Thermal conductivity of plastics Special engineering plastics have been widely used in many fields due to their unique performance advantages. Among them, thermal conductivity, as a key indicator to measure the thermal conductivity of materials, has a significant impact on the practical application of special engineering plastics. PEEK is highly favored in aerospace, automotive manufacturing, electronics and other fields due to its excellent comprehensive performance. The thermal conductivity of unmodified PEEK is generally between 0.25-0.35W/(m · K), with mediocre performance in terms of thermal conductivity. However, when modified with fillers such as boron nitride and silicon carbide, its thermal conductivity can be significantly increased to 1.5-5W/(m · K), and even exceed 10W/(m · K) under specific conditions. In the manufacturing of aircraft engine components, high thermal conductivity modified PEEK materials can effectively dissipate heat, reduce component temperature, and improve engine efficiency and reliability. Polyetherimide (PEI) is a high-performance thermoplastic engineering plastic with outstanding high temperature resistance, high strength, and dimensional stability. The thermal conductivity of unmodified PEI is usually between 0.2-0.3W/(m · K). By adding high thermal conductivity carbon fibers, graphene nanosheets, etc. for modification, the thermal conductivity can be increased to 2-6W/(m · K). In the field of electronic appliances, such as the heat dissipation module of laptops, modified PEI material can be used to manufacture heat dissipation frames, which can efficiently conduct heat and ensure stable operation of electronic devices. Polyphenylene sulfide (PPS) has good chemical stability and mechanical properties, with an unmodified thermal conductivity of approximately 0.2-0.3W/(m · K). After modification with fillers such as alumina and aluminum nitride, the thermal conductivity of PPS can be increased to 1-3W/(m · K), and further improved to 3-8W/(m · K) when modified with carbon nanotubes. In chemical equipment, high thermal conductivity modified PPS materials can be used to manufacture heat exchanger components, improve heat exchange efficiency, and reduce energy consumption. Polyphenylsulfone resin (PPSU) is an amorphous thermoplastic with high transparency and hydrolytic stability. The thermal conductivity of unmodified PPSU is around 0.2-0.25W/(m · K). Polysulfone (PSU) is a slightly amber colored amorphous transparent or semi transparent polymer with excellent heat resistance, water resistance, and insulation properties. The thermal conductivity of unmodified PSU is approximately 0.22-0.3W/(m · K).  widely used in transformers, high-voltage switches and other equipment to ensure timely heat dissipation during operation and good insulation performance. The thermal conductivity of special engineering plastics has been significantly improved after modification, which not only broadens their application range under harsh conditions such as high temperature and high power, but also promotes technological progress in related fields. With the continuous development of materials science, it is expected that special engineering plastics and their modified materials with better thermal conductivity and comprehensive performance will be developed in the future, providing strong support for innovative development in more fields.

what is peek? PEEK is a high-performance special engineering plastic. The following is a detailed introduction to it:1.PEEK Basic Information-Chemical Structure: The main chain of PEEK contains a large number of ether and ketone bonds, which endows it with excellent properties due to its unique chemical structure-Appearance: Generally white or beige powder or granular substance.2.Performance characteristics- Mechanical performance : It has excellent strength and rigidity, with a tensile strength of over 90MPa, as well as good toughness and impact resistance, comparable to some metal materials. For example, in the aerospace industry, components made of PEEK can withstand large mechanical loads.- Thermal performance : Outstanding high temperature resistance, with long-term use temperatures up to 260 ℃ and short-term use temperatures up to 300 ℃, while maintaining good mechanical properties and dimensional stability at high temperatures. The glass transition temperature is around 150 ℃, the melting point is about 341 ℃, and the hot deformation temperature is also relatively high, such as the hot deformation temperature HDT-A of 162 ℃-Chemical stability: It has excellent tolerance to various organic solvents, oils, weak acids, and weak bases, and can maintain strength over a wide temperature range and concentration, without easily changing color, expanding, or cracking. Only a few highly corrosive substances such as concentrated sulfuric acid can have an impact on it-Wear resistance and self-lubricating properties: With a low coefficient of friction, it has good self-lubricating performance and can achieve oil-free lubrication work. It has excellent wear resistance in many harsh application environments such as high temperature, high load, and strong corrosion. Therefore, it is often used to manufacture components such as gears and bearings that require wear resistance and low friction- Hydrolysis