Low-voc flame-retardant sponge for automobiles and processing technology thereof

Abstract

The present application relates to a kind of low VOC fire-retardant sponge for automobile processing technology, it is characterized in that: specific and include the following steps:S1: preparation RGO / TiO2 Nanoparticle;S2: material weighing;S3: grinding mixing;S4: shaping maturation;S5: heating odor removal;S6: cutting into warehouse.The above-mentioned method used in the present application has the advantages of simple operation, high production efficiency and environmental protection and energy saving.

Description

Technical Field

[0001] This invention relates to the field of sponge production technology, specifically to a low-VOC flame-retardant sponge for automobiles and its processing technology. Background Technology

[0002] Polyurethane foam is widely used in the automotive interior industry due to its advantages such as good thermoplasticity, high strength, high elongation, good resilience, wear resistance, oil resistance, solvent resistance, aging resistance, and low-temperature resistance. However, the materials used in the synthesis of polyurethane foam contain a large amount of benzene compounds and aldehydes. Furthermore, the production and processing of polyurethane foam for automotive interiors generates a large amount of VOC gases, polluting the in-vehicle environment and posing a significant health hazard.

[0003] Research on reducing VOCs in polyurethane foam has been ongoing both domestically and internationally. Methods include replacing traditional tertiary amine catalysts with non-volatile or reactive amine catalysts, replacing volatile TDI (toluene diisocyanate) with low-volatility MDI (diphenylmethane diisocyanate), using non-volatile or reactive silicone foam stabilizers and flame retardants, and adding self-catalytic or self-flame-retardant polyether polyols. For example, the [Refining Method of Low-Odor, High-Activity Polyether Polyol] disclosed in patent CN106832249A reduces the aldehyde content of the polyether polyol used in the synthesis of foam by adding alkali metal ions. While this method reduces VOCs from polyurethane foam to some extent, toxic and harmful gases from the raw material polyether polyol and those generated during the combustion of foam in automotive interior manufacturing remain the main sources of VOC emissions from polyurethane foam, severely limiting its use.

[0004] Currently, the production of sponges still relies on manual weighing and proportioning, which is very cumbersome and greatly affects processing efficiency. Therefore, it is particularly important to design a low-VOC flame-retardant sponge for automobiles and its processing technology in order to solve the above problems. Summary of the Invention

[0005] To address the aforementioned problems, this invention designs a low-VOC flame-retardant sponge for automobiles and its processing technology. By employing an automatic weighing mechanism and a grinding and mixing box, the weighing, conveying, and mixing of raw materials can be completed automatically, greatly improving production efficiency, reducing the workload of operators, and enhancing practicality.

[0006] To solve the above-mentioned technical problems, the present invention provides a processing technology for low-VOC flame-retardant sponge for automobiles, characterized by the following steps: S1: Preparation of RGO / TiO2 nanoparticles; S2: The polyether polyol A, polyether polyol B, PPG, diphenylmethane diisocyanate, foam stabilizer, foaming agent, flame retardant, catalyst, chain extender and RGO / TiO2 nanoparticles are weighed by an automatic weighing mechanism according to the mass fractions. S3: The raw materials weighed in step S1 above, except for diphenylmethane diisocyanate, are automatically fed into the grinding and mixing box in sequence. Water is added while feeding, and the materials are ground and mixed in the grinding and mixing box to make solution A. Then, diphenylmethane diisocyanate is automatically added into the grinding and mixing box for high-speed mixing. The mixing time is 10-15 seconds. S4: Quickly feed the raw materials mixed in step S3 into the foaming machine, degas them under vacuum for 5 minutes, and then discharge them. The foaming machine is used to form the sponge, and the formed sponge is cured at room temperature for 72 hours to obtain the finished sponge. S5: The sponge that has been cured and shaped in step S4 above is transported to the deodorizing machine and deodorized by heating. S6: Cut the deodorized sponge from step S5 into pieces according to the actual needs of the car. Pack the cut sponge into a warehouse and store it. Recycle the scraps after cutting.

[0007] Further: The specific preparation method of RGO / TiO2 nanoparticles in step S1 is as follows: 0-250 parts of graphene oxide are added to a mixed solution of ethanol and deionized water and ultrasonically vibrated for 30 min. Then, the mixed solution is transferred to a hydrothermal reactor, and 50 parts of TiO2 powder are poured into the hydrothermal reactor in multiple batches while stirring at high speed for 10 min. The temperature is raised to 120℃ and stirred for 3 h. After the reaction is completed, the final product is washed with ethanol and deionized water until neutral, and finally dried at 80℃ to obtain RGO / TiO2 nanoparticles.

