JP2022001629A - Antibacterial coating agent of escalator handrail - Google Patents

Abstract

To solve the problem that handrails of escalators are provided on right and left sides so as to prevent overturn of a user, and are configured to move at the same speed as footsteps, many persons touch the handrails, sebum of hands is attached thereto and microorganisms such as bacteria live therein, therefore, if the handrails are subjected to continuous antibacterial treatment for suppressing living of the bacteria, persons can safely grip the handrails.SOLUTION: Copper fine powder is added, fixed and coated to a handrail coating agent, thereby can persist an antibacterial effect over a long period of time. Thereby, users can safely grip handrails, and it is useful for overturn prevention being an original purpose. In addition to reduction of a risk of a facility manager, courteous service can be also provided to a facility user. [Test result] An inspection result in a public inspection agency is as follows. (Staphylococcus aureus) The number of live bacteria immediately after inoculation is 24,700 pieces by average per 1 cm2 of a test piece, the number of live bacteria of an untreated piece after 24 hours is 59,700 pieces, and an antibacterial test piece is 0 piece. (Escherichia coli) The number of live bacteria immediately after inoculation is 24,000 pieces by average per 1 cm2 of a test piece, the number of live bacteria of an untreated piece after 24 hours is 2,633,000 pieces, and an antibacterial test piece is 183,700 pieces.

Description

Detailed description of the invention

The present invention relates to antibacterial solids. More specifically, the present invention relates to an antibacterial solid substance containing an antibacterial agent.

The handrail belts of the escalator are installed on the left and right for the purpose of preventing the user from falling by grasping them, and they are moving at the same speed as the step.

The handrail gets dirty with the user's sebum, surrounding dust, and the scattering of lubricating oil in the machine room.

Polishing and chemical cleaning techniques are probable and widespread for handrail cleaning.

After cleaning, a coating agent is applied to protect the surface and polish it so that a clean escalator handrail belt can be maintained.

Problems to be solved by the invention

The handrail belt becomes an environment where microorganisms grow due to the adhesion of organic substances such as sebum of the user.

Proliferation of harmful bacteria among microorganisms causes infectious diseases.

In the presence of microorganisms, viruses that host them parasitize and multiply.

When the virus propagates, it causes infections.

It prevents the increase of microorganisms by bactericidal or antibacterial action, or prevents infectious diseases by inactivation.

Bactericidal and antibacterial can be achieved by applying or spraying a disinfectant / antibacterial agent on the handrail belt of the escalator, but the antibacterial effect disappears when the agent dries.

If a disinfectant / antibacterial agent can be fixed to the handrail coating agent, the growth of microorganisms can be suppressed and an antibacterial effect can be expected for a long time.

The present invention provides a handrail belt for an escalator that has an antibacterial effect for a long time by adding a solid substance having an antibacterial effect for a long time to a handrail coating agent and applying it to the handrail. The purpose.

Means to solve problems

The present invention adds fine powders of metals with strong bactericidal activity, such as copper, silver, gold, lead, platinum, nickel, aluminum, tin, and zinc, to the resin of the polymer compound used in coating agents and paints. A coating that suppresses the growth of bacteria using the bactericidal power of metal is processed into handrails.

(Copper bactericidal power)

Reference 1

US Environmental Protection Agency (EPA): 2008 The US Environmental Protection Agency (EPA) is the first metal to certify that various copper alloys have bactericidal performance.

Reference 2

Excellent antibacterial power of copper (one company) Japan Copper Center

Reference 3

Lysis / antibacterial activity reaction in bacterial cell wall / cytoplasmic membrane / cytoplasm by copper (II) ion solution based on bacteriostatic / bactericidal action
Dr. Tsuneo Ishida

Reference 4

Antibacterial properties of silver and copper ions by Yoshinobu Matsumura, Department of Biological Engineering, Faculty of Engineering, Kansai University

The original purpose is achieved by selecting and using a metal that has established the strength of bactericidal power by metal ions and the safety to the human body.

