JP2005187889A - Additive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an additive capable of controlling the dissolving rate in water with a simple method. <P>SOLUTION: The first additive is composed of powder having hardly dissolved in water and granular material containing urethane resin, and is added into water in sealing state sealed in a sealing member made of nonwoven fabric. The first additive is obtained by mixing the powder and the urethane resin dissolved in a solvent, and then drying the mixture and volatizing the solvent. The first additive is formed in almost globular-shape under interweaving and sticking state of the powder and the urethane resin, and the dissolving rate of the powder in water can be controlled up and down. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an additive added to cooling water in a circulating water system, for example.

  In general, a substance that is soluble in water is dissolved in water at a dissolution rate in accordance with its solubility. On the other hand, in building air conditioners and factory heat exchangers, etc., cooling water circulating in cooling towers and pipes of circulating cooling water systems has a scale of metal corrosion, propagation of germs and algae, and inorganic substances. A water treatment agent is added to suppress generation and the like. As a method for adding the water treatment agent, for example, a method of injecting and adding a liquid water treatment agent to the cooling water of the circulating cooling water system using an injection device, or adding a water treatment agent in the form of powder or tablets into the cooling water. The method of adding etc. is mentioned.

  However, the dissolution rate when a substance soluble in water is dissolved in water is determined by the solubility of the substance and the temperature of the water, and other controls are difficult. On the other hand, in the method of adding a water treatment agent using an injection device, in order to adjust the solubility of the water treatment agent in cooling water, a pump for injecting the water treatment agent, a control device for controlling the injection amount, a power source, etc. are required. As a result, there is a problem that the equipment cost becomes high. In addition, when a water treatment agent in the form of a powder or a tablet is used, it is a simple method that can be simply immersed in cooling water, but the solubility in water is not stable, and the function as a water treatment agent is maintained over a long period of time. There was a problem that could not be demonstrated.

  The present invention has been made paying attention to such problems existing in the prior art. The object is to provide an additive capable of adjusting the dissolution rate in water by a simple method.

In order to achieve the above object, the invention according to claim 1 is an additive added to water, and is characterized by comprising granules containing a water-soluble substance and a urethane resin.
According to this structure, dissolution of the substance can be promoted or suppressed by the granule containing the substance soluble in water and the urethane resin. From this, it becomes possible to control the dissolution rate in water up and down by a simple method.

  The gist of the invention described in claim 2 is an additive added to water, which is obtained by mixing a powder of a substance soluble in water and a urethane resin in a solvent and then drying.

With this configuration, it is possible to achieve the same effects as the invention of the first aspect.
Invention of Claim 3 is an additive added to water, Comprising: The granule containing the substance soluble in water and a urethane resin, The enclosure member which consists of a material which lets a 50 micrometer or less substance pass, The said, The gist of the granules is that the particle diameter exceeds 50 μm and is enclosed in the enclosing member.

  According to this configuration, since the particle diameter of the granule is larger than the coarseness of the enclosing member, only the substance contained in the granule can be added to water. For this reason, it is possible to prevent the water quality from being damaged by the urethane resin contained in the granules.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the water-soluble substance is an easily soluble substance having a solubility in water at 20 ° C. exceeding 1%. It is a summary.

With this configuration, dissolution of a substance that is easily soluble in water is suppressed, and the dissolution rate of the powder can be reduced.
The invention according to claim 5 is the invention according to any one of claims 1 to 3, wherein the water-soluble substance is a hardly soluble substance having a solubility in water at 20 ° C. of 1% or less. It is a summary.

With this configuration, the dissolution of the hardly soluble substance in water is promoted, and the dissolution rate of the powder can be increased.
The invention according to claim 6 is summarized in that, in the invention according to any one of claims 1 to 5, the content of the urethane resin is set in a range of 1 to 20%.

With this configuration, the aggregation effect of the granules can be suppressed, and the granular state of the additive can be kept good.
The invention according to claim 7 is the invention according to claim 5 or 6, wherein the substance soluble in the water is added to the cooling water of the open circulation water system, and the water-soluble substance is a corrosion inhibitor, an algicidal agent, and a disinfectant. The gist is to contain at least one selected from scale inhibitors.

  With this configuration, by adding to the cooling water of the open circulating water system, corrosion prevention of metal materials in the cooling tower and cooling piping, algae killing and sterilization of algae and bacteria, and scale adhesion suppression, etc. It can be carried out.

  ADVANTAGE OF THE INVENTION According to this invention, the additive which can adjust the dissolution rate with respect to water by a simple method is realizable.

