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    December 14

    阻燃剂对阻燃PP的热变形温度影响机理讨论

    无机聚合物APP有提高PP的HDT的可能,它这时与滑石粉等无机物的作用是一样的。其实,只要是在PP中十溴/氧化锑阻燃体系也可以提高热变形温度。这个体系不仅是因为无机物氧化锑的存在,熔点高的十溴估计也发挥了矿粉一样的提高PP的HDT的作用。如果把十溴升高到其熔点以上,再将其分散到PP中,PP的HDT可能降低。由于八溴熔点低,可以分子水平分散到PP中,必将降低PP的HDT。

         热变形温度的提高解释为阻燃剂与PP等组分是一个各自独立的一部分,他们之间没有产生化学作用。如果把PP、阻燃剂、其他助剂看做一个独立的组成的话、阻燃剂也有HDT的话,那么他的HDT要高于PP,根据加和原理分析,总体的HDT显然要高于PP.

    附录 岳阳石化的IFR对阻燃PP的HDT的影响

    IFR - 2000 阻 燃 剂

    产品简介
    IFR-2000阻燃剂是一种以氮-磷为主要阻燃元
    素的无卤膨胀型阻燃剂,可用于聚丙烯、聚乙烯及其共聚物中。IFR-2000阻燃剂以热稳定性高的磷酸酯为主要组份,添加其它辅助组份复配而成;经表面处理产品与聚合物的相容性好,阻燃效率高。


    产品特点

    1、 热稳定性高
    2、 低烟、低毒
    3、 聚烯烃制品不熔滴、密度小
    4、 对材料性能影响小,具有优异的性能价格比

    产品指标





    外 观 粒度(目 堆密度(g/ml) 磷含量(%) 氮含量(%) 分解温度(℃)
    白色粉未 >400 0.41±0.05 15.0±0.5 24.0±0.5 >250℃


    应用于聚丙烯
    以聚丙烯粒料或粉料作基础树脂,其添加量与阻燃性能如下:



    IFR-2000(%) 20 25 28 30
    UL-94 V-2 V-1 V-0 V-0

    以T30S粒料作基础树脂,分别用IFR-2000与溴系阻燃剂其阻燃PP性能如下:


    性能指标 无卤阻燃PP 溴系阻燃PP* 纯PP(T30S)
    添加量(PP:阻燃剂) 72:28 68:32 100:0
    阻燃等级(UL94) V-0 V-0 燃烧
    融熔指数(g/10min) 3.3 3.2 2.9
    产品密度 0.986 1.33 /
    缺口冲击强度(kJ/m2) 5.5 4.0 4.9
    成型收缩率(%) 1.18 1.84 2.29
    拉伸强度(MPa) 29.0 28.0 35.7
    断裂伸长率(%) 13.6 14.8 367.1
    弯曲强度(MPa) 51.1 42.9 41.6
    弯曲模量(MPa) 2265 1641 1280
    悬臂梁冲击强度(kJ/m) 0.33 0.30 0.47
    热变形温度,℃(0.46Mpa) 143 131 123
    体积电阻(Ω) 2.4×109 2.2×109 7.0×1010
    表面电阻(Ω) 8.3×107 8.0×107 4.6×1010
    体积电阻率(Ω.cm) 7.5×1011 1.2×1012 3.9×1012
    表面电阻率(Ω) 2.7×1010 2.7×1010 3.8×1012
    介电常数 0.9 0.9 0.9


    * PP:十溴联苯醚:三氧化二锑 =68:22:10(wt)

    Comments (2)

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