JP2011116668A - Anti-bacterial sand, sandbox constructing method utilizing the same and sand recycling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a new sandbox anti-bacterial sand technique which surely avoids metal allergy and soil pollution, is friendly with human bodies and the environment, can improve the touch of sand and shaping properties, furthermore acquires a long-term sterilizing effect, and can be economically maintained. <P>SOLUTION: Anti-bacterial sand 1 is obtained by subjecting natural sand 10 or artificial sand 10 to heat sterilization treatment B at a temperature of 100 to 400°C which does not destroy the sand structure, subjecting the entire surface of each sand particle to coating treatment C with an anti-bacterial polymer obtained by diluting a water-soluble polymer containing at least one anti-bacterial component of an acidic group and a quaternary ammonium base, biguanide, pyridinium base, phosphonium salt or sulfonium salt which is ionically bonded to the acidic group with an appropriate amount of water, and forming and coating each dried water-insoluble anti-bacterial polymer layer 2 on the entire surface of each sand particle. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

    The present invention relates to antibacterial technologies such as outdoor resin molded products, textile products, film products, wood products, minerals, etc. Of course, the field of antibacterial sand used in sandboxes, horticulture and other applications is of course From the field of sand collection, sorting, cleaning, antibacterial treatment, transportation and use, equipment and tools necessary for such materials, machinery and parts, materials required for materials such as wood, Fields that provide stone materials, ceramics, various fibers, plastics, various metal materials, etc., electronic components incorporated in them, control-related equipment that integrates them, fields of various measuring instruments, power machines that move the equipment and instruments Fields that are generally referred to as industrial machinery, such as the electric power and energy sources that are used as energy, and the oil field. Fields related to testing, research, exhibition, sales, import / export of these, generals, and the results of their use, the equipment for making them, and the collection and transportation of garbage debris generated by the operation of equipment, etc. In addition to the related fields, the recycling field that efficiently recycles garbage waste, and the new fields that cannot be envisaged at the present time, there are no unrelated technical fields.

(Points of interest)
Playing in the sandbox gives various stimuli to the palms and fingers of children, such as the feel and weight of the sand grains, wetness and coldness, and the warmth of the solar heat, and is effective in the development of sensory nerves throughout the body. It is also effective for the development of communication skills and sociality between children, and is responsible for the next generation, by solidifying it into a shape, building a mountain and digging a tunnel, and using tools such as buckets and shovels. In recent years, especially with the hygienic development of the living environment, germs that inhabit and proliferate in sandboxes are becoming a social issue. There are concerns that children's feces, such as dogs and cats nearby, and their germs, roundworms and roundworm eggs may infect or infest children.

    The inventor of this application possesses heat treatment equipment for soil improvement from the experience of mainly developing mountain sand and various high-quality soil collection and sales business for many years. The sand in the sandbox is heated to kill bacteria. I thought that the problem of miscellaneous bacteria would be solved if I applied it, but when the sand that had been heat sterilized was returned to the sandbox as it was, germs would again grow over time, and the original unsanitary This sterilization by heat treatment cannot be a permanent countermeasure even though it is temporarily effective, leaving a fatal defect that it is not economical at all. It was.

(Conventional technology)
Concerned about this situation, for example, as typified by those proposed in the following Patent Documents 1 (1) to (10), it is possible to spontaneously evaporate directly into the sandbox or to sand collected from the sandbox. Disperse and mix disinfectant with hydrogen peroxide and chlorine dioxide dissolved in solvent, heat sterilization, UV sterilization, boiling sterilization, steam sterilization, other sterilization treatments, or boric acid, hypochlorous acid, silver Various antibacterials such as copper-coated ceramic, ferrous oxide, slaked lime and biodegradable resin and / or biodegradable wax, ceramic powder sintered and pulverized in silica sand, silver-containing soluble glass, other metals or metal ions A number of components, or spraying and mixing of antibacterial agents containing these antibacterial components, or artificial sand containing these antibacterial agents have already been developed, and further, Patent Document 1 (1 And antibacterial sand obtained by coating the sand surface with an antibacterial agent containing silver or copper with a binder, and, as in Patent Document 1 (12) and (13), an animal enters the sandbox. There are some cases where covers and protective nets can be installed.

