BR102018012021A2 - cement with antimicrobial properties - Google Patents

Abstract

compound from the following ingredients as a percentage by weight of the dry material to be ground: 0.1 to 0.3% of the phenoxyphenols and polychlorinated thiols bactericidal and fungicidal agent, 0.015 to 0.025% of the thioether family algicide, 0.015 to 0.025% benzimidazole fungicidal agent, 0.005 to 0.02% ion deaerating agent, 0.3 to 0.6% dosing filler limestone and 0.15 to 0.35% grinding aid commercial.

Description

“CEMENT WITH ANTIMICROBIAL PROPERTIES”

OBJECT OF THE INVENTION [001] The present invention relates to the formation of a cement by grinding aid in the grinding process that provides antimicrobial properties from the origin.

[002] Cement-based materials have a low susceptibility to be colonized by microorganisms due to their high alkalinity (pH 11 to 13). However, over time, the values are decreasing due to environmental conditions (washing by rainwater, carbonation, conditions of use). It is at this point that the compounds can be colonized by certain microorganisms. In most cases, this colonization of these materials by microorganisms has negative effects. These effects range from purely aesthetic and visual effects, to damage to human health, degradation of the structure by biological attack or loss of functionality.

[003] Despite the large number of disinfectants available on the market, it should be taken into account that many of the possible disinfectants must be disregarded due to their residual activity, so that the number of agents with the possibility of use is quite restricted.

[004] The development and use of antifouling products for concrete structures located in marine environments is a common technique in the world of civil engineering. Muraoka's work in 1972 (Antifouling Concrete, Muraoka, James S, NAVAL CIVIL ENGINEERING LAB PORT HUENEME CALIF, 1972) already pointed to the combination of several biocidal agents to achieve greater efficiency. There are several commercial products that work in this direction, such as the additive Zeomighty (Sinanen Zeomic Co. Ltd.), ConBlock MIC (Concrete Sealants Inc.) and ConMicShield (ConShield Technologies Inc.).

[005] All additives listed above are specifically designed for

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2/8 solve the problem of attack by Thiobacillus sp in waste transport tubes, without the activity against other types of microorganisms having been described. Likewise, these additives are designed to be added in bulk to the concrete. This assumes:

- High economic cost of the final solution, requiring large quantities of product.

- Little effectiveness of the product, due to the amount of additive used, since a large part of the additive is not effective to be inside the material that is not exposed.

[006] There are, therefore, several issues that need to be overcome, regarding the current state of the art:

- The biocidal agents to be used must be insoluble in water, so that the safety of the developed solution is guaranteed, both for human beings and for the environment in which the structure to be treated is located.

- The previous question implies the impossibility of applying water based biocidal agents, implying the need to develop new substrates and new ways of applying growth inhibitory agents.

- It is necessary to develop new ways of applying the biocidal additive, which allow to obtain an economically accessible solution, as well as efficient in terms of the amount of additive used by the exposed surface of the material.

- Finally, it is necessary to guarantee the durability of the biocide and the coating, which is abundant in the need to innovate in the biocidal agents to be used, in the formulation of the additive and in the form of its application in the construction material.

[007] Currently, there is no evidence that there is a cement that provides these antimicrobial properties to construction processes. It would be added in the clinker grinding process as a grinding aid, providing

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3/8 effects such as milling promoter and growth inhibiting characteristics of microorganisms (bacteria - yeasts - fungi and algae).

[008] The advantages of this invention are as follows:

- It solves the growth of microorganisms in different construction processes that until now were not treated at source or simply were not treated.

- The growth inhibitory properties of microorganisms are incorporated into concretes without changing their own characteristics.

[009] With the use of this cement, no additional or special treatment is necessary, providing the structural elements with cleanliness, disinfection and durability.

[010] The industrial application of this invention is within the following fields:

- Cements for work with risk of growth of microorganisms: marine works (algae); cooling towers of thermal and nuclear power plants (bacteria and algae); underground works with high water table (algae and fungi).

