JP6644929B1 - Handrail belt coating method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for coating a handrail belt capable of obtaining a high gloss while ensuring high adhesion between the surface of the handrail belt and a protective film, and further reducing the operation time. SOLUTION: In the method for coating a handrail belt, a step of cleaning the surface of the handrail belt and then primer-applying an isocyanate to the surface of the handrail belt; And a step of applying a coating agent to be applied. [Selection diagram] None

Description

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

Generally, the material of the surface layer of a handrail belt such as an escalator or a moving sidewalk installed in many places such as department stores, home centers, public facilities and station buildings is made of urethane rubber or CSM (chlorosulfonated polyethylene) rubber.
In many cases, a coating agent is applied to the handrail belt to prevent deterioration of the belt base material and to provide aesthetic and clean feeling, and a protective film is formed on the surface of the handrail belt.
Escalators, handrail belts such as moving sidewalks, are narrowly pressed by the feed roller and driven while bending, so that the protective film may peel off the handrail belt due to friction of the feed roller and bending of the handrail belt itself, High adhesion to handrail belts is required.

  Conventionally, as a method for improving the adhesion between the handrail belt and the protective film, the surface of the handrail belt is polished with an abrasive having a particle size of # 150 to # 400, and peaks and valleys of 2 to 3 μm are formed on the belt surface. The surface of the handrail belt is polished with an abrasive material of # 600 to # 0.3 to 0.5 μm on the slopes of the peaks and valleys of 2 to 3 μm to thereby achieve adhesion to the protective film by the anchor effect. A method of coating a handrail belt has been proposed (for example, see Patent Document 1).

  However, by polishing the surface of the handrail belt, high adhesion between the surface of the handrail belt and the protective film can be obtained, but the gloss deteriorates. There was a problem that we had to do more.

  In order to solve such a problem, the surface of a handrail (railing belt) made of a urethane resin base material is washed, and the surface of the washed handrail is washed with water-resistant paper in the order of 400, 600, and 800. The rough polished surface is polished with a water-resistant paper of 1500 or more, a silane coupling agent is applied to the polished surface, and an aqueous urethane resin is applied to the surface on which the silane coupling agent is applied. A method for coating a handrail in which a resin is applied and then dried by irradiating a heating lamp is disclosed (for example, see Patent Document 2).

JP-A-3-79689 JP 2018-58685 A

However, according to the coating method described in Patent Document 2, the roughened surface of the handrail is polished with a water-resistant paper of 1500 or more to compensate for a decrease in adhesion to the aqueous urethane resin film due to insufficient anchor effect. Was coated with a silane coupling agent as a primer, but this was enough to compensate for the decrease in adhesion to the aqueous urethane resin film due to insufficient anchor effect, and the adhesion was insufficient.
Even if the rough polished surface of the handrail is polished with a water-resistant paper of 1500 or more, polishing marks remain on the surface of the handrail, and the effect on gloss cannot be eliminated.

  The present inventors have conducted repeated tests on a method of coating a handrail belt that achieves both adhesion and gloss of a handrail belt and a protective film.As a result, a primer containing isocyanate is applied, or a coating containing an aqueous urethane resin as a main component. The present inventors have found that a composition obtained by adding an isocyanate to an agent is applied, and the present invention has been completed.

  An object of the present invention is to provide a method for coating a handrail belt that can obtain high gloss while further ensuring high adhesion between the surface of the handrail belt and the protective film, and further reduce the operation time. Is to provide.

In order to solve the above-mentioned problems, the invention according to claim 1 is a method for coating a handrail belt whose surface layer is made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber. The method includes a step of applying a primer containing an isocyanate, and a step of applying a coating agent containing an aqueous urethane resin as a main component on a surface to which the primer is applied after the application of the primer.

According to the first aspect of the present invention, a primer containing isocyanate is applied to the surface of a handrail belt made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber, and a water-based urethane is applied to the surface of the primer. Since a coating agent containing a resin as a main component is applied, high adhesion between the surface of the handrail belt and the protective film can be secured by the isocyanate.
In addition, since this adhesion can be sufficiently obtained even on a bare surface of the handrail belt without polishing, the step of polishing the surface of the belt can be omitted, the operation time can be shortened accordingly, and the polishing powder due to polishing can be reduced. It does not occur and the working environment can be improved.
In addition, if the surface of the handrail belt is not polished, there is no factor that hinders the gloss by polishing the surface of the handrail belt, and there is a certain degree of gloss from the bare surface state. This can also shorten the coating operation time.

