Synthesis method of melamine formaldehyde resin based on recycled raw materials

Abstract

The present invention provides a melamine formaldehyde resin synthesis method based on recycled raw materials, S1, recycled raw materials purification treatment; S1.1, melamine purification; S1.2, formaldehyde purification; S2, melamine and formaldehyde mixing; S2.1, preliminary preheating; S2.2, prepolymerization mixing; S2.3, gathering and degassing; the mixing device conveys the coacervate to concentrate, and before the prepolymer is completely concentrated, the prepolymer is mixed and heated to 120°C to 180°C to obtain melamine formaldehyde resin, cut to the inside of the melamine formaldehyde resin, release the internal gas, gather the melamine formaldehyde resin to the end of the mixing device; S3, extrude and discharge. In the present invention, when mixing and producing melamine formaldehyde resin, gas is generated inside. When the melamine formaldehyde resin is mixed and conveyed inside the mixing device, the gas generated inside the melamine formaldehyde resin is released at the same time, and finally the material is extruded to ensure the internal density of the melamine formaldehyde resin, thereby ensuring the quality of the produced melamine formaldehyde resin.

Description

Technical Field

[0001] The invention relates to the technical field of melamine formaldehyde resin processing, and in particular to a melamine formaldehyde resin synthesis method based on recycled raw materials. Background Art

[0002] Melamine formaldehyde resin, commonly known as MF resin, is a polymer compound formed by the polycondensation of melamine and formaldehyde under alkaline conditions. This resin exhibits excellent thermal stability, mechanical strength, and chemical resistance, making it widely used in a variety of fields. In the plastics industry, it is often used as a building block for molding materials, coatings, and adhesives. In the textile industry, melamine formaldehyde resin is added to textiles to improve their heat resistance and fire resistance. It is also used in the manufacture of composite materials, electronic component packaging materials, and everyday items such as tableware and tabletops. Due to its outstanding physical and chemical properties, melamine formaldehyde resin holds a vital position in modern industry.

[0003] Currently, in the synthesis and production of melamine-formaldehyde resin, melamine and formaldehyde are introduced into a stirred reactor, mixed and heated, and an alkaline solution is added during the mixing process. A large amount of gas is then generated during the mixing process, and an exhaust structure is used to discharge the generated gas. Finally, the melamine-formaldehyde resin synthesized by the mixed condensation is discharged. However, although this melamine-formaldehyde resin removes the gas generated externally, some of the gas is mixed into the melamine-formaldehyde resin during mixing, resulting in a large amount of gas that affects the quality of the melamine-formaldehyde resin. Furthermore, during subsequent discharge, the gas is released and affects the surrounding environment.

[0004] In summary, there is a need for a synthesis method for producing high-quality melamine-formaldehyde resin. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the present invention provides a method for synthesizing melamine formaldehyde resin based on recycled raw materials, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] A method for synthesizing melamine formaldehyde resin based on recycled raw materials, the method comprising the following steps:

[0008] S1, recovery and purification of raw materials;

[0009] S1.1, melamine purification;

[0010] Dissolve the melamine recovery material in water, then add an appropriate amount of activated carbon for stirring and adsorption to remove color and other organic impurities. Remove the activated carbon particles through a filtration device, and evaporate and crystallize to obtain pure melamine crystals.

[0011] S1.2, formaldehyde purification;

[0012] The formaldehyde recovery material is distilled to remove most of the organic impurities and moisture, and further distilled to remove trace impurities to obtain pure paraformaldehyde;

[0013] S2, melamine and formaldehyde mixture;

[0014] S2.1, preliminary preheating;

[0015] The alkaline solution and the recovered melamine and paraformaldehyde are stored separately in a mixing device, the melamine and paraformaldehyde are taken in a molar ratio of 1:1.5 to 1:1.8, and the taken melamine and paraformaldehyde are preheated to 40 to 50°C;

[0016] S2.2, prepolymerization mixing;

[0017] The mixing equipment centrally stirs and mixes melamine and paraformaldehyde, and heats the mixture to 80-90°C. At the same time, an alkaline solution is added to adjust the pH value to 7-8 to promote the polycondensation reaction and obtain a prepolymer.

[0018] S2.3, gathering and degassing;

[0019] The mixing equipment transports the prepolymer to concentrate, and before the prepolymer is completely concentrated, the prepolymer is mixed and heated to 120°C to 180°C to obtain melamine formaldehyde resin, which is then cut into the interior of the melamine formaldehyde resin to release the internal gas and gather the melamine formaldehyde resin to the end of the mixing equipment;

[0020] S3, extrusion discharging;

[0021] The melamine formaldehyde resin is rolled at the end of the mixing equipment to output compact melamine formaldehyde resin.

[0022] Furthermore, the mixing equipment includes a bottom plate, two brackets are fixed on the top surface of the bottom plate, a protective box is fixed on the top surface of one bracket, one side of the protective box is connected to a discharge box, the discharge box is fixed to the top surface of the other bracket, a mixing component and a lifting and cutting component are arranged inside the protective box, one side of the mixing component and the lifting and cutting component are both connected to the inside of the discharge box, the lifting and cutting component is arranged on the top of the mixing component, the middle part of the lifting and cutting component is plugged into the inside of the mixing component, the bottom of the mixing component is connected to the heat conducting component, the bottom of the heat conducting component is arranged through the bottom surface of the protective box, a feeding component is arranged on the top surface of the protective box, the bottom of the feeding component is passed through the inside of the protective box, the bottom of the feeding component is connected to the inside of the mixing component, an air exchange component is arranged on the top surface of the protective box, the air inlet and air outlet of the air exchange component are both connected to the inside of the mixing component;

