Resin polymerization reaction apparatus and resin discharge method

Abstract

A resin polymerization reaction apparatus according to an embodiment of the present invention preferably includes a reactor in which a resin is accommodated and a resin polymerization reaction is carried out; an agitator installed inside the reactor for agitating the resin; and a discharge port located at a lower portion of the reactor and having a plurality of discharge openings each having an opening diameter within a range of 3 / 80 to 10 / 80 of the diameter of the discharge port.

Description

Technical Field

[0001] Technical Field The present application relates to a resin polymerization reactor and a resin discharge method. Specifically, by increasing the discharge temperature of the resin through temperature control of the reactor to lower the viscosity of the resin, the discharge speed of the resin is increased, and the discharge area is adjusted through a perforated plate to improve the discharge efficiency of the resin. The present application relates to a resin polymerization reactor and a resin discharge method capable of doing so.

[0002] The present application claims the benefit of priority based on Korean Patent Application No. 10-2021-0141469, filed on October 22, 2021, and all the contents disclosed in the corresponding Korean patent application are incorporated herein by reference.

Background Art

[0003] Generally, after a resin is introduced into a polymerization reactor together with a monomer and an initiator, it is discharged from the polymerization reactor in a state having viscosity after undergoing a polymerization reaction. After completion of the polymerization reaction, in order to discharge the resin from the polymerization reactor, nitrogen gas is injected into the upper part of the polymerization reactor.

[0004] The resin in the polymerization reactor 10 is discharged from the discharge port by the force pressurized by the nitrogen gas. At this time, the discharge speed of the resin varies depending on the discharge area of the discharge port 11. The discharge speed of the resin becomes faster as the discharge area of the discharge port is wider.

[0005] If the discharge speed of the resin is faster than the speed at which the nitrogen gas moves from the upper part to the lower part of the polymerization reactor, a situation occurs where the resin is discharged to the outside through the discharge port before the nitrogen gas reaches the lower part of the polymerization reactor. As a result, the resin that has not yet been discharged remains in the lower part of the polymerization reactor.

[0006] Also, if the discharge area of the discharge port 11 in the polymerization reactor 10 is narrow, the discharge speed of the resin becomes slow, and as a result, a problem occurs in that the resin solidifies around the discharge port and blocks the discharge port.

Summary of the Invention

Problems to be Solved by the Invention

[0007] This application aims to provide a resin polymerization reaction apparatus and a resin discharge method that can increase the discharge rate of the resin by increasing the discharge temperature of the resin through temperature control of the reactor to lower the viscosity of the resin, and improve the discharge efficiency of the resin by adjusting the discharge area through a perforated plate.

Means for Solving the Problems

[0008] The resin polymerization reaction apparatus according to an embodiment of the present invention preferably includes a reactor in which a resin is accommodated and a resin polymerization reaction is carried out; a stirring unit installed inside the reactor to stir the resin; and a discharge port located at the lower part of the reactor and including a plurality of discharge openings having an opening diameter within the range of 3 / 80 to 10 / 80 of the diameter of the discharge port.

[0009] In one embodiment of the present invention, the plurality of discharge openings preferably have the same diameter.

[0010] In one embodiment of the present invention, the plurality of discharge openings are preferably arranged at intervals along the circumferential direction of a virtual concentric circle having a predetermined radius with the center of the discharge port as a reference.

[0011] In one embodiment of the present invention, the virtual concentric circle preferably has a diameter within the range of 1 / 4 to 5 / 7 of the diameter of the discharge port.

[0012] In one embodiment of the present invention, the plurality of discharge openings are preferably arranged radially at intervals with the center of the discharge port as a reference.

[0013] In one embodiment of the present invention, it preferably further includes at least one perforated plate on which a plurality of discharge openings are formed and which is detachably coupled to the discharge port.

[0014] In one embodiment of the present invention, the perforated plate is preferably formed such that a plurality of discharge openings have the same diameter within the range of the opening diameter, and the range of the opening diameter is preferably within the range of 3 / 80 to 10 / 80 of the diameter of the discharge port.