The invention according to claim 2 is a method for coating a handrail belt whose surface layer is made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber, wherein the surface of the handrail belt is mainly composed of an aqueous urethane resin. A step of applying an isocyanate to a coating agent to be applied.

According to the invention described in claim 2, isocyanate is added to the surface of a handrail belt made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber to a coating agent mainly composed of an aqueous urethane resin. Since the coated material is applied, high adhesion between the surface of the handrail belt and the protective film can be secured by the isocyanate added to the coating agent.
In addition, since this adhesion can be sufficiently obtained even on a bare surface of the handrail belt without polishing, the step of polishing the surface of the belt can be omitted, the operation time can be shortened accordingly, and the polishing powder due to polishing can be reduced. It does not occur and the working environment can be improved.
In addition, if the surface of the handrail belt is not polished, there is no factor that hinders the gloss by polishing the surface of the handrail belt, and there is a certain degree of gloss from the bare surface state. This can also reduce the working time.
Further, since a coating material containing an aqueous urethane resin as a main component and an isocyanate added thereto is applied to the surface of the handrail belt, the step of applying a primer is eliminated, and the work can be shortened accordingly.

The invention according to claim 3 is a method for coating a handrail belt whose surface layer is made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber, and a step of applying a primer containing isocyanate to the surface of the handrail belt. And, after the application of the primer, a step of applying a coating agent containing an aqueous urethane resin as a main component to which isocyanate is added, on the application surface of the primer.

According to the invention as set forth in claim 3, a step of applying a primer containing isocyanate to the surface of a handrail belt made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber, and after the application of the primer Since, on the surface to which the primer is applied, a coating agent containing an aqueous urethane resin as a main component and an isocyanate added is applied, the ratio of the isocyanate added to the coating agent mainly containing an aqueous urethane resin to the coating agent is small. Also, high adhesion between the belt surface and the protective film can be ensured.
In addition, since this adhesion can be sufficiently obtained even on a bare surface of the handrail belt without polishing, the step of polishing the surface of the belt can be omitted, the operation time can be shortened accordingly, and the polishing powder due to polishing can be reduced. It does not occur and the working environment can be improved.
Also, if the surface of the handrail belt is not polished, there is no factor that hinders the gloss by polishing the surface of the handrail belt, and there is a certain degree of gloss from the bare surface state, so it is possible to obtain high gloss with a small number of applications of the coating agent This can also reduce the working time.

  According to a fourth aspect of the present invention, the amount of the isocyanate to be added to the coating agent containing the aqueous urethane resin as a main component according to the second or third embodiment is such that the amount of the isocyanate added is a coating agent containing the aqueous urethane resin as a main component. Is 0.1 to 50 parts by weight with respect to 100 parts by weight.

  According to the invention described in claim 4, the amount of the isocyanate to be added to the coating agent containing the aqueous urethane resin as a main component is such that the coating agent containing the aqueous urethane resin as a main component is 100 parts by weight based on 100 parts by weight. Since the isocyanate is 0.1 to 50 parts by weight, high adhesion between the surface of the handrail belt and the protective film can be ensured by the isocyanate added to the coating agent containing the aqueous urethane resin as a main component. .

  As described above, according to the method for coating a handrail belt according to the present invention, it is possible to obtain high gloss while securing high adhesion between the surface of the handrail belt and the protective film, and further reduce the operation time. can do.

  Hereinafter, an example of a mode for carrying out a method for coating a handrail belt according to the present invention will be described.

First, a first example of an embodiment of a handrail belt coating method according to the present invention will be described.
The method for coating a handrail belt according to the first example includes a step of applying a primer containing isocyanate to the surface of the handrail belt, and a step of applying a coating agent containing an aqueous urethane resin as a main component to a surface of the primer after the primer is applied. And will be described in detail below.