However, the existing sterilization treatment technique such as the sandbox as shown in the former Patent Documents 1 (1) to (10), the heating of the sandbox sand, the ultraviolet ray treatment, etc. can obtain only a temporary effect. There are drawbacks, and metal and metal ions are at risk of developing metal allergies, are easily washed away by rainwater, have a short sterilization effective period, and may be contaminated with soil around sandboxes due to infiltration of metal components. The antibacterial sand coated with an antibacterial agent found in Patent Document 1 (11) with a binder has a fatal disadvantage that it is necessary to increase the frequency of maintenance and is uneconomical. Can remain on the sand surface over a long period of time, but it still has the disadvantage that the occurrence of metal allergy cannot be reliably prevented, and Patent Document 1 (12) And the sandbox cover and protection net shown in (13) can prevent the invasion of small animals such as dogs and cats, but the growth of germs and viruses that enter the sandbox as people enter and exit. There was a drawback that it did not prevent infection.
(1) JP 2008-237472 (2) JP 9-611 (3) JP 7-236682 (4) JP 2005-120040 (5) JP 2003-160419 (6) JP 2002-161010 (7) JP 2001-199804 (8) JP 9-322927 (9) JP 8-12512 (10) JP 2001-198196 (11) Japanese Patent Laid-Open No. 7-165521 (12) Japanese Patent Laid-Open No. 9-28926 (13) Japanese Utility Model Registration No. 3011575 (14) Japanese Patent No. 3174971

(Awareness of problems)
As mentioned above, the various sterilization treatments for sandboxes or sandbox sands that have been proposed in the past have to use antibacterial components consisting of metals and metal ions to achieve long-term effects. There is a risk of developing metal allergies, and there are concerns about the loss of antibacterial components caused by rainwater and soil contamination. As it is one of the outdoor facilities indispensable for early childhood education, families with children are more secure. For various children's facilities, parks, elementary schools, etc., where children are kept, it is of course possible to ensure the safety and safety of the sandbox. In addition, it can be said that there is a need for further improvement in the improvement of the feel and formability of sand and the securing of economical maintainability.

(Object of invention)
Therefore, the present invention reliably avoids metal allergies and soil contamination, improves the feel and formability of sand that is kind to the human body and the environment, and provides a long-term sterilization effect that can be economically maintained. Judging whether it is possible to develop antibacterial sand technology, we immediately started its development and research. With the cooperation of Yamagata University Graduate School of Science and Engineering, Professor Akihiko Kanazawa, antibacterial technology related to Patent Document 1 (14) As a result of repeating trial and error over many years and many trial productions and experiments, we finally realized antibacterial sand with a new structure, a new sandbox construction method using it, and a new sand recycling method. In the following, the configuration will be described in detail together with an embodiment representative of the present invention shown in the drawings.

(Structure of the invention)
As will be clearly understood from the embodiments representing the present invention shown in the drawings, the antibacterial sand of the present invention basically comprises the following constitution.
That is, an insoluble antibacterial polymer layer in which either a metal, a metal ion, or a high-molecular substance containing an antibacterial component other than an inorganic antibacterial agent is a main component is formed on the entire surface of each sterilized natural sand or artificial sand. This is antibacterial sand having a gist configuration.

    More specifically, natural sand or artificial sand is heat sterilized at 100 to 400 ° C. at which the sand structure is not destroyed, and an acidic group, a quaternary ammonium base ionically bonded to the acidic group, a biguanide, Each insoluble antibacterial polymer layer obtained by coating the entire surface of each sand grain with an antibacterial polymer obtained by diluting an appropriate amount of water with a water-soluble polymer containing at least one antibacterial component of pyridinium base, phosphonium salt and sulfonium salt, and drying Is formed on the entire surface of the sand grains and becomes antibacterial sand having a structure formed by coating.

(Related invention 1)
In relation to the antibacterial sand described above, the present invention also includes a sandbox construction method using the same.
In other words, a drainage facility such as a drainage net or a permeation pipe is placed at the bottom that is dug down to a depth of 35 to 45 cm and several children can play at the same time. At least height of spraying of antibacterial components other than metal, metal ions, or inorganic antibacterial agents, or heat treatment in a sandbox space where fences with doorways for entrances and exits are placed at appropriate heights that can prevent entry It is a sandbox construction method using the antibacterial sand which forms the basis of the present invention, which is sterilized on either side and is laid down at an appropriate depth with the antibacterial sand which forms the basis of the present invention.

