Integrated foaming apparatus with polyurethane foam gradient loading of an aldehyde scavenger

Abstract

The utility model relates to polyurethane foam technical field discloses integrated foaming device of polyurethane foam gradient load aldehyde removal agent, including integrated foaming mixing pipe, the right -hand member fixedly connected with double -pass connecting pipeline of integrated foaming mixing pipe, the both ends of double -pass connecting pipeline are connected with feed pipe respectively, two storage tanks are provided with in the side of double -pass connecting pipeline, the liquid pump liquid end connection of feed pipe far from the both ends of double -pass connecting pipeline respectively with two storage tanks, two the storage tank is used for storing A material and B material respectively, the inside equal interval misregistration of integrated foaming mixing pipe is installed with a plurality of mixed flow guide plate, for the sufficient mixing of A material and B material, the left -hand member fixedly connected with connecting pipeline of integrated foaming mixing pipe, and the device need not additional aldehyde removal agent load procedure, realize mixing, foaming and gradient load integration, guarantee foam aldehyde removal uniformity and structural stability.

Description

Technical Field

[0001] This application belongs to the field of polyurethane foam technology, specifically an integrated foaming device for polyurethane foam gradient loading of formaldehyde removal agent. Background Technology

[0002] Polyurethane foam is a porous polymer material made from isocyanate and polyol as the main raw materials through chemical reaction. It has excellent properties such as light weight, heat insulation, sound absorption and shock absorption. It is widely used in building insulation, home decoration, automotive interior, packaging cushioning and other fields. With the increasing attention to indoor air quality, some polyurethane foam is also used in air purification-related scenarios, such as as a filter carrier or interior decoration material to help remove formaldehyde.

[0003] To address the demand for formaldehyde pollution control and improve formaldehyde removal efficiency while reducing costs, polyurethane foam needs to be loaded with formaldehyde removal agents. Gradient loading of formaldehyde removal agents is a superior loading method. By allowing the formaldehyde removal agent to present a concentration gradient distribution in the foam (such as high concentration on the surface, low concentration inside, or high concentration in specific areas), it is possible to ensure rapid adsorption of formaldehyde on the surface while achieving long-term purification by utilizing the low concentration of formaldehyde removal agent inside. This avoids the problems of insufficient formaldehyde removal capacity in the early stage or waste of resources in the later stage caused by single concentration loading.

[0004] However, in reality, the foaming process of polyurethane foam is mainly divided into intermittent molding foaming and continuous board foaming. In the intermittent process, A material (isocyanate) and B material (polyol, foaming agent, catalyst, etc.) are usually delivered to the mixing head by a metering pump in proportion. After being quickly mixed in the mixing head, they are injected into the mold. The materials undergo a polymerization reaction in the mold and release gas to form foam. After curing, the product is demolded. In the continuous process, the mixed materials are continuously sprayed onto a moving conveyor belt through a nozzle. After foaming, curing, and cutting, continuous foam boards are formed.

[0005] However, in the actual production of polyurethane foam, the mixing of materials A and B is often uneven due to factors such as fluctuations in the flow rate of the metering pump and uneven shear force inside the mixing head, or improper control of the reaction rate of the foaming agent and catalyst, resulting in different foam cell sizes and uneven densities, which further affects the adsorption and diffusion effect of the formaldehyde removal agent. Therefore, an integrated foaming device for polyurethane foam with gradient loading of formaldehyde removal agent is provided. Utility Model Content

[0006] The purpose of this application is to provide an integrated foaming device for polyurethane foam gradient loading of formaldehyde removal agent in order to solve the problems mentioned above.

[0007] The technical solution adopted in this application is as follows: an integrated foaming device for polyurethane foam gradient loading formaldehyde removal agent, including an integrated foaming mixing pipe, a double-pass connecting pipe fixedly connected to the right end of the integrated foaming mixing pipe, a feeding pipe connected to both ends of the double-pass connecting pipe, two storage tanks arranged beside the double-pass connecting pipe, and the end of the feeding pipe away from the double-pass connecting pipe connected to the liquid pump outlet of the two storage tanks respectively, and the two storage tanks are used to store material A and material B respectively;

[0008] The integrated foaming mixing tube has multiple mixing guide plates installed at equal intervals and staggered inside for thorough mixing of material A and material B. A connecting pipe is fixedly connected to the left end of the integrated foaming mixing tube, and a discharge pipe is fixedly installed at the bottom end of the connecting pipe. A U-shaped fixing plate is correspondingly set at the bottom end of the discharge pipe, and the outer wall of the discharge pipe is fixedly connected to the top surface of the U-shaped fixing plate. A conveyor belt support is set on the bottom surface of the U-shaped fixing plate, and the bottom surface of the U-shaped fixing plate is fixedly installed on the top surface of the conveyor belt support. A central drain pipe is fixed at the bottom end of the discharge pipe. Multiple mixing nozzles are arranged in a circumferential array on the outer surface of the portion of the central drain pipe located inside the U-shaped fixing plate. The multiple mixing nozzles are connected to external formaldehyde removal agent supply pipes of different concentrations through independent connecting supply pipes. A discharge nozzle is installed at the bottom end of the central drain pipe.