In the first example, the surface of the handrail belt is cleaned before applying the primer. The handrail belt has a surface layer made of urethane rubber or CSM (chlorosulfonated polyethylene) rubber, and is made of urethane rubber in the first example. In cleaning the surface of the handrail belt, in this example, after applying a cleaning solution to the surface of the handrail belt to remove dirt, the dirty cleaning solution is wiped off with a cloth, sponge, etc., and the surface is washed with a cloth impregnated with water. Wipe with water. The washing liquid used for this washing is not particularly limited, and surfactants such as nonionic surfactants, anionic surfactants and cationic surfactants, organic solvents, sequestering agents, pH adjusters, etc. Can be mentioned.
Cleaning the surface of the handrail belt before applying the primer is not an essential step. For example, when coating a newly replaced handrail belt, cleaning of the surface of the handrail belt can be omitted.
Further, in the first example, the polishing step for forming a rough surface on the surface of the handrail belt before the application of the primer is not performed. It can be carried out.

After completing the cleaning of the handrail belt surface, a primer containing isocyanate is applied to the handrail belt surface. Here, the primer containing isocyanate of the present application includes not only a primer composed of isocyanate and other components, but also a primer composed of only isocyanate. Other components include water and organic solvents, which dilute the isocyanate.
The isocyanate used for the primer is not particularly limited as long as it has two or more isocyanate groups per molecule. The isocyanate group in the isocyanate to be used may be an isocyanate group having a protecting group, for example, an isocyanate group which forms an isocyanate regenerating functional group in which the isocyanate group is temporarily protected by a blocking agent treatment or the like. Is also good. Examples of the isocyanate to be used include aromatic polyisocyanates such as tolylene diisocyanate and xylylene diisocyanate, alicyclic isocyanates such as isophorone diisocyanate, and aliphatic polyisocyanates such as hexamethylene diisocyanate. They can be used in combination. More specifically, lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate; alicyclic polyisocyanates such as diclopentylene diisocyanate, cyclohexylene diisocyanate, and isophorone diisocyanate; 2,4-tolylene diisocyanate; Aromatic diisocyanates such as 4'-diphenylmethane diisocyanate, xylylene diisocyanate, polymethylene polyphenyl diisocyanate; trimethylolpropane / tolylene diisocyanate trimer adduct (trade name "Coronate L", manufactured by Tosoh Corporation); trimethylolpropane / Hexamethylene diisocyanate trimer adduct (trade name “Coronate HL” manufactured by Tosoh Corporation), isocyanuric acid of hexamethylene diisocyanate Isocyanate adducts such as polyisocyanates (manufactured by Tosoh Corporation, trade name "Coronate HX"); polyisocyanates such as polyether polyisocyanate and polyester polyisocyanate; adducts of these polyisocyanates with polyols; And polyisocyanates polyfunctionalized by an isocyanurate bond, a burette bond, an allophanate bond, or the like.
The isocyanate is preferably an isocyanate that can be dissolved or dispersed in water, and a water-dispersible or self-emulsifying isocyanate is suitably used.

After the application of the primer, a coating agent mainly composed of an aqueous urethane resin for forming a protective film is applied to the surface to which the primer is applied, and dried.
Aqueous urethane resin is usually emulsified or self-emulsified while urethane prepolymer obtained by previously reacting diol and diisocyanate and, if necessary, dimethylolalkanoic acid in the presence of an emulsifier is dispersed in water. Is a dispersion obtained by

  In the first example, as a coating agent, a urethane-based compound disclosed in JP-A-2002-338898, which has a breaking strength at the time of film formation of the compound of 20 N / mm 2 or more and a breaking elongation of 100% or more, is used. A coating agent containing an aqueous resin as a main component and appropriately adding a plasticizer, a film forming aid, a wetting agent, and the like is used.

  The application of the coating agent on the surface of the handrail belt is not particularly limited, and is performed by a known application means using a general brush, a roller, a spray, or the like. Also, in the drying means, known drying means such as natural drying is used, but when drying by blowing dry air, since it can be dried in a short time to form a protective film, The work time in the coating work can be reduced. Although the number of times of recoating is not particularly limited, it is preferably about two or three times in consideration of the work time and the glossiness.

  According to the method for coating a handrail belt of the first example described above, a primer containing isocyanate is applied to the surface of the handrail belt, and a coating agent containing an aqueous urethane resin as a main component is applied to the primer application surface. High adhesion between the surface of the handrail belt and the protective film can be ensured.

  In addition, since this adhesion can be sufficiently obtained even on a bare surface of the handrail belt without polishing, the step of polishing the surface of the belt can be omitted, the operation time can be shortened accordingly, and the polishing powder due to polishing can be reduced. It does not occur and the working environment can be improved.

