A mineral wool sandwich panel PIR edge sealing production system and production process

Abstract

The present application relates to a kind of mineral wool sandwich panel PIR edge production system and production process, including white material storage tank, pentane storage tank, online cutting precision mixer, transition tank, black material storage tank and mixing head.Due to the small amount of edge material, the mixing effect of polyester and pentane is affected, and high fire-resistant edge sandwich panel cannot be made, the system increases the flow of white material and pentane in the mixer by cutting, extruding, impacting and dispersing, and improves the mixing effect.The consumption of premixed white material in the mixing head is relatively small, and the discharge of the mixing head cannot be interrupted, the output of premixed white material and the consumption of premixed white material in the mixing head are not the same, in order to balance the flow, increase the flow of premixed white material + intermittent feeding = small flow of mixing head + continuous discharge to balance the flow, the intermediate transfer transition device buffers premixed white material to solve the uninterrupted discharge of the mixing head to achieve continuous production, and successfully overcome the major problem of online mixing and foaming due to small flow of polyester and pentane.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sandwich panels, and particularly relates to a mineral wool sandwich panel PIR edge sealing production system and production process. BACKGROUND

[0002] At present, the industry is very troubled by the polyurethane edge sealing foaming foam product of the rock wool sandwich panel. Originally, 141B was used as a foaming agent. The miscibility of 141B foaming agent and polyester is relatively good. With the approaching of the last ban time of 141B in the Montreal Protocol of the United Nations (January 1, 2026), replacing 141B foaming agent is an urgent and top priority. The current replacement method is: 1) water foaming (easily shrinks, powders, low strength, requires high foam density to compensate, cannot meet the quality requirements of sandwich panels); 2) 245 foaming: 245 is not a very environmentally friendly material, and has a high greenhouse effect. It is also a material that the United Nations is preparing to eliminate. It can be used temporarily at present, but the price is as high as RMB 40,000 / ton, which is too high to bear. Almost no one uses this material; 3) LBA foaming agent, the current price is 60,000 / ton, the cost is too high, and no one in the industry will use this material

[0003] The current more economical replacement method is polyether + cyclopentane, which can barely produce, but cannot produce high flame-retardant PIR foam. Only B3 sandwich panels of fire-resistant grade can be produced. In addition, due to the high boiling point of cyclopentane, 49℃ volatilization, the relative exposure of the core of the sandwich panel to the atmosphere reduces the pressure of the closed cell (the outdoor air temperature will be lower than 49℃ all year round) resulting in the sandwich panel being pressed flat (the thickness direction of the sandwich panel will shrink seriously) plus the low strength of the polyether material, the two superimposed, the shrinkage of the sandwich panel will be very serious

[0004] The polyurethane edge sealing of the rock wool sandwich panel is on both sides, and the middle rock wool will not shrink, which leads to uneven panel surface and collapse on both sides, seriously affecting the quality of the wall. This problem cannot be solved in the industry at present.

[0005] In the building insulation sandwich panel industry, rock wool and glass wool sandwich panels are widely used as a kind of insulation and fireproof building material. However, as a kind of inorganic material, mineral wool is easy to absorb water, which greatly reduces the strength of the panel after absorbing water, greatly reduces the insulation effect, shortens the service life of the core material, and accelerates the corrosion of the paint layer on the inner layer of the steel plate, shortening the overall service life of the sandwich panel. The industry usually uses polyurethane edge sealing on the side of the sandwich panel to improve the strength and waterproof performance of the panel. Although the edge sealing solves the waterproof problem, it brings the serious disadvantage of not being fireproof, which leads to two safety hazards of the rock wool polyurethane edge sealing sandwich panel. The first is that when the polyurethane edge sealing node is burned and collapsed, the wall collapses immediately, for example Figure 1The photo shows that on November 5, 2024, a fire occurred in Changzhou Jintan Chaofeng Company, and the polyurethane edge sealing part of the rock wool polyurethane edge sealing sandwich board is a 141B and polyether combined foaming body, with a fire rating of B3. After encountering fire attack, the edge sealing was quickly burned off and could not play the role of connecting and supporting the sandwich board, resulting in the collapse of the wall; the second is that it is ignited by sparks caused by electric welding and abrasive cutting during construction, for example Figure 2 The photo is a photo of a fire caused by a construction process in a temporary construction project at a subway entrance in Jinan City. This is a polyether and cyclopentane combined edge sealing foam, and the fire rating is also B3. This is a serious safety and quality risk of the product at present, because the foam edge sealing does not have flame retardant capability and can be ignited by various open flames to cause a fire.

[0006] In the production of PIR polyurethane edge sealing rock wool sandwich boards, since polyester and pentane are two completely insoluble materials, the current mixed process path on the market is to use a reaction kettle tank to mix. The working principle is to weigh the white material polyester and pentane according to the proportion, and convey them to the reaction kettle. The materials are mixed by rotating the propeller in the middle of the reaction kettle tank. This mixing process does not quickly cut, disperse, and impact the two materials, which belongs to macroscopic mixing. After this mixing stops, stratification will occur immediately, and pentane hazardous chemicals will overflow from the mixed material. Since the density of pentane is lower than that of polyester white material, it will float on the surface of polyester, causing serious safety hazards. PIR edge sealing sandwich boards cannot be produced, and only polyether and cyclopentane can be mixed at present. The reaction kettle can barely meet the mixing requirements, but polyether cannot produce high flame-retardant PIR foam. Only ordinary non-fireproof edge sealing foam can be made.

[0007] It should be noted that the information disclosed in the above background section about the foam is only used to strengthen the understanding of the background of the present disclosure, and therefore can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0008] In view of the fact that the process technology has not been conquered in the industry, the embodiments of the present application disclose a mineral wool sandwich board PIR edge sealing production system and production process to solve the key problem that polyester and pentane cannot be mixed online in PIR polyurethane edge sealing.

