KR20190004397A - Manufacturing Method of Industrial Roll and Industrial Roll Using the Same - Google Patents

Abstract

The present invention relates to a method for manufacturing an industrial roll, which is to reduce manufacturing costs and to improve productivity since workability is excellent and a curing speed is very fast, and to prevent an oil component from being leaked from a roll in use, and to an industrial roll manufactured thereby. To this end, the method of the present invention comprises the steps of: (a) preparing a shaft (10) or pipe made of a metal material (S10); (b) forming a polyurea layer (40) on an outer circumferential surface of the shaft (10) by stacking a polyurea coating solution with a spray gun (50) while rotating the shaft (10) or the pipe (S20); (c) polishing a surface of the polyurea layer (40) (S30); and (d) applying an oil leakage-preventing coating solution to the polyurea layer (40) (S50). The oil leakage-preventing coating solution includes: a main agent including polypropylene glycol, xylene, polypropylene triol, hydrotreated heavy naphtha, and propylene glycol methyl ether; and a curing agent including a caster oil polymer including polypropylene glycol and TDI, and dimethyl carbonate. The oil leakage-preventing coating solution is prepared by mixing the main agent and the curing agent in a weight ratio of 2 to 3 : 1.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an industrial roll,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method of manufacturing an industrial roll used for conveying various articles or winding a material such as a film, and more particularly, A method of manufacturing an industrial roll capable of preventing an oil component from leaking from a roll during use of the roll to thereby adversely affect the quality of the product by further applying an oil leakage preventing coating liquid to the outer peripheral surface of the polyurea layer after the urea layer is formed And an industrial roll produced thereby.

In general, rolls are manufactured in a cylindrical shape and are used in various fields of industry as parts used for transporting or winding products in the form of films or sheets.

Particularly, a film producing machine, a paper making machine, a textile machine and the like are provided with a plurality of rolls.

The above-mentioned industrial rolls are made of various materials. FIGS. 1 to 4 show a general rubber roll and a manufacturing process thereof.

 1 and 2, a rubber layer 20 of a certain thickness is formed around a shaft 10 made of a metal material. The rubber layer 20 is formed of a rubber material, It is formed of various components.

The roll equipped with the rubber layer 20 is advantageous in that it is inexpensive but has a disadvantage of damaging the surface of the article during transportation of the article because of its large frictional force.

Further, the roll having the rubber layer 20 is easily worn during use, and has a problem that the lifetime is shortened due to chemical agents.

Further, in the process of polishing the surface of the rubber layer 20, micro scratches and burrs are generated on the surface. There is a problem that the surface of the article is damaged due to such fine scratches and burrs.

In order to solve such a problem, a UV coating layer 30 may be further formed on the rubber layer 20.

Hereinafter, a conventional rubber roll manufacturing process will be described with reference to FIGS. 3 and 4. FIG.

First, a metal shaft 10 is prepared (S1). A metal pipe having a certain thickness may be used in place of the shaft 10. [

On the other hand, a rubber raw material is compounded in a separate step (S2) to produce a flat rubber sheet 20a (S3).

After the production of the flat rubber sheet 20a is completed, an adhesive is applied to the shaft 10 (S4) and the rubber sheet 20a is wound on the shaft 10 to a constant thickness.

3, the shaft 10 is positioned between the two lower rollers R1 and R2 and the upper roller R3, and the rubber sheet 20a is rotated at a constant speed Wind to thickness.

After the rubber sheet 20a is wound on the shaft 10 to a predetermined thickness, the rubber sheet 20a is cut (S5), the rubber sheet 20a is wrapped with a film (not shown) It is heated by steam of constant pressure and temperature.

Subsequently, the rubber sheet 20a is aged for a day to form a rubber layer 20, and the surface of the rubber sheet 20 is polished uniformly (S8).

When the UV coating layer 30 is formed on the rubber layer 20, the following process is further performed.

