Production method of high-blackness graphite expandable polystyrene particles

Abstract

The invention relates to the technical field of production of high-blackness graphite expandable polystyrene particles, and discloses a production method of high-blackness graphite expandable polystyrene particles, which comprises the following steps: selecting a suitable reaction kettle or reaction container, ensuring that the container is clean and impurity-free, weighing raw materials and auxiliary materials, sequentially adding the raw materials, mixing the raw materials, and uniformly stirring to obtain the high-blackness graphite expandable polystyrene particles. And gradually raising the temperature in the reaction kettle under the condition that the mixing equipment continues to stir, adding an initiator to initiate a polymerization reaction of the styrene monomer when the temperature reaches a suitable range, and then carrying out low-temperature polymerization. According to the invention, graphite is added in the preparation method, so that the original thermal insulation effect of polystyrene is not weakened, but the thermal insulation effect is possibly enhanced due to unique properties of graphite, so that the high-blackness graphite expandable polystyrene particles can provide more excellent thermal insulation performance in the field of building materials, such as an external wall thermal insulation system and a roof thermal insulation layer; the energy consumption is effectively reduced, and the energy-saving efficiency of the building is improved.

Description

Technical Field

[0001] The invention relates to the technical field of production of high-blackness graphite expandable polystyrene particles, in particular to a production method of high-blackness graphite expandable polystyrene particles. Background Art

[0002] High-blackness graphite expandable polystyrene particles are a new type of material prepared by adding graphite additives to traditional expandable polystyrene through a special process. It not only retains the advantages of EPS materials such as light weight, impact resistance, heat insulation, and sound insulation, but also has higher blackness and special properties due to the addition of graphite. The addition of black additives such as graphite makes the product have a higher blackness, meeting the color requirements of specific fields. The addition of graphite does not affect the original thermal insulation properties of EPS materials, allowing it to achieve better energy-saving effects while maintaining its advantages such as light weight and impact resistance. The addition of graphite can also improve the flame retardant properties of the material, enabling it to better protect people and property safety in extreme situations such as fire. Depending on the specific production process and formula, high-blackness graphite expandable polystyrene particles may also have other properties such as anti-static and anti-aging. They have been widely used in many fields. They are used for building exterior wall insulation materials and sound insulation panels to improve the energy efficiency and comfort of buildings. They are also used in packaging materials for electronic products and precision instruments to protect products from external impact and damage. They can also be used for sound insulation and thermal insulation materials in the automotive manufacturing, aerospace and other fields.

[0003] As people's lives continue to change, the use of high-blackness graphite expandable polystyrene particles has become more and more common, so the production of high-blackness graphite expandable polystyrene particles has also become more and more common. However, the traditional production method results in the products produced not having good energy-saving efficiency, so a new preparation method is now proposed to solve this technical problem. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a method for producing high-blackness graphite expandable polystyrene particles, which has the advantages of good energy-saving efficiency and solves the problem that the traditional preparation method mentioned in the above background technology does not have good energy-saving efficiency.

[0006] (2) Technical solution

[0007] In order to achieve the purpose of having good energy-saving efficiency mentioned in the above background technology, the present invention provides the following technical solution: a method for producing high-blackness graphite expandable polystyrene particles, comprising the following steps:

[0008] Step 1: Select a suitable reactor or reaction vessel and ensure that the vessel is clean and free of impurities;

[0009] Step 2: weigh the raw materials and auxiliary materials, add the raw materials in sequence, and mix the raw materials;

[0010] Step 3: While the mixing equipment continues to stir, gradually increase the temperature in the reactor;

[0011] Step 4: When the temperature reaches a suitable range, an initiator is added to initiate the polymerization reaction of the styrene monomer, and then low-temperature polymerization is carried out;

[0012] Step 5: After the polymerization reaction is completed, the temperature in the reactor is gradually lowered by controlling the temperature;

[0013] Step 6: Discharge the cooled polymer particles from the reactor;

[0014] Step 7: Wash the initially obtained particles with an appropriate amount of water, dehydrate the washed particles, and then dry, sieve and package them.

[0015] Preferably, when selecting a reactor or reaction vessel suitable for the production of high-blackness graphite expandable polystyrene particles, it is necessary to ensure the volume and specifications, material and internal parts, structure and form, stirring and mixing, heating and cooling, and clean and maintain the reaction vessel.