[0008] Furthermore: the automatic weighing mechanism includes a support base, a turntable, a first storage seat, a second storage seat, a first weighing cylinder, and a second weighing cylinder. The support base is horizontally positioned via a column at the bottom. A connecting groove matching the turntable is formed at the top of the support base. The lower end of the turntable is rotatably connected to the connecting groove and linked to a rotary drive mechanism. Nine first storage seats are evenly distributed on the turntable, each containing one first weighing cylinder. A second storage seat is fixed to the support base on the left side of the turntable, and the second weighing cylinder is placed within it. Weighing sensors are installed in both the first and second storage seats. The lower ends of the first and second weighing cylinders are supported and connected to the first and second storage seats respectively via the weighing sensors. The lower ends of both the first and second storage seats are open. The first and second weighing cylinders are equipped with electric unloading valves at their bottoms. A first material guide groove is provided on each of the nine storage seats on the turntable. A second material guide groove is provided on the support base directly below the right end of the connecting groove. The weighing cylinders in the nine storage seats are driven sequentially through the top of the second material guide grooves via a rotary drive mechanism. The upper ends of both the first and second weighing cylinders are equipped with integrated material guide seats. The inlet at the top of each material guide seat is connected to a circular material guide pipe. The lower end of the material guide pipe extends from the inlet into the material guide seat and is sealed to the material guide seat via a rubber sealing ring fitted on the outer wall. A third material guide groove is provided on the support base directly below the second storage seat. The electric unloading valve at the bottom of the second weighing cylinder is connected to a discharge pipe, which extends out of the support base along the third material guide groove.

[0009] Furthermore, a pressurized gas inlet is provided on the side wall of the second weighing cylinder. The pressurized gas inlet is sealed by a first pressurized valve installed on the outer wall of the second weighing cylinder. The first pressurized valve is connected to a first pressurized gas delivery pipeline.

[0010] Furthermore: the rotary drive mechanism includes a first servo motor, a drive gear, and an external gear ring. The external gear ring is fixed to the outer wall of the turntable and rotates with it. The first servo motor is fixed to the outer wall of the support base. The drive gear is fixed to the output shaft of the first servo motor and meshes with the external gear ring.

[0011] Furthermore: a retractable guide pipe is provided at the bottom of the support base directly below the second guide channel. The grinding and mixing box is located directly below the support base. The lower end of the retractable guide pipe is connected to the feed cylinder at the top of the grinding and mixing box. The grinding and mixing box includes an upper box body, a lower box body, a grinding and crushing wheel, and a screening plate. The upper box body and the lower box body are detachably connected. The lower end of the upper box body and the upper end of the lower box body are both open. The feed cylinder is located at the top of the upper box body and is connected to it. The lower end of the upper box body has an inner... The wall is truncated cone-shaped. The grinding wheel is rotatably connected to the lower end of the upper box via a first rotating shaft. The lower end of the grinding wheel extends into the lower box. The sieve plate is positioned directly below and matches the grinding wheel. The sieve plate is detachably fixed to the bottom of the upper box by bolts. An ultrasonic stirring device is installed in the lower box. The bottom of the lower box is connected to the discharge pipe via a discharge valve. A water inlet is provided at the top of the upper box. The water inlet is connected to the water inlet pipe via a valve connector fixed at the top of the upper box.

[0012] Furthermore: a mounting base is fixed inside the feed cylinder via a connector. A conical guide block is provided on the top of the mounting base, and a third servo motor is installed at the bottom of the mounting base. The output shaft of the third servo motor is connected to a vertically arranged second rotating shaft. A distribution disc that rotates together with the second rotating shaft is fitted and fixed on the second rotating shaft. Four L-shaped baffle assemblies are connected to the second rotating shaft directly below the distribution disc. The inner wall of the upper end of the upper housing is circular. The four L-shaped baffle assemblies are rotatably connected to and matched with the upper end of the upper housing. The top of the distribution disc is an open feed inlet located at... Directly below the feed cylinder, a conical guide seat is provided at the bottom of the distribution plate. Several discharge ports are evenly distributed on the outer wall of the distribution plate. The second rotating shaft is a hollow rotating shaft, with its lower end connected to a second rotary joint. The rotary joint is connected to an air inlet pipe and a water inlet pipe, respectively. Several first injection holes are evenly distributed on the outer wall of the second rotating shaft. A flow guide channel is provided at the lower end of the L-shaped baffle assembly, and the flow guide channel is connected to the second rotating shaft. A second injection hole is provided at the bottom of the L-shaped baffle assembly, and the second injection hole is connected to the flow guide channel.

