JP2002338898A - Coating material for handrail belt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating material for a handrail belt which has no dangerousness such as flammability and inhalation noxiousness, can form a film in a short period of time, excels in durability against friction and, simultaneously, can form an easily removable coating film, and furthermore does not require specific equipment in coating on a handrail. SOLUTION: The coating material comprises, as the major component, an aqueous resin having a breaking strength of >=20 N/mm<2> and, at the same time, and a breaking extension of >=100% on forming a film of the compound and, in addition, a solid content of the compound of >=15%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an escalator,
The present invention relates to a handrail belt coating agent for protecting the surface of a handrail belt such as a moving sidewalk and maintaining an aesthetic appearance.

[0002]

2. Description of the Related Art Escalators and moving sidewalks installed in many places such as department stores, home centers, public facilities and station buildings are provided with handrail belts for users to grasp from the viewpoint of safety. However, these handrail belts are easily soiled, and if the soiling is remarkable, there is a concern that the number of users trying to grasp the handrail from a sanitary point of view is reduced, and the function of the bent handrail belt is not exhibited.

[0003] Therefore, in order to protect the surface of the handrail belt and maintain its appearance, a coating agent is applied to the handrail belt to form a protective film on the surface of the handrail belt.
Periodically or if the protective film formed on the surface of the handrail belt becomes contaminated, the protective film formed on the surface of the handrail belt is removed, and a new coating agent is applied to form a protective film. Such maintenance is being performed.

[0004] Such a handrail belt coating agent is, for example, one containing a room temperature-curable silicone resin and an organic solvent as disclosed in JP-A-60-190483, and Japanese Patent Publication No. 60-12109. A solvent-type one containing a moisture-curable one-component polyurethane as a main component as shown in the following, an acrylic resin emulsion and a urethane-based resin emulsion as shown in JP-A-11-5924, or Those having both as main components have been proposed. Also, JP-A-8-2
Japanese Patent No. 77083 discloses a method for coating a handrail belt using an ultraviolet-curable paint.
No. 335 proposes a method for coating a handrail belt using a photocurable resin.

[0005]

However, organic resins such as a room temperature-curable silicone resin disclosed in JP-A-60-190483 and a moisture-curable one-pack polyurethane disclosed in JP-B-60-12109 are disclosed. Solvent-type paint
There are flammability and suction harmfulness, so it is not preferable in terms of safety, and the latter moisture-curable one-component polyurethane takes too much time to develop the coating film strength, especially from the last train to the first generator There is a problem that it is difficult to use it for a handrail belt such as an escalator in a station building that can be stopped only for a short time. Furthermore, in the case of a coating agent for a handrail belt using an organic solvent type coating, when it is intended to remove dirt attached to the coating film surface, it is necessary to remove the dirt together with the coating film by polishing the coating film. There is also a problem that the work efficiency of the removing operation is deteriorated and dust is generated.

In the case of escalators and moving sidewalks,
The handrail belt is driven by a feeding action by friction of a feeding roller.
Since the compounding system disclosed in JP-A No. 4 is very generally known as a polish composition for floors, the coating agent formed with such a composition has sufficient durability against the friction of the feed roller. Rather, it requires buffing work to increase the hardness of the surface of the coating in order to obtain durability, which takes too much time, especially also for a short time from the last train to the first generator car There is a problem that it is difficult to use a handrail belt for an escalator or the like in a station building that cannot perform such operations. Further, in a coating method using an ultraviolet curable resin disclosed in JP-A-8-277083 or a photocurable resin disclosed in JP-A-2001-19335, coating for obtaining durability of the coating film is performed. Special equipment was required for the curing of the agent.

It is an object of the present invention to form a coating film which has no danger such as flammability and harmfulness of suction, can be formed in a short time, has excellent durability and can be easily removed, and further has a handrail belt. It is an object of the present invention to provide a handrail belt coating agent that does not require special equipment when applying it to a handrail belt.

[0008]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, have found that a water-based resin having a breaking strength and a breaking elongation at the time of film formation exceeding a specific value is used. The present inventors have found that a film can be formed in a short time in a short time, and a coating film excellent in durability and easily removable can be formed, and the present invention has been completed.

That is, the coating agent for a handrail belt according to the present invention has a breaking strength at the time of film formation of a compound of 20 N / mm.
It is characterized by containing an aqueous resin having a breaking elongation of ² or more and a breaking elongation of 100% or more as a main component.

When a water-based resin is used as the main component of the handrail belt coating agent, unlike a solvent-type handrail belt coating agent, there is no flammability or suction harmfulness, and it dries in a short time. In order to form a coating film without changing the surface of the belt material, when removing the coating film during maintenance work performed when the coating film is contaminated, remove the coating film without polishing the handrail belt This makes it easy to remove the coating film and does not damage the handrail belt.

In addition, the water-based resin composition has a breaking strength at the time of film formation of 20 N / mm ² or more and a breaking elongation of 10
When it is 0% or more, it exhibits durability against abrasion caused by the feed roller, and does not require special work or special equipment for obtaining durability. The water-based resin composition has a breaking strength at the time of film formation of 30 N / mm ² or more and a breaking elongation of 2
The content is more preferably at least 00%, and exhibits more practical durability against abrasion by the feed roller.

Further, the solid content of the blended system of the aqueous resin is 1%.
It is preferably at least 5%, more preferably at least 20%. If the solid content of the water-based resin is less than 15%, the film thickness at the time of application is thin, and it must be applied several times in order to obtain sufficient film strength. Resulting in.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The coating agent for a handrail belt according to the present invention has a breaking strength at the time of film formation of a compound of 20 N / m.
The main component is an aqueous resin having a m ² or more and a breaking elongation of 100% or more.

The composition has a breaking strength of 20 N /
mm ² or more and the elongation at break is 100% or more, it exhibits durability against abrasion by the feed roller,
No special work or special equipment is required for durability. The composition has a breaking strength of 30 N / mm ² during film formation.
More preferably, the elongation at break is at least 200%, and more practical durability against abrasion by the feed roller is exhibited.

The water-based resin includes urethane, acrylic, nylon, polyester, and epoxy resins, and has a breaking strength of 20 N / mm ² or more at the time of film formation and a breaking elongation of 100% or more. If it is, it may be a simple substance, a mixed system, or a crosslinked product of each.

Examples of the urethane-based water-based resin include water-soluble, colloidal dispersion, and emulsion of a urethane resin formed from an aromatic, aliphatic, or alicyclic isocyanate and a polyester, polycarbonate, or polyether-based polyol. Can be

Examples of the acrylic aqueous resin include acrylates such as methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, n-butyl acrylate, isobutyl acrylate and 2-ethylhexyl acrylate. One or more and / or methyl methacrylate, ethyl methacrylate, n-propyl methacrylate, isopropyl methacrylate,
One or more methacrylates such as n-butyl methacrylate, isobutyl methacrylate, 2-ethylhexyl methacrylate, stearyl methacrylate, lauryl methacrylate, and styrene, acrylonitrile, methacrylonitrile, vinyl chloride, vinylidene chloride , Vinyl acetate, methyl vinyl ether, n-propyl vinyl ether, isopropyl vinyl ether, n-butyl vinyl ether, vinyl ether such as isobutyl vinyl ether, acrylic acid, methacrylic acid, itaconic acid, citraconic acid, carboxyl group-containing vinyl monomer such as crotonic acid, β-hydroxyethyl acrylate,
hydroxyl-containing vinyl monomers such as β-hydroxyethyl methacrylate, β-hydroxypropyl acrylate, β-hydroxypropyl methacrylate, allyl alcohol, N-methylol acrylamide, N-methylol methacrylamide, glycidyl acrylate, glycidyl methacrylate, glycidyl allyl ether, etc. A copolymer with one or more vinyl monomers copolymerizable with the acrylate and / or methacrylate such as an epoxy group-containing vinyl monomer,
The copolymer is usually provided in an emulsion of 30 to 60% by weight.