[0009] The technical solutions adopted by the present application are as follows:

[0010] The mineral wool sandwich panel PIR edge sealing production system, the production system includes white material storage tank, pentane storage tank, online cutting precision mixer, transfer transition device, black material storage tank and mixing head, the first pipe is connected to the first feeding end of the online cutting precision mixer, the first pipe is provided with white material metering pump, the white material metering pump transports white material to the online cutting precision mixer, the second pipe is connected to the second feeding end of the online cutting precision mixer, the second pipe is provided with pentane metering pump, the pentane metering pump transports pentane to the online cutting precision mixer, the online cutting precision mixer mixes white material and pentane to obtain premixed white material, the discharge end of the online cutting precision mixer is connected to the transfer transition device, the online cutting precision mixer outputs premixed white material to the transfer transition device, the third pipe is connected to the mixing head, the third pipe is provided with premixed white material metering pump, the premixed white material metering pump continuously transports premixed white material to the mixing head, the feeding speed of the transfer transition device is greater than the discharge speed of the premixed white material metering pump, the fourth pipe is connected to the mixing head, the fourth pipe is provided with black material metering pump, the black material metering pump continuously transports black material to the mixing head, and the premixed white material and the black material are mixed by collision in the mixing head.

[0011] Further technical solutions are that the online cutting precision mixer is a dynamic mixer, the dynamic mixer performs dynamic high-shear mixing and emulsification, the dynamic mixer includes a motor, a shell, a fixed blade arranged in the shell, a rotating blade matched with the fixed blade, a shaft connected with the rotating blade and the output end of the motor, and a mechanical seal sleeved outside the shaft, the mechanical seal is in sealing connection with the end surface of the shell, when the white material and the pentane flow into the flow channel between the fixed blade and the rotating blade by the pressure of the pump, the output of the motor makes the rotating blade rotate at a high speed of 3-20 m / s, the gap of 0.1-0.5 mm between the rotating blade and the fixed blade shears each other, the two different phase liquids of the white material and the pentane are instantaneously blasted, cut, dispersed and impacted to form stable continuous phase liquid after being recombined to nano-level fine particles.

[0012] Further technical solutions are that the online cutting precision mixer is a static mixer, the static mixer is tubular, a cutting blade with a certain angle spiral is fixedly arranged in the pipe, the liquid is gradually cut and mixed by the cutting blade when flowing, the cutting blade is in a fluid spiral shape to reduce resistance when the liquid passes through and make the liquid rotate during movement along the length direction of the pipe body, improve the mixing effect, the cutting blade is arranged from the inlet to the outlet in a manner that the number gradually increases from few to many, the aperture gradually decreases from large to small, and the thickness gradually decreases from thick to thin, the cutting blade cuts the white material and pentane into 2 strands and 4 strands from the beginning of feeding to the outlet to achieve the process requirement of the premixing of PIR foam.

[0013] Further technical solutions are that the transfer transition device is a storage tank, the volume of the storage tank is 5L-20L, the feeding end of the storage tank is connected with the online cutting precision mixer through a pipeline, the discharging end of the storage tank is connected with the premixed white material metering pump through a third pipeline, a liquid level sensor is arranged in the storage tank, the lower limit of the liquid level sensor is a feeding start, and the upper limit of the liquid level sensor is a feeding stop.

[0014] Further technical solutions are that the transfer transition device includes a movable container, a conveying device and a storage tank, the dynamic mixer outputs the premixed white material into the movable container, the conveying device conveys the movable container to a sandwich panel production line at a different place and feeds the movable container into the storage tank, the storage tank is connected with the third pipeline, the capacity of the movable container is generally 200kg-1t, and the premixed white material metering pump continuously conveys the premixed white material in the storage tank to the mixing head through the third pipeline.

[0015] Further technical solutions are that the ratio of the white material to pentane input into the online cutting precision mixer is 100:1, the pentane is n-pentane or cyclopentane or cycloisopentane or n-isopentane, the mixing head is a low-pressure spiral cutting blade mixing pipe, the input compressed air pressure in the mixing pipe is 0.5Bar-7Bar, the white material and the premixed white material in the mixing pipe are mixed and cut by the spiral blade driven by the rapid flow of the gas to meet the process mixing requirement, and the mixing head can also adopt high-pressure mixing, the white material and the premixed white material are input into the mixing head through respective high-pressure metering pumps to establish pressure, and the two materials are opened at the same time through respective high-pressure on-off valves to achieve high-pressure mixing, the high-pressure collision pressure in the mixing pipe is 100-150Bar, and the high-pressure mixing can achieve sufficient mixing and emulsification.

[0016] The PIR edge banding process for mineral wool sandwich panels includes the following steps:

[0017] To obtain the emulsified mixed liquid, a process of increasing the premixed white material + intermittent feeding = small flow rate of the mixing head + continuous discharge is adopted to achieve flow balance. The intermediate transfer and transition device buffers the premixed white material to solve the problem of uninterrupted discharge from the mixing head and achieve continuous production. This successfully overcomes the major problem that the polyester and pentane cannot be mixed and foamed online due to the small flow rate.

[0018] Feeding: The white material metering pump intermittently delivers the white material from the white material storage tank to the online cutting precision mixer, while the pentane metering pump intermittently delivers the pentane from the pentane storage tank to the online cutting precision mixer;

[0019] High-flow-rate premixing: The white material and pentane are cut and mixed by an online precision mixer to obtain premixed white material;

[0020] Premixed white material buffer: The transfer and transition device receives the premixed white material intermittently input from the online cutting precision mixer;

[0021] Small-flow continuous mixing in the mixing head: The premixed white material metering pump continuously delivers the premixed white material from the transfer and transition device to the white material chamber of the mixing head. The feed rate of the transfer and transition device is greater than the discharge rate of the premixed white material metering pump. The black material metering pump continuously delivers the black material from the black material storage tank to the black material chamber of the mixing head. The premixed white material and the black material enter the mixing chamber after passing through their respective feed chambers, collide, and then enter the mixing pipe for mixing to obtain PIR polyurethane edge-sealing foam.