[0013] Furthermore: In step S4, the formed sponge is automatically cured by placing it on a rack inside the curing chamber. The rack consists of a first conveyor frame, a second conveyor frame, a lower support frame, an upper support plate, and a fixed walking assembly. There are three or more first conveyor frames arranged sequentially from top to bottom. Adjacent first conveyor frames are fixedly connected to each other via connecting columns. Several first conveyor rollers are arranged sequentially from left to right inside each first conveyor frame, with the upper ends of the first conveyor rollers extending out of the first conveyor frame. A lower support frame is located to the left of the lowest first conveyor frame, and is horizontally positioned and integrated with the first conveyor frame to its right. The upper support plate is positioned directly above the lower support frame via guide columns, and its lower end is higher than the highest first conveyor frame. The second conveyor frame is horizontally connected to the lower support frame via a height adjustment mechanism. Between the frame and the upper support plate, several second conveyor rollers are arranged sequentially from left to right in the second conveyor frame. The upper ends of the second conveyor rollers extend out of the second conveyor frame. The second conveyor rollers are matched with the first conveyor rollers. Fixed walking components are provided at the bottom of the lower first conveyor frame and the bottom of the lower support frame. The fixed walking components consist of support legs, hollow support columns, mounting plates, lifting cylinders, guide blocks, and walking wheels. Support legs are connected to the bottom of the lower first conveyor frame and the lower support frame through hollow support columns. The lifting cylinder is installed in the lower end of the hollow support column. The output shaft end of the lifting cylinder is connected to the guide block that slides up and down in the hollow support column. The walking wheels are fixed to the bottom of the mounting plate. One end of the mounting plate extends into the hollow support column and is connected to the guide block. A through groove is opened on the side wall of the hollow support column for the mounting plate to extend into. The mounting plate can move up and down along the through groove.

[0014] Furthermore: the height adjustment mechanism includes a second servo motor, a lead screw, and a connecting seat. The second servo motor is mounted on the top of the upper support plate, and the output shaft of the second servo motor passes through the upper support plate and is connected to the upper end of the lead screw. The lead screw is placed vertically, and its lower end is rotatably connected to the top of the lower support frame. The second conveyor frame is slidably connected to the guide column through a guide cylinder set on the outer wall. The connecting seat is fixed on the outer wall of the second conveyor frame. The second conveyor frame is connected to the lead screw through the connecting seat. A threaded through hole matching the lead screw is opened between the upper and lower ends of the connecting seat, and the lead screw passes through the connecting seat along the threaded through hole.

[0015] Furthermore: A low-VOC flame-retardant sponge for automobiles produced using the above processing technology specifically comprises the following components by weight: 35-40 parts of polyether polyol A, 35-40 parts of polyether polyol B, 40-50 parts of PPG, 40-50 parts of diphenylmethane diisocyanate, 2-3 parts of foam stabilizer, 4-5 parts of foaming agent, 1-2 parts of flame retardant, 1-2 parts of catalyst, 0.5-1 part of chain extender, and 0.5-1 part of RGO / TiO2 nanoparticles. Polyether polyol A is a grafted polyether polyol, polyether polyol B is a highly active polyether polyol, the catalyst is one of tetramethyldisyltriamine and hydroxyethylpropylene diamine, and the flame retardant is 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2,2,2,]octane.

[0016] The beneficial effects of the present invention after adopting the above structure are as follows: The present invention employs an automatic weighing mechanism and a grinding and mixing box, which can automatically complete the weighing, conveying and mixing of raw materials, greatly improving production efficiency and reducing the workload of operators.

[0017] This invention automatically completes the grinding and pulverizing of raw materials during the conveying process, thereby making the raw materials mix more quickly and evenly, and greatly improving processing efficiency.

[0018] The curing chamber rack of this invention can be automatically controlled to move or remain stationary via a fixed walking component, which facilitates the storage and transportation of sponges and enhances its practicality. Attached Figure Description

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] Figure 1 This is a process flow diagram of the present invention.

[0021] Figure 2 This is a diagram showing the connection structure between the automatic weighing mechanism and the grinding and mixing chamber.

[0022] Figure 3 for Figure 2 A magnified view of A in the middle.

[0023] Figure 4 This is a diagram of the internal structure of the grinding and mixing chamber.

[0024] Figure 5 This is a schematic diagram of the shelf structure.