[0023] The mixing assembly includes a second motor, a first cam, a first rotating shaft, a screw, a second rotating shaft, a second cam, a mixing box and a discharge pipe, the mixing box is fixed inside the protective box, the bottom surface of the mixing box is an arc-shaped structure, the bottom surface of the mixing box is fitted with a heat-conducting assembly, one side of the mixing box is connected with a discharge pipe, one end of the discharge pipe is connected to the inside of the discharge box, the screw is connected to the mixing box and the discharge pipe, one end of the screw is connected to the first rotating shaft, the first rotating shaft is connected to the side of the discharge box away from the protection box, one end of the first rotating shaft is connected to the second motor, the outer wall of the first rotating shaft is sleeved with the first cam, the other end of the screw is connected to the second rotating shaft, the second rotating shaft is connected to the side wall of the protection box, the outer wall of the second rotating shaft is sleeved with the second cam, the bottom of one side of the lifting and cutting assembly is fitted with the first cam, and the bottom of the other side of the lifting and cutting assembly is fitted with the second cam, and the lifting and cutting assembly is pushed into the mixing box by the first cam and the second cam;

[0024] A protection box is fixed inside the blanking box, a first rotating shaft is rotatably connected to the inside of the protection box, a first cam is arranged inside the protection box, and two blanking rollers are rotatably connected to the inside of the protection box.

[0025] Furthermore, the lifting and cutting assembly includes a second lifting plate, a second elastic telescopic rod, a first rolling wheel, a third elastic telescopic rod and a second rolling wheel. The second lifting plate is connected with the second elastic telescopic rod and the third elastic telescopic rod. The bottom end of the second elastic telescopic rod is connected with the first rolling wheel. The first rolling wheel rolls and fits the top of the first cam. The bottom end of the third elastic telescopic rod is connected with the second rolling wheel. The second rolling wheel rolls and fits the top of the second cam. The outer tubes of the second elastic telescopic rod and the third elastic telescopic rod are fixed to the bottom surface of the second lifting plate, the internal plug rod of the second elastic telescopic rod is connected to the internal top surface of the unloading box, the internal plug rod of the third elastic telescopic rod is connected to the internal top surface of the protective box, and multiple cutting knives are fixed to the bottom surface of the second lifting plate, and the cutting knives are inserted into the mixing box.

[0026] Furthermore, a first partition is fixed inside the mixing box, a second partition is fixed on the bottom of the first partition, a third partition is fixed on the side of the second partition away from the first partition, the bottom of the third partition is a sloped structure, a plurality of cutting knives are inserted through the inside of the second partition, an electric wheel is provided on the top surface of the second partition, a plurality of pushing knives are fixed on the outer wall of the electric wheel, and the bottom of the electric wheel is provided through the bottom of the second partition.

[0027] Furthermore, the air exchange assembly includes an air pump, an air outlet pipe, a duct, a filter cover, a filter cartridge and an exhaust pipe. The air pump is arranged on the top surface of the protective box, and the air outlet on the bottom surface of the air pump is connected to the air outlet pipe. The air outlet pipe passes through and is connected to the interior of the mixing box. One end of the air outlet pipe passes through and is connected to the interior of the first partition. The outlet of one end of the air outlet pipe is arranged toward the cutting knife. The air inlet on the top surface of the air pump is connected to the duct, one end of the duct is connected to the filter cover, the bottom surface of the filter cover is connected to the filter cartridge, the bottom surface of the filter cartridge is connected to the exhaust pipe, and one end of the exhaust pipe is inserted into the side wall of the mixing box near the discharge pipe.

[0028] Furthermore, a fixed plate is fixed on the bottom surface of the second lifting plate, a push plate is fixed on the bottom surface of the fixed plate, the push plate is an L-shaped structure, a pressure scraper is fixed on the bottom surface of the push plate, and the bottom surface of the pressure scraper is an arc groove structure for fitting with the outer wall of the first rotating shaft.

[0029] Furthermore, the feeding assembly includes a first feeding tank, an alkali liquid tank, a second feeding tank and a sealing component. The bottom end of the first feeding tank is connected to a first feeding pipe, the bottom end of the alkali liquid tank is connected to a liquid adding pipe, and the bottom end of the second feeding tank is connected to a second feeding pipe. The first feeding pipe, the liquid adding pipe and the second feeding pipe are all connected to the interior of the mixing box. A temporary storage box is provided on the top surface of the mixing box. Two temporary storage boxes are provided in mirror image. The bottom ends of the first feeding pipe and the second feeding pipe are respectively provided inside the two temporary storage boxes. The sealing component is provided between the two temporary storage boxes. The temporary storage box is provided with a discharge port on one side close to the sealing component. The bottom end of the liquid adding pipe is closed and a liquid outlet hole is provided on the side wall of the bottom end. The bottom end of the liquid adding pipe is inserted into the sealing component. The sealing component is used to open and close the discharge port and the liquid outlet hole by lifting. The bottom surface of the temporary storage box is provided with an inclined heating plate.

[0030] Furthermore, the sealing component includes a pneumatic rod, a first lifting plate, a sealing cylinder and a side sealing plate. The pneumatic rod is arranged on the top surface of the protective box. The telescopic bottom end of the pneumatic rod is connected to the inside of the mixing box. The telescopic bottom end of the pneumatic rod is connected to the first lifting plate. Side sealing plates are fixed on both sides of the first lifting plate. The side sealing plates are fitted and sealed on the outside of the discharge port. A sealing cylinder is inserted into the inside of the first lifting plate, and the bottom end of the liquid adding tube is inserted into the inside of the sealing cylinder.

[0031] Furthermore, a fixing frame is fixed on the top surface of the second lifting plate, a first elastic telescopic rod is provided on the side wall of the fixing frame, the telescopic end of the first elastic telescopic rod is connected to a rolling vibration wheel, a vibration guide plate is fixed on the side wall of the first feeding tube, the side wall of the vibration guide plate is a wavy structure, and one side of the rolling vibration wheel is arranged to fit the wavy structure of the vibration guide plate.