  In addition, if the surface of the handrail belt is not polished, there is no factor that hinders the gloss by polishing the surface of the handrail belt, and there is a certain degree of gloss from the bare surface state. This can also shorten the coating operation time.

A second example of the embodiment of the handrail belt coating method according to the present invention will be described.
The method of coating the handrail belt of the second example includes a step of cleaning the surface of the handrail belt, and after cleaning the surface of the handrail belt, adding an isocyanate to a coating agent mainly containing an aqueous urethane resin on the surface of the handrail belt. The method includes a step of applying an object, which will be described in detail below.

  The difference between the second example and the first example is that, in the first example, after a primer containing isocyanate is applied to the surface of the handrail belt, a coating agent mainly composed of an aqueous urethane resin is applied to the primer application surface. In the second example, the only difference is that a coating agent containing an aqueous urethane resin as a main component and an isocyanate added thereto is applied to the surface of the handrail belt.

The amount of the isocyanate to be added to the aqueous urethane resin is 0.1 to 50 parts by weight, preferably 3 to 30 parts by weight, based on 100 parts by weight of the coating agent containing the aqueous urethane resin as a main component.
If the amount of isocyanate is less than 0.1 part by weight, good adhesion between the surface of the handrail belt and the protective film cannot be obtained, and if it exceeds 50 parts by weight, the protective film becomes too hard to follow the bending.

  The material of the surface layer portion of the handrail belt, the cleaning of the surface of the handrail belt, the isocyanate, and the coating agent mainly containing an aqueous urethane resin are the same as those in the first example. Is omitted.

A third embodiment of the handrail belt coating method according to the present invention will be described.
The method of coating the handrail belt of the third example includes a step of cleaning the surface of the handrail belt, a step of cleaning the surface of the handrail belt, and a step of applying a primer containing isocyanate to the surface of the handrail belt; The method includes a step of applying an isocyanate to a coating agent containing an aqueous urethane resin as a main component on a surface to which the primer is applied.

The material of the surface part of the handrail belt, the cleaning of the surface of the handrail belt, the primer containing isocyanate, and the coating agent mainly containing an aqueous urethane resin are the same as those in the first example. The explanation is omitted here.
The amount of isocyanate to be added to the coating agent containing an aqueous urethane resin as a main component is the same as that in the second example, and thus the description of the second example is referred to and the description is omitted.

  The features of the method for coating a handrail belt according to the present invention will be described 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.

[Example 1]
A white pad (Scotch / Bright Pad No. 7445 White / 3M Japan Co., Ltd.) containing an alkaline detergent (manufactured by Grist 1100 / Linley Co.) diluted 10 times with water on the surface of a urethane rubber handrail belt ), The surface was wiped with water and dried, and then the gloss of the substrate surface was measured with a gloss meter (micro-TRI-gloss / BYK-Gardener).

  A water-dispersible isocyanate (EBC primer / manufactured by Linley Co., Ltd.) was applied once on the surface of the urethane rubber handrail belt after washing with a special cloth. After drying, a coating agent (mixture of EBC-500 and EBC auxiliary / manufactured by Linley Co., Ltd.) containing an aqueous urethane resin as a main component was applied once with a special cloth, dried, and the gloss was measured with a gloss meter. This operation was repeated a total of three times to form a protective film on the surface of the urethane rubber handrail belt.

  As a test of the adhesion between the surface of the urethane rubber handrail belt and the protective film, a 25 mm cross cut at 2 mm intervals specified in JIS-K5600-5-6 was applied to the protective film formed on the surface of the urethane rubber handrail belt. Then, a rubber member as a driven roller of an escalator was rubbed with a load of 1 kg, and the number of times of rubbing until the coating film in a portion corresponding to three cross-cut squares was peeled off was measured.

  Table 1 shows the test results. As is clear from Table 1, a high gloss value was obtained after one application, and an extremely high gloss value was obtained after three applications. Also, extremely high adhesion was obtained between the surface of the urethane rubber handrail belt and the protective film.

[Example 2]
As a base adjustment, a polishing pad (Kenmaron No. 320 / manufactured by Sankyo Rikagaku Co., Ltd.) containing the surface of a urethane rubber handrail belt containing an alkaline detergent (manufactured by Grist 1100 / Linley Co., Ltd.) diluted 10 times with water. After polishing with a # 400, # 800, and # 1500 abrasive in this order while spraying the same alkaline detergent, wiping the surface with water and drying, the gloss of the substrate surface is measured with a gloss meter. It was measured.