(Related invention 2)
In relation to the antibacterial sand described above, the present invention also includes a sand recycling method using the sand.
That is, the sandbox space where used sand is collected and emptied is sterilized by spraying antibacterial components other than metal, metal ions, or inorganic antibacterial agents, and / or heat treated, and then the collected sand The sand is sterilized after removing foreign substances, washed, and then coated with an insoluble antibacterial polymer layer. The antibacterial sand, which forms the basis of the present invention, is returned to the sandbox space and spread to an appropriate depth. This is a sand recycling method using the antibacterial sand that forms the basis of the present invention.

    As described above, according to the antibacterial sand of the present invention, unlike the conventional ones, the main component of the insoluble antibacterial polymer layer formed and coated on the entire surface of each sand grain has a high characteristic as described above. Any of the molecular substances that contain antibacterial components other than metals, metal ions, or inorganic antibacterial agents, and development of metal allergies such as those using conventional metals or metal ions as antibacterial components In addition, since the antibacterial component is contained in the insoluble antibacterial polymer layer, the antibacterial component is not easily washed away by rainwater, or soil contamination is not caused. In addition, the insoluble antibacterial polymer layer continuously maintains the bactericidal power and sufficiently generates a certain amount of sterilizing power even in the process where the surface layer gradually deteriorates over time. It is possible to achieve a high antibacterial effect over a long period of time, and it is excellent in maintainability, so that high economic efficiency can be achieved, and the high-molecular substance of the insoluble antibacterial polymer layer is colorless and odorless for the human body and the environment. It is gentle and has a sanitary and smooth feel that keeps water retention. Furthermore, it is possible to clean the mold well, and if you select only fine sand with a sieve, you can make even more delicate modeling. The excellent effect of becoming will be demonstrated.

    In addition, natural sand or artificial sand previously heat-sterilized at 100 to 400 ° C. is mixed with an acidic group and at least quaternary ammonium base, biguanide, pyridinium base, phosphonium salt, and sulfonium salt that are ionically bonded to the acidic group. A water-soluble polymer containing one antibacterial component is an antibacterial polymer diluted with an appropriate amount of water, and the entire surface of each sand grain is coated and then dried to form and coat each insoluble antibacterial polymer layer on the entire surface of the sand grain. As a result, it is possible to maintain the appearance of the natural color or shape without destroying the sand structure of natural sand or artificial sand by heat sterilization treatment, and the water-soluble polymer is complicated without the need for organic solvents. It adheres well and adheres firmly to the uneven sand surface, and ensures that the insoluble antibacterial polymer layer after drying is washed away by rainwater or water spray. It shall be prevented, but exert a significant effect that the insoluble antimicrobial polymer layer can be sustained antimicrobial over time until it is completely peeled fall.

    If the water-soluble polymer base material is made of at least one of polystyrene, polyolefin, polyacrylate, and polyester, it becomes insoluble in water after drying, is non-toxic, odorless, colorless, and has irregularities and roughness on the surface of sand particles. Smooth, protects the skin of children's limbs, etc., has superior water retention compared to the existing natural sand, and can achieve the effect of enabling more detailed modeling and molding.

    Those in which the acidic group is a monomer containing at least one of a carboxyl group, a sulfone group, a phosphone group, a phosphine group or a phenolic hydroxyl group is safe to the human body, friendly to the natural environment, and exhibits a high sterilization effect. .

    If the weight content of the insoluble antibacterial polymer layer to sterilized natural sand or artificial sand is set to 0.05% to 0.15%, the weight content is within 24 hours from the start of use after laying in the sandbox space. Depending on the rate, it is possible to achieve a sterilization rate of 98% to 100%, and the amount of antibacterial polymer used can be kept to a minimum. In addition, the sterilizing effect is excellent in that it can be sustained for a long time until the insoluble antibacterial polymer layer is peeled off and washed away.

    According to the sandbox construction method using the antibacterial sand of the present invention, the antibacterial sand is spread in a sandbox space that has been subjected to appropriate sterilization treatment to reliably prevent the entry of bacteria and viruses from the outside. Since a fence that can prevent the entry of small animals is stretched around the curb of the sandbox opening, it prevents the small animals from entering and contaminates the antibacterial sand after construction. The antibacterial performance is more reliably demonstrated, and hygienic use over a long period of time can be realized.

    According to the sand recycling method using antibacterial sand of the present invention, when the sandbox using the antibacterial sand is used over a long period of time, when the antibacterial activity has declined, the used antibacterial sand is recovered, Since it is sterilized after removing foreign substances and washed, an insoluble antibacterial polymer layer is formed on the entire surface of the sand grain, coated and regenerated, so that it can be returned to the sterilized sandbox space again. It has the great effect that it can be economically maintained without the disposal of used antibacterial sand and the purchase of new natural or artificial sand.

