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协效阻燃剂和增韧剂对无卤阻燃PC/ABS合金性能(4)
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摘要:表4 不同增韧剂下合金材料的UL 94阻燃等级试样厚度/mm试样编号7# 8# 9# 10# 11# 12#3.2 V-0 V-0 HB V-2 HB V-0 1.6 V-1 V-2 HB HB HB V-0 对比2#和7#试样,当阻燃剂种类一定时
表4 不同增韧剂下合金材料的UL 94阻燃等级试样厚度/mm试样编号7# 8# 9# 10# 11# 12#3.2 V-0 V-0 HB V-2 HB V-0 1.6 V-1 V-2 HB HB HB V-0
对比2#和7#试样,当阻燃剂种类一定时,基体中ABS的含量增加会降低材料的阻燃性能;对比7#和12#试样可以发现,增韧剂也会影响材料的阻燃性能,为了制备出综合性能优异的材料,阻燃剂和增韧剂应相互配合。综上所述,选用磷酸酯作为主阻燃剂、全氟丁基磺酸钾为协效阻燃剂、丙烯酸酯-有机硅共聚物为增韧剂,当ABS含量提高到15份时,PC/ABS合金材料的MFR为40 g/10 min,拉伸强度为48 MPa,缺口冲击强度为35 kJ/m2,阻燃等级(1.6 mm)达到UL 94 V-0级。材料具有较好的流动性、较高的韧性以及阻燃性能,满足通信设备外壳的性能要求。
3 结论
(1)在PC/ABS合金材料中全氟丁基磺酸钾和有机硅阻燃剂都与磷酸酯有协效作用,使材料的阻燃等级(1.6 mm)从UL 94 V-1级提升至UL 94 V-0级。全氟丁基磺酸钾对材料的拉伸强度和流动性能影响不大,但会使韧性有所降低。有机硅阻燃剂在提高材料阻燃性能的同时可以提高材料的缺口冲击强度和断裂伸长率,但会降低材料的流动性和拉伸强度。
(2)硼酸锌并不能和磷酸酯阻燃剂产生协效作用,三氧化二锑会和磷酸酯阻燃剂产生拮抗效应,降低材料的阻燃性能。
(3)丙烯酸酯-有机硅共聚物增韧效果低于烯烃类增韧剂,高于MBS,并且其阻燃性能明显优于其它增韧体系。
(4)选用全氟丁基磺酸钾作为协效阻燃剂,丙烯酸酯-有机硅共聚物作为增韧剂制备的无卤阻燃PC/ABS合金缺口冲击强度可以达到35 kJ/m2,并且阻燃等级(1.6 mm)可达到UL 94 V-0级。
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