KR20220020588A - Silicone Extrudate Coating System and Coating Method - Google Patents

Abstract

The present invention relates to a silicone extrudate coating system, which comprises: a coating part in which a siloxane coating solution for coating a surface of a silicone extrudate supplied from the outside is accommodated; a guide roller provided on one side of the coating part to control a path of the silicone extrudate so that the silicone extrudate is stably immersed in the coating part; an absorption part provided on one side adjacent to the coating part to control the amount of coating of the coating solution coating the surface of the silicone extrudate; and a drying part provided on one side of the coating part to dry the coating solution of the coated silicone extrudate passing through the absorption part. The absorption part controls so that 1 ml to 3 ml of the coating solution is used for coating per surface unit area (1cm^2) of the silicone extrudate, and the internal drying temperature of the drying part for drying the coated silicone extrudate is at 160℃ to 180℃. The coated silicone extrudate passes through the drying part at a speed of 0.2 m/min to 1.0 m/min. The present invention uniforms coating thickness and forms a beautiful surface by controlling process conditions for coating a surface of the silicone extrudate and the coating amount of the surface coating agent.

Description

Silicone Extrudate Coating System and Coating Method

The present invention relates to a silicone extrudate coating system and a coating method, and more particularly, by controlling the process conditions and the coating amount of the surface coating agent for coating on the surface of the silicone extrudate to make the coating thickness uniform, and to form a beautiful surface. To a silicone extrudate coating system and coating method.

In extrusion molding, a liquid resin obtained by heating a polymer or thermoplastic resin in powder state above its melting point or softening point is usually extruded in the die direction using a plunger to make a molded article of a certain shape, and then cooled , refers to a method of continuously forming products by solidifying them. Articles manufactured by this method are called extruded shapes or extruded products.

As a representative method that can be suggested as a method for coating the surface of a silicone extrudate manufactured by extrusion molding as described above, spray coating, roll coating, dip coating, etc. are known. .

Spray coating is a method of coating the coating solution by high-pressure spraying on the silicone extrudate using a spray gun. This spray coating has the advantage that both single-sided coating and multi-sided coating are possible. However, in order to coat only the desired area, it is necessary to mask the uncoated area, and due to the spray method, the amount of the coating solution dispersed around the silicone extrudate is larger than the amount coated on the silicone extrudate. In addition, since the coating solution for spraying must have a relatively low viscosity, a diluent must be added, and since a process of evaporating the diluent in a subsequent process is additionally required, there is a problem in that the number of working steps is increased.

Roll coating is a method of coating while rolling the coating roll with the coating solution on the silicone extrudate. This roll coating can be usefully used for a two-dimensional flat product, but there is a limit that it cannot precisely coat a narrow part or a thin surface due to the nature of using a coating roll, and because of this, the shape is complicated, There is a problem in that it is not easy to coat a product having a three-dimensional shape having irregularities.

Dip coating is a coating method for forming a coating film by immersing the silicone extrudate in a solution in which the material forming the coating film is dissolved or dispersed, and then taking it out. This dip coating has a problem in that it is not easy to coat the silicone extrudate with a uniform thickness as a whole due to the process of taking out the silicone extrudate after immersing the silicone extrudate in the coating solution.

KR 0643754 10

The present invention is to solve the problems of the prior art, by controlling the process conditions for coating the surface of the silicone extrudate and the coating amount of the surface coating agent to make the coating thickness uniform, and a silicone extrudate coating system capable of forming a beautiful surface and to provide a coating method.

The object of the present invention is not limited thereto, and other objects not mentioned will be clearly understood by those skilled in the art from the following description.

The silicone extrudate coating system for achieving the object of the present invention as described above is provided on one side of the coating part containing the siloxane coating solution for coating the surface of the silicone extrudate supplied from the outside, and the silicone extrudate is provided on one side of the coating part. A guide roller for controlling the path of the silicone extrudate so as to be stably immersed in the coating unit, an absorption unit provided on one side adjacent to the coating unit to control the amount of coating solution coated on the surface of the silicone extrudate, and the coating unit It is provided on one side and includes a drying unit for drying the coating liquid of the coated silicone extrudate that has passed through the absorption unit, and the absorption unit is controlled to coat 1 ml to 3 ml of the coating solution per unit surface area (1 cm ² ) of the silicone extrudate, An internal drying temperature of the drying unit is 160° C. to 180° C. to dry the coated silicone extrudate, and the coated silicone extrudate passes through the drying unit at a speed of 0.2 m/min to 1.0 m/min.

In this case, the siloxane coating solution may be octamethylcyclotetrasiloxane.

