Polybutylene terephthalate (PBT) is a semi-crystalline, thermoplastic saturated polyester, generally milky white, granular solid at room temperature, is commonly used in the production of optical cable thermoplastic secondary coating material.
Optical fiber secondary coating is a very important process in optical fiber production. Simply speaking, adding a protective layer to the optical fiber primary coating or buffer layer can improve the ability of optical fiber to resist longitudinal and radial stress and facilitate the optical fiber post-processing. Because the coating material is close to the optical fiber, it has a greater impact on the performance of the optical fiber, so the coating material is required to have a small linear expansion coefficient, high crystallinity after extrusion, good chemical and thermal stability, smooth inner and outer walls of the coating layer, a certain tensile strength and Young’s modulus, and has good process performance. Fiber coating is generally divided into two categories: loose cover and tight cover. Among them, the loose sheath material used in the loose sheath coating is the secondary coating layer extruded in the loose sleeve situation outside the primary coating fiber
PBT is a common loose sleeve material with excellent forming and processing properties, low moisture absorption and high cost performance. Mainly used in PBT modification, PBT wire drawing, casing, film drawing and other fields. PBT has good mechanical properties (such as tensile resistance, bending resistance, side pressure resistance), good solvent resistance, oil resistance, chemical corrosion resistance, and fiber paste, cable paste and other components of the cable have good compatibility, and has excellent molding processing performance, low moisture absorption, cost-effective. Its main technical performance standards include: intrinsic viscosity, yield strength, tensile and bending elastic modulus, impact strength (notch), linear expansion coefficient, water absorption, hydrolysis resistance and so on.
However, with the change of fiber cable structure and operating environment, more requirements are put forward for fiber buffer bushing. High crystallization, low shrinkage, low linear expansion coefficient, high toughness, high compressive strength, excellent chemical resistance, good processing performance, and low-cost materials are the goals pursued by optical cable manufacturers. At present, there are shortcomings in the application and price of the beam tube made of PBT material, and foreign countries have begun to use PBT alloy materials to replace pure PBT materials, which has played a good effect and role. At present, several major domestic cable companies are actively preparing, cable material companies need continuous technological innovation, research and development of new materials.
Of course, in the overall PBT industry, fiber optic cable applications only occupy a small part of the PBT market. According to industry sources, in the entire PBT industry, the majority of the market share is mainly occupied by the two fields of automotive and power. Connectors, relays and other products made of modified PBT materials are widely used in automotive, electronic and electrical appliances, mechanical equipment and other fields, and even PBT has applications in the textile field, such as the bristles of toothbrushes are also made of PBT. The following are the general applications of PBT in various fields:
1.The electronic and electrical fields
PBT materials are widely used in electronic and electrical fields, such as power sockets, plugs, electronic sockets and other household electrical parts. Because PBT material has good insulation performance and high temperature resistance, it is very suitable for the shell, bracket, insulation sheet and other parts of electronic and electrical equipment. In addition, PBT materials can also be used to make LCD screen back cover, TV shell and so on.
2.The automotive field
PBT materials are also widely used in the automotive field. Due to its advantages of high temperature, corrosion and wear resistance, PBT materials are widely used in the manufacture of automotive parts, such as intake manifold, oil pump housing, sensor housing, brake system components, etc. In addition, PBT materials can also be used for car seat headrests, seat adjustment mechanisms, etc.
3.The machinery industry
In the machinery industry, PBT materials are often used to manufacture tool handles, switches, buttons, etc. PBT material has excellent mechanical strength and wear resistance, can withstand various mechanical forces, and has good chemical corrosion resistance, suitable for various parts in the field of machinery industry.
4.The medical equipment industry
PBT material has good high temperature resistance and high chemical stability, which is very suitable for the production of medical devices. For example, PBT materials can be used to make medical device housings, pipes, connectors, etc. In addition, PBT materials can also be used to make medical syringes, infusion sets and various therapeutic instruments.
5. The optical communication
In the field of optical communication, PBT is widely used in optical cable manufacturing as a common loose sleeve material. In addition, PBT materials are widely used in optical devices. Due to its good optical properties and high temperature resistance, PBT materials are used to make optical fiber connectors, optical fiber distribution frames, etc. In addition, PBT materials can also be used to make lenses, mirrors, Windows and other optical components.
From the perspective of the entire industry, in recent years, relevant enterprises are committed to the development of a variety of application of new technologies and new products, and PBT has developed in the direction of high performance, functionalization and diversification. Pure PBT resin tensile strength, bending strength and bending modulus are low, can not be widely used in the industrial field, so for the needs of the industrial field, the industry through modification to improve the functionality of PBT. For example, glass fiber is added to PBT – glass fiber has the advantages of strong applicability, simple filling process and low cost. By adding glass fiber to PBT, the original advantages of PBT resin are brought into play, and the tensile strength, bending strength and notch impact strength of PBT products are significantly improved.
At present, the main methods at home and abroad are copolymerization modification, inorganic material filling modification, nanocomposite technology, blending modification, etc., to improve the comprehensive performance of PBT. The modification of PBT materials mainly focuses on the aspects of high strength, high flame retardant, low warpage, low precipitation and low dielectric.
In general, as far as the entire PBT industry is concerned, the application demand in various fields is still very considerable, and various modifications according to market demand are also the common research and development goals of PBT industry enterprises.
Post time: Dec-17-2024