Constant-temperature feeding assembly for preparing PU adhesive

Abstract

The utility model discloses a constant-temperature feeding assembly for preparing a PU (Poly Urethane) adhesive, relates to the technical field of adhesive preparation, and aims to solve the problem of slow feeding of raw materials in the preparation process of the PU adhesive, perform constant-temperature feeding and keep part of the raw materials which are greatly influenced by temperature stable, so that the product quality and the production efficiency are improved, and the production cost is reduced. According to the technical scheme, the constant-temperature feeding assembly for preparing the PU adhesive is characterized by comprising a reaction kettle and a constant-temperature feeding assembly body, the reaction kettle comprises a base, a kettle body, a support, a motor base, an explosion-proof motor, a direct feeding port and a discharging port, and the constant-temperature feeding assembly body comprises a heat preservation container, a heating part and a digital display part; the heat preservation container comprises a shell, a cover plate, a constant-temperature feeding port, a feeding pipe and a constant-temperature discharging port, the heating part comprises a constant-temperature controller, a semiconductor heating pipe, a temperature sensor and a temperature measuring rod, and the digital display part comprises a fixing base and a temperature display screen. The performance of the PU adhesive is prevented from being influenced by over-high temperature of the raw materials.

Description

Technical Field

[0001] The utility model relates to the technical field of adhesive preparation, in particular to a constant temperature feeding component for preparing PU adhesive. Background Art

[0002] PU adhesive is a high-molecular compound with high reactivity and polarity, primarily used for bonding a variety of materials. This adhesive contains carbamate (-NHCOO-) or isocyanate (-NCO) groups in its molecular chain, which gives it excellent chemical bonding strength and allows it to form strong chemical bonds with materials containing active hydrogen, such as porous materials like foam, plastic, wood, leather, fabric, paper, and ceramics, as well as materials with smooth surfaces like metal, glass, rubber, and plastic. PU adhesives come in two main categories: polyisocyanates and polyurethanes, and are environmentally friendly, featuring low VOC content, low or no environmental pollution, and being non-flammable. In addition, PU adhesives possess shear strength and impact resistance, making them suitable for various structural bonding applications. They also possess excellent flexibility and rubber properties, adapting to the bonding of substrates with different thermal expansion coefficients. They form a soft-hard transition layer between substrates, providing not only strong bonding but also excellent cushioning and shock absorption capabilities. PU adhesives surpass all other adhesive types in their low- and ultra-low-temperature performance.

[0003] Reaction temperature is an important control factor in the preparation of PU adhesives. ‌As the reaction temperature increases, the reaction rate of isocyanate and active hydrogen compounds accelerates, but too high a temperature may cause unstable chemical bonds to decompose, thereby affecting the performance of the adhesive. ‌‌ Generally, the reaction temperature of polyurethane reactions is between 80°C and 120°C. ‌When the reaction temperature is low, the reaction rate is slow, and a longer reaction time is required to complete the reaction. At the same time, side reactions are prone to occur, affecting the quality of the product. ‌On the contrary, when the reaction temperature is high, although the reaction rate is faster and the reaction time is shorter, excessive polymerization is also prone to occur, resulting in excessive cross-linking of the product, affecting its physical and chemical properties. ‌Therefore, choosing an appropriate reaction temperature is the key to ensuring the quality of PU adhesives. ‌

[0004] However, the raw material medium used in the preparation of PU adhesives has high viscosity, making it inconvenient to transport in low-temperature environments. In the existing PU adhesive preparation process, the raw materials cannot be heated during feeding, resulting in excessively high viscosity and slow feeding. In the existing PU adhesive preparation process, the raw materials cannot be kept at a constant temperature during feeding. If the temperature is too high, some of the raw materials are prone to decomposition at high temperatures, while if the temperature is too low, the reaction rate is affected, and it is impossible to select a suitable reaction temperature based on the characteristics of the raw materials. In the existing PU adhesive preparation process, the feed port is prone to raw material backlogs and clogging, making the preparation time-consuming and labor-intensive. Utility Model Content

[0005] The purpose of the utility model is to provide a constant temperature feeding assembly for the preparation of PU adhesive, which effectively improves the problem of slow raw material feeding during the preparation of PU adhesive, and performs constant temperature feeding to keep some raw materials that are more affected by temperature stable, thereby improving product quality and production efficiency.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] A constant temperature feeding assembly for preparing PU adhesive comprises a reactor and a constant temperature feeding assembly, wherein the constant temperature feeding assembly is arranged on the top of the reactor, the reactor comprises a base, a reactor body, a support, a motor seat, an explosion-proof motor, a direct feeding port and a discharging port, the reactor body is welded to the base, there are four supports, all of which are arranged in a circular array on the outside of the reactor body, a motor seat is fixed at the center of the top of the reactor body, the explosion-proof motor is connected to the stirring device inside the reactor body via the motor seat, the direct feeding port is arranged on the top surface of the reactor body, and the discharging port is welded to the front end of the bottom of the reactor body, the constant temperature feeding assembly comprises an insulation container, a heating part and a digital display part, the insulation container is arranged behind the motor, the bottom end of the insulation container is welded to the top surface of the reactor body, a heating part is arranged in the insulation container, the heating part is fixed on the top of the insulation container, the heating part is connected to the digital display part, and the digital display part is fixed on the top surface of the reactor body.

