TGIC (triglycidyl isocyanurate) melting granulation device

Abstract

The utility model discloses a TGIC (triglycidyl isocyanurate) melting granulation device, and relates to the technical field of TGIC melting granulation, in particular to the TGIC melting granulation device, which comprises a steel belt granulator for forming TGIC material granules, a mixed melting stirring kettle, a melt pump, a vacuum pump and a steam generator, according to the TGIC melting granulation device, TGIC wet powder obtained after synthesis and alcohol crystallization is conveyed into the mixing melting stirring kettle through the feeding pipe, the wet powder in the inner furnace body is stirred through the stirring component, steam generated by the steam generator is conveyed to the heat exchange pipe, the inner furnace body is heated through the heat exchange pipe, and then the wet powder in the inner furnace body is melted; the vacuum degree in the inner furnace body is adjusted through a vacuum pump, vacuum devolatilization is carried out, and epoxy chloropropane, alcohols and other impurities in the TGIC melt are removed; and the melt in the mixing and melting stirring kettle is conveyed to the steel belt granulator through the melt pump, and the dripping TGIC melt is molded and granulated by utilizing the steel belt granulator, so that the aim of melting and granulating the TGIC wet powder is fulfilled.

Description

Technical Field

[0001] The utility model relates to the technical field of TGIC melting granulation, in particular to a TGIC melting granulation device. Background Art

[0002] Triglycidyl isocyanurate (TGIC for short) is a crystalline heterocyclic epoxy compound. Its three active epoxy groups can undergo cross-linking reaction with the hydroxyl groups in polyester resin. Due to its excellent heat resistance, weather resistance, corrosion resistance, chemical resistance and mechanical properties, TGIC is widely used as a cross-linking curing agent for polyester resin or acrylic resin powder coatings. It can also be used in structural materials, electrical insulation materials, printed circuit boards, modified epoxy resins, high-efficiency adhesives and other fields.

[0003] The existing TGIC production process generally includes: (1) condensation reaction of cyanuric acid and epichlorohydrin in the presence of a catalyst and at a certain temperature; (2) lowering the temperature and adding alkali to produce triglycidyl isocyanurate by epoxidation; (3) washing and vacuum distillation to recover excess raw materials; and (4) adding alcohol to crystallize and drying to obtain the finished product.

[0004] In the TGIC production process, in order to make the condensation reaction proceed smoothly, an excessive amount of epichlorohydrin is usually added, and the residue of epichlorohydrin in the TGIC product will have a certain irritation to human skin, and affect the curing efficiency of the product and the performance of the coating. Therefore, after the reaction is completed, epichlorohydrin will be removed and recovered by distillation, such as JP-B-45-22751 using a rotary evaporator to remove epichlorohydrin, US4395542 using a multi-stage stripping tower to remove epichlorohydrin by multi-stage stripping, and CN102174040A using reduced pressure distillation plus high vacuum thin film evaporator to remove epichlorohydrin. These traditional methods all use high vacuum and high temperature distillation processes to remove epichlorohydrin residues. The temperature rises to 100-120°C in the distillation process, and the distillation time requires 3-6h, which not only requires a large amount of energy consumption and increases production costs, but also the product is prone to polymerization explosion danger under high temperature conditions, and it is difficult to achieve the desired effect. Controlling the content of epichlorohydrin in TGIC products below 100 ppm, especially below 50 ppm, is an urgent problem to be solved in order to improve the safety and performance of TGIC products and expand the application areas of TGIC.

[0005] In addition, alcohols such as methanol or ethanol are used to crystallize the TGIC solution to obtain powdered TGIC, which contains about 15-25% methanol or ethanol, called wet powder. In the production process, it is also necessary to remove the alcohol by drying, and then extrusion granulation is performed to facilitate packaging and transportation.

[0006] CN201420188579.4 and CN201410155719.2 disclose a triglycidyl isocyanurate dry powder extrusion granulation production line and production process, including a vibration dryer, a condenser connected to the gas outlet of the vibration dryer, a solvent recovery tank and a gas induced draft fan I connected to the condenser in sequence; a dry powder cyclone separator and a dry powder tank connected to the material outlet of the vibration dryer, and the discharge port of the dry powder tank connected to a material extruder, a tablet press, a belt cooling conveyor, a pulverizer, a screening machine and a packaging machine in sequence.