First, the surface of the rubber layer 20 is pre-cleaned (S9), coated with a UV coating solution (S10), and irradiated with ultraviolet rays (S11).

Then, the UV coating layer 30 is polished (S12), and after the post-process cleaning, dried (S13), the rubber roll having the UV coating layer 30 formed on the surface of the rubber layer 20 is completed.

However, the conventional rubber roll manufacturing method has the following problems.

First, it takes a lot of time to form the rubber layer 20.

In order to form the rubber layer by the conventional method, various rubber raw materials are first blended and melted, and then a rubber sheet 20a of flat plate shape is first produced by a rubber sheet production apparatus (not shown).

Then, an adhesive is applied to the shaft 10, the rubber sheet 20a is wound on the shaft 10 to have a predetermined thickness, and then the rubber sheet 20a is cut.

Next, the rubber sheet 20a is wound with a film (not shown), put in a kiln, and heated by steam at 150 DEG C for about 3 hours.

When the rubber layer 20 is aged for a day and then subjected to a surface treatment, the roll with the rubber layer 20 is completed. It takes about 4 -5 days to form the rubber layer 20.

Second, the conventional rubber layer forming method requires various manufacturing facilities.

That is, a rubber material mixing and heating apparatus, an apparatus for manufacturing a rubber sheet 20a, a device for winding the rubber sheet 20a around the shaft 10, a kiln for heating the rubber layer with water vapor, and the like are required.

Accordingly, a factory site for accommodating each manufacturing facility must be provided, and a worker must be arranged for each manufacturing facility, which raises the labor cost and the manufacturing cost.

Thirdly, in the rubber layer 20 manufactured by the conventional method, it is difficult to control the thickness of the rubber layer, a large number of pores are generated, and there is a problem that the rubber layer 20 is severely deformed depending on the temperature.

That is, in the conventional rubber layer forming method, as shown in FIG. 3, since the rubber sheet 20a is formed by winding the flat rubber sheet 20a, it is not easy to control the thickness of the rubber layer 20.

Further, since the rubber layer 20 is formed by winding the rubber sheet 20a, there is a high possibility that pores are generated at the interface of the rubber sheet 20a.

In addition, since the flat rubber sheet 20a is wound around the shaft 10 to form the rubber layer 20, a step is generated at the cut portion of the rubber sheet 20a, thereby increasing the defect occurrence rate.

In addition, in the conventional method of forming the rubber layer 20, since the deformation amount of the rubber is large according to the temperature, there is a problem that attention must be paid to temperature control.

Fourthly, the rubber layer produced by the conventional method contains an oil component, which causes oil to leak from the roll during use and adversely affect the article such as a film.

In order to solve the above problems, there is a method of not using an oil component in rubber compounding.

However, the rubber roll produced by this method has a disadvantage that its price is three times higher than that of a normal rubber roll.

Korean Patent No. 10-0480365 Korean Patent No. 10-1406147 Korean Patent No. 10-1533736

SUMMARY OF THE INVENTION The present invention has been made to overcome the problems of the prior art as described above, and it is an object of the present invention to provide a process for producing a rubber composition which is excellent in workability and has a very high curing speed, It has its purpose.

Another object of the present invention is to prevent the oil component from adhering to an article such as a film during use of the roll to deteriorate the quality of the article.

Another object of the present invention is to eliminate the need to form a rubber layer by winding the rubber sheet after it is manufactured.

It is a further object of the present invention to enable the rapid production of rolls in tight spaces without the need for many manufacturing facilities to manufacture the rolls.

It is still another object of the present invention to avoid the need for a rubber material mixing and heating apparatus, a rubber sheet manufacturing apparatus, a rubber sheet winding apparatus, a kiln, and the like in producing a roll.

It is a further object of the present invention to easily control the thickness of the roll and to suppress the occurrence of pores to reduce the defective rate.

It is still another object of the present invention to make it possible to produce a roll of good quality regardless of a change in temperature.

