JPH101995A - Scale preventive method of toilet drain pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the fixing of scales onto a toilet drain pipe simply and economically by adding an acidic substance to urine and/or flushing water and holding the pH of urine or the mixed drain of urine and flushing water within a specific range. SOLUTION: An acidic substance is added to urine and/or flushing water, and the pH of urine or the mixed drain of urine and flushing water is held in 5-7.5. The acidic substance, which is not formed by the reaction of salt having solubility of 0.01g/100g (water) or less to water within a range of pH 5-7.5 when the acidic substance is added to urine or the mixed drain of urine and flushing water with calcium ions and can adjust and sustain the pH of urine or the mixed drain of urine and flushing water within the range of 5-7.5, is used as the acidic substance at that time. Mineral acids such as hydrochloric acid, sulfuric acid, nitric acid, etc., organic acids such as acetic acid, hydroxyacetic acid, citric acid, etc., water-soluble acid salts such as sodium hydrogensulfate, potassium hydrogensulfate, etc., are used.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing scale of a toilet drainpipe, and more particularly, to a method for preventing scale containing calcium as a main component from sticking to a toilet drainpipe. The method of the present invention can be applied to any of various types of flush toilets or men's toilets without flush facilities.

[0002]

2. Description of the Related Art Toilet drain pipes, especially drain pipes for men's toilets, produce scales called urinary stones to which a mixture of calcium-based compounds and organic substances formed by the decomposition of urine is formed, and urine and urine are discharged. The flow of washing water is deteriorated, and in extreme cases, the drain pipe is closed, and the toilet becomes unusable.

[0003] In addition, the organic matter in urine stones is spoiled by bacteria and produces an odor. The bad smell of men's toilets is a mixed smell of ammonia generated by decomposition of urine and odor caused by decomposition of organic matter. Conventionally, as a method for preventing the scale of a toilet drain pipe, a method of injecting a drug into the middle of a flush water pipe and a method of putting a spherically shaped drug into a toilet of a men's toilet have been put to practical use.

As agents used in these methods, various agents containing a surfactant, a bactericide and a fragrance have been proposed. For example, a deodorant cleaner for a flush toilet made by melt-mixing a surfactant, an ion-sequestering agent, a fragrance, etc. with polyethylene glycol or polypropylene glycol and an aromatic substance and injecting and molding the same is disclosed in
No. 0706. Japanese Patent Publication No. 17205/1972 discloses an automatic cleaning agent for flush toilets mainly comprising an ethylene oxide / propylene oxide copolymer which is a nonionic surfactant. further,
As a method of removing the scale once stuck to the toilet drain pipe, a method of dissolving the scale using an inorganic strong acid such as hydrochloric acid, and a method of mechanically removing the scale by removing a toilet bowl are adopted.

[0005]

The use of a conventionally used chemical comprising a surfactant, a bactericide and a fragrance is effective in preventing the toilet bowl wall from being stained and generating an odor. However, the effect of preventing the scale from sticking to the toilet drainage pipe is not sufficient, and the flow of the bactericide into the septic tank hinders the action of the septic tank bacteria and reduces the purification ability of the septic tank.

[0006] The use of a cleaning deodorant comprising a surfactant and a fragrance is also effective for preventing dirt on the toilet wall and preventing generation of offensive odor. However, the effect of preventing the scale from sticking to the toilet drain pipe is even smaller. The method of adding an ion sequestering agent to urine or washing water is quite effective in preventing scale sticking.

However, in order to completely prevent sticking of the scale, it is necessary to add 0.3 to 1% by weight of an ion sequestering agent to urine. Generally, ion sequestering agents are expensive and this method is not widely available. In addition, dissolving and removing the fixed scale with a strong acid and mechanically removing the fixed scale by removing the toilet bowl are uncomfortable and difficult operations. In addition, in the scale removal with a strong acid, corrosion of the drainage pipe by the acid or the reduction of the purification ability by the acid flowing into the septic tank causes a problem of damage to the toilet and the drainage pipe in the mechanical removal. An object of the present invention is to provide a simple and economical method for preventing scale from sticking to a toilet drain pipe.

[0008]

SUMMARY OF THE INVENTION The present invention is a method for preventing scale of a toilet drainage pipe, wherein the pH of urine or a mixed drainage of urine and washing water is adjusted and maintained at 5 to 7.5. . In the present invention, pH adjustment and maintenance of urine or mixed waste water of urine and washing water are performed by adding an acidic substance to urine and / or washing water.