[0015] In one embodiment of the present invention, the reactor is preferably temperature-controlled such that the preheating temperature of the resin discharge is higher than the polymerization reaction temperature of the resin.

[0016] In one embodiment of the present invention, after completion of the polymerization reaction of the resin, the reactor preferably heats the resin to the preheating temperature for discharge.

[0017] In one embodiment of the present invention, the preheating temperature for discharge is preferably a temperature that is 20 to 50 degrees higher than the polymerization reaction temperature.

[0018] In one embodiment of the present invention, the preheating temperature for discharge is preferably a temperature that is 30 degrees higher than the polymerization reaction temperature.

[0019] In one embodiment of the present invention, the stirring unit preferably includes a stirring rod installed inside the reactor in the resin discharge direction; a stirring motor that provides a rotational force to the stirring rod; an upper support base installed above the stirring rod so as to be perpendicular to the discharge direction; a lower support base installed below the stirring rod alongside the upper support base; and stirring blades coupled to the upper support base and the lower support base in a double helix structure.

[0020] In one embodiment of the present invention, the stirring blades preferably include a first stirring blade having a spiral structure, with its upper end coupled to one end of the upper support base and its lower end coupled to one end of the lower support base; and a second stirring blade having a spiral structure, with its upper end coupled to the other end of the upper support base and its lower end coupled to the other end of the lower support base.

[0021] In one embodiment of the present invention, it is more preferable that the stirring unit further includes lower blades that are inclined downward from the tip of the lower support base toward the discharge direction.

[0022] In one embodiment of the present invention, the lower blade preferably includes a first lower blade extending from the lower end of the first stirring blade to the lower part of the lower support base, the first lower blade inclined downward in the discharge direction from one end of the lower support base toward the rotation axis of the stirring rod; and a second lower blade extending from the lower end of the second stirring blade to the lower part of the lower support base, the second lower blade inclined downward in the discharge direction from the other end of the lower support base toward the rotation axis of the stirring rod.

[0023] In one embodiment of the present invention, the first lower blade and the second lower blade have a triangular cross section, and are preferably formed symmetrically with respect to the rotation axis of the stirring rod.

[0024] In one embodiment of the present invention, the first lower blade and the second lower blade are symmetrical about the rotation axis of the stirring rod, and are preferably spaced apart by a distance greater than the diameter of the discharge port.

[0025] In one embodiment of the present invention, the lower blade is preferably positioned in the funnel portion of the reactor and has a structure inclined downward from the tip of the lower support at an inclination corresponding to the inclined surface of the funnel portion.

[0026] In one embodiment of the present invention, it is preferable that the stirring unit has a stirring blade and a lower blade that rotate in the rotation direction of the stirring rod, with the stirring blade stirring the resin present in the upper part of the funnel and the lower blade stirring the resin present in the funnel.

[0027] The resin polymerization reaction apparatus according to an embodiment of the present invention further includes a gas injector for injecting a gas from the top of the reactor, and the gas preferably pressurizes the resin at a predetermined pressure so that the resin moves toward the discharge port.

[0028] In one embodiment of the present invention, the diameter of the discharge opening is preferably within the range of 1 / 16 to 1 / 8 of the diameter of the discharge port.

[0029] In one embodiment of the present invention, the diameter of the discharge opening is preferably within the range of 1 / 16 to 1 / 10 of the diameter of the discharge port.

[0030] In one embodiment of the present invention, it is preferable that the diameter of the discharge opening is within the range of 3 / 80 to 1 / 10 of the diameter of the discharge port.

[0031] On the other hand, in the resin discharge method according to one embodiment of the present invention, it is preferable to perform a resin polymerization reaction in a reactor using a resin polymerization reaction apparatus and discharge the resin from the reactor after the resin polymerization reaction.

Effects of the Invention

[0032] The present invention can increase the discharge rate of the resin by increasing the discharge temperature of the resin through temperature control of the reactor to lower the viscosity of the resin, and thus can derive the effect of shortening the discharge time of the resin.

[0033] The present invention can adjust the discharge amount and discharge rate of the resin by adjusting the discharge area of the resin through a perforated plate.