A water-dispersible isocyanate (EBC primer / manufactured by Linley Co., Ltd.) was applied once on the surface of the urethane rubber handrail belt after the base adjustment using a special cloth. After drying, a coating agent (mixture of EBC-500 and EBC auxiliary / manufactured by Linley Co., Ltd.) containing an aqueous urethane resin as a main component was applied once with a special cloth, dried, and the gloss was measured with a gloss meter. This operation was repeated a total of three times to form a protective film on the surface of the urethane rubber handrail belt.
After forming the protective film, the same adhesion test as in Example 1 was performed.

  Table 1 shows the test results. As is evident from Table 1, in one application, the gloss value was lower than that in Example 1, but still high, and the gloss value was extremely high in three applications. In addition, higher adhesion than in Example 1 was obtained between the surface of the urethane rubber handrail belt and the protective film.

[Example 3]
The same cleaning as in Example 1 was performed on the surface of the urethane rubber handrail belt. On the surface of the urethane rubber handrail belt after washing, 100 parts by weight of a coating agent (a mixture of EBC-500 and an EBC auxiliary / manufactured by Linley Co., Ltd.) containing water-based urethane resin as a main component was dispersed in water. A coating liquid containing 0.1, 1, 3, 6, 10, 30, and 50 parts by weight of isocyanate (EBC primer / manufactured by Rinley Co., Ltd.) in an isocyanate content is applied once with a special cloth, dried, and glossed. It was measured with a gloss meter. This operation was repeated a total of three times to form a protective film on the surface of the urethane rubber handrail belt.
After forming the protective film, the same adhesion test as in Example 1 was performed.

  Table 1 shows the test results. As is clear from Table 1, a high gloss value was obtained after one application, and an extremely high gloss value was obtained after three applications. Compared to Comparative Example 1 in which isocyanate was not added under the same washing conditions, the effect of improving the adhesion was obtained with an isocyanate addition amount of 0.1 to 50 parts by weight. In addition, with 3 to 30 parts by weight of the isocyanate, higher adhesiveness was obtained as compared with Comparative Example 2 in which the substrate was adjusted by polishing.

[Example 4]
The same base adjustment as in Example 2 was performed on the surface of the urethane rubber handrail belt. The surface of the urethane rubber handrail belt after the base adjustment was dispersed in water with respect to 100 parts by weight of a coating agent (mixture of EBC-500 and EBC auxiliary / manufactured by Linley Co., Ltd.) containing an aqueous urethane resin as a main component. Coating liquid containing 0.1, 1, 3, 6, 10, 30, and 50 parts by weight of an isocyanate (EBC primer / manufactured by Rinlei Co., Ltd.) in isocyanate content is applied once with a special cloth, dried, and glossed. Was measured with a gloss meter. This operation was repeated a total of three times to form a protective film on the surface of the urethane rubber handrail belt.
After forming the protective film, the same adhesion test as in Example 1 was performed.

  Table 1 shows the test results. As is clear from Table 1, the gloss was lower than that of Example 1 in one application, but was extremely high in three applications. Compared to Comparative Example 2 in which isocyanate was not added under the same washing conditions, the effect of improving the adhesion was obtained with an isocyanate addition amount of 0.1 to 50 parts by weight. In addition, with an isocyanate addition amount of 1 to 30 parts by weight, higher adhesion was obtained as compared with Comparative Example 2 in which the substrate was adjusted by polishing.

[Example 5]
The same cleaning as in Example 1 was performed on the surface of the urethane rubber handrail belt. A water-dispersible isocyanate (EBC primer / manufactured by Linley Co., Ltd.) was applied once on the surface of the urethane rubber handrail belt after washing with a special cloth. After drying, a water-dispersible isocyanate (EBC primer / Linley Co., Ltd.) is used with respect to 100 parts by weight of a coating agent (mixture of EBC-500 and EBC auxiliary / Linley Co.) containing an aqueous urethane resin as a main component. ) Was added once with a special cloth and dried, and the gloss was measured with a gloss meter. This operation was repeated a total of three times to form a protective film on the surface of the urethane rubber handrail belt.
After forming the protective film, the same adhesion test as in Example 1 was performed.

