BASF is headquartered in Ludwigshafen, with more than 350 branches and companies in 39 countries. Among them, there are more than 60 domestic manufacturers in Germany, respectively located in Ludwigshafen, Minster, Hamburg, Stuttgart, Mannheim, welzburg, Cologne and other cities. BASF Group headquarters and BASF joint stock company in Ludwigshafen are like a "small city", covering an area of 7 square kilometers.
It is characterized by good acid resistance, good salt resistance, high temperature resistance to water and salt, high temperature resistance to water and salt, good resistance to water and salt, good resistance to water and salt, good resistance to water and salt Use, but not resistant to strong acid and alkali. It is resistant to carbon tetrachloride, and swells in dichloroethane, some in aromatic hydrocarbon and acetic acid. Among the modified PBT, 92% is reinforced by glass fiber, and the properties of the modified PBT are outstanding: ① excellent heat resistance, long-term service temperature of 125 ℃, short-term service temperature of 210 ℃; ② high mechanical strength, small deformation under long-term high load; ③ low water absorption, good dimensional stability and excellent friction and wear resistance
Types of PBT: 10% glass fiber reinforced, 20% glass fiber reinforced, 30% glass fiber reinforced, flame retardant, mineral filling, glass mineral mixing, high temperature resistance, glass fiber fire resistance, hydrolysis resistance, lubricant addition, heat stabilizer addition, ultraviolet resistance, food grade, thermal conductivity level, high flow.
Overview of PBT development: in the early 1970s, PBT was successfully researched by Celanese company of the United States, and was listed under the trade name of celanex. Subsequently, world famous manufacturers such as BASF, Bayer, Ge, Ticona of the United States, Toray and Mitsubishi Chemical of Japan, new optical fiber of Taiwan, Changchun artificial resin and South Asia plastic materials were successively put into production. There were more than 30 global manufacturers. PBT can also be called thermoplastic polyester plastics. In order to be suitable for different processing industries, additives are usually added or mixed with other plastics. With the different proportion of additives, different specifications of products can be manufactured. At present, there are more than 100 specifications in the island, so PBT is a product with less quantity and more specifications.
PBT加工之前必须要行干燥处理、要将水分含量控制在0.03%以下。
PBT采用热风循环干燥时,PBT当温度为110℃、115℃或145℃时,所对应的时间不**过六小时。料层厚度低于32mm。
PBT温度:PBT的分解温度为285℃,所以实际生产中控制在235-265℃:
PBT压力压力为52~102MPa。
PBT速率 PBT冷却速度快,因此要采用较快的速率。
螺杆转速和背压成型PBT的螺杆转速不宜**过80r/min,在25~62r/min之间。
背压为压力的12%~17%。PBT模具温度在65~82℃,各部位的温度差不**过12℃。PBT成型时间一般情况下为18~62s。
PBT被广泛用于电子电器领域应用占PBT的总生产量的百分之五十:电脑/电器接插件、接触器、线圈骨架、连接器、继电器、熔断器、调节器、温控开关、温控保护器、装饰灯座、开关插座、电磁炉底盘、电暖器出风口、散热扇翼、变压器线圈骨架、高电压大电流的高压断路开关骨架、电脑风扇、节能灯灯头、电器开关、电子镇流器外壳、电吹风、电烤箱、电饭煲、微波炉、水泵配件及电动工具配件等;PBT汽车领域的应用占PBT的总生产量的百分之三十:主要用于高压无触点点火器的分电器盖、转子、点火线圈盖、接线端子、传感器盒、前后灯座、集成电路盒、微电机后盖、冷气风扇等,PBT通讯领域应用占PBT的总生产量的百分之二十,主要用于程控电话的集成模块、接线板、电容器外壳、天线护套等.
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