A production process and equipment for composite polyurethane materials

Abstract

A production process and equipment for composite polyurethane materials, wherein the production process includes the following steps: pressure impregnation, discharging, leakage testing, test judgment, and baking. The present invention can not only quickly complete the double-sided coating of polyurethane materials with high coating effect; moreover, the coating effect of polyurethane materials can be reflected by the dripping speed, reducing the detection difficulty, with strong instantaneity, and the process can be adjusted according to the real-time detection results, ensuring that the finally obtained composite polyurethane materials have the advantages of good coating effect and strong stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of polyurethane material production, and particularly relates to a production process and equipment for composite polyurethane materials. Background Art

[0002] As a new type of composite material, composite reticulated silicone rubber polyurethane material is increasingly used in the home textile industry, such as pillow cores, mattress filling materials, etc. Compared with traditional reticulated polyurethane materials, the composite reticulated silicone rubber polyurethane material is prepared by a composite material preparation method of combining silicone rubber with reticulated polyurethane, and an elastic material with good rebound performance is obtained. Moreover, this material has good air permeability, washability and weather resistance, effectively solving the defects of existing polyurethane reticulated materials, such as pillow cores and mattress inner pads, which are not washable, not easy to clean thoroughly, and prone to bacterial growth.

[0003] The prior art generally prepares the composite reticulated silicone rubber polyurethane material by coating a glue layer on the reticulated polyurethane material. For example, the document with the application publication number CN116985449A discloses an automated production line preparation method for composite reticulated silicone rubber polyurethane material, and its process includes pretreatment, pre-compression, coating silicone liquid on the upper and lower surfaces, rolling pressure, baking, etc. By constructing a production line, the work efficiency is improved, and the penetration efficiency of the silicone liquid is improved by means of pre-compression and rolling pressure.

[0004] However, in this solution, there are still the following problems: First, the double-sided coating of the reticulated polyurethane material by this device requires two sets of coating equipment or a set of equipment for flipping the reticulated polyurethane material, and the equipment cost is relatively high. Moreover, when using the flipping equipment, the applicable object is limited to block-shaped reticulated polyurethane materials; Second, it is impossible to judge the coating situation of the silicone liquid during the production process.

[0005] Therefore, the inventor of the present invention has proposed a production process for composite polyurethane materials and the equipment for realizing this production process to solve the above technical problems. Summary of the Invention

[0006] Aiming at the above existing problems, one of the purposes of the present invention is to provide a production process for composite polyurethane materials, which can not only quickly complete the double-sided coating of polyurethane materials with high coating effect, but also reflect the coating effect of polyurethane materials through the dropping speed, reducing the detection difficulty, with strong instantaneity, and can adjust the process according to the real-time detection results to ensure that the finally obtained composite polyurethane material has the advantages of good coating effect and strong stability.

[0007] To achieve the above purpose, the technical solution of the present invention is as follows: A production process for composite polyurethane materials includes the following steps:

[0008] Pressurized impregnation: Feed the raw materials into the glue bucket filled with silica gel liquid for impregnation, and perform rolling pressure on the raw materials through at least a pair of pressure rollers in the glue bucket to obtain impregnated materials;

[0009] Discharging: Output the impregnated materials from the discharge port of the glue bucket, and lift the impregnated materials through the transmission component so that the impregnated materials form an angle of 20° - 70° with the side wall of the glue bucket;

[0010] Leakage test: Inject the test liquid at the angle formed by the impregnated materials and the side wall of the glue bucket for leakage test;

[0011] Test judgment: If the leakage test is qualified, the transmission component transports the impregnated materials in the original direction; if the leakage test is unqualified, the transmission component transports in the direction opposite to the original direction, and inputs the impregnated materials from the discharge port of the glue bucket into the glue bucket for re - impregnation treatment;

[0012] Baking: Bake the qualified impregnated materials to obtain the finished products.

[0013] As a further preference of the present invention, the test liquid is silica gel liquid.

[0014] As a further preference of the present invention, the leakage test includes: detecting the dripping speed of the test liquid at the impregnated materials.

[0015] As a further preference of the present invention, the leakage test is qualified when: the dripping speed of the test liquid at the impregnated materials is less than or equal to 1 drop / second.

[0016] The second object of the present invention is to provide a device applicable to the production process of composite polyurethane materials, including a glue bucket, a feed port provided at the upper end of the glue bucket, a discharge port provided on the side wall at the lower end of the glue bucket, a receiving box provided on the side end of the glue bucket where the discharge port is located, a first feeding roller provided at the feed port, a second feeding roller provided at the discharge port, at least one set of pressing rollers provided in the glue bucket, at least one transmission roller provided at the end of the receiving box far from the glue bucket and with a height in the vertical direction greater than the height of the discharge port, and a drying device provided on the side end of the receiving box where the transmission roller is installed.

