JP2015013969A - Nano-order dispersion type antimicrobial coating and production method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an antimicrobial coating having long pot life, capable of forming film even in a practical film formation condition, and capable of obtaining a practical film in durability and light resistance.SOLUTION: An emulsion as a base is prepared and then is agitated and dispersed while performing evacuation. Thereby, a nano-order dispersion type antimicrobial coating having long pot life, excellent in film formation, capable of obtaining a film having high hardness, and capable of achieving an antibacterial effect in a long period, in which separation and sediment of the antimicrobial agent is suppressed, is provided. The production method of the nano-order dispersion type antimicrobial coating is also provided.

Description

  The present invention relates to an antibacterial paint, and more particularly to a nano-order dispersed antibacterial paint and a method for producing these nano-order dispersed antibacterial paints.

  There are many uses for paints, and the properties required there are also various. Among them, antibacterial paints are used in various ways in hospitals, nursing homes, health facilities, food processing factories, schools, public facilities, and home appliances.

  Among these various applications, improvement of antibacterial performance has been desired. However, in the antibacterial paint in which fine particles of metal or metal compound are dispersed, there is no practical antibacterial paint due to the problem of pot life due to separation and sedimentation of the antibacterial material and the problem of coating film strength.

JP 2008-56592 A JP 2008-308645 A JP 2009-1505 A JP 2006-29920 A JP 2011-94140 A JP 2012-255164 A JP 2012-224747 A

  The problem to be solved is to realize an antibacterial paint that has a long pot life, can be formed under practical coating film forming conditions, and can provide a practical coating film in terms of durability and light resistance. is there.

  In order to solve these problems, the authors have intensively studied the process of adjusting the paint when adding fine particles of metal or metal compounds to give the paint antibacterial properties, and after preparing the base emulsion, vacuum degassing By stirring and dispersing while performing antibacterial action, the separation and settling of the antibacterial agent is suppressed, the pot life is long, the film forming property is excellent, the coating film with high hardness is obtained, and the antibacterial effect is realized for a longer period of time. The inventors have found a method for producing an order-dispersed antibacterial paint and a nano-order dispersed antibacterial paint, and have completed the present invention.

  The nano-order dispersed antibacterial paint and the method for producing the nano-order dispersed antibacterial paint of the present invention have a long pot life, can be formed under practical coating film forming conditions, and are practical in terms of durability and light resistance. It has the advantage of providing antibacterial effects over a long period of time, and can be used in a wide variety of applications, contributing to the development of Japanese industries.

FIG. 1 is a flowchart of the steps of a method for producing a nano-order dispersed antibacterial paint according to the present invention. FIG. 2 is a conceptual view of a vacuum stirring and dispersing apparatus used for producing a nano-order dispersed antibacterial paint according to the present invention.

  The present invention provides a nano-order dispersed antibacterial paint and a method for producing a nano-order dispersed antibacterial paint, whereby stirring and dispersing are performed while degassing under reduced pressure, so that separation and settling of the antibacterial agent is suppressed and the pot life is increased. This is a nano-order dispersed antibacterial paint and a method for producing a nano-order dispersed antibacterial paint that have excellent film properties, high strength of the coating film, and realize antibacterial effect over a long period of time. The “paint” used in the present patent specification includes not only general application but also one used for floors such as so-called wax.

  In the method for producing a nano-order dispersive antibacterial paint according to the present invention, a step of constituting a paint by mixing and dispersing a paint composition containing a synthetic resin emulsion and / or resin and at least metal or metal compound fine particles. In this case, nano-order dispersion is performed by including a step of stirring and dispersing while performing degassing under reduced pressure. The step of adding the metal or metal compound fine particles may be before the step of stirring and dispersing while performing degassing under reduced pressure, or the step of adding and dispersing after the completion of the step.

  The antibacterial agent used in the nano-order dispersion type antibacterial paint according to the present invention uses fine particles of metal or metal compound. As fine particles of metal or metal compound, fine particles of platinum, silver, titanium, silver oxide, titanium oxide, etc. are preferably used. Among these, it is particularly effective to use platinum fine particles having an average particle diameter of 1 to 10 nm. These antibacterial agents may be subjected to a treatment such as colloidalization before being added to the nano-order dispersed antibacterial paint.