According to a first aspect of the present invention, there is provided a method of manufacturing an industrial roll used for conveying various articles or winding a thin sheet-like material, the method comprising the steps of: (a) (B) a step (S20) of continuously forming a polyurea layer on the outer circumferential surface of the shaft or pipe by continuously stacking the polyurea coating solution with the spray gun while rotating the shaft or pipe, (c) (S30) polishing the surface of the polyurethane layer, and applying an oil leakage preventing coating liquid to the outer peripheral surface of the polyurea layer (S50).

The oil leakage preventing coating liquid may further contain a main component comprising polypropylene glycol, xylene, polypropylene triol, hydrogenated heavy naphtha and propylene glycol methyl ether, and a castor oil comprising polypropylene glycol and TDI A polymer and a curing agent comprising dimethyl carbonate, wherein the oil leakage preventing coating liquid is prepared by mixing the subject and the curing agent in a weight ratio of 2 to 3: 1.

The subject matter also relates to a process for the preparation of polyolefins which comprises 45 to 50% by weight of polypropylene glycol, 35 to 40% by weight of xylene, 1 to 10% by weight of polypropylene triols, 1 to 5% by weight of hydrogenated heavy naphtha, 5% and other residues. The curing agent is characterized in that the caster oil polymer comprises 90 to 95% by weight, the dimethyl carbonate is 1 to 10% by weight, and the balance.

Further, in step S20, one end of the shaft or pipe is fixed to a chuck of a lathe, the other end is supported, and the polyurea coating is sprayed while rotating the shaft or pipe at 50 to 70 rpm to form a polyurea layer .

The polyurea layer formed in step S20 is formed by mixing the polyurea sealant and the curing agent for polyurea sealant at the same weight ratio.

The curing agent for polyurea sealant is characterized by comprising polypropylene glycol as a main component.

The curing agent for the polyurea sealant and the polyurea sealant is separately supplied to the spray gun through the polyurea sealant supply pipe and the hardener supply pipe for the polyurea sealant and mixed with each other just before being sprayed from the spray nozzle of the spray gun, As shown in FIG.

The polyurea sealant and the curing agent for polyurea sealant are heated to 60 to 80 占 폚 in a coating agent feeding device, and then supplied to the spray gun, respectively.

The coating material supply device may include a compressor to supply a high pressure to the spray gun.

(A) preparing a shaft or pipe made of a metal material (S100); (b) forming a rubber layer having a predetermined thickness on the outer periphery of the shaft or the pipe. The method for manufacturing an industrial roll according to the second embodiment of the present invention comprises the steps of (C) polishing the surface of the rubber layer (S300); and (d) applying an oil leakage preventing coating solution to the rubber layer (S500).

According to the method of manufacturing an industrial roll according to the present invention, a roll is manufactured by forming a polyurea layer directly on a shaft or a pipe by spraying, without forming a rubber layer by winding a rubber sheet, The oil leakage preventing coating liquid is applied to the outer peripheral surface of the polyurea layer.

Accordingly, there is no need to form a rubber layer by winding the rubber sheet after it is produced, and there is no need to apply an adhesive to the shaft or pipe.

Further, there is an effect that it is possible to prevent the oil component from leaking from being affected by the quality of the product during use of the roll.

Further, since the polyurea layer is cured within a few seconds, the roll can be produced easily and quickly. As a result, the work speed is increased and the productivity is greatly improved.

Further, since it does not require a rubber material mixing and heating apparatus, a rubber sheet manufacturing apparatus, a rubber sheet winding apparatus, a kiln, and the like as in the prior art, there is no need to have a large factory site, and labor costs and manufacturing cost can be greatly reduced have.

In addition, there is an effect that a high-quality roll can be manufactured quickly and easily regardless of a change in temperature even in a narrow space.

Further, since the polyurea layer is formed while being laminated by the spraying method, the thickness of the roll can be easily controlled, the occurrence of pores can be suppressed, and the defective rate can be reduced.

Further, the adhesion between the polyurea layer and the oil leakage preventing coating layer can be improved, the surface precision of the roll can be improved, and the service life can be extended.