[0017] As a further preference of the present invention, the receiving box includes a box body connected to the side wall of the glue bucket and with an open upper end, a return liquid pipe provided at the lower end of the box body, and a recovery structure provided outside the box body and connected to the return liquid pipe.

[0018] As a further preference of the present invention, the receiving box further includes a partition vertical plate disposed on the inner bottom surface of the box body, an adjusting vertical plate slidably connected to the upper end of the partition vertical plate, a top wheel disposed at the upper end of the adjusting vertical plate for supporting the impregnation treatment material, and a driving structure disposed on the box body for driving the adjusting vertical plate to rise / fall.

[0019] As a further preference of the present invention, the height of the top wheel in the vertical direction is less than the height of the transmission roller.

[0020] As a further preference of the present invention, the second material conveying roller includes an upper roller body and a lower roller body rotatably disposed on the discharge port and distributed vertically up and down, and a liquid outlet disposed on the roller surface of the upper roller body for flowing out the silicone liquid.

[0021] As a further preference of the present invention, a partition plate for forming a dust removal chamber is disposed in the glue liquid bucket at the lower end of the feed port, and a dust removal port matching the feed port is disposed on the partition plate; a dust removal fan communicating with the dust removal chamber is disposed on the side wall of the glue liquid bucket. Description of the Drawings

[0022] Appendix Figure 1 is a process flow schematic diagram of the present invention.

[0023] Appendix Figure 2 is a schematic structural diagram of the present invention from the front view angle.

[0024] Appendix Figure 3 is a schematic structural diagram of the glue liquid bucket and the receiving box of the present invention from the front view angle.

[0025] Appendix Figure 4 is a schematic partial structural diagram of the glue liquid bucket of the present invention from the side view angle.

[0026] Description of the Drawings: Glue liquid bucket 1, receiving box 2, first material conveying roller 3, second material conveying roller 4, pressing roller 5, transmission roller 6, drying device 7;

[0027] Feed port 11, discharge port 12, partition plate 13, dust removal fan 14;

[0028] Dust removal port 131;

[0029] Box body 21, return liquid pipe 22, recovery structure 23, partition vertical plate 24, adjusting vertical plate 25, top wheel 26, driving structure 27;

[0030] Recovery bucket 231, conveying pipe 232, pump body 233, infusion pipe 234;

[0031] Track 271, moving plate 272, sealing plate 273, motor 274, guide rod 275, limit hole 276, strip groove 277, limit block 278, sealing layer 279;

[0032] Upper roller body 41, lower roller body 42, liquid outlet 43. Specific embodiments

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the invention is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, terms such as "set" and "connect" should be understood in a broad sense. For example, "connect" 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 an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] The present invention provides a production process for composite polyurethane materials, as shown in the attached Figure 1 figures, and the process includes:

[0036] Pressing impregnation: Input the raw materials into the glue bucket filled with silica gel liquid for impregnation, and roll and press the raw materials through at least a pair of pressure rollers in the glue bucket to obtain impregnated materials;

[0037] Discharging: Output the impregnated materials from the discharge port of the glue bucket, and lift the impregnated materials through the transmission component so that the impregnated materials form an angle of 20° - 70° with the side wall of the glue bucket;

[0038] Leakage test: Inject the test liquid at the angle formed by the impregnated materials and the side wall of the glue bucket for leakage test;

[0039] Test judgment: If the leakage test is qualified, the transmission component continues to transport the impregnated materials; if the leakage test is unqualified, the transmission component transports in the reverse direction, and inputs the impregnated materials from the discharge port of the glue bucket into the glue bucket for re-impregnation treatment;

[0040] Baking: Bake the qualified impregnated materials to obtain the finished products.

[0041] Among them, the test liquid is silica gel liquid; the liquid leakage test includes: detecting the dripping speed of the test liquid at the impregnated treatment material; the qualified liquid leakage test is: the dripping speed of the test liquid at the impregnated treatment material is less than or equal to 1 drop / second; on the contrary, the unqualified liquid leakage test is: the dripping speed of the test liquid at the impregnated treatment material is greater than 1 drop / second. When the result is unqualified, repeat the liquid leakage test and the test judgment step until the test is qualified.

