JPS6121200A - Scale preventing agent and prevention - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a scale preventive agent, and more specifically, the present invention relates to a scale preventive agent, and more specifically, it gradually dissolves a scale preventive active ingredient in the water of water supply and drainage piping, and removes dissolved substances and suspended substances in the water. The present invention relates to a scale inhibitor that prevents scale that is formed by depositing and fixing on pipe walls for a long period of time.

The scale inhibitor of the present invention can be used not only as an inhibitor for scale generated in toilet drain pipes and traps, but also as a scale inhibitor for drain pipes in kitchens, bathrooms, etc., and cooling water piping for air conditioners. can.

[Conventional technology]

The formation of scale in the piping system causes blockages in the water supply and drainage system,
reduce its function or cause it to cease; For example, in the drainage system of a toilet, calcium and organic matter in urine can precipitate and stick to form a scale called urinary stone, which can block the drain pipe, making the toilet unusable, and causing a foul odor. Become.

Generally speaking, methods for removing scale generated in water supply and drainage systems include dissolution using strong inorganic acids and physical removal using mechanical equipment, but neither method can completely remove scale. It is extremely difficult.

One way to prevent scale formation is to dissolve a small amount of a chemical substance that is effective in preventing scale formation into water supply and drainage water. For example, a method in which a water-soluble solid or liquid mainly composed of a surfactant is stored in a suitable container and immersed in running water to dissolve the surfactant into the water, or a method in which a chemical injection device is installed in the middle of the piping, and the liquid is submerged in water. There is a method of forcibly injecting a chemical solution that is effective in preventing scale, and it was published in Japanese Patent Application Laid-Open No. 59-56.
Publication No. 499 discloses that a surfactant that is solid at room temperature and a softening prevention component mainly composed of an alkali metal salt of stearic acid are melt-mixed, and a molded product is molded into a men's toilet bowl,
A method has been proposed in which it is placed in a water tank for washing.

[Problem that the invention seeks to solve]

In the conventional techniques mentioned above, it is difficult to control the rate of dissolution in water when a surfactant is used, and when a chemical injection device is used, it is difficult to control the injection device and its installation. It requires construction work and is extremely difficult to put into practical use. Furthermore, in products that use an anti-softening agent, if the amount of anti-softening agent used is excessive, the amount of surfactant eluted will be too small, making it difficult to produce a sufficient scale-preventing effect. If the amount of agent used is too small, it will lose its shape and block the entrance of the water supply and drainage pipe. That is, it is extremely difficult to control the type of surfactant, the type of softening inhibitor such as calcium stearate, and the ratio of their amounts.

An object of the present invention is to provide a scale inhibitor that is effective for a long period of time and does not lose its shape during its effective period, and a method for using the same, which solves the technical problems of the prior art.

[Means for solving problems]

The present invention provides a scale preventive agent formed by molding a scale preventive active ingredient using paradichlorobenzene as a base material, and a scale preventive agent formed by molding the scale preventive active ingredient into the water Kp of a water supply and drainage system or the water flowing into the system. This is a scale prevention method in which the scale is installed in a place where the water and the atmosphere alternately come into contact with each other.

In the present invention, the scale-preventing active ingredient is a substance that can increase the solubility of scale-forming components present in water and prevent scale precipitation and fixation on piping systems, or
Any substance can be used as long as it can change the surface condition of the pipe wall, prevent scale precipitation and fixation, and can be mixed with paradichlorobenzene and molded.

Examples of the former include solid acids, chelating agents, and the like, and surfactants have the effects of both. These can be used alone or as a mixture of two or more. As a solid acid, it is solid at room temperature, and
Acidic substances that can react with calcium, the main component of scale, to form salts with a water solubility of 0.01f/100f (water) or higher, such as sulfamic acid, sodium hydrogensulfate, ammonium hydrogensulfate, potassium hydrogensulfate, etc. can be used. Also, as a chelating agent,
For example, sodium ethylenediaminetetraacetate, sodium nitrilotriacetate, etc., which form a water-soluble chelate compound with calcium ions, can be used. As the surfactant, any surfactant can be used as long as it is solid at room temperature or can be mixed uniformly with paradichlorobenzene in a molten state, but preferably a nonionic surfactant is used. do. Examples include propylene oxide/ethyleneoquinde copolymer, polyoxyethylene nonylphenol ether, alkyltrimethylammonium bromide, and the like.

In the present invention, paradichlorobenzene used as a base material does not need to be particularly pure, and may be mixed with other sublimable substances or water-soluble substances. however,
Contamination with non-sublimable water-insoluble substances is not desirable.