In addition, the drying unit may further include a conveying roller for moving the coated silicone extrudate so that the coated silicone extrudate can pass through the inside of the drying unit.

In another category, the silicone extrudate coating method is an immersion step in which the silicone extrudate supplied from the extruder is supplied at a speed of 0.2 m/min to 1.0 m/min and is immersed in a siloxane coating solution, the silicone extrudate surface is coated, coated silicone extrusion A coating solution control step of controlling the capacity of the coating solution so that the coating solution of water can be coated at 1 ml to 3 ml per unit area (1 cm ² ), and a drying step of drying the coated silicone extrudate at 160° C. to 180° C. for 4 minutes or more do.

The silicone extrudate coating system and coating method of the present invention have the following effects.

First, there is an effect that it is possible to easily coat the silicone extrudate through a simple structure.

Second, since the injected silicone extrudate is introduced into the coating part by its own weight without a separate induction device, it is possible to reduce the volume and weight of the system.

Third, the coating and drying time can be easily controlled through the rollers provided in the coating unit and the drying unit, so that the user can coat in a desired state.

Fourth, it is possible to obtain a coated silicone extrudate having a uniform coating state over the entire surface of the silicone extrudate by controlling the coating liquid on the surface of the silicone extrudate that has passed through the coating unit through the absorption unit.

Fifth, since most of the silicone extrudate moves vertically, shaking is minimized during the movement of the silicone extrudate, thereby achieving a stable coating.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

The following drawings attached to this specification illustrate preferred embodiments of the present invention, and serve to further understand the technical spirit of the present invention together with the detailed description of the present invention, so the present invention is limited only to the matters described in those drawings should not be interpreted as
1 is a schematic cross-sectional view of a silicone extrudate coating system according to the present invention;
2 is a schematic cross-sectional view according to another embodiment of the use of the silicone extrudate coating system according to the present invention; and
3 is a flowchart sequentially showing a method for coating a silicone extrudate according to the present invention.

Advantages and features of the present invention and methods of achieving them will become apparent with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only those of ordinary skill in the art to which the present invention pertains, to complete the disclosure of the present invention. It is provided to fully understand the scope of the present invention, and the present invention is only defined by the scope of the claims.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and/or “comprising” does not exclude the presence or addition of one or more other components in addition to the stated components. Like reference numerals refer to like elements throughout, and "and/or" includes each and every combination of one or more of the recited elements. Although "first", "second", etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component. Accordingly, it goes without saying that the first component mentioned below may be the second component within the technical spirit of the present invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with meanings commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless specifically defined explicitly.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Construction of silicone extrudate coating system

1 is a schematic cross-sectional view of a silicone extrudate coating system according to the present invention. The silicone extrudate coating system 10 according to the present invention is an apparatus for coating the silicone extrudate 1000 supplied from the outside. At this time, the silicone extrudate coating system 10 may be provided on one side of the extrusion device for extrusion molding the silicone extrudate 1000 so as to receive the silicone extrudate 1000 molded in the extrusion device directly. Of course, depending on the mode of use, the extrusion-molded silicone extrudate 1000 may be delivered and used through a transfer device. As shown in FIG. 1, the silicone extrudate coating system 10 is largely an input unit 100, a coating unit 200, a guide roller 300, an absorption unit 400, a drying unit 500, and a return unit. It includes a roller 600 .

The input unit 100 is a device for supplying the silicone extrudate 1000 . Any device may be used as the input unit 100 as long as it is a device capable of stably transporting the silicone extrudate 1000, such as a conveyor belt. Depending on the mode of use, the extrusion device itself may be used as the input unit 100 .

The coating part 200 is provided on one side adjacent to the input part 100 and provides a space in which the coating solution 210 for dip coating the silicone extrudate 1000 supplied from the input part 100 is accommodated in an immersion method. it is a device At this time, the coating part 200 is relatively relatively compared to the input part 100 so that the silicone extrudate 1000 input from the input part 100 can be introduced into the coating part 200 by its own weight without a separate operation. It is better to place it in a lower position. As such, as the coating part 200 is provided at the lower part of the input part 100, the silicone extrudate 1000 input from the input part 100 is bent downward by its own weight and the coating part 200 without a separate device or operation. ) is easily introduced into

Various coating agents may be selectively used in the coating solution 210 accommodated in the coating part 200 to coat the silicone extrudate 1000 . However, it is preferable to use a siloxane coating solution, and more preferably use an octamethylcyclotetrasiloxane coating solution. The silicone extrudate before coating the siloxane coating solution has adhesiveness on the surface due to the characteristics of the silicone product, so a sticky feel remains, and even if the surface dries over time, the surface adhesiveness remains without disappearing, There are many cases that require non-adhesiveness depending on the type. Accordingly, there is a need to improve the soft feel and slippery properties of the surface by coating a siloxane coating solution on the surface of the silicone extrudate in order to reduce the adhesion of the surface. However, when the siloxane coating solution is coated, there are problems such as peeling off and cracking of the coating layer or the occurrence of scratches on the coating surface depending on an appropriate coating amount and drying conditions of the coating layer.