resistance : PEEK products can still work continuously for thousands of hours without significant performance degradation when immersed in steam at temperatures exceeding 250 ℃ or in high-pressure water, which gives them unique advantages in some humid or high-temperature steam environments-Flame retardancy: Without the use of any additives, the flammability level of the 1.45mm thick PEEK sample is UL94 V-0, which has good flame retardancy. The smoke and toxic gas emissions during combustion are particularly low, improving safety during use-Electrical Performance: It can maintain stable and excellent electrical performance over a wide range of temperatures and frequencies, making it suitable for the manufacturing of high-performance insulation components in the electronic and electrical fields-Radiation resistance: It has extremely strong resistance to high-dose gamma ray radiation, and its mechanical properties can be fully preserved. It can be used as a radiation resistant component in nuclear equipment-Biocompatibility: It has good compatibility with the human body, no toxic side effects, and therefore has a wide range of applications in the field of medical devices, such as manufacturing artificial bones, dental descaling devices, endoscope parts, etc. 3.Processing performance-Injection molding: Injection molding technology can be used to directly process parts, but the molding temperature is relatively high, generally between 320 ℃ -390 ℃, and there are certain requirements for screw and other equipment. After the molding is completed, the screw needs to be quickly cleaned with PE wax to prevent material residue. - Mechanical processing : It can perform post-processing such as turning, milling, drilling, tapping, bonding, and ultrasonic welding, and can meet the manufacturing needs of various shapes and sizes of components.  4.Application of PEEK-Aerospace field: Used for manufacturing aircraft wings, fuselage structural components, engine parts, landing gear components, etc. It can replace traditional metal materials, reduce weight, and improve component performance and reliability-The automotive industry, including engine peripheral components, transmission components, steering components, bearings, gaskets, seals, clutch rings, etc., helps to achieve miniaturization, lightweighting, and improve the performance and service life of automobiles-In the field of electronics and electrical engineering, it is an ideal material for manufacturing semiconductor manufacturing equipment, electronic insulation films, wafer carriers, connecting devices, ultrapure water transport pipelines, valves, and pumps. It can meet the high-precision, high-performance, and high reliability requirements of materials in this field-In the field of medical devices, in addition to artificial bones, dental descaling devices, and endoscope parts, it can also be used to manufacture surgical instruments, implantable medical devices, medical device casings, etc. Its biocompatibility and sterilization resistance make it play an important role in the medical field-In the field of chemical engineering, it can be used to manufacture compressor valve plates, piston rings, seals, and various chemical pump bodies, valve components, etc. It can withstand various corrosive media and high temperature and high pressure environments in chemical production- Other fields : It is widely used in food processing, office machinery components, wire wrapping, fibers, plates, rods, and other fields, such as separation claws for copiers, special heat-resistant bearings, chains, gears, PEEK wrapped wires, industrial filter cloth, industrial brushes, etc

What are the advantages of high flow peek materials?High flow PEEK materials (polyetheretherketone materials with high melt index)The melt flow coefficient (MFR) of PEEK, also known as melt flow rate or melt flow index , is an indicator of the melt flowability of PEEKmaterial at a certain temperature and load. Our PEEK test by ISO 1133( 380℃,5kg),we have two types of high flow PEEK granules:one can reach 80g/10min,another one can reach 110g/10min.High flow PEEK materials have the following significant advantages:1, In terms of molding and processingAdvantages of injection moldingComplex parts are easier to form: High flow PEEK material can more smoothly fill the mold cavity during injection molding. For parts with thin walls, fine structures, or complex shapes, such as micro gears and small connectors in precision electronic devices, their melt can better replicate the details of the mold and reduce molding defects. For example, in the manufacturing of some small PEEK medical device components, high fluidity materials can ensure complete filling in narrow spaces, resulting in higher dimensional accuracy of the product and reduced defect rates.Shorten molding cycle: Due to its good fluidity, lower injection pressure and shorter injection time can be used during injection molding. This helps to accelerate the molding speed and improve production efficiency. Compared with ordinary PEEK materials, the molding cycle may be shortened by 20% -30%, which can effectively reduce production costs in large-scale production.Advantages of Extrusion Processing:High precision extruded products: In the extrusion process, high flow PEEK