[0034] In addition, since the present invention can adjust the thickness of the biodegradable resin according to the requirements of the pelletizing process that proceeds after the polymerization step through the alternation of the perforated plates, the efficiency of the overall process progress can be improved.

Brief Description of the Drawings

[0035]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Best Mode for Carrying Out the Invention

[0036] The present invention can have various embodiments with various modifications added thereto, and specific embodiments are illustrated and described with reference to the drawings.

[0037] However, this is not intended to limit the present application to specific embodiments, and it should be understood to include all modifications, equivalents, and alternatives included in the spirit and technical scope of the present application. In explaining the present application, when it is determined that a specific description of related known technologies may obscure the gist of the present application, the detailed description thereof will be omitted.

[0038] Terms such as first and second can be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

[0039] The terms used in the present application are used only for explaining specific embodiments and are not intended to limit the present application. Singular expressions include plural expressions unless the context clearly indicates otherwise.

[0040] In this application, terms such as "comprising" or "having" are intended to specify the presence of the features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and should not be construed as precluding the presence or possibility of addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0041] Therefore, the configurations illustrated in the embodiments described in this specification are merely the most preferred embodiments of this application and do not represent all of the technical ideas of this application. At the time of this application, there may be various equivalents and modifications that can replace them. Also, the drawings attached to this application should be understood to be illustrated with enlargement or reduction for the convenience of explanation.

[0042] Hereinafter, with reference to the accompanying drawings, a resin polymerization reactor and a resin discharge method according to preferred embodiments of the present invention will be described.

[0043] The present invention has been developed to polymerize a biodegradable resin and improve the discharge amount of the biodegradable resin after the polymerization reaction is completed.

[0044] A biodegradable resin is a resin that is easily decomposed by biological actions such as microorganisms. Examples of biodegradable resins include polylactic acid (PLA, Poly Lactic Acid), polybutylene adipate terephthalate (PBAT, Poly(butylene adipate-co-terephthalate)), poly lactic acid hydroacrylate (PLH, Poly Lactate Hydracrylate), and the like.

[0045] Here, polylactic acid (PLA, Poly Lactic Acid) and PLH are environmentally friendly resins made from raw materials extracted from corn starch, which have characteristics equivalent to those of general plastics during use, but are 100% biodegradable by microorganisms when discarded.

[0046] The biodegradable resin is charged into a polymerization reactor together with a monomer and an initiator, and after undergoing a polymerization reaction, it is discharged from the polymerization reactor in a state having viscosity.

[0047] Figure 2 is a configuration diagram of a resin polymerization reaction apparatus. Referring to Figure 2, the resin polymerization reaction apparatus 100 according to a preferred embodiment of the present invention includes a reactor 110, a stirring unit 120, a perforated plate 130, and a gas injection unit 140.

[0048] The reactor 110 is a device in which a polymerization reaction for the resin R is carried out. The reactor 110 includes a cylindrical main body 111, a funnel portion 112 having a funnel structure that extends downward from the main body, and a discharge port 113 formed at the lower end of the funnel portion 112.

[0049] The gas injection unit 140 is connected to the upper part of the reactor 110.

[0050] The gas injection unit 140 is a device that injects gas G into the upper part of the reactor 110. The gas G having a predetermined pressure is injected into the upper part of the reactor 110 through the gas injection unit 140, and pushes the resin R to the lower part of the reactor 110. As the gas G, nitrogen N2 can be used.

[0051] Figure 3 is an operating state diagram of the resin polymerization reaction apparatus. Figure 4 is an internal perspective view of the reactor, and is a diagram for explaining the structure of the stirring unit 120 installed in the reactor.

[0052] Referring to Figures 3 and 4, the stirring unit 120 is rotatably installed inside the reactor 110. The stirring unit 120 stirs the resin R after completion of the polymerization reaction of the resin R.

[0053] The stirring unit 120 is composed of a stirring motor 121, a stirring rod 122, an upper support base 123, a lower support base 125, stirring blades 124, lower blades 126, and an intermediate support base 127.