1 is a perspective view of a roll manufactured by a conventional method;
2 is a sectional view of Fig. 1;
3 is a perspective view schematically showing a process of winding a rubber sheet on a shaft according to a conventional method.
4 is a flowchart illustrating a process of manufacturing a roll according to a conventional method.
5 is a perspective view of a roll manufactured in accordance with a first embodiment of the present invention;
Fig. 6 is a sectional view of Fig. 5; Fig.
7 is a flowchart illustrating a process of manufacturing a roll according to the first embodiment of the present invention.
FIG. 8 is a schematic perspective view illustrating a process of forming a polyurea layer according to a first embodiment of the present invention; FIG.
9 is a flowchart illustrating a process of manufacturing a roll according to a second embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to FIGS. 5 to 9. FIG.

≪ Embodiment 1 >

4 to 8 show a first embodiment of the present invention.

4, a method of manufacturing an industrial roll according to a first embodiment of the present invention includes the steps of: (a) preparing a shaft 10 made of a metal material; (b) (S20) of continuously forming a polyurea layer 40 on the outer circumferential surface of the shaft 10 by continuously stacking the polyurea coating solution with the spray gun 50 while rotating the surface of the polyurea layer 40 (S30); and (d) applying an oil leakage preventing coating liquid to the outer circumferential surface of the polyurea layer 40 (S50).

Here, the oil leakage preventing coating liquid may be at least one selected from the group consisting of polypropylene glycol, xylene, polypropylene triol, hydrogenated heavy naphtha, propylene glycol methyl ether Glycol Methyl Ether), and a caster oil polymer comprising polypropylene glycol and TDI; And a curing agent comprising dimethyl carbonate. The oil leakage preventing coating solution is prepared by mixing the above-mentioned subject and the curing agent at a weight ratio of 2 to 3: 1.

The subject matter also relates to a process for the preparation of polyolefins which comprises 45 to 50% by weight of polypropylene glycol, 35 to 40% by weight of xylene, 1 to 10% by weight of polypropylene triols, 1 to 5% by weight of hydrogenated heavy naphtha, 5%, and other remainders.

The curing agent comprises 90 to 95% by weight of a castor oil polymer, 1 to 10% by weight of dimethyl carbonate, and the balance.

The present inventors have made great efforts to develop an oil leakage preventing coating solution. As a result of the efforts made by the inventors, it has been found that when the above-mentioned subject and the hardener are blended in a ratio of 2: 3: 1, oil is not leaked from the roll Respectively.

When forming the polyurea layer 40 on the shaft 10 in step S20, as shown in Fig. 8, after a ring-shaped flange 10a is assembled to both ends of the shaft 10, (40).

That is, a feature of the present invention is that a rubber sheet 20a is manufactured and then wound on a shaft 10 to form a polyurea layer (not shown) on the shaft 10 by a spraying method without forming the rubber layer 20 40) are laminated continuously to manufacture a roll body.

Alternatively, the polyurea layer 40 may be formed in a metal pipe instead of the shaft 10. In this case, after assembling a jig having a shaft at both ends of the pipe, .

The above-mentioned polyurea has an advantage of being excellent in waterproofing, rust prevention and chemical resistance because it can be instantaneously bonded to the object to be coated and maintained at a high strength, and can change various hardness according to the application.

Also, polyurea has uniform reactivity and fast curing properties and can be coated at sub-zero temperatures regardless of the application temperature.

Accordingly, the polyurea has been applied to waterproof concrete coating, tank lining coating, and the like.

Here, the polyurea coating liquid is preferably used by mixing a polyurea sealant and a curing agent for a polyurea sealant at the same weight ratio.

This is for allowing the coating liquid to harden rapidly when the polyurea coating liquid is sprayed while rotating the shaft 10. [

If the polyurea coating solution is not cured within a few seconds, there is a problem that the coating solution flows downward without being applied to the shaft 10. [

The curing agent for polyurea sealant is preferably a curing agent containing polypropylene glycol as a main component.

