宝理PBT 2016
PBT日本宝理一级代理商长期供应供应PBT性能、40%玻纤增强PBT、15%玻纤增强PBT,、30%玻纤增强PBT、20%玻纤增强PBT、15%玻纤增强阻燃PBT,、30%玻纤增强阻燃PBT、20%玻纤增强阻燃PBT、抗疲劳PBT、耐老化PBT、耐化学性PBT、增韧PBT、高刚性PBT. 具有耐热性PBT、耐候性PBT、耐药品性PBT、电气特性佳PBT、吸水性小PBT
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1. Introduction |
Polyphenylene sulfide (PPS) is a crystalline engineering plastic possessing a molecular structure of benzene rings linked with sulfur atoms. The melting point of PPS is 280-290℃ and it can be utilized continuously at a temperature of 200-240℃. This outstanding heat resistance classifies the resin as an advanced engineering thermoplastic (ETP). PPS also exhibits excellent mechanical properties and dimensional precision, while the resin itself exhibits flame retardance. In addition, there are no organic solvents that can dissolve PPS at a temperature of lower than 200℃. The resin has chemical resistance on a par with fluororesins. |
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供应DURANEX® PBT日本宝理320NF
供应DURANEX® PBT日本宝理3300H
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供应DURANEX® PBT日本宝理2000
供应DURANEX® PBT日本宝理2002
供应DURANEX® PBT日本宝理3216
Nowadays, moves to avoid materials containing halogenated flame retardants for use in IT devices such as smartphones and personal computers are gaining traction centered on the efforts of Western manufacturers and many cases are emerging where grades of PPS containing low levels of chlorine are sought.
Conventionally, PPS is synthesized using the process shown in Figure 1. Para-dichlorobenzene is used as a feedstock and this normally results in 500-5,000 ppm of chlorine remaining in the final product in the forms of residual chlorine at the polymer chain ends and byproduct sodium chloride. As long as the process in Figure 1 is used to manufacture PPS, one can predict that productivity would decline if attempts were made to drastically reduce the level of chlorine in the PPS and costs would also increase dramatically through the addition of process steps. Consequently, the consensus is that it would be very difficult to achieve a chlorine level of less than 900 ppm that would satisfy market needs.
