Термопластичные инженерные пластмассы
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What is Thermoplastic Engineering Plastics
Thermoplastic Engineering Plastics, also called thermoplastic polymers, are a group of synthetic resins that offer high-performance capabilities and enhanced plastic characteristics compared to other standard plastic materials.More specifically, engineering plastics possess a wide spectrum of properties (especially mechanical and/or thermal), enabling them to perform much better in structural applications than commonly used commodity plastics. In addition, they maintain stability over a wide temperature range and resist substantial mechanical stress and chemical or physical changes in the environment.
Benefits of Thermoplastic Engineering Plastics
Durable
Thermoplastic engineering plastics are ductile and impact resistant. In many applications thermoplastic engineering plastics have a longer service life compared to alternative materials because they don't dent, ding, chip, crack, splinter, or fray. This reduces service calls and component replacements in even the most demanding applications.
Chemical And Stain Resistant
Most thermoplastic engineering plastics are chemical and stain resistant and will not yellow or discolor as a result of contact with many chemicals, including industrial cleaners and solvents. Certain compounds are graffiti resistant, making them ideal for outdoor applications.
Integral Colours And Effects
The colour is blended into the material during the manufacturing process, so the finish effects are consistent throughout the material's thickness. Custom colours and finishes are available. Most thermoplastic engineering plastics can be custom colour matched for an ideal product hue.
Meet Codes And Requirements
Thermoplastic engineering plastics can be blended with additives to meet strict smoke, flammability, and toxic gas release requirements for aircraft and mass transit interior applications. Many thermoplastic compounds are inherently biocompatible, which means they're ideal for medical device applications.
Environmentally Friendly
Thermoplastic engineering plastics are recyclable and contain no vocs, making them an environmentally sound solution. Thermoforming manufacturing processes do not outgas vocs or create any hazardous waste to dispose of. Thermoplastic engineering plastics support end-of-life recyclability and life-cycle design.
Application of Thermoplastic Engineering Plastics
Mechanical Plastic Units
Examples include Cams, couplings, and gears. High impact and tensile strength and good stability for a long period under high temperatures are important properties of these plastic parts.
Chemical and Heat Resistant Plastic Components
Examples include valve covers and seats, fuel rails, water pump housings, etc. These engineering plastic products require exceptional resistance to corrosion environments and high temperatures.
Electrical Plastic Parts
These parts require excellent electrical resistance, tensile strength, and stability. Examples include connectors and relays.
Low Friction Components
The most vital requirement in applying these parts is a low coefficient of friction. Examples include wear-resistant surfaces, bearings, guides, and slides.
Types of Thermoplastic Engineering Plastics
Polyether Ether Ketone (PEEK)
PEEK is a semi-crystalline thermoplastic with outstanding thermal and mechanical properties. Similarly to other advanced thermoplastics, it owes its properties to its peculiar chemical structure, containing phenyl and ketone groups which offer high stability and rigidity.PEEK possesses a high E-modulus and tensile strength. It melts at 350°C and is resistant to high temperatures. Its chemical resistance to organic solvents is also outstanding, and it is not hydrolyzed by either water or high-pressure steam. Very good resistance to radiation is another feature of this advanced plastic material.
Polybenzimidazole (PBI)
Polybenzimidazole (PBI) is an amorphous thermoplastic. It can be classified as an extreme thermoplastic material, exhibiting the highest thermal stability of all advanced thermoplastics. It can withstand temperatures as high as 430°C for prolonged periods, and above 500 °C for up to a few hours.Above 200°C, high molar mass PBI possesses the highest mechanical properties than any other unfilled plastic material. It does not burn and preserves its mechanical characteristics even when charred. Because of this, it is one of the most outstanding advanced thermoplastic products available on the market.
Fluoropolymers (PTFE)
Fluoropolymers, such as PTFE, are characterized by the presence of highly stable carbon-fluorine chemical bonds.This chemical stability, coupled with high crystallinity, makes PTFE especially heat-resistant, even at high temperatures. Fluoropolymers possess outstanding chemical stability and are resistant to most solvents and corrosive chemicals. They possess excellent strength and stiffness. Excellent dielectric properties and inherently low friction behavior are also key advantages of these materials.
General Engineering Plastics
Engineering thermoplastics ensure consistent mechanical properties between 5 °C and 120 °C. They can be used to replace heavier and less reliable materials, such as bronze or rubber. [2] Good chemical stability, non-toxicity, and good electrical properties are additional advantages of many engineering thermoplastics.
General Properties of Thermoplastic Engineering Plastics
Chain flexibility and mobility
In plastics, chemical microstructure is strongly tied to the material's macroscopic properties. The structure-property relationship of Thermoplastic Engineering Plastics is complex, but generally speaking, it boils down to chain flexibility, i.e. the freedom of movement of the atoms inside each polymer chain, and chain mobility, i.e. the freedom of movement of polymer chains with respect to each other.Intrinsic chain flexibility is related to the energy required by molecules to rotate around chemical bonds. This, in turn, depends on the chemical structure of each polymer. If the polymer chain is linear and composed of mostly single aliphatic bonds, such as in the case of polyethylene (PE), polymer chains will be flexible.
Glass transition temperature and heat deflection temperature
The differences in chain flexibility and mobility are mirrored in the macroscopic properties of thermoplastics.Glass transition temperature, or Tg, is defined as the temperature below which a plastic material behaves as a glassy solid. Smaller flexibility and mobility of the polymer chains lead to higher Tg. All engineering and advanced thermoplastics are high-Tg materials. This makes them more suitable for demanding applications due to their higher thermal and mechanical resistance.
