LCP plastic name liquid crystal polymer. It is a new type of polymer material that generally exhibits liquid crystallinity in the molten state. These materials have excellent heat resistance and molding processability. The polymerization method is mainly composed of melt polycondensation, and the wholly aromatic LCP is assisted by solid phase polycondensation to obtain a high molecular weight product. Non-aromatic LCP plastic materials are often prepared by one-step or two-step melt polymerization. The technology of continuous melt polycondensation to obtain high molecular weight LCP has been developed. Tensile strength and flexural modulus can exceed the development of various thermoplastic engineering plastics. Mechanical properties, dimensional stability, optical properties, electrical properties, chemical resistance, flame retardancy, processability, heat resistance, and low coefficient of thermal expansion. The main characteristics of LCP plastic 1. LCP plastic has self-reinforcing property: it has the characteristics of irregular fiber structure, so the liquid crystal plastic which is not reinforced can reach or exceed the mechanical strength and modulus of tens of glass fiber reinforced by ordinary engineering plastics. Level. If it is reinforced with glass fiber, carbon fiber, etc., it is far more than other engineering plastics. 2, liquid crystal polymer also has excellent thermal stability, heat resistance and chemical resistance, for the creep characteristics of most plastics, liquid crystal materials can be neglected, and wear and abrasion resistance are excellent. 3. LCP plastic has good weather resistance and radiation resistance, excellent flame retardancy, and can extinguish the flame without continuing to burn. Its combustion level reaches the UL94V-0 level. 4. LCP plastic has excellent electrical insulation properties. Its dielectric strength is higher than that of general engineering plastics, and its arc resistance is good. In the continuous use temperature of 200-300 ° C, its electrical properties are not affected. Intermittent use temperature can reach about 316 °C. 5. LCP plastic has outstanding corrosion resistance. LCP products will not be corroded in the presence of 90% acid and 50% alkali. For industrial solvents, fuel oil, detergent and hot water, they will not be contacted after contact. Dissolved, it will not cause stress cracking. The main use of LCP plastic 1. LCP plastics are excellent in high strength, high rigidity, high temperature resistance and electrical insulation. They are used in electronics, electrical, optical fiber, automotive and aerospace. 2, the fiber made of liquid crystal can be used to make fish nets, sporting goods, brake pads, optical fiber display materials, etc., can also be made into films for soft printed circuits, food packaging and so on. 3, LCP plastic has been used in microwave oven containers, can withstand high and low temperatures. LCP can also be used for printed circuit boards, satellite electronic components, jet engine parts; for electrical and electronic machinery parts or components; and for medical applications. 4, LCP plastics can be added high-filling agent as integrated circuit packaging material, instead of epoxy resin as the encapsulation material of the coil bobbin; for fiber optic cable joint sheath and high-strength components; instead of ceramics for filling materials in chemical separation towers, etc. . 5. LCP plastics can also be blended with polysulfone, PBT, polyamide and other plastics to form alloys. After molding, the mechanical strength of the parts is high. It can replace plastics such as glass fiber reinforced polysulfone, which can improve mechanical strength. It can also increase the strength of use and chemical stability. The LCP is currently being studied for panels external to the spacecraft, brake systems for exterior vehicles, and the like. Other understanding of LCP plastics Thermotropic LCP plastics have a wholly aromatic polyester and copolyester structure. It also has a densely packed linear polymer chain structure that forms a product with good unidirectional mechanical properties. Good high temperature performance (heat distortion temperature is 121-355 ° C), good radiation resistance, hydrolysis resistance, weather resistance, chemical resistance, inherent flame retardancy, low smoke generation, high dimensional stability, low moisture absorption Strain, very low coefficient of linear expansion, high impact strength and stiffness (LCP plastics are stronger than steel at the same weight, but rigid is only 15% of steel). LCP is resistant to chemicals such as acids, solvents and hydrocarbons and has good barrier properties. Liquid crystal aromatic polyester is oriented in the liquid crystal state due to its macromolecular chain. It has a heterogeneous fiber structure, special properties, and high product strength, which is no less than metal and ceramic. Tensile strength and flexural modulus can be more than 10 years of development of various thermoplastics. The properties, processability and price of the obtained liquid crystal polyester are different depending on the monomers used. The choice of fillers and the amount of filler added also affect its performance. LCP plastic replacement Alternative 1: It depends on which performance of LCP is substituted. If it is high temperature resistant, it is more common to use PPS, Pa46, Pa6T, Pa9T, PPA, etc. 9T is cheaper. Alternative 2: The most suitable injection pressure must depend on the material, the shape of the product, the mold design (especially sprues, runners, gates) and other molding conditions. However, LCP has no grade and its melt viscosity is very low, so the injection pressure is lower than that of a general thermoplastic resin. It is a good method to use low pressure at the beginning of the molding and then slowly increase the pressure. The molded article can be molded under the injection pressure of 15 MPa to 45 MPa. In addition, the curing time of LCP is relatively fast, so the injection speed is fast and easy to get good results. Alternative 3: The molding cycle depends on the size, shape, thickness, mold structure and molding conditions of the molded article. As mentioned above, LCP has good fluidity, so its filling time is short and the curing speed is faster, so we can get a shorter molding cycle. A representative molding cycle is from 10 seconds to 30 seconds.
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Comprehensive analysis of LCP plastics and their characteristics, main uses