JP4424913B2 - Antibacterial treatment method by thermal spraying of plastic products - Google Patents

Antibacterial treatment method by thermal spraying of plastic products Download PDF

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Publication number
JP4424913B2
JP4424913B2 JP2003031324A JP2003031324A JP4424913B2 JP 4424913 B2 JP4424913 B2 JP 4424913B2 JP 2003031324 A JP2003031324 A JP 2003031324A JP 2003031324 A JP2003031324 A JP 2003031324A JP 4424913 B2 JP4424913 B2 JP 4424913B2
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Japan
Prior art keywords
antibacterial
silver
plastic
particles
surface
Prior art date
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Expired - Fee Related
Application number
JP2003031324A
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Japanese (ja)
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JP2004238359A (en
Inventor
嘉種 成瀬
省吾 戸部
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株式会社ナルプラ
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Priority to JP2003031324A priority Critical patent/JP4424913B2/en
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an antibacterial treatment method by thermal spraying of plastic products.
[0002]
[Prior art]
There are a wide variety of plastic products that claim antibacterial properties, but most of them are metal particles that are easily ionized mixed in plastic materials as antibacterial agents, so the antibacterial agents are dispersed throughout the plastic products. . However, since antibacterial properties are the performance that only the surface is responsible for, the antibacterial performance is not sufficient when the antibacterial agent is dispersed throughout the plastic product, and the amount of the antibacterial agent is large, and it is expensive. There are drawbacks.
[0003]
On the other hand, in the inventions of JP-A-9-100205 and JP-A-6-246773, an antibacterial agent such as silver zeolite is coated in advance on the surface of a plastic molding die and transferred to the surface of the molded product. Proposing technology. However, it is unclear how much transfer to the surface of the plastic product is made, and there is a question as to how long the attached antibacterial agent can be kept without peeling.
[0004]
Furthermore, the invention of JP-A-9-124424 discloses a composition in which the particle surface is coated with a metal having antibacterial and antifungal properties by an electroless plating method. In this case, the composition can be used as a paint, and waste that is dispersed throughout the plastic product can be avoided. However, in the case of plastic products, it is rare to paint on the surface, so it seems unlikely to be effective except in special cases. Moreover, in this case, the retention of the antibacterial agent depends on the adhesion of the paint to the plastic surface, and if the coating is peeled off, the effect is lost.
[0005]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above points, and its object is to make it possible to fix an antibacterial agent on the surface of a plastic product with a necessary and sufficient amount and strength. Another object of the present invention is to provide a plastic product that ensures a certain amount of antibacterial performance with a certain amount of antibacterial agent.
[0006]
In order to solve the above-mentioned problems, the present invention is a method for antibacterial treatment of plastic products, in which particles of antibacterial agents are sparsely injected onto the surface of plastic products by spraying , and some of them are exposed from the surface. partially go out, in which took measures that some are to be put into a state as to communicate with the shallow or deep entered by external.
[0007]
There are several thermal spraying methods for fixing an antibacterial agent to the surface of a plastic product. For example, flame spraying using combustion gas as a heat source, high-speed flame spraying, explosion spraying methods, arc spraying using electricity as a heat source, and other various plasma spraying methods, laser spraying methods using laser light as a heat source, etc. There are various spraying methods such as a cold spray method and a blasting method such as shot peening as a method which does not require a heat source. In the present invention, almost all of these methods can be applied. However, because there are advantages and disadvantages, even if any spraying method can be applied, in the case of the present invention, the high-speed flame spraying method is optimal as a spraying method in which the flying speed of particles is extremely high and the temperature is low. The cold spray method is also suitable, but requires capital investment of tens of millions of yen or more. The room temperature blasting method is practical because it can be carried out at low cost.
[0008]
An antibacterial agent is a chemical substance that causes destruction or growth inhibition of microorganisms and super microorganisms. For example, silver, copper, zinc, and other metals are used. These metals are used alone or as a mixture with other substances, and in the present invention, in particular, in the form of silver or a mixed powder of silver and other substances.
[0009]
As a first method of fixing the antibacterial agent to the surface of the plastic product, there is a method of sparsely injecting the particles of the antibacterial agent onto the surface of the plastic product by a thermal spraying method . The method 1 of this state of the thermal spray-treated plastic surface is shown in Figure 1 if Shimese schematically. FIG. 1 is a microscopic image observed at a magnification of about 200 times. The particle diameter of silver composite particles obtained by granulating silver particles or a mixture of silver and another substance other than metal is 15 to 25 μm. In the present invention, “sparsely” means a distribution density of about 1 to 2 in 0.5 mm × 0.5 mm. However, the maximum particle size of 25 μm is the upper limit in terms of antibacterial performance, and even if it exceeds this, the economic efficiency is only lowered.
[0010]