[0022] A further technical solution is that the step of the transfer device receiving the premixed white material intermittently input from the online cutting precision mixer includes:

[0023] Simultaneously turn on the white material metering pump, pentane metering pump, and online cutting precision mixer to replenish the storage tank until the liquid level sensor detects that the liquid level of the premixed white material in the storage tank has risen to the upper limit position, and then turn them off at the same time to keep the supplied material ratio completely consistent.

[0024] The mixing head operates continuously, supplying material continuously. As the material in the storage tank is gradually consumed, the level sensor detects that the level of the premixed white material in the storage tank has dropped to the lower limit position and sends a replenishment signal. The white material metering pump, pentane metering pump, and online cutting precision mixer are simultaneously turned on again to replenish the storage tank, completing one cycle.

[0025] A further technical solution is that the step of the premixed white material metering pump conveying the premixed white material in the transfer transition device to the white material chamber of the mixing head includes:

[0026] The premixed white material metering pump delivers the premixed white material from the storage tank to the white material chamber of the mixing head through a third pipeline.

[0027] A further technical solution is that the step of the premixed white material metering pump conveying the premixed white material in the transfer transition device to the white material chamber of the mixing head includes:

[0028] The output of the dynamic mixer is premixed white material and loaded into a movable container;

[0029] The conveying device transfers the movable container to a sandwich panel production line in another location and loads it into a storage tank. The storage tank is connected to a third pipeline, and the premixed white material metering pump continuously transports the premixed white material in the storage tank to the mixing head through the third pipeline.

[0030] The beneficial effects of the embodiments of the present invention are as follows:

[0031] (I) The mineral wool sandwich panel PIR edge banding production system of the present invention includes a white material storage tank, a pentane storage tank, an online cutting precision mixer, a transfer and transition device, a black material storage tank, and a mixing head. Because the amount of edge banding material used is very small, it affects the mixing effect of polyester and pentane, making it impossible to produce high-refractory edge banding sandwich panels. The present invention uses a large flow rate to fully compress and impact-mix the white material and pentane, achieving the mixing process for PIR foaming. Because the amount of premixed white material used in the mixing head is relatively small, and the output of the mixing head cannot be interrupted during continuous foaming production, the output of premixed white material in the front section is different from the amount of premixed white material consumed by the final mixing head in the back section. To achieve a balance between the two, the premixed white material in the front section is supplied with a large flow rate and intermittently, while the material in the back section is continuously discharged with a small flow rate. The intermediate transfer and transition device plays a connecting role between the front and the back. After the PIR rock wool sandwich panel is sealed, the fire resistance of the sandwich panel is improved by two levels, directly from B1 to B3. This eliminates the serious safety accident of the sandwich panel being ignited during construction and causing a fire. In the event of a fire, the fire resistance time of the wall is longer, which buys more time for rescue, escape, and property recovery, and can significantly reduce the damage caused by the fire.

[0032] (ii) Furthermore, since pentane is a hazardous chemical, when pentane vapor leaks and mixes with air at a ratio of 1.5% to 78%, it will explode when it comes into contact with an open flame or a temperature above 800°C. Therefore, it is very important to limit the volatilization of pentane gas during production, which greatly improves the safety factor in the production process.

[0033] 2.1 Elimination of hazardous gases at the foaming site: The mixing process path one of the present invention: The online cutting precision mixer adopts a dynamic mixer. The rotating blade and the fixed blade shear each other at a rotation speed of 10-20m / s and a gap of 0.1-0.5mm. The two different phase liquids of white material and pentane are burst, cut, dispersed and impacted to reach nanoscale particles and then recombine to form a stable continuous phase emulsion. This allows the polyester nanoparticles to encapsulate pentane, and the fine pentane nanoparticles dissolve in the polyester. In this way, when the material discharged from the mixing head is exposed to the air and injected into the continuous moving cavity of the sheet, the pentane is not easy to overflow and there is almost no leakage.

[0034] The second mixing process path of this invention: The online cutting precision mixer adopts a static mixing tube process. The inner diameter of the mixing tube is selected as 10mm. After increasing the flow rate, the flow velocity of the mixture of white material and pentane through the static mixer increases accordingly. The impact velocity of the cutting blade set between the material and the mixing tube also increases accordingly. Generally, the fluid velocity and the impact force of the blade should reach more than 3m / s. This can obtain premixed white material that will not precipitate in a short period of time, ensuring that the production process is safe and that the polyester and pentane are fully mixed and mutually encapsulated, meeting the production process of PIR.

[0035] 2.2 Savings in Raw Material and Equipment Investment Costs: This not only ensures safety but also reduces pentane volatilization emissions, saving raw materials. In conventional reactor mixing processes, a significant amount of organic waste gas volatilizes after the mixture exits the mixing head. Environmental requirements necessitate treatment methods such as carbon adsorption, catalytic combustion, or RTO incineration, all requiring substantial investment. This invention significantly limits the volatilization of organic waste gas, greatly reducing the cost of organic waste gas treatment and equipment investment. Furthermore, the absence of raw material volatilization saves on raw materials.

[0036] 2.3 Due to the use of polyester raw materials, which have high functionality, the resulting PIR foam has high compressive strength and does not shrink. Since the core of the sandwich panel is mineral wool, it does not shrink. However, the edge sealing currently used in the market is PUR foam, which shrinks. This results in the rock wool section of the core material protruding in the cross-section of the sandwich panel, while the PUR edge sealing section collapses. Currently, this phenomenon cannot be resolved. This invention uses PIR foam, which has high strength and is not easily shrunk, resulting in a sandwich panel where the rock wool section and the PIR polyurethane edge sealing section are flat.

[0037] 2.4 Investment in foaming equipment: Generally, sandwich panel production lines are capable of producing PIR high-flow-rate polyurethane core materials. However, when producing polyurethane edge sealing for rock wool core materials, a separate set of foaming equipment (equipment for polyether systems) is required. With the adoption of this invention, this set of foaming equipment dedicated to edge sealing can be greatly reduced, requiring only the output pump set at the back end. The equipment at the front end can be shared with the original foaming machine, significantly saving on equipment investment.