  The coating composition further comprises a thickener, a dispersant, a wetting agent, an antifoaming agent, an antifoaming agent, a film forming aid, an antifreezing agent, a freezing stabilizer, an antiseptic agent, an antisettling agent, and an antiadhesive agent. 1 type, or 2 or more types of adjuvants chosen from the group which consists of drying preparation agents, or temperature control agents, such as a heat conversion agent, a heat insulating material, and a heat shielding agent, may be included.

  Furthermore, the nano-order dispersed antibacterial paint according to the present invention may include a pigment, a phosphorescent pigment, a fluorescent pigment, or a retroreflective material. Each pigment may be coated with silica or the like.

In the method for producing a nano-order dispersion type antibacterial paint according to the present invention, nano-order dispersion is carried out by stirring and dispersing the coating composition while performing degassing under reduced pressure.
FIG. 1 is a flowchart of the steps of a method for producing a nano-order dispersed antibacterial phosphorescent paint according to the present invention. First, a coating composition containing a synthetic resin emulsion and / or resin and an antibacterial agent comprising at least metal or metal compound fine particles, 100 parts by weight of the synthetic resin emulsion and / or resin, and 0.1% of the antibacterial agent A coating composition raw material is prepared by mixing 50 parts by weight to 50 parts by weight, water and / or a solvent in the range of 50 parts by weight to 200 parts by weight. Here, the coating composition raw material further includes a thickener, a dispersant, a wetting agent, an antifoaming agent, an antifoaming agent, a film forming aid, an antifreezing agent, a freezing stabilizer, an antiseptic, an antisettling agent, and an anti-adhesion agent. One or two or more auxiliary agents selected from the group consisting of an agent, a drying preparation agent, or a temperature suppressing agent such as a heat conversion agent, a heat insulating material, and a heat shielding agent may be included. Furthermore, the nano-order dispersed antibacterial paint according to the present invention may include a pigment, a phosphorescent pigment, a fluorescent pigment, or a retroreflective material. Each pigment may be coated with silica or the like.

  FIG. 2 is a conceptual diagram of a vacuum stirring and dispersing apparatus used for producing a nano-order dispersed antibacterial paint according to the present invention. The vacuum stirring and dispersing apparatus used for the production of the nano-order dispersion type antibacterial paint according to the present invention has a flange so that the container part and the lid part can be opened and closed, and after the coating composition raw material is put into the container part The container body and the lid part are tightened by closely contacting the flange so that the inside of the container can be decompressed.

  After the raw material of the coating composition is put into the container part and the flange is tightened, the vacuum pump is operated to depressurize the container body, and the propeller is rotated to disperse the mixture. In the method for producing a nano-order dispersion type antibacterial phosphorescent paint according to the present invention, it is desirable to adjust the pressure in the container during the stirring and dispersing step to 1 Pa to 50000 Pa. The pressure in the container body is more preferably adjusted to 1 Pa to 5000 Pa, and more preferably adjusted to 1 Pa to 500 Pa. The step of stirring and dispersing by rotating the propeller installed in the container and the step of reducing pressure are alternately repeated or simultaneously performed.

  It is effective for stirring and dispersing that the propeller installed in the container has a shape in which emulsion particles are cut and dispersed. Moreover, it is desirable to maintain the rotation speed of the propeller during the stirring and dispersing step in a range of 200 rpm to 5000 rpm. The decompression and / or stirring / dispersing step is desirably performed in a total range of 5 minutes to 24 hours. The decompression and / or stirring dispersion step is more preferably performed in a range of 30 minutes to 12 hours in total, more preferably in a range of 1 hour to 6 hours, and more preferably in a range of 2 hours to 4 hours. More desirable to do.