- Mortar cements: mortars common in sterile environments, hospitals (bacteria, yeasts, fungi and algae); mortar mortars, cover a reservoir of water, potable or not (bacteria, yeasts, fungi and algae); self-leveling mortars for floors, dairy plants, livestock farms, slaughterhouses, hospitals (bacteria, yeasts, fungi and algae); mono-layer mortars and facade plasters (fungi and algae).

- Concrete cements: prefabricated concrete, application of channels, ditches, pipes, tiles, paving stones, blocks, facade panels, prefabricated elements for marine and agricultural work (bacteria, yeasts, fungi and algae); prepared concrete, marine constructions (algae); agricultural buildings, grain silos (bacteria, yeasts, fungi and algae), industrial buildings with

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4/8 condensation (algae and bacteria); and construction of sewage treatment plants, pipes and dams (Thiobacillus thioxidans), (bacteria, yeasts, fungi and algae).

[011] Therefore, the industrial application of this invention is framed within the sector of the chemical industry, covering at the same time the construction field, being specifically focused on the manufacture of applicable antimicrobial products, such as cement grinding aid.

BACKGROUND OF THE INVENTION [012] Although no invention identical to that described has been found, we have set out below the documents found that reflect the state of the art related to it.

[013] Thus, document ES2496392R1 refers to antibacterial Portland cement that prevents the formation of fungi and mold. The cement essentially comprises clinker (A), plaster (B), mineral additive (C) and at least one antibacterial agent (D). The antibacterial agent applied to the cement according to the invention is triclosan. Unlike the main invention, with four antimicrobial active ingredients of various types, only one antibacterial agent is available.

[014] WO2005014256A1 describes a composite material that has an appearance similar to that of natural stone; comprising said material: a natural aggregate, a polymeric binder, a curing agent and an antimicrobial agent. As in the previous case, it is limited to an antimicrobial agent.

[015] ES2571995A1 refers to a composition for cement products and prefabricated concrete, prefabricated concrete containing the same and procedure for obtaining them. The composition of the invention has biocidal effects in both the presence and absence of light, as it includes organometallic components of a different nature that are active under normal atmospheric conditions. Per

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Therefore, the prefabricated products of the invention can be used both inside and outside buildings and public spaces and in both places they are able to reduce and / or eliminate bacteria, molds, allergens and other microorganisms. The invention does not detail or distinguish the different antimicrobial assets that are presented in the main invention, as well as the commercial vehicle and / or auxiliary grinding medium comprising the main invention.

[016] EP1685077B1 describes a process for preparing a cement product having antimicrobial properties, the process comprising: preparing a cement matrix comprising a water and cement suspension and a plasticizer additive; the mixture of a natural aggregate and the cement matrix; the addition of an antimicrobial agent to the aggregate and the cement matrix; the extension of the mixture of aggregate, cement matrix and antimicrobial agent in a modeling device; aerating the extended mixture of aggregate, cement matrix and antimicrobial agent by placing the mixture under vacuum; applying a vibratory motion to the deaerated mixture while the deaerated mixture is under vacuum; and curing the extended and de-aerated mixture to form a cement product, where the antimicrobial agent is tolyl diiodomethyl sulfone and is present in the aggregate and in the cement matrix in an amount between 100 ppm and 10,000 ppm. Again, there is a lack of addressing of all antimicrobial assets against which the cement of the main invention is defended.

Conclusions [017] As can be seen from the research carried out, none of the documents found solves the problems raised as the proposed invention does.

DESCRIPTION OF THE INVENTION [018] The cement with antimicrobial properties object of the present invention consists of a multicomponent solution, which allows to act on

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6/8 different microbial agents, composed of four antimicrobial active ingredients, a de-stemming agent, a vehicle medium and a commercial grinding aid.