[0054] The stirring motor 121 is coupled to the stirring rod 122 outside the reactor 110. The stirring motor 121 provides a rotational force to the stirring rod 122.

[0055] The stirring rod 122 is installed inside the reactor 110 in the discharge direction F of the resin R. The rotation axis of the stirring rod 122 is located on the same axis as the center of the discharge port 113.

[0056] An upper support base 123 and a lower support base 125 are installed on the stirring rod 122. The upper support base 123 and the lower support base 125 are installed on the stirring rod 122 so as to be perpendicular to the discharge direction F.

[0057] The upper support base 123 is installed on the stirring rod 122 at a distance from the upper end to the lower part of the reactor 110. The lower support base 125 is installed at the lower part of the stirring rod 122 alongside the upper support base 123. A lower blade 126 extended from the stirring blade 124 is formed on the lower support base 125.

[0058] An intermediate support base 127 is installed between the upper support base 123 and the lower support base 125. The intermediate support base 127 supports the stirring blade 124 alongside and at a distance from the upper support base 123 and the lower support base 125.

[0059] The stirring blade 124 has a double helix structure and is coupled to the upper support base 123 and the lower support base 125. In order to embody the double helix structure, the stirring blade 124 is composed of a first stirring blade 124a and a second stirring blade 124b.

[0060] The first stirring blade 124a and the second stirring blade 124b have a spiral structure.

[0061] The upper end of the first stirring blade 124a is coupled to one end 123a of the upper support base, and the lower end is coupled to one end 125a of the lower support base. The upper end of the second stirring blade 124b is coupled to the other end 123b of the upper support base, and the lower end is coupled to the other end 125b of the lower support base.

[0062] The lower blade 126 includes a first lower blade 126a and a second lower blade 126b.

[0063] Referring to FIGS. 2 to 4, the first lower blade 126a and the second lower blade 126b are symmetric about the rotation axis of the stirring rod 122, but are separated by a distance D greater than the diameter R1 of the discharge port 113. The first lower blade 126a and the second lower blade 126b are located in the funnel portion 112 of the reactor 110.

[0064] The first lower blade 126a extends to the lower part of the lower support base 125 at the lower end of the first stirring blade 124a. The first lower blade 126a is formed to incline downward in the discharge direction F from one end 125a of the lower support base toward the rotation axis of the stirring rod 122. The first lower blade 126a has a triangular cross section.

[0065] The second lower blade 126b extends to the lower part of the lower support base 125 at the lower end of the second stirring blade 124b. The second lower blade 126b is formed to incline downward in the discharge direction F from the other end of the lower support base 125 toward the rotation axis of the stirring rod 122. The second lower blade 126b has a triangular cross section.

[0066] The stirring unit 120 stirs the resin R existing in the upper part of the funnel portion 112 by the stirring blade 124 while the stirring blade 124 and the lower blade 126 rotate in the rotation direction of the stirring rod 122, and stirs the resin R existing in the funnel portion 112 by the lower blade 126.

[0067] Accordingly, in the present invention, by stirring the resin R existing in the funnel portion 112 by the lower blade 126, the problem that the conventional resin R solidifies around the discharge port 113 and blocks the discharge port 113 can be solved.

[0068] In this embodiment, a perforated plate 130 is installed at the discharge port 113 of the reactor 110. The perforated plate 130 is detachably installed at the discharge port 113. As for the coupling structure between the perforated plate 130 and the discharge port 113, various structures within the obvious range from the perspective of those skilled in the art are applicable.

[0069] Referring to FIGS. 2 and 5, a plurality of discharge openings 133 are formed in the perforated plate 130. FIG. 2 is a configuration diagram of the resin polymerization reaction apparatus, and FIG. 5 is a diagram schematically showing a plan view of the perforated plate.

[0070] The plurality of discharge openings 133 are spaced apart along a virtual concentric circle C having a predetermined diameter with respect to the center of the perforated plate 130.

[0071] For example, it is preferable that the diameter R3 of the concentric circle is within the range of 1 / 4 to 5 / 7 of the diameter R1 of the discharge port 113. For example, if the diameter R1 of the discharge port 113 is 80 mm, the diameter R3 of the virtual concentric circle C is within the range of 20 mm to 58 mm.

