POE is composed of octene and polyolefin resin. The continuous phase and the dispersed phase exhibit a two-phase separated polymer blend. The image by scanning electron microscope or phase contrast microscope shows that rubber can be formed into continuous phase and resin is dispersed. The phase is an interpenetrating network structure in which the rubber is a dispersed phase, the resin is a continuous phase, or both exhibit a continuous phase. As the phase changes, the properties of the blend change. If the rubber is in the continuous phase, it exhibits the properties of the vulcanized rubber; when the resin is in the continuous phase, the performance is close to that of the plastic. Processing and blending: POE does not require mixing and vulcanization. It can be processed by ordinary thermoplastic processing equipment. Molding processing temperatures and processing pressures should generally be slightly higher and can be processed at very high processing speeds. It can be injection molded, extruded, or processed into a sheet or film by a calender, and can be blow molded to produce a complex shaped product by thermoforming. Various pigments can be added to make different colors as needed. Some manufacturers provide special materials such as oil resistant, flame retardant, electrically stable and electrostatic coatings depending on the requirements of the product. Sometimes, in order to improve processability and performance of certain articles or to reduce costs, certain compounding agents such as antioxidants, softeners and fillers, colorants and the like may also be added. Scraps and scrap can be recycled for repeated processing. However, the general blending ratio does not exceed 30%, so there is no effect on the performance of POE on the blending system. POE is a thermoplastic elastomer that achieves in-situ polymerization of ethylene and octene using a metallocene catalyst, which is characterized by: (1) The soft chain crimp structure of octene and the crystalline ethylene chain act as physical crosslinking points, so that it has both excellent toughness and good processability. (2) There is no unsaturated double bond in the molecular structure of POE, and it has excellent aging resistance. (3) POE has a narrow molecular weight distribution, good fluidity, and good compatibility with polyolefins. (4) Good fluidity can improve the dispersion effect of the filler and also increase the weld line strength of the product. As the POE content increases, the impact strength and elongation at break of the system are greatly improved. It can be seen that POE has excellent toughening effect on PP and has good compatibility with PP and activated calcium carbonate. This is because the molecular weight distribution of POE is narrow, and the side octyl group in the molecular structure is longer than the side ethyl group, and a linkage point can be formed in the molecular structure, which acts as a linkage and buffer between the components, so that the system is dispersed when subjected to an impact. The effect of cushioning impact energy reduces the chance that the silver streaks develop into cracks due to the force, thereby increasing the impact strength of the system. When the system is subjected to tension, the network-like structure formed by these joints can undergo large deformation, so the elongation at break of the system increases remarkably. When the content of POE increases, the tensile strength and bending of the system Both the strength and the flexural modulus are reduced, which is determined by the performance of the POE itself, so the POE content should be controlled below 20%. The relationship between the content of POE and the melt index, after the addition of POE, the melt index of the system increases. POE itself has better fluidity. Its addition also improves the fluidity of the whole system. When the POE content exceeds 15 parts, the melt index of the system is basically unchanged. If the liquidity of the system is to be continuously improved, it cannot be completely Rely on POE. Basic characteristics: (1) POE has the general physical properties of thermoplastic elastomers, such as moldability, waste recycling and vulcanizate properties. (2) The price is low, and the relative density is small, so the volume is low. (3) Excellent heat resistance and cold resistance, and a wide range of use. (4) Good weather resistance and aging resistance. (5) Oil resistance, compression set resistance and wear resistance are not very good. Scope of application: mainly used for modifying and toughening PP, PE and Pa to make bumpers, fenders, steering wheels, pads and so on in the automotive industry. The wire and cable industry has high insulation and sheathing requirements for heat resistance and environmental resistance. Also used in industrial products such as hoses, conveyor belts, tapes and molded products. Medical equipment and household appliances, stationery, toys, etc., as well as packaging films and so on. Alnico Magnets are traditionally classified using numbers assigned by the Magnetic Materials Producers Association (MMPA), for example, Alnico 3 or Alnico 5. Cast Alnico Magnet Cast Alnico Magnet,Cast Alnico Block Magnet,Cast Sintered Alnico Magnet,Strong Cast Alnico Pot Magnet Jinyu Magnet (Ningbo) Co., Ltd. , https://www.magnetbonwin.com
Alnico magnets are produced by casting or sintering processes.[8] Anisotropic alnico magnets are oriented by heating above a critical temperature and cooling in the presence of a magnetic field. Both isotropic and anisotropic alnico require proper heat treatment to develop optimal magnetic properties-without it alnico's coercivity is about 10 Oe, comparable to technical iron, which is a soft magnetic material. After the heat treatment alnico becomes a composite material, named "precipitation material"-it consists of iron- and cobalt-rich[9] precipitates in rich-NiAl matrix.
Alnico's anisotropy is oriented along the desired magnetic axis by applying an external magnetic field to it during the precipitate particle nucleation, which occurs when cooling from 900 °C (1,650 °F) to 800 °C (1,470 °F), near the Curie point. Without an external field there are local anisotropies of different orientations due to spontaneous magnetization. The precipitate structure is a "barrier" against magnetization changes, as it prefers few magnetization states requiring much energy to get the material into any intermediate state. Also, a weak magnetic field shifts the magnetization of the matrix phase only and is reversible.
Alnico magnets are ideal for high temperature applications up to 550ºC
. Cast Alnico Magnet is very stable, has good corrosion resistance and a typical hardness of 50 Rockwell C. Once cast, the material is so hard that the only machining possible is grinding
. Cast Alnico Magnet represents the most versatile magnet material available. The range of properties can be accurately designed for specific applications by changes to element analysis and heat treatment.