In the present invention, the scale inhibitor may contain a dissolution rate retardant, a deodorant, a coloring agent, a thickener, a corrosion inhibitor, etc. in addition to the scale inhibiting active ingredient, paradichlorobenzene. The dissolution rate retarder is added to adjust the dissolution rate of the scale-preventing active ingredient, and for example, water-repellent fine powders such as calcium stearate, magnesium stearate, and talc are preferably used. Deodorizers are added to mask bad odors and create a fragrance, and various fragrances are used. Because it has a deodorizing effect on radichlorobenzene, even a very small amount of fragrance can produce a large deodorizing effect. The coloring agent is used in the melt method, which is one aspect of the manufacturing method of the additive inhibitor, to prevent the scale inhibitor from being colored by urine etc. and causing discomfort. It is added for the purpose of giving viscosity to molten dichlorobenzene in order to prevent it from settling in the atmosphere. Mixable surfactants, polyethylene glycol, etc. are used. Corrosion inhibitors are added for the purpose of preventing corrosion of piping systems due to scale-preventing active ingredients, for example,
When a solid acid is used as a scale-preventing active ingredient, various acid-resistant corrosion inhibitors such as polyamines are used.

In the present invention, the content of paradichlorobenzene in the scale inhibitor is 10 to 90% by weight, preferably Id:
31) to 70% by weight, and the content of the scale-preventing active ingredient is 90 to 10% by weight, preferably 70 to 30% by weight, although it varies depending on the type.

In the present invention, the scale inhibitor is a scale inhibitor,
It is a molded product of a mixture consisting of paradichlorobenzene and optionally added additives, and has shapes such as spherical, cubic, cylindrical, cylindrical, disc, conical, pyramidal, animal and plant shapes, etc. It is a molded body of any shape. ) In particular, spherical molded bodies are preferably used.

The scale inhibitor of the present invention can be manufactured by various molding methods. For example, paradichlorobenzene ground to 42 meshes or less, preferably 60 meshes or less, and a powdered scale-inhibiting active ingredient and optionally
There is a method in which additives are mixed and pressure molded. In this method, since the crushed paradichlorobenzene powder re-solidifies within a short time, it is immediately mixed with other ingredients after crushing, and made into a granular composition by a method such as spray crushing. It is preferable to take measures such as pressure molding the composition. In addition, 7 (radichlorobenzene)
To the molten dichlorobenzene heated to a temperature of 0 to 80° C., a scale-inhibiting active ingredient and optionally added additives, preferably 10 to 30% by weight based on the dichlorobenzene described above, are added. It is also possible to adopt a method in which a thickener is added to form a molten slurry, and the molten slurry is injected into a mold for molding. In this method,)
(If the heating temperature of radichlorobenzene exceeds 80°C, the evaporation rate will be too high and it will be difficult to handle.
If it is below 0°C, the solidification rate will be too fast and it will be difficult to pour it into a mold. If the powder component to be mixed with molten dichlorobenzene has a large particle size, it will tend to settle.
It is preferable to use it by pulverizing it to a particle size of 100 mesh or less. As mentioned above, surfactants, polyethylene glycol, etc. can be used as thickeners added for the purpose of preventing sedimentation of powder components, but it is preferable to use nonionic surfactants, which are active ingredients for preventing scale. Due to the scale prevention effect,
The same substance can have both of the thickening effects. Furthermore, the scale inhibitor can also be produced by a method in which the molten slurry produced by the above method is first granulated and the granulated product is pressure-molded. In this method, the molten slurry may be solidified into flakes using a flaker or the like, and then granulated by pulverization, or granulated by dropping the molten slurry into cold air.

Although small amounts of additive components such as fragrances and dissolution rate retardants can be added to the molten slurry, their effects are more effectively exhibited when they are added and mixed with the granules.

The scale inhibitor of the present invention can be applied to a water supply and drainage system, such as a water storage tank, or to a place where water entering the system alternately comes into contact with the atmosphere, such as a toilet bowl in a men's toilet, or an air conditioner. It is used by installing it in the water tray of a water cooling tower, etc.