[0032] Furthermore, the heat conduction assembly includes a first heating plate, an insulation block, a heat conduction plate, a second heating plate and a heat dissipation component. The first heating plate, the heat conduction plate and the second heating plate are all fitted on the outer wall of the bottom surface of the mixing box. The heat conduction plate is arranged between the first heating plate and the second heating plate. A heat insulation block is fixed between the first heating plate, the heat conduction plate and the second heating plate. The bottom surface of the heat conduction plate is connected to the heat dissipation component, and the heat dissipation component is arranged through the bottom surface of the protective box.

[0033] The heat dissipation component includes a heat dissipation box, a first motor, fan blades and heat dissipation strips. The heat dissipation box is fixed to the bottom surface of the protective box. Multiple heat dissipation strips are fixed to the side walls of the heat dissipation box. The heat dissipation strips pass through and are fixed to the bottom surface of the heat conduction plate. The first motor is arranged on the bottom surface of the heat dissipation box. The rotating top end of the first motor passes through the inside of the heat dissipation box. The rotating top end of the first motor is connected to the fan blades.

[0034] The present invention provides a method for synthesizing melamine formaldehyde resin based on recycled raw materials. Compared with the prior art, it has the following advantages:

[0035] 1. During the mixing and production of melamine formaldehyde resin, gas will be generated inside. When the melamine formaldehyde resin is mixed and transported inside the mixing equipment, the gas generated inside the melamine formaldehyde resin will be released at the same time. Finally, the material is extruded to ensure the internal density of the melamine formaldehyde resin, thereby ensuring the quality of the produced melamine formaldehyde resin;

[0036] 2. After the materials are conveyed into the mixing box, the screw is used to push the materials to move and mix them. The temperature of the material mixture is adjusted by the heat conduction component. When the screw rotates, the first cam and the second cam cooperate to push the lifting and cutting component to move up and down. During the reciprocating lifting and lowering process of the lifting and cutting component, the melamine formaldehyde resin mixed and conveyed in the mixing box is cut open, and the large bubbles inside are cut open to release the internal gas. The gas is then introduced into the discharge box through the discharge pipe, thereby ensuring the density and quality of the melamine formaldehyde resin inside.

[0037] 3. During the melamine formaldehyde resin conveying and mixing process, the generated gas and the gas released by internal cutting are extracted through the air exchange component, and the gas is filtered before being reintroduced, so as to achieve timely cleaning of the gas and ensure the production quality of melamine formaldehyde resin and the environmental friendliness of the production;

[0038] 4. When the melamine formaldehyde resin is introduced into the discharge box, two discharge rollers are used to further compress the melamine formaldehyde resin discharge to ensure the synthesis quality of the melamine formaldehyde resin. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 A flow chart of a method for synthesizing melamine formaldehyde resin based on recycled raw materials according to the present invention is shown;

[0041] Figure 2 Shows a schematic structural diagram of the mixing device of the present invention;

[0042] Figure 3 It shows a schematic diagram of the internal connection structure of the protection box and the blanking box of the present invention;

[0043] Figure 4 Shown Figure 3 A local enlarged structural diagram in FIG.

[0044] Figure 5 It shows a schematic diagram of the internal connection structure of the mixing box of the present invention;

[0045] Figure 6 Shown Figure 5 A schematic diagram of the local enlarged structure at point B in FIG.

[0046] Figure 7 A cross-sectional view of the connection structure between the feeding assembly and the mixing box of the present invention is shown;

[0047] Figure 8 Shown Figure 7 A schematic diagram of the partially enlarged structure at point C in FIG.

[0048] Figure 9 It shows a schematic diagram of the internal connection structure of the blanking box of the present invention;

[0049] As shown in the figure: 1. Base plate; 2. Bracket; 3. Protective box; 4. Feeding assembly; 41. First feeding tank; 411. First feeding pipe; 412. Vibration guide plate; 42. Alkali liquid tank; 421. Feeding pipe; 4211. Liquid outlet; 43. Second feeding tank; 431. Second feeding pipe; 44. Sealing component; 441. Pneumatic rod; 442. First lifting plate; 443. Sealing cylinder; 444. Side sealing plate; 5. Heat conduction assembly; 51. First heating plate; 52. Heat insulation block; 53. Heat conduction plate; 54. Second heating plate; 55. Heat dissipation component; 551. Heat dissipation box; 552. First motor; 553. Fan blade; 54. Heat dissipation strip; 6. Ventilation assembly; 61. Air pump; 62. Air outlet pipe; 63. Conduit; 64. Filter cover; 65. Filter cylinder; 66. Exhaust pipe; 7. Unloading Box; 71, protective box; 72, unloading roller; 8, mixing assembly; 81, second motor; 82, first cam; 83, first rotating shaft; 84, screw; 85, second rotating shaft; 86, second cam; 87, mixing box; 871, first partition; 872, second partition; 873, electric wheel; 8731, pusher; 874, third partition; 875, temporary storage box; 8751, inclined heating plate; 8752, discharge port; 88, discharge pipe; 9, lifting and cutting assembly; 91, second lifting plate; 911, cutting knife; 912, fixed frame; 913, first elastic telescopic rod; 914, rolling wheel; 915, fixed plate; 916, pusher plate; 917, scraper; 92, second elastic telescopic rod; 93, first rolling wheel; 94, third elastic telescopic rod; 95, second rolling wheel. DETAILED DESCRIPTION

[0050] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0051] Example 1

[0052] In order to solve the technical problems in the background technology, the following melamine formaldehyde resin synthesis method based on recycled raw materials is provided:

[0053] Combine Figures 1-9 As shown, the present invention provides a method for synthesizing melamine formaldehyde resin based on recycled raw materials, and the synthesis method comprises the following steps:

[0054] S1, recovery and purification of raw materials;

[0055] S1.1, melamine purification;

[0056] Dissolve the melamine recovery material in water, then add an appropriate amount of activated carbon for stirring and adsorption to remove color and other organic impurities. Remove the activated carbon particles through a filtration device, and evaporate and crystallize to obtain pure melamine crystals.