Hereinafter, an embodiment embodying the additive of the present invention will be described.
The additive of embodiment consists of the granule containing the powder soluble in water and a urethane resin. This additive is preferably used by being added to water in a state where the granules are sealed in a sealing member made of a material having water permeability. The granules are configured such that the dissolution rate of the powder in water is adjusted according to the solubility of the powder. Here, the water-soluble powder includes a substance that is easily soluble in water and a substance that is hardly soluble in water. The dissolution rate means the amount of powder dissolved in water per unit time.

  The powder is composed of one or more kinds of substances that are soluble in water depending on the use of the additive. In the application of the additive, the granule dissolves quickly when the powder is hardly soluble, and slowly dissolves when the powder is easily soluble. Hereinafter, when the additive contains a powder that is hardly soluble in water, the additive is referred to as a first additive. Here, hardly soluble in water means that the solubility in water at 20 ° C. is less than 1%. The solubility of less than 1% indicates that the mass of a substance that can be dissolved in 100 ml of water is less than 1 g. When the first additive is used as a circulating water-based water treatment agent, the powder includes, for example, a corrosion inhibitor that prevents corrosion of metal materials, an algicidal agent that suppresses the growth of algae and bacteria, and sterilization Agents, scale inhibitors that suppress the adhesion of scale, and the like. Examples of the corrosion inhibitor include triazole compounds, thiazole compounds, molybdates, nitrites, phosphates, silicates, borates, nitrates, and the like. In addition, examples of the algicidal agent and disinfectant include quaternary ammonium salts, chlorine compounds, bromine compounds, organic nitrogen compounds, and organic nitrogen sulfur compounds. Examples of the scale inhibitor include polyacrylic acid, polymaleic acid, polymethacrylic acid, polystyrene sulfonic acid, and salts thereof.

  Urethane resin is known as a coating material having excellent water resistance and chemical resistance, and is usually used in a state dissolved in an organic solvent such as methyl ethyl ketone (MEK) or isopropyl alcohol (IPA). In the first additive, the urethane resin exhibits a function as a binder for holding the powder contained in the granules. In this case, the content of the urethane resin is preferably set to 20% or less, more preferably 10% or less, and still more preferably 1 to 2% in order to keep the granular state of the granules good. If the content of the urethane resin exceeds 20%, the granules tend to aggregate and the solubility of the powder contained in the granules may be lowered. Moreover, when content of a urethane resin is less than 1%, a urethane resin cannot fully exhibit the function as a binder, and it becomes difficult to hold | maintain a 1st additive in a granular state. Here, the content% of the urethane resin means% by weight, and indicates the amount added to the powder in a state containing a solvent.

  The first additive is a mixture of a powder consisting of a hardly soluble substance and a urethane resin dissolved in an organic solvent such as methyl ethyl ketone (MEK) or isopropyl alcohol (IPA), and then the mixture is dried. And obtained by volatilizing the organic solvent. The first additive is formed to have a substantially spherical shape in a state where the powder and the urethane resin are entangled and adhered to each other. The first additive is usually formed as granules having a particle size of more than 50 μm, preferably more than 50 μm and less than 100 μm, and has a configuration in which the urethane resin holds a hardly soluble powder.

  The enclosing member is formed into a bag shape from a material having water permeability such as a non-woven fabric, a woven fabric, a knitted fabric, a fabric or a filter. The enclosing member is formed of a material that cannot pass the granules and can pass only a substance such as water having a smaller particle diameter than the granules. For this reason, the first additive encapsulated in the encapsulating member cannot be circulated between the inside and outside of the encapsulating member, and the hardly soluble powder contained in the granule dissolves in water and the inside of the encapsulating member. And can be distributed outside. Therefore, when the particle diameter of the granules is 50 μm, the roughness of the material constituting the encapsulating member is set to less than 50 μm, and more preferably set to less than 25 μm. By setting the coarseness of the eyes smaller than the particle size of the granule and any size, the amount of water passing through the enclosing member can be adjusted to an appropriate amount, and as a result, it is difficult to dissolve in the granule. The solubility of the conductive powder is moderately adjusted.

  The first additive is suitably used as a water treatment agent for cooling water in an open circulation cooling water system. The first additive is used by being immersed in cooling water flowing in the cooling tower or the cooling pipe in a state of being enclosed in the enclosing member. In this case, the first additive causes the hardly soluble powder contained in the granules to gradually dissolve as the cooling water flows through the sealing member, and only the urethane resin remains in the sealing member. It has become. The first additive configured in this manner is adjusted so that the dissolution rate of the hardly soluble powder is adjusted by the urethane resin, and gradually dissolves in the cooling water flowing through the cooling tower and the cooling pipe. .