Crystallinity
Thermoplastic Engineering Plastics are classified as either semi-crystalline or amorphous. Put simply, crystallinity is a measure of the degree of order in the arrangement of the polymer chains. While amorphous thermoplastics have a random molecular arrangement, semi-crystalline thermoplastics possess a regular molecular structure.This has significant consequences on the functional properties of plastic products. Semi-crystalline thermoplastics, such as polyethylene terephthalate (PET) or PEEK, typically possess higher mechanical strength and stiffness compared to amorphous materials. They also tend to exhibit better chemical resistance.
How to Choose Thermoplastic Engineering Plastics
Impact Resistance
Will theThermoplastic Engineering Plastics be subject to being bounced around or bumped or does it need to hold up to projectiles? Consider the casing of a suitcase, an impact guard around a hockey rink to protect fans, vinyl siding, or a cafeteria tray that could be dropped, slammed, or banged around - these are all formed from impact-resistant plastics to prevent breaking and denting.
Scratch Resistance
Is it necessary that your product hold up to possible scratching and abrasions to preserve both structural integrity and appearance? Windows, safety glasses, and signs are often made from plastics that are resistant to abrasion or those that can be treated with a scratch-resistant coating.
Chemical Resistance
Consider if your product be exposed to aggressive chemicals, such as industrial chemicals or consistently exposed to more mild chemicals such as a cleaning product container.
Tensile Strength
Tensile strength, or how much a material can be pulled or stretched without breaking or cracking, is necessary in some applications, especially when choosing plastic in place of metal or as a fabric reinforcement.
Weight
One of the benefits of plastic over metal and other materials is that it's durable while also lightweight. This has improved fuel efficiency in vehicles and made medical implants more effective and comfortable for users.
Customization Capability
From adding plasticizers to improve flexibility to scratch-resistant or anti-static coatings, some thermoplastics offer a wide range of customization whereas others are limited. Knowing what you need from your plastic helps you narrow down the options.
Transparency
Do you need a transparent plastic for windows, safety glasses, or product packaging? This, combined with impact resistance, scratch resistance, and other factors can steer your choice to which thermoplastic is best for your thermoforming project.
Material Selection
Material selection is a critical first step in the thermoplastic engineering plastics molding process. The choice of material impacts the part's functionality, aesthetics, and longevity. Commonly used thermoplastic polymers, like polyethylene and polycarbonate, are selected based on their mechanical properties, heat resistance, and suitability for the intended application.
Material Preparation
Preparation involves treating raw plastic pellets for optimal performance. This includes drying to remove moisture, which could affect the melting process and the quality of the molded part. The pellets are then loaded into the injection molding machine's hopper.
Melting
In the melting stage, plastic pellets are heated in a barrel with a reciprocating screw, turning them into a molten state. Precise temperature control is paramount to achieve the desired viscosity and flow characteristics of the molten plastic.
Injection
During injection, the molten plastic is propelled into a mold cavity under high pressure. This stage is critical for defining the part's shape and surface finish. The injection pressure and speed are carefully calibrated to fill the mold completely and uniformly.
Cooling and solidifying
Once injected, the thermoplastic engineering plastics begins to cool and solidify within the mold. Cooling time is essential for the integrity of the part and is influenced by the thermoplastic's thickness and thermal properties.
Ejection
After cooling, the part is ejected from the mold. Ejector pins facilitate this process, ensuring the part is released without damage. The precise timing and force of ejection are vital to maintain the quality of the finished part.
Post-processing
Post-processing involves various methods to refine the part, including trimming excess material, polishing for surface finish, and painting if necessary. These techniques enhance the part's appearance and functionality, meeting the specific requirements of the application.
Understanding The Impact of Thermoplastic Engineering Plastics In Materials Engineering
Resource Efficiency
One of the most notable aspects of thermoplastic engineering plastics is how efficiently they can be produced and processed. These materials can be repeatedly melted and reshaped without significant degradation. This quality, known as recyclability, represents a considerable advantage from an environmental and economical perspective. Moreover, their easy fabrication and moulding processes contribute to time and cost-efficient production, which is vital in the fast-paced industrial sector.
Material Performance
Thermoplastic engineering plastics showcase diverse functional properties. For instance, some thermoplastic engineering plastics demonstrate high heat resistance, making them suitable for applications that involve high temperatures or require insulation. Others show impressive chemical resistance, and hence they are chosen for application environments involving corrosive substances.
Design Freedom
The flexibility of thermoplastic engineering plastics allows them to be moulded into intricate and complex shapes. This grants engineers and designers free rein to explore innovative designs without worrying about the material's adaptability. This aspect is particularly valued in sectors like automotive, aerospace and medical where the balance between design, functionality and performance is a must.
Durability
Interestingly, despite their often low weight (high strength-to-weight ratio), thermoplastic engineering plastics can be incredibly durable - resistant to impact, chemical attack and weathering. Depending on the type of thermoplastic, they may also exhibit high tensile strength, rigidity, and toughness, extending the lifespan of the final product. Taking these characteristics together, it's evident that thermoplastic engineering plastics have significantly influenced modern materials engineering, dictating design choices, manufacturing processes, product performance and above all, the realm of possibilities.
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MOSINTER GROUP was founded in 2004. The head office is located in Ningbo, China. Production facilities are located in Zhejiang, Jiangsu and Shandon provinces in China. MOSINTER GROUP, specialized in the production and marketing of chemical products, has superior production equipment and a high-performance sales team, as well as advanced production technology, comprehensive quality management system and modernized testing methods.
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