[0016] Volume and specifications: Select a reactor with appropriate volume based on production scale and product requirements, and ensure that the reactor design meets safety production requirements and has sufficient strength and stability;

[0017] Materials and internal parts: Since corrosive substances may be involved in the production process, the material of the reactor should be stainless steel or high boron glass, corrosion-resistant materials. Internal parts such as stirring blades, jackets, support plates, shaft seals, etc. should also be made of corrosion-resistant materials to ensure long-term stable operation;

[0018] Structure and form: Choose a vertical or horizontal structure according to the production process. For production processes with an operating pressure of less than 0.5MPa, both vertical and horizontal structures are acceptable. If the operating pressure is higher, a horizontally installed structure may be more stable. Considering that the material viscosity may be high and prone to crystallization, the reactor should be equipped with stirring blades to ensure that the material is fully mixed and evenly dispersed;

[0019] Agitation and mixing: The design of the agitator blades should ensure that the materials are fully mixed in the reactor. Multiple layers of agitator blades can be used. The number, diameter, blade width, blade bending angle, and rotation speed of each layer of blades should be optimized according to production requirements. The agitator blades should be able to generate sufficient shearing action to fully stir the materials deposited at the bottom of the reactor to avoid dead zones.

[0020] Heating and cooling: The reactor should be equipped with an effective heating and cooling system to control the temperature during the reaction process. Jacket heating or steam heating can be used, and a cooling water system should be equipped to control the reaction temperature.

[0021] Cleaning method: Before production, the reactor or reaction vessel should be thoroughly cleaned to remove residues and impurities. The cleaning method can be mechanical cleaning, chemical cleaning or ultrasonic cleaning. After cleaning, rinse with distilled water to ensure that there is no residual chemical cleaning agent in the container;

[0022] Daily maintenance: During the production process, the cleanliness and integrity of the reactor or reaction vessel should be checked regularly to avoid corrosive or solid materials from remaining in the container for a long time to avoid damage to the container. Regular maintenance and care should be performed on the container, such as replacing worn stirring blades, and checking the jacket and shaft seal device.

[0023] Preferably, weighing the raw materials and the pavement, and sequentially adding the raw materials for mixing is a key step, and is divided into preparation and weighing of the raw materials and auxiliary materials, sequential addition of the raw materials, mixing of the raw materials, and subsequent processing.

[0024] Preparation and weighing of raw materials and auxiliary materials: Identify all raw materials and auxiliary materials required for production, including polystyrene base resin, graphite powder, foaming agent, stabilizer, and plasticizer. Use a precise electronic scale or balance to accurately weigh each raw material and auxiliary material according to the formula ratio. Ensure that the weighing process is not disturbed by external factors such as wind and vibration to ensure accurate weighing.

[0025] Sequential addition of raw materials: The order of adding raw materials should be determined according to the production process and the properties of the raw materials. Generally, the base resin is added first, followed by graphite powder, foaming agent, stabilizer, and plasticizer. When adding each raw material, ensure that the previous raw material has been fully dispersed in the mixing equipment. When adding raw materials, avoid splashing or flying to avoid waste or pollution. For raw materials that are prone to dust, such as graphite powder, you can pour them slowly or use dust collection equipment to reduce dust;

[0026] Mixing of raw materials: Select suitable mixing equipment, such as high-speed mixers and screw extruders, to ensure that the raw materials can be fully mixed and evenly mixed. The selection of mixing equipment should take into account factors such as the nature of the raw materials, production scale and mixing efficiency. Start the mixing equipment and mix the raw materials thoroughly. The mixing time should be determined according to the nature of the raw materials and the efficiency of the mixing equipment to ensure that the raw materials are evenly dispersed. During the mixing process, the speed or stirring mode of the mixing equipment can be adjusted in time to improve the mixing efficiency. After the mixing is completed, the quality of the mixture should be checked, such as observing the color, uniformity, and feel to ensure that the mixing quality meets the production requirements.

[0027] Preferably, the step of gradually increasing the temperature in the reactor while the mixing equipment continues to stir is further divided into preliminary preparation, mixing process, temperature increasing process and subsequent treatment.

[0028] Preliminary preparation: Ensure that all raw materials, including polystyrene base resin, graphite powder, foaming agent, and additives, are ready and their quality meets production requirements. Graphite powder should be finely ground to ensure its uniform dispersion in polystyrene. Check the integrity of the mixing equipment and reactor to ensure there are no leaks or damage. Confirm that the temperature control system, stirring system, and feeding system are in normal working condition.