  A particularly preferred nanonization step is to alternately repeat the pressure reduction step and the stirring dispersion step. Of course, it is also effective to reduce the pressure after adjusting the pressure during the stirring and dispersing step. In this case, it is more effective to repeat the steps in the order of reduced pressure stirring dispersion at low speed rotation and reduced pressure stirring dispersion at high speed rotation. In the case of alternately performing the reduced pressure stirring dispersion at the low speed and the high speed rotation as described above, the steps of the reduced pressure stirring dispersion at the low speed rotation within 1 minute to 30 minutes and the reduced pressure stirring dispersion at the high speed rotation within 5 minutes to 3 hours. It is more desirable to repeat as one set.

  The nano-order dispersion type antibacterial coating material according to the present invention that has undergone the stirring and dispersing step under reduced pressure described above has a long pot life, excellent film forming characteristics, and a high hardness coating film because the separation and settling of the antibacterial agent is suppressed. Therefore, the nano-order dispersion type antibacterial coating material that realizes the antibacterial effect for a long time was realized.

  Hereinafter, the nano-order dispersed antibacterial paint and the method for producing the nano-order dispersed antibacterial paint according to the present invention will be described in detail based on examples.

  In this example, a nano-order dispersed antibacterial phosphorescent paint was produced. Here, an example of a method for producing a nano-order dispersed antibacterial phosphorescent paint according to the present invention will be described, and at the same time, a vacuum stirring and dispersing apparatus used for producing a nano-order dispersed antibacterial paint will be described.

  In this example, an acrylic acid ester copolymer emulsion was dispersed in water as a raw material emulsion for a nano-order dispersion type antibacterial phosphorescent paint. In addition, as raw material emulsion used for this invention, it is not limited to the material which concerns on a present Example, Various synthetic resin emulsions and / or water-soluble resin can be used suitably. Furthermore, an oil-based paint using a solvent or the like instead of water may be used.

  In this example, 110 parts by weight of water was added to 100 parts by weight of the acrylate copolymer emulsion, and 2.5 parts by weight of an antifoaming agent, 0.4 parts by weight of a wetting agent and an antifoaming agent, 2.5 parts by weight of the dry preparation agent was added and stirred. Here, depending on the properties of the paint required as additives, the coating composition raw materials further include thickeners, dispersants, wetting agents, antifoaming agents, antifoaming agents, film forming aids, antifreeze agents, and freeze stability. 1 type or 2 types or more of auxiliary agents selected from the group consisting of agents, preservatives, anti-settling agents, anti-adhesion agents, drying preparation agents, or temperature inhibitors such as heat conversion agents, heat insulating materials, and heat shielding agents May be included.

  An antibacterial agent was further added to the emulsion and stirred to obtain an antibacterial coating material, which was further nano-sized by a vacuum stirring and dispersing step to obtain a nano-order dispersed antibacterial coating. In this example, 5 parts by weight of platinum fine particles having an average particle size of 1 to 10 nm as an antibacterial agent were added to 100 parts by weight of the emulsion and stirred to obtain a nano-order dispersed antibacterial paint. The invention is not limited to these materials and their blending ratios.

  As the antibacterial agent used in the present invention, fine particles of platinum, silver, titanium, silver oxide, titanium oxide, etc. are suitably used as the fine particles of metal or metal compound. Among these, it is particularly effective to use platinum fine particles having an average particle diameter of 1 to 10 nm. Further, these antibacterial agents may be subjected to a treatment such as colloidalization before being added to the nano-order dispersed aqueous antibacterial coating. Also, the blending ratio can be arbitrarily set with respect to the aqueous emulsion. Here, the present invention may be an oil-based paint using a solvent or the like instead of water.

  After sufficiently stirring and mixing the above mixed composition, the emulsion coating composition is put into a vacuum stirring and dispersing apparatus used for the production of a nano-order dispersion type antibacterial coating and subjected to vacuum stirring and dispersing, whereby nano according to the present invention is obtained. An order-dispersed antibacterial paint was obtained. Here, the present invention may be an oil-based paint using a solvent or the like instead of water.

  FIG. 2 shows a conceptual diagram of a vacuum stirring and dispersing apparatus used for producing the nano-order dispersion type antibacterial phosphorescent paint according to the present invention. The vacuum stirring and dispersing apparatus used for the production of the nano-order dispersion type antibacterial paint according to the present invention has a flange so that the container part and the lid part can be opened and closed, and after the coating composition raw material is put into the container part The container body and the lid part are tightened by closely contacting the flange so that the inside of the container can be decompressed.

