JPS6238299A - Scale inhibitor for toilet drain pipe - Google Patents

Abstract

PURPOSE:To prevent the cohesion of scale to a toilet drain pipe, by using a molded body prepared by using a solid acid as an effective component and containing a base material and other additives. CONSTITUTION:If necessary, a water soluble base material (e.g., polyethylene glycol or polypropylene glycol) and a base material having sublimability (e.g., p-dichlorobenzene or naphthalene) are mixed with a solid acid solid at ambient temp. such as sodium bisulfate, potassium bisulfate, ammonium bisulfate, boric acid or sulfamic acid and the mixture of the components is melted under heating to form a molten substance which is, in turn, injected in a mold to be cooled and solidified. The content of additives is set to 20-80wt% and the ratio of the water soluble base material is set to 10-60pts.wt. of 40-90pts. of the sublimable base material. The obtained molded body is provided in a purified water storage tank. By this method, scale is efficiently prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a scale preventive agent for toilet drain pipes, and more specifically, to an agent for preventing scale mainly composed of calcium from adhering to toilet drain pipes. Concerning suitable drugs.

The scale inhibitor of the present invention can be applied to various types of flush toilets or men's toilets without flush facilities.

[Conventional technology]

In toilet drain pipes, especially those in men's restrooms, scale called urinary stone, which is a mixture of calcium-based compounds and organic substances produced by the decomposition of urine, forms, and this blocks the flow of urine and washing water. This worsens the situation and, in severe cases, can block the drain pipes, rendering the toilet unusable.

Furthermore, organic matter in urinary stones is decomposed by bacteria and produces a foul odor. The foul odor in the men's restroom is a mixture of foul odor caused by decaying organic matter and ammonia produced by the decomposition of urine.

BACKGROUND ART Conventionally, methods for preventing scale in toilet drain pipes have been put into practical use, such as a method in which a chemical is injected into the middle of a flush water pipe, and a method in which a chemical formed into a spherical shape is poured into a toilet bowl in a men's restroom.

Various drugs containing surfactants, bactericidal agents, and fragrances have been proposed and proposed for use in these methods.

For example, Japanese Patent Publication No. 45-30706 describes a deodorizing cleaning agent for flush toilets made by melt-mixing a surfactant, an ion sequestrant, a fragrance, etc. with polyethylene glycol or polypropylene glycol and an aromatic substance, and then injection molding the mixture.
A cleaning and antifouling fragrance made by cooling and solidifying a melted mixture consisting of polyethylene glycol, which is solid at room temperature, a poorly water-soluble aromatic substance, a nonionic surfactant, and additives such as fragrances, has been disclosed in JP-A-57- It is described in No. 168668.

Furthermore, as methods for controlling scale that has once stuck to toilet drain pipes, methods have been adopted, such as using a strong inorganic acid such as hydrochloric acid to dissolve the scale, and removing the toilet bowl and mechanically removing the scale.

[Problem that the invention seeks to solve]

The use of conventional agents consisting of surfactants, disinfectants, and fragrances is effective in preventing soiling of toilet bowl walls and preventing the generation of bad odors. However, the effect of preventing scale from adhering to the toilet drain pipe is not sufficient, and the flow of the disinfectant into the septic tank interferes with the action of the septic seed bacteria, reducing the purification ability of the septic tank.

The use of cleaning and deodorizing agents consisting of surfactants and fragrances is also effective in preventing stains on the toilet bowl wall and in preventing the generation of bad odors.

However, the effect of preventing scale from sticking to toilet drain pipes is even smaller.

Adding an ion sequestering agent to urine or wash water is quite effective in preventing scale build-up.

However, to completely prevent scale from sticking,
It is necessary to add 0.3 to 1% by weight of ion sequestrant to urine. Generally, ion sequestering agents are expensive and this method is difficult to widely popularize.

Furthermore, dissolving and removing fixed scale using strong acids and mechanically removing fixed scale by removing the toilet bowl are unpleasant and difficult tasks. In addition, when removing scale using strong acids, corrosion of the drain pipes due to the acid and a decrease in purification ability due to the acid flowing into the septic tank become a problem, while when removing scale mechanically, damage to toilet bowls and drain pipes becomes a problem.

An object of the present invention is to provide a drug suitable for preventing scale from sticking to toilet drain pipes.

[Means for solving problems]

That is, the present invention is a scale preventive agent for toilet drain pipes, which is made of a molded article that mainly contains a solid acid as an active ingredient and optionally contains a base material and/or other additives.