When the acidic substance is added to urine or mixed waste water of urine and washing water, a salt having a solubility of 0.01 g / 100 g (water) or less in water having a pH of 5 to 7.5 is converted to calcium ion. Can be used that can be adjusted and maintained in the range of 5 to 7.5, which is not generated by reacting with water and the pH of urine or mixed waste water of urine and washing water is in the range of 5 to 7.5. For example, hydrochloric acid,
Mineral acids such as sulfuric acid and nitric acid, organic acids such as acetic acid, hydroxyacetic acid, succinic acid, benzoic acid and citric acid, water-soluble acidic salts such as sodium hydrogen sulfate, potassium hydrogen sulfate and ammonium hydrogen sulfate, ammonium chloride and ammonium sulfate Water-soluble salts of strong acids and weak bases and sulfamic acid can be mentioned. These acidic substances can be used alone or as a mixture of two or more.

As a method and an apparatus for adding and dissolving an acidic substance in urine and / or washing water and adjusting and maintaining the pH thereof, known methods and apparatuses conventionally used for adding various chemicals to toilets. Can be used. For example, an automatic injection device for aqueous solutions of acidic substances,
Installed in the toilet flush water tank or flush water piping,
A method in which a fixed amount of an aqueous solution of an acidic substance is poured into the wash water every time the wash water flows out, a molded body containing an acidic substance that is solid at room temperature such as a solid acid is placed in a container, and the wash water tank or the wash water flow A method for dissolving an acidic substance by placing it in a waterway and contacting with washing water, and placing the molded body in a toilet bowl of a men's toilet, and directly contacting urine or washing water to remove the acidic substance A dissolution method or the like can be adopted. A more specific method will be described below.

A certain amount of a liquid substance is injected into a washing water tank by using the upper and lower surfaces of various washing water tanks proposed and practically used in Japanese Utility Model Application Publication No. 53-124266. The apparatus is filled with an aqueous solution of an acidic substance and placed in a washing water tank. Each time the washing water flows, a certain amount of an aqueous solution of an acidic substance is injected into the washing water, and the pH of the mixed waste water of urine and the washing water is adjusted and maintained within a certain range.

It has been proposed in Japanese Utility Model Laid-Open Nos. 51-125840 and 53-134540, etc., and is connected to the middle of a washing water pipe which has been put into practical use. An apparatus for automatically injecting a liquid drug into the washing water can also be used. In this case, the pH of the mixed drainage of urine and washing water can be adjusted and maintained even in a toilet where no washing water tank is installed.

A container for dissolving a solid cleaning agent, which is proposed in Japanese Utility Model Laid-Open No. 49-133461, Japanese Utility Model Laid-Open No. 52-130462, etc., in washing water in a washing water tank, has been proposed. A molded body containing a solid acid or the like as an acidic substance is housed in a washing water tank, the solid acid or the like is dissolved in the washing water, and the pH of the mixed waste water of urine and washing water is adjusted and maintained. be able to.

Further, a method of containing a molded body containing a solid acid or the like as an acidic substance in a container, bringing the molded body into contact with water from a faucet for hand washing, and collecting water in which the solid acid or the like is dissolved in a low-water washing tank (actual method). Published Japanese Utility Model Application No. 54-143038;
No. 4,162,154) and a method of disposing a container containing a molded body containing a solid acid or the like as an acidic substance in a flush water flow channel in a toilet bowl and dissolving the solid acid or the like in the wash water. No. 50-11347, Japanese Utility Model Laid-Open No. 51-11
No. 5737) can be used to adjust and maintain the pH of the mixed wastewater of urine and washing water.

In the method using an aqueous solution of an acidic substance, by selecting the concentration of the aqueous solution and the injection amount,
Adjust and maintain the pH of the mixed wastewater of urine and washing water. A surfactant, a fragrance, a coloring agent, a corrosion inhibitor, and the like may be added to the aqueous solution of the acidic substance, if desired. It is also possible to add a bactericide of a type that does not affect the septic tank bacterium, or a negligible amount of the effect, and an ion-sequestering agent that does not burden the economy.

A molded article containing an acidic substance which is solid at room temperature, such as a solid acid, is a molded article comprising an acidic substance, a base material, and additives optionally added. As additives, dissolution rate regulator, surfactant, fragrance, colorant, corrosion inhibitor,
Disinfectants, ion sequestering agents and the like can be mentioned. As the acidic substance which is solid at room temperature, various salts, organic acids and sulfamic acid among the above-mentioned acidic substances are used.