  Now, the first additive is first immersed in the cooling water flowing in the cooling tower or the cooling pipe while being enclosed in the enclosing member. At this time, since the cooling water flows through the enclosing member, the hardly soluble powder contained in the granule continues to dissolve in the cooling water little by little. At this time, the said granule is hold | maintained with the urethane resin in the state which the cooling water which distribute | circulates the inside of an enclosure member, and a hardly soluble powder contact easily. In this state, the cooling water constantly flows between the granules, whereby the dissolution of the hardly soluble powder contained in the granules is promoted and the dissolution rate of the hardly soluble powder is increased. Thus, after all the hardly soluble powder contained in the granules is dissolved, the granular urethane resin remains in the encapsulating member as the first additive.

  Hereinafter, the additive when the powder is easily soluble in water is referred to as a second additive. Here, the easy solubility in water means that the solubility in water at 20 ° C. is 1% or more. The solubility of 1% or more indicates that the mass of a substance that can be dissolved in 100 ml of water is 1 g or more. The second additive has the same configuration as the first additive except for the powder. However, unlike the first additive, the second additive is configured such that the dissolution of the easily soluble powder is suppressed by the urethane resin, and the dissolution rate of the powder becomes low.

  Now, when the second additive is encapsulated in the enclosing member and immersed in the cooling water flowing through the cooling tower or cooling pipe, the easily soluble powder contained in the granules dissolves in the cooling water. Begin to. At this time, in the second additive, there is a state in which the powder is held by the urethane resin, that is, a state in which the cooling water flowing through the enclosing member and the easily soluble powder are in contact with each other and a state in which the powder cannot be contacted. Coexist. As a result, in the second additive, dissolution of the easily soluble powder contained in the granule is suppressed, and the dissolution rate of the easily soluble powder is lowered.

The effects exhibited by the above embodiment will be described below.
-According to the first additive, by mixing a powder that is hardly soluble in water and a urethane resin dissolved in an organic solvent, and adding the granules obtained by drying the mixture to water, The dissolution of the powder can be promoted, and the dissolution rate of the powder can be increased. In addition, according to the second additive, by mixing a powder easily soluble in water and a urethane resin dissolved in an organic solvent, by using the granules obtained by drying the mixture added to water, The dissolution of the powder can be suppressed, and the dissolution rate of the powder can be reduced. Therefore, if these additives are used, the dissolution rate of the powder in water can be controlled up and down depending on the solubility of the powder contained in the granule. Therefore, when these additives are used, the water dissolution rate can be adjusted by a simple method.

  -A 1st additive is obtained as a granule by mixing the hardly soluble powder and the urethane resin melt | dissolved in the solvent, and drying this mixture. And the 1st additive is added to water in the state which enclosed this granule in the bag-shaped enclosure member. In this case, facilities such as a pump and a power source are not required as compared with a method of adjusting the solubility of the additive using an injection device. For this reason, equipment cost can be omitted and the dissolution rate in water can be adjusted by a simple method.

  -According to the 1st additive, while the particle size of a granule exceeds 50 micrometers, the coarseness of the enclosing member is set to less than 50 micrometers. In this case, since the particle size of the granules is larger than the roughness of the enclosing member, only the hardly soluble powder contained in the granules can be added to water. For this reason, it is possible to prevent the water quality from being damaged by the urethane resin contained in the granules.

  -According to the first additive, by adding to the cooling water of the open circulating water system, corrosion prevention of metal materials in the cooling tower and cooling pipe, algae and sterilization of algae and bacteria, etc. Adhesion suppression or the like can be performed. That is, the first additive can effectively exhibit the function as a coolant treatment agent for a long period of time.

  -According to a 1st additive, the aggregation effect of a granule can be suppressed by setting the content of the urethane resin contained in a granule to 20% or less. For this reason, in a 1st additive, a granular state can be kept favorable.

  -According to the 1st additive, the enclosure member is comprised with the nonwoven fabric. This nonwoven fabric is a material having water permeability and is easy to process. Moreover, since the nonwoven fabric is a material formed by intricately intertwining short and fine fibers compared to woven fabrics, knitted fabrics, etc., it can be less likely to cause clogging due to foreign matters, etc. It can also be easily secured. For this reason, if a granule is enclosed and used for the sealing member which consists of a nonwoven fabric, the 1st additive can fully exhibit the function as an additive, and handling will also become easy.