[0072] As shown in FIG. 5, the perforated plate 130 has a plurality of discharge openings 133 on the virtual concentric circle C. The diameter R3 of the virtual concentric circle C can be 1 / 2 of the diameter R1 of the discharge port 113.

[0073] The plurality of discharge openings 133 are radially spaced apart along a virtual concentric circle C with respect to the center of the perforated plate 130. The plurality of discharge openings 133 are formed with the same diameter for each perforated plate 130.

[0074] It is preferable that the diameter R2 of the discharge opening 133 is within the range of 3 / 80 to 10 / 80 of the diameter R1 of the discharge port 113. For example, if the diameter R1 of the discharge port 113 is 80 mm, the discharge opening 133 has a diameter of 3 mm to 10 mm.

[0075] When the requirements of the pelletizing process require the resin R to be discharged at a high speed, it is preferable that the plurality of discharge openings 133 have a diameter R2 of the discharge opening 133 within the range of 1 / 16 to 1 / 8 of the diameter R1 of the discharge port 113. For example, if the diameter R1 of the discharge port 113 is 80 mm, the diameter R2 of the discharge opening 133 is within the range of 5 mm to 10 mm.

[0076] The requirements of the pelletizing process do not significantly affect the discharge speed. However, when the discharge amount of resin R is important, the plurality of discharge openings 133 can have a diameter R2 of the discharge openings 133 within the range of 3 / 80 to 1 / 16 of the diameter R1 of the discharge port 113. For example, when the diameter R1 of the discharge port 113 is 80 mm, the diameter R2 of the discharge openings 133 is within the range of 3 mm to 5 mm.

[0077] When the requirements of the pelletizing process require a large discharge amount of resin R at a high speed, the plurality of discharge openings 133 can have a diameter R2 of the discharge openings 133 within the range of 1 / 16 to 1 / 10 of the diameter R1 of the discharge port 113. For example, when the diameter R1 of the discharge port 113 is 80 mm, the diameter R2 of the discharge openings 133 is within the range of 5 mm to 8 mm.

[0078] The present invention can adjust the discharge amount and discharge speed of resin R by adjusting the discharge area of resin R through the perforated plate. And, the present invention can adjust the thickness of the biodegradable resin R according to the requirements of the pelletizing process that proceeds after the polymerization process through the alternation of the perforated plates, so that the progress efficiency of the entire process can be improved.

[0079] Hereinafter, with reference to Table 1, FIG. 6 and FIG. 7, the discharge speed and the discharge amount increase rate due to the diameter R2 of the discharge opening 133 will be described.

[0080] Table 1 is a result table of Experiments 1 to 4 for the ratio of the discharge speed and the ratio of the discharge amount of resin R according to the diameter of the discharge opening. FIG. 6 is a graph comparing the ratio of the discharge speed of resin R according to the diameter R2 of the discharge opening 133 of the perforated plate 130. FIG. 7 is an experimental graph of the discharge amount according to the diameter of the discharge opening of the perforated plate.

[0081]

Table 1

[0082] Experiment 1 is an experiment on the ratio of the discharge rate and the ratio of the discharge amount of the resin R discharged from the perforated plate 130 having a discharge opening 133 with a diameter of 5 mm. Referring to Table 1, assume that the ratio of the discharge rate of the resin R discharged from the perforated plate 130 having a discharge opening 133 with a diameter of 5 mm is 1. Then, referring to Table 1, it can be seen that the discharge amount of the resin R discharged from the perforated plate 130 having a discharge opening 133 with a diameter of 5 mm is 78.9% of the total discharge amount. Hereinafter, based on Experiment 1, the ratio of the discharge rate and the ratio of the discharge amount by Experiments 2 to 4 will be examined.

[0083] Experiment 2 is an experiment on the ratio of the discharge rate and the ratio of the discharge amount of the resin R discharged from the perforated plate 130 having a discharge opening 133 with a diameter of 3 mm.