[0057] S1.2, formaldehyde purification;

[0058] The formaldehyde recovery material is distilled to remove most of the organic impurities and moisture, and further distilled to remove trace impurities to obtain pure paraformaldehyde;

[0059] S2, melamine and formaldehyde mixture;

[0060] S2.1, preliminary preheating;

[0061] The alkaline solution and the recovered melamine and paraformaldehyde are stored separately in a mixing device, the melamine and paraformaldehyde are taken in a molar ratio of 1:1.5 to 1:1.8, and the taken melamine and paraformaldehyde are preheated to 40 to 50°C;

[0062] Specifically, the above steps are as follows: the first feeding tank 41 adds paraformaldehyde to a temporary storage box 875, the second feeding tank 43 adds melamine to another temporary storage box 875, and the inclined heating plates 8751 inside the temporary storage boxes 875 are respectively activated to preheat the paraformaldehyde and melamine inside the temporary storage boxes 875. At the same time, the alkali solution tank 42 introduces the alkali solution into the bottom end of the liquid adding pipe 421;

[0063] The second motor 81 is started, and the first cam 82 on the first rotating shaft 83 pushes the second rolling wheel 95 to rise. The second cam 86 on the second rotating shaft 85 pushes the first rolling wheel 93 to rise. The second elastic telescopic rod 92 and the third elastic telescopic rod 94 are retracted and reset, so that the second lifting plate 91 is lifted and lowered reciprocatingly. The rolling wheel 914 is attached to the wavy side wall of the vibration guide plate 412 and rolls and vibrates, which promotes the extraction of paraformaldehyde and melamine, ensuring the accuracy of the material ratio.

[0064] S2.2, prepolymerization mixing;

[0065] The mixing equipment centrally stirs and mixes melamine and paraformaldehyde, and heats the mixture to 80-90°C. At the same time, an alkaline solution is added to adjust the pH value to 7-8 to promote the polycondensation reaction and obtain a prepolymer.

[0066] The above steps are specifically as follows: the first heating plate 51 is activated to transfer heat to the interior of the mixing box 87, and the interior of the mixing box 87 is heated to 80°C to 90°C. The pneumatic rod 441 is activated to pull the first lifting plate 442 upward, and the two side sealing plates 444 simultaneously open the discharge ports 8752 of the two temporary storage boxes 875. At the same time, the sealing cylinder 443 is raised to open the liquid outlet 4211 on the side wall of the bottom end of the liquid adding tube 421, and the alkaline solution is added. The melamine and paraformaldehyde are mixed and stirred by the screw 84 to obtain a prepolymer, and then transported to the discharge pipe 88.

[0067] S2.3, gathering and degassing;

[0068] The mixing equipment transports the prepolymer to concentrate, and before the prepolymer is completely concentrated, the prepolymer is mixed and heated to 120°C to 180°C to obtain melamine formaldehyde resin, which is then cut into the interior of the melamine formaldehyde resin to release the internal gas and gather the melamine formaldehyde resin to the end of the mixing equipment;

[0069] The above steps are specifically as follows: the second heating plate 54 is started to transfer heat to the interior of the mixing box 87, and the interior of the mixing box 87 is heated to 120° C. to 180° C. near the discharge pipe 88. The prepolymer is heated and synthesized into melamine formaldehyde resin while being transported through. The electric wheel 873 is started to drive the pusher 8731 to rotate. The pusher 8731 pushes the melamine formaldehyde resin to the bottom of the cutting knife 911. The second lifting plate 91 drives the cutting knife 911 to rise and fall back and forth, cutting the inside of the melamine formaldehyde resin to discharge the internal gas, and the air pump 61 is started to extract and filter the gas. The filtered gas with heat is then sent back to the interior of the mixing box, and the melamine formaldehyde resin with discharged gas is led to the interior of the discharge box 7.

[0070] S3, extrusion discharging;

[0071] The end of the mixing equipment rolls the melamine formaldehyde resin to derive compact melamine formaldehyde resin;

[0072] The above steps are specifically as follows: the second lifting plate 91 drives the pushing plate 916 connected to the fixed plate 915 to rise and fall back and forth, prompting the melamine formaldehyde resin to be pushed downward to between the two discharge rollers 72, and starting the discharge rollers 72 to further roll the melamine formaldehyde resin, so that the melamine formaldehyde resin is discharged from the bottom of the discharge box 7 in a more compact state.

[0073] According to the above structure, the following effects can be achieved:

[0074] When melamine formaldehyde resin is mixed and produced, gas will be generated inside. When the melamine formaldehyde resin is mixed and transported inside the mixing equipment, the gas generated inside the melamine formaldehyde resin will be released at the same time. Finally, the material is extruded to ensure the internal density of the melamine formaldehyde resin, thereby ensuring the quality of the produced melamine formaldehyde resin.

[0075] In this embodiment, the mixing equipment includes a bottom plate 1, two brackets 2 are fixed on the top surface of the bottom plate 1, a protection box 3 is fixed on the top surface of one bracket 2, one side of the protection box 3 is connected to a discharge box 7, the discharge box 7 is fixed to the top surface of the other bracket 2, a mixing component 8 and a lifting and cutting component 9 are arranged inside the protection box 3, one side of the mixing component 8 and the lifting and cutting component 9 are both connected to the inside of the discharge box 7, the lifting and cutting component 9 is arranged on the top of the mixing component 8, the middle part of the lifting and cutting component 9 is inserted into the inside of the mixing component 8, the bottom of the mixing component 8 is connected to the heat conducting component 5, the bottom of the heat conducting component 5 is arranged through the bottom surface of the protection box 3, the top surface of the protection box 3 is provided with a feeding component 4, the bottom of the feeding component 4 is passed through the inside of the protection box 3, the bottom of the feeding component 4 is connected to the inside of the mixing component 8, the top surface of the protection box 3 is provided with an air exchange component 6, and the air inlet and air outlet ends of the air exchange component 6 are both connected to the inside of the mixing component 8;