In the present invention, a solid acid is an acidic substance that is solid at room temperature, reacts with calcium ions, and has a solubility in water of pH 5 to 8.5 of 0.001 g/100 g (water).
There is no particular restriction as long as it does not produce the following salts. For example, sodium hydrogen sulfate, potassium hydrogen sulfate,
Examples include water-soluble acid salts such as ammonium hydrogen sulfate, water-soluble salts of strong acids and weak bases such as ammonium chloride and ammonium sulfate, and boric acid and sulfamic acid. Also, room temperature solids such as succinic acid, citric acid, maleic acid, isophthalic acid, tartaric acid, hydroxyacetic acid, P-toluenesulfonic acid, fumaric acid, adipic acid, salicylic acid, brassicylic acid, hydrocinnamic acid, maleic anhydride, benzoic acid, etc. Organic salts of can also be used.

These acidic substances can be used singly or as a mixture of two or more.

The scale inhibitor for toilet drain pipes of the present invention can have any shape containing the solid acid as an active ingredient, such as spherical, cylindrical, perforated cylindrical, disc-shaped, cubic, conical, pyramid-shaped,
A molded body having the shape of an animal or plant, etc., which is a molded body consisting only of a solid acid or a molded body of a mixture consisting of a solid acid, a base material added as desired, and other additives,
As additives added as desired, a dissolution rate regulator,
Examples include surfactants, fragrances, colorants, corrosion inhibitors, bactericides, ion sequestrants, and the like.

The scale inhibitor of the present invention can be produced by known molding methods, such as mixing and tableting each component, heating a mixture of each component, and pouring the dissolved molten slurry into a mold, cooling, and solidifying. be able to.

The base material is used for the purpose of giving the solid acid good moldability and dissolving the molded product in urine and/or washing water at an appropriate rate and without losing its shape. . As the base material, a water-soluble base material and/or a sublimable base material that can be melt-molded or pressure-molded and that dissolves without disintegrating when the molded product is brought into contact with water is used. Examples of the water-soluble base material include water-soluble polymers that are solid at room temperature, such as polyethylene glycol, polypropylene glycol, etc., and/or various surfactants. As a sublimable base material, it is poorly soluble in water and
Sublimating substances having a vapor pressure of about 0.05 to 5 ttuaHg at room temperature, such as baladichlorobenzene and naphthalene, can be used. Further, these water-soluble base materials and/or sublimable base materials can be used alone or as a mixture of two or more.

In the molded article, when a sublimable base material and/or a water-soluble base material is used as a base material, the content of the sublimable base material and/or water-soluble base material is 20 to 80% by weight, When both a sublimable base material and a water-soluble base material are contained, the ratio of both is 40 to 90 parts by weight of the sublimable base material, preferably 50 parts by weight.
~80 parts by weight, 10 to 60 parts by weight, preferably 20 to 50 parts by weight of the water-soluble base.

When a sublimable base material is contained in leather, if the content of the sublimable base material is less than 20% by weight, the shape of the molded product is likely to collapse when it comes into contact with urine and/or washing water. It is also difficult to control the dissolution rate. On the other hand, if the content of the sublimable base material exceeds 80% by weight, the content of the solid acid, which is an active ingredient, will decrease, and the scale prevention effect will not be sufficient. In addition, when both a sublimable base material and a water-soluble base material are contained, if the content of the sublimable base material is less than 40% by weight with respect to the total amount of the sublimable base material and the water-soluble base material, sublimation will occur. It becomes difficult to form a continuum of the flexible base material, and swelling and deformation are likely to occur. On the other hand, if it exceeds 90% by weight, the sublimation suppressing effect of the sublimable base material by the water-soluble mixed layer will be insufficient, it will be difficult to control the dissolution rate, and it will not lose its shape if left in the atmosphere for a long time. (Become.

Even if the content of the sublimable base material is less than 40% of the total amount of the sublimable base material and the water-soluble base material, the water-soluble base material has a high spatial degree and a high melting point, and the sublimable base material If the substance is mixed uniformly with the material, it will not swell or lose its shape. Furthermore, even if the sublimable base material is 40% or more, if the water-soluble base material has a low density and a low melting point and is difficult to mix uniformly with the sublimable base material, swelling or deformation may occur. Depending on the sublimable base material, the content of the sublimable base material must be increased.