[0029] Mixing process: According to the production formula, first put the polystyrene base resin into the mixing equipment, then add the graphite powder, ensuring that it is evenly dispersed during the mixing process, and finally add the foaming agent and additives. Continue stirring until the mixture is evenly mixed. Set an appropriate stirring speed to ensure that the raw materials can be fully mixed and that heat is not generated due to excessive stirring, resulting in local overheating. The stirring time should be determined according to the properties of the raw materials and the formula requirements to ensure uniform mixing;

[0030] Heating process: While the mixing equipment continues to stir, gradually increase the temperature in the reactor. The rate of temperature increase should be controlled within a reasonable range to avoid decomposition or side reactions of the raw materials due to excessive heating. Use a temperature sensor to monitor the temperature in the reactor in real time to ensure that the temperature is controlled within the set range. If the temperature rises or falls abnormally, adjust the heating or cooling system in time. As the temperature rises, the foaming agent begins to decompose and produce gas, causing the polystyrene particles to expand. The foaming situation should be closely observed and the temperature or stirring speed should be adjusted to control the degree of foaming.

[0031] Subsequent processing: After the foaming is completed, the temperature in the reactor is gradually lowered to room temperature or lower to solidify the polystyrene particles. Stirring should continue during the cooling process to avoid particle adhesion or agglomeration. The solidified polystyrene particles are screened to remove impurities and unqualified particles. The qualified particles are packaged and stored in a dry, ventilated warehouse.

[0032] Preferably, when the temperature reaches the appropriate range, the initiator is added to initiate the polymerization reaction of the styrene monomer, and then low-temperature polymerization is carried out. The reactor, stirring equipment, temperature control system, and feeding system are checked, and it is confirmed that all instruments are in normal working condition. Then, temperature control and initiator are performed, and finally the polymerization reaction and subsequent treatment are started.

[0033] Temperature adjustment and initiator addition: gradually increase the temperature in the reactor to an appropriate range. This temperature range is usually determined by the activity of the initiator and the polymerization characteristics of the styrene monomer. The temperature control must be precise to avoid adverse effects of excessively high or low temperatures on the polymerization reaction. When the temperature reaches the appropriate range, add the initiator according to the formula requirements. The amount of initiator added must be accurate. Too much or too little may affect the polymerization reaction speed and the properties of the product.

[0034] Polymerization reaction: After the initiator is added, the polymerization reaction of styrene monomer begins. During the polymerization reaction, the changes in the reactor, such as temperature and pressure, should be closely observed. After the polymerization reaction has been carried out for a period of time, in order to control the polymerization rate and the molecular weight of the product, it may be necessary to lower the temperature in the reactor and perform low-temperature polymerization, which helps to obtain a more stable polymer structure and better product performance. The time and temperature of low-temperature polymerization should be determined according to specific production requirements and experimental results;

[0035] Subsequent processing: When the polymerization reaction reaches a predetermined level, a terminator is added to stop the reaction. The amount of terminator added must be accurate to ensure that the reaction is completely stopped. The product after polymerization is degassed to remove unreacted monomers and possible volatile substances, and then dried to remove moisture from the product. If expandable polystyrene particles need to be produced, a foaming agent can be added to the dried product and foamed. The foamed product can be cut, screened, and other molding processes to obtain the final EPS particle product.

[0036] Preferably, after the polymerization reaction is completed, the temperature in the reactor is gradually lowered by controlling the temperature. First, the reaction is confirmed to be complete and heating and stirring are stopped, the temperature in the reactor is gradually lowered, and degassing, drying, molding and cutting are performed.

[0037] Confirmation of reaction completion: Confirmation of polymerization completion is achieved by observing the temperature and pressure changes in the reactor and by sampling and testing the properties of the polymer.

[0038] Stop heating and stirring: Once the polymerization reaction is confirmed to be complete, the heating equipment should be stopped immediately and the stirring speed should be appropriately reduced to reduce energy consumption and avoid excessive shearing of the polymer;

[0039] Gradually reduce the temperature inside the reactor: Use temperature control equipment to control the temperature inside the reactor. These devices are usually connected to the reactor through a jacket or internal coil. Circulating coolant removes heat from the reactor, gradually reducing the temperature inside the reactor to avoid sudden temperature drops that may cause stress or cracks in the polymer. The temperature reduction rate should be determined according to the properties of the polymer and production requirements, and is usually controlled within the range of a few to more than ten degrees per hour. During the temperature reduction process, the stirring speed should be maintained appropriately to ensure that the polymer is cooled evenly in the reactor to avoid local overheating or overcooling.