material can be uniformly passed through the die of the extruder, thereby producing pipes, rods, and profiles with high dimensional accuracy and good surface quality. For example, in the production of PEEK pipes, high fluidity can make the wall thickness of the pipe more uniform and the concentricity higher, which is beneficial for applications in fields that require strict dimensional accuracy, such as hydraulic system pipelines in aerospace.Adapt to multiple extrusion processes: This material can better adapt to complex extrusion processes such as co extrusion and multi-layer extrusion. By co extruding with other materials, composite products with multiple functions can be manufactured, such as composite pipes with high barrier materials on the inner layer and high mechanical performance PEEK on the outer layer, expanding the application range of PEEK materials.2, In terms of product performanceMechanical performance optimization:Fiber reinforcement effect is better: When high flow PEEK material is combined with fibers (such as carbon fiber, glass fiber), the fibers can be more evenly dispersed in the matrix material. This is because good fluidity helps the fibers to fully immerse in the melt, thereby more effectively exerting the reinforcing effect of the fibers. For example, adding 30% carbon fiber to high flow PEEK material can achieve a tensile strength of 200-250 MPa, which is about twice that of unreinforced materials, while maintaining good toughness.Reduce internal stress concentration:During the molding process, high fluidity can make the material flow more naturally in the mold, reducing the phenomenon of internal stress concentration caused by poor flow. This enables the molded product to distribute stress more evenly when subjected to external forces, improving its fatigue resistance and service life.Physical performance improvement:Excellent performance of thin-walled products: For thin-walled PEEK products, high flow materials can maintain the physical properties of the material while ensuring the thin-walled structure. For example, when manufacturing thin-walled electronic packaging shells, high flow PEEK materials can provide good barrier properties, chemical resistance, and mechanical properties, protecting internal electronic components from external environmental influences.Enhanced dimensional stability: Although high flow PEEK materials have good fluidity, they can still maintain good dimensional stability after molding. This is because its molecular chain structure can be better arranged during the processing, and its thermal expansion coefficient is lower in high temperature environments. The size change of the product is small when used for a long time, making it suitable for applications that require long-term stability in size accuracy, such as PEEK components in optical instruments.

PEEK injection molding——Requirements of injection molding equipment In the PEEK injection molding process, suitable injection molding equipment is the key to ensuring product quality and production efficiency. Due to the special physical and chemical properties of PEEK material, it has high and unique requirements for various aspects of injection molding equipment.Requirements for core components of injection molding machinesPEEK injection molding machines Screw designThe injection molding of PEEK material requires screws with special design. The length to diameter ratio (L/D) of the screw is generally between 20:1-24:1. A longer aspect ratio can provide sufficient plasticizing length for the material, allowing PEEK to be fully heated and mixed evenly in the barrel. The compression ratio is usually set between 2.5-3.5, which can effectively compress and shear the material, ensuring that PEEK material forms a good melt during the plasticization process to meet the requirements of injection molding.PEEK Material barrel temperature controlAccurate temperature control of the material barrel is crucial for PEEK injection molding. The temperature of the material barrel usually needs to be set at 360-390 ℃, and the temperature near the nozzle can be slightly lower, about 350-370 ℃, to prevent the material from solidifying prematurely at the nozzle. Due to the narrow processing temperature range of PEEK, the fluctuation range of temperature in each section of the barrel should be controlled within ± 5 ℃. Advanced temperature control system, equipped with high-precision thermocouples and intelligent temperature control instruments, can monitor and adjust the temperature of the material barrel in real time, ensuring that the material is always in the best melting state, guaranteeing the stability of the injection molding process and the consistency of product quality.Injection pressure and speed adjustment rangeInjection molding machines need to have sufficient injection pressure and a wide speed adjustment range. The injection pressure is generally between 100-140MPa to overcome the high melt viscosity of PEEK material and ensure that the material can quickly and completely fill the mold cavity. The adjustment of injection speed is crucial for products of different shapes and sizes. For example, thin-walled products require a high injection speed, usually around 50-100mm/s, to prevent defects such as short shots caused by rapid