Hereinafter, test examples and comparative examples embodying the embodiment will be described.
The test samples of Test Examples 1 to 3 shown in Table 1 were prepared by mixing a hardly soluble powder and a urethane resin dissolved in a solvent, and drying the mixture to form granules. In order to add the test samples of Test Examples 1 to 3 to water, each sample was kept placed in a container in which water circulates in a state of being enclosed in an enclosing member for 24 hours. As the powder, a mixture of plural kinds of chemicals used as a water treatment agent was used. As these drugs, those having a solubility in water at 20 ° C. of less than 0.3% were used. As the solvent, an organic solvent such as methyl ethyl ketone (MEK) was used. As the urethane resin, Primer JU-1270 manufactured by Aika Industry was used. As the encapsulating member, a non-woven fabric having a mesh size of less than 50 μm was used, and the non-woven fabric formed into a bag shape was used. At this time, in the container in which the test sample was placed, the water temperature was set to 15 ° C., and the water flow rate was set to 500 ml / min. And before adding to water and after continuing adding for 24 hours, the weight of the test sample was compared, and the dissolution amount% in which the powder contained in the granules was dissolved in water was calculated. In Comparative Example 1, a slightly soluble powder dissolved in an organic solvent was dried and granulated to form a test sample, and the above test was performed.

表１に示すように、試験例１〜３と比較例１とで粉末の溶解量を比較した場合、ウレタン樹脂を含む試験例１〜３は、ウレタン樹脂を含まない比較例１と比べ、前記粉末の水に対する溶解量が高いという結果が得られた。又、試験例１〜３で比較した場合、難溶解性の粉末の溶解量は、ウレタン樹脂の含有量が増えるに従い高くなるという傾向があった。このように、難溶解性の粉末は、ウレタン樹脂と混合したものを顆粒にして水に添加することで、所定時間における溶解量が増えることから、水に対する溶解速度が高くなるという結果が得られた。又、不織布において、不織布の目の粗さが５０μｍであれば、難溶解性の粉末が水に溶けて残存するウレタン樹脂は不織布を通過しないが、不織布の目の粗さが１００μｍになるとウレタン樹脂が不織布を通過してしまうという結果が得られた。又、ウレタン樹脂の含有量が２０％を超えた場合についても試験を行ったが、この場合、顆粒は団子状態となってしまい、難溶解性の粉末の水に対する溶解度が大幅に低下してしまうという結果が得られた。

As shown in Table 1, when the dissolution amounts of the powders were compared in Test Examples 1 to 3 and Comparative Example 1, Test Examples 1 to 3 containing a urethane resin were compared with Comparative Example 1 containing no urethane resin, The result that the amount of powder dissolved in water was high was obtained. Further, when compared in Test Examples 1 to 3, the dissolution amount of the hardly soluble powder tended to increase as the content of the urethane resin increased. In this way, the slightly soluble powder is obtained by mixing the urethane resin into granules and adding it to water, so that the amount of dissolution in a predetermined time increases, resulting in a higher dissolution rate in water. It was. In addition, in the nonwoven fabric, if the nonwoven fabric has a coarseness of 50 μm, the urethane resin remaining after the hardly soluble powder dissolves in water does not pass through the nonwoven fabric, but if the nonwoven fabric has a coarseness of 100 μm, the urethane resin The result of passing through the nonwoven fabric was obtained. In addition, the case where the content of the urethane resin exceeds 20% was also tested. In this case, the granules are in a dumpling state, and the solubility of the poorly soluble powder in water is greatly reduced. The result was obtained.

  The test samples of Test Examples 4 and 5 shown in Table 2 were prepared by mixing an easily soluble powder and a urethane resin dissolved in an organic solvent, and drying the mixture to form granules. As the powder, boric acid (solubility in water at 20 ° C. of about 5%) was used. In Comparative Example 2, boric acid dissolved in an organic solvent was dried and granulated to form a test sample, and the above test was performed. Since the test samples of Test Examples 4 and 5 and Comparative Example 2 are the same as those of Example 1 with respect to the configuration other than the powder, description thereof will be omitted below.

表２に示すように、試験例４、５と比較例２とで粉末の溶解量を比較した場合、ウレタン樹脂を含む試験例４、５は、ウレタン樹脂を含まない比較例２と比べ、前記粉末の水に対する溶解量が低いという結果が得られた。尚、データは示さないが、粉末として塩化カリウム（２０℃の水に対する溶解度が２７．６％）を使用したものを上記試験に供した場合、同様な結果が得られた。又、不織布において、不織布の目の粗さが５０μｍであれば、易溶解性の粉末が水に溶けて残存するウレタン樹脂は不織布を通過しないが、不織布の目の粗さが１００μｍになるとウレタン樹脂が不織布を通過してしまうという結果が得られた。

As shown in Table 2, when the dissolution amounts of the powders were compared in Test Examples 4 and 5 and Comparative Example 2, Test Examples 4 and 5 containing a urethane resin were compared with Comparative Example 2 containing no urethane resin. The result that the amount of powder dissolved in water was low was obtained. Although data are not shown, the same results were obtained when the above powder was tested using potassium chloride (solubility in water at 20 ° C. of 27.6%). Further, in the nonwoven fabric, if the nonwoven fabric has a coarseness of 50 μm, the urethane resin remaining after the easily soluble powder dissolves in water does not pass through the nonwoven fabric, but if the nonwoven fabric has a coarseness of 100 μm, the urethane resin The result of passing through the nonwoven fabric was obtained.

  The test samples of Test Examples 6 and 7 shown in Table 3 were prepared by mixing calcium sulfate having a solubility in water of 20 ° C. of about 0.3% and a urethane resin dissolved in an organic solvent, and drying the mixture. And granulated. In Comparative Example 3, a test sample was formed by drying a product obtained by dissolving calcium sulfate in an organic solvent, forming a test sample, and performing the above test. Since the test samples of Test Examples 6 and 7 and Comparative Example 3 are the same as those of Example 1 except for the powder, the description thereof will be omitted below.

表３に示すように、試験例６，７と比較例３とで粉末の溶解量を比較した場合、ウレタン樹脂を含有した試験例６，７とウレタン樹脂を含有しない比較例３とで、水に対する溶解量がほぼ同じになるという結果が得られた。これは、難溶解性と易溶解性との境界は、水に対する溶解度が０．３％付近であることを意味している。又、不織布において、不織布の目の粗さが５０μｍであれば、粉末が水に溶けて残存するウレタン樹脂は不織布を通過しないが、不織布の目の粗さが１００μｍになるとウレタン樹脂が不織布を通過してしまうという結果が得られた。

As shown in Table 3, when the dissolution amounts of the powders were compared in Test Examples 6 and 7 and Comparative Example 3, the water in Test Examples 6 and 7 containing a urethane resin and Comparative Example 3 containing no urethane resin The result that the amount of dissolution with respect to was almost the same was obtained. This means that the boundary between hardly soluble and easily soluble is that the solubility in water is around 0.3%. In addition, if the nonwoven fabric has a mesh roughness of 50 μm, the urethane resin remaining after the powder dissolves in water does not pass through the nonwoven fabric, but if the nonwoven fabric has a roughness of 100 μm, the urethane resin passes through the nonwoven fabric. As a result, it was obtained.

In addition, this embodiment can also be changed and embodied as follows.
・ The first additive should be used as a disinfectant that sterilizes bacteria that are easily generated from indoor condensate by air conditioners, and as a neutralizer for water that has been acidified by dissolving sulfides generated when burning kerosene. You can also. The first additive can also be used in a closed circulation cooling water system, a superheated circulation water system, a boiler water system, and the like.

  -In the 1st and 2nd additive, you may use the box provided with the filter in the upstream and downstream of water as an enclosure member in which a granule is enclosed. Alternatively, the enclosing member may be omitted and only the granules may be added directly to water.

Further, the technical idea that can be grasped from the embodiment will be described below.
-It is an additive added to water, and consists of granules containing a water-soluble substance and a urethane resin, and the granules are dried after mixing the water-soluble substance powder and the urethane resin in a solvent. An additive characterized by being obtained.

  A method for producing an additive, wherein the additive is added to water, the powder comprising a substance soluble in water and a urethane resin dissolved in a solvent being mixed and then dried.

Claims (7)

An additive added to water,
An additive comprising granules containing a water-soluble substance and a urethane resin. An additive added to water,
An additive obtained by mixing a powder of a substance soluble in water and a urethane resin in a solvent and then drying. An additive added to water,
Granules containing a water-soluble substance and a urethane resin;
An enclosing member made of a material that allows passage of a substance of 50 μm or less,
The additive is characterized in that the granule has a particle size exceeding 50 μm and is enclosed in the enclosing member.   The additive according to any one of claims 1 to 3, wherein the water-soluble substance is an easily soluble substance having a solubility in water of 20 ° C exceeding 1%.   The additive according to any one of claims 1 to 3, wherein the water-soluble substance is a hardly soluble substance having a solubility in water at 20 ° C of 1% or less.   The additive according to any one of claims 1 to 5, wherein a content of the urethane resin is set in a range of 1 to 20%.   6. The water-soluble substance that is added to the cooling water in an open circulating water system includes at least one selected from a corrosion inhibitor, an algicide, a disinfectant, and a scale inhibitor. Or the additive of 6.