Furthermore, the present invention provides a long-term effect as a scale inhibitor by containing 20% by weight or more of a slowly soluble and/or poorly soluble solid acid and/or a base material in addition to the easily soluble solid acid. I found a way to make it last.

Here, the easily soluble solid acid refers to ammonium chloride, sodium hydrogen sulfate, sulfamic acid, and the like. On the other hand, slow-soluble solid acids and base materials refer to those having a saturation solubility in water at 20°C of 0.2 to 20 g/100 g, and examples of such solid acids include succinic acid, boric acid, adipic acid, Salicylic acid, brassicylic acid, hydrocinnamic acid, maleic anhydride, etc., which have good pressure moldability or are easily melted by heating are preferable, and as a base material, tetrachlorobiphenyl,
Methyl tetronal oxalate, a solid nonionic surfactant having an HLB of 10 to 14, and the like are preferred. These slowly soluble solid acids and/or base materials may be used singly or as a mixture of two or more.

In addition, poorly soluble solid acids and base materials refer to those with a saturation solubility in water of 20°C of 0.001 to 0.2 g/100 g, and examples of such solid acids include isophthalic acid, speric acid, and cumin. The base material is preferably santonin, L-menthol, phenyl salicylate, resorcinol, benzhydrol, or a solid nonionic surfactant having an HLB of 6 to 10. These poorly soluble solid acids and/or base materials may be used singly or as a mixture of two or more.

When the content of the slow-soluble solid acid and/or base material (hereinafter referred to as slow-soluble component) or the slightly soluble solid acid and/or base material (hereinafter referred to as poorly-soluble component) is less than 20% by weight, the molded article While in contact with urine and/or washing water, the shape tends to collapse, making it difficult to control the dissolution rate. If the slowly soluble or poorly soluble component is a strong solid acid, there is no upper limit to the content of the slowly soluble or poorly soluble component, but if the slowly soluble or poorly soluble component is a base material and a weakly acidic solid acid. The content thereof is preferably 80% by weight or less. In addition, if the easily soluble solid acid used in combination is a fine powder, it will easily lose its shape when it comes into contact with urine and/or washing water even if the content of slowly soluble or poorly soluble components is 20% by weight or more. . Therefore, the particle size of the easily soluble solid acid is preferably about 0.1 to 1 fl, while the finer the slowly soluble or poorly soluble component is, the more preferable it is.

A dissolution rate regulator can be added to the molded product for the purpose of adjusting the dissolution rate of the molded product in water.

Examples of the dissolution rate regulator include poorly water-soluble substances that can be heated to form a uniform molten mixture with the base material or solid acid, such as fatty acids, higher alcohols, etc., or t8
Fine powders of aqueous substances such as calcium stearate, magnesium stearate, talc, etc. can be used.

Corrosion inhibitors are added for the purpose of preventing corrosion of toilet drain pipes. As the corrosion inhibitor, acid-resistant cationic surfactants such as alkylthioureas are preferably used.

In order to mask bad odors and give off a fragrance, we use various adjusting fragrances, as well as water-insoluble fragrances for the purpose of preventing molded objects from being colored by urine, etc., detecting the remaining amount of molded objects, and coloring washing water. or water-soluble colorants can be added to the molded body.

It is also possible to add a type of bactericidal agent that does not affect the purified seed bacteria or an amount that has a negligible effect, and an ion sequestering agent that does not cause an economic burden.

In the scale inhibitor of the present invention, the solid acid dissolves in the urine and/or washing water when the molded product is placed directly or in various containers and brought into contact with urine and/or washing water, and remains in the toilet drain pipe. The pH of the urine or the mixed waste water of urine and washing water is maintained at a low value, and as a result, the adhesion of scale to the drain pipe is prevented.

The pH of urine or mixed waste water of urine and washing water can be adjusted by adjusting the dissolution rate, shape, number of scale inhibitors used, structure of the container in which the scale inhibitor is stored, etc.

The dissolution rate of the scale inhibitor can be adjusted by selecting the type and amount ratio of the acidic substance used, the base material, etc., and by using a dissolution rate regulator.

Furthermore, when used in a container, the dissolution rate can also be adjusted by selecting the opening area of the container.

In particular, in the case of molded products that are to be placed directly into men's restrooms, it is required that they have an appropriate melting rate and that they do not undergo significant deformation such as disintegration or swelling due to contact with urine and/or washing water. .

Next, a method of using the molded article of the present invention will be described below.