[0084] The ratio of the discharge rate in Experiment 2 is 0.2 times the ratio of the discharge rate in Experiment 1 when the ratio of the discharge rate in Experiment 1 is assumed to be 1. It can be seen that the discharge amount of the resin R in Experiment 2 is 82% of the total discharge amount. Compared with the 5 mm discharge opening 133, it can be seen that the 3 mm discharge opening 133 significantly reduces the discharge rate to 0.2 times, but the ratio of the discharge amount increases by 3.1% from 78.9% to 82%.

[0085] The ratio of the discharge rate in Experiment 3 is 4.1 times the ratio of the discharge rate in Experiment 1 when the ratio of the discharge rate in Experiment 1 is assumed to be 1. It can be seen that the discharge amount of the resin R in Experiment 3 is 58.4% of the total discharge amount. Compared with the 5 mm discharge opening 133, it can be seen that the 8 mm discharge opening 133 increases the discharge rate by 4.1 times, but the ratio of the discharge amount decreases by 20.5% from 78.9% to 58.4%.

[0086] The ratio of the discharge rate in Experiment 4 is 7.8 times the ratio of the discharge rate in Experiment 1 when the ratio of the discharge rate in Experiment 1 is assumed to be 1. It can be seen that the discharge amount of the resin R in Experiment 3 is 49.1% of the total discharge amount. Compared with the 5 mm discharge opening 133, it can be seen that the 10 mm discharge opening 133 rapidly increases the discharge rate by 7.8 times, but the ratio of the discharge amount rapidly decreases by 29.8% from 78.9% to 49.1%.

[0087] Comparing the results of Table 1, it can be seen that under the same conditions, the larger the diameter R2 of the discharge opening 133, i.e., the larger the discharge area, the faster the discharge speed of the resin R. Furthermore, under the same conditions, it can be seen that the smaller the diameter R2 of the discharge opening 133, i.e., the smaller the discharge area, the greater the discharge amount of the resin R. Here, the same conditions refer to cases where the type of resin R and the discharge temperature of the resin R are the same.

[0088] Therefore, from Experiments 1 to 4, the following results are derived: in order to increase the amount of resin R discharged, the diameter R2 of the discharge opening 133 must be small; and in order to shorten the discharge time, the diameter R2 of the discharge opening 133 must be large.

[0089] The temperature of the reactor 110 is controlled so that the discharge preheating temperature of the resin R is higher than the polymerization reaction temperature of the resin R.

[0090] After the polymerization reaction of the resin R is completed, the reactor 110 heats the resin R to a discharge preheating temperature. The discharge preheating temperature is a temperature that is 20 to 50 degrees higher than the polymerization reaction temperature. The discharge preheating temperature is preferably 30 degrees higher than the polymerization reaction temperature.

[0091] The present invention can increase the discharge temperature of resin R through temperature control of the reactor and reduce the viscosity of resin R, thereby increasing the discharge speed of resin R, thereby achieving the effect of shortening the discharge time of resin R.

[0092] Referring to FIG. 8, the flow of the fluid of the resin R before and after the discharge of the resin R will be explained in detail as follows.

[0093] 8(a) is a CFD image before the resin R is discharged from the reactor 110 after the polymerization process, and FIG. 8(b) is a CFD image at the point when the discharge of the resin R from the reactor 110 is almost complete. The CFD image is an image obtained by computer analysis of the flow of a fluid.

[0094] Figure 8(a) is an image of the volume fraction distribution of resin R when the discharge of resin R from reactor 110 starts after the polymerization step. Figure 8(b) is an image of the volume fraction distribution of resin R when the discharge of resin R from reactor 110 is almost complete.

[0095] Here, the image of the volume fraction distribution of resin R is an image obtained by computer-analyzing the flow of resin R using computational fluid dynamics.

[0096] The volume fraction is expressed as 0 or 1. Here, 0 represents the region where resin R does not exist, which is represented by the blue region in the image of Figure 8. And 1 represents the region where resin R exists, which is represented by the red region in the image of Figure 8.

[0097] Also, in Figure 8, the green region is the boundary between the red region (where resin R exists) and the blue region (where resin R does not exist). Referring to Figure 8(b), it can be seen that when the discharge of resin R from reactor 110 is almost complete, resin R remains in the funnel portion 112 of reactor 110 and is not discharged.