Figure 2 is a schematic cross-sectional view according to another embodiment of the use of the silicone extrudate coating system according to the present invention. The guide roller 300 is provided on one side of the coating part 200, preferably on one side of the inside of the coating part 200, so that the silicone extrudate 1000 flowing into the coating part 200 is stably immersed after coating. It is a device that provides a path so that it can be discharged to the outside. For this purpose, the guide roller 300 is preferably provided on one side of the inner side of the coating unit 200 corresponding to the inflow path of the silicone extrudate 1000 introduced by its own weight from the input unit 100 . In the present invention, as shown in FIG. 1 , it is mainly described that one guide roller 300 is provided, but the usage mode, the installation environment, the inner area of the coating part 200 , and the silicone extrudate 1000 of the As shown in FIG. 2 in consideration of the immersion time and the like, two or more guide rollers 300 may be provided. The guide roller 300 is preferably disposed so as to be vertically movable so as to minimize shaking when the silicone extrudate 1000 is moved.

The absorbent part 400 is provided on the inner side of the coating part 200 or on the upper side adjacent to the coating part 200 to absorb a part of the coating solution 210 coated on the surface of the silicone extrudate 1000 to absorb a portion of the silicone extrudate ( 1000), it is a device that controls so that only an appropriate coating solution 210 remains on the surface of the silicone extrudate 1000 and has a uniform coating thickness throughout. The absorbing part 400 is provided between the first absorbing unit 410 and the first absorbing unit 410 and the silicone extrudate 1000 having good absorption to make the coated surface of the silicone extrudate 1000 beautiful. Compared to the first absorption unit 410, the second absorption unit 420 having a relatively finer surface may be included. At this time, the absorber 400 is preferably coated with the coating solution 210 of 1ml to 3ml per surface unit area (1cm ² ) of the silicone extrudate 1000 .

In addition, as shown in FIG. 2 , in the absorption unit 400 according to the usage mode, the first absorption unit 410 and the second absorption unit 420 are sequentially disposed along the moving direction of the silicone extrudate 1000 . can be That is, after absorbing a certain amount of the coating solution 210 by being disposed at a position preceding the silicone extrudate 1000 in the traveling direction, the second absorption unit 420 can smooth the surface of the coating solution 210 . The first absorption unit 410 and the second absorption unit 420 may be separately disposed. Although the present invention has been described as sequentially disposing of two absorption units having different particles, three or more absorption units having gradually fine surface particles may be disposed depending on the usage mode.

The drying unit 500 is a device for drying the coating liquid 210 adhered to the surface of the silicone extrudate 1000 through the coating unit 200 and the absorption unit 400 . The drying unit 500 is the upper portion of the coating unit 200, preferably at a position corresponding to one side of the coating unit 200 provided with the absorption unit 400, spaced apart from the upper portion of the coating unit 200 by a predetermined interval. placed in position At this time, the drying unit 500 may have an inlet 510 and a nipple 520 formed on one side so as to be discharged after drying of the silicone extrudate 1000 supplied from the lower portion. The inlet 510 is preferably formed on the lower surface of the drying unit 500 in consideration of the input direction of the coated silicone extrudate 1000 flowing in from the bottom, and the nipple 520 is preferably formed on the lower surface or the side surface. Do. It is preferable to maintain the internal temperature of the drying unit 500 at 160° C. to 180° C. in order to smoothly dry the coating liquid 210 on the surface of the silicone extrudate 1000 passing through the drying unit 500 . Any heating device may be used as long as the internal temperature can be maintained.

The conveying roller 600 is provided on one side of the inside of the drying unit 500 to provide a path so that the coated silicone extrudate 1000 flowing into the drying unit 500 can be stably dried and then discharged. In the present invention, as shown in FIG. 1, although it has been mainly described that a single conveying roller 600 is provided, the usage mode, the installation environment, the internal area of the drying unit 500, the coated silicone extrudate 1000 ) in consideration of the drying time, etc., as shown in FIG. 2 , two or more conveying rollers 600 may be provided.