Examples of the nylon-based water-based resin include AQ nylon (manufactured by Toray Industries, Inc.) using a modified polyamide having a hydrophilic group. Examples of the polyester-based aqueous resin include linear thermoplastic saturated polyester Byron (manufactured by Toyobo Co., Ltd.). Examples of the epoxy-based water-based resin include a self-emulsifying type epicron (manufactured by Dainippon Ink and Chemicals, Inc.),
Denacast (manufactured by Nagase Kasei Kogyo Co., Ltd.) and the like.

The coating agent for a handrail belt according to the present embodiment containing an aqueous resin as a main component as described above includes a film-forming aid, a plasticizer, an antifoaming agent, a preservative, an ultraviolet absorber, a crosslinking agent, A leveling agent is appropriately added as needed.

Here, as the film-forming auxiliary, for example, methyl cellosolve, ethyl cellosolve, butyl cellosolve, methyl carbitol, ethyl carbitol, butyl carbitol, dibutyl carbitol, methyl cellosolve acetate, ethyl cellosolve acetate, butyl cellosolve acetate, Methyl carbitol acetate,
Ethyl carbitol acetate, butyl carbitol acetate, benzyl alcohol, benzyl acetate,
Petroleum hydrocarbons, Texanol, etc. can be used.

As the plasticizer, phthalic acid esters such as dibutyl phthalate and dioctyl phthalate, and alkyl allyl phosphates such as tributoxyethyl phosphate can be used.

As the above-mentioned cross-linking agent, a water-soluble resin cross-linking agent obtained by adding a hydrophilic segment to a melamine, a multifunctional aziridine, or a polycarbodiimide-based resin containing a carbodiimide group is used for an urethane-based aqueous resin. For the aqueous resin, for example, an alkali aqueous solution of a metal such as a zinc ammonium carbonate solution can be used, and for the epoxy aqueous resin, a polyamide resin, a modified polyamine, or an emulsion thereof can be used.

Examples of the antifoaming agent include silica silicone, silicone, metal soap, fatty acid amide, and the like.
Fatty acid esters, polyethers, polyglycols,
Organic phosphoric acid type, higher alcohol type, sulfonated fatty acid type, oil-soluble polymer and the like can be used.

Examples of the ultraviolet absorber include 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-methoxybenzophenone 5-sulfonic acid, and 2-hydroxy-4-n-octoxy. Benzophenone, 2-hydroxy-4-n-dodecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2,2′-dihydroxy-4-methoxybenzophenone, 2,2 ′, 4,4′-
Benzophenones such as tetrahydroxybenzophenone and 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2- (2'-hydroxy-5'-methylphenyl) -benzotriazole, 2- (2'-hydroxy-3 ', 5'-di-t-butylphenyl) -5-chloro-benzotriazole, 2- (2'-hydroxy-
3'-t-butyl-5'-methylphenyl) -5-chloro-benzotriazole, 2- (2'-hydroxy-
3 ', 5'-di-t-amylphenyl) -benzotriazole, 2- (2'-hydroxy-3', 5'-di-t
-Butylphenyl) -benzotriazole, 2- (2 ′
-Hydroxy-5'-t-butylphenyl) -benzotriazole, 2- (2'-hydroxy-5'-t-octylphenyl) -benzotriazole, 2,4-di-t
-Butylphenyl-3 ', 5'-di-t-butyl4'-
Benzotriazoles such as hydroxybenzoate and reactive ultraviolet absorbers having a methacryloyl group introduced into the benzotriazole skeleton can be used.

As the leveling agent, a cationic, anionic or nonionic surfactant can be used as an additive for improving the wettability to the substrate surface.