  After the coating composition raw material was put into the container part and the flange was tightened, the inside of the container was depressurized by operating a vacuum pump, and the propeller was rotated to perform stirring and dispersion. In the method for producing a nano-order dispersion type antibacterial paint according to the present invention, it is desirable to adjust the pressure inside the container during the stirring and dispersing step to 1 Pa to 50000 Pa. The pressure in the container body is more preferably adjusted to 1 Pa to 5000 Pa, and more preferably adjusted to 1 Pa to 500 Pa. In this example, the pressure in the container fluctuated depending on the amount of air remaining in the emulsion during the process, but the degree of foaming of the emulsion in the container was observed as appropriate, and the degree of pressure reduction was adjusted with a valve.

  It is effective for stirring and dispersing that the propeller installed in the container has a shape in which emulsion particles are cut and dispersed. Moreover, it is desirable to maintain the rotation speed of the propeller during the stirring and dispersing step in a range of 200 rpm to 5000 rpm. The decompression and / or stirring / dispersing step is desirably performed in a total range of 5 minutes to 24 hours. The decompression and / or stirring dispersion step is more preferably performed in a range of 30 minutes to 12 hours in total, more preferably in a range of 1 hour to 6 hours, and more preferably in a range of 2 hours to 4 hours. More desirable to do.

  The step of stirring and dispersing by rotating the propeller installed in the container and the step of reducing pressure are alternately repeated or simultaneously performed. A particularly preferred nanonization step is to alternately repeat the pressure reduction step and the stirring dispersion step. In this example, first, after sealing the flange, pressure reduction was performed for 10 minutes while rotating the propeller at a low speed of 1000 rpm or less, and then the rotation speed of the propeller was increased to 1500 rpm or more for 30 minutes under reduced pressure stirring dispersion. Thereafter, the pressure was reduced again for 10 minutes at a low speed rotation, and further, stirring and dispersing under reduced pressure for 1 hour was performed at a high speed rotation. Finally, the mixture was stirred and dispersed under reduced pressure for 10 minutes at a low speed to obtain a nano-order dispersion type antibacterial phosphorescent paint.

  By changing the emulsion base used in Example 1 to a wax ester, a nano-order dispersed antibacterial paint usable as a wax was obtained. In this example, titanium oxide fine particles were used as an antibacterial agent. A nano-order dispersed antibacterial wax was obtained using the same apparatus as in Example 1 and in the same process.

  Here, the nano-order dispersion type antibacterial paint according to the present invention was an antibacterial paint having a low sedimentation rate and a long pot life by setting the emulsion diameter to 10 μm or less by stirring and dispersing under the above conditions. Furthermore, the emulsion diameter is preferably 5 μm or less, more preferably 1 μm or less, and further preferably 0.5 μm or less.

  In general antibacterial paints and the like, the emulsion containing an antibacterial agent has a large diameter, so that it easily settles, and precipitates are formed in storage for several days to several weeks, resulting in deterioration of film formability. However, since the nano-order dispersion type antibacterial paint according to the present invention is dispersed to the nano order where the diameter of the emulsion containing the antibacterial agent is very small, the sedimentation rate is slow, and the nano-order dispersion type antibacterial paint is sufficiently formed even after a storage period of one year or more. It was a paint with good film properties. Here, the present invention may be an oil-based paint using a solvent or the like instead of water.

  In addition, the nano-order dispersed antibacterial paint according to the present invention has a low environmental load and can be used for various applications as an extremely ecological antibacterial paint. Furthermore, since the nano-order dispersion type antibacterial paint according to the present invention performs nano-order dispersion, the antibacterial action is maintained for a long period of time.

  In addition, the nano-order dispersion type antibacterial paint according to the present invention has a nano-order dispersion, so that the film formability is good, and a good coating film can be obtained by various film forming methods such as coating and spraying. I can do it. Moreover, the characteristics such as the adhesion strength of the coating film, the strength of the coating film itself, the weather resistance, and the light resistance were also good. Furthermore, it is easy to obtain a thick film by overcoating, and it has characteristics that can be used for various applications.