[0038] 2.5 Raw Material Procurement: A typical production line can produce both PIR polyurethane sandwich panels and rock wool polyurethane edge-sealed sandwich panels. However, these two materials are different systems; the former is a PIR system, and the latter is a PUR system. Using this invention, sandwich panel manufacturers no longer need to purchase two different chemical materials; they only need to purchase polyester white material, which greatly simplifies management, procurement, and warehousing, saving internal costs.

[0039] 2.6 When the premixing head output of the front section and the mixing head output of the back section are produced separately in different locations, a transfer and transition device is used to connect the front and back sections. The premixing front section can be set up at the chemical raw material supplier, and the transfer and transition device can be distributed to multiple sandwich panel manufacturers in a centralized material supply method, which greatly reduces the equipment investment of sandwich panels.

[0040] (III) Furthermore, the transfer device is a storage tank. The premixed white material metering pump transports the premixed white material in the storage tank to the mixing head through a third pipeline, which can meet the online production needs of PIR polyurethane. The transfer device includes a movable container, a conveying device, and a storage tank. The discharge end of the dynamic mixer is loaded into the movable container. The conveying device transfers the movable container to a sandwich panel production line at another location and loads it into the storage tank. The storage tank is connected to the third pipeline. The premixed white material metering pump continuously transports the premixed white material in the storage tank to the mixing head through the third pipeline, which can meet the off-site production needs of PIR polyurethane. Attached Figure Description

[0041] Figure 1 This is a schematic diagram showing the rapid collapse of a sandwich panel wall panel from a certain manufacturer after a fire.

[0042] Figure 2 This is a schematic diagram showing a sandwich panel wall panel from a certain manufacturer ignited by sparks from electric welding during construction.

[0043] Figure 3 This is a schematic diagram of the PIR edge banding production system for mineral wool sandwich panels according to the first embodiment of the present invention.

[0044] Figure 4 This is a schematic diagram of the PIR edge banding production system for mineral wool sandwich panels according to the third embodiment of the present invention.

[0045] Figure 5 This is a cross-sectional view of a 50mm thick sandwich panel.

[0046] Figure 6 This is a cross-sectional view of a 200mm thick sandwich panel.

[0047] Figure 7 This is a test diagram showing the fire resistance performance of the PIR sealing edge of the mineral wool sandwich panel of the present invention. Figure 7(a) is a schematic diagram of a combustion test of commercially available PUR polyurethane sealant and PIR polyurethane sealant prepared according to the fourth embodiment of the present invention. Figure 7 (b) is a schematic diagram showing the combustion stop of commercially available PUR polyurethane edge banding and the PIR polyurethane edge banding prepared according to the fourth embodiment of the present invention. Figure 7 (c) The left side is a schematic diagram of the internal structure of commercially available PUR polyurethane edge sealing after combustion. Figure 7 (c) The right side is a schematic diagram of the internal structure of the PIR polyurethane edge-sealed material after combustion obtained in the fourth embodiment of the present invention.

[0048] In the picture:

[0049] 1. White material storage tank; 11. First pipeline; 12. White material metering pump; 2. Pentane storage tank; 21. Second pipeline; 22. Pentane metering pump; 3. In-line cutting precision mixer; 4. Transfer device; 41. Third pipeline; 42. Premixed white material metering pump; 43. Liquid level sensor; 5. Black material storage tank; 51. Fourth pipeline; 52. Black material metering pump; 6. Mixing head; 61. Mixing pipe; 62. White material chamber; 63. Black material chamber; 7. Filter; 8. Heat exchanger. Detailed Implementation

[0050] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0051] To make the objectives, technical solutions, and advantages of this invention clearer, the device proposed by this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description. It should be noted that the drawings are in a very simplified form and use non-precise proportions, only for the purpose of conveniently and clearly illustrating the embodiments of this invention. Please refer to the accompanying drawings to make the objectives, features, and advantages of this invention more apparent and understandable. It should be understood that the structures, proportions, sizes, etc., depicted in the accompanying drawings are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this invention. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportional relationships, or adjustments to the size, without affecting the effects and objectives achieved by this invention, should still fall within the scope of the technical content disclosed in this invention.

[0052] First embodiment:

[0053] This embodiment discloses a PIR edge banding production system for mineral wool sandwich panels.

[0054] like Figure 3 As shown, the mineral wool sandwich panel PIR edge banding production system includes a white material storage tank 1, a pentane storage tank 2, an online cutting precision mixer 3, a transfer and transition device 4, a black material storage tank 5, and a mixing head 6.

[0055] The white material storage tank 1 is connected to the first feed end of the online cutting precision mixer 3 through the first pipe 11. The white material metering pump 12 is installed on the first pipe 11, and the white material metering pump 12 intermittently supplies white material to the online cutting precision mixer 3.

[0056] The pentane storage tank 2 is connected to the second feed end of the online cutting precision mixer 3 via the second pipeline 21. The second pipeline 21 is equipped with a pentane metering pump 22, which intermittently supplies pentane to the online cutting precision mixer 3.

[0057] The in-line precision mixer 3 cuts and mixes the white material with pentane to obtain a premixed white material. The discharge end of the in-line precision mixer 3 is connected to a transfer device 4. For example, the ratio of white material to pentane input into the in-line precision mixer 3 is 100:6 to 12, and the pentane is n-pentane, cyclopentane, cycloisopentane, or n-isopentane. The in-line precision mixer 3 is a dynamic mixer, such as an emulsion pump. The dynamic mixer includes a motor, a housing, a fixed blade housed within the housing, a rotating blade that cooperates with the fixed blade, a shaft connecting the rotating blade and the motor output, and a mechanical seal fitted on the outside of the shaft. The mechanical seal is sealed to the end face of the housing. When the white material and pentane flow into the flow channel between the fixed blade and the rotating blade under the pressure of the metering pump, the motor output causes the rotating blade to rotate at a high speed of 3 to 20 m / s. The 0.1 to 0.5 mm gap between the rotating blade and the fixed blade shears against each other. The two different liquid phases, white material and pentane, which repel each other, are instantly burst, cut, dispersed, and impacted to reach nanoscale fine particles before recombinating to form a stable continuous liquid phase.