[For production]

As a result, the scale-preventing active ingredient precipitates on the surface, and the precipitated scale-preventing active ingredient dissolves in the water, preventing scale from adhering to the water supply and drainage piping system. A molded article based on paradichlorobenzene has extremely high shape retention in the atmosphere and running water, and generally maintains its initial shape until the paradichlorobenzene sublimes and disappears. That is, by using paradichlorobenzene as a base material, the school preventing active ingredient is slowly released into flowing water over a long period of time until paradichlorobenzene sublimes and disappears. For example, if the toilet is installed in a men's toilet where running water flows intermittently, paradichlorobenzene will sublimate when not in use, and the porous surface will be effective at preventing scale. When the ingredient layer becomes attached and then comes into contact with urine or washing water, the active ingredient for preventing scale will be removed.
It dissolves easily in a small amount of urine or washing water, and new paradichlorobenzene appears on the surface. When paradichlorobenzene appears on the surface, the elution of the scale-preventing active ingredient stops.
Sublimation of paradichlorobenzene begins again. In this way, by alternately sublimating paradichlorobenzene and dissolving the effective scale-preventing ingredient in water, it becomes possible to prevent scale over a long period of time. In particular, the scale-preventing active ingredient can be directly dissolved at the highest concentration in urine, which has the highest concentration of scale-forming components, and the generation of scale can be prevented even when washing water is not flushed. Scale in the toilet drain pipes is generated when urine components are decomposed and concentrated due to the action of bacteria and long-term contact with the air. This is more likely to occur when used sparingly. Therefore, it is not necessary to elute the scale-preventing active ingredient in proportion to the number of people using the toilet. Since the scale inhibitor of the present invention has the elution mechanism of the scale inhibiting active ingredient as described above,
In the case of a toilet that is used by a large number of people in a short period of time, only a low concentration of the active anti-scaling ingredient will dissolve; in the case of a toilet that is used by a small number of people intermittently over a considerable period of time,
Because it dissolves a high concentration of scale-preventing active ingredients, it effectively prevents the formation of scale and reduces the variation in the effective period of the scale-preventing agent depending on the number of users. If the content of paradichlorobenzene is less than 10 wt%, not only the outflow rate of water-soluble components is too fast, but also it is difficult to maintain the dosage form, which is not preferable. Also, if it exceeds 90wt%,
The amount of the scale-preventing active ingredient that can be contained is only small, and its dissolution rate becomes too slow, making it impossible to produce an effective scale-preventing effect. therefore,
The content of paradichlorobenzene is 30 to 70 wt%
It is preferable that

The scale preventive agent of the present invention can be a molded product of any shape as described above, but if it is spherical or similar, the contact with the container is a point contact, so it will block the perforated plate and cause urine and washing water to flow out. Furthermore, even if urine or wash water comes into direct contact with the anti-scaling agent, the scattering outside the toilet bowl is minimized. In addition, when installing at the water supply/hand washing port of a household toilet water tank or the water supply port of various toilet water tanks, it is desirable to have a spherical shape in consideration of water scattering and the like.

Since the scale inhibitor of the present invention has the action described in detail above, it can be preferably installed in running water containing a large amount of air, for example, in a water tray of a cooling water tower for air conditioning equipment, or Alternatively, install it in a place where water flows intermittently, such as inside the toilet bowl mentioned above, the water supply/hand washing port of the toilet water tank, the water supply port of the toilet water tank, the drain port of the kitchen sink, the drain port of the bathroom, etc. This prevents scale formation in these water supply and drainage pipe systems for a long period of time.

〔Example〕

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

Examples 1 to 3 and Comparative Examples 1 to 3 Stir 100 parts by weight of a mixture in which the ratio of the scale-preventing active ingredient to paradichlorobenzene pulverized to 60 mesh or less and the type of the scale-preventing active ingredient were varied. A mixture to which 1 part by weight of calcium phosphate was added was pressure-molded to produce a spherical molded body with a diameter of 40 m.

Table 1 shows the types of scale-preventing active ingredients used and their quantitative ratios to paradichlorobenzene.

Example 4 A mixture consisting of 50 parts by weight of a propylene oxide/ethylene oxide copolymer that is solid at room temperature and 50 parts by weight of paradichlorobene was heated to 75°C to melt it and poured into a mold to form a spherical molded body with a diameter of 401 m. was manufactured.

Comparative Example 4 A mixture consisting of 90 parts by weight of propylene oxide/ethylene oxide copolymer, which is solid at room temperature, and 10 parts by weight of sodium stearate was heated to 75°C to melt it and poured into the same mold used in Example 4. A spherical molded body with a diameter of 40 cm was produced.

