Preparation method and preparation device of brominated flame retardant

Abstract

The invention relates to the technical field of brominated flame retardant preparation, and discloses a brominated flame retardant preparation method and a brominated flame retardant preparation device.The brominated flame retardant preparation method comprises the following steps that raw materials are prepared, specifically, bromine and anhydrous AlBr3 are sequentially added into a mixing box; cooling and reacting: cooling to 0-3 DEG C by using brine ice, and slowly adding xylene while stirring; after the lumps disappear, the lumps are cooled to 10-15 DEG C, the remaining xylene is continuously added, and a reaction is conducted for 4-6 h at the temperature of 20 DEG C. According to the preparation method of the brominated flame retardant, through the screening part, small raw materials fall into the bottom in the mixing box and are fully mixed, large caked raw materials stay in the screening part and then are smashed, the caked raw materials are smashed into small particles, the small particles fall from the screening part, and the steps are repeated; the problems that caked raw materials are contained in the raw materials, so that the raw materials are not fully mixed, the mixing efficiency of the raw materials is influenced, and the flame retardant property of the product is possibly influenced are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of brominated flame retardant preparation, and in particular to a brominated flame retardant preparation method and a preparation device. Background Art

[0002] Brominated flame retardants are additives that can prevent plastics and other polymer materials from being ignited or inhibit the spread of flames. They are usually added to various materials, such as electronic product housings, cables, circuit boards, building materials, automotive parts, and aviation materials, to improve the flame retardancy of these materials. According to the chemical structure, brominated flame retardants can be divided into many types, such as brominated aromatic compounds (such as hexabromobiphenyl, hexabromodiphenyl ether, etc.), brominated aliphatic compounds (such as tribromopropane, hexabromohexadecane, etc.), brominated cyclic compounds, etc.

[0003] In the production of brominated flame retardants, various equipment and devices are required, including mixing devices, separation devices, etc.; the existing mixing devices for preparing brominated flame retardants still have the following defects during use: When brominated flame retardant production raw materials are stored, they are prone to agglomeration due to high temperature, high humidity and long-term light exposure. When mixing brominated flame retardant production raw materials containing agglomerates, the internal brominated flame retardant production raw materials cannot be mixed with the external brominated flame retardant production raw materials due to the formation of small lumps, resulting in insufficient mixing of the mixed brominated flame retardant production raw materials, resulting in uneven distribution of the flame retardant in the material, which in turn affects the flame retardant properties of the material. Moreover, if the agglomerates are not fully dispersed, the local flame retardant concentration may be too high, which may not only waste the flame retardant, but also have a negative impact on the physical properties of the material and reduce the toughness or strength of the material. In addition, in order to ensure that the agglomerates are fully dispersed, the mixing time may need to be extended, which will not only reduce production efficiency, but also increase energy consumption. Due to the uneven distribution of the flame retardant, the flame retardant properties of the product may be unstable. In some areas, there may be too much or too little flame retardant, resulting in the flame retardant properties of the product failing to meet the design requirements. Moreover, in the existing mixing equipment for the production of brominated flame retardants, a structure is also designed to break up the agglomerated raw materials, but the raw materials are only broken once, and the breaking effect is not ideal. Agglomerated raw materials still exist in the broken raw materials. These raw materials that are not fully broken still affect the mixing during the production of brominated flame retardants. Summary of the invention

[0004] In view of the problem in the prior art that during the production and mixing of brominated flame retardants, there are agglomerated raw materials in the raw materials of the brominated flame retardants, which leads to insufficient mixing of the raw materials after mixing, resulting in uneven distribution of the flame retardant in the material, and affecting the flame retardant properties of the material, a method and a preparation device for a brominated flame retardant are proposed.

[0005] The present application provides a method for preparing a brominated flame retardant, comprising the following steps: S1. Raw material preparation: add bromine and anhydrous AlBr3 into a mixing box in sequence; S2, cooling and reaction: cool to 0-3°C with ice brine, slowly add xylene under stirring; S3, post-treatment: After the block disappears, cool to 10-15°C, continue to add the remaining xylene, react at 20°C for 4-6 hours, and after the reaction is completed, evaporate the excess bromine, and put the reaction solution into a centrifuge for filtration and drying; S4. Purification: recrystallization with methanol.

[0006] Furthermore, in S2, when lumps appear in the mixing box or the viscosity is too high, bromine is added for dilution, and the temperature is controlled at 30-35°C during the dilution process.