[0058] The online precision mixer 3 outputs premixed white material to the transfer device 4. The transfer device 4 is connected to the mixing head 6 via a third pipe 41. A premixed white material metering pump 42 is installed on the third pipe 41, continuously supplying premixed white material to the mixing head 6. The feed rate of the transfer device 4 is greater than the discharge rate of the premixed white material metering pump 42. For example, the transfer device 4 is a storage tank with a volume of 5L to 20L, which increases to 200kg to 1t during off-site transfers. The feed end of the storage tank is connected to the online precision mixer 3 via a pipeline, and the discharge end is connected to the premixed white material metering pump 42 via the third pipe 41. A level sensor 43 is installed inside the storage tank to detect the upper and lower limits of the liquid level and control the feeding stop and feeding start of the white material metering pump 12, the pentane metering pump 22, and the online precision mixer 3, respectively. Of course, in other embodiments of the present invention, the balance between the feeding and discharging of premixed white material can also be achieved by setting the on-time and off-time, and the present invention does not impose further limitations on this.

[0059] The black material storage tank 5 is connected to the mixing head 6 via a fourth pipe 51. A black material metering pump 52 is installed on the fourth pipe 51, which continuously supplies black material to the mixing head 6. The premixed white material and the black material collide and mix in the mixing head 6. For example, the black material metering pump 52 continuously pumps the black material, and the feeding speed of the black material metering pump 52 is [missing information]. The mixing head 6 is a low-pressure spiral cutting blade mixing tube 61, and the pressure inside the mixing tube 61 is 0.5 Bar to 7 Bar. The black material and the premixed white material in the mixing tube 61 rely on gas flow to increase the impact force of the two materials and the spiral cutting blades in the mixing tube 61 to achieve cutting and mixing. In other embodiments of the present invention, the mixing head 6 can also adopt high-pressure mixing. After the black material and the premixed white material are pressurized by their respective high-pressure metering pumps, they are input into the mixing chamber of the mixing head 6 and collide with each other under high pressure to achieve high-pressure mixing. The high-pressure collision pressure inside the mixing tube 61 is 100 to 150 Bar, and high-pressure mixing can achieve sufficient mixing and emulsification.

[0060] In this embodiment, the mixing head 6 has four sets: a male-side mixing head 6, a female-side mixing head 6, and two corrugated crest mixing heads 6. The number of mixing heads 6 can be adjusted according to actual production needs.

[0061] Furthermore, filters 7 and heat exchangers 8 are respectively installed on the first pipe 11, the second pipe 21 and the fourth pipe 51. The filters 7 filter impurities in the white material, pentane and black material, and the heat exchangers 8 control the feed temperature of the white material, pentane and black material.

[0062] In this embodiment, the small amount of edge banding material affects the mixing effect of polyester and pentane, making it impossible to produce high-refractory edge-banded sandwich panels. This system uses a large flow rate to fully compress and impact-mix the white material and pentane to achieve the mixing process of PIR foaming. Since the amount of premixed white material used in mixing head 6 is relatively small, and the output of mixing head 6 cannot be interrupted during continuous foaming production, the output of premixed white material in the front section is different from the amount of premixed white material consumed by the final mixing head 6 in the back section. To achieve a balance between the two, the premixed white material in the front section is supplied with a large flow rate and intermittently, while the back section is supplied with a small flow rate and continuously. The intermediate transfer and transition device 4 plays a connecting role between the front and back sections.

[0063] Second embodiment:

[0064] Based on the first embodiment, the second embodiment further optimizes and refines the online cutting precision mixer 3 of the first embodiment.

[0065] The online precision mixer 3 is a static mixing tube. The static mixer is tubular, and a cutting blade with a certain angle spiral is fixedly installed inside the tube. When the liquid flows, it is gradually cut and mixed by the cutting blade. The cutting blade is in a fluid spiral shape to reduce the resistance when the liquid passes through and to make the liquid rotate during the movement along the length of the tube, thereby improving the mixing effect. The cutting blade is arranged so that the number of blades increases from the inlet to the outlet, the pores decrease from large to small, and the thickness decreases from thick to thin. The cutting blade cuts the white material and pentane into 2 and 4 strands at the beginning of the feeding, and then into thousands of strands of mixed liquid at the outlet to meet the premixing process requirements of PIR foam.

[0066] Third embodiment:

[0067] Based on the first embodiment, the third embodiment further optimizes and refines the transfer device of the first embodiment.

[0068] like Figure 4 As shown, the transfer device 4 includes a movable container, a conveying device, and a storage tank. The premixed white material output from the dynamic mixer is input into the movable container. The conveying device transports the movable container to a sandwich panel production line in another location and loads it into the storage tank. The storage tank is connected to a third pipeline 41. The premixed white material metering pump 42 continuously transports the premixed white material in the storage tank to the mixing head 6 through the third pipeline 41.

[0069] For example, in this embodiment, a dynamic mixer is used to produce premixed white material. The conveying device can be a conveyor belt, AGV, truck, or tanker, etc. The movable container is filled with material through the live joint at the discharge end of the precision mixer 3 and conveyed through the live joint at the end of the third pipe 41.

[0070] Fourth embodiment:

[0071] This embodiment also discloses the production process of high flame-retardant PIR polyurethane edge sealing for rock wool and glass fiber sandwich panels, including the following steps:

[0072] Step S1, feeding: The white material metering pump 12 intermittently delivers the white material in the white material storage tank 1 to the online cutting precision mixer 3, while the pentane metering pump 22 intermittently delivers the pentane in the pentane storage tank 2 to the online cutting precision mixer 3.

[0073] Step S2, high-flow-rate premixing: the online cutting precision mixer 3 cuts and mixes the white material and pentane to obtain the premixed white material.

[0074] Step S3, Premixed White Material Buffer: The transfer device 4 receives the premixed white material intermittently input from the online cutting precision mixer 3.

