KR20110011303A - Apparatus of polyurethane coating for roller - Google Patents

Abstract

PURPOSE: A polyurethane coating device for a roller is provided to remove the roller manufacturing time, and reduce the production costs. CONSTITUTION: A polyurethane coating device for a roller comprises a frame(10), jigs(20a,20b) which are installed in both sides of frame, a driving part(30) which is combined in one side of jig, and rotates the metallic core, a storage tank storing a main material and hardener, a mixing head part(50) mixes the main material and hardener, a jetting part(60) which is combined in the mixing head part, and a moving part(70) which is horizontally moved according to the rail horizontally installed in frame.

Description

Polyurethane coating device for rollers {apparatus of polyurethane coating for roller}

The present invention relates to a polyurethane coating apparatus, and more particularly, to a polyurethane coating apparatus for a roller capable of coating a polyurethane on an outer circumferential surface while rotating a roller without a mold.

Industrial rubber rollers are an integral part of industrial equipment and manufacturing lines in a variety of fields, including steel, paper, textile, rubber, film and printing.

This industrial roller manufacturing method has been produced in the past, in the case of the material and the manufacturing method of the roller, in the past by mixing the general rubber into a mold.

However, in recent years, production through the casting method made of polyurethane has been expanded by various process-specific characteristics and requirements such as chemical resistance, oil resistance, and wear resistance.

In particular, in the case of special processes such as machinery, steelmaking, printing, the demand for rollers using the casting method is expanding due to the physical properties of polyurethane.

Conventional casting method is prepared by preparing the resin (RESIN), prepolymer (PREPOLYMER), and preparing a mold for casting and putting the material into the mold to complete the process through curing, drying and maturing, and then the post-process on the shelf This completes the final product.

This conventional process requires a high temperature device for preheating the copolymer, resin, and chain extender for hardness control, and a mold for casting the material is indispensable. In particular, in the case of a product requiring a fast time, there is a disadvantage that can not respond quickly due to the mold production time and the mold production time.

In addition to rollers and cylinders having metal cores, as well as products of various shapes incorporating cores, individual molds must be manufactured according to the final product, and resins are poured into the molds to be cured, followed by post-processing. Due to the hassle, there is a problem of production cost and production time.

The present invention has been made to solve the above problems, the object of the present invention is to provide a polyurethane coating device for rollers that can be cured at room temperature without the need for a mold.

Still another object of the present invention is to provide a roller coating apparatus for polyurethane, which can reduce manufacturing time and manufacturing cost of the roller.

Roller polyurethane coating apparatus according to the present invention is a frame, a jig which is installed on both sides of the frame and the metal core is horizontally fixed, a drive unit coupled to one side of the jig to rotate the metal core, and the main and hardener A storage tank each stored, a mixing head portion in which the main material and the curing agent supplied from the storage tank are mixed, a spraying portion coupled to the mixing head part to inject the main material and the curing agent onto the outer circumferential surface of the metal core, and the mixing head part And a moving part fixed to the moving part and horizontally moved along a rail installed horizontally in the frame, and a control unit controlling the injection amount of the main body and the curing agent injected from the injection part and the driving part and the moving part.

Here, the injection portion is continuously changed in the inner cross section from circular to rectangular, characterized in that each cross-sectional area is the same.

In addition, the mixing head portion comprises a housing, a drive motor installed on the upper side of the housing, an impeller installed inside the housing and rotated through the drive motor, and an injection port coupled to the storage tank is coupled. , The main body and the curing agent introduced through the inlet is mixed and discharged to the injection unit.

The moving unit may further include a vertical moving unit for vertically moving the mixing head unit and the injection unit.