By using the curing agent, the polyurea coating liquid 10 sprayed onto the shaft 10 can be cured in a few seconds, and the coating liquid can be prevented from flowing down to the lower portion of the shaft 10. [

On the other hand, when the polyurea layer 40 is formed in step S20, it may be formed using a lathe.

In this case, it is preferable that one end of the shaft 10 is fixed to the chuck of the lathe and the other end is supported, and then the polyurea coating solution is sprayed while rotating the shaft 10 at 50 to 70 rpm.

When the rotation speed of the shaft 10 is less than 50 rpm, the operation speed of forming the polyurea layer 40 is lowered. When the rotation speed is more than 70 rpm, it is difficult to uniformly form the polyurea layer 40.

Therefore, the rotation speed of the shaft 10 is preferably 50 to 70 rpm.

When the polyurea layer 40 is formed by using a lathe, the portion excluding the shaft 10 is wrapped with vinyl so that the coating liquid sprayed at the high pressure by the spray gun 50 is not caught on the shelf.

When a polyurea layer is formed on a metal pipe, a jig (not shown) provided with a shaft may be sandwiched between both ends of the pipe.

Alternatively, a dedicated machine for polyurea coating may be prepared instead of the above-described lathe, and then a polyurea layer may be formed after being installed in a closed space.

According to the above-described dedicated machine for coating, the polyurea layer can be formed quickly and easily.

The curing agent for the polyurea sealant and the polyurea sealant is supplied separately to the spray gun 50 via the polyurea sealant supply pipe (A) and the hardener supply pipe (B) for polyurea sealant, as shown in Fig. 8 do.

That is, in the present invention, the polyurea sealant and the curing agent for polyurea sealant are not mixed and injected in advance, but are supplied individually to the spray gun 50 and then sprayed to the spray gun 50 immediately before spraying from the spray nozzle of the spray gun 50 After mixing, the mixture is injected into the shaft 10.

If the polyurea sealant and the curing agent for the polyurea sealant are mixed in advance, the polyurea is cured within a few seconds due to the nature of the polyurea, so that the injection is not performed.

To prevent this, the polyurea sealant and the curing agent for the polyurea sealant are separately stored in the coating agent supply device 60 and then supplied to the spray gun 50, respectively.

It is preferable that the polyurea sealant and the polyurea sealant curing agent are heated to 60 to 80 DEG C in the coating agent supply device 60 and then supplied to the spray gun 50, respectively.

When the heating temperature is lower than 60 占 폚, the miscibility between the polyurea sealant and the polyurea sealant curing agent deteriorates, and when the heating temperature exceeds 80 占 폚, the curing rate becomes slower.

Therefore, the heating temperature of the polyurea sealant and the polyurea sealant curing agent is preferably 60 to 80 ° C.

Further, the coating agent supply device 60 includes a compressor to supply a high pressure to the spray gun 50.

By the above-described pressure, the polyurea sealant and the polyurea sealant curing agent can be easily injected through the nozzle of the spray gun 50.

Hereinafter, a manufacturing process of the industrial roll according to the first embodiment of the present invention will be described with reference to FIGS. 7 and 8. FIG.

First, a shaft 10 made of a metal material is prepared (S10). Both ends of the shaft 10 are mounted on a machine dedicated to a lathe or a coating machine, and then slowly rotated at a speed of 50 to 70 rpm.

Subsequently, the polyurea coating solution is sprayed at a high pressure using the spray gun 50 to continue to laminate the polyurea layer 40 (S20).

At this time, a polyurea layer having a low hardness may be formed first, and then a polyurea layer having a high hardness may be formed secondarily.

When the polyurea layer 40 is formed to a predetermined thickness and the production of the roll body is completed, the surface is polished (S30).

The polishing process may include roughing, finishing and polishing.