[0009] In a preferred embodiment, the integrated foaming mixing pipe and the double-through connecting pipe are fixed by bolt one, and the integrated foaming mixing pipe and the connecting pipe are fixed by bolt two.

[0010] In a preferred embodiment, a flow meter is installed at the end of the connecting pipe away from the integrated foaming mixing pipe, and the monitoring end of the flow meter extends into the interior of the connecting pipe to monitor the flow rate of the mixed material.

[0011] In a preferred embodiment, the mixing guide plate is a spiral guide plate, and the spiral directions of two adjacent mixing guide plates are opposite.

[0012] In a preferred embodiment, the spray direction of the mixing nozzle is at an angle of 30°-45° to the axis of the central drain pipe, and the spray flow rate of each mixing nozzle is independently adjustable.

[0013] In summary, due to the adoption of the above technical solution, the beneficial effects of this application are:

[0014] 1. In this application, due to the adoption of the above-mentioned scheme, after the raw materials enter the mixing pipe, they are divided into multiple sub-flows and twisted and mixed under the action of the reverse spiral mixing guide plate. Uniform mixing is achieved through strong shear force and turbulence effect. After mixing, the material is transported to the discharge pipe through the left end connecting pipe. After the mixed material enters the discharge pipe, it flows to the bottom central drain pipe. At the same time, different concentrations of formaldehyde removal agents from the outside are transported to each mixing nozzle through independent connecting supply pipes. The flow rate of each nozzle is adjusted according to the preset gradient requirements. The formaldehyde removal agent is sprayed into the central drain pipe at a specific angle and quickly mixed with the mixed material to form a polyurethane raw material mixing system containing gradient formaldehyde removal agent. This mixing system is discharged from the nozzle at the bottom of the central drain pipe and accurately injected into the mold conveyed on the conveyor belt support. The mold moves with the conveyor belt to the subsequent curing area. The mixing system undergoes a polymerization reaction and releases gas in the mold, gradually foaming and forming a polyurethane foam product with gradient formaldehyde removal performance. This device does not require an additional formaldehyde removal agent loading process, realizing the integration of mixing, foaming and gradient loading, ensuring the uniformity of foam formaldehyde removal and structural stability. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this application;

[0016] Figure 2 This is a schematic diagram of the connecting pipe structure of this application;

[0017] Figure 3 This is a schematic diagram of the hybrid nozzle structure of this application;

[0018] Figure 4 This is a schematic diagram of the hybrid guide vane structure of this application.

[0019] The markings in the diagram are: 1. Integrated foaming mixing pipe; 2. Connecting pipe; 3. Discharge pipe; 4. Conveyor belt support; 5. U-shaped fixing plate; 6. Central drain mixing tank pipe; 7. Mixing nozzle; 8. Connecting supply pipe; 9. Double-connecting pipe; 10. Storage tank; 11. Supply pipe; 12. Mixing guide plate; 13. Flow meter; 14. Discharge nozzle. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] refer to Figures 1-4As shown, the integrated foaming device for polyurethane foam gradient loading formaldehyde removal agent includes an integrated foaming mixing pipe 1. The right end of the integrated foaming mixing pipe 1 is fixedly connected to a double-pass connecting pipe 9. The integrated foaming mixing pipe 1 and the double-pass connecting pipe 9 are fixed by bolts. By using bolts for detachable fixing, it is convenient to disassemble and maintain the double-pass connecting pipe 9 or the integrated foaming mixing pipe 1 in the later stage (such as cleaning the inner wall of the pipe and replacing parts), avoiding maintenance difficulties caused by fixed connection. On the other hand, different specifications of double-pass connecting pipe 9 can be replaced according to production needs (such as adapting to different diameter supply pipes 11), improving the versatility and adaptability of the device.

[0022] refer to Figures 1-4 As shown, the two ends of the double-connecting pipe 9 are respectively connected to the feeding pipe 11. Two storage tanks 10 are set on the side of the double-connecting pipe 9. The end of the feeding pipe 11 away from the double-connecting pipe 9 is connected to the liquid pump outlet of the two storage tanks 10 respectively. The two storage tanks 10 are used to store material A and material B respectively. By setting up independent storage tanks 10 to store material A (isocyanate) and material B (polyol, etc.) respectively, the pre-reaction problem caused by the two raw materials coming into contact in advance can be avoided, ensuring the activity of the raw materials. At the same time, by setting up the feeding pipe 11 directly connected to the liquid pump, the amount of raw material delivered can be precisely controlled by the liquid pump (such as adjusting the ratio of material A and material B according to production needs).