[0075] Specifically, the step of receiving the premixed white material intermittently input from the online cutting precision mixer 3 by the transfer device 4 includes:

[0076] In step S31, the white material metering pump 12, the pentane metering pump 22, and the online cutting precision mixer 3 are turned on simultaneously to replenish the storage tank until the liquid level sensor 43 detects that the liquid level of the premixed white material in the storage tank has risen to the upper limit position, and then the pump is turned off, so as to keep the supplied material ratio completely consistent.

[0077] In step S32, the mixing head 6 operates continuously, supplying material continuously. As the material in the storage tank is gradually consumed, the liquid level sensor 43 detects that the liquid level of the premixed white material in the storage tank has dropped to the lower limit position. Then, the white material metering pump 12, the pentane metering pump 22, and the online cutting precision mixer 3 are simultaneously turned on to replenish the storage tank, completing one cycle.

[0078] Step S4, continuous mixing at low flow rate in mixing head 6: Premixed white material metering pump 42 continuously transports premixed white material from transfer device 4 to white material chamber 62 of mixing head 6. The feed rate of transfer device 4 is greater than the discharge rate of premixed white material metering pump 42. Black material metering pump 52 continuously transports black material from black material storage tank 5 to black material chamber 63 of mixing head 6. After the premixed white material and black material pass through their respective feed chambers, they merge into the mixing chamber and collide before entering the mixing pipe 61 for mixing, thus obtaining PIR polyurethane edge-sealing foam.

[0079] Specifically, the step of the premixed white material metering pump 42 conveying the premixed white material in the transfer device 4 to the white material chamber 62 of the mixing head 6 includes:

[0080] The premixed white material metering pump 42 transports the premixed white material in the storage tank to the white material chamber 62 of the mixing head 6 through the third pipeline 41.

[0081] In this embodiment, in order to obtain an emulsified mixed liquid, a process of increasing the premixed white material + intermittent feeding = small flow rate of mixing head 6 + continuous discharge is adopted to achieve flow balance. The intermediate transfer device 4 buffers the premixed white material to solve the problem of uninterrupted discharge of the mixing head and realize continuous production. This successfully overcomes the major problem that the polyester and pentane cannot be mixed and foamed online due to the small flow rate.

[0082] Fifth embodiment:

[0083] Based on the fourth embodiment, the fifth embodiment further optimizes and refines the transfer steps of the third embodiment.

[0084] The steps by which the premixed white material metering pump 42 conveys the premixed white material in the transfer device 4 to the white material chamber 62 of the mixing head 6 include:

[0085] Step S41: The premixed white material output from the dynamic mixer is loaded into a movable container.

[0086] In step S42, the conveying device transfers the movable container to the sandwich panel production line in another location and loads it into the storage tank. The storage tank is connected to the third pipeline 41, and the premixed white material metering pump 42 continuously conveys the premixed white material in the storage tank to the mixing head 6 through the third pipeline 41.

[0087] Sixth Embodiment

[0088] like Figure 5 As shown, the production of 50mm thick sandwich panels is taken as an example.

[0089] The sandwich panel has male and female sides of the same size on both sides. The female side sealing section is 0.0014㎡. The production line speed is 8m / min. The material conveying speed is 0.0014㎡ * 8m / min = 0.0112m3 / min. The total feeding speed is 0.0112m3 / min × core material density 50kg / m3 = 0.56kg / min = 560g / min.

[0090] The ratio of black pigment to premixed white pigment is 165:110. The feeding rate of black pigment = 560g / min * 165 ÷ (165 + 110) = 336g / min = 5.6g / s; the feeding rate of premixed white pigment = 560g / min * 110 ÷ (165 + 110) = 224g / min = 3.7g / s;

[0091] Since the amount of premixed white material used on the male and female sides of the sandwich panel is the same, the total feeding speed of the premixed white material for both male and female sides is 3.7g / s*2=7.4g / s.

[0092] A 20L storage tank is used. The feeding is started when the liquid level is 3L and stopped when the liquid level is 15L. The feeding amount each time is 12L × 1.1g / cm3 = 13200g.

[0093] 13200g ÷ 448g / min = 29.5min, meaning that feeding begins after 29.5min. Mixing head 6 consumes 7.4g / s * 45.5s = 340g per second. Each feeding amount is 13200g + 340g = 13540g. The actual feeding rate is 298g / s, and the feeding time is 13540g ÷ 298g / s = 45.5s, meaning each feeding session lasts 45.5 seconds.

[0094] Find the cutting speed of the premixed white material and the cutting blade of the static mixer:

[0095] If a mixing process with the same premix flow rate at the front end and the same consumption at the back end is adopted, the discharge velocity of the premixed white material is 7.4 g / s, which translates to a volume of 7.4 g / s ÷ 1.1 g / cm³ = 6.73 cm³ / s = 6730 mm³ / s. The diameter of the static mixing tube is 10 mm, and the cutting speed is 6730 mm³ / s ÷ (5 mm² * 3.14) = 85.7 mm / s. When pentane and polyester move at a speed of 85.7 mm / s and are cut by the blades in the static mixing tube, there is almost no impact force, making it impossible to obtain a mixed and emulsified premixed polyester white material. This fails to lay the foundation for the subsequent production of PIR foam.

[0096] If the increased flow mixing process of this invention is adopted, the discharge speed of the premixed white material is 298 g / s, which translates to a volume of 298 g / s ÷ 1.1 g / cm³ = 270 cm³ / s = 270909 mm³ / s. The diameter of the static mixing tube is 10 mm, and the cutting speed is 6730 mm³ / s ÷ (5 mm² * 3.14) = 3.45 m / s.

[0097] In summary: Through high-flow-rate mixing, the discharge rate of the premixed white material is 298 g / s, and the cutting speed of the premixed white material with the cutting blade of the static mixer is 3.45 m / s. Without using a mixing process that increases the flow rate, the cutting speed of the premixed white material with the cutting blade of the static mixer is 85.7 mm / s.

[0098] Seventh Embodiment

[0099] like Figure 6 As shown, the production of 200mm thick sandwich panels is taken as an example.