At least one side of the guide roller 300 or the conveying roller 600 is provided with a motor (not shown) that transmits power for rotating the guide roller 300 or the conveying roller 600 . The motor rotates the guide roller 300 and the conveying roller 600 so that the guide roller 300 and the conveying roller 600 move the silicone extrudate 1000 at a speed of 0.2 m/min to 1.0 m/mim. to control

Silicone Extrusion Coating Method

In the present invention, the silicone extrudate 1000 coating method is mainly described using the silicone extrudate coating system 10 having the above-described configuration, but this is only for convenience of explanation and the same method using any other device It is self-evident that when using a silicone extrudate coating method corresponding to the present invention can be recognized.

3 is a flowchart sequentially showing a method for coating a silicone extrudate according to the present invention. First, the silicone extrudate 1000 is introduced into the coating unit 200 through the input unit 100 such as a conveyor belt or an extrusion molding machine (S100). At this time, since the silicone extrudate 1000 is disposed on the coating part 200 , it can be naturally introduced into the coating part 200 by the weight of the silicone extrudate 1000 even if there is no separate input unit.

Next, the silicone extrudate 1000 introduced into the coating part 200 passes through the coating part 200 and is coated by the coating solution 210 accommodated in the coating part 200 (S200). In this case, the coating solution 210 accommodated in the coating unit 200 may be a siloxane coating solution 210 , preferably an octamethylcyclotetrasiloxane coating solution 210 . In addition, since the coating part 200 is formed in a tank type for a dip coating method, there is no fear that the silicone extrudate 1000 is released into the coating part 200 to the outside, and the coating is made stably.

Here, the silicone extrudate 1000 flowing into the coating unit 200 is stably moved along a predetermined path through the guide roller 300 . The number and rotation speed of the guide roller 300 may be adjusted in consideration of the inner area of the coating unit 200 and the immersion time of the silicone extrudate 1000 . That is, as shown in FIGS. 1 and 2 according to the usage aspect, the number of guide rollers 300 can be adjusted, and when the guide rollers 300 have the same rotation speed, the silicone extrudate 1000 passes through As the number of guide rollers 300 increases, the time spent inside the coating part 200 increases. As another method, by controlling the rotation speed of the guide roller 300 through a motor, it is possible to adjust the time for which the silicone extrudate 1000 is immersed in the interior of the coating unit 200 . As such, the time during which the silicone extrudate 1000 is immersed in the coating part 200 can be controlled through various methods. Preferably, the silicone extrudate 1000 is preferably rotated by the guide roller 300 at a speed of 0.2 m/min to 1.0 m/min.

Next, the coating solution 210 coated so that the coating solution 210 buried on the outside of the silicone extrudate 1000 discharged to the outside of the coating unit 200 can be coated on the entire area of the silicone extrudate 1000 with an even thickness. ) to control the capacity (S300). As such, if the coating solution 210 passed through the coating unit 200 and adhered to the surface of the silicone extrudate 1000 can be formed with a uniform thickness over the entire area of the silicone extrudate 1000, any method and device can be used. is also free

In the present invention, it is possible to absorb the coating solution 210 of a predetermined capacity by the user through the absorption unit 400 so that it can be formed on the surface of the silicone extrudate (1000). However, this is only according to an embodiment, and if the coating solution 210 can be uniformly formed on the surface of the silicone extrudate 1000 by using another method, the method is not limited. At this time, the absorber 400 is preferably coated with the coating solution 210 of 1ml to 3ml per surface unit area (1cm ² ) of the silicone extrudate 1000 .

Finally, the coating solution 210 formed on the surface of the silicone extrudate 1000 is dried and cured to finish the coating process (S400). In the coating finishing step ( S400 ), any method and apparatus may be used as long as the curing condition of the coating solution 210 desired by the user can be satisfied.

In one embodiment, the silicone extrudate 1000 having the coating solution 210 formed thereon passes through the high-temperature drying unit 500 for a predetermined period of time to perform curing. In this case, the internal drying temperature of the drying unit 500 is 160° C. to 180° C., preferably, it is preferable to dry the drying unit 500 at a temperature of about 170° C. for 4 minutes or more. At this time, the drying time of the coated silicone extrudate 1000 passing through the drying unit 500 may be controlled through the number and rotation speed of the conveying rollers 600 provided in the drying unit 500 . That is, when the rotation speed of the conveying roller 600 is constant, as shown in FIG. 1 , when the conveying roller 600 passes through two conveying rollers 600 compared to one conveying roller 600, the coated silicone pressurized material is The residence time inside the drying unit 500 is increased, and depending on the usage mode, three or more conveying rollers 600 may be disposed in a complex manner to increase the residence time.