[0007] The present application also provides a brominated flame retardant preparation device, the purpose of which is to solve the problem that during the existing production and mixing of brominated flame retardants, there are agglomerated raw materials, resulting in insufficient mixing of the mixed raw materials, and the existing agglomerated raw materials are only broken once, the breaking effect is not ideal, and the production and mixing of the flame retardant are still affected.

[0008] The technical solution of the present invention is: a brominated flame retardant preparation device, comprising a mixing box, a feed bin arranged at the top of the mixing box, and a discharge pipe arranged at the bottom of the mixing box, and also comprising a mixing unit arranged in the mixing box; The mixing unit comprises a screening component arranged at the top of the inner side of the mixing box, and a stirring component arranged at the bottom of the inner side of the mixing box, and the screening component comprises a screening assembly arranged in the mixing box, a material discharge assembly arranged on the screening assembly, and a transmission assembly arranged at the rear side of the screening assembly; The screening assembly includes a screening cylinder fixedly connected to the mixing box, a circular ring rotatably connected to one end of the screening cylinder, a gear ring rotatably connected to the other end of the screening cylinder, a plurality of C-shaped plates distributed in a ring array fixedly connected between the circular ring and the gear ring, the C-shaped plates are in contact with the inner wall of the screening cylinder away from the circular ring, a first connecting shaft rotatably connected to the rear side of the mixing box, one end of the first connecting shaft passes through the screening cylinder and extends to the inner side of the screening cylinder, a first gear fixedly connected to the first connecting shaft, and the first gear is meshed with the gear ring.

[0009] Furthermore, the blanking assembly includes a blanking plate rotatably connected to the C-shaped plate, symmetrically distributed movable cavities opened at both ends of the blanking plate, a rotating rod rotatably connected to the inner side of the movable cavity, a torsion spring fixedly connected between the rotating rod and the inner wall of the movable cavity, and the torsion spring is sleeved on the outside of the rotating rod.

[0010] Furthermore, the transmission assembly includes a sleeve rotatably connected to the rear side of the mixing box, a second connecting shaft limitedly slidably connected to the inner side of the sleeve, a second gear fixedly mounted on the second connecting shaft at one end close to the sleeve, a third gear fixedly mounted on the second connecting shaft at one end away from the sleeve, a fourth gear fixedly mounted on the first connecting shaft at one end close to the mixing box, and a fifth gear fixedly mounted on the first connecting shaft at one end away from the mixing box, the third gear is meshingly connected to the fifth gear, and the second gear is meshingly connected to the fourth gear.

[0011] Furthermore, the screening component also includes a limit assembly arranged on the transmission assembly, a drive assembly arranged on the rear side of the transmission assembly, and a crushing assembly arranged in the screening cylinder; The limit assembly includes a return spring fixedly connected between the second connecting shaft and the sleeve, a sliding groove arranged inside the sleeve, a sliding block slidably connected inside the sliding groove, and the sliding block is fixedly connected to the second connecting shaft.

[0012] Furthermore, the drive assembly includes a round block fixedly connected to the end of the second connecting shaft away from the sleeve, two symmetrically distributed V-shaped grooves opened on the round block, a V-shaped block movably inserted into the inner sides of the two V-shaped grooves, a disc fixedly connected between the two V-shaped blocks, a first drive motor fixedly connected to the rear side of the mixing box, and the output shaft of the first drive motor is fixedly connected to the disc.

[0013] Furthermore, the crushing assembly includes two crushing rollers symmetrically distributed and rotatably connected in the screening drum, the two crushing rollers are meshedly connected to each other, fixed shafts respectively fixedly connected to the front ends of the two crushing rollers, sixth gears respectively fixedly mounted on the two fixed shafts, the two sixth gears are meshedly connected to each other, a third connecting shaft fixedly connected to the rear end of one of the crushing rollers, pulleys respectively fixedly mounted on the first connecting shaft and the third connecting shaft, and a belt mounted between the two pulleys.

[0014] Furthermore, the stirring component includes a stirring assembly arranged in the mixing box, and a pushing assembly arranged on the stirring assembly; The stirring assembly comprises a sliding block slidably connected in the mixing box, a stirring shaft rotatably connected to the bottom of the sliding block, and a plurality of stirring blades rotatably connected to the stirring shaft and evenly distributed.