[0007] CN201110443507.0 uses microwave heating to heat TGIC, so that the methanol in TGIC is volatilized. During the heating period, the entire oven is in a negative pressure state, and the volatilized methanol gas enters the methanol recovery system. The characteristic of microwave selective heating of products enables TGIC to be evenly heated during the drying process, solving the problems of material agglomeration and material agglomeration in traditional processes. The volatilized methanol gas is cooled by three condensers, and 95% of the methanol is recycled.

[0008] In the published Chinese patent application, the announcement number is: CN218962542U, and the patent name is: TGIC high-efficiency devolatilization and melt extrusion granulation integrated device. The TGIC high-efficiency devolatilization and melt extrusion granulation integrated device of the present application adds materials to the main feeding port, and the materials are melted by heating in the feeding melting zone and transported to the discharge end by the cooperation of a twin screw. By setting at least three exhaust zones, multiple devolatilizations are performed during the material transportation process, and different substances can be devolatilized and collected by controlling different pressures; the materials pass through the exhaust zone and are connected to the vacuum pump system through the vacuum port on the exhaust zone, and the volatilized substances after the materials are melted are discharged and collected through the vacuum pump system, and a side feeding device is added between the last vacuum port and the outlet to realize the feeding of TGIC dry powder, improve the TGIC crystallization rate, and further improve the production efficiency.

[0009] In the conventional TGIC wet powder extrusion granulation process shown in the above prior art, the drying equipment is complex and the drying process takes a long time. Therefore, in order to solve the problems existing in the prior art, this application is specially proposed to solve them. Utility Model Content

[0010] 1. Technical issues to be solved

[0011] In view of the deficiencies of the prior art, the utility model provides a TGIC melt granulation device, which solves the problems raised in the above background technology.

[0012] (II) Technical solution

[0013] To achieve the above objectives, the utility model is implemented through the following technical solutions: a TGIC melt granulation device, including a steel belt granulator for forming TGIC material particles, and also including a melt mixing and stirring kettle, a melt pump, a vacuum pump, and a steam generator; the melt mixing and stirring kettle is equipped with at least one feed pipe connected to the inside thereof, and a first discharge pipe is installed at the bottom of one end of the melt mixing and stirring kettle; the kettle body of the melt mixing and stirring kettle is cylindrical as a whole, and the kettle body of the melt mixing and stirring kettle is composed of an outer furnace body and an inner furnace body arranged inside the outer furnace body, and the outer furnace body and A heating chamber is formed between the inner furnace bodies, the interior of the inner furnace body is a stirring chamber, at least ten return heat exchange tubes are arranged on the outer wall of the inner furnace body and around the heating chamber, and a second vacuum tube is arranged on the inner top wall of the inner furnace body; a stirring component is installed on the mixing stirring kettle; the steam outflow end of the steam generator is connected with the inflow end of the heat exchange tube, the gas medium inflow end of the vacuum pump is connected with one end of the second vacuum tube, the outflow end of the first discharge pipe is connected with the feed port of the melt pump, and a steel belt granulator is arranged at the material outflow end of the melt pump.

[0014] Optionally, the stirring component includes a stirring shaft and a plurality of stirring rods located in the stirring chamber, one end of the stirring shaft is rotatably connected to the inner wall of the kettle body, the other end of the stirring shaft passes through the side wall of the kettle body, and each stirring rod is fixedly mounted on the outer wall of the stirring shaft.

[0015] Optionally, the stirring component further includes a servo motor and a reducer, and the output shaft of the servo motor is coaxially connected to one end of the stirring shaft through the reducer.

[0016] Optionally, a material distribution machine connected to the material distribution machine is installed at the material outflow end of the melt pump, and the material outflow end port of the material distribution machine is located above the forming steel belt of the steel belt granulator.

[0017] Optionally, the second vacuum tube is provided with a plurality of through holes penetrating its wall; a first vacuum tube is installed at the gas medium inlet end of the vacuum pump, the vacuum pump is connected with the second vacuum tube through the first vacuum tube, and a gas tank is installed at the gas medium outlet end of the vacuum pump.

[0018] Optionally, a pressure relief valve is provided on the kettle body of the melt-mixing stirring kettle, and a temperature sensor is provided on the inner side wall of the inner furnace body of the melt-mixing stirring kettle.

[0019] Optionally, a control panel is also included, which is respectively connected to the steel belt granulator, the melt pump, the vacuum pump, the steam generator and the stirring component for control.