In implementing the present invention having the above-described configuration, the best or desirable mode will be described.
Natural sand is about 2mm in diameter, such as river sand, sea sand, mountain sand, and more specifically, quartz, plagioclase, potash feldspar, orthopyroxene, clinopyroxene, each feldspar, garnet, muscovite , Biotite, olivine, olivine, magnetite, pyrite, volcanic glass, rock fragments, natural gold, and other artificial artifacts such as glass grains and ceramic grains. Artificial sand is not natural sand. Sand, non-metal stone powder, earth powder, ceramic powder, resin, etc., and then sintered, glass grains, earthenware grains, and the like.

    The antibacterial component is contained in the coated insoluble antibacterial polymer layer formed on the entire surface of each sand particle of natural sand or artificial sand, and for a long time, various bacteria such as Salmonella, Escherichia coli, Staphylococcus aureus and viruses, roundworms, roundworm eggs Such as those that are harmless to the human body, colorless and odorless, and other than metals, metal ions, or inorganic antibacterial agents, as shown in the examples described later. An acidic group and at least one of a quaternary ammonium base, a biguanide, a pyridinium base, a phosphonium salt, and a sulfonium salt that are ionically bonded to the acidic group, wherein the acidic group is a carboxyl group, a sulfone group, or a phosphonic group At least one of a phosphine group or a phenolic hydroxyl group, or a sodium salt, potassium salt or ammonium salt thereof. The assumed to be free monomer is preferable.

    Examples of the monomer having a carboxyl group include acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, maleic anhydride, 3-butene-1,2,3-tricarboxylic acid, 1,2,3,4-butanetetra. Examples of the monomer having a sulfone group such as carboxylic acid and 4-pentenoic acid include styrene sulfonic acid, vinyl sulfonic acid, allyl sulfonic acid, sulfopropyl acrylate, sulfopropyl methacrylate, 3-chloro-4-vinylbenzine sulfonic acid. 2-acrylamido-2-methylpropanesulfonic acid, 2-acryloyloxybenzenesulfonic acid, 2-acryloyloxynaphthalene-2-sulfonic acid, 2-methacryloyloxynaphthalene-2-sulfonic acid, sulfoisophthalic acid, sulfoterephthalic acid , Sulfo There are Lumpur acid or 4-sulfo-2,7-dicarboxylic acid salt.

    Monomers having a phosphone group include, for example, allyl phosphonic acid, acid phosphooxyethyl ethyl methacrylate, 3-chloro-2-acid phosphoxypropyl methacrylate, 1-methylvinylphosphonic acid, 1-phenylvinylphosphonic acid, 2-phenyl There are vinylphosphonic acid, 2-methyl-2-phenylvinylphosphonic acid, 2- (3-chlorophenyl) vinylphosphonic acid, 2-diphenylvinylphosphonic acid and the like, and examples of the monomer having a phosphine group include allylphosphinic acid. Examples of the monomer having a phenolic hydroxyl group include ortho-oxystyrene and ortho-vinylanisole.

    The high-molecular substance is the main component of the insoluble antibacterial polymer layer, is harmless to the human body, can be mixed homogeneously without separating the antibacterial component, and the antibacterial component has a sustainable antimicrobial effect over a long period of time As shown in the examples to be described later, it is made of a water-soluble polymer so that it can evenly spread and adhere to the entire surface of each sand particle of natural sand or artificial sand, and is cured after drying. It is desirable to be able to form an insoluble antibacterial polymer layer, and the water-soluble polymer base material can be made of at least one of polystyrene, polyolefin, polyacrylate, and polyester.

    In other words, the other monomer copolymerizable with the acidic group-containing monomer can be selected from a wide range according to the use of the antibacterial material that is the final product. Specific examples thereof include ethylene, Propylene, vinyl chloride, vinylidene chloride, vinyl acetate, vinyl propionate, vinyl crotonic acid, acrylic ester, methacrylic ester, acrylonitrile, hydroxyethyl acrylate, hydroxy methacrylate, styrene and its derivatives, butadiene, acrylamide and its derivatives, acrylic There are allylic compounds such as propyl ester, vinyl ether, terephthalic acid, isophthalic acid, maleic acid, vinyl pyridine, N-vinyl-2-pyrrolidone, isobutylene, diisobutylene, etc., which may be one or more There.