Next, the polyurea layer 40 is pretreated (S40), and an oil leakage preventing coating liquid is applied to the outer peripheral surface of the polyurea layer 40 by a spraying method (S50). Then, the surface of the polyurea layer 40 is polished ).

Then, after the post-treatment cleaning and natural drying, the production of the industrial roll having the oil leakage preventing coating layer 70 on the roll body of the polyurea layer 40 is completed.

In the first embodiment of the present invention, instead of forming a rubber layer by winding a rubber sheet as in the prior art, the polyurea layer 40 is continuously laminated on the shaft 10 by a spraying method to form a roll body .

Accordingly, it is not necessary to provide a rubber material mixing and heating apparatus, a rubber sheet manufacturing apparatus, a rubber sheet winding apparatus, a kiln, and the like in order to form a rubber layer.

As a result, a large factory site becomes unnecessary, and the manufacturing facility becomes very simple.

Further, since the polyurea coating liquid has a strong adhesive force, it is not necessary to apply the adhesive to the shaft 10 separately.

As a result, the labor cost and the manufacturing cost can be greatly reduced, and the roll can be quickly produced even in a narrow space.

In addition, since the polyurea coating liquid sprayed on the shaft 10 is hardened in a few seconds, the working speed becomes very fast, and the productivity can be remarkably improved.

That is, according to the present invention, it is possible to shorten the production time of the rolls, which took 4 to 5 days, to within one day.

Further, since the polyurea layer 40 is formed by the spraying method, it is possible to easily adjust the thickness of the polyurea layer 40, minimize the defects such as pores, and quickly produce a high quality roll have.

Particularly, the oil leakage preventing coating layer 70 can prevent the oil component from leaking from the roll during use and adversely affecting the film.

Accordingly, it can be very usefully used in manufacturing and transporting precision films used in various electronic equipments.

≪ Embodiment 2 >

Fig. 9 shows a second embodiment of the present invention.

In the second embodiment of the present invention, the rubber layer 20 is formed by a conventional method, and the oil leakage preventing coating liquid is sprayed thereon by a spray method to form the oil leakage preventing coating layer 70.

That is, the method for manufacturing a roll according to the second embodiment of the present invention includes the steps of: (a) preparing a metal shaft 10 or a pipe S100; (b) (C) coating the surface of the rubber layer 20 (S300); (d) applying an oil-leaking coating liquid to the rubber layer 20 (S500 ).

In the case of the first embodiment, the oil leakage preventing coating liquid may also contain a mixture of a subject comprising polypropylene glycol, xylene, polypropylene triol, hydrogenated heavy naphtha and propylene glycol methyl ether, A castor oil polymer comprising propylene glycol and TDI, and a curing agent comprising dimethyl carbonate. The oil leakage preventing coating liquid is prepared by mixing the above-mentioned subject and a curing agent in a weight ratio of 2 to 3: 1.

The subject matter also relates to a process for the preparation of polyolefins which comprises 45 to 50% by weight of polypropylene glycol, 35 to 40% by weight of xylene, 1 to 10% by weight of polypropylene triols, 1 to 5% by weight of hydrogenated heavy naphtha, 5% and other residues. The curing agent comprises 90 to 95% by weight of a castor oil polymer, 1 to 10% by weight of dimethyl carbonate, and other residues.

The other points are the same as those in the first embodiment, and therefore duplicate descriptions will be omitted.

The foregoing description of preferred embodiments of the present invention has been provided for purposes of illustration and description. It will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the present invention.