[0025] Figure 6 This is a structural diagram of the fixed walking component. Detailed Implementation

[0026] like Figure 1The present invention provides a processing technology for low-VOC flame-retardant sponge for automobiles, specifically including the following steps: S1: Preparation of RGO / TiO2 nanoparticles; S2: The polyether polyol A, polyether polyol B, PPG, diphenylmethane diisocyanate, foam stabilizer, foaming agent, flame retardant, catalyst, chain extender and RGO / TiO2 nanoparticles are weighed by an automatic weighing mechanism according to the mass fractions. S3: The raw materials weighed in step S1 above, except for diphenylmethane diisocyanate, are automatically fed into the grinding and mixing box in sequence. Water is added while feeding, and the materials are ground and mixed in the grinding and mixing box to make solution A. Then, diphenylmethane diisocyanate is automatically added into the grinding and mixing box for high-speed mixing. The mixing time is 10-15 seconds. S4: Quickly feed the raw materials mixed in step S3 into the foaming machine, degas them under vacuum for 5 minutes, and then discharge them. The foaming machine is used to form the sponge, and the formed sponge is cured at room temperature for 72 hours to obtain the finished sponge. S5: The sponge that has been cured and shaped in step S4 above is transported to the deodorizing machine and deodorized by heating. S6: Cut the deodorized sponge from step S5 into pieces according to the actual needs of the car. Pack the cut sponge into a warehouse and store it. Recycle the scraps after cutting.

[0027] The specific preparation method of RGO / TiO2 nanoparticles in step S1 above is as follows: 0-250 parts of graphene oxide are added to a mixed solution of ethanol and deionized water and ultrasonically vibrated for 30 min. Then, the mixed solution is transferred to a hydrothermal reactor, and 50 parts of TiO2 powder are poured into the hydrothermal reactor in multiple batches while stirring at high speed for 10 min. The temperature is raised to 120℃ and stirred for 3 h. After the reaction is completed, the final product is washed with ethanol and deionized water until neutral, and finally dried at 80℃ to obtain RGO / TiO2 nanoparticles.

[0028] like Figure 2The automatic weighing mechanism shown includes a support base 1, a turntable 15, a first storage seat 4-1, a second storage seat 4-2, a first weighing cylinder 5-1, and a second weighing cylinder 5-2. The support base is horizontally positioned via a column at the bottom. A connecting groove matching the turntable is formed at the top of the support base. The lower end of the turntable is rotatably connected to the connecting groove and linked to a rotary drive mechanism. Nine first storage seats are evenly arranged on the turntable, each containing one first weighing cylinder. A second storage seat is fixed to the support base on the left side of the turntable, and the second weighing cylinder is placed within it. Weighing sensors are installed in both the first and second storage seats. The lower ends of the first and second weighing cylinders are supported and connected to the first and second storage seats respectively via the weighing sensors. The lower ends of both the first and second storage seats are horizontally positioned... In an open configuration, both the first and second weighing cylinders are equipped with electric unloading valves at their bottoms. A first material guide groove is located on the turntable relative to each of the nine storage seats. A second material guide groove is located on the support base directly below the right end of the connecting groove. The first weighing cylinders within the nine first storage seats are driven sequentially through the top of the second material guide grooves via a rotary drive mechanism. Both the first and second weighing cylinders have an integrally integrated material guide seat 6 at their upper ends. The inlet at the top of each material guide seat is connected to a circular material guide pipe 7. The lower end of the material guide pipe extends from the inlet into the material guide seat and is sealed to it via a rubber sealing ring fitted on the outer wall. A third material guide groove is located on the support base directly below the second storage seat. The electric unloading valve at the bottom of the second weighing cylinder is connected to a discharge pipe 10, which extends out of the support base along the third material guide groove. Polyether polyol A, polyether polyol B, PPG, foam stabilizer, foaming agent, flame retardant, catalyst, chain extender, and RGO / TiO2 nanoparticles are sequentially weighed into proportions through the first weighing cylinders in nine first storage seats. Diphenylmethane diisocyanate is weighed through the second weighing cylinder in the second storage seat. After weighing, the raw materials in the nine first weighing cylinders on the turntable are sequentially transported to the top of the second feed channel for unloading. After preliminary mixing, the diphenylmethane diisocyanate weighed in the second weighing cylinder is rapidly conveyed out for final mixing. This invention, through the use of an automatic weighing mechanism and grinding and mixing box, can automatically complete the weighing, conveying, and mixing of raw materials, greatly improving production efficiency and reducing the workload of operators.

[0029] like Figure 2The second weighing cylinder shown has a pressurized gas inlet on its side wall. This inlet is sealed by a first pressurized valve 8 installed on the outer wall of the second weighing cylinder. The first pressurized valve is connected to a first pressurized gas delivery pipe 9. This invention enables the rapid delivery of diphenylmethane diisocyanate from the second weighing cylinder into the grinding and mixing chamber for mixing via pressurization.

[0030] like Figure 3 The rotary drive mechanism shown includes a first servo motor 18, a drive gear 16, and an external gear ring 17. The external gear ring is fixed to the outer wall of the turntable and rotates with it. The first servo motor is fixed to the outer wall of the support base. The drive gear is fixed to the output shaft of the first servo motor and meshes with the external gear ring.