[0100] The sandwich panel has male and female edges of the same size on both sides. The female edge sealing section is 0.00645㎡. The production line speed is 4m / min. The material conveying speed is 0.00645㎡*4m / min=0.0258m3 / min. The total feeding speed is 0.0258m3 / min×core material density50kg / m3=1.29kg / min=1290g / min.

[0101] The ratio of black pigment to premixed white pigment is 165:110. The feeding rate of black pigment = 1290g / min * 165 ÷ (165 + 110) = 774g / min = 12.9g / s; the feeding rate of premixed white pigment = 1290g / min * 110 ÷ (165 + 110) = 516g / min = 8.6g / s;

[0102] Since the amount of premixed white material used on the male and female sides of the sandwich panel is the same, the total feeding speed of the premixed white material for both male and female sides is 8.6g / s*2=17.2g / s=1032g / min.

[0103] A 20L storage tank is used. The feeding is started when the liquid level is 3L and stopped when the liquid level is 15L. The feeding amount each time is 12L × 1.1g / cm3 = 13200g.

[0104] 13200g ÷ 1032g / min = 12.8min, meaning that feeding begins after 12.8min. Mixing head 6 consumes 17.2g / s * 45.5s = 783g per second. Each feeding amount is 13200g + 783g = 13983g. The actual feeding rate is 307g / s, and the feeding time is 13983g ÷ 307g / s = 45.5s, meaning each feeding session lasts 45.5 seconds.

[0105] Find the cutting speed of the premixed white material and the cutting blade of the static mixer:

[0106] If a mixing process with the same premixing flow rate at the front end and the same consumption rate at the back end is adopted, the discharge rate of the premixed white material is 17.2 g / s, which translates to a volume of 17.2 g / s ÷ 1.1 g / cm³ = 15.63 cm³ / s = 15636 mm³ / s. The diameter of the static mixing tube is 10 mm, and the cutting speed is 15636 mm³ / s ÷ (5 mm² * 3.14) = 199 mm / s.

[0107] If the increased flow mixing process of this invention is adopted, the discharge speed of the premixed white material is 307 g / s, which translates to a volume of 307 g / s ÷ 1.1 g / cm³ = 279.09 cm³ / s = 279090 mm³ / s. The diameter of the static mixing tube is 10 mm, and the cutting speed is 279090 mm³ / s ÷ (5 mm² * 3.14) = 3.55 m / s.

[0108] In summary: Through high-flow mixing, the discharge rate of the premixed white material is 307 g / s, and the cutting speed of the premixed white material and the cutting blade of the static mixer is 3.55 m / s.

[0109] Without using a mixing process that increases flow rate, the cutting speed of the premixed white material and the static mixer cutting blade is 199 mm / s.

[0110] Experimental example:

[0111] The premixed white and black isocyanates prepared in the fourth embodiment were mixed and injected into the side cavity of the sandwich panel for curing to form a PIR rigid foam edge seal. Commercially available PUR foam was purchased and injected into the side cavity of the sandwich panel for curing to form a PUR rigid foam edge seal. Fire resistance tests were conducted by burning both the PUR and PIR rigid foam edge seals of the sandwich panel for 2 minutes at equal intervals perpendicular to the panel surface with flames of the same 1200°C. The test results are as follows: Figure 7 As shown. Figure 7In (b), the PUR polyurethane edge seal on the right side continued to burn after the flame source was removed, while the PIR polyurethane edge seal on the left side stopped burning immediately after the flame source was removed. Figure 7 In (c), the interior of the PUR polyurethane seal on the left side has been completely carbonized and has lost its supporting strength. Figure 7 In (c), the PIR polyurethane seal on the right side has only a small amount of carbonization on the outer surface, while the interior remains intact and still has supporting strength, resulting in better fire resistance.

[0112] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0113] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A PIR edge banding production system for mineral wool sandwich panels, characterized in that, The production system includes a white material storage tank (1), a pentane storage tank (2), an online cutting precision mixer (3), a transfer device (4), a black material storage tank (5), and a mixing head (6); the white material storage tank (1) is connected to the first feed end of the online cutting precision mixer (3) through a first pipe (11), and a white material metering pump (12) is installed on the first pipe (11), which supplies white material to the online cutting precision mixer (3); the pentane storage tank (2) is connected to the second feed end of the online cutting precision mixer (3) through a second pipe (21), and a pentane metering pump (22) is installed on the second pipe (21), which supplies pentane to the online cutting precision mixer (3); the online cutting precision mixer (3) cuts and mixes the white material and pentane to obtain premixed white material. The discharge end of the online cutting precision mixer (3) is connected to the transfer transition device (4), and the online cutting precision mixer (3) outputs premixed white material to the transfer transition device (4); the transfer transition device (4) is connected to the mixing head (6) through a third pipe (41), and a premixed white material metering pump (42) is installed on the third pipe (41). The premixed white material metering pump (42) continuously delivers premixed white material to the mixing head (6), and the feeding speed of the transfer transition device (4) is greater than the discharge speed of the premixed white material metering pump (42); the black material storage tank (5) is connected to the mixing head (6) through a fourth pipe (51), and a black material metering pump (52) is installed on the fourth pipe (51). The black material metering pump (52) continuously delivers black material to the mixing head (6), and the premixed white material and black material collide and mix in the mixing head (6).

2. The mineral wool sandwich panel PIR edge banding production system according to claim 1, characterized in that: The online cutting precision mixer (3) is a dynamic mixer. The dynamic mixer performs dynamic high-shear mixing and emulsification. The dynamic mixer includes a motor, a housing, a fixed blade disposed in the housing, a rotating blade that cooperates with the fixed blade, a shaft connecting the rotating blade and the output end of the motor, and a mechanical seal sleeved on the outside of the shaft. The mechanical seal is sealed to the end face of the housing. When the white material and pentane flow into the flow channel between the fixed blade and the rotating blade through the pressure of the metering pump, the output of the motor causes the rotating blade to rotate at a high speed of 3~20m / s. The gap of 0.1~0.5mm between the rotating blade and the fixed blade shears each other.