[0042] It should be noted that the purpose of the production process of the composite polyurethane material provided by the present invention is, firstly, to improve the coating efficiency of the silica gel liquid on both sides of the polyurethane material, and secondly, to immediately judge the coating situation of the silica gel liquid on the polyurethane material during the production process, and immediately control the process to ensure a good coating effect on the surface of the polyurethane material.

[0043] For the first purpose, the present invention first injects silica gel liquid into a relatively airtight glue bucket, and at least ensures that the silica gel liquid can submerge the raw material when the raw material is input to the deepest part of the glue bucket. At the same time, a pressure roller is used to roll and press the raw material to promote the penetration of the silica gel liquid into the raw material and improve the coating effect.

[0044] For the second purpose, the present invention uses a transmission component to lift the raw material and form an angle of 20° to 70° with the side wall of the glue bucket. The silica gel liquid flows out of the glue bucket along with the raw material at the discharge port of the glue bucket. At this time, since a certain amount of silica gel liquid has been coated on the surface of the polyurethane material, the impregnated treatment material will have the characteristics of "breathable and weak water permeability" at this time, and the water permeability decreases as the coating amount of the silica gel liquid increases. At the same time, the silica gel liquid has the characteristic of strong fluidity. Therefore, the inventor cleverly uses the silica gel liquid that flows out of the discharge port along with the output of the impregnated treatment material and flows to the upper surface of the impregnated treatment material, and judges the coating effect of the silica gel liquid by observing the penetration speed of the silica gel liquid on the upper surface of the impregnated treatment material into the impregnated treatment material. And for the convenience of observation, the acute angle between the impregnated treatment material and the side wall of the glue bucket can raise the water level of the silica gel liquid at the upper surface of the impregnated treatment material, so that the silica gel liquid is concentrated at the angle, and the dripping speed of the liquid at the lower surface of the impregnated treatment material is observed within a suitable time period (it is necessary to exclude the situation of excessive dripping of the silica gel liquid on the lower surface of the impregnated treatment material at the initial stage of output), and judge the coating degree of the silica gel liquid based on this. And, through multiple experiments, the inventor found that after excluding interference factors, when the dripping speed is greater than 1 drop / second, the quality of the final composite material is poor. Therefore, controlling the dripping speed within 1 drop / second can ensure the final quality of the composite material.

[0045] It can be understood that the silicone liquid described in the present invention can directly adopt a commercially available AB silicone type, and this silicone liquid is generally obtained by mixing raw material A and raw material B; the transmission component can directly adopt an existing conveyor roller group structure, and the conveyor roller group structure can control the transmission speed through a controller, thereby flexibly adjusting the process of the raw material; the controller is a commonly used control system in the art, so it will not be elaborated in this embodiment.

[0046] Therefore, compared with the prior art, the advantages of the production process of the present invention include: First, it can quickly complete the double-sided coating of the polyurethane material, and the coating effect is high; Second, the coating effect of the polyurethane material is reflected by the dropping speed, which reduces the detection difficulty and has strong immediacy. The process can be adjusted according to the real-time detection results to ensure that the finally obtained composite polyurethane material has the advantages of good coating effect and strong stability.

[0047] The present invention also provides a device suitable for the above production process, as shown in Figure 2 ~ Figure 4 shown, including a glue liquid bucket 1, a feed port 11 arranged at the upper end of the glue liquid bucket 1 and a discharge port 12 arranged on the side wall at the lower end of the glue liquid bucket 1, a receiving box 2 arranged at the side end of the glue liquid bucket 1 where the discharge port 12 is located, a first feeding roller 3 arranged at the feed port 11, a second feeding roller 4 arranged at the discharge port 12, at least one set of pressing rollers 5 arranged in the glue liquid bucket 1, at least one transmission roller 6 arranged at the end of the receiving box 2 far from the glue liquid bucket 1 and with a height in the vertical direction greater than the height of the discharge port 12, and a drying device 7 arranged on the side end of the receiving box 2 where the transmission roller 6 is installed.