[0031] like Figure 2 and Figure 4 A retractable guide pipe 3 is provided at the bottom of the support base directly below the second guide channel. The grinding and mixing box 14 is located directly below the support base. The lower end of the retractable guide pipe is connected to the feed cylinder 14-3 at the top of the grinding and mixing box via a sealing valve 11. The grinding and mixing box includes an upper box body 14-1, a lower box body 14-2, a grinding and crushing wheel 14-10, and a screening plate 14-11. The upper box body and the lower box body are detachably connected. The lower end of the upper box body and the upper end of the lower box body are both open. The feed cylinder is located at the top of the upper box body and is connected to it. The inner wall of the lower end of the upper box body is frustum-shaped. The grinding and crushing wheel is rotatably connected to the upper box body via a first rotating shaft. Inside the lower end of the upper chamber, the lower end of the grinding wheel extends into the lower chamber. The screening plate is positioned directly below and matches the grinding wheel. The screening plate is detachably fixed to the bottom of the upper chamber with bolts. An ultrasonic stirring device is installed in the lower chamber. The bottom of the lower chamber is connected to the discharge pipe via discharge valves 14-12. One end of the discharge pipe extending out of the third guide channel is connected to the side wall of the lower chamber. The lower chamber is also connected to the second pressurized gas conveying pipe 13 via a second pressurized valve 12 located on the outer wall. A water inlet is provided at the top of the upper chamber, and the water inlet is connected to the water inlet pipe via a valve connector fixed at the top of the upper chamber. Raw materials from the nine first weighing cylinders on the turntable enter the upper chamber and are first crushed to prevent agglomeration. Then, they pass through the screening plate and enter the lower chamber for preliminary mixing. Then, the raw materials from the second weighing cylinders are quickly added to the lower chamber for final mixing under pressure. After mixing, the mixture is quickly conveyed into the foaming machine under pressure. With the above structure, the present invention automatically completes the grinding and pulverizing of raw materials during the conveying process, thereby making the raw materials mix more quickly and evenly, and greatly improving the processing efficiency.

[0032] like Figure 4 The feed cylinder shown has a mounting base 14-5 fixed inside via a connector. A conical guide block 14-7 is mounted on the top of the mounting base. A third servo motor 14-6 is mounted on the bottom of the mounting base. The output shaft of the third servo motor is connected to a vertically arranged second rotating shaft 14-14. A distribution disc 14-8, which rotates together with the second rotating shaft, is mounted on the second rotating shaft. Four L-shaped baffle assemblies 14-9 are connected to the second rotating shaft directly below the distribution disc. The inner wall of the upper part of the upper housing is circular. The four L-shaped baffle assemblies are rotatably connected to and match the upper part of the upper housing. The top of the distribution disc is... An open feed inlet is located directly below the feed cylinder. A conical guide seat is located at the bottom of the distribution plate. Several discharge ports are evenly distributed on the outer wall of the distribution plate. The second rotating shaft is hollow, with its lower end connected to a second rotary joint. The rotary joint is connected to both an air inlet pipe and a water inlet pipe. Several first injection holes are evenly distributed on the outer wall of the second rotating shaft. A flow guide channel is located at the lower end of the L-shaped baffle assembly, and this channel is connected to the second rotating shaft. Second injection holes are located at the bottom of the L-shaped baffle assembly, and these holes are connected to the flow guide channel. Raw materials fall into the distribution plate along the feed cylinder. They first collide with the conical guide seat at the bottom of the distribution plate and then splash outwards. During this process, the raw materials undergo initial crushing. This portion of the raw material enters the upper chamber and collides with the L-shaped baffle assembly for further crushing. Finally, after passing through a grinding wheel and being processed, it passes through a screening plate and enters the lower chamber for mixing. This invention injects compressed gas and water into the second rotating shaft through the air inlet pipe and water inlet pipe, and uses the first and second injection holes to blow the material remaining on the inner wall of the distribution plate, the inner wall of the upper chamber, and the grinding wheel into the lower chamber, thus saving resources.