Finally, the subject is an isocyanate terminal prepolymer prepared by the reaction of a polyol having a molecular weight of 1,000 to 3,000 with a diisocyanate having an aromatic group and having an isocyanate content of 5 to 20% and a viscosity of 500 to 4,000 (at 50 ° C), The curing agent is composed of 10 to 80 parts by weight of diamine having an aromatic group, 100 to 5 parts by weight of polyol having a molecular weight of 500 to 2,000, 0.05 to 1.5 parts by weight of catalyst, and 0.05 to 2 parts by weight of additive, and has a viscosity of 50 to 1,000 (at 25 ° C), The main material and the curing agent are characterized in that used in the same equivalence ratio and the hardness of the prepared polyurethane elastomer is characterized in that 65 ~ 100 (ASKER A).

Roller polyurethane coating apparatus according to the present invention by spraying the main and hardener to the outer peripheral surface of the metal core rotated through the drive unit can be cured at room temperature to complete the product, there is an advantage that can shorten the production time of the roller .

In addition, there is an advantage that the loss of the material can be reduced compared to the manufacturing method using a conventional mold can reduce the production cost.

Hereinafter, with reference to the accompanying drawings will be described in more detail the polyurethane coating device for rollers of the present invention.

1 is a front view showing a polyurethane coating device for a roller according to an embodiment of the present invention, Figure 2 is a side view of Figure 1, Figure 3 is a plan view of Figure 1.

As shown in FIG. 1, the polyurethane coating apparatus for rollers according to the present invention includes a frame 10 and jigs 20a and 20b installed on both sides of the frame 10 so that the metal core 1 is horizontally fixed. And a driving unit 30 coupled to one side of the jig 20a and 20b to rotate the metal core 1, a storage tank (not shown) in which a main material and a hardener are stored, and a main material supplied from the storage tank. A mixing head portion 50 into which a curing agent is mixed, a spraying portion 60 coupled to the mixing head portion 50 to inject a main body and a curing agent onto an outer circumferential surface of the metal core 1, and the mixing head portion 50. ) Is fixed and comprises a moving part 70 horizontally moved along a rail installed horizontally in the frame, and a control unit controlling the injection amount of the main and hardeners injected from the injection part and the driving part and the moving part.

The frame 10 serves as a skeleton in which each component is installed, and the jigs 20a and 20b allow the metal core 1 to be coated to be horizontally installed. As shown in FIG. 1, the metal core has protrusions 2 formed on both sides thereof to be coupled to the jigs 20a and 20b.

The driving unit 30 is installed on one side 20b of the jig to rotate the metal core 1.

Next, as shown in FIG. 2, the control unit controls the injection amount of the main agent and the hardener injected from the injection unit 60, and the driving unit 30 and the moving unit 70. Specifically, the driving unit 30 and the moving unit 70 may control the rotation speed by using a server motor.

Therefore, as illustrated in FIG. 3, the moving unit may be moved horizontally along the rail 12 installed horizontally in the frame 10.

In addition, the moving part 70 may further include a vertical moving part for vertically moving the mixing head part and the injection part.

Although not shown in detail in FIG. 1, since the rail is installed vertically and the LM guide or the servo motor may be installed to move the mixing head 50 along the rail, detailed description thereof will be omitted.

Next, the injection unit and the mixing head will be described.

First, Figure 4 is a conceptual diagram showing an injection unit according to an embodiment of the present invention.

As shown in FIG. 4, the injection unit 60 continuously changes an inner cross section from a circle to a rectangle, and each cross section is identical.

As shown in (a) of FIG. 4, the spraying portion has a long rectangular cross section so as to be evenly applied to the outer circumferential surface of the metal core, and the mixing head portion and the connecting portion have a circular cross section.

Therefore, it naturally changes from the cross section shown in FIG. 4B to the cross section shown in FIG. 4C through the cross section shown in FIG. 4C, and each cross-sectional area is preferably manufactured to be the same.

 5 is a conceptual diagram illustrating a mixing head unit according to an exemplary embodiment of the present invention.

As shown in FIG. 5, the mixing head part is installed inside the housing 52, the drive motor 54 installed above the housing 52, and the housing 52, and rotates through the drive motor 54. Including the impeller 56 and the inlet port 58 is coupled to the connection pipe (3) connected to the storage tank, it is mixed with the main and the curing agent flowing through the inlet port 58 is discharged to the injection unit.