Substrates such as paradichlorobenzene, naphthalene, etc., and water-soluble polymers which are solid at room temperature, such as polyethylene glycol,
Polypropylene glycol, various surfactants and the like are used. These molded articles are prepared by mixing powder and / or granular components and compressing them, heating the mixture of the components,
It can be produced by a known molding method such as a method in which a molten slurry is poured into a mold and cooled and solidified.

As the dissolution rate regulator, fine powder of a water-repellent substance can be used. For example, calcium stearate, magnesium stearate and the like are preferably used. By adjusting the dissolution rate, shape, number of used, etc. of the molded body, the urine or the mixed drainage of urine and washing water
H can be adjusted and held. The dissolution rate of the molded article can be adjusted by selecting the type and amount ratio of the acidic substance and the base material to be used, and using a dissolution rate regulator.

In particular, in the case of a molded article which is used by being directly put into a men's toilet, one having an appropriate dissolution rate and not causing significant deformation such as collapse or swelling upon contact with urine and / or washing water. Required. As a molded article for these uses, a mixture of a powder of an acidic substance which is a solid at normal temperature and a fine powder of paradichlorobenzene is formed into a tablet and a mixed melt of paradichlorobenzene and a water-soluble polymer. A slurry obtained by adding and mixing the powder of (1) into a desired mold and cooling and solidifying is preferably used.

[0020]

The present invention and the like have made intensive studies on a method for preventing the scale from sticking to the toilet drainpipe. As a result, the scale was found to be calcium apatite [Ca ₅ (PO ₄ ) ₃ OH].
40-60 wt%, calcium carbonate [CaCO ₃ ] 20
-40 wt% and organic matter insoluble in water 10-30 wt%
, The calcium-based scale does not precipitate in water having a pH of 7.5 or less, and extremely little even in water having a pH in the range of 7.5 to 8.5. The present inventors have found that it takes time, and that urine or a mixture of urine and washing water generates ammonia and increases the pH in a short time due to the action of urinary decomposing enzymes, thereby completing the present invention.

In urine, usually, 200 to 300 ppm of water-soluble calcium ions and 2000 to 2 parts of phosphate ions are contained.
Contains 500 ppm. Further, carbonate ions are contained in the wash water, and carbon dioxide gas in the atmosphere is dissolved and supplied. The pH of urine excreted from the body is about 6 to 6.5, but when left in the air, the pH gradually increases and eventually reaches 9 to 9.5. When the pH becomes 7.5 or more, turbidity occurs, and the turbidity increases as the pH increases, and the pH rises to 8.
If it is 5 or more, a white precipitate of calcium apatite precipitates, and crystals of calcium carbonate are formed in a film on the contact surface with the atmosphere. The crystals of calcium apatite and calcium carbonate adhere to the toilet drainpipe together with organic substances such as water-insoluble proteins generated by the action of bacteria and enzymes.
It grows into a case commonly called urinary stone.

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

Since the toilet may not be used for a long time on holidays or the like, the pH of the urine or the mixed waste water of the urine and the washing water retained in the drain pipe is maintained at 8.5 or less even during that period. As the acidic substance, those having an ammonium salt as an acidic substance and having a strong acid radical exhibiting a pH buffering property are preferably used. However, it is not preferable to use an acidic substance in which a salt formed by reacting with calcium has a solubility in water of 0.01 g / 100 g (water) or less. On the other hand, if the pH 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 preferred lower limit of the pH of the mixed waste water with urine or washing water is 5,
More preferably, it is 5.5.

[0024]

The present invention will be described in more detail with reference to examples. However, the scope of the present invention is not limited at all by the following Examples.

EXAMPLE 1 Three liters of fresh urine (pH = 6.35) were collected, and the following treatments were performed on each 500 ml sample divided into six equal parts to determine the change in pH and the amount of water-insoluble matter produced. It was measured.
Each sample was kept at 20 ± 3 ° C. during the measurement period. Sample 1: A 1% aqueous solution of sulfamic acid was continuously injected from an automatic titrator to adjust the pH to 7.2 ± 0.2, and held. Sample 2: A 1% aqueous solution of sulfamic acid was continuously injected from an automatic titrator to obtain a pH of 8. Sample 3 (comparison): A 1% aqueous solution of sulfamic acid was continuously injected from an automatic titrator to adjust the pH to 8.8 ± 0.2, and held Sample 4 (comparison): sterilization Agent: benzalkonium chloride 0.5
g was added Sample 5 (comparative): untreated Table 1 shows the change in pH and the amount of water-insoluble matter produced (g / l) in each sample over time.