[0033] like Figure 5 and Figure 6In step S4, the formed sponge is automatically cured by placing it on a rack inside the curing chamber. The rack consists of a first conveyor frame 19, a second conveyor frame 25, a lower support frame 22, an upper support plate 24, and a fixed walking assembly 31. Three or more first conveyor frames are arranged sequentially from top to bottom, with adjacent first conveyor frames fixedly connected by connecting columns 21. Several first conveyor rollers 20 are arranged sequentially from left to right inside each first conveyor frame, with the upper ends of the first conveyor rollers extending out of the first conveyor frame. A lower support frame is located to the left of the lowest first conveyor frame, horizontally positioned and integrated with the first conveyor frame to its right. The upper support plate is positioned directly above the lower support frame via guide columns 23, with its lower end higher than the highest first conveyor frame. The second conveyor frame is horizontally connected to the lower support frame via a height adjustment mechanism. Between the upper support plates, several second conveyor rollers 26 are arranged sequentially from left to right in the second conveyor frame. The upper ends of the second conveyor rollers extend out of the second conveyor frame. The second conveyor rollers are matched with the first conveyor rollers. Fixed walking components are provided at the bottom of the lower first conveyor frame and the bottom of the lower support frame. The fixed walking components are composed of support legs 31-2, hollow support columns 31-1, mounting plates 31-4, lifting cylinders, guide blocks, and walking wheels 31-3. Support legs are connected to the bottom of the lower first conveyor frame and the lower support frame through hollow support columns. The lifting cylinder is installed in the lower end of the hollow support column. The output shaft end of the lifting cylinder is connected to the guide block that slides up and down in the hollow support column. The walking wheels are fixed to the bottom of the mounting plate. One end of the mounting plate extends into the hollow support column and is connected to the guide block. A through groove is opened on the side wall of the hollow support column for the mounting plate to extend into. The mounting plate can move up and down along the through groove. During operation, the height of the second conveyor frame is first adjusted. The formed sponge is automatically conveyed onto the second conveyor frame via the second conveyor roller. The height is then adjusted further until the second conveyor frame is flush with the empty first conveyor frame. The sponge from the second conveyor frame is then transported onto the first conveyor frame for placement via the cooperation of the first and second conveyor rollers. Finally, the entire placement frame is transported to the curing position within the curing chamber via a fixed traveling assembly. This invention allows for automatic control of the placement frame's movement within the curing chamber via a fixed traveling assembly, facilitating sponge storage and transportation and enhancing practicality.

[0034] like Figure 5The height adjustment mechanism shown includes a second servo motor 30, a lead screw 28, and a connecting seat 29. The second servo motor is mounted on the top of the upper support plate, and the output shaft of the second servo motor passes through the upper support plate and is connected to the upper end of the lead screw. The lead screw is placed vertically, and its lower end is rotatably connected to the top of the lower support frame. The second conveyor frame is slidably connected to the guide column through a guide cylinder set on the outer wall. The connecting seat is fixed on the outer wall of the second conveyor frame. The second conveyor frame is connected to the lead screw through the connecting seat. A threaded through hole matching the lead screw is opened between the upper and lower ends of the connecting seat, and the lead screw passes through the connecting seat along the threaded through hole.

[0035] A low-VOC flame-retardant automotive sponge produced using the above-mentioned processing technology specifically comprises the following components in parts by weight: 35-40 parts of polyether polyol A, 35-40 parts of polyether polyol B, 40-50 parts of PPG, 40-50 parts of diphenylmethane diisocyanate, 2-3 parts of foam stabilizer, 4-5 parts of foaming agent, 1-2 parts of flame retardant, 1-2 parts of catalyst, 0.5-1 part of chain extender, and 0.5-1 part of RGO / TiO2 nanoparticles. Polyether polyol A is a grafted polyether polyol, polyether polyol B is a highly active polyether polyol, the catalyst is one of tetramethyldisyltriamine and hydroxyethylpropylene diamine, and the flame retardant is 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2,2,2,]octane.