[0015] Furthermore, the pushing assembly includes a smooth rod fixedly connected to the mixing box, a reciprocating screw rotatably connected to the mixing box at the bottom of the smooth rod, a sliding block threadedly connected to the outside of the reciprocating screw, the sliding block slidably connected to the outside of the smooth rod, a second drive motor fixedly connected to one side of the mixing box, the output shaft of the second drive motor fixedly connected to one end of the reciprocating screw, a frame fixedly connected to the mixing box, two first racks symmetrically distributed fixedly connected to one side of the frame, a second rack fixedly connected to the other side of the frame, and a seventh gear fixedly mounted on the stirring shaft, the seventh gear being meshed with the first rack and the second rack, respectively.

[0016] Beneficial effects of the present invention: The raw materials are screened by the screening component so that smaller raw materials fall to the bottom of the mixing box for full mixing, while larger agglomerated raw materials remain in the screening component and are then broken up into smaller particles which fall down from the screening component. This cycle allows the agglomerated raw materials to be fully broken up so that the raw materials can be fully mixed together, thus avoiding the presence of agglomerated raw materials in the raw materials, resulting in inadequate mixing of the raw materials, affecting the mixing efficiency of the raw materials, and possibly affecting the flame retardant properties of the products.

[0017] The torque required by the C-type plate becomes larger, which makes the torque required by the first connecting shaft larger, so that the second connecting shaft extends into the sleeve, driving the second gear and the third gear to move, so that the third gear is separated from the fifth gear, and the second gear is meshed with the fourth gear. The radius of the second gear is larger than the radius of the fourth gear, so the speed of rotation of the fourth gear is faster than the speed of rotation of the second gear, so that the speed of rotation of the first connecting shaft is faster than the speed of rotation of the second connecting shaft, thereby making the C-type plate rotate faster, and the raw materials in the screening cylinder are screened faster, thereby improving the screening efficiency of the raw materials and thereby improving the mixing efficiency of the raw materials.

[0018] The reciprocating screw is driven to rotate by the second driving motor, and under the action of the light rod, the sliding block slides on the outside of the reciprocating screw, driving the stirring shaft to move, and driving the seventh gear to move. Under the action of the first rack and the second rack, the seventh gear rotates while moving, and the rotation directions are opposite, thereby driving the stirring shaft to move and rotate, and the rotation directions are opposite, so that the stirring shaft rotates clockwise and counterclockwise, so that the raw materials can be fully mixed, thereby increasing the mixing effect of the raw materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The schematic diagram of the process structure of the method for preparing the brominated flame retardant of the present invention; Figure 2 It is a front perspective structural schematic diagram of the brominated flame retardant preparation device of the present invention; Figure 3It is a rear perspective structural schematic diagram of the brominated flame retardant preparation device of the present invention; Figure 4 This is a schematic diagram of the structure of a mixing unit of a brominated flame retardant preparation device of the present invention; Figure 5 It is a schematic diagram of the partial structure of a mixing unit of the brominated flame retardant preparation device of the present invention; Figure 6 This is a schematic diagram of the structure of the screening component of the brominated flame retardant preparation device of the present invention; Figure 7 This is a schematic diagram of the structure of the unloading component of the brominated flame retardant preparation device of the present invention; Figure 8 This is a schematic diagram of the transmission component structure of the brominated flame retardant preparation device of the present invention; Fig. 9 This is a schematic diagram of the structure of the limiting component of the brominated flame retardant preparation device of the present invention; Fig.10 This is a schematic diagram of the structure of the driving assembly of the brominated flame retardant preparation device of the present invention; Fig.11 This is a schematic diagram of the structure of the crushing components of the brominated flame retardant preparation device of the present invention; Fig.12 This is an exploded view of the stirring component of the brominated flame retardant preparation device of the present invention.

[0020] In the figure: 1. Mixing box; 11. Feed bin; 12. Discharge pipe; 2. Screening assembly; 21. Ring; 22. Gear ring; 23. C-type plate; 24. First gear; 25. First connecting shaft; 26. Screening cylinder; 3. Unloading assembly; 31. Unloading plate; 32. Active cavity; 33. Torsion spring; 34. Rotating rod; 4. Transmission assembly; 41. Sleeve; 42. Second connecting shaft; 43. Second gear; 44. Third gear; 45. Fourth gear; 46. Fifth gear; 5. Limiting assembly; 51. Return spring; 52. Slide; 5 3. Slider; 6. Driving assembly; 61. Round block; 62. V-shaped groove; 63. V-shaped block; 64. Disc; 65. First driving motor; 7. Crushing assembly; 71. Crushing roller; 72. Third connecting shaft; 73. Pulley; 74. Belt; 75. Sixth gear; 8. Stirring assembly; 81. Stirring shaft; 82. Stirring blade; 83. Sliding block; 9. Pushing assembly; 91. Frame; 92. Seventh gear; 93. First rack; 94. Second rack; 95. Reciprocating screw; 96. Second driving motor; 97. Light rod. DETAILED DESCRIPTION