The impeller 56 is a constant stirring blade (56a) is formed so that the mixing pressure of the main material and the curing agent can occur uniformly.

Next, the subject and the hardener used in the present invention will be described.

The material used in the present invention should be capable of curing at room temperature.

Therefore, the subject matter used in the present invention is prepared through the reaction of a polyol having a molecular weight of 1,000 to 3,000 with a diisocyanate having an aromatic group and an isocyanate terminal having an isocyanate content of 5 to 20% and a viscosity of 500 to 4,000 (at 50 ° C). It is a prepolymer, and the curing agent is composed of 10 to 80 parts by weight of diamine having an aromatic group in 100 parts by weight of a polyol having a molecular weight of 500 to 2,000, a catalyst of 0.05 to 1.5 parts by weight, and an additive of 0.05 to 2 parts by weight and a viscosity of 50 to 1,000 (at 25 ° C). However, the subject and the curing agent are preferably used in the same equivalent ratio, characterized in that the hardness of the prepared polyurethane elastomer is 65 ~ 100 (ASKER A).

The present invention uses a polyurethane elastomer (elastomeric polymer) that can be cured at room temperature and does not require a mold for molding an industrial roller. More specifically, the polyol and diisocyanate have an isocyanate content of 5 to 20%. Isocyanate terminal prepolymer and a polyol, a crosslinkable low molecular weight compound, a catalyst and an additive, characterized in that the mixture is prepared by mixing in an equivalence ratio.

 Looking at one example of the manufacturing process of the polyurethane elastomer of the present invention.

 First, the polyol to be used for the experiment was purified by distillation under reduced pressure at 100 to 110 ° C., and then the polyol and diisocyanate and the reaction catalyst were put in a five-necked flask equipped with a stirrer, a cooler, and a nitrogen injector, and the temperature was raised to 60 to 80 ° C. to obtain nitrogen. While stirring at a speed of 100 to 300rpm while reacting until the NCO content reaches the theoretical value to prepare an isocyanate terminal prepolymer. The curing agent was then placed in a five-necked separate flask equipped with a stirrer, a cooler, and a nitrogen injector with a diamine, a catalyst, and an additive containing a polyol and an aromatic compound distilled under reduced pressure at 100 to 110 ° C., and then heated to 60 to 80 ° C. to obtain nitrogen. It is prepared by mixing well for 1 to 2 hours at a speed of 200 ~ 300rpm while adding.

 Each component of such a polyurethane elastomer composition will be described in more detail as follows.

 The polyol used to prepare the polyurethane resin of the present invention may be a polyether-based polyol, a polyester-based polyol and the like, and the polyol used to prepare the isocyanate terminal prepolymer includes two or more hydroxy groups in a number average molecular weight in the range of 1,000 to 3,000. The polyol used for the hardening | curing agent is used individually or in combination, The thing containing two or more hydroxyl groups in the number average molecular weight of the range of 500-2,000 is used individually or in combination. When using a polyol having a molecular weight of less than 1,000 when preparing a prepolymer or a polyol having a molecular weight of less than 500 when preparing a curing agent, an elastomer that is too hard and inelastic is obtained, and a polyol having a molecular weight of 3,000 or more when preparing a prepolymer or a molecular weight when preparing a curing agent is obtained. In the case of using a polyol of 2,000 or more, the hardness of the prepared elastomer is low and the viscosity is high, resulting in poor workability.

 As the isocyanate used in the present invention, those having an aromatic group are used. Examples include toluene diisocyanate (TDI), 4,4'-diphenylmethane diisocyanate (MDI), xylene diisocyanate, naphthalene-1,5-diisocyanate (NDI) and the like. The isocyanate content of the isocyanate terminated prepolymer is suitably in the range of 5-20%. When the content of isocyanate is less than 5%, the overall physical properties including hardness decrease and the reaction rate is slow. When the isocyanate content exceeds 20%, the hardness of the polyurethane elastomer is It's improved, but it's too hard and breaks and the reaction rate is so difficult to control.