[0020] (III) Beneficial effects

[0021] The utility model provides a TGIC melting granulation device, which has the following beneficial effects:

[0022] 1. The TGIC melt granulation device transports the synthesized TGIC wet powder obtained after alcohol crystallization into a mixing and stirring kettle through a feed pipe, stirs the wet powder in the inner furnace body through a stirring component, transports the steam generated by a steam generator to a heat exchange tube, heats the inner furnace body by the heat exchange tube, and melts the wet powder in the inner furnace body; adjusts the vacuum degree inside the inner furnace body by a vacuum pump, performs vacuum devolatilization, and removes impurities such as epichlorohydrin and alcohols in the TGIC melt; transports the melt in the mixing and stirring kettle to a steel belt granulator by a melt pump, and forms and granulates the dripping TGIC melt by the steel belt granulator, thereby achieving the purpose of TGIC wet powder melt granulation.

[0023] 2. The TGIC melting granulation device uses steam as a heat source. The heat carried by the steam can be evenly transferred to the inner furnace body, so that the inner furnace body is heated up as a whole. After the inner furnace body is heated up as a whole, the wet powder inside it can be effectively heated up. While the TGIC wet powder is heated up and melted, the air and moisture inside the kettle body are extracted under the action of the vacuum pump and the second vacuum tube, so that the melt can be effectively dried. The drying process is carried out synchronously with the melting of the TGIC wet powder, which reduces the drying time, and the parts used for drying are relatively simple, which reduces the drying cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0025] Figure 1 This is a schematic diagram of the installation and connection structure of the TGIC melt granulation device of the utility model;

[0026] Figure 2 It is a schematic cross-sectional structure diagram of a mixing and stirring kettle of a TGIC melt granulation device of the utility model.

[0027] In the figure: 1. mixing and stirring kettle; 101. outer furnace body; 102. inner furnace body; 2. melt pump; 3. steel belt granulator; 4. vacuum pump; 5. steam generator; 6. feed pipe; 7. servo motor; 8. reducer; 9. steam delivery pipe; 10. first vacuum tube; 11. heat exchange tube; 12. second vacuum tube; 13. stirring shaft; 14. stirring rod; 15. pressure relief valve; 16. first discharge pipe. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indications or implications.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments.

[0030] For example, see Figure 1 to Figure 2 The utility model provides a technical solution: a TGIC melt granulation device, including a steel belt granulator 3 for forming TGIC material particles. The TGIC melt granulation device also includes a mixing and stirring kettle 1, a melt pump 2, a vacuum pump 4, and a steam generator 5.

[0031] The melt mixing and stirring kettle 1 is used to hold the TGIC wet powder so that the TGIC wet powder can be melted, dried, stirred and mixed therein. The steam generator 5 is used to generate steam, and the heat carried by the steam is transferred to the melt mixing and stirring kettle 1, so that the melt mixing and stirring kettle 1 is heated as a whole. The vacuum pump 4 is used to adjust the vacuum degree inside the melt mixing and stirring kettle 1. The steel belt granulator 3 is used for TGIC melt granulation.

[0032] At least one feed pipe 6 connected to the interior of the melt mixing stirring kettle 1 is installed, and a first discharge pipe 16 is installed at the bottom of one end of the melt mixing stirring kettle 1. The kettle body of the melt mixing stirring kettle 1 is cylindrical as a whole, and the kettle body of the melt mixing stirring kettle 1 is composed of an outer furnace body 101 and an inner furnace body 102 arranged inside the outer furnace body 101. A heating chamber is formed between the outer furnace body 101 and the inner furnace body 102, and the interior of the inner furnace body 102 is a stirring chamber. On the outer side wall of the inner furnace body 102 and located at the heating chamber, at least ten return heat exchange tubes 11 are arranged around, and a second vacuum tube 12 is arranged on the inner top wall of the inner furnace body 102.

[0033] A stirring component is installed on the mixing and stirring kettle 1. The steam outflow end of the steam generator 5 is connected to the inflow end of the heat exchange tube 11, the gas medium inflow end of the vacuum pump 4 is connected to one end of the second vacuum tube 12, the outflow end of the first discharge pipe 16 is connected to the feed port of the melt pump 2, and the material outflow end of the melt pump 2 is provided with a steel belt granulator 3.

