Shanghai Daoqin Plastics Co., Ltd.

thermoplastic polyurethane (TPU) (PUR-T) as is types engineering plastics, its excellent physical properties, chemical resistance, wear resistance, for chemical product good force and lubricated property can to 广泛 关注. currently, it can substitute/replace soft polyvinyl chloride (PVC), meet/satisfy day growth field/area environmental protection requirements. therefore, it in industrial and day active in 扮演 越 越 important color. in 一定程 degree upper, its can property, property and process in generate a large amount of has gas 体, large increase 火灾危险 property, made its application, therefore improve/increase its flame retardant property can non important. poly acid 铵(APP) tool has chemical stability property good, gas low, property small, use process in generate property and property gas and other chemical features, due to 磷(P) and nitrogen (N) content high, can to flame retardant function, however APP can as is acid 源, carbon 源, meanwhile APP add 入会导致 composite/compounding material force property can decline, this large made APP application.

北京 chemical industry large Di and other through surface grafting methods use silicon coupling agent for powder (BF)进行 surface modified, meanwhile will modified BF and APP复配 flame retardant PUR-T. due to APP and BF-KH550构 formed flame retardant system (IFRs), flame retardant property can more excellent 越. in flame retardant system in silicon coupling agent modified BF has causes: 一 is flame retardant system carbon 源, make its tool has more more 残炭; is silicon 元素 引入 is is to carbon 层致密 效果; is silicon coupling agent modified BF can improvement flame retardant add 入导致材 material force property can decline issues.

flame retardant PUR-T composite/compounding material made 备

will PUR-T, APP以 and BF-HK550于80℃烘箱 in lower 燥24 h, will quality APP, BF-KH550 and PUR-T mixed combined uniform, use micro type di screw extrusion machine will flame retardant and 基体进行熔 melt blending, material temperature degree, extrusion temperature degree and material temperature degree separation setting is 170, 175, 180℃, extrusion material pellet cutting rear pressure sheet/slice, hot pressure temperature degree setting is 185℃, will made sheet/plate made formed standards strip/profile flame retardant property can testing, tensile Sample strip/profile through injection molding machine injection molding. will pure PUR-T, PUR-T 90%／APP10%, PUR-T 90%／APP 8%／BF 2%, PUR-T 90%／APP 8%／BF-KH550 2% sample separation 别标记 is 0#, 1#, 2#, 3#.

LOI and 垂直燃烧(UL 94) testing and analysis

由 table/sheet can 知, pure PUR-T LOI is 21.6%, has through UL 94 and other grade, mono add 入10% APP rear, 1# composite/compounding material LOI improve/increase to 27.4%, UL 94 can to V–0 and other grade. add 8% APP and 2% BF时, LOI is 28.5%, UL 94 maintain V–0 and other grade 不变, 但几乎 can to self-extinguishing. 而APP and BF-KH550复配时, LOI进一步 improve/increase to large 于30%, can to self-extinguishing V–0 and other grade, flame retardant property can 进一步 improve/increase.

锥形 amount hot testing and analysis

由 table/sheet can 知, 含IFR PUR-T composite/compounding material time (TTI) small pure PUR-T 28 s, 1#, 2# and 3# sample separation is 19, 16, 18 s. this is due to APP and BF can can promote PUR-T degradation, 导致PUR-T提 front 火. is 进一步 understanding its 火灾危险 property, according to amount hot data 计算火灾 property can 指数(FPI), 计算结果 is FPI =TTI／pHRR. usually, relatively high FPI value more has flame retardant property. can 看出, 3# sample FPI value most high, its safety water most high. upper table/sheet can 知, pure PUR-T consumption oxygen amount (TOC) is 52.84 g. 1#, 2# and 3# composite/compounding material TOC significantly reduce is 39.45, 35.07, 35.49 g, 2# sample TOC most low.

force property can analysis

由 table/sheet can 知, pure PUR-T tensile strength (Ts) and fracture elongation (Eb) separation is 24.5 MPa and 1 129.6%, 1# sample Ts and Eb separation is 15.3 MPa and 946.7%. due to APP and PUR-T versus property relatively 差, APP in can 避免 会导致 composite/compounding material force property can decline. in add 入8% APP and 2% BF–KH550时, Ts and Eb均 has increase. in addition, 3# Sample tensile strength is 23.9 MPa, its force property can excellent 于2# Sample, is due to BF-KH550 in PUR-T in dispersion property to improvement, 进一步 improve/increase its force property can. in addition, 3# Sample tensile strength is 23.9 MPa, and 2# Sample versus ratio, its tensile strength improves 9.6%, is is due to BF-KH550 in PUR-T in dispersion property to improvement, 进一步 improve/increase its force property can.

结论

(1) 8% APP and 2% BF-KH550 add 入, PUR-T composite/compounding material oxygen index (LOI) to 30.3%, 垂直燃烧 and other grade to V–0.

(2) and modified BF versus ratio, KH550 modified BF make PUR-T composite/compounding material hot speed rate value reduce 86.6%.

(3) BF surface modified make PUR-T composite/compounding material force property can has improves, relatively modified BF, its tensile strength improves 9.6%.