[0008] Furthermore, the thermal insulation container includes an outer shell, a cover, a constant temperature feed port, a feed pipe and a constant temperature discharge port. The outer shell is in the shape of a "hopper", the cover is clamped on the top of the outer shell, the front end of the cover is provided with a constant temperature feed port, a feed pipe is fixed in the constant temperature feed port, the feed pipe is inclined upward, the feed pipe is connected to the interior of the outer shell through the constant temperature feed port, the constant temperature discharge port is provided at the connection part between the bottom end of the thermal insulation container and the top of the kettle body, and the interior of the thermal insulation container and the interior of the kettle body are connected through the constant temperature discharge port.

[0009] Furthermore, the heating part includes a constant temperature controller, a semiconductor heating tube, a temperature sensor and a temperature measuring rod. The constant temperature controller is arranged at the top center of the cover plate, the semiconductor heating tube passes through the cover plate and is connected to the bottom of the constant temperature controller, the temperature sensor is arranged behind the constant temperature controller, the temperature sensor passes through the cover plate and is connected to the temperature measuring rod, the bottom of the temperature sensor is fixed on the cover plate, and the temperature sensor is connected to the constant temperature controller via an electric wire.

[0010] Furthermore, the digital display part includes a fixing seat and a temperature display screen. A fixing seat is welded on the top surface of the kettle body. The fixing seat is arranged at the left rear of the explosion-proof motor. The bottom end of the temperature display screen is clamped on the fixing seat. The temperature display screen is connected to the constant temperature controller via an electric wire.

[0011] In summary, the beneficial technical effects of the present invention are:

[0012] 1. The semiconductor heating tube is used to heat the raw materials during the feeding process, which improves the fluidity of the raw materials. The distribution of the raw materials after feeding is more uniform, ensuring the full progress of the reaction;

[0013] 2. A temperature measuring rod is selected to monitor the temperature of the raw materials in the feeding assembly in real time, and the heating temperature of the semiconductor heating tube is controlled by a constant temperature controller to prevent the raw materials from affecting the performance of the PU adhesive due to excessive temperature.

[0014] 3. The use of thermal insulation containers, which are in the shape of conical hoppers, reduces the running resistance during the discharge of raw materials, helps the natural flow of raw materials, and reduces blockage and retention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the reactor of the utility model;

[0017] Figure 3 This is a schematic diagram of the constant temperature feeding component of the utility model.

[0018] 1. Reactor; 2. Constant temperature feed assembly; 11. Base; 12. Reactor body; 13. Support; 14. Motor base; 15. Explosion-proof motor; 16. Direct feed port; 17. Discharge port; 21. Insulated container; 22. Heating unit; 23. Digital display unit; 211. Housing; 212. Cover; 213. Constant temperature feed port; 214. Feed pipe; 215. Constant temperature discharge port; 221. Constant temperature controller; 222. Semiconductor heating tube; 223. Temperature sensor; 224. Temperature measuring rod; 231. Fixing seat; 232. Temperature display screen. DETAILED DESCRIPTION

[0019] The present invention will be described in further detail below with reference to the accompanying drawings.

[0020] The utility model discloses a constant temperature feeding assembly for preparing PU adhesive, comprising a reactor 1 and a constant temperature feeding assembly 2, the constant temperature feeding assembly 2 being arranged on the top of the reactor 1, the reactor 1 comprising a base 11, a reactor body 12, a support 13, a motor seat 14, an explosion-proof motor 15, a direct feeding port 16 and a discharging port 17, the reactor body 12 being welded on the base 11, the support 13 having four, all of which are arranged in a circular array on the outside of the reactor body 12, the support 13 being an ear-type support 13, the structure being welded by two stiffening plates and a support leg, a pad being added between the stiffening plate and the reactor body 12 to improve the local stress of the support, the motor seat 14 being fixed to the center of the top of the reactor body 12, the explosion-proof motor 15, the direct feeding port 16 and the discharging port 17, the explosion-proof motor 15 The explosion-proof motor 15 is connected to the stirring device inside the kettle body 12 through the motor base 14. The motor base 14 is used to support and fix the explosion-proof motor 15, ensuring that the explosion-proof motor 15 and the stirring device maintain a certain concentricity during installation. It is also convenient for loading and unloading and maintenance. The explosion-proof motor 15 ensures that the equipment can operate safely in a flammable and explosive environment. The direct feed port 16 is set on the top surface of the kettle body 12. Raw materials can be added to the kettle body 12 for reaction through the direct feed port 16. It is used for feeding raw materials that do not require temperature control. The discharge port 17 is welded to the front end of the bottom of the kettle body 12. The reaction products in the preparation process of the PU adhesive are discharged from the reactor 1 through the discharge port 17. See Figure 1 、 Figure 2 .