As another method, the time spent in the drying unit 500 may be adjusted by adjusting the rotation speed of the conveying roller 600 using a motor. At this time, it is preferable to rotate the feeding roller 600 for the silicone extrudate 1000 at a speed of 0.2 m/min to 1.0 m/min.

In addition, depending on the mode of use, by mixing the two methods, the residence time in the drying unit 500 can be adjusted.

Hereinafter, the silicone extrudate coating system and coating method of the present invention will be described in more detail through examples.

The silicone rubber product is extruded and molded through an extruder, and the molded silicone extrudate is supplied at a constant speed and immersed in the coating section containing the siloxane coating solution, and the silicone extrudate coated with the coating solution is immediately moved to the drying section and dried to make the final final product. A coated silicone rubber product was obtained.

Drying temperature (℃) Movement speed (m/min) hours (minutes) Coating solution (ml/cm ² ) Example 1 160 0.2 20 2.0 Example 2 175 1.0 4 2.0 Example 3 180 0.5 8 1.5 Comparative Example 1 155 1.0 4 5.5 Comparative Example 2 190 1.0 4 4.0 Comparative Example 3 175 1.0 2 3.0

The results of observing the surface of the final silicone rubber product by coating the silicone extrudate according to the conditions of Table 1 are shown in Table 2 below. Defects on the coating surface were visually observed, and FE-SEM (TESCAN:MAIA3) was used for the thickness of the coating layer.

coating surface defects Coating layer thickness (㎛) Example 1 does not exist 3.9 Example 2 does not exist 5.5 Example 3 does not exist 4.3 Comparative Example 1 Scratch Occurrence 1.2 Comparative Example 2 coated surface crack 13.0 Comparative Example 3 peel off coating 8.4

In the case of Examples 1 to 3, after immersion in the siloxane coating solution, coating surface defects were prevented through application of an appropriate coating solution, an optimum drying temperature, and a drying time and speed, and 3-7 μm was obtained as an appropriate coating layer thickness. When the thickness of the coating layer is less than 3 μm, there is a problem that a soft touch cannot be obtained according to the siloxane coating layer coating and the adhesiveness of the surface of the existing silicone extrudate is maintained. This can be covered to obtain a soft feel and slippery properties of the surface of the coating layer, but there is a problem of a decrease in flexibility due to an increase in the coating thickness.

However, in the case of Comparative Example 1, the drying temperature was lower than 160 ° C. and insufficient drying was achieved, and it was observed that the coating texture was scratched on the coating surface due to excessive application of the coating solution, and in Comparative Example 2, excessively Cracks occurred on the coating surface due to the high drying temperature, and the coating layer was formed too thick at 13.0 μm due to excessive application of the coating solution. there was

As described above, those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential characteristics thereof. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention.

10: silicone extrudate coating system
100: input
200: coating part
210: coating solution
300: guide roller
400: absorption unit
410: first absorption unit
420: second absorption unit
500: drying unit
510: inlet
520: outlet
600: feeding roller
1000: silicone extrudate

Claims (4)

a coating unit in which a siloxane coating solution for coating the surface of the silicone extrudate supplied from the outside is accommodated;
a guide roller provided on one side of the coating part to control the path of the silicone extrudate so that the silicone extrudate is stably immersed in the coating part;
an absorption unit provided on one side adjacent to the coating unit to control the amount of coating solution coated on the surface of the silicone extrudate; and
a drying unit provided on one side of the coating unit to dry the coating solution of the coated silicone extrudate that has passed through the absorption unit;
including,
The absorption unit controls the coating solution to be coated in an amount of 1 ml to 3 ml per surface unit area (1 cm ² ) of the silicone extrudate,
The internal drying temperature of the drying unit is to dry the coated silicone extrudate at 160°C to 180°C,
The silicone extrudate coating system in which the coated silicone extrudate passes through the drying section at a speed of 0.2 m/min to 1.0 m/min. According to claim 1,
The silicone extrudate coating system, characterized in that the siloxane coating solution is octamethylcyclotetrasiloxane. According to claim 1,
The silicone extrudate coating system further comprising a conveying roller for moving the coated silicone extrudate so that the drying unit can pass the coated silicone extrudate through the inside of the drying unit. An immersion step in which the silicone extrudate supplied from the extruder is supplied at a rate of 0.2 m/min to 1.0 m/min and is immersed in a siloxane coating solution;
A coating solution control step of controlling the capacity of the coating solution so that the coating solution of the silicone extrudate coated on the surface of the silicone extrudate can be coated in 1 ml to 3 ml per unit area (1 cm ² ); and
a drying step of drying the coated silicone extrudate at 160° C. to 180° C. for 4 minutes or more;
A silicone extrudate coating method comprising a.

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