[0076] The mixing assembly 8 includes a second motor 81, a first cam 82, a first rotating shaft 83, a screw 84, a second rotating shaft 85, a second cam 86, a mixing box 87 and a discharge pipe 88. The mixing box 87 is fixed inside the protective box 3. The bottom surface of the mixing box 87 is an arc-shaped structure. The bottom surface of the mixing box 87 is fitted with a heat-conducting component 5. A discharge pipe 88 is connected to one side of the mixing box 87. One end of the discharge pipe 88 is connected to the inside of the lower box 7. The screw 84 is connected to the mixing box 87 and the discharge pipe 88. One end of the screw 84 is connected to the first rotating shaft 83. The rotating shaft 83 is connected to the side of the discharge box 7 away from the protection box 3. One end of the first rotating shaft 83 is connected to the second motor 81. The outer wall of the first rotating shaft 83 is sleeved with a first cam 82. The other end of the screw 84 is connected to the second rotating shaft 85. The second rotating shaft 85 is connected to the side wall of the protection box 3. The outer wall of the second rotating shaft 85 is sleeved with a second cam 86. The bottom of one side of the lifting and cutting component 9 is fitted with the first cam 82, and the bottom of the other side of the lifting and cutting component 9 is fitted with the second cam 86. The lifting and cutting component 9 is pushed by the first cam 82 and the second cam 86 to cut into the interior of the mixing box 87;

[0077] A protective box 71 is fixed inside the blanking box 7, a first rotating shaft 83 is rotatably connected to the inside of the protective box 71, a first cam 82 is provided inside the protective box 71, and two blanking rollers 72 are rotatably connected to the inside of the protective box 71;

[0078] After the material is conveyed into the mixing box 87, the material is moved and mixed by the screw 84, and the temperature of the material mixture is adjusted by the heat conducting component 5. When the screw 84 rotates, the first cam 82 and the second cam 86 cooperate to push the lifting and cutting component 9 to move up and down. During the reciprocating lifting and lowering process of the lifting and cutting component 9, the melamine formaldehyde resin mixed and conveyed in the mixing box 87 is cut open, and the larger bubbles inside are cut open to release the internal gas, which is then introduced into the discharge box 7 through the discharge pipe 88, thereby ensuring the density and quality of the melamine formaldehyde resin inside.

[0079] During the melamine formaldehyde resin conveying and mixing process, the generated gas and the gas released by the internal cutting are extracted through the air exchange component 6, and the gas is filtered and then reintroduced, so as to achieve timely cleaning of the gas, thereby ensuring the production quality of the melamine formaldehyde resin and the environmental friendliness of the production;

[0080] When the melamine formaldehyde resin is introduced into the discharge box 7 , the two discharge rollers 72 are used to roll and further compress the melamine formaldehyde resin discharge, thereby ensuring the synthesis quality of the melamine formaldehyde resin.

[0081] Example 2

[0082] like Figure 2-Figure 9 As shown, based on the above embodiment, this embodiment further provides the following content:

[0083] In order to achieve the above effects, the following structure is adopted;

[0084] The lifting and cutting assembly 9 includes a second lifting plate 91, a second elastic telescopic rod 92, a first rolling wheel 93, a third elastic telescopic rod 94 and a second rolling wheel 95. The second lifting plate 91 is connected with the second elastic telescopic rod 92 and the third elastic telescopic rod 94. The bottom end of the second elastic telescopic rod 92 is connected to the first rolling wheel 93. The first rolling wheel 93 rolls and fits the top of the first cam 82. The bottom end of the third elastic telescopic rod 94 is connected to the second rolling wheel 95. The second rolling wheel 95 rolls and fits the top of the second cam 86. The outer tubes of the second elastic telescopic rod 92 and the third elastic telescopic rod 94 are fixed to the bottom surface of the second lifting plate 91. The internal plug of the second elastic telescopic rod 92 is connected to the internal top surface of the unloading box 7. The internal plug of the third elastic telescopic rod 94 is connected to the internal top surface of the protective box 3. A plurality of cutting knives 911 are fixed to the bottom surface of the second lifting plate 91. The cutting knives 911 pass through and are inserted into the mixing box 87.

[0085] In this embodiment, a first partition 871 is fixed inside the mixing box 87, a second partition 872 is fixed to the bottom surface of the first partition 871, a third partition 874 is fixed to the side of the second partition 872 away from the first partition 871, the bottom surface of the third partition 874 is a sloped structure, a plurality of cutting knives 911 are inserted through the inside of the second partition 872, a motorized wheel 873 is provided on the top surface of the second partition 872, a plurality of pusher knives 8731 are fixed to the outer wall of the motorized wheel 873, and the bottom of the motorized wheel 873 is provided through the bottom of the second partition 872;

[0086] The first partition 871, the second partition 872 and the third partition 874 are used to reduce the conveying space of the mixed material in the mixing box 87, so as to facilitate the compression and discharge of the mixed material.

[0087] Inserting multiple cutting knives 911 into the second partition 872 allows the multiple cutting knives 911 to simultaneously cut the melamine formaldehyde resin when the melamine formaldehyde resin is delivered to the second partition 872, thereby ensuring the stability of the release of the gas inside the melamine formaldehyde resin.

[0088] An electric wheel 873 with a pusher knife 8731 is provided on the second partition plate 872. The electric wheel 873 can rotate to rotate the pusher knife 8731 and push the melamine formaldehyde resin to be transported, thereby ensuring the stability of the melamine formaldehyde resin transportation process.