3. The mineral wool sandwich panel PIR edge banding production system according to claim 1, characterized in that: The online cutting precision mixer (3) is a static mixer. The static mixer is tubular, and a cutting blade with a certain angle spiral is fixedly installed inside the tube. When the liquid flows, it is continuously cut and mixed by the cutting blade. The cutting blade is in the shape of a fluid spiral to reduce the resistance when the liquid passes through and to make the liquid rotate during the linear movement along the length of the tube. The cutting blade is arranged so that the number of blades increases from the inlet to the outlet, the pores decrease from large to small, and the thickness decreases. The cutting blade cuts the white material and pentane into 2 and 4 strands from the beginning of the feed and into thousands or tens of thousands of strands of mixed liquid at the outlet to meet the premixing process requirements of PIR foam. The diameter of the mixing tube (61) is determined according to the pump flow rate, and the flow velocity inside the tube must reach more than 3 m / s.

4. The mineral wool sandwich panel PIR edge banding production system according to any one of claims 1 to 3, characterized in that: The transfer device (4) is a storage tank with a volume of 5L to 20L. The inlet of the storage tank is connected to the online cutting precision mixer (3) through a pipeline. The outlet of the storage tank is connected to the premixed white material metering pump (42) through a third pipeline (41). A liquid level sensor (43) is installed inside the storage tank. The lower limit of the liquid level sensor (43) is the start of replenishment, and the upper limit of the liquid level sensor (43) is the stop of replenishment.

5. The mineral wool sandwich panel PIR edge banding production system according to claim 2, characterized in that: The transfer device (4) includes a movable container, a conveying device and a storage tank. The premixed white material output by the dynamic mixer is input into the movable container. The conveying device transports the movable container to a sandwich panel production line in another location and loads it into the storage tank. The storage tank is connected to a third pipeline (41). The premixed white material metering pump (42) continuously transports the premixed white material in the storage tank to the mixing head (6) through the third pipeline (41).

6. The mineral wool sandwich panel PIR edge banding production system according to claim 1, characterized in that: The ratio of white material to pentane input into the online cutting precision mixer (3) is 100:(6~12), and the pentane is n-pentane, cyclopentane, cycloisopentane, or n-isopentane; the mixing head (6) is a low-pressure spiral cutting blade mixing tube (61), and the compressed air input into the mixing tube (61) is 0.5 Bar~7 Bar; the black material and premixed white material in the mixing tube (61) are driven by the rapid flow of gas to drive the mixed white material and black material to be rapidly cut by the spiral blade to achieve the process mixing requirements.

7. The mineral wool sandwich panel PIR edge banding production system according to claim 1, characterized in that: The mixing head (6) uses high-pressure mixing. After the black material and the premixed white material are pressurized by their respective high-pressure metering pumps, they are input into the mixing chamber of the mixing head (6). The two materials collide with each other under high pressure to achieve high-pressure mixing. The high-pressure collision pressure is 100~150 Bar.

8. The mineral wool sandwich panel PIR edge banding production process using the mineral wool sandwich panel PIR edge banding production system of claim 1, characterized in that, Includes the following steps: Feeding: The white material metering pump (12) intermittently transports the white material in the white material storage tank (1) to the online cutting precision mixer (3), while the pentane metering pump (22) intermittently transports the pentane in the pentane storage tank (2) to the online cutting precision mixer (3); High-flow-rate premixing: The online cutting precision mixer (3) cuts and mixes the white material and pentane to obtain the premixed white material; Premixed white material buffer: Transfer device (4) receives premixed white material intermittently input from online cutting precision mixer (3); Mixing head (6) small flow continuous mixing: The premixed white material metering pump (42) continuously transports the premixed white material in the transfer transition device (4) to the white material chamber (62) of the mixing head (6). The feeding speed of the transfer transition device (4) is greater than the discharge speed of the premixed white material metering pump (42). The black material metering pump (52) continuously transports the black material in the black material storage tank (5) to the black material chamber (63) of the mixing head (6). The premixed white material and the black material enter the mixing chamber after passing through their respective feeding chambers and collide before entering the mixing head (6) to mix, thus obtaining PIR polyurethane edge sealing foam.

9. The PIR edge-sealing production process for mineral wool sandwich panels according to claim 8, characterized in that, The step of the transfer device (4) receiving the premixed white material intermittently input from the online cutting precision mixer (3) includes: Simultaneously turn on the white material metering pump (12), pentane metering pump (22) and online cutting precision mixer (3) to replenish the storage tank of the transfer device (4) until the liquid level sensor (43) of the storage tank detects that the liquid level of the premixed white material in the storage tank has risen to the upper limit position, and then turn them off at the same time, so as to keep the supplied material ratio completely consistent. The mixing head (6) works continuously, and the material in the storage tank is gradually consumed. After the liquid level sensor (43) detects that the liquid level of the premixed white material in the storage tank drops to the lower limit position, it sends a replenishment signal and simultaneously turns on the white material metering pump (12), pentane metering pump (22) and online cutting precision mixer (3) to replenish the storage tank, completing one cycle.

10. The PIR edge banding production process for mineral wool sandwich panels according to claim 8, characterized in that, The step of the premixed white material metering pump (42) conveying the premixed white material in the transfer device (4) to the white material chamber (62) of the mixing head (6) includes: The premixed white material metering pump (42) transports the premixed white material in the storage tank of the transfer device (4) through the third pipeline (41) to the white material chamber (62) of the mixing head (6).

11. The PIR edge-sealing production process for mineral wool sandwich panels according to claim 8, characterized in that, The step of the premixed white material metering pump (42) conveying the premixed white material in the transfer device (4) to the white material chamber (62) of the mixing head (6) includes: The premixed white material output from the dynamic mixer of the online cutting precision mixer (3) is loaded into the movable container of the transfer transition device (4); the conveying device of the transfer transition device (4) transfers the movable container to the sandwich panel production line in another location and loads it into the storage tank of the transfer transition device (4). The storage tank is connected to the third pipeline (41), and the premixed white material metering pump (42) continuously transports the premixed white material in the storage tank to the mixing head (6) through the third pipeline (41).

Images