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0022] Example 1, reference Figure 1 , as the first embodiment of the present invention, provides a method for preparing a brominated flame retardant, comprising the following steps: S1, raw material preparation: add bromine and anhydrous AlBr3 into mixing box 1 in sequence; S2, cooling and reaction: cool to 0 or 3°C with ice brine, slowly add xylene under stirring; S3, post-treatment: After the block disappears, cool to 10 or 15°C, continue to add the remaining xylene, react at 20°C for 4 or 6 hours, after the reaction is completed, evaporate the excess bromine, put the reaction solution into a centrifuge for filtration and drying; S4. Purification: recrystallization with methanol.

[0023] Specifically, the raw materials for producing the brominated flame retardant are mixed by a mixing box 1, the agglomerated raw materials in the raw materials for producing the brominated flame retardant are screened out by a screening component 2, the screened agglomerated raw materials are crushed, and then the raw materials for producing the brominated flame retardant are stirred and mixed.

[0024] Reference Figure 1-Figure 4 In S2, when lumps appear in the mixing box 1 or the viscosity is too high, bromine is added for dilution, and the temperature is controlled at 30 or 35°C during the dilution process.

[0025] Specifically, the screening intensity of the screening component 2 can be changed through the transmission component 4, thereby improving the screening efficiency and the mixing efficiency.

[0026] Example 2, reference Figure 1-Figure 6 , which is the second embodiment of the present invention, provides a brominated flame retardant preparation device, including a mixing box 1, a feed bin 11 installed on the top of the mixing box 1, and a discharge pipe 12 installed at the bottom of the mixing box 1, and also includes a mixing unit installed in the mixing box 1; the mixing unit includes a screening component installed on the top of the inner side of the mixing box 1, and a stirring component installed at the bottom of the inner side of the mixing box 1, the screening component includes a screening component 2 installed in the mixing box 1, a feeding component 3 installed on the screening component 2, and a transmission component 4 installed at the rear side of the screening component 2; the screening component 2 includes a fixed A screening cylinder 26 connected to the mixing box 1, a circular ring 21 rotatably connected to one end of the screening cylinder 26, a toothed ring 22 rotatably connected to the other end of the screening cylinder 26, a plurality of C-shaped plates 23 distributed in a ring array and fixedly connected between the circular ring 21 and the toothed ring 22, the C-shaped plates 23 being in contact with the inner wall of the screening cylinder 26 away from the circular ring 21, a first connecting shaft 25 rotatably connected to the rear side of the mixing box 1, one end of the first connecting shaft 25 passes through the screening cylinder 26 and extends to the inner side of the screening cylinder 26, a first gear 24 fixedly connected to the first connecting shaft 25, and the first gear 24 is meshed with the toothed ring 22.

[0027] Specifically, when in use, the mixed raw material for preparing the brominated flame retardant is put into the feed bin 11, and enters the mixing box 1 through the feed bin 11. The raw materials are screened through the screening component, so that the smaller raw materials fall into the bottom of the mixing box 1 and are fully mixed. The larger agglomerated raw materials stay in the screening component and then are broken up, so that the agglomerated raw materials are broken into smaller particles and fall from the screening component. In this cycle, the agglomerated raw materials are fully broken up, so that the raw materials can be fully mixed together, thereby avoiding the agglomerated raw materials. The raw materials are not mixed sufficiently, which affects the mixing efficiency of the raw materials and may also affect the flame retardant performance of the product. The first connecting shaft 25 rotates, driving the first gear 24 to rotate, driving the gear ring 22 to rotate, and driving the C-type plate 23 to rotate, so that the raw materials are screened in the screening cylinder 26. As the C-type plate 23 rotates, the raw materials in the screening cylinder 26 gradually fall from the screening cylinder 26, so that the raw materials in the mixing box 1 can be fully mixed, avoiding the influence of the agglomerated raw materials on the mixing, and the mixed raw materials are discharged from the discharge pipe 12.