(Copper safety)

Reference 1

Misunderstanding of patina: In August 1984, the Ministry of Health, Labor and Welfare (now the Ministry of Health, Labor and Welfare) admitted that the patina poisoning theory was wrong.
(One company) Japan Copper Center

Reference 2

Copper and Health: Copper is an essential metal for life support, growth and reproduction of all higher animals and plants.
(One company) Japan Copper and Brass Association

A metal that has both strong antibacterial properties and safety to the human body is added and fixed to the handrail coating agent to protect the escalator handrails that have antibacterial effects for a long time.

The best form for carrying out the invention

Fine copper powder (particle size 5 μm to 10 μm, thickness 0.3 μm to 0.5 μm) is added to an acrylic resin coating agent emulsified and dispersed in water in a volume ratio of 3% to 4%.

Clean the dirt on the escalator handrail with detergent and make sure it is dry.

If cleaning with a detergent is difficult, perform polishing cleaning with a polishing machine or the like to remove stains on the surface of the handrail.

After polishing and cleaning, the abrasive and the shavings of the handrail belt are removed, and a coating agent is applied.

Considering the surface roughness of the handrail in chemical cleaning and polishing cleaning, the coating agent should be applied twice.

After confirming that the first protective agent has dried and hardened, apply the second time.
The drying time suitable for the second application condition is 15 minutes when the relative humidity is 30% to 40% and 20 minutes when the relative humidity is 50% to 60%.

After the acrylic resin emulsified and dispersed in water, the water content dries, and the high molecular weight acrylic resin is fixed on the handrail surface as a solid substance.

The acrylic resin as a tangible solid that remains after the water dries is 18% to 20% of the emulsified and dispersed liquid, and the resin film formed is 2 μm to 3 μm.

Fine copper powder is fixed at a density of about 30% of the formed resin film, and the effect of suppressing the growth of bacteria is exhibited.

A resin for the purpose of making it difficult to get dirty and easy to remove even if it gets dirty is further applied on it, and this resin has a long-term antibacterial effect.

Fine copper powder (particle size 5 μm to 10 μm, thickness 0.3 μm to 0.5 μm) is added to the non-film type fluororesin in a volume ratio of 3% to 4%.

る。

To.

The antibacterial effect of the present invention was tested and inspected by a public inspection organization as follows.

Inspection organization: Hiroshima Prefectural Environmental Health Association Doctor of Medicine Supervised by Takaomi Wada

(Inspection outline: Membrane type acrylic resin)
The surface (rubber) of the handrail material of the escalator is peeled off to a thickness of 4 mm, cut into 50 mm (length) x 50 mm (width) to make a test sample, and the prepared bacterial solution is inoculated on the test piece, and a sterilization film (40 mm) is placed on the test piece. × 40 mm) was put on and brought into close contact.
After culturing this at 35 ± 1 ° C. and a relative humidity of 90% or more for 24 hours, the viable cell count was measured by the plutder plate culture method to evaluate the antibacterial effect.

The antibacterial effect was evaluated by the difference in the viable cell count test after 24 hours between the antibacterial test piece and the unprocessed test piece.

The test strains were Staphylococcus aureus and Escherichia coli based on JIS standards.

The test method is based on the antibacterial processed product-antibacterial test method / antibacterial effect (JISZ2802: 2010).

(Antibacterial effect)
The average number of viable bacteria immediately after inoculation with Staphylococcus aureus is ^{24,700 per cm 2} of the test piece, the average number of inhabitants of the unprocessed piece after 24 hours is 59,700, and the number of antibacterial test pieces is 0. It showed a strong sterilizing and antibacterial effect.

The average number of viable bacteria immediately after inoculation of E. coli was ^{24,000 per 1 cm 2} of the test piece, the average number of inhabitants of the unprocessed piece after 24 hours was 2,633,000, and the antibacterial test piece was 183,700. It showed an individual and became a strong antibacterial effect.