    As the polymerization method, any of ordinary polymerization methods such as an emulsion polymerization method, a solution polymerization method, a bulk polymerization method and the like can be adopted. In particular, the emulsion polymerization method tends to have many acidic groups distributed on the surface of the obtained polymer particles. This is particularly desirable because

    Antibacterial agents having a phosphonium base include, for example, tetraethylphosphonium bromide, triethylbenzylphosphonium chloride, tetra-n-butylphosphonium bromide, tetra-n-butylphosphonium chloride, tri-n-butylmethylphosphonium iodide, tri-n-butyloctyl. Phosphonium bromide, tri-n-butyloctylphosphonium bromide, tri-n-butylhexadecylphosphonium bromide, tri-n-butyloctadecylphosphonium bromide, tri-n-butylallylphosphonium bromide, tri-n-butylbenzylphosphonium bromide, tri -N-octylethylphosphonium bromide, tris (3-hydroxypropyl) octylphosphonium bromide, tris (3- Droxypropyl) octadecylphosphonium bromide, tris (3-hydroxypropyl) hexadecylphosphonium bromide, and the like. In the phosphonium salt, the antibacterial activity is affected by the length of the alkyl group bonded to phosphorus, for example, ethyl, Butyl and octyl have high antibacterial activity, and one of their alkyl groups is long, for example, tri-n-ethyloctadecylphosphonium bromide and tri-n-butyloctadecylphosphonium bromide exhibit very high antibacterial activity. When a salt is used as an antibacterial component in an antibacterial material, it exhibits an excellent antibacterial effect as compared with a conventionally used quaternary ammonium salt or the like.

    The sandbox space can be secured to allow more than a few children to play at the same time, and the drainage facility such as a drainage net or a permeation pipe is dug down to a predetermined depth, or an equivalent drainage function. In addition to laying a curb around the opening of the sandbox hole dug down to a depth of 35 to 45 cm, and a fence that is high enough to prevent the entry of small animals around it, It must be sterilized by spraying antibacterial components other than metals, metal ions, or inorganic antibacterial agents, and / or heat treatment. If the sandbox hole is too deep, the children and adults When stepped on, there is a possibility that the sinking will be too large, and if it is too shallow, the fingers that are dug down may be damaged.

    The sandbox construction method using antibacterial sand must be heated to 100 to 400 ° C when subjecting the target sandbox and sand to heat sterilization treatment, and below 100 ° C, germs, viruses, roundworms, roundworm eggs In addition, there is a possibility that it cannot be sufficiently killed, and heating over 400 ° C. requires a large amount of heat energy, increasing the economic burden and possibly causing the sand grains to collapse. It is appropriate to heat in the range of about 100 ° C.

The sand recycling method using antibacterial sand is used to transport used sand collected from the target sandbox to a recycling factory, and the antibacterial sand that has been recycled is the same target sandbox that has been sterilized. In addition to being able to carry in, it is possible to manage the sand collected from multiple sandboxes in a batch so that the required amount of antibacterial sand that has been recycled can be carried into the target sandbox. Furthermore, the vehicle-mounted recycling device can be moved to the target sandbox, and the sand collected from the sandbox can be recycled on the spot and laid in the sterilized sandbox. .
In the following, the structure of the present invention will be described in detail together with an embodiment representative of the present invention shown in the drawings.

    The example shown in the cross-sectional view of the antibacterial sand in FIG. 1 and the flow chart of the antibacterial treatment process for sand in FIG. 2 is performed on the entire surface of each sand particle 10 of sterilized natural sand or artificial sand other than metal, metal ions, or inorganic antibacterial agents. A representative example of the antibacterial sand of the present invention, in which any of the high-molecular substances containing the antibacterial component is formed by forming and coating the insoluble antibacterial polymer layer 2 as the main component, is shown.

    As can be clearly seen from these figures, the antibacterial sand 1 of the present invention is natural sand such as river sand, sea sand, mountain sand, or artificial sand produced by granulating and firing ceramic powder. Or any of those mixed sand or sand collected from the sandbox, and the diameter of the sand 10 is about 2 mm, and the safety confirmed sand 10 is any of sieve, filter, centrifuge, etc. At 200 ° C, the foreign matter is selected and removed by craving, and after supplying and stirring water and thoroughly washing A, the sand 10 tissue is not destroyed and germs, roundworms and roundworm eggs can be killed. After heat sterilization treatment B, either natural cooling or forced cooling by air blowing / stirring or the like, or after cooling to an appropriate temperature of 100 ° C. or lower during the cooling process A polymer containing an antibacterial component at any stage Each of these is either a kneaded stirring operation while spraying an antibacterial polymer in which the water-soluble polymer of the main component is diluted with an appropriate amount of water, or it is put into the antibacterial polymer tank, immersed in and recovered, etc. After the coating process C so as to form a layer on the entire surface of the sand grains 10, the sand 10 is agitated and fluidized in the drying / coating process D so that they do not adhere to each other and are naturally dried individually. Alternatively, the insoluble antibacterial polymer layer 2 is formed and coated on the entire surface of the sand grains 10 by forced drying.