cooling of the melt during the filling process; For thick walled products, the injection speed can be controlled between 20-50mm/s to avoid problems such as trapped gas and internal stress concentration caused by excessive speed.Requirements for auxiliary equipmentdrying equipmentReliable drying equipment is essential to ensure that PEEK materials meet the water content standards before injection molding. The hot air circulation drying oven is a commonly used drying equipment that can dry materials in an environment of 150-180 ℃ for 3-4 hours, reducing the moisture content to below 0.02%. In addition, for some application scenarios that require extremely high moisture content, vacuum drying equipment can also be used to achieve efficient drying at lower temperatures, better protecting the performance of PEEK materials.Mold temperature control equipmentDue to the high mold temperature required for PEEK injection molding, generally between 160-190 ℃, the role of mold temperature control equipment should not be underestimated. Oil temperature machine or electric heating mold temperature controller can accurately stabilize the mold temperature within the required range. A stable mold temperature helps improve the crystallinity of the product, enhance its dimensional stability and mechanical properties, and reduce issues such as deformation and cracking caused by temperature fluctuations.Mold Temperature Machine Driven by waterIn summary, the requirements for PEEK injection molding equipment cover the core components of injection molding machines as well as various auxiliary equipment. Only by selecting equipment that meets the requirements and accurately setting and maintaining its parameters can high-quality PEEK injection molding production be achieved, meeting the growing market demand for PEEK products. In actual production, continuously optimizing equipment performance and process parameters is an important way to improve production efficiency and product quality.

PEEK Injection Molding - Drying and PreheatingIn the PEEK material injection molding process, pre-treatment before injection molding is a crucial step that plays a decisive role in the quality and performance of the final product.The necessity of peek preprocessingAlthough PEEK material has excellent performance, due to its high melting temperature and viscosity, its flowability is poor under conventional injection molding conditions, making it difficult to uniformly and fully fill complex mold cavities. Especially for injection molded products with fine structures, thin-walled features, or small pore sizes, ordinary injection molding processes are prone to problems such as insufficient filling and molding defects. Preprocessing aims to improve these conditions and enhance the processing performance of materials.If the product structure is very fine and the thickness is very thin, our high flow PEEK can be used. Under standard testing methods, the melt index can reach 110g/min, improving the integrity of the product.Dehumidification dryerDrying pretreatmentReason for drying:PEEK material hasPEEK material has hygroscopicity and will absorb moisture from the air during storage and transportation. When materials containing moisture enter the high-temperature injection molding environment, the moisture evaporates instantly, forming bubbles and voids inside the product, leaving defects such as silver threads and stripes on the surface of the product, seriously affecting the appearance and mechanical properties of the product.Drying process: Generally, PEEK materials are placed in a hot air circulation drying oven at 150-180 ℃ for 3-4 hours until the moisture content of the material decreases to below 0.02%. During the drying process, it is necessary to regularly flip the material to ensure that every part can be fully dried. In addition, vacuum drying can also be used to achieve efficient drying at lower temperatures, which is particularly suitable for special PEEK materials that are sensitive to temperature.The significance of product quality: After sufficient drying, PEEK material can be stably plasticized and flowed during the injection molding process, avoiding various quality problems caused by water vaporization. This not only improves the appearance quality of the product, but also enhances its mechanical properties such as strength and toughness, ensuring the reliability of the product in various harsh application scenarios.PEEK Preheating  Temperature setting basis: Preheat PEEK material to 160-180 ℃, this temperature range has been verified through extensive experiments and practices. Within this temperature range, it can effectively reduce the melt viscosity of the material, enhance the activity of molecular segments, and improve its fluidity, without causing thermal degradation or other irreversible chemical changes of the material due to high temperature. Once the temperature exceeds the appropriate range, it may cause material performance degradation, such as decreased mechanical properties, color changes, etc.Preheating Operation method:Usually, a hot air circulating oven is used for preheating treatment. Place the PEEK material evenly on the oven tray to ensure even heating of the material. During the preheating process, it is necessary to monitor the temperature