(Inspection outline: non-membrane type fluororesin)
Prepare a metal plate (thickness 2 mm, length 50 mm, width 50 mm), paint it on the surface so as not to be affected by metal, use it as a test sample, inoculate the prepared bacterial solution on the test piece, and sterilize the film on it. It was covered with (40 mm × 40 mm) and brought into close contact.
After culturing this at 35 ± 1 ° C. and a relative humidity of 90% or more for 24 hours, the viable cell count was measured by the plutder plate culture method to evaluate the antibacterial effect.

The antibacterial effect was evaluated by the difference in the viable cell count test after 24 hours between the antibacterial test piece and the unprocessed test piece.

The test strains were Staphylococcus aureus and Escherichia coli based on JIS standards.

The test method is based on the antibacterial processed product-antibacterial test method / antibacterial effect (JISZ2802: 2010).

(Antibacterial effect)
The average number of viable bacteria immediately after inoculation with Staphylococcus aureus is ^{21,000 per 1 cm 2} of test pieces, the average number of inhabitants of unprocessed pieces after 24 hours is 163,333, and the number of antibacterial test pieces is 0. It showed a strong sterilizing and antibacterial effect.

The average number of viable bacteria immediately after inoculation with E. coli was ^{10,500 per 1 cm 2} of the test piece, the average number of inhabitants of the unprocessed piece after 24 hours was 856,666, and the number of antibacterial test pieces was 0. It has a strong sterilizing and antibacterial effect.

The long-term antibacterial coating agent to which an antibacterial metal is added according to the present invention can also be produced in other metals such as silver, gold, lead, platinum, nickel, aluminum, tin and zinc.

The invention's effect

The coating agent for escalator handrails is made of synthetic resin and forms a strong film. Since it has abrasion resistance for several years, the antibacterial effect will continue for several years by applying the coating agent once.

Since the metal powder does not evaporate, it does not disappear naturally and the antibacterial effect lasts for a long time.

Since fine metal powder is mixed in the resin film, even if the surface is worn due to wear caused by handrail drive or wiping for daily cleaning, the metal powder in the next layer will appear on the surface and exert an antibacterial effect. The antibacterial effect lasts until all the resin film is worn away.

Since the service life of the handrail protective material in normal use is 3 years or more, the antibacterial effect will last for 3 years.

Since it is a metal that has strong bactericidal power and is safe for the human body, the safety of the user can be ensured.

Since the resin for antifouling treatment applied to the third layer is a non-membrane type, it wears faster than the film type resin and has a durability of 1 to 3 months.

If the handrail is clean, the user can grab it without hesitation, which is effective in preventing falls and allows the escalator to be used safely.

INDUSTRIAL APPLICABILITY According to the present invention, by always providing a handrail having an antibacterial effect without frequent disinfection, hygienic and safety such as prevention of a user's fall is promoted, and a better service can be provided to a facility manager. It can contribute to the sanitary environment and economic activities.

A fine powder of copper (particle size 5 μm to 10 μm, thickness 0.3 μm to 0.5 μm) is added to an acrylic resin coating agent emulsified and dispersed in water in a weight ratio of 0.3% to 0.6%.

Fine copper powder is fixed at a density of about 0.4% of the formed resin film, and the effect of suppressing bacterial growth is exhibited.

Fine copper powder (particle size 5 μm to 10 μm, thickness 0.3 μm to 0.5 μm) is added to the non-film type fluororesin in a weight ratio of 0.3% to 0.4%.

Claims (3)

A coating agent characterized by mixing fine metal powder with strong bactericidal activity with resin and applying it, and the metal powder appearing on the surface continues the antibacterial effect by ionization. A coating agent characterized by mixing fine copper powder with a resin and applying it, and the metal powder appearing on the surface continues the antibacterial effect by ionization. A coating agent for escalator handrails, which is characterized by mixing fine copper powder with resin and applying it, and the metal powder appearing on the surface continues the antibacterial effect by ionization.