Comparative Example 5 A mixture consisting of 40 parts by weight of propylene oxide/ethyl t, zy oxide copolymer, 60 parts by weight of sulfamic acid, and 1 part by weight of calcium stearate, which is solid at room temperature, was
The mixture was melted by heating to 5°C and poured into the same mold as used in Example 4 to obtain a spherical molded body with a diameter of 40 mm.

Test Examples The molded bodies manufactured in Examples 1 to 4 and Comparative Examples 1 to 5 were
After removing dirt from the drain pipe and toilet bowl, two of each were placed in the men's toilet bowl, and the toilet was used normally.
The state of soiling of the drain pipe and toilet bowl was observed after a day. The test results are shown in Table 1 along with the blank results.

In Table 1, toilet bowl soiling indicates the condition of the drain pipe inlet trap section and the inside of the drain pipe 30 days after the injection of the molded product into the following three levels.

○: No stain Δ: Slight stain ×: stain In addition, the deformation of the molded body is also indicated in the following three stages.

○: No deformation Δ: Deformation ×: Significant deformation Table 1 Example 5 Paradichlorobenzene: 30 parts by weight, powdered sulfamic acid: 60 parts by weight, and polyoxyethylene dinonylphenyl ether which is solid at room temperature: 10 parts by weight. The molten slurry obtained by heating the mixture consisting of the above to 75° C. was made into 7 rakes with a thickness of about Im using a 7 raker. 1 part by weight of calcium stearate was added to 100 parts by weight of the granulated product obtained by crushing and granulating the flakes, and the mixture was then pressure-molded in the same manner as in Example 1 to obtain a spherical molded body having a diameter of 40 cm.

Two of these molded bodies were placed in a men's toilet bowl from which stains had been removed from the drain pipe and toilet bowl, and thereafter, two pieces were continued to be added every month for regular use. During observation after 6 months had passed since the start of flushing, the blank toilet bowl showed 3~3~
It was observed that scale with a thickness of 5 haze was attached to the drain pipe, but the toilet bowl into which the molded product had been placed was slightly stained, but no scale was observed. The number of days required for the input molded object to disappear is 32 to 4
It was the 5th.

〔Effect of the invention〕

As shown in the test results in Table 1 and Example 5, the scale inhibitor of the present invention has excellent shape retention, dissolves the scale-preventing active ingredient over a long period of time, and prevents scale adhesion. To prevent.

In the example, we have shown an example where it is installed in the toilet bowl of a men's restroom, but it can also be used in a water supply and drainage system that has intermittent running water, similar to the men's restroom, and a water supply and drainage system that has running water that also comes into contact with the atmosphere. Similar effects can be obtained by using

In the present invention, a scale preventive agent containing a scale preventive active ingredient as a main ingredient has been provided, but by changing the active ingredient, the method of the present invention allows a small amount of the chemical to be applied to a large amount of flowing water for a long period of time, such as disinfecting wastewater from a septic tank. It is expected that it will be applied to the field of stably dissolving over a period of time.

The present invention provides a scale inhibitor that is easy to use and can prevent scale from adhering to water supply and drainage system piping for a long period of time, and has industrial and public health significance. is extremely large.

Claims (8)

[Claims] (1) A scale preventive agent formed by molding a scale preventive active ingredient using paradichlorobenzene as a base material. (2) The scale-preventing active ingredient is a solid acid, a chelating agent,
The scale inhibitor according to claim (1), which is one kind of surfactant or a mixture of two or more kinds thereof. (3) The scale inhibitor according to claim (1), wherein the content of paradichlorobenzene is 10 to 90% by weight. (4) The scale inhibitor according to claim (1), which is a press-molded product of a homogeneous mixture consisting of a scale-inhibiting active ingredient, powdered paradichlorobenzene, and optionally added additives. (5) Claim No. 1, which is a molded product obtained by molding a molten slurry of a scale-preventing active ingredient, paradichlorobenzene, and optionally added additives, by mold injection.
) Scale inhibitors listed in section (6) The scale inhibitor according to claim (1), which is a press-molded product of granules comprising a scale-inhibiting active ingredient, paradichlorobenzene, and optionally added additives. (7) A scale preventive agent formed by molding a scale preventive active ingredient using paradichlorobenzene as a base material is installed in the flowing water of a water supply and drainage system or in a place where the water that joins the system comes into contact with the atmosphere alternately. , a method for preventing scale in water supply and drainage systems, which is characterized by gradually dissolving a scale-preventing active ingredient in a scale-preventing agent into flowing water. (8) The method for preventing scale according to claim (7), wherein the installation location of the scale preventive agent is inside the toilet bowl of the men's restroom.