[0028] Reference Figure 7 The blanking assembly 3 includes a blanking plate 31 rotatably connected to the C-shaped plate 23, movable cavities 32 symmetrically distributed at both ends of the blanking plate 31, a rotating rod 34 rotatably connected to the inner side of the movable cavity 32, and a torsion spring 33 fixedly connected between the rotating rod 34 and the inner wall of the movable cavity 32, and the torsion spring 33 is sleeved on the outer side of the rotating rod 34.

[0029] Specifically, when the C-shaped plate 23 rotates, the agglomerated raw materials are shoveled into the C-shaped plate 23, driving the raw materials to rotate. When the C-shaped plate 23 rotates to an inclined angle, the agglomerated raw materials in the C-shaped plate 23 will slide down from the C-shaped plate 23. Under the action of the unloading plate 31, the agglomerated raw materials in the C-shaped plate 23 are blocked to prevent the agglomerated raw materials in the C-shaped plate 23 from sliding down from the C-shaped plate 23 when the inclination angle of the C-shaped plate 23 is not large enough, which can play a buffering role for the raw materials in the C-shaped plate 23. When the inclination angle of the mold plate 23 is large enough, the gravity of the agglomerated raw materials squeezes the discharge plate 31, and the rotation rod 34 causes the discharge plate 31 to rotate on the C-shaped plate 23, causing the torsion spring 33 to twist. At this time, the agglomerated raw materials in the C-shaped plate 23 will slide down from the C-shaped plate 23, and then the torsion spring 33 will return to its original state, driving the rotation rod 34 to rotate, driving the discharge plate 31 to rotate, and sealing one end of the C-shaped plate 23, preparing for the next time the C-shaped plate 23 will shovel the raw materials in.

[0030] Reference Figure 8The transmission assembly 4 includes a sleeve 41 rotatably connected to the rear side of the mixing box 1, a second connecting shaft 42 limitedly slidably connected to the inner side of the sleeve 41, a second gear 43 fixedly sleeved on the end of the second connecting shaft 42 close to the sleeve 41, a third gear 44 fixedly sleeved on the end of the second connecting shaft 42 away from the sleeve 41, a fourth gear 45 fixedly sleeved on the end of the first connecting shaft 25 close to the mixing box 1, and a fifth gear 46 fixedly sleeved on the end of the first connecting shaft 25 away from the mixing box 1. The third gear 44 is meshingly connected with the fifth gear 46, and the second gear 43 is meshingly connected with the fourth gear 45.

[0031] Specifically, the second connecting shaft 42 rotates, driving the sleeve 41 to rotate, driving the third gear 44 to rotate, driving the fifth gear 46 to rotate, driving the first connecting shaft 25 to rotate, driving the C-type plate 23 to rotate, and screening the raw materials for the production of brominated flame retardants in the screening cylinder 26. When there are too many raw materials in the screening cylinder 26, the C-type plate 23 shovels in too much raw materials. When the C-type plate 23 rotates, the required torque is greater, making the torque required for the first connecting shaft 25 greater, making the torque required for the second connecting shaft 42 to rotate greater, so that the second connecting shaft 42 extends into the sleeve 41. The second gear 43 and the third gear 44 are driven to move, so that the third gear 44 is separated from the fifth gear 46, and the second gear 43 is meshed with the fourth gear 45. The radius of the second gear 43 is larger than that of the fourth gear 45, so the fourth gear 45 rotates faster than the second gear 43, so that the first connecting shaft 25 rotates faster than the second connecting shaft 42, thereby making the C-shaped plate 23 rotate faster, and the raw materials in the screening cylinder 26 are screened faster, thereby improving the screening efficiency of the raw materials, and then improving the mixing efficiency of the raw materials.

[0032] Example 3, reference Figure 9-11 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the screening component also includes a limiting assembly 5 installed on the transmission assembly 4, a driving assembly 6 installed on the rear side of the transmission assembly 4, and a crushing assembly 7 installed in the screening cylinder 26; the limiting assembly 5 includes a return spring 51 fixedly connected between the second connecting shaft 42 and the sleeve 41, a slide groove 52 opened on the inner side of the sleeve 41, and a slider 53 slidably connected to the inner side of the slide groove 52, and the slider 53 is fixedly connected to the second connecting shaft 42.

