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Polybutylene terephthalate (PBT), a polyester made by polycondensation of terephthalic acid and 1,4-butanediol, is an important thermoplastic polyester and one of the top five engineering plastics.
Polybutylene terephthalate is a milky white translucent to opaque, semi-crystalline thermoplastic polyester with high heat resistance. It is not resistant to strong acids and bases, is resistant to organic solvents, is flammable, and decomposes at high temperatures.
Polybutylene terephthalate is widely used in automobiles, mechanical equipment, precision instrument parts, electronic appliances, textiles and other fields.
Most of the PBT resin is processed into blends for use, after a variety of additives to modify, and other resins can be blended to obtain good heat resistance, flame retardant, electrical insulation and other comprehensive performance and good processing performance. Widely used in electrical appliances, automobiles, aircraft manufacturing, communications, home appliances, transport and other industries. For example, PBT by glass fibre modification, can be used to manufacture the requirements of long-term working conditions at higher temperatures, the size requires high stability of electronic parts.PBT breakdown voltage is high, suitable for the production of high-voltage parts, due to its molten state of mobility is good, suitable for injection processing of complex structure of electrical parts, such as integrated circuits, sockets, printed circuit boards, computer keyboards, electrical switches, Fuses, temperature control switches, protectors and so on. Automobile bumpers, carburettors, spark plugs, oil supply system parts, ignition, etc.. In the field of communications PBT is widely used in programme-controlled telephone integrated modules, terminal boards, power tools and so on.
PBT production methods are mainly ester exchange method and direct esterification polycondensation method, the catalyst used is titanate tetraisopropyl ester, titanate tetrabutyl ester, alkoxyzirconium, alkoxytin and so on.
(1) Ester exchange method: Ester exchange method adopts dimethyl terephthalate (DMT) as raw material, which is firstly ester-exchanged with 1,4-butanediol to produce dibutylene terephthalate, and then the latter is polycondensed to produce polybutylene terephthalate. The ester exchange method adopts the ratio of 1,4-butanediol in excess, the molar ratio of DMT and 1,4-butanediol is 1ː1.3~1.7, and the reaction temperature is about 200¡æ, which is conducive to the reaction equilibrium towards the generation of dibutylene terephthalate, and it can reduce the occurrence of side reactions. The second step of the polycondensation reaction is carried out at a temperature of about 250~260¡ãC and under reduced pressure to 0.1~1mm Hg. The ester exchange method can be carried out intermittently or continuously. The advantage is that the equipment is relatively simple, the reaction conditions are more moderate, step-by-step control of the ester exchange and polycondensation reaction is relatively easy, but the batch production, the efficiency is lower.
(2) Continuous direct esterification polycondensation method: continuous direct esterification polycondensation technology is more complex, due to the process materials are in a high temperature, high vacuum melting state, the equipment materials, equipment structure, material transport, reaction conditions are more complex to control. Therefore, a variety of patented technologies have been developed. The more famous ones are; Lurgi Zemmer technology, which is characterised by the use of esterification, pre-polycondensation and polycondensation of three reactors, the polycondensation reactor is a kind of horizontal disc reactor, a single production line can reach 120,000 tonnes/year scale. The product quality is high, and the by-product tetrahydrofuran can be directly used in the production of polytetrahydrofuran; Hitachi technology from Japan has four different types of reactors, which can simultaneously produce two kinds of products of high viscosity and medium viscosity. The scale of a single production line can be up to 60,000 tonnes/year; Uhde Inyenta Fischer technology adopts tower reactor, esterification and polycondensation can be completed in one reactor, which can produce PBT products with 20~35 degree of polymerisation, and if it is necessary to produce products with 80~150 degree of polymerisation, it can be moved to another horizontal polycondensation reactor called DISCAGE.
(3) Solid phase polycondensation process: the above process can only produce PBT products with polymerisation degree of about 100 and molecular weight of 20,000~35,000, which can meet the demand of textile and membrane products. For some engineering plastics products need polymerisation degree of 150~200, molecular weight of 40,000 above PBT, it is necessary to use solid-phase polycondensation process to manufacture. The solid-phase polycondensation process is a complex reaction, carried out in a solid-phase polycondensation reactor, which consists of four main processes to complete, namely, pre-crystallisation, annealing, reaction and cooling. It can be carried out intermittently or continuously.
Nanjing Suminoe Precision Machinery Co., Ltd. is a collection of scientific research, production, sales in one of the high-tech enterprises, and has always adhered to the integrity, equality, customer interests first business philosophy, in order to better improve the quality of the equipment, step into a more professional standardised production track. We set up a plastic sheet plate, casting, bi-directional stretching, non-woven nonwoven meltblown cloth, film composite, renewable granulation environmental protection and recycling system and coating machine manufacturing system and other seven categories of equipment, independent research and development technology centre and production departments. Provide a professional full set of technical solutions
Polybutylene terephthalate is a milky white translucent to opaque, semi-crystalline thermoplastic polyester with high heat resistance. It is not resistant to strong acids and bases, is resistant to organic solvents, is flammable, and decomposes at high temperatures.