In the case of a molded article containing a sublimable base material or a slowly soluble component, places that come into contact with urine and/or wash water intermittently, such as the entrance of the toilet drain pipe, the wash water flow path on the inner wall surface and bottom of the toilet bowl, It can be installed in places such as under the faucet of a low tank with a hand-washing section. On the other hand, in the case of molded articles containing poorly soluble components, they may be submerged in urine and/or wash water reservoirs, such as toilet traps, drain pipes, wash water drain pipes, wash water storage tanks, etc. can be installed.

Furthermore, the molded body can be placed directly or housed in a container, but if a container is used, a container with a structure appropriate to the properties of the molded body is selected. In the case of a molded article containing a sublimable base material, a container with a structure that allows sufficient vapor diffusion of the sublimable substance, specifically a container with a large opening area that allows sufficient contact with the outside air, and a container that does not contain slowly soluble or poorly soluble components. In the case of a molded body containing the same, a structure is required that allows sufficient contact between the molded body and running water or standing water. In addition, in the case of a molded product that does not contain a sublimable base material or slow-soluble or poorly soluble components, that is, a molded product that consists only of easily soluble components, the structure must be such that the contact between the molded product and running water or standing water is restricted. Bye.

Containers that can adjust the amount of dissolution by bringing intermittent running water into contact with molded bodies include containers installed in low tanks with faucets for hand washing, as disclosed in Japanese Utility Model Application Publication No. 54-143038 and Japanese Utility Model Application Publication No. 54-111.
62154, etc., and containers to be installed in the flush water flow path in the toilet bowl are described in Utility Model Application Publication No. 50-11347, Utility Model Application Publication No. 51-115737, etc.

Further, as a container for gradually dissolving a solid drug in a flush water reservoir of a toilet, containers described in Japanese Utility Model Application Publication No. 49-133461, Japanese Utility Model Application Publication No. 52-130462, etc. can be used. Containers installed in the trap section, drain pipe, and water storage section may also have the same structure as the container for the wash water storage tank.

[Effect]

The inventors of the present invention conducted intensive research on a method for preventing scale from adhering to toilet drain pipes, and found that the scale was composed of calcium apatite (Cas (POJ:+OH) 4
0-60ut%, calcium carbonate CCaCO5) 20-
40wt% and 10-30wt% of water-insoluble organic matter; calcium-based scale has a pH of 7.
．． It does not precipitate in water with a pI of 5 or less, and very little precipitation occurs in water with a pI (in the range of 7.5 to 8.5).Also, it takes a long time to precipitate, and urine or urine and washing water do not precipitate. The present invention was completed based on the discovery that mixed wastewater produces ammonia due to the action of urine degrading enzymes and bacteria, resulting in an increase in p++ in a short period of time.

Urine usually contains 200 to 3 water-soluble calcium ions.
00 ppm, 'J 7 acid ion is 2ooo~250
Contains 0ppH1. Further, carbonate ions are contained in the washing water, and are replenished by dissolving carbon dioxide gas in the atmosphere. The pH of urine excreted from the body is approximately 5.5 to 6.5, but when left in the atmosphere, the pH gradually increases and eventually reaches 9 to 9.5.

When 9H exceeds 7.5, turbidity occurs, and as p)I increases, the turbidity increases, and when pt+ exceeds 8.5, a white precipitate of calcium apatite is deposited, and carbonate is formed on the surface in contact with the atmosphere. Calcium crystals form in a film. These calcium apatite and calcium carbonate crystals, along with organic substances such as water-insoluble proteins produced by the action of bacteria and enzymes, stick to the toilet drain pipe and grow into scale, commonly called urinary stones.

Therefore, by maintaining the pH of urine or mixed wastewater of urine and wash water at 8.5 or less, preferably 7.5 or less, it is possible to prevent scale from adhering to the toilet drain pipe. 8 pn of urine or mixed wastewater of urine and washing water
．． As a method for maintaining the value at 5 or less, a method of dissolving an acidic substance in urine and/or washing water is simple and preferably employed.

The scale inhibitor for toilet drain pipes of the present invention is a molded product containing a solid acid as an active ingredient, and when brought into contact with urine and/or washing water, the solid acid is eluted and mixed with urine or urine and washing water. Maintain drain pH at low levels.