As a crosslinkable low molecular weight compound used for this invention, the diamine which has 2 functional groups which can react with an isocyanate, and an aromatic group is used, and 10-80 weight part is used with respect to 100 weight part of polyols. When the crosslinkable low molecular weight compound is used in less than 10 parts by weight, the hardness of the polyurethane elastomer is lowered. When the crosslinkable low molecular weight compound is used in excess of 80 parts by weight, the hardness is so high that the elastic force is lowered and broken. Such crosslinkable low molecular weight compounds include phenylenediamine, diethyltoluenediamine, dimethylthiotoluenediamine, and the like.

 The catalyst used in the synthesis of the polyurethane elastomer is 0.05 to 1.5 parts by weight based on 100 parts by weight of polyol and less than 0.05 parts by weight, the reaction rate is slow and may leave unreacted substances. Although the foaming speed is increased, low molecular weight oligomers are produced, which may lead to deterioration of mechanical properties. Examples of such catalysts include tertiary amines such as triethylenediamine, N, N-dimethylbenzylamine and N, N-dimethylethanolamine, acidic metal salts such as tin chloride and bismuth nitrate, dialkyltin dicarboxylates, and metals. Metal compounds such as octoate, and the like, and may be used alone or in combination.

  Other antifoaming agents, stabilizers, etc. can be used as additives. Antifoaming agents include polydimethylsiloxane, modified polydimethylsiloxane, and non-silicone polymer solutions, and can be used at 0.05 to 1.5 parts by weight based on the mixture. , Stabilizers include heat stabilizers, anti-aging agents, ultraviolet absorbers and the like can be used 0.05 ~ 2 parts by weight.

(Production example)

  100 parts by weight of polytetramethylene glycol (PTMG, molecular weight: 1,000), 70 parts by weight of polytetramethylene glycol (PTMG, molecular weight: 2,000) in a five-necked separate flask equipped with a stirrer, a cooler and a nitrogen injector, methylene diphenyl diisocyanate 250 After the addition of 0.1 parts by weight of dibutyl tin dilaurate, the temperature was raised to 80 ° C., and nitrogen was added thereto, the reaction mixture was stirred at a speed of 200 rpm until the NCO content reached the theoretical value, thereby preparing an isocyanate terminal prepolymer. Then, 100 parts by weight of polytetramethylene glycol (PTMG, molecular weight: 1,000), 100 parts by weight of diethyltoluenediamine, and 0.1 parts by weight of dibutyltin dilaurate were placed in a 5-necked separate flask equipped with a stirrer, a cooler, and a nitrogen injector, followed by 80 Mixing well for 2 hours at a rate of 200rpm while introducing nitrogen at a temperature of ℃ to prepare a curing agent to react with the isocyanate terminal prepolymer. The isocyanate terminated prepolymer and the curing agent were mixed in a ratio of 100: 70 and aged at room temperature for 5 days to prepare a cast polyurethane elastomer.

The compounding table of the materials used in the above process is as shown in Table 1, the physical properties are shown in Table 2.

Table 1. Formulation Table

ingredient
Production Example Isocyanate Terminated Prepolymer


Polytetramethylene Glycol (Molecular Weight: 1,000) 100 Polytetramethylene glycol
(Molecular weight: 2,000) 70 Methylenediphenyl
Diisocyanate 250 Dibutyl tin dilaurate 0.1 Hardener

Polytetramethylene Glycol (Molecular Weight: 1,000) 100 Diethyltoluenediamine 10 Dibutyl tin dilaurate 0.1

Table 2. Physical Properties

characteristic Production Example Hardness (A type, 23 ℃) 75 Tensile strength (kgf / cm ² ) 250 Elongation (%) 500 Resilience (%) 70 Wear resistance (%) 30

-Isocyanate terminal prepolymer: curing agent reaction ratio = 100: 70

It will be described how to coat the polyurethane using the material as described above.