[0040] Degassing: When the temperature in the reactor drops to an appropriate range, degassing can be performed to remove unreacted monomers, low molecular weight polymers, and volatile substances, which helps to improve the purity and stability of the product;

[0041] Drying: The polymer is dried to remove moisture and other volatile substances. The drying process can be carried out in a vacuum drying oven, hot air dryer or fluidized bed dryer. The drying temperature and time should be determined according to the properties of the polymer and production requirements;

[0042] Molding and cutting: If expandable polystyrene particles need to be produced, the dried polymer can be foamed and then formed into the required particle shape and size through molding and cutting equipment.

[0043] Preferably, the discharging of the cooled polymer particles from the reactor requires preparation of receiving equipment, opening of a discharge valve, control of the discharge speed, collection and storage, and subsequent processing.

[0044] Prepare receiving equipment: Before discharging polymer particles, prepare receiving equipment such as hoppers, conveyor belts or storage tanks to collect the discharged polymer particles and carry out subsequent processing;

[0045] Open the discharge valve: When the polymer particles have cooled to a suitable temperature, open the discharge valve at the bottom of the reactor to allow the polymer particles to flow out naturally under the action of gravity;

[0046] Control the discharge speed: During the discharge process, the discharge speed should be properly controlled to avoid blockage or damage to the receiving equipment due to excessive flow of polymer particles;

[0047] Collection and storage: The discharged polymer particles are collected into the receiving equipment and subjected to necessary screening and grading treatment to remove impurities and particles that do not meet the requirements. Then, the qualified polymer particles are stored in a dry, ventilated, light-proof warehouse to prevent moisture, deterioration or contamination;

[0048] Subsequent processing: The polymer particles still contain a certain amount of water or other volatile substances when discharged, and can be dried to further improve the purity and stability of the product. The dried polymer particles are then foamed. The foaming process can be carried out in a dedicated foaming equipment, and the polymer particles are expanded into the desired shape and size by heating and pressurizing.

[0049] Preferably, the initially obtained particles are washed with an appropriate amount of water, and the washed particles are dehydrated, dried, sieved and packaged.

[0050] Dehydration treatment: Dehydration treatment is to remove moisture from the surface of polystyrene particles in order to proceed to the subsequent drying step. Common dehydration methods include centrifugal dehydration and pressing dehydration;

[0051] Centrifugal dehydration uses the centrifugal force generated by the centrifuge to remove the water on the surface of the particles, while compression dehydration uses mechanical pressure to squeeze out the water on the surface of the particles.

[0052] The drying step is to remove moisture from the polystyrene particles and improve the purity and stability of the product. Common drying methods include air flow drying, vacuum drying and oven drying.

[0053] Airflow drying uses hot or cold air to pass through the surface of the particles to remove the moisture inside them;

[0054] Vacuum drying is drying under low pressure environment, which can accelerate the evaporation of water;

[0055] Oven drying is to put the particles into an oven and dry them under controlled temperature and humidity conditions;

[0056] The screening step is to remove unqualified products from the polystyrene particles, such as oversized or undersized particles, agglomerated particles or impurities. The dried polystyrene particles are screened using screening equipment. According to the product specifications, the appropriate screen aperture is selected for screening, and the screened products are packaged.

[0057] Compared with the prior art, the present invention provides a method for producing high-blackness graphite expandable polystyrene particles, which has the following beneficial effects:

[0058] 1. In the present invention, the addition of graphite in the preparation method does not weaken the original thermal insulation effect of polystyrene. On the contrary, it may be enhanced due to the unique properties of graphite. This enables the high-blackness graphite expandable polystyrene particles to provide better thermal insulation performance in the field of building materials, such as exterior wall insulation systems and roof insulation layers, effectively reducing energy consumption and improving the energy-saving efficiency of buildings.