[0026]

[Table 1]

Example 2 Each of the urinals of five places where three men's urinals are regularly cleaned once an hour with a flush water from a 10-liter flush water tank was filled with a corrosion inhibitor. Was washed with hydrochloric acid, and the scale was prevented from sticking by the following method.

Specification 1: 0.6 m each time washing water flows out
A commercially available chemical supply container designed to supply 1 l of liquid chemical to a washing water tank, a corrosion inhibitor containing 35% hydrochloric acid and a cationic surfactant (manufactured by Ibit Asahi Chemical) 1
% Was added to the medicine, and the medicine was placed in the washing water tank, and the medicine was periodically supplied to the washing water. Specification 2: Sulfamic acid powder; 60 parts by weight Paradichlorobenzene fine powder; 40 parts by weight and a mixture of calcium stearate; 2 parts by weight; , Urine and washing water.

Specification 3 (comparison): a drug supply container having the same specifications as the drug supply container used in specification 1, a disinfectant benzalkonium chloride; 20% and an ethylene oxide-propylene oxide copolymer (nonionic surfactant) An aqueous solution containing 10% was filled therein, placed in the washing water tank, and the chemical was supplied to the washing water periodically. Specification 4 (comparison): A spherical molded body 1 having a diameter of 40 mm produced by heating and melting a solid ethylene oxide-propylene oxide copolymer (nonionic surfactant) at room temperature, injecting it into a mold, and solidifying it by cooling. The pieces were placed in a urinal and dissolved in urine and washing water. Specification 5 (comparison): blank.

A cylindrical test piece made of stainless steel wire mesh and a 20 mm × 70 mm × 1 mm
Was set, and the amount of scale attached to the wire net and the amount of corrosion of the iron piece were measured. Further, the pH of the mixed wastewater of urine and washing water in the trap, the pH of the septic tank water before the use of the drug and one week after the start of the use of the drug, and the COD were measured. In order to eliminate the error due to the frequency of use of the toilets, the test pieces, iron pieces and chemicals were changed every three weeks, and the test was performed in all five toilets for three weeks. For Specifications 1 and 3, the drug was replenished every three weeks. In the specifications 2 and 4, a new drug was additionally introduced when the weight of the drug became 20% or less of the initial value. Table 2 shows the measurement results.

In Table 2, each symbol represents the following. Toilet wall dirt: ◎; no dirt ○; almost no dirt △; slightly dirt x; dirt bad odor: ◎; no bad odor ○; almost no odor △; slightly odor x;

[0032]

[Table 2]

[0033]

According to the present invention, as shown in Example 1, when the pH of urine is 8.5 or less, very little precipitate is formed, and when the pH is 7.5 or less, almost no precipitate is formed. do not do. Therefore, by adjusting and maintaining the pH of urine or mixed waste water of urine and washing water at 8.5 or less, preferably 7.5 or less, it is possible to prevent scale and sticking to the toilet drain pipe. This is more apparent in the specific example of the urinal of the men's toilet shown in the second embodiment.

Further, in the method of the present invention, corrosion of the drainage pipe is extremely small, and the function of the septic tank is not adversely affected. In the embodiment, a specific example of a men's toilet with a washing device is shown. However, similar results can be obtained in a men's toilet without a washing device and in a unisex toilet with a washing device. The present invention provides a method capable of preventing the toilet drain pipe from sticking to the scale by a simple method, and its public health and industrial significance are extremely large.

Continuation of the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location C02F 5/10 610 C02F 5/10 610Z

Claims (4)

[Claims] An acidic substance is added to urine and / or washing water to adjust the pH of urine or mixed waste water of urine and washing water to 5 to 5.
A method for preventing scale of a toilet drainage pipe, wherein the scale is maintained at 7.5. 2. The method according to claim 1, wherein the acidic substance is a mineral acid, an organic acid, a water-soluble acid salt, a water-soluble salt of a strong acid and a weak base, and sulfamic acid. 3. The method for preventing scale of a toilet drain pipe according to claim 1, wherein a molded body containing a solid acid as an active ingredient is housed in a container and installed in a washing water tank or a washing water flowing channel. 4. The method for preventing scale of a toilet drain pipe according to claim 1, wherein the molded body containing a solid acid as an active ingredient is disposed in a men's toilet bowl.