[019] Below, we describe each of the components of the proposed solution and the projected formulation:

- The first component of the additive is a bactericidal and fungicidal agent that, without excluding other possible ones, belongs to the family of polychlorophenoxyphenols and thiols. These components act fundamentally in the lipid metabolism of microorganisms, although they may have other associated activities. The dosage of these components would be between 0.1% and 0.3% in dry weight of dry material to be ground.

- The second component is an algaecide agent that, without excluding possible ones, belongs to the family of Thioethers. This component acts fundamentally on the mechanism of photosynthesis and protein synthesis of microorganisms, although they may have other associated activities. The dosage of this second component would be between 0.015% and 0.025% in dry weight of dry material to be ground.

- The third component is a fungicidal agent that, without excluding other possible ones, belongs to the benzimidazois family. This component acts fundamentally in the photosynthesis mechanism and in the protein synthesis of microorganisms, without prejudice to other associated activities. The dosage of this third component would be between 0.015% and 0.025% in dry weight of dry material to be ground.

- The fourth component of the additive is a deaerating agent which, without excluding possible ones, is an ionic deaerating agent. This component has the fundamental function of minimizing the occlusion of air in the construction material, resulting from the addition of the above antimicrobial agents. The dosage of this third component would be between 0.005% and 0.02% in dry weight of dry material to be ground.

- The limestone filling. This component is used as a vehicle for

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7/8 the active ingredients. The dosage of this component would be between 0.3% and 0.6% in dry weight of dry material to be ground.

- The auxiliary component of commercial grinding is a biomolecule that has the function of improving grinding efficiency and improving the package set. The dosage of this component would be between 0.15% and 0.35% in dry weight of dry material to be ground.

[020] In a different embodiment, the additive of the invention can be applied, without prejudice to other possible ways, as a crushing aid. In all cases of application, the dose of the additive would be between 0.6% and 1.2% by weight of the dry material to be ground.

DESCRIPTION OF A PREFERRED EMBODIMENT [021] A preferred modality of cement with antimicrobial properties object of the present invention, with reference to numerical references, can be based on a solution of multiple components, which allows to act on the different microbial agents, composed of four ingredients antimicrobial assets, a disarming agent, a vehicle medium and a commercial grinding aid, in the following proportions:

- The first component of the additive is a bactericidal and fungicidal agent from the family of polychlorophenoxyphenols and thiols with a dosage between 0.1% and 0.3% in dry weight of the dry material to be ground.

- The second component is an algaecide agent from the family of uncle ethers with a dosage of between 0.015% and 0.025% in dry weight of dry material to be ground.

- The third component is a fungicidal agent from the benzimidazois family with a dosage between 0.015% and 0.025% in dry weight.

- The fourth component of the additive is an ionic de-aeration agent dosed between 0.005% and 0.02% by weight of the dry material to be ground.

- The limestone filling dosed between 0.3% and 0.6% by weight of the material

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8/8 dry to be ground.

- And the auxiliary component of commercial grinding, biomolecule that improves the grinding efficiency and improves the set of packages with dosage between 0.15% and 0.35% by weight of dry matter to grind.

Claims (2)

1. Cement with antimicrobial properties, CHARACTERIZED by the fact that it presents the following ingredients in percentage on the weight of dry material to be ground: a) 0.1 - 0.3% bactericidal and fungicidal agent of the family of polychlorinated phenoxyphenols and thiols b) 0.015 to 0.025% algaecide agent of the thioether family c) 0.015 to 0.025% fungicidal agent of the benzimidazole family d) 0.005 to 0.02% of ionic deaerator e) 0.3 to 0.6% of dosed limestone filling f) 0.15 to 0.35% of commercial grinding aid, biomolecule that improves grinding efficiency and improves the packaging set with a dosage between 0.15% and 0.35% by weight of the dry material to be ground 2. Composition, according to claim 1, CHARACTERIZED by the fact that the grinding aid is a biomolecule that improves the grinding efficiency and improves the packaging set.