[0059] 2. In the present invention, graphite has a certain flame retardancy, so the high-blackness graphite expandable polystyrene particles have better flame retardancy than ordinary graphite expandable polystyrene particles. In extreme cases such as fire, it can slow the spread of fire, buy more time for personnel evacuation and fire rescue, and thus ensure the safety of people and property.

[0060] 3. In the present invention, polystyrene itself is a lightweight material that is easy to process and shape. The high-blackness graphite expandable polystyrene particles retain this property, making it more convenient to transport, install and use, and reducing construction difficulty and cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0063] See also Figure 1 A method for producing high-blackness graphite expandable polystyrene particles, characterized by comprising the following steps:

[0064] Step 1: Select a suitable reactor or reaction vessel and ensure that the vessel is clean and free of impurities;

[0065] Step 2: weigh the raw materials and auxiliary materials, add the raw materials in sequence, and mix the raw materials;

[0066] Step 3: While the mixing equipment continues to stir, gradually increase the temperature in the reactor;

[0067] Step 4: When the temperature reaches a suitable range, an initiator is added to initiate the polymerization reaction of the styrene monomer, and then low-temperature polymerization is carried out;

[0068] Step 5: After the polymerization reaction is completed, the temperature in the reactor is gradually lowered by controlling the temperature;

[0069] Step 6: Discharge the cooled polymer particles from the reactor;

[0070] Step 7: Wash the initially obtained particles with an appropriate amount of water, dehydrate the washed particles, and then dry, sieve and package them.

[0071] Specifically, such as Figure 1As shown, when selecting a reactor or reaction vessel suitable for the production of high-blackness graphite expandable polystyrene particles, it is necessary to ensure the volume and specifications, material and internal parts, structure and form, stirring and mixing, heating and cooling, and clean and maintain the reaction vessel.

[0072] Through the above technical solutions, volume and specifications: according to the production scale and product requirements, select the reactor with appropriate volume, and ensure that the design of the reactor meets the safety production requirements and has sufficient strength and stability;

[0073] Materials and internal parts: Since corrosive substances may be involved in the production process, the material of the reactor should be stainless steel or high boron glass, corrosion-resistant materials. Internal parts such as stirring blades, jackets, support plates, shaft seals, etc. should also be made of corrosion-resistant materials to ensure long-term stable operation;

[0074] Structure and form: Choose a vertical or horizontal structure according to the production process. For production processes with an operating pressure of less than 0.5MPa, both vertical and horizontal structures are acceptable. If the operating pressure is higher, a horizontally installed structure may be more stable. Considering that the material viscosity may be high and prone to crystallization, the reactor should be equipped with stirring blades to ensure that the material is fully mixed and evenly dispersed;

[0075] Agitation and mixing: The design of the agitator blades should ensure that the materials are fully mixed in the reactor. Multiple layers of agitator blades can be used. The number, diameter, blade width, blade bending angle, and rotation speed of each layer of blades should be optimized according to production requirements. The agitator blades should be able to generate sufficient shearing action to fully stir the materials deposited at the bottom of the reactor to avoid dead zones.

[0076] Heating and cooling: The reactor should be equipped with an effective heating and cooling system to control the temperature during the reaction process. Jacket heating or steam heating can be used, and a cooling water system should be equipped to control the reaction temperature.

[0077] Cleaning method: Before production, the reactor or reaction vessel should be thoroughly cleaned to remove residues and impurities. The cleaning method can be mechanical cleaning, chemical cleaning or ultrasonic cleaning. After cleaning, rinse with distilled water to ensure that there is no residual chemical cleaning agent in the container;

[0078] Daily maintenance: During the production process, the cleanliness and integrity of the reactor or reaction vessel should be checked regularly to avoid corrosive or solid materials from remaining in the container for a long time to avoid damage to the container. Regular maintenance and care should be performed on the container, such as replacing worn stirring blades, and checking the jacket and shaft seal device.

[0079] Specifically, such as Figure 1As shown, weighing the raw materials and the auxiliary materials, and adding the raw materials in sequence for mixing is a key step, and is divided into the preparation and weighing of the raw materials and auxiliary materials, the sequential addition of the raw materials, the mixing of the raw materials and subsequent processing.