The solid content of the aqueous resin is preferably 15% or more, more preferably 20% or more. 15% solids in water-based resin
If it is less than this, the film thickness at the time of application is small, and it is necessary to apply it several times in order to obtain sufficient coating film strength, and it takes a long time for the operation.

[0027]

EXAMPLES The characteristics of the coating agent for a handrail belt according to the present invention will be illustrated with reference to examples and comparative examples of the present invention. However, the present invention is not limited at all by these Examples and Comparative Examples.

Examples 1 to 5 and Comparative Examples 1 to 4 Coating agents for handrail belts having compositions and breaking strengths / elongations at break shown in Tables 1 (Examples) and 2 (Comparative Examples) were prepared, and durability against abrasion was adjusted. The properties and stain resistance were evaluated. In the table, figures other than the figures for the breaking strength, breaking elongation, and solid content of the compound show the weight percentage of the components of the coating agent for the handrail belt.

[0029]

[Table 1]

[Table 2] Note 1 Neorez R-960 (resin solid component 33%)
* 2 Neorez R-967 (40% resin solids)
* 3 Neoretz R-972 (34% resin solid component)
* 4 Neoretz R-9314 (resin solid component 40%) manufactured by Abisia K.K.
Avisia Co., Ltd. Note 5 Spencel L54 (resin solid component 32%) Dainippon Ink Co., Ltd. Note 6 Vironal MD1100 (resin solid component 30)
%) Manufactured by Toyobo Co., Ltd. * 7 Vironal MD1930 (solid resin component 30)
%) Primal B-924 (38% resin solid component) manufactured by Toyobo Co., Ltd.
* 9 High Tech E4B (resin solid component 35%) manufactured by ROHM & Haas Co. * 10 SMA resin (resin solid component 15%) manufactured by Toho Chemical Co., Ltd. Elf Atochem North America (test item evaluation method) Durability against abrasion The coating agent for the handrail belt shown in Examples 1 to 5 and Comparative Examples 1 to 4 was applied three times to the handrail belt of an escalator in a station building, the escalator was operated for 20 hours a day, and the state after one month was applied. Observed. In addition, the stain resistance was applied to a railing belt of an escalator in a station building three times, the escalator was operated for 20 hours a day, and the state after one month was observed. Table 3 shows the test results. In Table 3, “◎” in durability indicates a case where no wear was observed, and “○” indicates a case where slight wear was observed.
“X” indicates a case where the wear has occurred. In Table 3, “３” in the stain resistance indicates a case where the dirt did not enter the inside of the coating film, and “×” indicates a case where the dirt entered the inside of the coating film and the handrail belt was contaminated. In the test, the contaminated belt was washed with a nylon pad containing an abrasive, diluted with an alkaline detergent at a predetermined magnification, and then coated with a belt coating agent.

[0030]

[Table 3]

[0031]

As described above, the coating agent for a handrail belt according to the present invention has no danger such as flammability or suction harmfulness, can form a film in a short time, and has durability against abrasion. And a coating film which is easy to remove can be formed.

Continuing from the front page (72) Inventor Hiroki Asai 180 Soya, Hadano-shi, Kanagawa F-term (reference) 3F321 AA10 CF01 4J038 CC061 CD041 CD081 CE051 CF061 CG021 CG141 CG161 CG171 CH031 CH041 CH121 CH171 DB031 DB221 DD001 DG111 DG131 DH001 KA03 KA06 KA10 MA07 MA08 MA10 MA12 NA11 NA23 NA27 PA18 PB05

Claims (2)

[Claims] An aqueous coating composition for a handrail belt for coating the surface of a handrail belt, wherein the composition has a breaking strength of not less than 20 N / mm ² and a breaking elongation of not less than 100% at the time of film formation of the composition. A coating agent for handrail belts, mainly composed of resin. 2. The handrail belt coating agent according to claim 1, wherein the solid content of the compounding system is 15% or more.