[0098] [Table 2]

[0099] The experimental result values in Table 2 are the experimental result values for the case where only the discharge temperature of resin R is changed from 180 degrees to 210 degrees under the same conditions. Table 2 is based on Experiment 1, with the discharge temperature of resin R increased from 180 degrees (the polymerization reaction temperature) to 210 degrees. Experiment 5 is the experimental result value for the case where only the discharge temperature of resin R is changed from 180 degrees to 210 degrees in Experiment 1. However, the discharge preheating temperature is the temperature raised to a certain range or more above the polymerization reaction temperature, and is a temperature adjustable according to the type of resin R and the specifications of reactor 110, and is not necessarily limited to 210 degrees.

[0100] The discharge rate in Experiment 5 is 81.5%, which is 2.6% higher than 78.9% which is the discharge rate in Experiment 1. It can be seen that the discharge rate in Experiment 5 is almost close to the discharge rate in Experiment 1.

[0101] When assuming that the ratio of the discharge speed in Experiment 1 is 1, it can be seen that the ratio of the discharge speed in Experiment 5 is 7.9 times that of the discharge speed in Experiment 2. From this, it can be seen that the discharge speed of resin R is affected by the discharge temperature of resin R.

[0102] Combining Table 1 and Table 2, it can be seen that the present invention can adjust the discharge amount of resin R by adjusting the discharge area of resin R through the perforated plate 130.

[0103] At the same time, the present invention can increase the discharge speed of resin R by increasing the discharge temperature of resin R through temperature control of the reactor 110 to lower the viscosity of resin R, thereby deriving the effect of shortening the discharge time of resin R.

[0104] In addition, since the present invention can adjust the thickness of the biodegradable resin R according to the requirements of the pelletizing process that proceeds after the polymerization process through the replacement of the perforated plate 130, the progress efficiency of the entire process can be improved.

[0105] The present invention can improve the discharge efficiency of the biodegradable resin R by heating the resin R to the resin R discharge preheating temperature after the completion of the polymerization reaction of the resin R to lower the viscosity of the resin R and improve the fluidity of the resin R.

[0106] As described above, the present invention has been specifically described through examples. However, the scope of the present invention is not limited by the following examples. The preferred embodiments of the present invention described above are disclosed for illustrative purposes, and those skilled in the art with ordinary knowledge of the present invention can make various modifications, changes, and additions within the spirit and scope of the present invention, and such modifications, changes, and additions should be regarded as belonging to the following claims.

Explanation of Reference Numerals

[0107] 100 Resin polymerization reaction device 110 Reactor 111 Body 112 Funnel part 113 Discharge port 120 Stirring part 121 Stirring motor 122 Stirring rod 123 Upper support stand 124 Stirring blade 125 Lower support stand 126 Lower blade 127 Intermediate support stand 130 Perforated plate 133 Discharge opening 140 Gas injection part

Claims

1. A reactor in which a resin is contained and a resin polymerization reaction is carried out, a stirring unit installed inside the reactor for stirring the resin, and a discharge port located at the lower part of the reactor and including a plurality of discharge openings having an opening diameter within the range of 3 / 80 to 10 / 80 of the diameter of the discharge port, wherein the reactor is temperature-controlled such that the preheating temperature of the resin discharge is higher than the polymerization reaction temperature of the resin. A resin polymerization reaction apparatus.

2. The resin polymerization reaction apparatus according to claim 1, wherein the plurality of discharge openings have the same diameter.

3. The resin polymerization reaction apparatus according to claim 1, wherein the plurality of discharge openings are spaced apart and arranged along the circumferential direction of a virtual concentric circle having a predetermined radius with respect to the center of the discharge port.

4. The resin polymerization reaction apparatus according to claim 3, wherein the virtual concentric circle has a diameter within the range of 1 / 4 to 5 / 7 of the diameter of the discharge port.

5. The resin polymerization reaction apparatus according to claim 1, wherein the plurality of discharge openings are spaced apart and arranged radially with respect to the center of the discharge port.

