultural buildings, livestock farms, etc.

Example 12

Dry cement coating in a quantity of 20 kg is mixed with 200 g of the additive, obtained as indicated in Example 6. After good mixing, the mixture can be stored for unlimited time or more especially until the cement coating shelf life. The manner of usage of such disinfecting mixture does not differ from the manner of usage of the coating without the additive.

It is recommended for wet rooms, swimming pools, streets, etc.