The antimicrobial agent is used in two forms: silver particles or silver composite particles which are granulated powder of silver and another substance such as alumina. In the latter case, all materials that are mixed with silver and granulated can be applied to other materials, but metals that melt during spraying to form an alloy with silver cannot be used. Oxide ceramics are the main material. In the case of the above-mentioned silver and alumina, there is a sufficient antibacterial effect even at a ratio of 50 parts by weight of alumina to 1 part by weight of silver. Note that metals other than silver can be handled in substantially the same manner.
[0011]
Further, since the thermal spraying method is one of the film forming methods, the amount of the coating material (antibacterial agent particles) ejected in the thermal spraying apparatus is also an amount necessary for the film forming. However, in the usage pattern 1 according to the present invention, since a large amount of material is not required to form a film, the material supply device needs to be slightly modified. It is also necessary to set the moving speed of the spray gun early in order to minimize the time during which the plastic product surface is exposed to the heat of spraying. By keeping the above two points in mind, it is possible to use all thermal spraying devices for antibacterial treatment.
[0012]
A state in which silver or composite particles of silver and other substances are sparsely applied to the surface of a plastic product by the antibacterial treatment method of the present invention is as shown in FIG. That is, silver or a composite material particle 12 is sparsely injected into the surface 11 of the plastic product, and some of them are partly out of the surface, and some are shallow or deep and communicate with the outside. It becomes a state.
[0013]
As a second method of fixing the antibacterial agent to the surface of the plastic product, there is a method of mixing the antibacterial agent particles and the plastic powder and forming a film on the surface of the plastic product by a thermal spraying method . Also in the second embodiment of this, the antimicrobial agent particles can be used composite particles of silver particles or silver particles and other particles. The material of the plastic powder is preferably the same material as that of the plastic product for carrying out the method of the present invention or a material having good affinity.
[0014]
The second method for fixing the antibacterial agent was developed in order to apply the plastic spraying method to the method of the present invention. The plastic spraying method is originally intended to spray plastic on the surface of steel products and to form a film to give corrosion resistance. However, the present invention applies the plastic spraying method as a means to fix the antibacterial agent on the surface of plastic products. ing. The antibacterial agent is the above-mentioned silver particles or silver composite particles, and the particle size thereof may be in the range of 15 to 25 μm. For this particle size, the thickness of the plastic film 13 formed together with the particles 12 is set in the range of 20 to 30 μm. This is because most of the particles are exposed from the coating 13, and this state is schematically shown in FIG. The particle size of the silver particles or silver composite particles in the second fixing method is a relative value determined from the relationship with the thickness of the film.
[0015]
It should be noted that the “wetting property” between the silver particles or the silver composite particles and the plastic powder is very good. It is observed under a microscope that the plastic holds the silver particles or the silver composite particles firmly as shown in FIG. 3, and has been confirmed in terms of durability as described later.
[0016]
【Example】
1. Using silver composite particles made by mixing and granulating silver powder and alumina powder at a weight ratio of 20:80, the surface of a plastic product made of PP, ABS or the like is sprayed for about 1 second by a high-speed flame spraying method. It was driven at a density of about 400 per cm 2 .
[0017]
The obtained plastic product after antibacterial treatment showed almost no difference in appearance as compared with the product not subjected to the antibacterial treatment. That is, the gloss of the surface is not lost at all. In addition, when the antibacterial property was evaluated by a test method defined in JISZ2801, the antibacterial property of the plastic product after the treatment according to the present invention was not limited, and it was in the form of yellow grapes after 300 to 1000 washings with hot water. aureus, both E. coli inoculation subject ku become respectively 10 or less after regardless 18 hours elapsed even had 105 to 106 viable bacteria, the antibacterial activity value was 5.2 or more.
[0018]
2. Using silver composite particles of 20 μm in diameter obtained by mixing and granulating silver powder and alumina powder at a weight ratio of 1:50, thermal spraying was performed for 5 seconds to form a film with a film thickness of about 20 μm, and about 300 particles per 1 cm 2. The antibacterial agent was fixed at the density of
[0019]
The obtained antibacterial treated plastic product has the appearance of a film-formed plastic. Moreover, when the antibacterial evaluation was performed by the same method as in Example 1, the antibacterial effect equivalent to that in Example 1 was confirmed, and the antibacterial performance equivalent to that in Example 1 was exhibited even after washing with hot water. confirmed.
[0020]
【The invention's effect】
Since the present invention is constructed and operates as described above, a necessary and sufficient amount of antibacterial agent can be fixed to the surface of a plastic product by spraying, and as a result, a certain amount of antibacterial agent can be obtained. The agent ensures certain antibacterial performance, has no waste, and has the effect that the best effect can be expected at a minimum cost.
[Brief description of the drawings]
FIG. 1 is a schematic diagram based on a microphotograph at a magnification of about 200 times showing a distribution state of an antibacterial agent on the surface of a plastic product in which an antibacterial treatment method by thermal spraying of the plastic product of the present invention is performed.
FIG. 2 is a cross-sectional view schematically showing the state of an antibacterial agent fixed on the surface of a plastic product according to the invention of claim 2;
FIG. 3 is a cross-sectional view schematically showing the state of an antibacterial agent fixed on the surface of a plastic product according to the invention of claim 4;

Claims (2)

  1. A method for antibacterial treatment of plastic products, in which particles of antibacterial agents are sparsely injected onto the surface of a plastic product by thermal spraying , and some of them are partly out of the surface. antibacterial treatment method according to spraying of the plastic product characterized in that in a state that communication with shallower or deeper contains an external.
  2. 2. The antibacterial treatment method by thermal spraying of a plastic product according to claim 1, wherein the particles of the antibacterial agent are silver particles or silver composite particles obtained by granulating a mixture of silver and another substance other than metal .
JP2003031324A 2003-02-07 2003-02-07 Antibacterial treatment method by thermal spraying of plastic products Expired - Fee Related JP4424913B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003031324A JP4424913B2 (en) 2003-02-07 2003-02-07 Antibacterial treatment method by thermal spraying of plastic products

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2003031324A JP4424913B2 (en) 2003-02-07 2003-02-07 Antibacterial treatment method by thermal spraying of plastic products

Publications (2)

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JP2004238359A JP2004238359A (en) 2004-08-26
JP4424913B2 true JP4424913B2 (en) 2010-03-03

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Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BRPI0606390A2 (en) * 2005-01-10 2009-06-23 Xiom Corp thermally sensitive spray-applied powder compositions
US8753561B2 (en) * 2008-06-20 2014-06-17 Baxter International Inc. Methods for processing substrates comprising metallic nanoparticles
CN104395494A (en) * 2012-04-24 2015-03-04 艾尔尤斯科技有限公司 Coatings, coated surfaces, and methods for production thereof
CN107299312B (en) * 2017-05-24 2019-04-12 昆明理工大学 A method of enhancing hot-spraying coating antibacterial effect

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