[0021] In order to improve the production efficiency and product quality of PU adhesive, a constant temperature feeding component 2 is added to the reactor 1. The constant temperature feeding component 2 includes an insulation container 21, a heating part 22 and a digital display part 23. The insulation container 21 is arranged behind the motor, and the bottom end of the insulation container 21 is welded to the top surface of the kettle body 12. After the raw materials reach a certain temperature after passing through the insulation container 21, they enter the reactor 1. A heating part 22 is provided in the insulation container 21, and the heating part 22 is fixed on the top of the insulation container 21. The raw materials are heated and maintained at a constant temperature after passing through the heating part 22. The heating part 22 is connected to the digital display part 23, and the digital display part 23 is fixed on the top surface of the kettle body 12. The digital display part 23 displays the temperature of the raw materials inside the insulation container 21 in digital form, which is convenient for the staff to check the feeding temperature. The heat preservation container 21 includes an outer shell 211, a cover 212, a constant temperature feed port 213, a feed pipe 214 and a constant temperature discharge port 215. The outer shell 211 is in the shape of a "hopper". The cover 212 is clamped on the top of the outer shell 211. The inner sides of the outer shell 211 and the cover 212 are made of 304 stainless steel. This material is resistant to high temperature, corrosion and wear, and has excellent safety performance. The outer side is made of rock wool, which has excellent heat preservation performance, high temperature resistance and corrosion resistance. A constant temperature feed port 213 is provided at the front end of the cover 212. A feed pipe 214 is fixed in the constant temperature feed port 213. The material pipe 214 is detachable for easy cleaning. The feed pipe 214 is at an upward angle. The feed pipe 214 is connected to the interior of the shell 211 through the constant temperature feed port 213. The upward angle adopted by the feed pipe 214 facilitates the introduction of raw materials into the interior of the thermal insulation container 21. The constant temperature discharge port 215 is set at the connection between the bottom end of the thermal insulation container 21 and the top of the kettle body 12. The interior of the thermal insulation container 21 and the interior of the kettle body 12 are connected through the constant temperature discharge port 215. When the raw materials reach a constant temperature in the thermal insulation container 21, they enter the interior of the kettle body 12 from the constant temperature discharge port 215 for stirring.The heating part 22 includes a constant temperature controller 221, a semiconductor heating tube 222, a temperature sensor 223 and a temperature measuring rod 224. The constant temperature controller 221 is arranged at the top center of the cover plate 212. The semiconductor heating tube 222 passes through the cover plate 212 and is connected to the bottom of the constant temperature controller 221. The semiconductor heating tube 222 heats the raw materials during the feeding process, thereby improving the fluidity of the raw materials and making the distribution of the raw materials after feeding more uniform. The temperature of the semiconductor heating tube 222 is controlled by the constant temperature controller 221. The semiconductor heating tube 222 converts electrical energy into thermal energy at a rate of more than 90%. Compared with traditional heating elements, it can save energy and ensure that the temperature distribution of the heated object is uniform. It can work stably for a long time and is not prone to Fault, it has the characteristics of high heating efficiency, uniform heating, stable and reliable heating, which ensures the full progress of the reaction. The temperature sensor 223 is arranged behind the thermostat controller 221, and the temperature sensor 223 passes through the cover 212 to connect the temperature measuring rod 224. The bottom of the temperature sensor 223 is fixed on the cover 212. The temperature sensor 223 converts the temperature of the raw materials in the insulation container 21 into a usable output signal through the temperature measuring rod 224. The temperature sensor 223 is connected to the thermostat controller 221 via an electric wire. The temperature sensor 223 transmits the signal to the thermostat controller 221 via an electric wire. After receiving the temperature signal, the thermostat controller 221 controls the operation of the semiconductor heating tube 222 to prevent the raw materials from affecting the performance of the PU adhesive due to excessive temperature. The digital display unit 23 includes a fixing base 231 and a temperature display screen 232. The fixing base 231 is welded on the top surface of the kettle body 12. The fixing base 231 is arranged on the left rear of the explosion-proof motor 15. The bottom end of the temperature display screen 232 is clamped on the fixing base 231. The fixing base 231 fixes the temperature display screen 232 on the kettle body 12. The temperature display screen 232 is connected to the thermostat controller 221 via an electric wire. The temperature display screen 232 converts the temperature signal received by the thermostat controller 221 into a digital signal and displays the raw material temperature in digital form. The staff can monitor the temperature of the raw materials in the feeding assembly in real time, effectively keep the raw materials stable, and thereby improve the production efficiency and product quality of the PU adhesive. For details, see. Figure 3 .