[0048] Preferably, a partition 13 for forming a dust removal chamber is arranged in the glue liquid bucket 1 at the lower end of the feed port 11. A dust removal port 131 matching the feed port 11 is arranged on the partition 13, and bristles are arranged at the dust removal port 131; a dust removal fan 14 communicating with the dust removal chamber is arranged on the side wall of the glue liquid bucket 1. Such a setting can remove the dust adhered to the raw material, and guide wheels can also be arranged at the dust removal port 131 and the feed port 11 to avoid the situation that the raw material is distorted and folded due to the wind force. An inclined surface can be arranged on the inner bottom surface of the glue liquid bucket 1, which can not only reduce the amount of silicone liquid used, but also ensure that the silicone liquid is concentrated near the discharge port 12, and cooperate with the rolling of the pressing roller 5 to promote the coating effect. The pressing roller 5 is composed of two relatively arranged roller bodies, and the roller surfaces of the two roller bodies are in contact with a certain pressure to ensure the pressing effect on the raw material. At least one of the two roller bodies is connected to an external power structure to drive its active rotation, and the purpose of adjustable rotation speed and rotation direction is achieved. The transmission roller 6 and the drying device 7 are commonly used structures in the art, so they will not be elaborated in this embodiment.

[0049] In this embodiment, the receiving box 2 includes a box body 21 connected to the side wall of the glue bucket 1 and having an open upper end, a liquid return pipe 22 provided at the lower end of the box body 21, and a recovery structure 23 provided outside the box body 21 and connected to the liquid return pipe 22. Among them, the box body 21 is used to collect the silicone liquid flowing out with the output of the raw material and the silicone liquid dripping from the raw material, and the liquid return pipe 22 is used to recycle the silicone liquid at the bottom of the box body 21 to the recovery structure 23 for recycling.

[0050] Furthermore, the receiving box 2 further includes a partition vertical plate 24 provided on the inner bottom surface of the box body 21, an adjusting vertical plate 25 slidably connected to the upper end of the partition vertical plate 24, a top wheel 26 provided at the upper end of the adjusting vertical plate 25 for supporting the impregnation treatment material, and a driving structure 27 provided on the box body 21 for driving the adjusting vertical plate 25 to rise / fall.

[0051] Among them, the partition vertical plate 24 is fixedly installed inside the box body 21 and divides the inside of the box body 21 into a recovery cavity close to the glue bucket 1. The recovery cavity can raise the water level of the recycled silicone liquid, thereby improving the recovery effect; the adjusting vertical plate 25 cooperates with the top wheel 26 to further support the raw material output from the glue bucket 1 by controlling the height of the top wheel 26, and the top wheel 26 can quickly control and fix the angle of the included angle by lifting the lower surface of the raw material (the height of the top wheel 26 in the vertical direction is generally less than the height of the transmission roller 6). The top wheel 26 is rotatably connected to the adjusting vertical plate 25 and is preferably a passive wheel.

[0052] As a preference, the recovery structure 23 includes a recovery bucket 231 provided on the side wall of the glue bucket 1, a delivery pipe 232 for connecting the recovery bucket 231 and the liquid return pipe 22, a pump body 233 provided on the delivery pipe 232, and an infusion pipe 234 provided on the recovery bucket 231 and connected to the glue bucket 1.

[0053] As a preferred embodiment, the driving structure 27 includes a track 271 arranged on the side wall of the box body 21, a moving plate 272 arranged at the lower end of the adjusting vertical plate 25 and slidably connected to the track 271, a sealing plate 273 arranged at the end of the moving plate 272 away from the adjusting vertical plate 25 and used to close the track 271, and a motor 274 arranged on the box body 21 and connected to the sealing plate 273 at the output end. The track 271 is a vertical track for connecting the box body 21 with the outside; one end of the moving plate 272 is connected to the lower end of the adjusting vertical plate 25, and the other end passes through the track 271 and extends to the outside of the box body 21; the sealing plate 273 is a plate parallel to the side wall of the box body 21, and the sealing plate 273 can completely cover the track 271, and when the sealing plate 273 is driven by the motor 274 to rise and fall, the track 271 will not be exposed, thereby preventing impurities from entering the box body 21.

[0054] More preferably, the driving structure 27 further includes a guide rod 275 disposed in the track 271, a limiting hole 276 disposed on the moving plate 272 and used to pass through the guide rod 275, a strip groove 277 disposed on the side wall of the partitioning vertical plate 24, a limiting block 278 disposed at the side end of the adjusting vertical plate 25 and slidably connected to the strip groove 277, and a sealing layer 279 disposed on the surface of the sealing plate 273. The sliding connection between the guide rod 275 and the limiting hole 276, and the sliding connection between the limiting block 278 and the strip groove 277 are intended to enhance the stability of the movement of the two ends of the moving plate 272, and the stability of the connection between the adjusting vertical plate 25 and the partitioning vertical plate 24, so as to improve the accuracy of controlling the lifting and lowering of the top wheel 26.