[0089] In this embodiment, the air exchange assembly 6 includes an air pump 61, an air outlet pipe 62, a duct 63, a filter cover 64, a filter cartridge 65 and an exhaust pipe 66. The air pump 61 is arranged on the top surface of the protective box 3, and the air outlet on the bottom surface of the air pump 61 is connected to the air outlet pipe 62. The air outlet pipe 62 passes through and is connected to the inside of the mixing box 87. One end of the air outlet pipe 62 passes through and is connected to the inside of the first partition 871. The outlet of one end of the air outlet pipe 62 is arranged toward the cutting knife 911. The air inlet on the top surface of the air pump 61 is connected to the duct 63. One end of the duct 63 is connected to the filter cover 64. The bottom surface of the filter cover 64 is connected to the filter cartridge 65. The bottom surface of the filter cartridge 65 is connected to the exhaust pipe 66. One end of the exhaust pipe 66 is plugged into the side wall of the mixing box 87 near the discharge pipe 88.

[0090] By providing an air pump 61 connected to a filter cartridge 65 and connecting an exhaust pipe 66 through the mixing box 87 near the discharge pipe 88, the gas can be immediately extracted and recovered when the cutting knife 911 cuts the melamine formaldehyde resin and releases gas, thereby ensuring the quality of the melamine formaldehyde resin synthesis;

[0091] The recovered gas has its own heat, which can be guided to the cutting knife 911 through the air outlet pipe 62 after filtration, thereby heating the cutting knife 911 and ensuring that the cutting knife 911 has a high temperature to cut the melamine formaldehyde resin, thereby ensuring the stability of the released gas.

[0092] After passing through the cutting knife 911, the recovered gas is guided by the second partition 872 and the third partition 874, away from one end of the exhaust pipe 66, and deeper into the feeding position, which can assist in heating the feeding position, realize the reuse of heat, and circulate the internal air, promote gas recovery processing, and improve the utilization rate of heat and the efficiency of internal processing.

[0093] In this embodiment, a fixing plate 915 is fixed to the bottom surface of the second lifting plate 91, and a pusher plate 916 is fixed to the bottom surface of the fixing plate 915. The pusher plate 916 has an L-shaped structure, and a pressure scraper plate 917 is fixed to the bottom surface of the pusher plate 916. The bottom surface of the pressure scraper plate 917 is a circular arc groove structure for fitting with the outer wall of the first rotating shaft 83.

[0094] During the reciprocating lifting process of the second lifting plate 91, the push plate 916 is driven to lift and lower back and forth. When the discharge pipe 88 discharges the melamine formaldehyde resin, the push plate 916 pushes the material downward, and at the same time, the scraper plate 917 reciprocates with the first rotating shaft 83 to press and scrape off the melamine formaldehyde resin, thereby facilitating the discharge of the melamine formaldehyde resin.

[0095] Example 3

[0096] like Figure 2-Figure 9 As shown, based on the above embodiment, this embodiment further provides the following content:

[0097] In order to achieve the above effects, the following structure is adopted;

[0098] The feeding assembly 4 includes a first feeding tank 41, an alkali liquid tank 42, a second feeding tank 43 and a sealing component 44. The bottom end of the first feeding tank 41 is connected to a first feeding pipe 411, the bottom end of the alkali liquid tank 42 is connected to a liquid feeding pipe 421, and the bottom end of the second feeding tank 43 is connected to a second feeding pipe 431. The first feeding pipe 411, the liquid feeding pipe 421 and the second feeding pipe 431 are all connected to the inside of the mixing box 87. The top surface of the mixing box 87 is provided with a temporary storage box 875. There are two mirror images of the temporary storage box 875. The first feeding tank 41 is connected to the bottom end of the alkali liquid tank 42. The bottom end of the second feeding tank 43 is connected to the second feeding pipe 431. The first feeding pipe 411, the liquid feeding pipe 421 and the second feeding pipe 431 are all connected to the inside of the mixing box 87. The bottom ends of the tube 411 and the second feeding tube 431 are respectively arranged inside the two temporary storage boxes 875. The sealing component 44 is arranged between the two temporary storage boxes 875. The temporary storage box 875 is provided with a discharge port 8752 on the side close to the sealing component 44. The bottom end of the liquid feeding tube 421 is closed and a liquid outlet hole 4211 is provided on the side wall of the bottom end. The bottom end of the liquid feeding tube 421 is inserted into the interior of the sealing component 44. The sealing component 44 is raised and lowered to open and close the discharge port 8752 and the liquid outlet hole 4211. The bottom surface of the temporary storage box 875 is provided with an inclined heating plate 8751.

[0099] By introducing melamine and paraformaldehyde into the two temporary storage boxes 875 respectively, the alkali liquid tank 42 introduces the alkali liquid into the bottom end of the liquid adding pipe 421, and the melamine and paraformaldehyde are preheated by the inclined heating plate 8751. Then, the sealing component 44 rises to open the discharge port 8752 and the liquid outlet 4211, thereby improving the convenience of adding and mixing.

[0100] In this embodiment, the sealing component 44 includes a pneumatic rod 441, a first lifting plate 442, a sealing cylinder 443 and a side sealing plate 444. The pneumatic rod 441 is arranged on the top surface of the protective box 3. The telescopic bottom end of the pneumatic rod 441 is connected to the inside of the mixing box 87. The telescopic bottom end of the pneumatic rod 441 is connected to the first lifting plate 442. Side sealing plates 444 are fixed on both sides of the first lifting plate 442. The side sealing plates 444 are fitted and sealed to the outside of the discharge port 8752. The sealing cylinder 443 is inserted into the inside of the first lifting plate 442, and the bottom end of the liquid adding tube 421 is inserted into the inside of the sealing cylinder 443.

[0101] The first lifting plate 442 is pushed down by the pneumatic rod 441, and the side sealing plate 444 and the sealing cylinder 443 are opened at the same time, thereby improving the convenience and efficiency of feeding.

[0102] In this embodiment, a fixing frame 912 is fixed to the top surface of the second lifting plate 91, and a first elastic telescopic rod 913 is provided on the side wall of the fixing frame 912. The telescopic end of the first elastic telescopic rod 913 is connected to a rolling vibration wheel 914. A vibration guide plate 412 is fixed to the side wall of the first feeding tube 411. The side wall of the vibration guide plate 412 has a wavy structure, and one side of the rolling vibration wheel 914 is arranged to fit the wavy structure of the vibration guide plate 412.