Toilets may not be used for long periods of time, such as on holidays, so in order to maintain the pH of the urine remaining in the drain pipes or the mixed wastewater of urine and wash water at a low level even during such periods, it is necessary to use solid acid. Ammonium salts having a strong acidic group exhibiting pH buffering properties are preferably used. however,
The solubility of the salt produced by reacting with calcium in water is O,
001g/100g (water) or less is not preferred.

On the other hand, if the pl+ of urine or mixed waste water of urine and washing water is too low, corrosion of the drain pipe becomes a problem, which is not preferable.

Therefore, the preferable lower limit of the pH of urine or mixed waste water of urine and washing water is 5, more preferably 5.5. Furthermore, it is preferable to add a corrosion inhibitor to the scale inhibitor in advance.

In the scale inhibitor of the present invention, urine and/or
Alternatively, by using a molded product containing a sublimable base material as a scale preventive agent installed in a place where it comes into contact with washing water, the dissolution rate can be easily adjusted and the scale preventive agent is uniformly dissolved without deformation or swelling.

A molded body is obtained.

In particular, when a sublimable base material alone or a sublimable base material and a water-soluble base material are used together, the easily water-soluble solid acid is wrapped in the sublimable base material or the sublimable base material and the water-soluble base material, and It has a structure in which a sublimable base material that is poorly soluble in water forms a continuum.

Therefore, if the scale inhibitor is left in the atmosphere,
The sublimable base material on the surface is sublimated, and a porous solid acid that is easily soluble in water or a mixed layer of a solid acid and a water-soluble base material is formed on the surface. In this state, when urine and/or washing water comes into contact with it, even a small amount of contact water will melt and remove the mixed layer of water-soluble substances formed on the surface, and the surface will be covered again with the poorly water-soluble sublimable base material. A continuous layer is formed and dissolution of the solid acid or solid acid and water-soluble substrate in the urine and/or wash water is stopped.

Due to the above mechanism, sublimation and dissolution are repeated, so only the parts that come into contact with water selectively dissolve and are not deformed, and are consumed uniformly while retaining their initial shape. In addition, even if it comes into continuous contact with urine and/or washing water for a long period of time, the surface is covered with a layer of a sublimable base material that is hardly water-soluble, so that softening and deformation due to swelling and water absorption are prevented.

Furthermore, if the contact with urine and/or wash water ceases continuously for a long time, the water-soluble solid acid or mixed layer of solid acid and water-soluble substrate formed on the surface will reduce the limit of the sublimable substrate. sublimation is suppressed and deformation is prevented. The effect of suppressing the sublimation of a sublimable substance is greater in a mixed layer of a solid acid and a water-soluble base material than in a solid acid alone, so if the base material is left in the air for a long time, it will be more difficult to suppress sublimation than a molded body made of a sublimable base material alone. However, a molded article using a combination of a sublimable base material and a water-soluble base material has a greater effect in preventing deformation.

Scale sticks to toilet drain pipes due to the decomposition of urine, so if the toilet is used continuously, scale will stick and the time required for urine to decompose will be a problem. If you use the toilet intermittently, scale buildup is more likely to occur. Since the scale inhibitor of the present invention is dissolved by the mechanism described above, scale fixation is less likely to occur. When toilets are used continuously, low concentrations of solid acids and water-soluble substrates are dissolved; when toilets that are prone to scale buildup are used intermittently after long periods of time, high concentrations are dissolved. Because the solid acid and water-soluble base material are dissolved, it effectively prevents scale from sticking to toilet drain pipes.

A molded article made of a slowly soluble component and a solid acid is also preferably used as a scale inhibitor installed in a place where it may come into contact with urine and/or washing water intermittently. If the content of the slowly soluble component in the molded product is less than 20% by weight, it will be difficult to adjust the dissolution rate of the molded product and to maintain its shape during use. In addition, if the slowly soluble component is a weakly acidic solid acid or a substance other than a solid acid, if the content of the slowly soluble component exceeds 80% by weight, the content of the active ingredient solid acid will decrease and the toilet drain pipe If sufficient scale prevention is not performed, the amount of water used will increase.

Compared to scale inhibitors based on sublimable substances, scale inhibitors consisting of slowly soluble components and solid acids have the disadvantage that they deform when they come into contact with running water during use. By selecting, it is possible to widely adjust the dissolution rate, and it is possible to adjust the dissolution rate widely, and it is possible to use toilets that are prone to drain scale, such as toilets without cleaning equipment or toilets that use little flushing water, or toilets that are used infrequently. It has properties that make it particularly suitable as a scale inhibitor for toilets.