The antibacterial component is at least one of the following (Chemical Formula 1 and Chemical Formula 2), quaternary ammonium salt, phosphonium salt, sulfonium salt, biguanide, pyridinium salt, such as cetylpyridinium chloride, benzalkonium chloride, Any one of cetrimide, chlorhexidine, cetylpyridinium chloride, triphenyldodecylphosphonium, or a mixture thereof can be used.

The water-soluble polymer base material can be any one of the following (Chemical Formula 3) polystyrene-based, polyolefin-based, polyacrylate-based, and polyester-based materials, or a mixture thereof.

当該砂１０に対する不溶性抗菌ポリマー層２の重量含有率は、例えば０．０１％、０．０５％または０．１％の何れか１つの条件に設定したものとする。 The antibacterial polymer treatment by the coating treatment C and the drying / coating treatment D is to form and coat the insoluble antibacterial polymer layer 2 on the entire surface of the sand grain 10 with only water without using an organic solvent. Shows an example in which a polystyrene-based water-soluble polymer substrate is reacted with cetylpyridinium chloride in two steps to change from a water-soluble polymer to an insoluble polymer.

The weight content of the insoluble antibacterial polymer layer 2 with respect to the sand 10 is set to any one of 0.01%, 0.05%, or 0.1%, for example.

    The cross-sectional view of the sandbox space in FIG. 3, the plan view of the sandbox space in FIG. 4, the cross-sectional view of the sandbox space in which the sand is collected in FIG. 5, and the cross-sectional view of the sandbox space in which antibacterial sand is spread in FIG. The sand recycling method using the antibacterial sand 1 of the present invention is shown. The sandbox space 3 is formed in the bottom 31 of the sandbox hole 30 dug down to a depth of 35 to 45 cm with a plane area that allows several children to play simultaneously. A drainage facility consisting of permeable pipes 32, 32, ... is buried, and curbs 34, 34, ... are laid around the opening 33 of the sandbox hole 30, and at a height that can prevent the entry of small animals around it. As shown in FIGS. 3 to 6, after the existing sand 10 is collected and emptied from the sandbox space 3 in which the fence 35 having the door opening / closing door 36 is stretched, the sandbox hole 30 is opened. Including the entire sandbox space 3 The acidic group which is the same as that used for antimicrobial polymer coating of the antimicrobial sand 1 of Example 1 and is an antimicrobial component other than a metal, metal ion, or inorganic antimicrobial agent, and the acidic group While sterilizing by applying an appropriate amount of at least one of quaternary ammonium base, biguanide, pyridinium base, phosphonium salt, and sulfonium salt that are ionically bound to each other, is the recovered sand 10 transported to a processing plant? As shown in FIG. 1 and FIG. 2, the insoluble antibacterial polymer layer 2 is formed on the entire surface of each sand particle 10 in accordance with the antibacterial treatment process of Example 1 as shown in FIGS. After the coating, as shown in FIG. 6, it is assumed that the sandbox hole 30 in the sandbox space 3 is spread to an appropriate depth.

    The sandbox construction method using the antibacterial sand 1 according to the present invention is that the sandbox space 3 is newly constructed, sterilized, and then the natural sand 10 or the artificial sand 10 in the sandbox hole 30. A new sandbox space 3 is installed by spreading the antibacterial sand 1 that has been subjected to the antibacterial polymer coating treatment shown in FIG.