[0103] During the reciprocating lifting process of the second lifting plate 91, the vibration wheel 914 rolls inside the wavy structure of the vibration guide plate 412, thereby vibrating the first feeding pipe 411, promoting discharge, and ensuring the quality of the discharge.

[0104] In this embodiment, the heat-conducting assembly 5 includes a first heating plate 51, a heat-insulating block 52, a heat-conducting plate 53, a second heating plate 54 and a heat-dissipating component 55. The first heating plate 51, the heat-conducting plate 53 and the second heating plate 54 are all fitted on the outer wall of the bottom surface of the mixing box 87. The heat-conducting plate 53 is arranged between the first heating plate 51 and the second heating plate 54. The heat-insulating block 52 is fixed between the first heating plate 51, the heat-conducting plate 53 and the second heating plate 54. The bottom surface of the heat-conducting plate 53 is connected to the heat-dissipating component 55, and the heat-dissipating component 55 is arranged through the bottom surface of the protective box 3.

[0105] The heat dissipation component 55 includes a heat dissipation box 551, a first motor 552, fan blades 553 and heat dissipation bars 54. The heat dissipation box 551 is fixed to the bottom surface of the protective box 3. A plurality of heat dissipation bars 54 are fixed to the side wall of the heat dissipation box 551. The heat dissipation bars 54 pass through and are fixed to the bottom surface of the heat conducting plate 53. The first motor 552 is arranged on the bottom surface of the heat dissipation box 551. The rotating top of the first motor 552 passes through the interior of the heat dissipation box 551. The rotating top of the first motor 552 is connected to the fan blades 553.

[0106] The mixing box is heated by the first heating plate 51 and the second heating plate 54, and then heat is transferred through the heat conduction plate 53 in the middle, and heat is dissipated in combination with the heat dissipation strip 54 to ensure a multi-stage heating effect.

[0107] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0108] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for synthesizing melamine formaldehyde resin based on recycled raw materials, characterized in that: The synthesis method comprises the following steps: S1, recovery of raw materials, purification and treatment; S1.1, melamine purification; Dissolve the melamine recovery material in water, then add an appropriate amount of activated carbon for stirring and adsorption to remove color and other organic impurities, remove the activated carbon particles through a filtration device, and evaporate and crystallize to obtain pure melamine crystals; S1.2, formaldehyde purification; The formaldehyde recovery material is distilled to remove most of the organic impurities and water, and further distilled to remove trace impurities to obtain pure paraformaldehyde; S2, melamine and formaldehyde mixed; S2.1, preliminary preheating; The alkaline solution and the recovered melamine and paraformaldehyde are stored separately in the mixing device, the melamine and paraformaldehyde are taken in a molar ratio of 1:1.5 to 1:1.8, and the taken melamine and paraformaldehyde are preheated to a temperature of 40 to 50°C; S2.2, prepolymerization mixing; The mixing equipment centrally stirs and mixes melamine and polyformaldehyde, and heats the mixture to 80°C to 90°C, while adding an alkaline solution to adjust the pH value to 7 to 8 to promote the polycondensation reaction and obtain a prepolymer; S2.3, gather and degas; The mixing device transports the polymer to concentrate, and before the prepolymer is completely concentrated, the prepolymer is mixed and heated to 120°C to 180°C to obtain melamine formaldehyde resin, and the inside of the melamine formaldehyde resin is cut to release the internal gas, and the melamine formaldehyde resin is gathered to the end of the mixing device; S3, extrusion discharging; The melamine formaldehyde resin is rolled at the end of the mixing device to derive compact melamine formaldehyde resin.

2. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 1, characterized in that: The mixing device comprises a bottom plate, two brackets are fixed on the top surface of the bottom plate, a protection box is fixed on the top surface of one bracket, a material discharge box is connected to one side of the protection box, the material discharge box is fixed to the top surface of the other bracket, a mixing component and a lifting and cutting component are arranged inside the protection box, one side of the mixing component and the lifting and cutting component are both connected through the inside of the material discharge box, the lifting and cutting component is arranged on the top of the mixing component, the middle part of the lifting and cutting component is plugged into the inside of the mixing component, the bottom of the mixing component is connected to the heat conduction component, the bottom of the heat conduction component is set through the bottom surface of the protection box, a feeding component is arranged on the top surface of the protection box, the bottom of the feeding component is set through the inside of the protection box, the bottom of the feeding component is connected through the inside of the mixing component, and an air exchange component is arranged on the top surface of the protection box, and the air inlet and air outlet of the air exchange component are both connected through the inside of the mixing component; The mixing assembly includes a second motor, a first cam, a first rotating shaft, a screw, a second rotating shaft, a second cam, a mixing box and a discharge pipe. The mixing box is fixed inside the protective box. The bottom surface of the mixing box is an arc-shaped structure. A heat-conducting assembly is fitted on the bottom surface of the mixing box. A discharge pipe is connected through one side of the mixing box. One end of the discharge pipe is connected through the inside of the discharge box. The screw is connected through the inside of the mixing box and the discharge pipe. One end of the screw is connected to the first rotating shaft. The first rotating shaft is connected through the side of the discharge box away from the protection box. One end of the first rotating shaft is connected to the second motor. The outer wall of the first rotating shaft is sleeved with the first cam. The other end of the screw is connected to the second rotating shaft. The second rotating shaft is connected through the side wall of the protection box. The outer wall of the second rotating shaft is sleeved with the second cam. The bottom of one side of the lifting and cutting assembly is fitted with the first cam, and the bottom of the other side of the lifting and cutting assembly is fitted with the second cam. The lifting and cutting assembly is pushed into the mixing box by the first cam and the second cam. A protection box is fixed inside the material discharge box, a first rotating shaft is rotatably connected to the inside of the protection box, a first cam is arranged inside the protection box, and two material discharge rollers are rotatably connected to the inside of the protection box.

3. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 2, characterized in that: The lifting and cutting assembly includes a second lifting plate, a second elastic telescopic rod, a first rolling wheel, a third elastic telescopic rod and a second rolling wheel. The second lifting plate is connected with the second elastic telescopic rod and the third elastic telescopic rod through the inside, the second elastic telescopic rod is connected with the first rolling wheel at the bottom end, the first rolling wheel rolls and fits the top of the first cam, the bottom end of the third elastic telescopic rod is connected with the second rolling wheel, the second rolling wheel rolls and fits the top of the second cam, the outer tubes of the second elastic telescopic rod and the third elastic telescopic rod are fixed to the bottom surface of the second lifting plate, the internal plug rod of the second elastic telescopic rod is connected to the internal top surface of the unloading box, the internal plug rod of the third elastic telescopic rod is connected to the internal top surface of the protection box, and a plurality of cutting knives are fixed to the bottom surface of the second lifting plate, and the cutting knives are inserted through and connected to the inside of the mixing box.

4. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 3, characterized in that: A first partition is fixed inside the mixing box, a second partition is fixed on the bottom of the first partition, a third partition is fixed on the side of the second partition away from the first partition, the bottom of the third partition is an inclined structure, a plurality of cutting knives are inserted through the second partition, an electric wheel is arranged on the top surface of the second partition, a plurality of pushing knives are fixed on the outer wall of the electric wheel, and the bottom of the electric wheel is arranged through the bottom of the second partition.

5. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 4, characterized in that: The air exchange assembly includes an air pump, an air outlet pipe, a duct, a filter cover, a filter cartridge and an exhaust pipe. The air pump is arranged on the top surface of the protection box. The air outlet on the bottom surface of the air pump is connected to the air outlet pipe, which passes through and is connected to the interior of the mixing box. One end of the air outlet pipe passes through and is connected to the interior of the first partition. The outlet at one end of the air outlet pipe is arranged to face the direction of the cutting knife. The air inlet on the top surface of the air pump is connected to the duct, one end of the duct is connected to the filter cover, the bottom surface of the filter cover is connected to the filter cartridge, the bottom surface of the filter cartridge is connected to the exhaust pipe, and one end of the exhaust pipe is plugged into the side wall of the mixing box near the discharge pipe.

6. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 3, characterized in that: A fixed plate is fixed on the bottom surface of the second lifting plate, a push plate is fixed on the bottom surface of the fixed plate, the push plate is an L-shaped structure, a pressure scraper is fixed on the bottom surface of the push plate, and the bottom surface of the pressure scraper is an arc groove structure for fitting with the outer wall of the first rotating shaft.

7. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 3, characterized in that: The feeding assembly comprises a first feeding tank, an alkali liquid tank, a second feeding tank and a sealing component. The bottom end of the first feeding tank is connected to a first feeding pipe, the bottom end of the alkali liquid tank is connected to a liquid adding pipe, and the bottom end of the second feeding tank is connected to a second feeding pipe. The first feeding pipe, the liquid adding pipe and the second feeding pipe are all connected through the interior of a mixing box. A temporary storage box is arranged on the top surface of the interior of the mixing box. Two temporary storage boxes are arranged in mirror image. The bottom ends of the first feeding pipe and the second feeding pipe are respectively arranged inside the two temporary storage boxes. The sealing component is arranged between the two temporary storage boxes. A discharge port is provided on one side of the temporary storage box close to the sealing component. The bottom end of the liquid adding pipe is closed and a liquid outlet hole is provided on the side wall of the bottom end. The bottom end of the liquid adding pipe is plugged into the interior of the sealing component. The sealing component is used to open and close the discharge port and the liquid outlet hole by lifting. An inclined heating plate is arranged on the bottom surface of the interior of the temporary storage box.

8. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 7, characterized in that: The sealing component includes a pneumatic rod, a first lifting plate, a sealing cylinder and a side sealing plate. The pneumatic rod is arranged on the top surface of the protection box. The telescopic bottom end of the pneumatic rod penetrates and is connected to the inside of the mixing box. The telescopic bottom end of the pneumatic rod is connected to the first lifting plate. Side sealing plates are fixed on both sides of the first lifting plate. The side sealing plates are fitted and sealed on the outside of the discharge port. A sealing cylinder is inserted into the first lifting plate, and the bottom end of the liquid adding tube is inserted into the sealing cylinder.

9. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 7, characterized in that: A fixing frame is fixed on the top surface of the second lifting plate, a first elastic telescopic rod is arranged on the side wall of the fixing frame, a rolling vibration wheel is connected to the telescopic end of the first elastic telescopic rod, a vibration guide plate is fixed on the side wall of the first feeding pipe, the side wall of the vibration guide plate is a wavy structure, and one side of the rolling vibration wheel is arranged to fit the wavy structure of the vibration guide plate.

10. The method for synthesizing melamine formaldehyde resin based on recycled raw materials according to claim 2, characterized in that: The heat conduction assembly includes a first heating plate, a heat insulation block, a heat conduction plate, a second heating plate and a heat dissipation component. The first heating plate, the heat conduction plate and the second heating plate are all arranged on the outer wall of the bottom surface of the mixing box. The heat conduction plate is arranged between the first heating plate and the second heating plate. The heat insulation block is fixed between the first heating plate, the heat conduction plate and the second heating plate. The bottom surface of the heat conduction plate is connected to the heat dissipation component, and the heat dissipation component is arranged through the bottom surface of the protection box; The heat dissipation component includes a heat dissipation box, a first motor, fan blades and heat dissipation strips. The heat dissipation box is fixed to the bottom surface of the protective box. A plurality of heat dissipation strips are fixed to the side walls of the heat dissipation box. The heat dissipation strips penetrate and are fixed to the bottom surface of the heat conduction plate. The first motor is arranged on the bottom surface of the heat dissipation box. The rotating top end of the first motor penetrates the interior of the heat dissipation box. The rotating top end of the first motor is connected to the fan blades.

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