A molded article made of a poorly soluble component and a solid acid is preferably used as a scale inhibitor that is submerged in urine and/or washing water. If the content of the poorly soluble component in the molded product is less than 20% by weight, it will be difficult to adjust the dissolution rate and maintain the shape during use. In addition, if the poorly soluble component is a weakly acidic solid acid or a substance other than solid acids, if the content of the poorly soluble component exceeds 80% by weight, the content of the active ingredient solid acid will decrease, causing scale in toilet drain pipes. The amount used is large for sufficient prevention.

A scale preventive agent consisting of a poorly soluble component and a solid acid, or a scale preventive agent having a similar dissolution rate depending on the structure of the container containing it, is submerged in the trap section, in the urine in the drain pipe, or in the accumulated water of urine or mixed wastewater of urine and washing water. When installed in a water tank, the urine in the water decomposes, and as the pH of the water rises, the concentration of solid acid eluted from the scale preventive agent into the water also increases. In toilet drain pipes, scale is most likely to be generated in the trap section at the entrance of the drain pipe, and in the water retention areas within the drain pipe, so this anti-scaling agent is an efficient anti-scaling agent with little waste. be.

When the scale preventive agent is installed in a wash water storage tank, the scale preventive effect and chemical efficiency are lower than when the scale preventive agent is installed in a urine or urine/wash water mixed drainage reservoir such as a trap.

This anti-scaling agent has the disadvantage that it is difficult to know when to add the agent because it is installed in locations that are difficult to observe from the outside, such as in the drain pipe pool, trap, and wash water storage tank. It is an excellent anti-scaling agent that prevents drainage pipe scale from sticking without causing any discomfort.

In the case of a scale preventive agent that submerges a molded article containing a solid acid as an active ingredient in a water reservoir, the solid acid solution is at a higher temperature than that of a scale inhibitor that brings the molded article containing a solid acid as an active ingredient into contact with intermittent flowing water. There is a high possibility that it will flow into the drain pipe and corrode the drain pipe. It is desirable to contain a sparingly soluble component that can provide an appropriate dissolution rate depending on the usage conditions of the toilet, and to add a sufficient amount of a corrosion inhibitor.

〔Example〕

The present invention will be explained in more detail by way of examples. However, the scope of the present invention is not limited in any way by the following examples.

Reference Example 1 Fresh urine of 2700 mN (pH = 6.
was added and mixed uniformly. Divide this urine into 6 equal parts, each 50 ml
The sample was subjected to the following treatment, and the change in p)l and the amount of water-insoluble matter produced were measured.

Each sample was kept at 20±3°C during the measurement period.

Sample 1: Add sulfamic acid and adjust the PL to 5.5 Sample 2: Continuously inject 1% sulfamic acid aqueous solution from the automatic titrator and adjust the pH to 7.2 ± 0.2 Sample 3: From the automatic titrator , 1% sulfamic acid aqueous solution was continuously injected to adjust the pH to 8.2 ± 0.2 Sample 4: 1% sulfamic acid (comparison) from an automatic titrator
Aqueous acid solution was continuously injected to adjust the pH to 8.8±0.2 Sample 5: Disinfectant; 0.5 g of benzalkonium chloride (comparison) was added Sample 6: Untreated (comparison) Elapsed time for each sample Table 1 shows the changes in pH and the amount of water-insoluble matter produced (g/l).

Table 1 Example 1 (Production of scale inhibitor) Sample 1; Melted polyethylene glycol with a molecular weight of 6000; 4
60 parts by weight of sulfamic acid powder was added and mixed to 0 parts by weight to obtain a molten slurry. The slurry was poured into an empty container of a commercially available toilet antifouling agent and solidified to produce a scale inhibitor.

Sample 2: Sulfamic acid powder; 60 parts by weight, Baladichlorobenzene fine powder; 40 parts by weight, and calcium stearate;
A mixture consisting of 1 part by weight was pressure molded to produce a spherical molded body with a diameter of 40 m.

Sample 3: A mixture consisting of 50 parts by weight of sodium hydrogen sulfate monohydrate fine powder, 50 parts by weight of sulfamic acid powder, and 4 parts by weight of calcium stearate was press-molded into a diameter of 40 nm.
A spherical molded body was produced.

Sample 4: A mixture consisting of 50 parts by weight of sulfamic acid powder and 50 parts by weight of fine benzoic acid powder (saturated solubility 0.25 g/100・20°C) was press-molded into a disk shape with a diameter of 45 mm and a thickness of 200 mm. manufactured a body. The opening area of the molded body is 1 of the surface area.
It was stored in a urinal-shaped container with a concentration of 2%.

