Sound-absorbing and noise-reducing flame-retardant material and preparation method thereof

Abstract

The application discloses a sound-absorbing and noise-reducing flame-retardant material and a preparation method thereof, relates to the sound-absorbing and flame-retardant material processing technical field, and the material comprises the following components: 5-10 parts of carbon fibers, 15-30 parts of regenerated cotton fibers, 2-6 parts of polyester fibers, 15-20 parts of low-melting-point thermoplastic fibers and 20-30 parts of non-woven fibers. The preparation method comprises the following steps: opening treatment, primary needling, impregnation and drying, baking, washing and drying, secondary needling, steam blowing, mold closing forming and cutting. The application further discloses an impregnation and drying integrated machine for impregnating a flame retardant and drying treatment. The mixed felt of the application is mixed with multiple materials, impregnated with the flame retardant, has excellent sound-absorbing and flame-retardant properties, and has good thermoplastic forming properties. The mixed felt semi-finished product after secondary needling is subjected to steam blowing, so that the mixed felt semi-finished product is further puffed, the sound-absorbing property is improved, and the mixed felt semi-finished product has certain shock-absorbing effect.

Description

Technical Field

[0001] This invention belongs to the field of sound-absorbing and flame-retardant material processing technology, specifically relating to a sound-absorbing, noise-reducing, and flame-retardant material and its preparation method. Background Technology

[0002] The traditional manufacturing method for automotive noise-reducing felt in China generally involves using blends of mixed cotton, recycled cotton, and phenolic resin to create felt sheets of different sizes and the same areal density. After heating the material, it is then molded and cured to form the felt product. While these materials offer some noise reduction, they still have shortcomings. Furthermore, the resulting material has a high density, which, while providing good strength and tensile properties, sacrifices significant sound absorption and noise reduction effects.

[0003] Currently, there is a wide variety of sound insulation materials on the market. Materials with different compositions have significantly different sound insulation effects and mechanical properties (such as tensile strength). Furthermore, the thermoplastic molding properties of existing hybrid felts need improvement. In addition, traditional production processes are complex. During the impregnation of flame retardants, the hybrid felt needs to be bent downwards by guide rollers into the liquid storage tank, and then bent out of the tank by the same rollers. During this process, the guide rollers need to apply a large tension to the hybrid felt. This causes the flame retardant inside the felt to be easily squeezed out, affecting the impregnation effect. It also makes cleaning and maintenance of the guide rollers inconvenient and results in slow feeding speed. Moreover, after impregnation with flame retardants, the felt needs to be tucked in, which can easily cause severe wrinkles and tightness after drying. Summary of the Invention

[0004] The purpose of this invention is to provide a sound-absorbing, noise-reducing, and flame-retardant material and its preparation method, so as to solve the above-mentioned defects caused by the prior art.

[0005] A sound-absorbing, noise-reducing, and flame-retardant material, comprising the following parts by weight: The materials consist of 5-10 parts carbon fiber, 15-30 parts recycled cotton fiber, 2-6 parts polyester fiber, 15-20 parts low-melting-point thermoplastic fiber, and 20-30 parts non-woven fiber. The specifications of the above materials are: 6-20D in diameter and 20-100mm in length.

[0006] A method for preparing a sound-absorbing, noise-reducing, and flame-retardant material includes the following steps: (1) Opening treatment: Take a certain amount of carbon fiber, recycled cotton fiber, polyester fiber, low melting point thermoplastic fiber and non-woven fiber according to the proportion, feed and mix them through five electronic opening machines, and then the mixing unit conveyor curtain transports the mixed raw materials to the fine opening machine for opening and dispersing. Then, the carding machine is used to card them evenly, and then the above mixed fibers are laid into a mixed fiber web by the web laying machine. (2) First needle punching: The fiber web is fed into the needle punching machine for the first needle punching. The needle punching frequency is 40-50 Hz and the needle punching density is 310-330 needles / cm. 2 The needle-punching depth is 7-10mm, forming a preliminary mixed felt; (3) Impregnation and drying: The mixed felt is passed horizontally through the impregnation and drying machine. The mixed felt is first passed through the liquid flame retardant in the impregnation and drying machine and the flame retardant is impregnated on its surface. Then it is quickly dried by the drying component at the tail of the impregnation and drying machine to dry the liquid flame retardant on its surface. During this process, the feeding speed of the mixed felt is 10-15cm / s and the drying temperature is 185-200℃. (4) Baking: The above-dried mixed felt is then baked at a temperature of 150-170℃ for 45-60s. (5) Washing and drying: The above-baked mixed felt is washed with water and then dried. (6) Secondary needle punching: The mixed felt dried in step (6) is subjected to a second needle punching process to obtain a semi-finished mixed felt. The needle punching frequency is 30-40 Hz and the needle punching density is 230-250 needles / cm. 2 The needle insertion depth is 1-2 mm; (7) Steam injection: Cut the semi-finished mixed felt after needle punching in step (6) into blocks and put them into the steam mold. Close the steam mold and inject the steam from the steam generator into the sound insulation substrate through the steam mold. (8) Mold closing, molding and cutting: The mixed felt heated by steam is laid in the cold forming mold in two layers, and an adhesive is applied between the two layers. The cold forming mold is closed. After molding, the robot grabs it and places it on the cutting equipment to cut it into specific sizes to obtain the required product.

[0007] Preferably, in step (7), the pressure of the steam engine is controlled at 30-35 MPa, the heating temperature of the steam mold is controlled at 230-235℃, and the heating time is maintained at 25-35 s.

[0008] Preferably, in step (8), the pressure of the main cylinder of the molding press is 8-10 MPa and the pressure holding time is 40-45 s.

[0009] Preferably, the impregnation and drying integrated machine includes a liquid storage tank, an air inlet box, a mixing mechanism, a flow stabilizing mechanism, a lifting mechanism, and a driving mechanism. The bottom of the liquid storage tank is equipped with support legs, and an inlet and outlet are respectively located on both sides of the liquid storage tank. The air inlet box is installed on the outer side of the inlet and outlet and is used to blow away the liquid located inside the inlet and outlet. A drying component is also installed in the air inlet box located on the outlet side to achieve the drying treatment of the mixed felt. The mixing mechanism is installed in the liquid storage tank and is used to stir the liquid in the liquid storage tank to form a circulating flow. The flow stabilizing mechanism is installed in the liquid storage tank and is driven by the driving mechanism to the air inlet box located on the outlet side to realize the opening and closing of the flow stabilizing mechanism. The flow stabilizing mechanism is used to make the liquid on both sides of the liquid storage tank tend to stabilize. The lifting mechanism is installed at the bottom of the liquid storage tank and is used to lift the liquid in the liquid storage tank, and can drive the mixing mechanism to operate when it reaches its highest point.

[0010] Preferably, the air inlet box includes an end plate and a cover, with air inlet pipes installed at both the upper and lower ends of the cover, and guide holes for the mixing felt to pass through are provided on both the end plate and the cover. The length of the air inlet box located on one side of the discharge end is greater than that of the other air inlet box. A guide block is installed in the air inlet box located on the discharge end side to divide the airflow entering the air inlet box into two parts. One part enters the liquid storage tank and the other part enters the drying component. The drying component includes an electric heating grid and an air guide plate symmetrically arranged in the air inlet box. The air guide plate is provided with several inclined ventilation holes. The electric heating grid and the air guide plate are both horizontally installed in the air inlet box, and the air guide plate is located on the upper and lower sides of the mixing felt. The electric heating grid, the cover, and the guide block constitute a drying chamber.

[0011] Preferably, there are two mixing mechanisms symmetrically installed inside the storage tank, specifically including a rotating frame, a gear ring, stirring blades, and a rotating shaft. The rotating shaft is installed on the rotating frame and one end of it is rotatably connected to the side wall of the storage tank. The gear ring is installed on the outer ring of the rotating frame. Several stirring blades are installed on the outer ring of the rotating frame on one side of the gear ring. The stirring blades are arranged circumferentially along the axis of the rotating frame. The two rotating shafts are connected by a coupling to form a whole. The lifting mechanism includes a base plate, a hydraulic cylinder, and a guide column. The base plate is slidably connected to the liquid storage tank, and its lower end is connected to the output end of the hydraulic cylinder. The guide column is fixed to the bottom surface of the base plate and slidably connected to the bottom of the liquid storage tank. Two power mechanisms are symmetrically installed on the top surface of the base plate, specifically including two symmetrically arranged supports. A drive gear is rotatably connected to the support, and one of the drive gears is connected to the output end of the drive motor.

[0012] Preferably, the flow stabilizing mechanism includes two symmetrically arranged flow stabilizing plates. The flow stabilizing plates are provided with several through holes and a U-shaped notch that cooperates with the rotating shaft. Telescopic mechanisms are installed on the front and rear sides of the flow stabilizing plates. The telescopic mechanisms are fixed in the liquid storage tank by means of a horizontal plate. The telescopic mechanism includes a piston cylinder, a piston rod, and a piston. The piston cylinder is installed on the horizontal plate. The lower end of the piston rod is connected to the piston and is slidably connected in the piston cylinder by means of the piston. The lower end of the piston cylinder is provided with an air inlet. The driving mechanism includes a straight pipe, a slide rod, a drive rod, and a support plate. The straight pipe has a transverse air inlet channel and an air outlet channel, which are coaxially arranged. The air inlet channel and the air outlet channel are connected to the drying chamber and the air inlet respectively through connecting pipes. The slide rod is slidably connected inside the straight pipe, and its lower end is connected to the drive rod. The drive rod is installed at one end of the support plate, and the other end of the support plate is connected to the guide column. The lower part of the slide rod has a connecting hole that matches the air inlet channel, and the upper part of the slide rod has an L-shaped pressure relief hole, the upper end of which is connected to the atmosphere.

[0013] The advantages of this invention are: (1) The mixed felt of the present invention uses a variety of materials mixed together. By impregnating flame retardant, it not only has excellent sound absorption and flame retardant properties, but also good thermoplastic molding properties (the addition of polyester fiber). During the production process, by controlling the needle punching parameters, drying temperature and time, the product finally meets the expected requirements even though the thickness is relatively thin. (2) In this invention, the mixed felt semi-finished product after secondary needle punching is steamed to make it more fluffy, which improves the sound absorption performance and also has a certain shock absorption effect. (3) In this invention, in order to avoid wrinkles and tightness of the product caused by the sizing liquid, a horizontal impregnation and drying treatment method is adopted. That is, the mixed felt is directly impregnated with the flame retardant after being lifted by the liquid flame retardant at a reasonable feeding speed, and then dried by the drying component. There is no need to bend the mixed felt or set up guide rollers. Without reducing the feeding speed, the mixed felt can lock in more flame retardant and eliminate the sizing process, reducing the degree of wrinkles and tightness of the product in the later stage. The fluffy effect of the mixed felt can be achieved by using a lower depth of needle punching, which improves the sound insulation effect. In addition, due to the high-speed airflow at the inlet and outlet, impurities and excess flame retardant attached to the surface of the mixed felt can be removed to accelerate the drying process. Attached Figure Description

[0014] Figure 1 This is a process flow diagram of the present invention.

[0015] Figure 2 This is a schematic diagram of the structure of the integrated impregnation and drying machine of the present invention.

[0016] Figure 3This is a magnified view of a portion of the air inlet box at the discharge port.

[0017] Figure 4 This is a side view showing the positions of the hybrid mechanism and the power mechanism.

[0018] Figure 5 This is a side view of the location of the flow stabilizing mechanism.

[0019] Among them, 1-liquid storage tank, 2-air inlet box, 21-end plate, 22-cover, 23-air inlet pipe, 24-guide hole, 3-mixing mechanism, 31-rotating frame, 32-gear ring, 33-stirring blade, 34-rotating shaft, 35-coupling, 4-flow stabilizing mechanism, 41-flow stabilizing plate, 42-through hole, 43-U-shaped notch, 44-telescopic mechanism, 441-piston cylinder, 442-piston rod, 443-piston, 444-horizontal plate, 445-air inlet, 5-lifting mechanism, 51-bottom Plate, 52-Hydraulic cylinder, 53-Guide column, 6-Drive mechanism, 61-Straight pipe, 62-Slide rod, 63-Drive rod, 64-Support plate, 65-Air inlet channel, 66-Air outlet channel, 67-Connecting hole, 68-Pressure relief hole, 7-Power mechanism, 71-Support, 72-Drive gear, 73-Drive motor, 8-Feed inlet, 9-Discharge outlet, 10-Drying component, 101-Guide block, 102-Electric heating mesh, 103-Air guide plate, 104-Ventilation hole, 11-Liquid level sensor. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments. Example

[0021] like Figure 2 As shown, a sound-absorbing, noise-reducing, and flame-retardant material comprises the following parts by weight: The materials consist of 5 parts carbon fiber, 15 parts recycled cotton fiber, 2 parts polyester fiber, 15 parts low-melting-point thermoplastic fiber, and 20 parts non-woven fiber. The specifications of all the above materials are: 6D thickness and 100mm length.

[0022] A method for preparing a sound-absorbing, noise-reducing, and flame-retardant material includes the following steps: (1) Opening treatment: Take a certain amount of carbon fiber, recycled cotton fiber, polyester fiber, low melting point thermoplastic fiber and non-woven fiber according to the proportion, feed and mix them through five electronic opening machines, and then the mixing unit conveyor curtain transports the mixed raw materials to the fine opening machine for opening and dispersing. Then, the carding machine is used to card them evenly, and then the above mixed fibers are laid into a mixed fiber web by the web laying machine. (2) For the first needle punching, the fiber web is fed into the needle punching machine for the first needle punching. The needle punching frequency is 40 Hz and the needle punching density is 310 needles / cm.2 The needle-punching depth is 10mm, forming a preliminary mixed felt; (3) Impregnation and drying: The mixed felt is passed horizontally through the impregnation and drying machine. The mixed felt is first passed through the liquid flame retardant in the impregnation and drying machine and the flame retardant is impregnated on its surface. Then it is quickly dried by the drying component at the tail of the impregnation and drying machine to dry the liquid flame retardant on its surface. During this process, the feeding speed of the mixed felt is 10cm / s and the drying temperature is 185℃. (4) Baking: The above-dried mixed felt is then baked at a temperature of 150°C for 60 seconds. (5) Washing and drying: The above-baked mixed felt is washed with water and then dried. (6) Secondary needle punching: The mixed felt dried in step (6) is subjected to a second needle punching process to obtain a semi-finished mixed felt. The needle punching frequency is 30 Hz and the needle punching density is 230 needles / cm. 2 The needle insertion depth is 2mm; (7) Steam injection: Cut the mixed felt semi-finished product after needle punching in step (6) into blocks and put them into the steam mold. Close the steam mold and inject the steam in the steam engine into the sound insulation substrate through the steam mold. Control the pressure of the steam engine to 30MPa, control the heating temperature of the steam mold to 230℃, and keep the heating time at 35s. (8) Mold closing, molding and cutting: The mixed felt heated by steam is laid in the cold forming mold in two layers, and an adhesive is applied between the two layers. The cold forming mold is closed, the pressure of the main cylinder of the molding press is 8MPa, and the pressure holding time is 45s. After molding, the robot grabs it and places it on the cutting equipment to cut it into specific sizes to obtain the required product. Example

[0023] A sound-absorbing, noise-reducing, and flame-retardant material, comprising the following parts by weight: The composition consists of 7 parts carbon fiber, 20 parts recycled cotton fiber, 5 parts polyester fiber, 18 parts low-melting-point thermoplastic fiber, and 25 parts nonwoven fiber. The specifications of all the above materials are: 12D thickness and 60mm length.

[0024] A method for preparing a sound-absorbing, noise-reducing, and flame-retardant material includes the following steps: (1) Opening treatment: Take a certain amount of carbon fiber, recycled cotton fiber, polyester fiber, low melting point thermoplastic fiber and non-woven fiber according to the proportion, feed and mix them through five electronic opening machines, and then the mixing unit conveyor curtain transports the mixed raw materials to the fine opening machine for opening and dispersing. Then, the carding machine is used to card them evenly, and then the above mixed fibers are laid into a mixed fiber web by the web laying machine. (2) For the first needle punching, the fiber web is fed into the needle punching machine for the first needle punching. The needle punching frequency is 45 Hz and the needle punching density is 320 needles / cm. 2 The needle-punching depth is 8mm, forming a preliminary mixed felt; (3) Impregnation and drying: The initial mixed felt is passed horizontally through the impregnation and drying machine. The mixed felt is first passed through the liquid flame retardant in the impregnation and drying machine and the flame retardant is impregnated on its surface. Then it is quickly dried by the drying component at the tail of the impregnation and drying machine to dry the liquid flame retardant on its surface. During this process, the feeding speed of the mixed felt is 12cm / s and the drying temperature is 190℃. (4) Baking: The above-dried mixed felt is then baked at a temperature of 160°C for 50 seconds. (5) Washing and drying: The above-baked mixed felt is washed with water and then dried. (6) Secondary needle punching: The mixed felt dried in step (6) is subjected to a second needle punching process to obtain a semi-finished mixed felt. The needle punching frequency is 35 Hz and the needle punching density is 240 needles / cm. 2 The needle insertion depth is 1.5 mm; (7) Steam injection: Cut the mixed felt semi-finished product after needle punching in step (6) into blocks and put them into the steam mold. Close the steam mold and inject the steam in the steam engine into the sound insulation substrate through the steam mold. Control the pressure of the steam engine to 32MPa, control the heating temperature of the steam mold to 232℃, and keep the heating time at 30s. (8) Mold closing, molding and cutting: The mixed felt heated by steam is laid in the cold forming mold in two layers, and an adhesive is applied between the two layers. The cold forming mold is closed, the pressure of the main cylinder of the molding press is 9MPa, and the pressure holding time is 42s. After molding, the robot grabs it and places it on the cutting equipment to cut it into specific sizes to obtain the required product. Example

[0025] A sound-absorbing, noise-reducing, and flame-retardant material, comprising the following parts by weight: The materials consist of 10 parts carbon fiber, 30 parts recycled cotton fiber, 6 parts polyester fiber, 20 parts low-melting-point thermoplastic fiber, and 30 parts non-woven fiber. The specifications of all the above materials are: 20D in diameter and 20mm in length.

[0026] A method for preparing a sound-absorbing, noise-reducing, and flame-retardant material includes the following steps: (1) Opening treatment: Take a certain amount of carbon fiber, recycled cotton fiber, polyester fiber, low melting point thermoplastic fiber and non-woven fiber according to the proportion, feed and mix them through five electronic opening machines, and then the mixing unit conveyor curtain transports the mixed raw materials to the fine opening machine for opening and dispersing. Then, the carding machine is used to card them evenly, and then the above mixed fibers are laid into a mixed fiber web by the web laying machine. (2) For the first needle punching, the fiber web is fed into the needle punching machine for the first needle punching. The needle punching frequency is 50 Hz and the needle punching density is 330 needles / cm. 2 The needle-punching depth is 7mm, forming a preliminary mixed felt; (3) Impregnation and drying: The initial mixed felt is passed horizontally through the impregnation and drying machine. The mixed felt is first passed through the liquid flame retardant in the impregnation and drying machine and the flame retardant is impregnated on its surface. Then it is quickly dried by the drying component at the tail of the impregnation and drying machine to dry the liquid flame retardant on its surface. During this process, the feeding speed of the mixed felt is 15cm / s and the drying temperature is 200℃. (4) Baking: The dried mixed felt is then baked at 170°C for 45 seconds. (5) Washing and drying: The above-baked mixed felt is washed with water and then dried. (6) Secondary needle punching: The mixed felt dried in step (6) is subjected to a second needle punching process to obtain a semi-finished mixed felt. The needle punching frequency is 40 Hz and the needle punching density is 250 needles / cm. 2 The needle insertion depth is 1 mm; (7) Steam injection: Cut the mixed felt semi-finished product after needle punching in step (6) into blocks and put them into the steam mold. Close the steam mold and inject the steam in the steam engine into the sound insulation substrate through the steam mold. Control the pressure of the steam engine to 35MPa, control the heating temperature of the steam mold to 235℃, and keep the heating time at 25s. (8) Mold closing, molding and cutting: The mixed felt heated by steam is laid in the cold forming mold in two layers, and an adhesive is applied between the two layers. The cold forming mold is closed, the pressure of the main cylinder of the molding press is 10MPa, and the pressure holding time is 40s. After molding, the robot grabs it and places it on the cutting equipment to cut it into specific sizes to obtain the required product.

[0027] like Figures 2 to 5As shown, in order to improve production efficiency and obtain products with good performance, an integrated impregnation and drying machine for this product was designed. Specifically, it includes a liquid storage tank 1, an air inlet 2, a mixing mechanism 3, a flow stabilizing mechanism 4, a lifting mechanism 5, and a driving mechanism 6. Support legs are installed at the bottom of the liquid storage tank 1. An inlet 8 and an outlet 9 are respectively provided on both sides of the liquid storage tank 1. The air inlet 2 is installed on the outside of the inlet 8 and outlet 9 and is used to blow away the liquid located inside the inlet 8 and outlet 9. A drying device is also installed inside the air inlet 2 located on the outlet 9 side. The dry assembly 10 is used to dry the mixed felt. The mixing mechanism 3 is installed in the liquid storage tank 1 and is used to stir the liquid in the liquid storage tank 1 to form a circulation. The flow stabilizing mechanism 4 is installed in the liquid storage tank 1 and is driven by the drive mechanism 6 to the air inlet box 2 located on the side of the discharge port 9 to realize the opening and closing of the flow stabilizing mechanism 4. The flow stabilizing mechanism 4 is used to make the liquid on both sides of the liquid storage tank 1 tend to be stable. The lifting mechanism 5 is installed at the bottom of the liquid storage tank 1 and is used to lift the liquid in the liquid storage tank 1 and can drive the mixing mechanism 3 to operate when it reaches the highest point.

[0028] In this embodiment, the air intake box 2 includes an end plate 21 and a cover 22. Air intake pipes 23 are installed at both the upper and lower ends of the cover 22. Guide holes 24 for the mixing felt to pass through are provided on both the end plate 21 and the cover 22. The length of the air inlet box 2 located on one side of the discharge end is greater than the length of the other air inlet box 2. A guide block 101 is installed in the air inlet box 2 located on the discharge end side to divide the airflow entering the air inlet box 2 into two parts. One part enters the liquid storage tank 1, and the other part enters the drying component 10. The drying component 10 includes an electric heating grid 102 and an air guide plate 103 symmetrically arranged in the air inlet box 2. The electric heating grid 102 and the air guide plate 103 are both horizontally installed in the air inlet box, and the air guide plate 103 is located on the upper and lower sides of the mixing felt. The air guide plate 103 is provided with several inclined ventilation holes 104. The electric heating grid 102, the cover 22, and the guide block 101 constitute a drying chamber.

[0029] In this embodiment, there are two mixing mechanisms 3 symmetrically installed in the storage tank 1. Specifically, they include a rotating frame 31, a gear ring 32, stirring blades 33, and a rotating shaft 34. The rotating shaft 34 is installed on the rotating frame 31 and one end of it is rotatably connected to the side wall of the storage tank 1. Waterproof sealing treatment should be done here. The gear ring 32 is installed on the outer ring of the rotating frame 31. Several stirring blades 33 are installed on the outer ring of the rotating frame 31 on one side of the gear ring 32. The stirring blades 33 are arranged circumferentially along the axis of the rotating frame 31. The two rotating shafts 34 are connected by a coupling 35 to form a whole. The lifting mechanism 5 includes a base plate 51, a hydraulic cylinder 52, and a guide column 53. The base plate 51 is slidably connected to the liquid storage tank 1, and its lower end is connected to the output end of the hydraulic cylinder 52. The guide column 53 is fixed to the bottom surface of the base plate 51 and slidably connected to the bottom of the liquid storage tank 1. Two power mechanisms 7 are symmetrically installed on the top surface of the base plate 51, specifically including two symmetrically arranged supports 72. A drive gear 72 is rotatably connected to the support 72, and one of the drive gears 72 is connected to the output end of the drive motor 73.

[0030] In this embodiment, the flow stabilizing mechanism 4 includes two symmetrically arranged flow stabilizing plates 41. The flow stabilizing plates 41 are provided with several through holes 42 and U-shaped notches 43 that cooperate with the rotating shaft 34. When the flow stabilizing plates 41 move up and down, the rotating shaft 34 slides in the U-shaped notches 43, so there is no interference with the rotating shaft 34. Telescopic mechanisms 44 are installed on the front and rear sides of the flow stabilizing plates 41. The telescopic mechanisms 44 are fixed in the liquid storage tank 1 by means of a horizontal plate 444. The telescopic mechanism 44 includes a piston cylinder 441, a piston rod 442 and a piston 443. The piston cylinder 441 is installed on the horizontal plate 444. The lower end of the piston rod 442 is connected to the piston 443 and is slidably connected in the piston cylinder 441 by means of the piston 443. The lower end of the piston cylinder 441 is provided with an air inlet 445. The drive mechanism 6 includes a straight pipe 61, a slide rod 62, a drive rod 63, and a support plate 64. The straight pipe 61 is fixed to the outside of the liquid storage tank 1 by a side plate on its side. The straight pipe 61 is provided with a transverse air inlet channel 65 and an air outlet channel 66, which are coaxially arranged. The air inlet channel 65 and the air outlet channel 66 are connected to the drying chamber and the air inlet 445 respectively by connecting pipes. Since there are multiple piston cylinders 441, the connecting pipes connected to the piston cylinders 441 form an "I"-shaped connection layout, which finally converges at the air outlet channel 66. The slide rod 62 is slidably connected inside the straight pipe 61 and its lower end is connected to the drive rod 63. The drive rod 63 is installed at one end of the support plate 64, and the other end of the support plate 64 is connected to the guide post 53. The lower part of the slide rod 62 is provided with a connecting hole 67 that cooperates with the air inlet channel 65, and the upper part of the slide rod 62 is provided with an L-shaped pressure relief hole 68, the upper end of which is connected to the atmosphere.

[0031] The working principle of the drying and gluing integrated machine in this invention is as follows: After being needle-punched, the mixed felt enters the storage tank 1 through the guide hole 24 of the air inlet box 2 located on the side of the inlet 8 and the inlet 8, and is then discharged through the guide hole 24 of the air inlet box 2 on the side of the outlet 9 and the outlet 9. During this process, a blower introduces high-speed gas into the air inlet pipe 23. Then, the hydraulic cylinder 52 is activated, the base plate 51 rises, and the liquid flame retardant in the storage tank 1 rises to a certain height. This height can be detected by the liquid level sensor 11 and transmitted to the control center. When the liquid level is insufficient, liquid flame retardant can be added to the storage tank 1. Gas is discharged into the storage tank 1 through the inlet 8 and outlet 9, blowing away the liquid flame retardant on one side of the inlet 8 and outlet 9 to form a recessed buffer zone (without liquid flame retardant). The raised liquid surface submerges the mixed felt, achieving the impregnation treatment of the flame retardant. When the impregnated mixed felt passes through the drying assembly 10, the electric heating grid 102 is energized, and the high-speed gas introduced through the air inlet pipe 23 also enters the drying chamber. The heated air is blown onto the mixed felt through the vent 104 to dry it. The upper end of the vent 104 is close to the outlet 9. In the above process, the working process of the flow stabilizing mechanism 4 and the mixing mechanism 3 is as follows: After the base plate 51 rises to its highest point, the drive gear 72 contacts the gear ring 32, and the drive motor 73 is started at the same time. The drive motor 73 drives the drive gear 72 to rotate, which in turn drives the rotating frame 31 to rotate. Therefore, the liquid flame retardant is mixed and stirred to form a circulation, which is conducive to the uniform impregnation of the flame retardant.

[0032] As the base plate 51 rises, the guide column 53 also rises, driving the drive rod 63 and slide rod 62 to rise. Finally, the connecting hole 67 on the slide rod 62 connects to the air inlet channel 65 and the air outlet channel 66, allowing the airflow in the drying chamber to enter the piston cylinder 441, driving the piston rod 442 and the flow stabilizer plate 41 to rise. The rise of the flow stabilizer plate 41 can stabilize the liquid flame retardant at the inlet 8 and outlet 9, preventing large fluctuations in the liquid level at these two locations caused by the stirring of the mixing mechanism 3, and reducing the probability of the flame retardant entering the inlet 8 and outlet 9. When the base plate 51 descends and returns to its original position, the drive gear 72 disengages from the gear ring 32, the mixing mechanism 3 stops operating, and the slide rod 62 descends, connecting the pressure relief hole 68 to the air outlet channel 66, allowing the gas in the piston cylinder 441 to flow into the atmosphere, and the flow stabilizer plate 41 descends and returns to its original position.

[0033] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A sound-absorbing, noise-reducing, and flame-retardant material, characterized in that, The materials include the following parts by weight: The materials consist of 5-10 parts carbon fiber, 15-30 parts recycled cotton fiber, 2-6 parts polyester fiber, 15-20 parts low-melting-point thermoplastic fiber, and 20-30 parts non-woven fiber. The specifications of the above materials are: 6-20D in diameter and 20-100mm in length.

2. A method for preparing the sound-absorbing, noise-reducing, and flame-retardant material according to claim 1, characterized in that, Includes the following steps: (1) Opening treatment: Take a certain amount of carbon fiber, recycled cotton fiber, polyester fiber, low melting point thermoplastic fiber and non-woven fiber according to the proportion, feed and mix them through five electronic opening machines, and then the mixing unit conveyor curtain transports the mixed raw materials to the fine opening machine for opening and dispersing. Then, the carding machine is used to card them evenly, and then the above mixed fibers are laid into a mixed fiber web by the web laying machine. (2) First needle punching: The fiber web is fed into the needle punching machine for the first needle punching. The needle punching frequency is 40-50 Hz and the needle punching density is 310-330 needles / cm. 2 The needle-punching depth is 7-10mm, forming a preliminary mixed felt; (3) Impregnation and drying: The mixed felt is passed horizontally through the impregnation and drying machine. The mixed felt is first passed through the liquid flame retardant in the impregnation and drying machine and the flame retardant is impregnated on its surface. Then it is quickly dried by the drying component at the tail of the impregnation and drying machine to dry the liquid flame retardant on its surface. During this process, the feeding speed of the mixed felt is 10-15cm / s and the drying temperature is 185-200℃. (4) Baking: The above-dried mixed felt is then baked at a temperature of 150-170℃ for 45-60s. (5) Washing and drying: The above-baked mixed felt is washed with water and then dried. (6) Secondary needle punching: The mixed felt dried in step (6) is subjected to a second needle punching process to obtain a semi-finished mixed felt. The needle punching frequency is 30-40 Hz and the needle punching density is 230-250 needles / cm. 2 The needle insertion depth is 1-2 mm; (7) Steam injection: Cut the semi-finished mixed felt after needle punching in step (6) into blocks and put them into the steam mold. Close the steam mold and inject the steam from the steam generator into the sound insulation substrate through the steam mold. (8) Mold closing, molding and cutting: The mixed felt heated by steam is laid in the cold forming mold in two layers, and an adhesive is applied between the two layers. The cold forming mold is closed. After molding, the robot grabs it and places it on the cutting equipment to cut it into specific sizes to obtain the required product.

3. The method for preparing a sound-absorbing, noise-reducing, and flame-retardant material according to claim 2, characterized in that: In step (7), the pressure of the steam engine is controlled at 30-35 MPa, the heating temperature of the steam mold is controlled at 230-235℃, and the heating time is maintained at 25-35 s.

4. The method for preparing a sound-absorbing, noise-reducing, and flame-retardant material according to claim 2, characterized in that: In step (8), the pressure of the main cylinder of the molding machine is 8-10 MPa, and the pressure holding time is 40-45 s.

5. The method for preparing a sound-absorbing, noise-reducing, and flame-retardant material according to claim 2, characterized in that: The impregnation and drying integrated machine includes a liquid storage tank (1), an air inlet box (2), a mixing mechanism (3), a flow stabilizing mechanism (4), a lifting mechanism (5), and a driving mechanism (6). The bottom of the liquid storage tank (1) is equipped with support legs. The liquid storage tank (1) has an inlet (8) and an outlet (9) on both sides. The air inlet box (2) is installed on the outside of the inlet (8) and the outlet (9) and is used to blow away the liquid located inside the inlet (8) and the outlet (9). A drying component (10) is also installed in the air inlet box (2) located on the side of the outlet (9) to realize the drying treatment of the mixed felt. The mixing mechanism (3) is installed in the liquid storage tank (1) and is used to stir the liquid in the liquid storage tank (1) to form a circulation. The flow stabilizing mechanism (4) is installed in the liquid storage tank (1) and is driven by the driving mechanism (6) to the air inlet box (2) located on the side of the outlet (9) to realize the opening and closing of the flow stabilizing mechanism (4). The flow stabilizing mechanism (4) is used to make the liquid on both sides of the liquid storage tank (1) tend to be stable. The lifting mechanism (5) is installed at the bottom of the liquid storage tank (1) and is used to lift the liquid in the liquid storage tank (1) and can drive the mixing mechanism (3) to operate when it reaches the highest point.

6. The method for preparing a sound-absorbing, noise-reducing, and flame-retardant material according to claim 5, characterized in that: The air inlet box (2) includes an end plate (21) and a cover (22). Air inlet pipes (23) are installed at both the upper and lower ends of the cover (22). Guide holes (24) for the mixing felt to pass through are provided on both the end plate (21) and the cover (22). The length of the air inlet box (2) located on one side of the discharge end is greater than the length of the other air inlet box (2). A guide block (101) is installed in the air inlet box (2) located on one side of the discharge end and divides the airflow entering the air inlet box (2) into two parts. One part enters the liquid storage tank (1) and the other part enters the drying component (10). The drying component (10) includes an electric heating mesh (102) and a guide plate (103) symmetrically arranged in the air inlet box (2). The guide plate (103) is provided with several inclined ventilation holes (104). The electric heating mesh (102) and the guide plate (103) are both horizontally installed in the air inlet box, and the guide plate (103) is located on the upper and lower sides of the mixing felt. The electric heating mesh (102), the cover (22), and the guide block (101) constitute a drying chamber.

7. The method for preparing a sound-absorbing, noise-reducing, and flame-retardant material according to claim 5, characterized in that: The mixing mechanism (3) has two parts and is symmetrically installed in the storage tank (1). Specifically, it includes a rotating frame (31), a gear ring (32), stirring blades (33), and a rotating shaft (34). The rotating shaft (34) is installed on the rotating frame (31) and one end of it is rotatably connected to the side wall of the storage tank (1). The gear ring (32) is installed on the outer ring of the rotating frame (31). Several stirring blades (33) are installed on the outer ring of the rotating frame (31) on one side of the gear ring (32). The stirring blades (33) are arranged circumferentially along the axis of the rotating frame (31). The two rotating shafts (34) are connected by a coupling (35) to form a whole. The lifting mechanism (5) includes a base plate (51), a hydraulic cylinder (52), and a guide column (53). The base plate (51) is slidably connected to the liquid storage tank (1), and its lower end is connected to the output end of the hydraulic cylinder (52). The guide column (53) is fixed to the bottom surface of the base plate (51) and slidably connected to the bottom of the liquid storage tank (1). Two power mechanisms (7) are symmetrically installed on the top surface of the base plate (51), specifically including two symmetrically arranged supports (72). A drive gear (72) is rotatably connected to the support (72), and one of the drive gears (72) is connected to the output end of the drive motor (73).

8. The method for preparing a sound-absorbing, noise-reducing, and flame-retardant material according to claim 5, characterized in that: The flow stabilizing mechanism (4) includes two symmetrically arranged flow stabilizing plates (41). The flow stabilizing plates (41) are provided with several through holes (42) and a U-shaped notch (43) that cooperates with the rotating shaft (34). Telescopic mechanisms (44) are installed on the front and rear sides of the flow stabilizing plates (41). The telescopic mechanisms (44) are fixed in the liquid storage tank (1) by means of a horizontal plate (444). The telescopic mechanism (44) includes a piston cylinder (441), a piston rod (442) and a piston (443). The piston cylinder (441) is installed on the horizontal plate (444). The lower end of the piston rod (442) is connected to the piston (443) and is slidably connected in the piston cylinder (441) by means of the piston (443). The lower end of the piston cylinder (441) is provided with an air inlet (445). The drive mechanism (6) includes a straight pipe (61), a slide rod (62), a drive rod (63), and a support plate (64). The straight pipe (61) is provided with a transverse air inlet channel (65) and an air outlet channel (66), which are coaxially arranged. The air inlet channel (65) and the air outlet channel (66) are connected to the drying chamber and the air inlet (445) respectively through connecting pipes. The slide rod (62) is slidably connected inside the straight pipe (61), and its lower end is connected to the drive rod (63). The drive rod (63) is installed on one end of the support plate (64), and the other end of the support plate (64) is connected to the guide post (53). The lower part of the slide rod (62) is provided with a connecting hole (67) that cooperates with the air inlet channel (65). The upper part of the slide rod (62) is provided with an L-shaped pressure relief hole (68), and the upper end of the pressure relief hole (68) is connected to the atmosphere.

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