[0022] Example

[0023] Operation process

[0024] 1. Open the cover 212 to confirm that the heating unit 22 can operate normally, then seal the cover 212 to the top of the housing 211 and connect the wires of the temperature display 232 to the thermostat controller 221;

[0025] 2. Turn on the power to the heating unit 22 and the digital display unit 23, and confirm that the temperature display screen 232 normally displays the temperature inside the heat preservation container 21;

[0026] 3. Turn on the explosion-proof motor 15 to start the reactor 1, and then seal the discharge port 17;

[0027] 4. Raw materials are introduced through the direct feed port 16. Raw materials that require a constant temperature are fed through the constant temperature feed port 213 and heated at a constant temperature by the heating unit 22;

[0028] 5. The heated raw materials enter the interior of the kettle body 12 through the constant temperature discharge port 215 to react with other raw materials. After the reaction is completed, the raw materials are discharged through the discharge port 17.

[0029] The embodiments of this specific implementation method are all preferred embodiments of the present utility model, and are not intended to limit the scope of protection of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the scope of protection of the present utility model.

Claims

1. A constant temperature feeding assembly for preparing a PU adhesive, comprising a reaction kettle (1) and a constant temperature feeding assembly (2), characterized in that: The constant temperature feeding assembly (2) is arranged on the top of the reactor (1). The reactor (1) comprises a base (11), a reactor body (12), a support (13), a motor base (14), an explosion-proof motor (15), a direct feeding port (16) and a discharge port (17). The reactor body (12) is welded to the base (11). There are four supports (13), which are arranged in a circular array outside the reactor body (12). A motor base (14) is fixed at the center of the top of the reactor body (12). The explosion-proof motor (15) is connected to the stirring device inside the reactor body (12) via the motor base (14). The direct feeding port (16) The thermostatic feeding assembly (2) is arranged on the top surface of the kettle body (12), the discharge port (17) is welded to the front end of the bottom of the kettle body (12), and the thermostatic feeding assembly (2) comprises a heat preservation container (21), a heating part (22) and a digital display part (23). The heat preservation container (21) is arranged behind the motor, the bottom end of the heat preservation container (21) is welded to the top surface of the kettle body (12), a heating part (22) is arranged in the heat preservation container (21), the heating part (22) is fixed to the top of the heat preservation container (21), the heating part (22) is connected to the digital display part (23), and the digital display part (23) is fixed to the top surface of the kettle body (12).

2. A constant temperature feeding assembly for preparing PU adhesive according to claim 1, characterized in that: The heat-insulating container (21) comprises an outer shell (211), a cover plate (212), a constant-temperature feed port (213), a feed pipe (214) and a constant-temperature discharge port (215); the outer shell (211) is in the shape of a "hopper"; the cover plate (212) is clamped on the top of the outer shell (211); a constant-temperature feed port (213) is provided at the front end of the cover plate (212); a feed pipe (214) is fixed inside the constant-temperature feed port (213); the feed pipe (214) is inclined upward; the feed pipe (214) communicates with the interior of the outer shell (211) through the constant-temperature feed port (213); the constant-temperature discharge port (215) is provided at the connection portion between the bottom end of the heat-insulating container (21) and the top of the kettle body (12); the interior of the heat-insulating container (21) and the interior of the kettle body (12) communicate through the constant-temperature discharge port (215).

3. The constant temperature feeding assembly for preparing PU adhesive according to claim 1, characterized in that: The heating part (22) comprises a constant temperature controller (221), a semiconductor heating tube (222), a temperature sensor (223) and a temperature measuring rod (224); the constant temperature controller (221) is arranged at the top center of the cover plate (212); the semiconductor heating tube (222) passes through the cover plate (212) and is connected to the bottom of the constant temperature controller (221); the temperature sensor (223) is arranged behind the constant temperature controller (221); the temperature sensor (223) passes through the cover plate (212) and is connected to the temperature measuring rod (224); the bottom of the temperature sensor (223) is fixed on the cover plate (212); and the temperature sensor (223) is connected to the constant temperature controller (221) via an electric wire.

4. The constant temperature feeding assembly for preparing PU adhesive according to claim 1, characterized in that: The digital display unit (23) includes a fixing seat (231) and a temperature display screen (232). The fixing seat (231) is welded on the top surface of the kettle body (12). The fixing seat (231) is arranged at the left rear of the explosion-proof motor (15). The bottom end of the temperature display screen (232) is clamped on the fixing seat (231). The temperature display screen (232) is connected to the constant temperature controller (221) via an electric wire.

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