6. The resin polymerization reaction apparatus according to claim 1, further comprising at least one perforated plate in which the plurality of discharge openings are formed and which is detachably coupled to the discharge port.

7. The resin polymerization reaction apparatus according to claim 6, wherein the perforated plate is formed such that the plurality of discharge openings have the same diameter within the range of the opening diameter, and the range of the opening diameter is within the range of 3 / 80 to 10 / 80 of the diameter of the discharge port.

8. The resin polymerization reaction apparatus according to claim 1, wherein the reactor heats the resin to the preheating temperature of the resin discharge after completion of the polymerization reaction of the resin.

9. The resin polymerization reaction apparatus according to claim 8, wherein the preheating temperature of the resin discharge is a temperature higher than the polymerization reaction temperature by 20 to 50 degrees.

10. The resin polymerization reaction apparatus according to claim 8, wherein the preheating temperature of the resin discharge is a temperature 30 degrees higher than the polymerization reaction temperature.

11. The stirring unit is a stirring rod installed inside the reactor in the discharge direction of the resin, a stirring motor that provides a rotational force to the stirring rod, an upper support base installed above the stirring rod so as to be perpendicular to the discharge direction, a lower support base installed below the stirring rod alongside the upper support base, and The resin polymerization reactor according to claim 1, characterized in that it includes a stirring blade coupled to the upper support base and the lower support base in a double helix structure.

12. The stirring blade has a spiral structure, and includes a first stirring blade with its upper end coupled to one end of the upper support base and its lower end coupled to the other end of the lower support base, and has a spiral structure, and includes a second stirring blade with its upper end coupled to the other end of the upper support base and its lower end coupled to one end of the lower support base, the resin polymerization reactor according to claim 11.

13. The stirring unit further includes a lower blade inclined downward in the discharge direction from the tip of the lower support base, the resin polymerization reactor according to claim 12.

14. The lower blade extends to the lower part of the lower support base at the lower end of the first stirring blade, and includes a first lower blade inclined downward in the discharge direction toward the rotation axis of the stirring rod at one end of the lower support base, and extends to the lower part of the circumferential lower support base at the lower end of the second stirring blade, and includes a second lower blade inclined downward in the discharge direction toward the rotation axis of the stirring rod at the other end of the lower support base, the resin polymerization reactor according to claim 13.

15. The first lower blade and the second lower blade have a triangular cross-section and are formed to be symmetric about the rotation axis of the stirring rod, the resin polymerization reactor according to claim 14.

16. The first lower blade and the second lower blade are symmetric about the rotation axis of the stirring rod and are separated at an interval larger than the diameter of the discharge port, the resin polymerization reactor according to claim 14.

17. The lower blade is located in the funnel part of the reactor and has a structure inclined downward from the tip of the lower support base at an inclination corresponding to the inclined surface of the funnel part, the resin polymerization reactor according to claim 13.

18. The stirring unit is characterized in that while the stirring blade and the lower blade rotate in the rotation direction of the stirring rod, the stirring blade stirs the resin present in the upper part of the funnel part, and the lower blade stirs the resin present in the funnel part, the resin polymerization reactor according to claim 17.

19. It further includes a gas injection part for injecting gas into the upper part of the reactor, The resin polymerization reactor according to claim 1, wherein the gas pressurizes the resin at a predetermined pressure so that the resin moves toward the discharge port.

20. The resin polymerization reactor according to claim 1, wherein the diameter of the discharge opening is in the range of 1 / 16 to 1 / 8 of the diameter of the discharge port.

21. The resin polymerization reactor according to claim 1, wherein the diameter of the discharge opening is in the range of 1 / 16 to 1 / 10 of the diameter of the discharge port.

22. The resin polymerization reactor according to claim 1, wherein the diameter of the discharge opening is in the range of 3 / 80 to 1 / 10 of the diameter of the discharge port.

23. A resin discharge method, characterized in that a resin polymerization reaction is carried out in a reactor using the resin polymerization reactor according to any one of claims 1 to 22, and the resin is discharged from the reactor after the polymerization reaction of the resin.

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