  Table 1 shows the test results. As is clear from Table 1, a high gloss value was obtained after one application, and an extremely high gloss value was obtained after three applications. Also, extremely high adhesion was obtained between the surface of the urethane rubber handrail belt and the protective film.

[Comparative Example 1]
The same cleaning as in Example 1 was performed on the surface of the urethane rubber handrail belt. A coating agent containing a water-based urethane resin as a main component (a mixture of EBC-500 and an EBC auxiliary / manufactured by Linley Co., Ltd.) is applied once on the surface of the urethane rubber handrail belt after washing with a special cloth and dried. And measured the gloss with a gloss meter. This operation was repeated a total of three times to form a protective film on the surface of the urethane rubber handrail belt.
After forming the protective film, the same adhesion test as in Example 1 was performed.

  Table 1 shows the test results. As is evident from Table 1, a high gloss value was obtained after one application, and an extremely high gloss value was obtained after three applications, but the adhesion between the surface of the urethane rubber handrail belt and the protective film was as follows. It was much lower than in Examples 1, 2, 3, 4, and 5.

[Comparative Example 2]
The same base adjustment as in Example 2 was performed on the surface of the urethane rubber handrail belt. A coating agent (a mixture of EBC-500 and an EBC auxiliary / manufactured by Linley Co., Ltd.) containing an aqueous urethane resin as a main component is applied once to the surface of the urethane rubber handrail belt after the base adjustment using a special cloth. After drying, the gloss was measured with a gloss meter. This operation was repeated a total of three times to form a protective film on the surface of the urethane rubber handrail belt.
After forming the protective film, the same adhesion test as in Example 1 was performed.

  Table 1 shows the test results. As is clear from Table 1, the gloss value of one application was much lower than that of Examples 1, 3, and 5, and the gloss value of Examples 1, 3, and 5 was not reached even by three applications. . Further, the adhesion between the surface of the urethane rubber handrail belt and the protective film is much lower than the isocyanate addition amount of 3 to 30 parts by weight in Examples 1, 2, 4, 5, and 3. Met.

[Comparative Example 3]
The same base adjustment as in Example 2 was performed on the surface of the urethane rubber handrail belt. An epoxy-based silane coupling agent (KBM-403 / manufactured by Shin-Etsu Chemical Co., Ltd.) was applied once to the surface of the urethane rubber handrail belt after the base adjustment using a special cloth. After drying, a coating agent containing an aqueous urethane resin as a main component (a mixed solution of EBC-500 and an EBC auxiliary agent was applied once with a special cloth, dried, and the gloss was measured with a gloss meter. This operation was repeated three times in total. Thus, a protective film was formed on the surface of the urethane rubber handrail belt.
After forming the protective film, the same adhesion test as in Example 1 was performed.

Table 1 shows the test results. As is clear from Table 1, the gloss value of one application was much lower than that of Examples 1, 3, and 5, and the gloss value of Examples 1, 3, and 5 was not reached even by three applications. . Further, the adhesion between the surface of the urethane rubber handrail belt and the protective film is much lower than the isocyanate addition amount of 3 to 30 parts by weight in Examples 1, 2, 4, 5, and 3. Met.

Claims (4)

A method for coating a handrail belt, comprising: a step of applying a primer containing isocyanate to the surface of a handrail belt made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber ; A method for coating a handrail belt, comprising a step of applying a coating agent mainly composed of an aqueous urethane resin to an application surface. A method of coating a handrail belt, wherein a surface layer material is made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber, and a surface of a handrail belt is made by adding an isocyanate to a coating agent mainly composed of an aqueous urethane resin. A method for coating a handrail belt, comprising: A method for coating a handrail belt, comprising: a step of applying a primer containing isocyanate to the surface of a handrail belt made of urethane rubber or chlorosulfonated polyethylene (CSM) rubber ; A method for coating a handrail belt, comprising a step of applying an isocyanate to a coating agent containing an aqueous urethane resin as a main component on an application surface.   The amount of the isocyanate to be added to the coating agent mainly containing the aqueous urethane resin is 0.1 to 50 parts by weight based on 100 parts by weight of the coating agent mainly containing the aqueous urethane resin. The method for coating a handrail belt according to claim 2 or 3, wherein: