Granulation process of aluminum-plastic plate fireproof sandwich body based on composite fiber as main body

Abstract

The invention discloses a granulation process of a fireproof sandwich body of an aluminum-plastic panel based on a composite fiber as a main body, and the sandwich body composite material comprises the following components in parts by weight: 14-17 parts of polyethylene fiber, 15-17 parts of polypropylene fiber, 8-12 parts of glass fiber, 28-32 parts of magnesium hydroxide, 18-24 parts of aluminum hydroxide, 4-6 parts of calcium stearate and 3-8 parts of a halogen-free composite flame retardant. The technology comprises the following steps that S1, waste materials including polyethylene fibers and polypropylene fibers are shredded into small blocks through a shredding device, and then the shredded waste materials are crushed through a crushing device to obtain fine crushed materials; s2, fine crushed materials obtained through crushing treatment are screened through a screening device and collected and stored through a waste collecting bin; s3, uniformly mixing the materials in the plurality of finished product bins and the materials in the waste collecting bin; s4, primary extrusion granulation; s5, carrying out secondary extrusion granulation; the matched composite material in the sandwich body particles provided by the invention can be stable in co-melting, and has good flame-retardant property and mechanical property.

Description

Technical Field

[0001] The invention belongs to the technical field of application of building fireproof materials, and particularly relates to a granulation process for a fireproof sandwich body of an aluminum-plastic plate based on composite fibers as a main body. Background Art

[0002] Aluminum-plastic panel is the abbreviation of aluminum-plastic composite panel, which is a kind of building decoration material with fireproof performance. It is widely used because of its good fireproof performance. In order to further improve its fireproof performance, it is necessary to add flame retardant, that is, a flame retardant sandwich body during the production process to improve the flame retardant effect. The choice of flame retardant or sandwich body is diverse.

[0003] After searching, the flame retardant core layer of aluminum-plastic plate and aluminum-plastic plate with prior art announcement number CN109111617A, the main points of its technical solution are, by weight, 30-50 parts of base resin, 30-40 parts of flame retardant, 0.5-1.5 parts of flame retardant synergist, 1-2 parts of anionic surfactant, 2-4 parts of compatibilizer, 1-2 parts of antioxidant and 0.5-1.5 parts of antibacterial agent; the base resin includes low-density polyethylene, polypropylene, ethylene-octene copolymer and ethylene-ethyl acrylate, and the weight ratio of the low-density polyethylene, polypropylene, ethylene-octene copolymer and ethylene-ethyl acrylate copolymer is 6:2:1:1; the flame retardant includes magnesium hydroxide and expandable graphite, and the weight ratio of magnesium hydroxide to expandable graphite is 6:1;

[0004] The prior art announcement number is CN 116478463 A. A fireproof aluminum-plastic plate core material and a preparation process thereof, comprising 15-30 parts of low-density polyethylene, 5-15 parts of ethylene-octene copolymer, 30-50 parts of aluminum hydroxide, 10-15 parts of anhydrous magnesium carbonate, 5-10 parts of calcium stearate, 5-8 parts of silicon dioxide, 8-15 parts of coupling agent, 5-10 parts of smoke suppressant, 1-3 parts of reinforcing and toughening agent, 0.1-0.5 parts of titanium dioxide, 0.2-0.5 parts of halogen-free composite flame retardant, 0.1-0.5 parts of surface treatment agent, 0.1-0.5 parts of PE and 5-10 parts of modified resin;

[0005] The above technical process is still not very ideal in terms of the effect of use; the granular matrix resin will be relatively dispersed during the filling process and it is difficult to mix and form a polymer to constitute a continuous whole; secondly, the various materials cannot promote co-fusion well, and the flame retardancy of various composite flame retardant materials cannot be improved as a whole. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a granulation process for a fireproof sandwich body of an aluminum-plastic plate based on composite fibers as the main body. The sandwich body particles provided by the present invention have good flame retardancy. By optimizing the ratio and extrusion treatment, the composite material with the composite fibers as the main body can have stability and flame retardancy, and various composite materials can be co-integrated and stable.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A granulation process for a fireproof aluminum-plastic plate sandwich body based on composite fibers. The sandwich composite material comprises, by weight, 14-17 parts of polyethylene fibers, 15-17 parts of polypropylene fibers, 8-12 parts of glass fibers, 28-32 parts of magnesium hydroxide, 18-24 parts of aluminum hydroxide, 4-6 parts of calcium stearate, and 3-8 parts of a halogen-free composite flame retardant.

[0009] The steps for preparing the fireproof sandwich body are as follows:

[0010] S1: The waste materials including polyethylene fibers and polypropylene fibers are shredded into small pieces by a shredding device, and then the shredded waste materials are pulverized by a pulverizing device to obtain fine fragments;

[0011] S2: The finely divided materials obtained by the crushing process are then screened by a screening device and collected and stored in a waste collection bin;

[0012] The above-mentioned screening device includes a screening machine, a hood, a blower, a first leg, a collecting box, and an adjusting support mechanism; the hood is arranged above the screening machine and closes and wraps the screening channel of the screening machine, the hood is provided with a suction duct for suction, the blower is arranged below the screening machine for blowing and cooperating with vibration screening to improve the screening effect, and at the same time the suction effect of the hood blows away and collects the screened powder; the first leg is arranged at one end of the screening machine, the first leg is provided with a rotating shaft and is rotatably connected to the discharging end of the screening machine; the adjusting support mechanism and the collecting box are arranged at the other end of the screening machine; the adjusting support mechanism includes a second leg and a fixed block, the second leg is provided with a slide groove, the second legs are arranged on both sides of the screening machine, the second legs are connected by a connecting plate, the fixed block is provided with a rotatably connected support shaft and A fixedly connected limit rod, two ends of the support shaft are provided with rotatably connected support blocks, the support block is provided with a T-block, the T-block is arranged in the T-slot, the limit rod is inserted and fits the slide slot, one end of the fixed block is provided with a threaded screw, one end of the screw is rotatably connected to the connecting plate, one end of the screw is provided with a bevel gear, and the second leg is provided with a rotatably connected adjustment shaft, one end of the adjusting shaft is provided with a bevel gear and meshes with the bevel gear at one end of the screw, and the screw is driven to rotate by rotating the adjusting shaft, thereby driving the fixed block to move along the slide slot, thereby driving the height of the screening machine to be adjusted. At this time, one end of the screening machine rotates and adjusts with the rotating shaft as the axis, and the support block slides in the T-slot to ensure the position of the fixed block and complete the height adjustment of the screening machine; so that the inclination of the screening machine can better realize screening and discharging.

[0013] S3: The materials respectively contained in several finished product bins, including glass fiber, magnesium hydroxide, aluminum hydroxide, calcium stearate, halogen-free composite flame retardant, and ground polyethylene fiber and polypropylene fiber in the waste collection bin, are sequentially transported to the mixing mechanism through the conveying mechanism; and stirred by the mixing mechanism to make them evenly mixed.

[0014] The above-mentioned mixing mechanism includes a mixing tank, a lifting mechanism, a stirring mechanism, and a bulking mechanism. The lifting mechanism, the stirring mechanism, and the bulking mechanism are arranged in the mixing tank. A cover plate is provided on the top of the mixing tank, and a feed port is provided on the cover plate; legs, a barrel, and a trough are provided at the bottom of the mixing tank, and a discharge switch is provided on the barrel to control the discharge; the lifting mechanism includes a first motor, a roller, and an auger blade; the first motor is fixed on the cover plate, one end of the roller is fixedly connected to the bottom end of the mixing tank, and a feed trough is provided at the bottom of the roller; the auger blade is arranged in the roller, and the main shaft of the auger blade is rotatably connected to the mixing tank, and the output end of the first motor is connected to the main shaft of the auger blade; the lifting mechanism can lift the blended material at the bottom of the mixing tank to the top to realize the exchange of the top and bottom blended materials, which helps to improve the mixing effect.

[0015] The stirring mechanism includes a second motor, a stirring shaft, and stirring blades; the stirring shaft is provided with several groups, both ends of the stirring shaft are rotatably connected to a fixed plate, the fixed plate is fixedly connected to the inner wall of the mixing tank, the stirring blades are fixed on the stirring shaft, one end of the stirring shaft is rotatably connected to a cover plate and a sprocket is provided at the shaft end, and the sprockets are connected by a chain; the second motor is fixed to the cover plate through a motor seat, and the output shaft of the second motor is connected to one of the auxiliary stirring shafts to provide power therefor, thereby driving the stirring blades to stir the materials.

[0016] The bulk material mechanism includes a third motor, a conical cylinder, a support arm, a connecting shaft, an inner gear disk, and a support plate; the conical cylinder is sleeved with a roller, and the support plate is fixedly connected to the outer wall of the roller for supporting the conical cylinder; the support arm, the connecting shaft, and the conical cylinder are fixedly connected, and the inner gear disk is fixedly connected to the connecting shaft; the third motor is fixed on the cover plate, and a gear is provided at the shaft end of the third motor and meshes with the inner gear disk; the inner gear disk is driven to rotate by the third motor, and then the conical cylinder is driven to rotate to quickly rotate the blended material lifted to the top, which is helpful for mixing the bulk materials.

[0017] Among them, the rotation speed of the third motor in the dispersing mechanism is 5-8 times that of the first motor in the lifting mechanism. The lifted blended material is quickly dispersed through the rapid rotation of the conical barrel, which helps to further improve the mixing effect.

[0018] S4: One-step extrusion granulation: The blended materials evenly mixed in the mixing mechanism are transmitted to the one-step extrusion granulation through the transmission mechanism for extrusion granulation. The temperature of the one-step extrusion granulation is set to 80-100°C.

[0019] S5: Two-pass extrusion granulation: The pellets produced by the first extrusion granulation are transferred to the second extrusion granulation mechanism for two-pass extrusion granulation, and the temperature is set to 100-130°C; repeated extrusion granulation; further, screening is performed through a screening device, and the granular material enters the product storage, and the powder produced by the second extrusion granulation is screened and collected and transferred together with the pellets produced by the first extrusion granulation into the second extrusion granulation for re-granulation.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1) The composite material of the fireproof sandwich body of the aluminum-plastic plate based on the composite fiber is optimized in proportion and extrusion treatment, so that the composite material with the composite fiber as the main body can have stability and flame retardancy, and various composite materials can be fused and stabilized, and have good flame retardant properties and mechanical properties. Among them, the polypropylene fiber improves and enhances its mechanical properties and tensile strength, and can also improve the antifreeze and fatigue resistance of the aluminum-plastic plate, improve its durability, and help improve the overall stability of the sandwich material. Calcium stearate improves and enhances the stability and flame retardancy of the composite material and enables various materials to be fused and stabilized to avoid discontinuous dispersion; secondly, magnesium hydroxide improves and enhances the thermal stability and low toxicity of the composite material, does not produce corrosive gas, and decomposes water vapor and magnesium oxide when heated. Water vapor can dilute combustible gas and inhibit combustion;

[0022] 2) The mixing mechanism can improve and promote the uniform mixing of various materials in the composite material; wherein, the lifting mechanism can lift the blended material at the bottom of the mixing tank to the top to achieve the exchange of the top and bottom blended materials, which is helpful to improve the mixing effect; and then the lifted blended material is dispersed by the dispersing mechanism; the third motor drives the inner gear disc to rotate, and then drives the cone barrel to rotate, which is helpful to the mixing of materials by dispersing the blended material lifted to the top through high-speed rotation; and the stirring mechanism is used to stir the blended material during the exchange of the top and bottom blended materials, which greatly improves its mixing uniformity;

[0023] Secondly, the missed powder produced by the first extrusion granulation and the second extrusion granulation needs to be collected and enter the second extrusion granulation for re-granulation together with the first extrusion granulation, thereby avoiding the waste of materials and making the prepared composite material get circular extrusion and re-granulation without any powder pollution and waste of proportioned materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Attached Figure 1 It is a schematic diagram of a mixing mechanism in a granulation process structure of an aluminum-plastic plate fireproof sandwich body based on composite fibers as the main body of the present invention;

[0025] Attached Figure 2 It is a schematic diagram of the internal structure of a mixing tank in a granulation process of an aluminum-plastic plate fireproof sandwich body based on composite fibers as the main body of the present invention;

[0026] Attached Figure 3 It is a structural diagram of the bulk material mechanism;

[0027] Attached Figure 4 It is a structural diagram of the lifting mechanism;

[0028] Attached Figure 5 It is a structural schematic diagram of a shredding device in a granulation process of an aluminum-plastic plate fireproof sandwich body based on composite fibers as a main body according to the present invention;

[0029] Attached Figure 6 It is a structural schematic diagram of a screening device in a granulation process of an aluminum-plastic plate fireproof sandwich body based on composite fibers as the main body of the present invention;

[0030] Attached Figure 7 It is a schematic diagram of the structure of the adjustment support mechanism

[0031] Attached Figure 8 This is a granulation process flow chart of a fireproof sandwich body of an aluminum-plastic plate based on composite fibers as the main body of the present invention;

[0032] In the figure: 1. shredding device; 2. screening device; 21. screening machine; 211. T-slot; 22. wind hood; 221. suction air duct; 24. blower; 25. first leg; 251. rotating shaft; 26. collecting box; 27. adjusting support mechanism; 271. fixing block; 2711. supporting shaft; 272. supporting block; 273. T-block; 274. limiting rod; 275. lead screw; 276. adjusting shaft; 277. second leg; 278. slideway; 279. connecting plate; 3. mixing mechanism; 31. mixing Combined tank; 311, support leg; 312, barrel; 313, chute; 32, lifting mechanism; 321, first motor; 322, roller; 3221, feed chute; 323, auger blade; 334, fixed plate; 33, stirring mechanism; 331, second motor; 332, stirring shaft; 333, stirring fan blade; 34, bulk material mechanism; 341, third motor; 342, conical barrel; 343, support arm; 344, connecting shaft; 345, inner gear disc; 346, support plate; 35, cover plate; 351, feed port. DETAILED DESCRIPTION

[0033] To facilitate the understanding of those skilled in the art, Figure 1-8 , the technical solution of the present invention is further specifically described.

[0034] Embodiment 1:

[0035] A granulation process for a fireproof aluminum-plastic plate sandwich body based on composite fibers. The sandwich composite material comprises, by weight, 15 parts of polyethylene fibers, 15 parts of polypropylene fibers, 10 parts of glass fibers, 30 parts of magnesium hydroxide, 20 parts of aluminum hydroxide, 5.5 parts of calcium stearate, and 5 parts of a halogen-free composite flame retardant.

[0036] Fireproof sandwich preparation process steps:

[0037] S1: The waste materials including polyethylene fibers and polypropylene fibers are shredded into small pieces by a shredding device 1, and then the shredded waste materials are pulverized by a pulverizing device to obtain fine fragments;

[0038] S2: The finely divided materials obtained by the crushing process are then screened by the screening device 2 and collected and stored in the waste collection bin;

[0039] The screening device 2 comprises a screening machine 21, a hood 22, a blower 24, a first leg 25, a collecting box 26, and an adjusting support mechanism 27; the hood 22 is arranged above the screening machine 21 and closes the screening passage of the screening machine 21, the hood 22 is provided with a suction duct 221 for suction, the blower 24 is arranged below the screening machine 21 for blowing and cooperating with vibration screening to improve the screening effect, and at the same time, the suction effect of the hood 22 blows away and collects the screened powder; the first leg 25 is arranged above the screening machine 21 and closes the screening passage of the hood 21, and the suction duct 221 is provided on the hood 22 for suction, and the blower 24 is arranged below the screening machine 21 for blowing and cooperating with vibration screening to improve the screening effect, and at the same time, the suction effect of the hood 22 blows away and collects the screened powder; the first leg 25 is arranged above the screening machine 21 and closes the screening passage of the hood ... The first leg 25 is provided with a rotating shaft 251 at one end of the screening machine 21 and is rotatably connected to the discharge end of the screening machine 21; the adjusting support mechanism 27 and the collecting box 26 are arranged at the other end of the screening machine 21; the adjusting support mechanism 27 includes a second leg 277 and a fixing block 271, the second leg 277 is provided with a slide groove 278, the second legs 277 are arranged on both sides of the screening machine 21, the second legs 277 are connected by a connecting plate 279, and the fixing block 271 is provided with a rotatably connected support shaft 2711 and a fixed connection The limiting rod 274 is connected to the support shaft 2711, and the two ends of the support shaft 2711 are provided with a rotatably connected support block 272, and the support block 272 is provided with a T-block 273, and the T-block 273 is arranged in the T-slot 211. The limiting rod 274 is inserted and fits into the slide groove 278, and one end of the fixed block 271 is provided with a threaded screw 275, and one end of the screw 275 is rotatably connected to the connecting plate 279, and one end of the screw 275 is provided with a bevel gear. The second leg 277 is provided with a rotatably connected adjustment shaft 276, and the adjustment shaft 276 A bevel gear is provided at one end and meshes with the bevel gear at one end of the lead screw 275. The lead screw 275 is driven to rotate by rotating the adjusting shaft 276, thereby driving the fixed block 271 to move along the slide groove 278, thereby driving the height of the screening machine 21 to be adjusted. At this time, one end of the screening machine 21 is rotated and adjusted with the rotating shaft 251 as the axis, and the supporting block 272 slides in the T-slot to ensure the position of the fixed block 271 and complete the height adjustment of the screening machine 21, so that the inclination of the screening machine 21 can better realize screening and discharging.

[0040] S3: The materials respectively contained in several finished product bins, including glass fiber, magnesium hydroxide, aluminum hydroxide, calcium stearate, halogen-free composite flame retardant and ground polyethylene fiber and polypropylene fiber in the waste collection bin, are transported to the mixing mechanism in sequence through the conveying mechanism; and stirred by the mixing mechanism 3 to make them evenly mixed.

[0041] The mixing mechanism 3 comprises a mixing tank 31, a lifting mechanism 32, a stirring mechanism 33, and a bulking mechanism 34. The lifting mechanism 32, the stirring mechanism 33, and the bulking mechanism 34 are arranged in the mixing tank 31. A cover plate 35 is arranged on the top of the mixing tank 31, and a feed inlet 351 is arranged on the cover plate 35. The bottom of the mixing tank 31 is provided with a support leg 311, a barrel 312, and a drain trough 313. The barrel 312 is provided with a discharge switch to control the discharge. The lifting mechanism 32 comprises a first motor 321, a roller 322, and an auger. Blades 323; the first motor 321 is fixed on the cover plate 35, one end of the roller 322 is fixedly connected to the bottom end of the mixing tank 31, and a feed trough 3221 is provided at the bottom of the roller 322; the auger blade 323 is provided in the roller 322, the main shaft of the auger blade 323 is rotatably connected to the mixing tank 31, and the output end of the first motor 321 is connected to the main shaft of the auger blade 323; the lifting mechanism 32 can lift the blended material at the bottom of the mixing tank 31 to the top to realize the exchange of the top and bottom blended materials, which helps to improve the mixing effect.

[0042] The stirring mechanism 33 includes a second motor 331, a stirring shaft 332, and stirring blades 333; the stirring shaft 332 is provided with several groups, both ends of the stirring shaft 332 are rotatably connected to the fixed plate 334, the fixed plate 334 is fixedly connected to the inner wall of the mixing tank 31, the stirring blades 333 are fixed on the stirring shaft 332, one end of the stirring shaft 332 is rotatably connected to the cover plate 35 and a sprocket is provided at the shaft end, and the sprockets are connected by a chain; the second motor 331 is fixed to the cover plate 35 through a motor seat, and the output shaft of the second motor 331 is connected to one of the pair of stirring shafts 332 to provide power for it, thereby driving the stirring blades 333 to stir the materials.

[0043] The bulking mechanism 34 includes a third motor 341, a conical cylinder 342, a support arm 343, a connecting shaft 344, an inner gear disc 345, and a support plate 346; the conical cylinder 342 is sleeved on the roller 322, and the support plate 346 is fixedly connected to the outer wall of the roller 322 for supporting the conical cylinder 342; the support arm 343, the connecting shaft 344, and the conical cylinder 342 are fixedly connected, and the inner gear disc 345 is fixedly connected to the connecting shaft 344; the third motor 341 is fixed on the cover plate 35, and a gear is provided at the shaft end of the third motor 341 and meshes with the inner gear disc 345; the inner gear disc 345 is driven to rotate by the third motor 341, and then the conical cylinder 342 is driven to rotate, and the blended material lifted to the top is quickly rotated to help mix the bulked materials.

[0044] The rotation speed of the third motor 341 in the dispersing mechanism 34 is six times that of the first motor 321 in the lifting mechanism 32. The lifted blended material is quickly dispersed through the rapid rotation of the conical barrel 342, which helps to further improve the mixing effect.

[0045] S4: One-step extrusion granulation: The blended materials uniformly mixed in the mixing mechanism are transmitted to the one-step extrusion granulation through the transmission mechanism for extrusion granulation. The temperature of the one-step extrusion granulation is set to 90°C.

[0046] S5: Second-pass extrusion granulation: The pellets produced by the first-pass extrusion granulation are transferred to the second-pass extrusion granulation mechanism for second-pass extrusion granulation, and the temperature is set to 120°C; repeated extrusion granulation; further, screening is performed through a screening device, and the pellets enter the product storage, and the powder produced by the second-pass extrusion granulation is screened and collected and transferred together with the pellets produced by the first-pass extrusion granulation into the second-pass extrusion granulation for re-granulation.

[0047] Embodiment 2:

[0048] The difference compared with Example 1 is that,

[0049] The blend includes 16 parts of polyethylene fiber, 17 parts of polypropylene fiber, 9 parts of glass fiber, 32 parts of magnesium hydroxide, 22 parts of aluminum hydroxide, 6 parts of calcium stearate, and 6 parts of halogen-free composite flame retardant.

[0050] The temperature of the first extrusion granulation in step S4 is set to 80°C, and the temperature of the second extrusion granulation in step S5 is set to 100°C.

[0051] Embodiment 3:

[0052] The difference compared with Example 2 is:

[0053] The blend includes 17 parts of polyethylene fiber, 15 parts of polypropylene fiber, 11 parts of glass fiber, 31 parts of magnesium hydroxide, 20 parts of aluminum hydroxide, 5 parts of calcium stearate, and 7 parts of halogen-free composite flame retardant.

[0054] Comparative Example 1:

[0055] The difference compared with Example 2 is that the blend contains 10 parts of polypropylene fiber.

[0056] Comparative Example 2:

[0057] The difference compared with Example 2 is that there are 11 parts of polypropylene fibers in the blend.

[0058] Comparative Example 3:

[0059] The difference compared with Example 2 is that the blend contains 20 parts of polypropylene fibers.

[0060] Comparative Example 4:

[0061] The difference compared with Example 2 is that there are 3 parts of calcium stearate in the blend.

[0062] Comparative Example 5:

[0063] The difference compared with Example 2 is that there are 3.5 parts of calcium stearate in the blend.

[0064] Comparative Example 6:

[0065] The difference compared with Example 2 is that there is 0 part of calcium stearate in the blend.

[0066] Mechanical properties testing standards: The testing standard for tensile strength is GB / T1040.2-2022; the testing standard for elongation at break is GB / T1040.2-2022; the testing standard for impact strength is GB / T1843-2008; the testing standard for flexural strength is GB / T8812.2-2007; the testing standard for oxygen index is GB / T2406.1-2008.

[0067] Tensile strength MPa Elongation at break % <![CDATA[Impact strength KJ / m 2 > Bending strength MPa Oxygen index% Example 1 22.8 30.2 43.2 23.5 34.2 Example 2 22.5 31.5 41.5 24.6 33.8 Example 3 23.1 30.8 42.2 23.8 32.5 Comparative Example 1 19.5 27.6 39.8 19.6 33.6 Comparative Example 2 18.2 27.2 38.2 20.8 32.4 Comparative Example 3 25.6 32.5 44 25.2 33.8 Comparative Example 4 20.5 29.2 41.2 22.2 32.2 Comparative Example 5 20.8 29.1 40.8 21.8 32.4 Comparative Example 6 19.2 27.5 37.8 19.8 28.3

[0068] It can be seen from the above data that the tensile strength, elongation at break, impact strength and bending strength of Examples 1-3 are good, and the data are relatively stable and average; among them, the oxygen index of Examples 1-3 and Comparative Examples 1-6 is >30% and is B1 and the product, that is, a flame retardant material;

[0069] Further analysis found that the amount of polypropylene fiber in Comparative Example 1-2 was lower than the addition standard, so that the tensile strength and elongation at break were lower than those in Examples 1-3, and the amount of polypropylene fiber in Comparative Example 3 was higher than the addition standard, so that the tensile strength and elongation at break were higher than those in Examples 1-3; this indicates that the addition of an appropriate amount of polypropylene fiber can effectively improve the tensile strength and impact resistance, and has good performance in reducing impact and absorbing impact energy;

[0070] The amount of calcium stearate added in Comparative Examples 4-5 is lower than the addition standard, that is, lower than Example 1-3. According to experimental data, the tensile strength and elongation at break of Comparative Examples 4-5 are lower than those of Example 1-3, while the amount of calcium stearate added in Comparative Example 6 is 0 parts, and its tensile strength and elongation at break are slightly lower than those of Comparative Examples 4-5 and meet the inspection standard; therefore, it can be explained that sodium stearate can improve and stabilize the mechanical properties of the material but does not play a decisive role; through the data, it can be found and known that the oxygen index in Comparative Example 6 is significantly lower than that of Comparative Examples 1-5 and Example 1-3 and is lower than 30%, thus illustrating the necessity of adding calcium stearate and the correctness of the standard for adding calcium stearate in the composite material.

[0071] Aluminum-plastic panel combustion performance test: The test standards are: the minimum value of the remaining length after burning is GB / T8625-2005; the average value of the remaining length after burning is GB / T8625-2005; the average smoke temperature is GB / T8625-2005; the smoke density level is GB / T8627-2007.

[0072] The detection and evaluation standards are: Grade A: minimum value of remaining burning length>200mm, average value of remaining burning length≥350m, smoke temperature≤125℃, smoke density level≤15.

[0073] Grade B1: Minimum value of remaining length during combustion > 0mm, average value of remaining length during combustion ≥ 150mm, flue gas temperature ≤ 200℃, smoke density level ≤ 75.

[0074]

[0075] Among them, the fire resistance levels of Comparative Examples 6 and 1-2 are significantly lower than those of Comparative Examples 3-4 and Examples 1-3, indicating that the addition amount standard of calcium stearate and polypropylene fiber in the composite material can improve the flame retardancy and fire resistance level of the composite material.

[0076] Combining the experimental data of Examples 1-3 and Comparative Examples 1-6 and comparing them with each other, it can be seen that the use effect of polypropylene fiber and calcium stearate in the composite material can make the composite material have good mechanical properties and flame retardant effects; in summary, the composite material has good mechanical properties and fire retardant properties.

[0077] In the description of the present invention, unless otherwise specified, "plurality" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0078] In summary, electronic or electrical components including but not limited to motors are components in the prior art, obtained through private customization or purchase, and the electrical connections between the components are conventional circuit connections or electrical connections in the prior art, which are not within the scope of protection of the present invention;

[0079] The above contents are merely examples and explanations of the structure of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the structure of the invention or exceed the scope defined by the claims, they should all fall within the protection scope of the present invention.

Claims

1. A granulation process for a fireproof sandwich body of aluminum-plastic plate based on composite fiber, characterized in that The sandwich composite material comprises, by weight, 14-17 parts of polyethylene fiber, 15-17 parts of polypropylene fiber, 8-12 parts of glass fiber, 28-32 parts of magnesium hydroxide, 18-24 parts of aluminum hydroxide, 4-6 parts of calcium stearate and 3-8 parts of halogen-free composite flame retardant.

2. The granulation process of the aluminum-plastic plate fireproof sandwich body based on composite fiber as the main body according to claim 1 is characterized in that The granulation process steps of the fireproof sandwich body are as follows: S1: The waste materials including polyethylene fibers and polypropylene fibers are shredded into small pieces by a shredding device, and then the shredded waste materials are pulverized by a pulverizing device to obtain fine fragments; S2: The finely divided materials obtained by the crushing process are then screened by a screening device and collected and stored in a waste collection bin; S3: transporting the materials respectively contained in several finished product bins, including glass fiber, magnesium hydroxide, aluminum hydroxide, calcium stearate, halogen-free composite flame retardant, and ground polyethylene fiber and polypropylene fiber in the waste collection bin, to the mixing mechanism in sequence through the conveying mechanism; stirring the materials through the mixing mechanism to make them evenly mixed; S4: One-step extrusion granulation: The blended materials evenly mixed in the mixing mechanism are transmitted to the one-step extrusion granulation through the transmission mechanism for extrusion granulation. The temperature of the one-step extrusion granulation is set to 80-100°C. S5: Two-pass extrusion granulation: The pellets produced by the first extrusion granulation are transferred to the second extrusion granulation mechanism for two-pass extrusion granulation, and the temperature is set to 100-130°C; repeated extrusion granulation; further, screening is performed through a screening device, and the granular material enters the product storage, and the powder produced by the second extrusion granulation is screened and collected and transferred together with the pellets produced by the first extrusion granulation into the second extrusion granulation for re-granulation.

3. The granulation process of the aluminum-plastic plate fireproof sandwich body based on composite fiber as the main body according to claim 2 is characterized in that Step S2, the screening device includes a screening machine, a hood, a blower, a first leg, a collecting box, and an adjustable support mechanism; the hood is arranged above the screening machine and closes and wraps the screening channel of the screening machine, the hood is provided with a suction duct for suction, the blower is arranged below the screening machine for blowing and cooperating with the vibration screening to improve the screening effect, and at the same time, the suction effect of the hood blows away and collects the screened powder; the first leg is arranged at one end of the screening machine, the first leg is provided with a rotating shaft and is rotatably connected to the discharging end of the screening machine; the adjustable support mechanism and the collecting box are arranged at the other end of the screening machine; the adjustable support mechanism includes a second leg and a fixed block, the second leg is provided with a slide groove, the second legs are arranged on both sides of the screening machine, the second legs are connected by a connecting plate, and the fixed block is provided with a rotatably connected support shaft to And a fixedly connected limit rod, two ends of the support shaft are provided with a rotatably connected support block, the support block is provided with a T-block, the T-block is arranged in the T-slot, the limit rod is inserted and fits the slide slot, one end of the fixed block is provided with a threaded screw, one end of the screw is rotatably connected to the connecting plate, one end of the screw is provided with a bevel gear, and the second leg is provided with a rotatably connected adjustment shaft, one end of the adjusting shaft is provided with a bevel gear and meshes with the bevel gear at one end of the screw, and the screw is driven to rotate by rotating the adjusting shaft, thereby driving the fixed block to move along the slide slot, thereby driving the height of the screening machine to be adjusted. At this time, one end of the screening machine rotates and adjusts with the rotating shaft as the axis, and the support block slides in the T-slot to ensure the position of the fixed block and complete the height adjustment of the screening machine; so that the inclination of the screening machine can better realize screening and discharging.

4. The granulation process of the aluminum-plastic plate fireproof sandwich body based on composite fiber as the main body according to claim 2 is characterized in that In step S3, the mixing mechanism includes a mixing tank, a lifting mechanism, a stirring mechanism, and a bulking mechanism. The lifting mechanism, the stirring mechanism, and the bulking mechanism are arranged in the mixing tank. A cover plate is provided on the top of the mixing tank, and a feed port is provided on the cover plate; legs, a barrel, and a trough are provided at the bottom of the mixing tank, and a discharge switch is provided on the barrel to control the discharge; the lifting mechanism includes a first motor, a roller, and an auger blade; the first motor is fixed on the cover plate, one end of the roller is fixedly connected to the bottom end of the mixing tank, and a feed trough is provided at the bottom of the roller; the auger blade is arranged in the roller, the main shaft of the auger blade is rotatably connected to the mixing tank, and the output end of the first motor is connected to the main shaft of the auger blade; the lifting mechanism can lift the blended material at the bottom of the mixing tank to the top to realize the exchange of the top and bottom blended materials, which helps to improve the mixing effect.

5. The granulation process of the aluminum-plastic plate fireproof sandwich body based on composite fiber as the main body according to claim 4, characterized in that The stirring mechanism includes a second motor, a stirring shaft, and stirring blades; the stirring shaft is provided with several groups, both ends of the stirring shaft are rotatably connected to a fixed plate, the fixed plate is fixedly connected to the inner wall of the mixing tank, the stirring blades are fixed on the stirring shaft, one end of the stirring shaft is rotatably connected to a cover plate and a sprocket is provided at the shaft end, and the sprockets are connected by a chain; the second motor is fixed to the cover plate through a motor seat, and the output shaft of the second motor is connected to one of the auxiliary stirring shafts to provide power therefor, thereby driving the stirring blades to stir the materials.

6. The granulation process of the aluminum-plastic plate fireproof sandwich body based on composite fiber as the main body according to claim 4 is characterized in that The bulking mechanism comprises a third motor, a conical cylinder, a support arm, a connecting shaft, an inner gear disc, and a support plate; the conical cylinder is sleeved with a roller, and the support plate is fixedly connected to the outer wall of the roller for supporting the conical cylinder; the support arm, the connecting shaft, and the conical cylinder are fixedly connected, and the inner gear disc is fixedly connected to the connecting shaft; the third motor is fixed on the cover plate, and a gear is provided at the shaft end of the third motor and meshes with the inner gear disc; the inner gear disc is driven to rotate by the third motor, and then the conical cylinder is driven to rotate to quickly rotate the blended material lifted to the top, which is helpful for bulking; Among them, the rotation speed of the third motor in the dispersing mechanism is 5-8 times that of the first motor in the lifting mechanism. The lifted blended material is quickly dispersed through the rapid rotation of the conical barrel, which helps to further improve the mixing effect.

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