Sample 5: Polyoxyethylene monostearate (nonionic surfactant HLB 11.6): I 0 parts by weight, 2
．． 60 parts by weight of sulfamic acid powder was added and mixed to a molten mixture of 30 parts by weight (4.2',4'tetrachlorobiphenyl) (saturated solubility 0.29 g/100 g/20°C) to obtain a molten slurry. The slurry was injected into a mold and solidified to produce a disc-shaped molded body with a diameter of 45 mm and a thickness of 2 Q mm, and this was housed in a perforated container similar to Sample 3.

Sample 6: Sulfamic acid powder: 40 parts by weight, isophthalic acid fine powder (saturated solubility: 0.012g/100g/20°C): 6
A mixture consisting of 2 parts by weight of a 50% ethyl alcohol solution of 0 parts by weight of alkylthiourea (g anti-aging agent) was pressure molded to produce circular tablets with a diameter of 301 m and a thickness of 300 m.

Sample 7: Resorcin (saturation solubility; 0.05g/100g・20
℃) 140 parts by weight, sorbitan monopalmitate (nonionic surfactant HLB 6.7) = 10 parts by weight, alkylthiourea (corrosion inhibitor); A molten slurry was obtained. The slurry was poured into a mold and solidified to produce circular tablets with a diameter of 30 mm and a thickness of 30 mm.

Comparative sample 1: An ethyl oxide-propylene oxide copolymer (nonionic surfactant) that is solid at room temperature was heated and melted, injected into a mold, and then cooled and solidified to produce a spherical molded body with a diameter of 40 mm. .

Comparative sample 2: A deodorizing and anti-scaling agent containing a commercially available disinfectant and nonionic surfactant as active ingredients.

(Performance test) Three men's urinals were regularly flushed once an hour with flush water from a 10β flush water tank. Each urinal in 10 toilets was washed with hydrochloric acid containing a corrosion inhibitor. A cylindrical test piece made of stainless wire mesh and an iron piece measuring 20 m x 7 Q mm x lIm were installed in the trap section under the perforated plate of each toilet bowl.

Place the previously manufactured scale preventive agent in the container of Sample 1 in the wash water tank, and use the upper and lower liquid levels of the wash water tank to dissolve the scale preventive agent in the wash water and prevent scale from sticking. went.

In addition, Samples 2 and 3 and Comparative Samples 1 and 2 were placed in the urinal, Samples 4 and 5 were placed in the urinal, and Samples 6 and 7 were placed in the urinal trap and dissolved in urine and washing water. Prevented scale from sticking.

For samples 2, 6.7 and comparative samples, two pieces were used at the same time, and for other samples, one piece was used.

In order to eliminate errors due to the frequency of toilet use, the test piece, iron piece, and drug were changed every two weeks, and tests were conducted in all 10 toilets for two weeks each.

For each drug, a new drug was added when the weight of the drug became 20% or less of the initial value.

Under the above conditions, the amount of scale adhesion to the wire mesh and the amount of corrosion of the iron pieces were measured.

In addition, the pH of the mixed wastewater of urine and washing water in the trap is 1. The pH of the septic water tank is 1 before using the chemical and 1 week after the start of using the chemical.
l+ and COD (■/β) were measured.

The results of each measurement are shown in Table 2.

In Table 2, each symbol represents the following.

Offensive odor: ○: Almost no offensive odor △: Slightly offensive odor ×: Offensive odor The amount of scale adhesion, amount of corrosion of iron pieces, and effective days of use are the average of three toilets for each toilet.

Example 2 (Production of scale inhibitor) Sample 1: 30 parts by weight of Balajichlorobenzene and 2 parts by weight of polyethylene glycol (molecular fi: 6000) were heated and melted, and further, 50 parts by weight of sulfamic acid fine powder was added. A molten slurry was obtained.

This molten slurry was poured into a mold and cooled and solidified to produce a spherical molded body with a diameter of 4 (In).

Sample 2 A mixture of fine powders of 20 parts by weight of naphthalene, 10 parts by weight of ethylene oxide/propylene oxide copolymer (nonionic surfactant), and 0 parts by weight of nia sulfamic acid was press-molded to a diameter of 400 parts. A spherical molded body was produced.