10: Shaft
10a: Flange
20: Rubber layer
20a: Rubber sheet
30: UV (Ultraviolet) coating layer
40: Polyurea layer
50: Spray gun
60: Coating feeder
70: oil leakage prevention coating layer
A: Polyurea sealant feed pipe
B: Curing agent feed pipe for polyurea sealant
C: pressure supply pipe

Claims (11)

A method of manufacturing an industrial roll used for conveying various articles or for winding a sheet-like material,
(a) preparing a metal shaft 10 or a pipe S10,
(b) forming a polyurea layer 40 on the outer circumferential surface of the shaft 10 by continuously stacking the polyurea coating solution with the spray gun 50 while rotating the shaft 10 or the pipe,
(c) polishing the surface of the polyurea layer 40 (S30),
(d) applying an oil leakage preventing coating liquid to the polyurea layer (40) (S50)
The oil leakage preventing coating liquid may contain,
A subject comprising polypropylene glycol, xylene, polypropylene triol, hydrogenated heavy naphtha and propylene glycol methyl ether,
A castor oil polymer comprising polypropylene glycol and TDI, and a curing agent comprising dimethyl carbonate,
Wherein the oil leakage preventive coating liquid is prepared by mixing the subject and the curing agent in a weight ratio of 2 to 3: 1. The method according to claim 1,
The above-
Wherein the polypropylene glycol is 45 to 50 wt%, the xylene is 35 to 40 wt%, the polypropylene triol is 1 to 10 wt%, the hydrogenated heavy naphtha is 1 to 5 wt%, the propylene glycol methyl ether is 1 to 5 wt% , ≪ / RTI >
The curing agent,
A castor oil polymer in an amount of 90 to 95% by weight, a dimethyl carbonate in an amount of 1 to 10% by weight, and the balance of other ingredients. The method according to claim 1,
In step S20,
After the shaft 10 or one end of the pipe is fixed to the chuck of the lathe and the other end is supported, the polyurea layer 40 is laminated by spraying the polyurea coating solution while rotating the shaft 10 at 50 to 70 rpm ≪ / RTI > The method according to claim 1,
The polyurea layer (40) formed in the step (S20)
Wherein the polyurea sealant and the curing agent for the polyurea sealant are mixed at the same weight ratio. 5. The method of claim 4,
Wherein the curing agent for polyurea sealant comprises polypropylene glycol. 5. The method of claim 4,
The curing agent for the polyurea sealant and the polyurea sealant may be,
Are individually supplied to the spray gun 50 through the polyurea sealant supply pipe (A) and the hardener supply pipe (B) for polyurea sealant,
Are mixed with each other immediately before being sprayed from the spray nozzle of the spray gun (50), and then sprayed onto the shaft (10) or the pipe. 5. The method of claim 4,
Wherein the polyurea sealant and the curing agent for a polyurea sealant are heated to 60 to 80 캜 in a coating agent supply device (60), and then supplied to the spray gun (50), respectively. 8. The method of claim 7,
Wherein the coating agent supply device (60) is provided with a compressor to supply a high pressure to the spray gun (50). A method of manufacturing an industrial roll used for conveying various articles or for winding a sheet-like material,
(a) preparing a metal shaft 10 or pipe S100,
(b) forming (S200) a rubber layer 20 having a predetermined thickness on the outer circumference of the shaft 10 or the pipe,
(c) polishing the surface of the rubber layer 20 (S300),
(d) applying an oil leakage preventing coating liquid to the rubber layer (S500)
The oil leakage preventing coating liquid may contain,
A subject comprising polypropylene glycol, xylene, polypropylene triol, hydrogenated heavy naphtha and propylene glycol methyl ether,
A castor oil polymer comprising polypropylene glycol and TDI, and a curing agent comprising dimethyl carbonate,
Wherein the oil leakage preventive coating liquid is prepared by mixing the subject and the curing agent in a weight ratio of 2 to 3: 1. 10. The method of claim 9,
The above-
Wherein the polypropylene glycol is 45 to 50 wt%, the xylene is 35 to 40 wt%, the polypropylene triol is 1 to 10 wt%, the hydrogenated heavy naphtha is 1 to 5 wt%, the propylene glycol methyl ether is 1 to 5 wt% , ≪ / RTI >
The curing agent,
A castor oil polymer in an amount of 90 to 95% by weight, a dimethyl carbonate in an amount of 1 to 10% by weight, and the balance of other ingredients. An industrial roll produced by the production method according to any one of claims 1 to 10.

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