TPE
The thermoplastic elastomer TPE (Thermoplastic Elastomer) is a rubber with high elasticity, high strength, high resilience and injection molding processing. It is environmentally friendly, non-toxic, safe, wide in hardness, excellent in coloring, and soft to the touch. , weather resistance, fatigue resistance and temperature resistance, excellent processing performance, no need to vulcanize, can be recycled to reduce costs, can be double injection molding, and coated with PP, PE, PC, PS, ABS and other base materials, It can also be molded separately.
Thermoplastic elastomers have both the processing properties of thermoplastics and the physical properties of vulcanized rubber. They are a combination of advantages of plastics and rubber. Thermoplastic elastomers are occupying a territory that was originally only vulcanized rubber. In the past ten years, the rapid development of the electronics, electronics, communications and automotive industries has driven the rapid development of the thermoplastic elastomer market.
Thermoplastic elastomers (TPE) have the physical and mechanical properties of vulcanized rubber and the processability of thermoplastics. Since there is no need for thermal vulcanization, the production of the product can be completed using general-purpose plastic processing equipment. This feature has shortened the rubber industry production process by 1/4, saved energy by 25% to 40%, and improved efficiency by 10 to 20 times. This is another revolution in materials and process technology in the rubber industry.
TPE application
It can be processed by a general thermoplastic molding machine and does not require special processing equipment.
Production efficiency has increased significantly. It can be directly vulcanized with a rubber injection molding machine. The time is reduced from the original 20min to less than 1min. Since the required vulcanization time is very short, it can be directly vulcanized by the extruder, and the production efficiency is greatly improved.
Easy to recycle and reduce costs. The waste generated during the production process (extracting raw edges, extruding rubber) and the final waste can be directly returned to reuse: used TPE can be easily recycled and reused, reducing environmental pollution and expanding the source of renewable resources.
TPV
TPV is called Thermo Plastic Vulcanizate, Means thermoplastic vulcanizate. TPV, generally referred to as a PP+EPDM blended polyolefin alloy thermoplastic elastomer. TPV is mainly composed of two parts, one is plastic as the continuous phase, and the other is rubber as the dispersed phase. Usually the rubber needs to be combined with softening oil or plasticizer. Vulcanizing agent and some auxiliary additives are also essential. To reduce costs or improve performance in some areas, some inorganic fillers will be added.
Processing characteristics
TPV is a thermoplastic rubber that can be extruded directly (and coextruded with other plastics), injection molded (and encapsulated with other plastics), and blow molded. In the TPV system, the shearing action when the material flows in a high temperature state is strong due to the dispersed rubber phase containing the crosslinked structure. This also makes the flowability of the TPV lower in all thermoplastic elastomers. The most ideal way to process TPV is extrusion, followed by blowing, and again injection molding.
Extrusion, main molding, and blow molding temperature, it is recommended that the injection temperature be slightly higher than the blow molding or extrusion temperature under the same conditions of 170 ° C - 210 ° C.
Color matching performance
Due to the introduction of cross-linking, the TPV particles are more or less yellow with a little yellow, and the temperature and other climatic conditions will make the TPV material of the primary color deeper. Therefore, it is not recommended to use TPV materials to process light-colored products.
TPU
Thermoplastic polyurethane (TPU) is a fully thermoplastic elastomer. Like all thermoplastic elastomers, TPU has elasticity and melt processability. In addition, it can be processed on extrusion and injection, blow molding and compression molding equipment. It can be vacuum formed or solution coated and is well suited for a variety of manufacturing methods. TPU can even be colored by many processes. But more important than any other thermoplastic elastomer, TPU can provide a considerable combination of physical properties, making it a very flexible material for many applications.
Processing guide
（1） Because TPU has strong hygroscopicity, it is best to dry thoroughly before processing. Especially in humid places and seasons, it is necessary to prepare a dehumidifying dryer, especially extrusion molding, which has stricter requirements on moisture;
（2） Since the dependence of viscosity on temperature is slow, it is necessary to improve the temperature control accuracy;
（3） The structure and length to diameter ratio of the screw (eg compression ratio, groove depth, L/D, etc.) should be considered from the characteristics of the material;
（4） Consider the mold structure according to the fluidity of the material (do not cause trapped nozzles, runners, gates, etc.);
（5） The power setting of the molding machine should be slightly larger (can be set to 1.5 & mdash of general-purpose resin; — 2 times);
（6） In order to obtain better performance after molding, it can be annealed to restore the original properties (especially materials that are not completely plasticized).
Processing technology
It can be produced by injection, extrusion, blow molding and other processing methods. Extrusion molding and injection molding are widely used processing methods for TPU. The melt temperature range of extrusion and injection molding is wide, generally between 180-245 ° C, the plasticizing effect is good, the melt is uniform, and the molding process is easy. Suitable for all plastic production and processing processes.
TPEE
Thermoplastic Polyester Elastomer (TPEE), also known as polyester rubber, is a type of linear block copolymer containing a PBT (polybutylene terephthalate) polyester hard segment and an aliphatic polyester or polyether soft segment. Object. TPEE combines the excellent elasticity of rubber with the ease of processing of thermoplastics, adjustable hardness and flexibility, and is a new product of thermoplastic elastomers.
Processing guide
TFEE is resistant to hydrolysis and does not react with moisture in the air. It has a slight water absorption. For the perfect part, it needs to be dried before use (although the moisture content is below 0.%, extrusion and molding There will be no defects).
TPEE degrades at high temperatures in the presence of acidic media. Therefore, TPEE cannot be compounded with an acidic additive.
Before the molding process, it must be in the blast air supply box of 100-110 °C for 3-5 hours, and heat-processed. Do not put it in humid air after drying, otherwise it will affect the performance.
Processing technology
Injection molding: The barrel temperature should be 5-15C higher than the melting point of the product, the injection pressure is 60-80Mpa, the mold temperature is 20-50°C, and the injection speed is medium and low speed.
Extruded wire: When the wire is extruded, the temperature of the barrel should be 5-10 °C higher than the melting point of the product. The recommended length to diameter ratio is 24:1, and the screw speed is medium and low speed.