First, the material is prepared in a storage tank, and the metal core is fixed to the jig.

At this time, the storage tank should be able to maintain 20-30 degrees for isocyanate, 60-80 degrees for the resin tank.

Next, the material mixed in the injection unit is injected onto the outer circumferential surface of the core while rotating the core at a constant speed using the drive unit.

In this process, the rotational speed of the core is stored at 10-60rpm, the injection amount discharged from the injection unit is up to 1.8Kg / min, it is preferable that the rotational speed of the impeller is controlled to 3,000 ~ 6,000rpm.

In addition, the separation distance between the injection portion and the outer peripheral surface of the core is adjusted to about 50-100mm, the thickness of the coating is to be about 5 ~ 10mm per revolution.

In particular, it is preferable that the injection angle of the injection portion is maintained at an angle of 45 degrees to 60 degrees in front of the upper part of the core (when rotating clockwise, in the 9 o'clock direction).

When the polyurethane is coated on the outer circumferential surface through the above process, the outer circumferential surface of the core can be completed as a whole while moving the moving part horizontally.

As described above, it can be seen that the present invention has a basic technical idea to provide a polyurethane coating device for a roller that can be manufactured at room temperature without using a mold using a room temperature-curable polyurethane material. Of course, many other variations are possible to those skilled in the art.

1 is a front view showing a polyurethane coating device for a roller according to an embodiment of the present invention.

2 is a side view of FIG. 1;

3 is a plan view of FIG.

4 is a conceptual diagram showing an injection unit according to an embodiment of the present invention.

5 is a conceptual diagram illustrating a mixing head unit according to an embodiment of the present invention.

<Explanation of symbols for main parts of drawing>

1: metal core

10: frame

12: rail

20a, 20b: jig

30: drive unit

50: mixing head

52: housing

54: drive motor

56: impeller

58: inlet

60: spray part

70: moving part

Claims (5)

A frame; A jig installed on both sides of the frame to fix a metal core horizontally; A driving unit coupled to one side of the jig to rotate the metal core; A storage tank in which a main body and a hardener are respectively stored; A mixing head portion in which a main material and a curing agent supplied from the storage tank are mixed; An injection unit coupled to the mixing head to inject a main body and a hardener to an outer circumferential surface of the metal core; A moving part fixed to the mixing head part and horizontally moved along a rail installed horizontally in the frame; The polyurethane coating device for a roller, characterized in that consisting of; control unit for controlling the injection amount of the main body and the curing agent injected from the injection unit and the drive unit and the moving unit. The method of claim 1, The injection unit, Polyurethane coating device for rollers, characterized in that the inner cross-section is continuously changed from circular to rectangular, each cross-sectional area is the same. The method of claim 1, The mixing head portion, A housing; A drive motor installed above the housing; An impeller installed inside the housing and rotating through the driving motor; It comprises a; injection port coupled to the connection pipe connected to the storage tank; The polyurethane coating device for rollers, characterized in that the main body and the curing agent introduced through the injection port is mixed and discharged to the injection unit. The method of claim 1, In the moving unit, Polyurethane coating device for a roller, characterized in that it further comprises a vertical moving portion for vertically moving the mixing head portion and the injection portion. The method of claim 1, The main subject is an isocyanate terminal prepolymer prepared by the reaction of a polyol having a molecular weight of 1,000 to 3,000 with a diisocyanate having an aromatic group and having an isocyanate content of 5 to 20% and a viscosity of 500 to 4,000 (at 50 ° C), The curing agent is composed of 10 to 80 parts by weight of diamine having an aromatic group, 100 to 5 parts by weight of polyol having a molecular weight of 500 to 2,000, 0.05 to 1.5 parts by weight of catalyst, and 0.05 to 2 parts by weight of additive, and has a viscosity of 50 to 1,000 (at 25 ° C), The main body and the curing agent, characterized in that used in the same equivalence ratio and the polyurethane coating device for a roller, characterized in that the hardness of the prepared polyurethane elastomer is 65 ~ 100 (ASKER A).

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