JP3374992B2 - Scale remover and removal method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a solid medicine used for removing scales formed on wall surfaces of men's urinals and drainage pipes connected thereto.

[0002]

2. Description of the Related Art Scales derived from urine often have an inorganic compound derived from calcium mainly contained in urine as a main component, and these are generally called urinary stones. This scale called urinary stone is particularly liable to be generated in the drainage pipe and the urinal, and when it is accumulated, it causes a bad odor. Therefore, the scale removal work is often performed at intervals of 1 to 2 years. As a method of removing the scale, a method of bringing a drug that dissolves the scale into contact with the scale is generally used.

Strong acids such as hydrochloric acid have been well known as scale dissolving agents. In particular, sulfamic acid is a strong acid comparable to sulfuric acid, hydrochloric acid, etc., but its corrosiveness to metals is remarkably lower than those, so that there are many proposals to use sulfamic acid as a scale removing agent. For example, Japanese Unexamined Patent Publication (Kokai) No. 3-12500 proposes a scale removing agent obtained by press-molding a mixed powder of sulfamic acid and boric acid.

[0004]

Hydrochloric acid has an excellent scale-dissolving power, but hydrochloric acid has a difficulty in practical use because it easily corrodes the metal material of piping and requires special care in handling. Solid sulfamic acid is used as an aqueous solution because it does not dissolve urinary stones as it is, but if this aqueous solution is prepared in advance, hydrolysis of sulfamic acid will proceed during storage, so this aqueous solution Causes alteration. Further, it is also effective to use powdery or granular sulfamic acid, which is usually supplied as an industrial chemical, as an aqueous solution by dissolving it in water immediately before use, but not only it takes time to dissolve it, but a tool for that is also required. age,
Not a simple method. Further, it is possible to use a method in which sulfamic acid powder is added to the wash water that flows out each time the toilet bowl is used, but since this wash water is usually completely discharged within a time of about 2 to 4 minutes, it was added. Since the powder of sulfamic acid is not sufficiently dissolved, it is washed away with the washing water, and this method is not efficient.

The tablet produced by the method of press-molding sulfamic acid and boric acid whose particle size is adjusted, as proposed in the above-mentioned Japanese Patent Laid-Open No. 3-12500, has sufficient hardness and is put into a urinal for men. When it does, it completely dissolves and disappears in about 1 day,
And, in the toilet bowl after disappearance, almost no adhesion of scale is seen, and it is an excellent scale remover, but if boric acid is not contained in the molded body in an amount of 20% by weight or more, a tablet having stability in water can be obtained. Absent. Since the molded product containing a large amount of boric acid has a low sulfamic acid content, not only the efficiency of scale removal is lowered, but also the surface of the molded product is easily damaged during transportation, which is a practical difficulty.

Cellulose derivatives such as carboxymethyl cellulose and hydroxypropyl cellulose and synthetic polymer compounds such as polyethylene glycol and polyvinyl alcohol are excellent binders, which are mixed with sulfamic acid and pressure-molded. The tablets obtained as described above are swelling and disintegrate immediately when they come into contact with water, and thus the generated lumps flow out together with the washing water without being dissolved, and the amount of the drug that effectively acts to remove scale is inefficient. .

In a normal men's flush urinal, a trap structure is provided at a portion midway from the drain port to the drain conduit. Then, about 1 to 4 liters of cleaning water always stays in the trap portion, and the water in the trap portion stops the flow of the foul odor flowing upside down through the conduit. Normally, the toilet is used about once every 10 to 30 minutes, so when a solid scale remover is installed in the trap, an effective amount of sulfamic acid dissolves in the trap's accumulated water within this time. It is desired that the urinary stone is completely dissolved by this aqueous solution of sulfamic acid within 1 to 2 days or to such an extent that the washing water is well distributed.

The present invention is a molded product containing sulfamic acid powder as a main ingredient and having a high scale removal efficiency, and has a high dissolution rate of sulfamic acid in water and stability such that it does not disintegrate in water. It is an object of the present invention to provide an improved scale removing agent in which the surface is not damaged even by transportation.