(Operation of Example 1)
As shown in FIGS. 1 to 6, the antibacterial sand 1 of the present invention having the above-described configuration includes metals and metal ions that can cause metal allergy, organic solvents that can cause various physical disorders, and the like. The insoluble antibacterial polymer layer 2 formed and coated on the entire surface of each sand grain 10 exhibits a high sterilization action over a long period of time, so that the entire sandbox space 3 is maintained in a safe and excellent hygienic state. Moreover, as shown in Table 1 below, when the antibacterial sand 1 having a weight content of the insoluble antibacterial polymer layer 2 with respect to the sterilized sand 10 is 0.01% spread in the sandbox space 3 of the nursery school, it is first used. The sterilization rate (after 24 hours) is 96%, the antimicrobial sand 1 having the same weight content of 0.05% is 98%, and the sterilization rate is 100% when the same weight content is 0.1%. To get Has become apparent by practice of the antibacterial testing, its initial antibacterial activity, any insoluble antimicrobial polymer layer 2 which covers the respective sand 10 surface completely peeled off, it is to persist until it has washed away.

    The insoluble antibacterial polymer layer 2 formed and coated on the entire surface of each sand grain 10 does not elute into rainwater or water spray, and continues to adhere firmly to the surface of each sand grain 10 over a long period of time, thereby exhibiting a durable antibacterial action. At the same time, the water-retaining property can be maintained and the sand molding property can be improved. Moreover, the growth of germs due to the water retention can be prevented, and the generation of the odor of germs can be reliably prevented to keep the sand 10 in an odorless state. Protects the skin by providing a smooth touch to the children's fingers to prevent rough skin, and the sandbox for about 2 to 5 years until the insoluble antibacterial polymer layer 2 is completely removed and washed away. It is possible to maintain the entire space 3 in a hygienic environment.

(Operation of Example 2)
As shown in FIGS. 1 to 6, the sand recycling method using the antibacterial sand 1 of the present invention eliminates the need to dispose of used sand or purchase new sand. Dangerous glass pieces, metal pieces, plastic pieces, stones, wood pieces, etc. can be separated and removed in the process of separating and removing foreign materials and playground equipment that have been collected and buried. It is possible to clean the feces and urine of small animals that are mixed in the sand and cause germs and roundworms, etc., and the germs and viruses, roundworms, roundworm eggs, etc. attached to the sand by heat sterilization B Since it is reliably sterilized and removed, and the coating process C is performed, it is possible to produce an extremely hygienic antibacterial sand 1 that is free from contamination by germs, viruses, roundworms, etc., and can be surrounded by a fence 35 to prevent entry of small animals Sterilized The antibacterial sand 1 is laid in the sandbox space 3 of the house, so that small animals can be prevented from entering the sandbox space 3 after the recycling process is completed, and urination and defecation can be reliably prevented for hygienic management over a long period of time. It becomes possible.

    The sandbox construction method using the antibacterial sand 1 according to the present invention requires an initial cost for the production of the antibacterial sand 1 and the installation of the sandbox space 3, but after construction, it is hygienically maintained by preventing entry of small animals. It is possible to use the antibacterial sand 1 using the antibacterial sand 1 according to the present invention for the first time when the insoluble antibacterial polymer layer 2 of the antibacterial sand 1 has been peeled off. Hygiene management can be carried out efficiently and economically.

(Effect of Example 1)
The antibacterial sand 1 of Example 1 having the above-described configuration is sterilized sand as a result of an antibacterial test as shown in Table 1 in addition to the characteristics described in the section of the effect of the present invention. When the weight content of the insoluble antibacterial polymer layer 2 with respect to 10 is 0.01%, the initial sterilization rate is 96%, when 0.05%, the initial sterilization rate is 98%, and when 0.1%, the initial sterilization rate is 100%. % Can be achieved, and if the weight content of the insoluble antibacterial polymer layer 2 is set to 0.05 to 0.15%, a sterilization rate of 98% or more can always be achieved, and an excess of antibacterial polymer can be achieved. It is gentle to the natural environment by preventing its use, can be economical in each stage, and has a much more economical and long-term antibacterial effect compared to the sandbox space 3 that has only been subjected to conventional sterilization treatment. The excellence of being something you can get Effect can be exhibited.

(Effect of Example 2)
The sand recycling method using the antibacterial sand 1 according to the second embodiment, in addition to the features described in the section of the effect of the present invention, as shown in FIGS. 3 to 6, is applied to the entire sandbox space 3 including the sandbox holes 30. The same acidic group used to coat the antibacterial sand 1 of Example 1 with the antibacterial polymer, and a quaternary ammonium base, biguanide, pyridinium base, phosphonium salt and sulfonium salt ionically bonded to the acidic group Since the antibacterial sand 1 that has been recycled is spread in the sandbox hole 30 after the appropriate amount of at least one of the above is spread and sterilized, the entire sandbox space 3 including the sandbox hole 30 is It is coated with the insoluble antibacterial polymer layer 2 and has an excellent effect that it can obtain a long-term sterilization effect equivalent to the antibacterial sand 1 rather than a temporary antibacterial action. Becomes shall, therefore by performing the same operations in a sandbox construction method of the antimicrobial sand first usage, and that the whole Sand space 3 is long term sterilization.