[0080] Through the above technical solution, the preparation and weighing of raw materials and auxiliary materials: clearly identify all raw materials and auxiliary materials required for production, including polystyrene base resin, graphite powder, foaming agent, stabilizer, plasticizer, and use accurate electronic scales or balances to accurately weigh the weight of each raw material and auxiliary material according to the formula ratio, ensuring that the weighing process is not disturbed by external factors such as wind and vibration to ensure the accuracy of the weighing;

[0081] Sequential addition of raw materials: The order of adding raw materials should be determined according to the production process and the properties of the raw materials. Generally, the base resin is added first, followed by graphite powder, foaming agent, stabilizer, and plasticizer. When adding each raw material, ensure that the previous raw material has been fully dispersed in the mixing equipment. When adding raw materials, avoid splashing or flying to avoid waste or pollution. For raw materials that are prone to dust, such as graphite powder, you can pour them slowly or use dust collection equipment to reduce dust;

[0082] Mixing of raw materials: Select suitable mixing equipment, such as high-speed mixers and screw extruders, to ensure that the raw materials can be fully mixed and evenly mixed. The selection of mixing equipment should take into account factors such as the nature of the raw materials, production scale and mixing efficiency. Start the mixing equipment and mix the raw materials thoroughly. The mixing time should be determined according to the nature of the raw materials and the efficiency of the mixing equipment to ensure that the raw materials are evenly dispersed. During the mixing process, the speed or stirring mode of the mixing equipment can be adjusted in time to improve the mixing efficiency. After the mixing is completed, the quality of the mixture should be checked, such as observing the color, uniformity, and feel to ensure that the mixing quality meets the production requirements.

[0083] Specifically, such as Figure 1 As shown, the process of gradually increasing the temperature in the reactor while the mixing equipment continues to stir is divided into preliminary preparation, mixing process, temperature rising process and subsequent treatment.

[0084] Using the above technical solution, preliminary preparations include: ensuring that all raw materials, including polystyrene base resin, graphite powder, foaming agent, and additives, are ready and of quality that meets production requirements. Graphite powder should be finely ground to ensure its uniform dispersion in the polystyrene. Check the integrity of the mixing equipment and reactor to ensure there are no leaks or damage. Confirm that the temperature control system, stirring system, and feeding system are in normal working condition.

[0085] Mixing process: According to the production formula, first put the polystyrene base resin into the mixing equipment, then add the graphite powder, ensuring that it is evenly dispersed during the mixing process, and finally add the foaming agent and additives. Continue stirring until the mixture is evenly mixed. Set an appropriate stirring speed to ensure that the raw materials can be fully mixed and that heat is not generated due to excessive stirring, resulting in local overheating. The stirring time should be determined according to the properties of the raw materials and the formula requirements to ensure uniform mixing;

[0086] Heating process: While the mixing equipment continues to stir, gradually increase the temperature in the reactor. The rate of temperature increase should be controlled within a reasonable range to avoid decomposition or side reactions of the raw materials due to excessive heating. Use a temperature sensor to monitor the temperature in the reactor in real time to ensure that the temperature is controlled within the set range. If the temperature rises or falls abnormally, adjust the heating or cooling system in time. As the temperature rises, the foaming agent begins to decompose and produce gas, causing the polystyrene particles to expand. The foaming situation should be closely observed and the temperature or stirring speed should be adjusted to control the degree of foaming.

[0087] Subsequent processing: After the foaming is completed, the temperature in the reactor is gradually lowered to room temperature or lower to solidify the polystyrene particles. Stirring should continue during the cooling process to avoid particle adhesion or agglomeration. The solidified polystyrene particles are screened to remove impurities and unqualified particles. The qualified particles are packaged and stored in a dry, ventilated warehouse.

[0088] Specifically, such as Figure 1 As shown, when the temperature reaches the appropriate range, the initiator is added to initiate the polymerization reaction of the styrene monomer, and then low-temperature polymerization is carried out. The reactor, stirring equipment, temperature control system, and feeding system are checked, and it is confirmed that all instruments are in normal working condition. Then, the temperature is controlled and the initiator is added, and finally the polymerization reaction and subsequent treatment are started.

[0089] Through the above technical solution, temperature adjustment and initiator addition: gradually increase the temperature in the reactor to an appropriate range. This temperature range is usually determined based on the activity of the initiator and the polymerization characteristics of the styrene monomer. The temperature control must be precise to avoid adverse effects of excessively high or low temperatures on the polymerization reaction. When the temperature reaches the appropriate range, the initiator is added according to the formula requirements. The amount of initiator added must be accurate. Too much or too little may affect the speed of the polymerization reaction and the properties of the product.