[0009]

The scale removing agent of the present invention comprises 100 parts by weight of sulfamic acid powder having a particle size smaller than 16 mesh but larger than 200 mesh, and sucrose fatty acid having a particle size smaller than 60 mesh but larger than 300 mesh. 100-800 mixed powder consisting of ester powder 2-30 parts by weight
Obtained by molding at a pressure of kg / cm ² .

Then, the scale remover is applied to the trap of the urinal of the men's toilet, the part of the urinal of the men's toilet that comes into contact with the wash water, the wash water in the high tank of the men's toilet, or the pipe of the urinal wash water. In this case, the scale attached to the urinal or its trap can be removed efficiently. The sulfamic acid used in the present invention may be an industrial product which is usually commercially available in the form of powder. The particle size of the powder particles is preferably smaller than 16 mesh but larger than 200 mesh, and particularly preferably larger than 100 mesh.

The sucrose fatty acid ester used is a fatty acid ester of sucrose obtained by an ester formation reaction between a hydroxyl group of sucrose and a carboxyl group of a fatty acid, and has the property of a polyhydric alcohol nonionic surfactant. . Particularly, it is an ester of sucrose and a fatty acid having 8 to 20 carbon atoms, and has an HLB value of 1 to 20, more preferably 1
Sucrose fatty acid esters having an HLB value of -10 are preferred.
The particle size of the sucrose fatty acid ester is preferably smaller than that of sulfamic acid and smaller than 60 mesh but larger than 300 mesh.
Such sucrose fatty acid ester can be easily obtained as a commercially available industrial product.

The mixed powder of sulfamic acid and sucrose fatty acid ester is prepared by using an ordinary mixer with 100 parts by weight of the sulfamic acid powder and 2 to 30 parts of sucrose fatty acid ester powder.
It is easily obtained by thoroughly mixing parts by weight, preferably 5 to 20 parts by weight. As this mixed powder,
A small amount of auxiliary agents such as stearic acid as a release agent, salts thereof, talc and the like may be contained, and an anticorrosive agent, a colorant and the like may be contained.

The scale removing agent of the present invention is preferably a mixed powder of the sulfamic acid powder and sucrose fatty acid ester powder, which is preferably 100 to 800, using a conventional pressure molding machine.
Obtained by molding at a pressure of kg / cm ² . The shape of the molded product is not particularly limited, and may be spherical, disc-shaped, columnar,
The shape may be arbitrary, such as a conical shape or a shape having a through hole.

[0014]

[Working] It was found that an improved scale inhibitor can be obtained by press-molding a mixed powder of the sulfamic acid powder and the sucrose fatty acid ester powder. This surprising effect is probably due to the above mixing, sucrose fatty acid ester particles finer than the sulfamic acid particles are present between the sulfamic acid particles, and the sucrose sandwiched between the sulfamic acid particles during the pressure molding. The fatty acid ester particles change to have fluidity under pressure, and the surfaces of the sulfamic acid particles are coated with the fluidized sucrose fatty acid ester. Then, when the molding pressure is released, it is considered that the sucrose fatty acid ester present between the sulfamic acid particles is turned into a solid again and acts as a strong binder for solidifying adjacent sulfamic acid particles. In fact, the surface of the anti-scale agent of the present invention has a good gloss, and when it is placed in water and brought into contact with water, the anti-scale agent does not show disintegration.

However, when the amount of the sucrose fatty acid ester powder used is less than 2 parts by weight based on the sulfamic acid powder, it is not effective, and the molded product obtained by using such a small amount easily disintegrates in water in a short time. . The amount of the sucrose fatty acid ester powder that is surely effective is 5 parts by weight or more based on the sulfamic acid powder, but the molded body obtained by using as much as 30 parts by weight or more of the sucrose fatty acid ester powder is Since the content of sulfamic acid is low, the dissolution rate of sulfamic acid in water is reduced, and the scale removal efficiency is reduced.