[0036] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A processing technology for low-VOC flame-retardant sponge for automobiles, characterized in that: Specifically, the following steps are included: S1: Preparation of RGO / TiO2 nanoparticles; S2: The polyether polyol A, polyether polyol B, PPG, diphenylmethane diisocyanate, foam stabilizer, foaming agent, flame retardant, catalyst, chain extender and RGO / TiO2 nanoparticles are weighed by an automatic weighing mechanism according to the mass fractions. S3: The raw materials weighed in step S1 above, except for diphenylmethane diisocyanate, are automatically fed into the grinding and mixing box in sequence. Water is added while feeding, and the materials are ground and mixed in the grinding and mixing box to make solution A. Then, diphenylmethane diisocyanate is automatically added into the grinding and mixing box for high-speed mixing. The mixing time is 10-15 seconds. S4: Quickly feed the raw materials mixed in step S3 into the foaming machine, degas them under vacuum for 5 minutes, and then discharge them. The foaming machine is used to form the sponge, and the formed sponge is cured at room temperature for 72 hours to obtain the finished sponge. S5: The sponge that has been cured and shaped in step S4 above is transported to the deodorizing machine and deodorized by heating. S6: Cut the deodorized sponge from step S5 according to the actual needs of the car, pack the cut sponge into a warehouse and store it, and recycle the cut scraps. The automatic weighing mechanism includes a support base (1), a turntable (15), a first storage seat (4-1), a second storage seat (4-2), a first weighing cylinder (5-1), and a second weighing cylinder (5-2). The support base is horizontally positioned via a column at the bottom. A connecting groove matching the turntable is provided on the top of the support base. The lower end of the turntable is rotatably connected to the connecting groove and connected to a rotary drive mechanism. Nine first storage seats are evenly arranged on the turntable, each containing one first weighing cylinder. A second storage seat is fixed on the support base to the left of the turntable, and the second weighing cylinder is placed inside the second storage seat. Weighing sensors are installed in both the first and second storage seats. The lower ends of the first and second weighing cylinders are supported and connected to the first and second storage seats respectively via the weighing sensors. Both ends are open. The bottom of the first weighing cylinder and the second weighing cylinder are equipped with electric unloading valves. The turntable is provided with a first material guide groove at the position of each of the nine storage seats. The support seat directly below the right end of the connecting groove is provided with a second material guide groove. The weighing cylinders in the nine storage seats are driven by a rotary drive mechanism to pass through the top of the second material guide groove in sequence. The upper end of the first weighing cylinder and the second weighing cylinder are provided with a material guide seat (6) integrated with them. The inlet of the top of the material guide seat is connected to a material guide pipe (7). The inlet is circular. The lower end of the material guide pipe extends from the inlet into the material guide seat and is sealed to the material guide seat through a rubber sealing ring sleeved on the outer wall. The support seat directly below the second storage seat is provided with a third material guide groove. The electric unloading valve at the bottom of the second weighing cylinder is connected to the discharge pipe (10). The discharge pipe extends out of the support seat along the third material guide groove. A retractable guide pipe (3) is provided at the bottom of the support base directly below the second guide channel. The grinding and mixing box (14) is located directly below the support base. The lower end of the retractable guide pipe is connected to the feed cylinder (14-3) at the top of the grinding and mixing box through a sealing valve (11). The grinding and mixing box includes an upper box body (14-1), a lower box body (14-2), a grinding and crushing wheel (14-10), and a screening plate (14-11). The upper box body and the lower box body are detachably connected. The lower end of the upper box body and the upper end of the lower box body are both open. The feed cylinder is located at the top of the upper box body and is connected to it. The inner wall of the lower end of the upper box body is frustum-shaped. The grinding and crushing wheel rotates through the first rotating shaft. The upper box is connected to the lower end of the upper box. The lower end of the grinding wheel extends into the lower box. The sieve plate is set directly below the grinding wheel and matches it. The sieve plate is detachably fixed to the bottom of the upper box by bolts. An ultrasonic stirring device is installed in the lower box. The bottom of the lower box is connected to the discharge pipe through the discharge valve (14-12). One end of the discharge pipe extending out of the third guide channel is connected to the side wall of the lower box and they are connected. The lower box is also connected to the second pressurized gas conveying pipe (13) through the second pressurized valve (12) set on the outer wall. The top of the upper box is provided with a water inlet. The water inlet is connected to the water inlet pipe through the valve joint fixed to the top of the upper box. A mounting base (14-5) is fixed inside the feed cylinder via a connector. A conical guide block (14-7) is provided on the top of the mounting base. A third servo motor (14-6) is installed at the bottom of the mounting base. The output shaft of the third servo motor is connected to a vertically arranged second rotating shaft (14-14). A distribution disc (14-8) that rotates together with the second rotating shaft is fitted and fixed on the second rotating shaft. Four L-shaped baffle assemblies (14-9) are connected to the second rotating shaft directly below the distribution disc. The inner wall of the upper end of the upper box is circular. The four L-shaped baffle assemblies are rotatably connected to and matched with the upper end of the upper box. The top of the distribution plate has an open feed inlet located directly below the feed cylinder. A conical guide seat is provided at the bottom of the distribution plate. Several discharge ports are evenly distributed on the outer wall of the distribution plate. The second rotating shaft is a hollow rotating shaft, with its lower end connected to a second rotary joint. The rotary joint is connected to an air inlet pipe and a water inlet pipe, respectively. Several first injection holes are evenly distributed on the outer wall of the second rotating shaft. A flow guide channel is provided in the lower end of the L-shaped baffle assembly, and the flow guide channel is connected to the second rotating shaft. A second injection hole is provided at the bottom of the L-shaped baffle assembly, and the second injection hole is connected to the flow guide channel.

2. The processing technology of a low-VOC flame-retardant sponge for automobiles according to claim 1, characterized in that: The specific preparation method of RGO / TiO2 nanoparticles in step S1 is as follows: 0-250 parts of graphene oxide are added to a mixed solution of ethanol and deionized water and ultrasonically vibrated for 30 min. Then, the mixed solution is transferred to a hydrothermal reactor, and 50 parts of TiO2 powder are added to the hydrothermal reactor in multiple batches while stirring at high speed for 10 min. The temperature is raised to 120℃ and stirred for 3 h. After the reaction is completed, the final product is washed with ethanol and deionized water until neutral, and finally dried at 80℃ to obtain RGO / TiO2 nanoparticles.