[0090] Polymerization reaction: After the initiator is added, the polymerization reaction of styrene monomer begins. During the polymerization reaction, the changes in the reactor, such as temperature and pressure, should be closely observed. After the polymerization reaction has been carried out for a period of time, in order to control the polymerization rate and the molecular weight of the product, it may be necessary to lower the temperature in the reactor and perform low-temperature polymerization, which helps to obtain a more stable polymer structure and better product performance. The time and temperature of low-temperature polymerization should be determined according to specific production requirements and experimental results;

[0091] Subsequent processing: When the polymerization reaction reaches a predetermined level, a terminator is added to stop the reaction. The amount of terminator added must be accurate to ensure that the reaction is completely stopped. The product after polymerization is degassed to remove unreacted monomers and possible volatile substances, and then dried to remove moisture from the product. If expandable polystyrene particles need to be produced, a foaming agent can be added to the dried product and foamed. The foamed product can be cut, screened, and other molding processes to obtain the final EPS particle product.

[0092] Specifically, such as Figure 1 As shown, after the polymerization reaction is completed, the temperature in the reactor is gradually lowered by controlling the temperature. First, confirm that the reaction is completed and stop heating and stirring, gradually lower the temperature in the reactor, and perform degassing, drying, molding and cutting.

[0093] The completion of the reaction is confirmed by observing the temperature and pressure changes in the reactor and sampling and testing the properties of the polymer to confirm whether the polymerization reaction has been completed.

[0094] Stop heating and stirring: Once the polymerization reaction is confirmed to be complete, the heating equipment should be stopped immediately and the stirring speed should be appropriately reduced to reduce energy consumption and avoid excessive shearing of the polymer;

[0095] Gradually reduce the temperature inside the reactor: Use temperature control equipment to control the temperature inside the reactor. These devices are usually connected to the reactor through a jacket or internal coil. Circulating coolant removes heat from the reactor, gradually reducing the temperature inside the reactor to avoid sudden temperature drops that may cause stress or cracks in the polymer. The temperature reduction rate should be determined according to the properties of the polymer and production requirements, and is usually controlled within the range of a few to more than ten degrees per hour. During the temperature reduction process, the stirring speed should be maintained appropriately to ensure that the polymer is cooled evenly in the reactor to avoid local overheating or overcooling.

[0096] Degassing: When the temperature in the reactor drops to an appropriate range, degassing can be performed to remove unreacted monomers, low molecular weight polymers, and volatile substances, which helps to improve the purity and stability of the product;

[0097] Drying: The polymer is dried to remove moisture and other volatile substances. The drying process can be carried out in a vacuum drying oven, hot air dryer or fluidized bed dryer. The drying temperature and time should be determined according to the properties of the polymer and production requirements;

[0098] Molding and cutting: If expandable polystyrene particles need to be produced, the dried polymer can be foamed and then formed into the required particle shape and size through molding and cutting equipment.

[0099] Specifically, such as Figure 1 As shown, the cooled polymer particles are discharged from the reactor, which requires preparation of receiving equipment, opening of the discharge valve, control of the discharge speed, collection and storage, and subsequent processing.

[0100] Prepare receiving equipment through the above technical solution: Before discharging the polymer particles, prepare receiving equipment, such as a hopper, conveyor belt or storage tank, so as to collect the discharged polymer particles and subsequently process them;

[0101] Open the discharge valve: When the polymer particles have cooled to a suitable temperature, open the discharge valve at the bottom of the reactor to allow the polymer particles to flow out naturally under the action of gravity;

[0102] Control the discharge speed: During the discharge process, the discharge speed should be properly controlled to avoid blockage or damage to the receiving equipment due to excessive flow of polymer particles;

[0103] Collection and storage: The discharged polymer particles are collected into the receiving equipment and subjected to necessary screening and grading treatment to remove impurities and particles that do not meet the requirements. Then, the qualified polymer particles are stored in a dry, ventilated, light-proof warehouse to prevent moisture, deterioration or contamination;

[0104] Subsequent processing: The polymer particles still contain a certain amount of water or other volatile substances when discharged, and can be dried to further improve the purity and stability of the product. The dried polymer particles are then foamed. The foaming process can be carried out in a dedicated foaming equipment, and the polymer particles are expanded into the desired shape and size by heating and pressurizing.