Polybutylene terephthalate is widely used in automobiles, mechanical equipment, precision instrument parts, electronic appliances, textiles and other fields.
Most of the PBT resin is processed into blends for use, after a variety of additives to modify, and other resins can be blended to obtain good heat resistance, flame retardant, electrical insulation and other comprehensive performance and good processing performance. Widely used in electrical appliances, automobiles, aircraft manufacturing, communications, home appliances, transport and other industries. For example, PBT by glass fibre modification, can be used to manufacture the requirements of long-term working conditions at higher temperatures, the size requires high stability of electronic parts.PBT breakdown voltage is high, suitable for the production of high-voltage parts, due to its molten state of mobility is good, suitable for injection processing of complex structure of electrical parts, such as integrated circuits, sockets, printed circuit boards, computer keyboards, electrical switches, Fuses, temperature control switches, protectors and so on. Automobile bumpers, carburettors, spark plugs, oil supply system parts, ignition, etc.. In the field of communications PBT is widely used in programme-controlled telephone integrated modules, terminal boards, power tools and so on.
PBT production methods are mainly ester exchange method and direct esterification polycondensation method, the catalyst used is titanate tetraisopropyl ester, titanate tetrabutyl ester, alkoxyzirconium, alkoxytin and so on.
(1) Ester exchange method: Ester exchange method adopts dimethyl terephthalate (DMT) as raw material, which is firstly ester-exchanged with 1,4-butanediol to produce dibutylene terephthalate, and then the latter is polycondensed to produce polybutylene terephthalate. The ester exchange method adopts the ratio of 1,4-butanediol in excess, the molar ratio of DMT and 1,4-butanediol is 1ː1.3~1.7, and the reaction temperature is about 200¡æ, which is conducive to the reaction equilibrium towards the generation of dibutylene terephthalate, and it can reduce the occurrence of side reactions. The second step of the polycondensation reaction is carried out at a temperature of about 250~260¡ãC and under reduced pressure to 0.1~1mm Hg. The ester exchange method can be carried out intermittently or continuously. The advantage is that the equipment is relatively simple, the reaction conditions are more moderate, step-by-step control of the ester exchange and polycondensation reaction is relatively easy, but the batch production, the efficiency is lower.
(2) Continuous direct esterification polycondensation method: continuous direct esterification polycondensation technology is more complex, due to the process materials are in a high temperature, high vacuum melting state, the equipment materials, equipment structure, material transport, reaction conditions are more complex to control. Therefore, a variety of patented technologies have been developed. The more famous ones are; Lurgi Zemmer technology, which is characterised by the use of esterification, pre-polycondensation and polycondensation of three reactors, the polycondensation reactor is a kind of horizontal disc reactor, a single production line can reach 120,000 tonnes/year scale. The product quality is high, and the by-product tetrahydrofuran can be directly used in the production of polytetrahydrofuran; Hitachi technology from Japan has four different types of reactors, which can simultaneously produce two kinds of products of high viscosity and medium viscosity. The scale of a single production line can be up to 60,000 tonnes/year; Uhde Inyenta Fischer technology adopts tower reactor, esterification and polycondensation can be completed in one reactor, which can produce PBT products with 20~35 degree of polymerisation, and if it is necessary to produce products with 80~150 degree of polymerisation, it can be moved to another horizontal polycondensation reactor called DISCAGE.
(3) Solid phase polycondensation process: the above process can only produce PBT products with polymerisation degree of about 100 and molecular weight of 20,000~35,000, which can meet the demand of textile and membrane products. For some engineering plastics products need polymerisation degree of 150~200, molecular weight of 40,000 above PBT, it is necessary to use solid-phase polycondensation process to manufacture. The solid-phase polycondensation process is a complex reaction, carried out in a solid-phase polycondensation reactor, which consists of four main processes to complete, namely, pre-crystallisation, annealing, reaction and cooling. It can be carried out intermittently or continuously.
Nanjing Suminoe Precision Machinery Co., Ltd. is a collection of scientific research, production, sales in one of the high-tech enterprises, and has always adhered to the integrity, equality, customer interests first business philosophy, in order to better improve the quality of the equipment, step into a more professional standardised production track. We set up a plastic sheet plate, casting, bi-directional stretching, non-woven nonwoven meltblown cloth, film composite, renewable granulation environmental protection and recycling system and coating machine manufacturing system and other seven categories of equipment, independent research and development technology centre and production departments. Provide a professional full set of technical solutions