inside the oven in real time to ensure that the temperature remains stable within the set range. At the same time, according to the thickness and quality of the material accumulation, the preheating time should be adjusted reasonably, usually 2-3 hours, to ensure that the material as a whole achieves the expected preheating effect.The impact on the injection molding process: PEEK materials that have been preheated and pre treated can achieve uniform plasticization faster after entering the injection molding machine barrel, shorten the plasticization cycle, and improve production efficiency. In the injection molding stage, better fluidity enables the material to quickly and completely fill every corner of the mold cavity, especially for thin-walled and complex structured products, effectively avoiding defects such as cold lines and missing materials caused by untimely filling, significantly improving the molding quality and dimensional accuracy of the product. In summary, the pre-treatment of PEEK material before injection molding has laid a solid foundation for the subsequent injection molding process through scientific preheating and drying processes, and is irreplaceable in improving the quality of injection molded products and meeting diverse industrial production needs. In actual production, each stage of pre-treatment should be strictly controlled, and pre-treatment parameters should be flexibly adjusted according to material characteristics and product requirements to achieve the best injection molding effect.

PEEK Injection Molding - Understanding Material CharacteristicsIn modern industrial manufacturing, PEEK (polyetheretherketone), as a high-performance engineering plastic, has demonstrated unique advantages in the injection molding field due to its excellent material properties. A deep understanding of these characteristics is crucial for optimizing PEEK injection molding processes and improving product quality.PEEK material has excellent thermal properties.Its melting point is as high as 334-343 ℃, and its glass transition temperature is about 143 ℃. This means that during the injection molding process, it needs to be heated to high temperatures to achieve good melting and flow conditions. At the same time, its long-term use temperature can reach around 260 ℃, and it can even withstand high temperatures of 300 ℃ in the short term. This excellent heat resistance enables PEEK injection molded products to work stably in extreme high temperature environments, and is widely used in the manufacturing of high-temperature components such as aerospace and automotive engines.In terms of mechanical performance, PEEK is considered outstanding. Its tensile strength can reach about 90-100MPa, and its bending strength is about 170-190MPa, possessing high strength and rigidity. At the same time, PEEK also has good toughness, high impact strength, and is not easily broken under external forces. This enables PEEK injection molded products to withstand significant mechanical stress, making them suitable for manufacturing mechanical parts that require extremely high strength and reliability, such as gears, shafts, etc.Chemical stability is also a prominent characteristic of PEEK materials. It has excellent tolerance to most chemical substances, including common organic solvents, acids, bases, etc. During the injection molding process, this characteristic ensures that the material will not experience performance degradation due to chemical corrosion when in contact with injection molding equipment and molds. In subsequent use, PEEK injection molded products can maintain stability in various chemical environments and can be used for the manufacturing of corrosion-resistant components in industries such as chemical and pharmaceutical.It is worth mentioning that PEEK has good wear resistance and self-lubricating properties. It has a high surface hardness and exhibits a low wear rate during friction. Meanwhile, its self-lubricating properties result in a low friction coefficient, typically between 0.1-0.3. Based on these characteristics, PEEK injection molded products are particularly suitable for manufacturing components that require low friction and high wear resistance, such as bearings, sliders, etc. This not only extends the service life of the components, but also reduces energy loss and noise caused by friction.In addition, PEEK material also has good hydrolysis resistance and radiation resistance.Its performance can still remain stable in humid environments or under radiation. This makes PEEK injection molded products have broad application prospects in some special fields, such as medical devices, nuclear industry, etc.In summary, these characteristics of PEEK material have laid a solid foundation for its application in the field of injection molding. By deeply understanding and fully utilizing these characteristics, engineers are able to continuously optimize injection molding processes and manufacture high-quality, high-performance PEEK injection molded products that meet the increasingly stringent requirements for material performance in various industries. In the future, with the continuous advancement of technology, the application of PEEK materials in the field of injection molding will become more extensive and in-depth.