[0105] Specifically, such as Figure 1 As shown, the initially obtained particles are washed with an appropriate amount of water, the washed particles are dehydrated, dried, sieved and packaged.

[0106] Through the above technical solution, dehydration treatment: dehydration treatment is to remove moisture from the surface of polystyrene particles so as to facilitate the subsequent drying step. Common dehydration methods include centrifugal dehydration and pressing dehydration;

[0107] Centrifugal dehydration uses the centrifugal force generated by the centrifuge to remove the water on the surface of the particles, while compression dehydration uses mechanical pressure to squeeze out the water on the surface of the particles.

[0108] The drying step is to remove moisture from the polystyrene particles and improve the purity and stability of the product. Common drying methods include air flow drying, vacuum drying and oven drying.

[0109] Airflow drying uses hot or cold air to pass through the surface of the particles to remove the moisture inside them;

[0110] Vacuum drying is drying under low pressure environment, which can accelerate the evaporation of water;

[0111] Oven drying is to put the particles into an oven and dry them under controlled temperature and humidity conditions;

[0112] The screening step is to remove unqualified products from the polystyrene particles, such as oversized or undersized particles, agglomerated particles or impurities. The dried polystyrene particles are screened using screening equipment. According to the product specifications, the appropriate screen aperture is selected for screening, and the screened products are packaged.

[0113] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A method for producing high-blackness graphite expandable polystyrene particles, characterized in that: The following steps are involved: Step 1: Select a suitable reactor or reaction vessel and ensure that the vessel is clean and free of impurities; Step 2: weigh the raw materials and auxiliary materials, add the raw materials in sequence, and mix the raw materials; Step 3: While the mixing equipment continues to stir, gradually increase the temperature in the reactor; Step 4: When the temperature reaches a suitable range, an initiator is added to initiate the polymerization reaction of the styrene monomer, and then low-temperature polymerization is carried out; Step 5: After the polymerization reaction is completed, the temperature in the reactor is gradually lowered by controlling the temperature; Step 6: Discharge the cooled polymer particles from the reactor; Step 7: Wash the initially obtained particles with an appropriate amount of water, dehydrate the washed particles, and then dry, sieve and package them.

2. The method for producing high-blackness graphite expandable polystyrene particles according to claim 1, wherein: When selecting a reactor or reaction vessel suitable for the production of high-blackness graphite expandable polystyrene particles, it is necessary to ensure the volume and specifications, material and internal parts, structure and form, stirring and mixing, heating and cooling, and clean and maintain the reaction vessel.

3. The method for producing high-blackness graphite expandable polystyrene particles according to claim 1, wherein: The weighing of raw materials and auxiliary materials, and the sequential addition of raw materials for mixing is a key step, and is divided into the preparation and weighing of raw materials and auxiliary materials, the sequential addition of raw materials, the mixing of raw materials and subsequent processing.

4. The method for producing high-blackness graphite expandable polystyrene particles according to claim 1, wherein: The process of gradually increasing the temperature in the reactor while the mixing equipment continues to stir is divided into preliminary preparation, mixing process, temperature increasing process and subsequent treatment.

5. The method for producing high-blackness graphite expandable polystyrene particles according to claim 1, wherein: When the temperature reaches the appropriate range, the initiator is added to initiate the polymerization reaction of the styrene monomer, and then low-temperature polymerization is carried out. The reactor, stirring equipment, temperature control system, and feeding system are checked, and it is confirmed that all instruments are in normal working condition. Then, the temperature is controlled and the initiator is added, and finally the polymerization reaction and subsequent treatment are started.

6. The method for producing high-blackness graphite expandable polystyrene particles according to claim 1, wherein: After the polymerization reaction is completed, the temperature in the reactor is gradually lowered by controlling the temperature. First, confirm that the reaction is complete and stop heating and stirring, gradually lower the temperature in the reactor, and perform degassing, drying, molding and cutting.

7. The method for producing high-blackness graphite expandable polystyrene particles according to claim 1, wherein: Discharging the cooled polymer particles from the reactor requires preparing receiving equipment, opening a discharge valve, controlling the discharge rate, collecting and storing the particles, and performing subsequent processing.

8. The method for producing high-blackness graphite expandable polystyrene particles according to claim 1, wherein: The initially obtained particles are washed with an appropriate amount of water, and the washed particles are dehydrated, dried, sieved and packaged.

Images