[0034] Among them, the TGIC wet powder obtained after synthesis and crystallization of alcohols is added to the mixing and stirring kettle 1 through the feed pipe 6. The steam generated by the steam generator 5 flows into the heat exchange tube 11, and the steam heats up the heat exchange tube 11 and the inner furnace body 102 as a whole. After the inner furnace body 102 is heated, the TGIC wet powder located inside it is melted. The vacuum pump 4 is used to extract the air and moisture in the inner furnace body 102 through the second vacuum tube 12 to achieve the purpose of drying the TGIC wet powder. The vacuum pump 4 is used to adjust the vacuum degree inside the inner furnace body 102, and vacuum devolatilization is performed to remove impurities such as epichlorohydrin and alcohols in the TGIC melt. The melt pump 2 is used to extract the TGIC melt in the mixing and stirring kettle 1, and transport the TGIC melt to the forming steel belt of the steel belt granulator 3. The TGIC melt drips on the forming steel belt of the steel belt granulator 3, thereby realizing the granulation molding of TGIC.

[0035] Specifically, the stirring component includes a stirring shaft 13 and a plurality of stirring rods 14 located in the stirring chamber. One end of the stirring shaft 13 is rotatably connected to the inner wall of the kettle body, and the other end of the stirring shaft 13 passes through the side wall of the kettle body. Each stirring rod 14 is fixedly mounted on the outer wall of the stirring shaft 13.

[0036] The stirring member is used to stir the melt in the melt mixing and stirring kettle 1 to stir and mix the TGIC melt. The stirring shaft 13 rotates to drive each stirring rod 14 to rotate and stir the TGIC melt.

[0037] More specifically, the stirring component further includes a servo motor 7 and a reducer 8 , and the output shaft of the servo motor 7 is coaxially connected to one end of the stirring shaft 13 through the reducer 8 .

[0038] The servo motor 7 is used to drive the stirring shaft 13 to rotate, and the rotation of the stirring shaft 13 drives each stirring rod 14 to rotate.

[0039] Specifically, a pressure relief valve 15 is provided on the kettle body of the melt-mixing stirring kettle 1 , and a temperature sensor is provided on the inner wall of the inner furnace body 102 of the melt-mixing stirring kettle 1 .

[0040] The pressure relief valve 15 is a solenoid valve, which is used to relieve the pressure inside the furnace body 102 in the mixing and stirring kettle 1. The temperature sensor is used to detect the temperature inside the furnace body 102.

[0041] Specifically, the TGIC melt granulation device also includes a control panel, which is respectively connected to the steel belt granulator 3, the melt pump 2, the vacuum pump 4, the steam generator 5 and the stirring component. The control panel can be a single-chip microcomputer or an editable logic controller, and the control panel is equipped with a logic control program, a timing control program, etc. to meet the control needs of various parts, electrical components, etc. in the TGIC melt granulation device shown in this application. The control panel is used to control the start and stop of the steel belt granulator 3, the melt pump 2, the vacuum pump 4, the steam generator 5 and the stirring component (the servo motor 7 in the stirring component). The control panel is also electrically connected to the temperature sensor of the material distribution machine and the pressure relief valve 15 through wires.

[0042] When in use, the TGIC wet powder obtained after synthesis and crystallization of alcohols is added to the inner furnace body 102 of the mixed melting stirring kettle 1 through the feed pipe 6. The control panel controls the start of the servo motor 7, and the servo motor 7 drives the stirring shaft 13 to rotate, and the stirring shaft 13 drives each stirring rod 14 to rotate and stir the TGIC wet powder. The steam generated by the steam generator 5 is transported to the heat exchange tube 11 through the steam delivery pipe 9, and the heat carried by the steam is transferred to the heat exchange tube 11 and the inner furnace body 102, and the inner furnace body 102 is heated as a whole. The TGIC wet powder in the inner furnace body 102 melts at high temperature. After the vacuum pump 4 is started, the gas and moisture inside the inner furnace body 102 are extracted through the second vacuum tube 12, so that the TGIC melt in the inner furnace body 102 is dried; at the same time, impurities such as epichlorohydrin and alcohols in the TGIC melt are removed.

[0043] TGIC wet powder is continuously added through the feed pipe 6 to further increase the output and reduce the problem of uneven melting and plasticization caused by centralized feeding. At the same time, TGIC dry powder from which epichlorohydrin and alcohols have been removed is added as a seed for its crystallization and molding, which can accelerate the cooling time of TGIC crystallization. Finally, the melt mixed with TGIC dry powder is sent to the steel belt granulator 3 through the first discharge pipe 16 via the melt pump 2, and the steel belt granulator 3 forms and granulates the dripping TGIC melt to obtain TGIC particles.