[0023] refer to Figures 1-4 As shown, multiple mixing guide plates 12 are installed inside the integrated foaming mixing pipe 1 at equal intervals and staggered positions for thorough mixing of material A and material B. The mixing guide plates 12 are spiral guide plates, and the spiral directions of adjacent mixing guide plates 12 are opposite. By adapting the spiral guide plates to the inner wall of the integrated foaming mixing pipe 1, when material A and material B enter the pipe, they will be divided into multiple sub-flows by the spiral structure. Furthermore, adjacent opposite spiral guide plates can cause the sub-flows to twist 180° and cross-mix, which greatly enhances the shear force and turbulence effect, and avoids the defects of uneven foam cell size and density caused by insufficient mixing.

[0024] refer to Figures 1-4As shown, the left end of the integrated foaming mixing tube 1 is fixedly connected to the connecting pipe 2. The integrated foaming mixing tube 1 and the connecting pipe 2 are fixed by bolt two. A flow meter 13 is installed at the end of the connecting pipe 2 away from the integrated foaming mixing tube 1. The monitoring end of the flow meter 13 extends into the interior of the connecting pipe 2 to monitor the flow rate of the mixed material. The detachable design of bolt two works in conjunction with bolt one to facilitate the disassembly, cleaning or replacement of the connecting pipe 2. At the same time, the flow meter 13 monitors the flow rate of the mixed material in real time and can promptly provide feedback on whether the material delivery is stable (such as triggering an alarm when the flow is abnormal, reminding the operator to adjust the liquid pump parameters), avoiding insufficient or excessive material supply during subsequent foaming due to flow fluctuations, and ensuring the continuity and stability of the foaming process.

[0025] refer to Figures 1-4 As shown, a discharge pipe 3 is fixedly installed at the bottom of the connecting pipe 2. A U-shaped fixing plate 5 is correspondingly provided at the bottom of the discharge pipe 3, and the outer wall of the discharge pipe 3 is fixedly connected to the top surface of the U-shaped fixing plate 5. A conveyor belt support 4 is provided on the bottom surface of the U-shaped fixing plate 5, and the bottom surface of the U-shaped fixing plate 5 is fixedly installed on the top surface of the conveyor belt support 4. The U-shaped fixing plate 5 provides stable support for the discharge pipe 3 and the central drain pipe 6, preventing the pipe from shifting due to its own weight or material impact, ensuring accurate injection of subsequent materials into the mold. Combined with the stable support of the conveyor belt support 4, it further improves the stability of the overall structure of the device and provides reliable space guarantee for foaming molding.

[0026] refer to Figures 1-4 As shown, a central drain pipe 6 is fixed to the bottom of the discharge pipe 3. Multiple mixing nozzles 7 are arranged in a circular array on the outer surface of the portion of the central drain pipe 6 located within the U-shaped fixing plate 5. Each mixing nozzle 7 is connected to an external supply pipe for formaldehyde removal agents of different concentrations via an independent supply pipe 8. The spray direction of each mixing nozzle 7 forms an angle of 30°-45° with the axis of the central drain pipe 6, and the spray flow rate of each mixing nozzle 7 is independently adjustable. A discharge nozzle 14 is installed at the bottom of the central drain pipe 6. The multiple mixing nozzles 7 facilitate the use of different concentrations of formaldehyde removal agents, and their independently adjustable flow rates allow for adjustments based on... The system precisely controls the injection volume of formaldehyde removal agents at various concentrations (e.g., high concentration on the surface and low concentration in the inner layer) to achieve a gradient load of formaldehyde removal agents. This solves the problems of insufficient formaldehyde removal capacity in the early stage or waste of resources in the later stage caused by traditional single-concentration loading. By setting a spray angle of 30°-45°, the formaldehyde removal agent can form efficient convection mixing with the mixture in the central drain pipe 6, avoiding agglomeration of the formaldehyde removal agent and ensuring uniform gradient distribution. The spray range can be adjusted according to the mold size through the set discharge nozzle 14, so as to accurately inject the mixed raw materials and gradient formaldehyde removal agents into the mold, ensuring the formaldehyde removal performance and structural integrity of the foam after foaming.