(Conclusion)
As described above, the antibacterial sand of the present invention, the sandbox construction method using the sand, and the sand recycling method can achieve the intended purpose evenly by the novel configuration, and further, sterilization treatment and recycling treatment are achieved. Compared with conventional sandbox cleaning technology, it is possible to sterilize effectively over a long period of time, greatly contributing to children's healthy and sanitary sandbox play, and maintenance efficiency. The parents who have been worried about the health of children playing in unsanitary sandboxes can now achieve the rational improvement of hygiene management and the reduction of economic burden. It is a good news for children, various groups, various child facilities that take care of children, elementary schools, etc., and it will be highly evaluated in the construction and maintenance of the sandbox and in the civil engineering industry.及 is expected to be that we been achieved.

The drawings show some typical embodiments embodying the technical idea of the antibacterial sand of the present invention, a sandbox construction method using the same, and a sand recycling method.
It is sectional drawing which shows antibacterial sand. It is a flowchart which shows an antibacterial sand manufacturing process process. It is sectional drawing which shows the existing sandbox space. It is a top view which shows the existing sandbox space. It is sectional drawing which shows the sandbox space which collect | recovered used sand. It is sectional drawing which shows the sandbox space which spread antibacterial sand.

1 Antibacterial sand
10 Same natural sand (or artificial sand)
2 Insoluble antibacterial polymer layer 3 Sandbox space
30 Same sandbox hole
31 Same bottom
32 Same permeable pipe (drainage facility)
33 Same opening
34 The curb
35 Fence
36 Open / close door A Foreign matter removal, cleaning B Heat sterilization (sterilization)
C Coating treatment D Drying / film treatment

Claims (7)

    An insoluble antibacterial polymer layer of the main component is formed and coated on the entire surface of each sand particle of sterilized natural sand or artificial sand with either a metal, metal ion, or a polymer substance containing an antibacterial component other than an inorganic antibacterial agent. Antibacterial sand characterized by     Natural sand or artificial sand is heat sterilized at 100 to 400 ° C. so that the sand structure is not destroyed, and an acidic group and a quaternary ammonium base, a biguanide, a pyridinium base, a phosphonium salt, and a sulfonium salt ion-bonded to the acidic group A water-soluble polymer containing at least one antibacterial component is diluted with an appropriate amount of water, and the entire surface of each sand grain is coated and then dried to form each insoluble antibacterial polymer layer on the entire surface of the sand grain. Antibacterial sand, characterized by     The antibacterial sand according to any one of claims 1 and 2, wherein the water-soluble polymer substrate is made of at least one of polystyrene, polyolefin, polyacrylate, and polyester.     The antibacterial sand according to any one of claims 1 to 3, wherein the acidic group is a monomer containing at least one of a carboxyl group, a sulfone group, a phosphone group, a phosphine group, or a phenolic hydroxyl group.     The antibacterial sand according to any one of claims 1 to 4, wherein the weight content of the insoluble antibacterial polymer layer with respect to sterilized natural sand or artificial sand is set to 0.05% to 0.15%.     Drainage facilities such as drainage nets or permeation pipes are placed at the bottom of a flat area that can be played by several children at the same time, with a depth of 35 to 45 cm. A curbstone is laid around the opening, and small animals enter the area. At least one of spraying antibacterial components other than metals, metal ions, or inorganic antibacterial agents, or heat treatment in a sandbox space with fences that are placed at appropriate positions and have fences with doorways for entrances and exits. On the other hand, after sterilizing, the antibacterial sand-use sandbox construction method according to any one of claims 1 to 5, wherein the antibacterial sand according to any one of claims 1 to 5 is spread to an appropriate depth. .     The sandbox space where used sand is collected and emptied is sterilized by spraying antibacterial components other than metals, metal ions, or inorganic antibacterial agents, and / or heat treated, and then the collected sand is The antibacterial sand according to any one of claims 1 to 5, which is sterilized after removing foreign substances and washed and then coated with an insoluble antibacterial polymer layer, is returned to the sandbox space and spread to an appropriate depth. The method for recycling sand using antibacterial sand according to any one of claims 1 to 5.

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