[0033] Specifically, when the torque required by the second connecting shaft 42 is larger, the second connecting shaft 42 will move toward the inside of the sleeve 41, so that the slider 53 slides inside the slide groove 52, squeezing the reset spring 51. When the torque required by the second connecting shaft 42 becomes smaller, the reset spring 51 will reset, so that the second connecting shaft 42 moves toward the outside of the sleeve 41. When the second connecting shaft 42 rotates, the sleeve 41 is driven to rotate with the cooperation of the slider 53 and the slide groove 52.

[0034] Reference Fig.10 The driving assembly 6 includes a round block 61 fixedly connected to the end of the second connecting shaft 42 away from the sleeve 41, two V-shaped grooves 62 symmetrically distributed on the round block 61, a V-shaped block 63 movably inserted into the inner sides of the two V-shaped grooves 62, a disc 64 fixedly connected between the two V-shaped blocks 63, and a first driving motor 65 fixedly connected to the rear side of the mixing box 1. The output shaft of the first driving motor 65 is fixedly connected to the disc 64.

[0035] Specifically, the first drive motor 65 drives the disc 64 to rotate, and with the cooperation of the V-block 63 and the V-groove 62, drives the round block 61 to rotate, and drives the second connecting shaft 42 to rotate. When the torque required for the second connecting shaft 42 to rotate is greater, the torque output by the first drive motor 65 is greater, driving the disc 64 to rotate faster, so that the V-block 63 slides in the V-groove 62, drives the round block 61 to move, drives the second connecting shaft 42 to move, and causes the third gear 44 and the fifth gear 46 to be misaligned, and the second gear 43 and the fourth gear 45 to mesh.

[0036] Reference Fig.11 The crushing assembly 7 includes two crushing rollers 71 symmetrically distributed and rotatably connected in the screening drum 26, the two crushing rollers 71 are meshed with each other, fixed shafts respectively fixedly connected to the front ends of the two crushing rollers 71, sixth gears 75 respectively fixedly sleeved on the two fixed shafts, the two sixth gears 75 are meshed with each other, a third connecting shaft 72 fixedly connected to the rear end of one of the crushing rollers 71, pulleys 73 respectively fixedly sleeved on the first connecting shaft 25 and the third connecting shaft 72, and a belt 74 sleeved between the two pulleys 73.

[0037] Specifically, the first connecting shaft 25 rotates, driving one of the pulleys 73 to rotate, and through the belt 74, driving another pulley 73 to rotate, driving the third connecting shaft 72 to rotate, driving one of the crushing rollers 71 to rotate, driving one of the fixed shafts to rotate, driving one of the sixth gears 75 to rotate, driving another sixth gear 75 to rotate in the opposite direction, and driving another crushing roller 71 to rotate in the opposite direction, so that the two crushing rollers 71 rotate in opposite directions, and the agglomerated raw materials are crushed. The rest of the structure is the same as that of Example 2.

[0038] Example 4, reference Fig.12 , which is the fourth embodiment of the present invention. This embodiment is different from the third embodiment in that: the stirring component includes a stirring assembly 8 arranged in the mixing box 1, and a pushing assembly 9 arranged on the stirring assembly 8; the stirring assembly 8 includes a sliding block 83 slidably connected in the mixing box 1, a stirring shaft 81 rotatably connected to the bottom of the sliding block 83, and a plurality of stirring blades 82 rotatably connected to the stirring shaft 81 and evenly distributed.

[0039] Specifically, the stirring shaft 81 rotates to drive the stirring blades 82 to rotate, thereby stirring the raw materials falling on the bottom of the mixing box 1. The sliding block 83 moves in the mixing box 1 to drive the stirring shaft 81 to move, thereby stirring the raw materials at different positions in the mixing box 1.

[0040] Reference Fig.12 The pushing assembly 9 includes a polished rod 97 fixedly connected to the mixing box 1, a reciprocating screw rod 95 rotatably connected to the mixing box 1 at the bottom of the polished rod 97, a sliding block 83 threadedly connected to the outside of the reciprocating screw rod 95, the sliding block 83 is slidably connected to the outside of the polished rod 97, a second drive motor 96 fixedly connected to one side of the mixing box 1, the output shaft of the second drive motor 96 is fixedly connected to one end of the reciprocating screw rod 95, a frame 91 fixedly connected to the mixing box 1, two first racks 93 symmetrically distributed fixedly connected to one side of the frame 91, a second rack 94 fixedly connected to the other side of the frame 91, and a seventh gear 92 fixedly sleeved on the stirring shaft 81, and the seventh gear 92 is meshed with the first rack 93 and the second rack 94 respectively.