[0027] The implementation principle of the integrated foaming device for polyurethane foam gradient loading formaldehyde removal agent in this application is as follows: Material A and Material B are stored in two storage tanks 10 respectively. The liquid pump on the storage tank 10 is started, and the liquid pump delivers the raw materials to the double-connecting pipe 9 through the feeding pipe 11 according to a preset ratio (e.g., Material A: Material B = 1:1.2). The double-connecting pipe 9 merges the two raw materials and introduces them into the integrated foaming mixing pipe 1. At this time, after Material A and Material B enter the integrated foaming mixing pipe 1, they are divided into multiple sub-flows and undergo torsional mixing under the action of the internally staggered counter-spiral mixing guide plates 12. Uniform mixing is achieved through strong shear force and turbulence effect. The mixed material is then transported to the discharge pipe 3 through the left-end connecting pipe 2. During this process, the flow meter 13 monitors the material flow rate in real time to ensure stable conveying. The mixed material enters the discharge pipe. After step 3, the liquid flows to the central drain pipe 6 at the bottom. At the same time, formaldehyde removal agents of different concentrations are delivered to each mixing nozzle 7 through independent connecting supply pipes 8. The flow rate of each nozzle is adjusted according to the preset gradient requirements. The formaldehyde removal agent is sprayed into the central drain pipe 6 at an angle of 30°-45° and quickly mixed with the mixed materials to form a mixed system of gradient formaldehyde removal agent and polyurethane raw materials. At this time, the mixed system containing gradient formaldehyde removal agent is accurately injected into the mold conveyed on the conveyor belt support 4 through the discharge nozzle 14 at the bottom of the central drain pipe 6. The mold moves with the conveyor belt to the subsequent curing area. The mixed system undergoes a polymerization reaction and releases gas in the mold, gradually foaming and forming a polyurethane foam product with gradient formaldehyde removal performance. This device does not require an additional formaldehyde removal agent loading process, realizing the integration of mixing, foaming gradient loading, and ensuring the uniformity of formaldehyde removal and structural stability of the foam.

[0028] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. An integrated foaming device for polyurethane foam gradient loading formaldehyde removal agent, comprising an integrated foaming mixing tube (1), characterized in that: The right end of the integrated foaming mixing pipe (1) is fixedly connected to a double-pass connecting pipe (9). Both ends of the double-pass connecting pipe (9) are respectively connected to a feeding pipe (11). Two storage tanks (10) are arranged on the side of the double-pass connecting pipe (9). The end of the feeding pipe (11) away from the double-pass connecting pipe (9) is respectively connected to the liquid pump outlet of the two storage tanks (10). The two storage tanks (10) are respectively used to store material A and material B. The integrated foaming mixing pipe (1) has multiple mixing guide plates (12) installed at equal intervals inside for fully mixing material A and material B. The left end of the integrated foaming mixing pipe (1) is fixedly connected to a connecting pipe (2), and the bottom end of the connecting pipe (2) is fixedly installed with a discharge pipe (3). The bottom end of the discharge pipe (3) is correspondingly provided with a U-shaped fixing plate (5), and the outer wall of the discharge pipe (3) is fixedly connected to the top surface of the U-shaped fixing plate (5). The bottom surface of the U-shaped fixing plate (5) is provided with a conveying device. With bracket (4), the bottom surface of the U-shaped fixing plate (5) is fixedly installed on the top surface of the conveyor belt bracket (4), and the bottom end of the discharge pipe (3) is fixed with a central drain pipe (6). The outer surface of the part of the central drain pipe (6) located inside the U-shaped fixing plate (5) is arranged in a circular array with multiple mixing nozzles (7). The multiple mixing nozzles (7) are respectively connected to external formaldehyde removal agent supply pipes of different concentrations through independent connecting supply pipes (8). The bottom end of the central drain pipe (6) is equipped with a discharge nozzle (14).

2. The integrated foaming device for polyurethane foam gradient loading formaldehyde removal agent as described in claim 1, characterized in that: The integrated foamed mixing pipe (1) and the double-through connecting pipe (9) are fixed by bolt one, and the integrated foamed mixing pipe (1) and the connecting pipe (2) are fixed by bolt two.

3. The integrated foaming device for polyurethane foam gradient loading formaldehyde removal agent as described in claim 1, characterized in that: A flow meter (13) is installed at the end of the connecting pipe (2) away from the integrated foaming mixing pipe (1). The monitoring end of the flow meter (13) extends into the connecting pipe (2) to monitor the flow rate of the mixed material.

4. The integrated foaming device for gradient-loaded formaldehyde removal agent in polyurethane foam as described in claim 1, characterized in that: The mixing guide plate (12) is a spiral guide plate, and the spiral directions of two adjacent mixing guide plates (12) are opposite.

5. The integrated foaming device for polyurethane foam gradient loading formaldehyde removal agent as described in claim 1, characterized in that: The spray direction of the mixing nozzle (7) is at an angle of 30°-45° to the axis of the central drain pipe (6), and the spray flow rate of each mixing nozzle (7) is independently adjustable.

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