[0044] For example 2, please refer to Figure 1 to Figure 2 The difference between this embodiment and the first embodiment is that: a plurality of through holes penetrating the wall of the second vacuum tube 12 are provided on the second vacuum tube 12. A first vacuum tube 10 is installed at the gas medium inflow end of the vacuum pump 4, the vacuum pump 4 is connected with the second vacuum tube 12 through the first vacuum tube 10, and a gas tank is installed at the gas medium outflow end of the vacuum pump 4.

[0045] After the vacuum pump 4 is started, the gas and moisture inside the inner furnace body 102 are extracted through the second vacuum tube 12 and the first vacuum tube 10, so that the TGIC melt in the inner furnace body 102 is dried; at the same time, impurities such as epichlorohydrin and alcohols in the TGIC melt are removed. The gas tank is used to collect gas containing epichlorohydrin, alcohols, etc.

[0046] Specifically, a material distribution machine connected to the melt pump 2 is installed at the material outflow end thereof, and a material outflow port of the material distribution machine is located above the forming steel belt of the steel belt granulator 3 .

[0047] Among them, the melt mixed with TGIC dry powder is sent to the distribution machine through the first discharge pipe 16 via the melt pump 2, and the TGIC melt is evenly formed into a spherical liquid through the distribution machine head and drips onto the forming steel belt of the steel belt granulator 3. The steel belt granulator 3 shapes and granulates the dripping TGIC melt to obtain TGIC particles.

[0048] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A TGIC melt granulation device, comprising a steel belt granulator (3) for forming TGIC material particles, characterized in that: It also includes a melt mixing and stirring kettle (1), a melt pump (2), a vacuum pump (4), and a steam generator (5); The melt mixing stirring kettle (1) is provided with at least one feed pipe (6) connected with the interior thereof, and a first discharge pipe (16) is provided at the bottom of one end of the melt mixing stirring kettle (1); the kettle body of the melt mixing stirring kettle (1) is cylindrical in shape as a whole, and the kettle body of the melt mixing stirring kettle (1) is composed of an outer furnace body (101) and an inner furnace body (102) arranged inside the outer furnace body (101); a heating chamber is formed between the outer furnace body (101) and the inner furnace body (102); the interior of the inner furnace body (102) is a stirring chamber; at least ten return heat exchange tubes (11) are arranged on the outer wall of the inner furnace body (102) and are located around the heating chamber; and a second vacuum tube (12) is arranged on the inner top wall of the inner furnace body (102); The mixing stirring kettle (1) is provided with a stirring component; the steam outflow end of the steam generator (5) is connected to the inflow end of the heat exchange tube (11); the gas medium inflow end of the vacuum pump (4) is connected to one end of the second vacuum tube (12); the outflow end of the first discharge pipe (16) is connected to the feed port of the melt pump (2); and the material outflow end of the melt pump (2) is provided with a steel belt granulator (3).

2. The TGIC melt granulation device according to claim 1, characterized in that: The stirring component comprises a stirring shaft (13) and a plurality of stirring rods (14) located in the stirring chamber, one end of the stirring shaft (13) is rotatably connected to the inner wall of the kettle body, the other end of the stirring shaft (13) passes through the side wall of the kettle body, and each stirring rod (14) is fixedly mounted on the outer wall of the stirring shaft (13).

3. The TGIC melt granulation device according to claim 2, characterized in that: The stirring component further comprises a servo motor (7) and a reducer (8), and the output shaft of the servo motor (7) is coaxially connected to one end of the stirring shaft (13) through the reducer (8).

4. The TGIC melt granulation device according to claim 1, characterized in that: The material outflow end of the melt pump (2) is equipped with a material distributor in communication therewith, and the material outflow end port of the material distributor is located above the forming steel belt of the steel belt granulator (3).

5. The TGIC melt granulation device according to claim 1, characterized in that: The second vacuum tube (12) is provided with a plurality of through holes penetrating the wall thereof; a first vacuum tube (10) is installed at the gas medium inlet end of the vacuum pump (4); the vacuum pump (4) is connected to the second vacuum tube (12) via the first vacuum tube (10); and a gas tank is installed at the gas medium outlet end of the vacuum pump (4).

6. The TGIC melt granulation device according to claim 1, characterized in that: A pressure relief valve (15) is provided on the kettle body of the melting and mixing stirring kettle (1), and a temperature sensor is provided on the inner wall of the inner furnace body (102) of the melting and mixing stirring kettle (1).

7. The TGIC melt granulation device according to claim 1, characterized in that: It also comprises a control panel, which is respectively connected to the steel belt granulator (3), the melt pump (2), the vacuum pump (4), the steam generator (5) and the stirring component for control.

Images