3. The processing technology of a low-VOC flame-retardant sponge for automobiles according to claim 1, characterized in that: The second weighing cylinder has a pressurized gas inlet on its side wall. The pressurized gas inlet is sealed by a first pressurized valve (8) installed on the outer wall of the second weighing cylinder. The first pressurized valve is connected to a first pressurized gas delivery pipe (9).

4. The processing technology for a low-VOC flame-retardant sponge for automobiles according to claim 1, characterized in that: The rotary drive mechanism includes a first servo motor (18), a drive gear (16), and an external gear ring (17). The external gear ring is fixed to the outer wall of the turntable and rotates with it. The first servo motor is fixed to the outer wall of the support base. The drive gear is fixed to the output shaft of the first servo motor and meshes with the external gear ring.

5. The processing technology of a low-VOC flame-retardant sponge for automobiles according to claim 1, characterized in that: In step S4, the formed sponge is automatically cured by placing it on a rack in the curing chamber. The rack consists of a first conveyor frame (19), a second conveyor frame (25), a lower support frame (22), an upper support plate (24), and a fixed walking assembly (31). There are three or more first conveyor frames arranged from top to bottom. Adjacent first conveyor frames are fixedly connected to each other by connecting columns (21). Several first conveyor rollers (20) are arranged from left to right in the first conveyor frame. The upper end of the first conveyor roller extends out of the first conveyor frame. The lower support frame is arranged on the left side of the lowest first conveyor frame. The lower support frame is horizontally arranged and integrated with the first conveyor frame on its right. The upper support plate is set directly above the lower support frame by a guide column (23). The lower end of the upper support plate is higher than the highest first conveyor frame. The second conveyor frame is horizontally connected to the lower support frame by a height adjustment mechanism. Between the body and the upper support plate, several second conveying rollers (26) are arranged sequentially from left to right in the second conveying frame. The upper end of the second conveying roller extends out of the second conveying frame. The second conveying roller matches the first conveying roller. The bottom of the lower first conveying frame and the bottom of the lower support frame are provided with fixed walking components. The fixed walking components are composed of support feet (31-2), hollow support columns (31-1), mounting plates (31-4), lifting cylinders, guide blocks, and walking wheels (31-3). The bottom of the lower first conveying frame and the bottom of the lower support frame are connected to support feet through hollow support columns. The lifting cylinder is installed in the lower end of the hollow support column. The output shaft end of the lifting cylinder is connected to the guide block that slides up and down in the hollow support column. The walking wheels are fixed to the bottom of the mounting plate. One end of the mounting plate extends into the hollow support column and is connected to the guide block. A through groove is opened on the side wall of the hollow support column for the mounting plate to extend into. The mounting plate can move up and down along the through groove.

6. The processing technology for a low-VOC flame-retardant sponge for automobiles according to claim 5, characterized in that: The height adjustment mechanism includes a second servo motor (30), a lead screw (28), and a connecting seat (29). The second servo motor is mounted on the top of the upper support plate. The output shaft of the second servo motor passes through the upper support plate and is connected to the upper end of the lead screw. The lead screw is placed vertically and its lower end is rotatably connected to the top of the lower support frame. The second conveying frame is slidably connected to the guide column through a guide cylinder set on the outer wall. The connecting seat is fixed on the outer wall of the second conveying frame. The second conveying frame is connected to the lead screw through the connecting seat. A threaded through hole matching the lead screw is opened between the upper and lower ends of the connecting seat. The lead screw passes through the connecting seat along the threaded through hole.

7. The processing technology of a low-VOC flame-retardant sponge for automobiles according to claim 1, characterized in that: A low-VOC flame-retardant automotive sponge produced using the above-mentioned processing technology specifically comprises the following components in parts by weight: 35-40 parts of polyether polyol A, 35-40 parts of polyether polyol B, 40-50 parts of PPG, 40-50 parts of diphenylmethane diisocyanate, 2-3 parts of foam stabilizer, 4-5 parts of foaming agent, 1-2 parts of flame retardant, 1-2 parts of catalyst, 0.5-1 part of chain extender, and 0.5-1 part of RGO / TiO2 nanoparticles. Polyether polyol A is a grafted polyether polyol, polyether polyol B is a highly active polyether polyol, the catalyst is one of tetramethyldisyltriamine and hydroxyethylpropylene diamine, and the flame retardant is 1-oxo-4-hydroxymethyl-2,6,7-trioxa-1-phosphabicyclo[2,2,2,]octane.

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