  The present invention provides a nano-order dispersive antibacterial paint and a method for producing a nano-order dispersive antibacterial paint, which has a long pot life, can be formed under practical coating film forming conditions, and is durable and light resistant. There is an advantage that a practical coating film can be obtained and an antibacterial effect can be realized over a long period of time. Antibacterial paints can be used in a wide variety of applications such as hospitals, nursing homes, health facilities, food processing factories, schools, public facilities, and home appliances, and contribute to the development of Japanese industries.

DESCRIPTION OF SYMBOLS 1 Container body part 2 Propeller for stirring dispersion 3 High-speed rotating shaft 4 Low-speed rotating shaft 5 Vacuum pump 6 Operation panel

Claims (32)

  A nano-order dispersion type antibacterial paint characterized in that the emulsion diameter is adjusted to 10 μm or less by stirring and dispersing while performing degassing under reduced pressure.   In the antibacterial paint, the antibacterial paint contains fine particles of a metal or a metal compound as an antibacterial agent, and the emulsion diameter is adjusted to 10 μm or less by stirring and dispersing while performing degassing under reduced pressure. The nano-order dispersion type antibacterial paint according to 1.   In the antibacterial paint, the antibacterial agent contains one or more of platinum, silver, titanium, silver oxide or titanium oxide fine particles, and the emulsion diameter is reduced to 10 μm or less by stirring and dispersing while performing degassing under reduced pressure. The nano-order dispersion type antibacterial paint according to claim 1, which is prepared.   In the antibacterial paint, the antibacterial agent is platinum fine particles having an average particle diameter of 1 to 10 nm, and the emulsion diameter is adjusted to 10 μm or less by stirring and dispersing while degassing under reduced pressure. Item 2. The nano-order dispersed antibacterial paint according to item 1.   2. The nano-order dispersion type according to claim 1, wherein the antibacterial paint further contains a pigment, and the emulsion diameter is adjusted to 10 [mu] m or less by stirring and dispersing while performing degassing under reduced pressure. Antibacterial paint.   6. The nano-order dispersed antibacterial paint according to claim 1, wherein the emulsion diameter is adjusted to 5 μm or less.   7. The nano-order dispersed antibacterial paint according to claim 1, wherein the emulsion diameter is adjusted to 1 μm or less.   8. The nano-order dispersed antibacterial paint according to claim 1, wherein the emulsion diameter is adjusted to 0.5 μm or less.   9. The nano-order dispersed antibacterial paint according to claim 1, wherein the pressure of the vacuum degassing is 1 Pa to 50000 Pa.   The nano-order dispersed antibacterial paint according to claim 9, wherein the pressure of the vacuum degassing is 1 Pa to 5000 Pa.   The nano-order dispersed antibacterial paint according to claim 10, wherein the pressure of the vacuum degassing is 1 Pa to 500 Pa.   A nano-order dispersion type antibacterial paint comprising 100 parts by weight of a synthetic resin emulsion and / or resin as a raw material for a paint composition, 0.1 to 50 parts by weight of an antibacterial agent, and 50 to 200 parts by weight of water The nano-order dispersed antibacterial paint according to any one of claims 1 to 11, wherein a coating composition raw material emulsion mixed in a range is used.   The coating composition further includes thickeners, dispersants, wetting agents, antifoaming agents, antifoaming agents, film forming aids, antifreezing agents, freezing stabilizers, preservatives, antisettling agents, antiadhesives, and dry-control agents. The composition comprises one or more auxiliary agents selected from the group consisting of a preparation or a temperature inhibitor such as a heat conversion agent, a heat insulating material and a heat shielding agent. The nano-order dispersed antibacterial paint as described.   16. The nano-order dispersion type antibacterial paint according to claim 1, wherein the stirring dispersion is performed by reducing the pressure in the container body and stirring with a propeller.   The nano-order dispersive antibacterial coating material according to claim 14, wherein the rotation speed of the propeller during the stirring and dispersing step is in a range of 200 rpm to 5000 rpm.   16. The nano-order dispersed antibacterial paint according to claim 1, which can be used as a wax by changing the resin used in the emulsion to a wax ester.   