[0041] Specifically, the second drive motor 96 is started, driving the reciprocating screw 95 to rotate. Under the action of the light rod 97, the sliding block 83 slides outside the reciprocating screw 95, driving the stirring shaft 81 to move, driving the seventh gear 92 to move, and under the action of the first rack 93 and the second rack 94, the seventh gear 92 rotates while moving, and the rotation direction is opposite, thereby driving the stirring shaft 81 to move and rotate, and the rotation direction is opposite, so that the stirring shaft 81 rotates clockwise and counterclockwise, so that the raw materials can be fully mixed. The rest of the structure is the same as that of Example 3. Based on Examples 2-4, the working principle of the present invention is as follows: when in use, the raw materials for preparing the brominated flame retardant are put into the feed bin 11, and the raw materials are screened in the screening cylinder 26 by the rotation of the C-type plate 23. The screened agglomerated raw materials are crushed by two crushing rollers 71 so that the raw materials can be fully mixed. When the raw materials in the screening cylinder 26 increase, the torque required for the rotation of the C-type plate 23 is greater, which makes the torque required for the rotation of the first connecting shaft 25 greater, so that when the second connecting shaft 42 rotates, the torque required is greater, so that the second connecting shaft 42 extends into the sleeve 41, squeezes the reset spring 51, and drives the second The gear 43 and the third gear 44 move, so that the third gear 44 is separated from the fifth gear 46, so that the second gear 43 is meshed with the fourth gear 45. The radius of the second gear 43 is larger than the radius of the fourth gear 45, so the fourth gear 45 rotates faster than the second gear 43, so that the first connecting shaft 25 rotates faster than the second connecting shaft 42, and thus the C-type plate 23 rotates faster, and the raw materials in the screening cylinder 26 are screened faster, not only the agglomerated raw materials are broken, but also the agglomerated raw materials can be screened, so that the agglomerated raw materials are circulated and broken, and the raw materials are mixed more fully.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for preparing a brominated flame retardant, characterized in that: The following steps are involved: S1. Raw material preparation: Bromine and anhydrous AlBr3 are added into a mixing box (1) in sequence; S2, cooling and reaction: cool to 0-3°C with ice brine, slowly add xylene under stirring; S3, post-treatment: After the block disappears, cool to 10-15°C, continue to add the remaining xylene, react at 20°C for 4-6 hours, and after the reaction is completed, evaporate the excess bromine, and put the reaction solution into a centrifuge for filtration and drying; S4. Purification: recrystallization with methanol.

2. The method for preparing a brominated flame retardant according to claim 1, wherein: In S2, when lumps appear in the mixing box (1) or the viscosity is too high, bromine is added for dilution, and the temperature is controlled at 30-35°C during the dilution process.

3. A brominated flame retardant preparation device, applied to the brominated flame retardant preparation method according to claim 1, characterized in that: It comprises a mixing box (1), a material feeding bin (11) arranged at the top of the mixing box (1), and a material discharge pipe (12) arranged at the bottom of the mixing box (1), and also comprises a mixing unit arranged in the mixing box (1); The mixing unit comprises a screening component arranged at the top of the inner side of the mixing box (1), and a stirring component arranged at the bottom of the inner side of the mixing box (1), the screening component comprises a screening component (2) arranged in the mixing box (1), a material discharge component (3) arranged on the screening component (2), and a transmission component (4) arranged at the rear side of the screening component (2); The screening assembly (2) comprises a screening cylinder (26) fixedly connected to the mixing box (1), a circular ring (21) rotatably connected to one end of the screening cylinder (26), a toothed ring (22) rotatably connected to the other end of the screening cylinder (26), a plurality of C-shaped plates (23) distributed in a ring array and fixedly connected between the circular ring (21) and the toothed ring (22), the C-shaped plates (23) being in contact with the inner wall of the screening cylinder (26) at a side away from the circular ring (21), a first connecting shaft (25) rotatably connected to the rear side of the mixing box (1), one end of the first connecting shaft (25) passing through the screening cylinder (26) and extending to the inner side of the screening cylinder (26), and a first gear (24) fixedly connected to the first connecting shaft (25), the first gear (24) being meshingly connected to the inner side of the toothed ring (22).