Sample 3 Balajichlorobenzene; 25 parts by weight, ethylene oxide/propylene oxide copolymer (nonionic surfactant): 10 parts by weight, and polyethylene glycol (molecular weight: 1000); 5 parts by weight were melted by heating, and then cooled and solidified. Then, it was further finely pulverized to obtain a mixed powder. The mixed powder; 4
A mixture of 0 parts by weight, 260 parts by weight of sodium sulfate monohydrate powder, and 1 part by weight of calcium stearate was pressure-molded to produce a spherical molded body with a diameter of 40 m.

Comparative Sample 1 An ethylene oxide/propylene oxide copolymer (nonionic surfactant) was molded in the same manner as Sample 1 to produce a spherical molded body with a diameter of 40 mm.

Comparative Sample 2 A toilet drain pipe scale prevention/deodorizer containing a commercially available disinfectant, nonionic surfactant, and fragrance.

(Performance test 1) Three men's urinals were regularly flushed once every hour with flushing water from the molding tank of 101.Each urinal in six toilets (one was blank) was cleaned. The samples were cleaned using hydrochloric acid containing a corrosion inhibitor, and a scale adhesion prevention test was conducted using each of the samples prepared above.

A cylindrical test piece made of stainless wire mesh and a piece of iron measuring 2 Qmm x 7 Qux lm were placed in the trap section under the perforated plate of each toilet bowl, and the amount of scale adhering to the wire mesh and the amount of corrosion of the iron piece were measured.

In order to eliminate errors due to the frequency of toilet use, the test piece, iron piece, and drug were changed every four weeks, and tests were conducted in all six toilets for four weeks each.

Two of each drug were directly put into the toilet bowl, and when the weight of the drug became 20% or less of the initial value, a new drug was added.

The results of each measurement are shown in Table 3.

In Table 3, each symbol represents the following.

Offensive odor: 0; No offensive odor Δ; Slight offensive odor The toilet was installed and the status of soiling and bad odor of the toilet bowl was observed.

In addition, the pH and COD of the purified water tank were measured before using the drug and one week after the start of using the drug.

Six toilets were tested (one was left blank) with separate aeration-type septic tanks installed. In both cases, 2 men and 2 men
Targeted at 100 households.

The test results are shown in Table 4.

In Table 4, each symbol represents the following.

Toilet bowl soiling: O; No soiling △; Slightly soiled ×; Stains and foul odor: ○; No foul odor Δ; Slightly foul odor ×; Offensive odor [Effect of the invention] In the present invention, as shown in Reference Example 1, p++
When pH is 8.5 or less, very little precipitate is formed, and when pH is 7.5 or less, no precipitate is formed. Therefore, the pH of urine or mixed wastewater of urine and wash water
By adjusting and maintaining the ratio to 8.5 or less, preferably 7.5 or less, it is possible to prevent scale from sticking to the toilet drain pipe.

In the present invention, by using a solid acid as the active ingredient of the scale inhibitor, the solid acid is dissolved in urine and/or washing water, as shown in the above example, and the pu is maintained at a low level, and as a result,
Prevents scale from sticking to drain pipes.

Furthermore, when the scale inhibitor of the present invention is used, corrosion of drain pipes is extremely small, and the function of the septic tank is not adversely affected.

In the example, a specific example of a men's restroom with a cleaning device was shown, but a men's restroom without a cleaning device,
Similar results can be obtained in unisex toilets with cleaning equipment.

INDUSTRIAL APPLICABILITY The present invention provides a scale preventive agent suitable for preventing scale buildup in toilet drain pipes, and has extremely great public health and industrial significance.

Applicant (430) Nippon Soda Co., Ltd. Agent (6286) Haruyuki Ito (7125) Yoshimi Kaade

Claims (4)

[Claims] (1) A scale inhibitor for toilet drain pipes comprising a molded article containing a solid acid as an active ingredient and optionally a base material and/or other additives. (2) The scale inhibitor for toilet drain pipes according to claim 1, wherein the molded article contains a solid acid, and a sublimable base material and/or a water-soluble base material. (3) Solubility in water at 20°C is 0.2-20g/1
The scale inhibitor for toilet drain pipes according to claim 1, characterized in that it contains a solid acid and/or a base material of 0.00 g. (4) Solubility in water at 20°C is 0.001-0.2
The anti-scaling agent for toilet drain pipes according to claim 1, characterized in that it contains a solid acid and/or a base material in an amount of 100 g/100 g.