In the method for producing an antibacterial paint, a method for producing a nano-order dispersive antibacterial paint characterized in that the emulsion diameter is adjusted to 10 μm or less by stirring and dispersing while performing degassing under reduced pressure.   In the method for producing an antibacterial paint, the antibacterial paint contains fine particles of a metal or a metal compound as an antibacterial agent, and the emulsion diameter is adjusted to 10 μm or less by stirring and dispersing while performing degassing under reduced pressure. A method for producing a nano-order dispersed antibacterial paint according to claim 17.   In the method for producing an antibacterial paint, the antibacterial agent contains one or more fine particles of platinum, silver, titanium, silver oxide or titanium oxide, and the emulsion diameter is reduced by stirring and dispersing while performing vacuum degassing. The method for producing a nano-order dispersed antibacterial paint according to claim 17, wherein the nano-order dispersed antibacterial paint is prepared to have a thickness of 10 µm or less.   In the method for producing an antibacterial paint, the antibacterial agent is platinum fine particles having an average particle diameter of 1 to 10 nm, and the emulsion diameter is adjusted to 10 μm or less by stirring and dispersing while performing vacuum degassing. The method for producing a nano-order dispersed antibacterial paint according to claim 17.   18. The method according to claim 17, wherein the antibacterial paint further contains a pigment, and the emulsion diameter is adjusted to 10 μm or less by stirring and dispersing while performing degassing under reduced pressure. Manufacturing method of order-dispersed antibacterial paint.   The method for producing a nano-order dispersed antibacterial paint according to any one of claims 17 to 21, wherein the emulsion diameter is adjusted to 5 µm or less.   23. The method for producing a nano-order dispersed antibacterial paint according to claim 17, wherein the emulsion diameter is adjusted to 1 μm or less.   24. The method for producing a nano-order dispersed antibacterial paint according to claim 17, wherein the emulsion diameter is adjusted to 0.5 [mu] m or less.   25. The method for producing a nano-order dispersed antibacterial paint according to claim 17, wherein the pressure of the vacuum degassing is 1 Pa to 50000 Pa.   The method for producing a nano-order dispersed antibacterial paint according to claim 25, wherein the pressure of the vacuum degassing is 1 Pa to 5000 Pa.   27. The method for producing a nano-order dispersed antibacterial paint according to claim 26, wherein the pressure of the vacuum degassing is 1 Pa to 500 Pa.   A method for producing a nano-order dispersion type antibacterial paint, comprising 100 parts by weight of a synthetic resin emulsion and / or resin as a raw material for a paint composition, 0.1 to 50 parts by weight of an antibacterial agent, and 50 of water and / or solvent. 28. The method for producing a nano-order dispersed antibacterial coating material according to claim 17 or 27, wherein the coating composition raw material emulsion mixed in the range of parts by weight to 200 parts by weight is used.   The coating composition further includes thickeners, dispersants, wetting agents, antifoaming agents, antifoaming agents, film forming aids, antifreezing agents, freezing stabilizers, preservatives, antisettling agents, antiadhesives, and dry-control agents. 29. The composition according to claim 17, comprising one or more adjuvants selected from the group consisting of a preparation, or a temperature inhibitor such as a heat conversion agent, a heat insulating material, and a heat shielding agent. A method for producing the nano-order dispersed antibacterial paint as described.   30. The method for producing a nano-order dispersion type antibacterial paint according to claim 17, wherein the stirring and dispersing is performed by reducing the pressure in the container body and stirring with a propeller.   The method for producing a nano-order dispersive antibacterial paint according to claim 30, wherein the rotation speed of the propeller during the stirring and dispersing step is in the range of 200 rpm to 5000 rpm.   32. The method for producing a nano-order dispersed antibacterial paint according to claim 17, wherein the resin used for the emulsion can be used as a wax by changing to a wax ester.

Images