4. The brominated flame retardant preparation device according to claim 3, characterized in that: The blanking assembly (3) comprises a blanking plate (31) rotatably connected to the C-shaped plate (23), symmetrically distributed movable chambers (32) opened at both ends of the blanking plate (31), a rotating rod (34) rotatably connected to the inner side of the movable chamber (32), and a torsion spring (33) fixedly connected between the rotating rod (34) and the inner wall of the movable chamber (32), wherein the torsion spring (33) is sleeved on the outer side of the rotating rod (34).

5. The device for preparing brominated flame retardant according to claim 3, characterized in that: The transmission assembly (4) comprises a sleeve (41) rotatably connected to the rear side of the mixing box (1), a second connecting shaft (42) limitedly slidably connected to the inner side of the sleeve (41), a second gear (43) fixedly sleeved on an end of the second connecting shaft (42) close to the sleeve (41), a third gear (44) fixedly sleeved on an end of the second connecting shaft (42) away from the sleeve (41), a fourth gear (45) fixedly sleeved on an end of the first connecting shaft (25) close to the mixing box (1), and a fifth gear (46) fixedly sleeved on an end of the first connecting shaft (25) away from the mixing box (1), the third gear (44) being meshingly connected to the fifth gear (46), and the second gear (43) being meshingly connected to the fourth gear (45).

6. The device for preparing brominated flame retardant according to claim 5, characterized in that: The screening component further comprises a limit assembly (5) arranged on the transmission assembly (4), a drive assembly (6) arranged on the rear side of the transmission assembly (4), and a crushing assembly (7) arranged in the screening cylinder (26); The limit assembly (5) comprises a return spring (51) fixedly connected between the second connecting shaft (42) and the sleeve (41), a slide groove (52) provided inside the sleeve (41), and a slider (53) slidably connected inside the slide groove (52); the slider (53) is fixedly connected to the second connecting shaft (42).

7. The device for preparing brominated flame retardant according to claim 6, characterized in that: The driving assembly (6) comprises a round block (61) fixedly connected to an end of the second connecting shaft (42) away from the sleeve (41), two V-shaped grooves (62) symmetrically arranged on the round block (61), a V-shaped block (63) movably inserted into the inner sides of the two V-shaped grooves (62), a disc (64) fixedly connected between the two V-shaped blocks (63), and a first driving motor (65) fixedly connected to the rear side of the mixing box (1); the output shaft of the first driving motor (65) is fixedly connected to the disc (64).

8. The device for preparing brominated flame retardant according to claim 6, characterized in that: The crushing assembly (7) comprises two crushing rollers (71) symmetrically distributed and rotatably connected in a screening drum (26), the two crushing rollers (71) meshingly connected to each other, fixed shafts respectively fixedly connected to the front ends of the two crushing rollers (71), sixth gears (75) respectively fixedly sleeved on the two fixed shafts, the two sixth gears (75) meshingly connected to each other, a third connecting shaft (72) fixedly connected to the rear end of one of the crushing rollers (71), pulleys (73) respectively fixedly sleeved on the first connecting shaft (25) and the third connecting shaft (72), and a belt (74) sleeved between the two pulleys (73).

9. The device for preparing brominated flame retardant according to claim 3, characterized in that: The stirring component comprises a stirring assembly (8) arranged in the mixing box (1), and a pushing assembly (9) arranged on the stirring assembly (8); The stirring assembly (8) comprises a sliding block (83) slidably connected in the mixing box (1), a stirring shaft (81) rotatably connected to the bottom of the sliding block (83), and a plurality of stirring blades (82) evenly distributed and rotatably connected to the stirring shaft (81).

10. The device for preparing brominated flame retardant according to claim 9, characterized in that: The pushing assembly (9) comprises a polished rod (97) fixedly connected to the mixing box (1), a reciprocating screw rod (95) rotatably connected to the mixing box (1) and located at the bottom of the polished rod (97), a sliding block (83) threadedly connected to the outside of the reciprocating screw rod (95), the sliding block (83) being slidably connected to the outside of the polished rod (97), a second driving motor (96) fixedly connected to one side of the mixing box (1), an output shaft of the second driving motor (96) being fixedly connected to one end of the reciprocating screw rod (95), a frame (91) fixedly connected to the mixing box (1), two first racks (93) symmetrically distributed fixedly connected to one side of the frame (91), a second rack (94) fixedly connected to the other side of the frame (91), and a seventh gear (92) fixedly sleeved on the stirring shaft (81), the seventh gear (92) being meshedly connected to the first rack (93) and the second rack (94) respectively.

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