The pressure applied during the molding of the mixed powder is
It is convenient to avoid the wear of the molding machine as low as possible, but at 100 kg / cm ² or less, the molded product obtained by molding at such a low pressure does not exhibit sufficient hardness. However
Pressures as high as 800 kg / cm ^{2 and} above should be avoided. To preferably mold a molded product with sufficient hardness, 200 to 6
A pressure of around 00 kg / cm ² is advantageous.

In order to obtain a scale removing agent having a high dissolution rate, the smaller the particle size of the sulfamic acid powder used, the better. However, the smaller the particle size, the more easily powdering occurs in the molding operation. It is also important to prevent dusting when molding the mixed powder, and sulfamic acid powder having a particle size smaller than 16 mesh but larger than 100 mesh is preferably used.

[0018]

EXAMPLE A sulfamic acid powder having a particle size smaller than 16 mesh but larger than 150 mesh, a commercial sucrose fatty acid ester having a particle size smaller than 60 mesh but larger than 300 mesh and an HLB value of 6 and smaller than 60 mesh. A boric acid powder having a particle size greater than 200 mesh was prepared.

By mixing these mixed components into the composition shown in Table 1 in a mixer, the mixed powders used in the examples of the present invention of Nos. 1 to 3 and the comparative examples of Nos. 4 to 7 were mixed. The mixed powder used for was prepared. Then, these mixed powders,
By using a cylindrical die having a diameter of 30 mmφ and molding at a pressure of about 600 kg / cm ² , each tablet was molded into a cylindrical tablet of 20 g.

Next, the hardness and the stability in water of these tablets were measured. The hardness is a value measured by a Kiya type hardness meter. The stability in water is indicated by a cross mark when the tablet was put into 100 ml of water in a beaker and the disintegration occurred after 1 hour, and a cross mark when the disintegration did not occur. The results of these measurements are shown in Table 1. Table 1 No. sexual performance sulfamic acid sucrose mixed-Powder set formed tablets agent fatty acid ester the boron acid Hardness water stability (Parts by weight) (parts by weight) (parts by weight) (kg) 195 5 0 13.5 〇 290 10 0 22.5 〇 3 80 20 0 50 or more 〇 4 95 0 5 9.0 × 590 0 10 10 12.0 × 6 80 0 20 18.0 ○ 7 70 0 30 28.0 ○ The tablets of the present invention of Nos. 1 to 3 in Table 1 have sufficient hardness and stability in water without defects in appearance.

Nos. 4 and 5, in which boric acid was used instead of sucrose fatty acid ester, did not have stability in water even when 10% of boric acid was contained, and as shown in Nos. 6 and 7, in water. In order to exert stability, it is necessary to contain boric acid in an amount of 20% or more.

[0022]

According to the present invention, an improved scale removing agent having sufficient hardness and stability in water can be obtained only by press-molding a mixture of sulfamic acid powder and a small amount of sucrose fatty acid ester. be able to. Since this scale removing agent is mainly composed of sulfamic acid,
It is effective in removing scale called urinary stones. And this scale remover, in the trap of the urinal of the men's toilet,
The urinary stones can be removed efficiently by installing the part in contact with the wash water in the urinal of the men's toilet, the wash water in the high tank of the men's toilet, or the pipe of the wash water of the urinal.

─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-3-12500 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) C11D 7/60 C11D 17/00 C11D 17 / 06

Claims (2)

(57) [Claims] 1. A mixed powder comprising 100 parts by weight of a sulfamic acid powder having a particle size smaller than 16 mesh but larger than 200 mesh, and 2 to 30 parts by weight of a sucrose fatty acid ester powder having a particle size smaller than 60 mesh but larger than 300 mesh. A scale remover formed by molding at a pressure of 100 to 800 kg / cm ² . 2. The scale removing agent according to claim 1 in a trap of a urinal of a men's toilet, in a portion of the urinal of a men's toilet that comes into contact with wash water, in a wash water of a high tank of a men's toilet, or in a small amount. A method for removing scale adhering to the above-mentioned urinal or trap, which is characterized in that it is installed in the pipe of toilet flush water.