[0055] In this embodiment, the second feed roller 4 includes an upper roller body 41 and a lower roller body 42 which are rotatably arranged on the discharge port 12 and are distributed up and down in the vertical direction, and a liquid outlet 43 which is arranged on the roller surface of the upper roller body 41 for the silicone liquid to flow out. Among them, it is necessary to control the gap between the upper roller body 41 and the lower roller body 42 and the discharge port 12 after installation. The control method can be to arrange an elastic layer on the roller surface of the upper roller body 41 and the lower roller body 42, or other existing methods; in this way, the outflow of the silicone liquid at the discharge port 12 can be reduced as much as possible; and the liquid outlet 43 is to allow the silicone liquid to stably flow out from the glue barrel to the upper surface of the raw material, thereby ensuring the smooth progress of the leakage test. Moreover, since the dripping speed is slow, the state that is likely to be reached is that when the silicone liquid flows out from the liquid outlet 43 and reaches a certain water level, it reaches a balance with the pressure on the inner and outer sides of the discharge port 12. At this time, the silicone liquid will not continue to flow out from the liquid outlet 43. Combined with the recycling of the silicone liquid, the amount of silicone liquid used is not large and controllable, and it is both practical and economical.

[0056] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Those skilled in the art to which the present invention pertains may make various modifications or supplements to the described specific embodiments or use similar means for substitution, but will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A production process for composite polyurethane materials, characterized in that: It includes the following steps: Pressurized impregnation: Input the raw materials into a glue bucket filled with silicone liquid for impregnation, and roll and press the raw materials through at least a pair of pressure rollers in the glue bucket to obtain impregnated materials; Discharging: Output the impregnated materials from the discharge port of the glue bucket, and lift the impregnated materials through a transmission component to form an angle of 20 - 70° between the impregnated materials and the side wall of the glue bucket; Leakage test: Inject a test liquid at the angle formed between the impregnated materials and the side wall of the glue bucket for a leakage test; Test judgment: If the leakage test is qualified, the transmission component transports the impregnated materials in the original direction; If the leakage test is unqualified, the transmission component transports in the direction opposite to the original direction, and inputs the impregnated materials from the discharge port of the glue bucket into the glue bucket for re - impregnation treatment; Baking: Bake the qualified impregnated materials to obtain finished products; The test liquid is silicone liquid; The leakage test includes: detecting the dripping speed of the test liquid at the impregnated materials; and the leakage test is qualified when the dripping speed of the test liquid at the impregnated materials is less than or equal to 1 drop / second; The equipment used in the production process includes: a glue bucket (1), a feed port (11) provided at the upper end of the glue bucket (1) and a discharge port (12) provided on the side wall at the lower end of the glue bucket (1), a receiving box (2) provided at the side end of the glue bucket (1) where the discharge port (12) is located, a first feeding roller (3) provided at the feed port (11), a second feeding roller (4) provided at the discharge port (12), at least one set of pressing rollers (5) provided in the glue bucket (1), at least one transmission roller (6) provided at the end of the receiving box (2) far from the glue bucket (1) and with a height in the vertical direction greater than the height of the discharge port (12), and a drying device (7) provided on the side end of the receiving box (2) where the transmission roller (6) is installed; The receiving box (2) includes a box body (21) connected to the side wall of the glue bucket (1) and with an open upper end, a liquid return pipe (22) provided at the lower end of the box body (21), and a recovery structure (23) provided outside the box body (21) and connected to the liquid return pipe (22); The second feeding roller (4) includes an upper roller body (41) and a lower roller body (42) that are rotatably arranged on the discharge port (12) and distributed vertically, and a liquid outlet (43) provided on the roller surface of the upper roller body (41) for the outflow of silicone liquid; 2. The production process for a composite polyurethane material according to claim 1, characterized in that: The receiving box (2) further includes a partition vertical plate (24) provided on the inner bottom surface of the box body (21), an adjusting vertical plate (25) slidably connected to the upper end of the partition vertical plate (24), a top wheel (26) provided at the upper end of the adjusting vertical plate (25) for supporting the impregnated materials, and a driving structure (27) provided on the box body (21) for driving the adjusting vertical plate (25) to rise / fall; 3. The production process for a composite polyurethane material according to claim 2, characterized in that: The height of the top wheel (26) in the vertical direction is less than the height of the transmission roller (6).

4. A production process for a composite polyurethane material according to claim 1, characterized in that: A partition plate (13) for forming a dust removal chamber is arranged inside the glue bucket (1) and is located at the lower end of the feed inlet (11). A dust removal port (131) matching the feed inlet (11) is arranged on the partition plate (13); a dust removal fan (14) communicating with the dust removal chamber is arranged on the side wall of the glue bucket (1).

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