共查询到19条相似文献,搜索用时 156 毫秒
1.
2.
3.
4.
5.
6.
7.
聚氨酯泡沫塑料的阻燃 总被引:8,自引:0,他引:8
简要介绍了对多孔性材料聚氨酯泡沫塑料进行阻燃处理的重要性,并对各类阻燃剂的阻燃机理以及聚氨酯泡沫塑料阻燃研究领域的技术进展进行了介绍。较全面地综述了改善软质和硬质聚氨酯泡沫塑料阻燃性能的方法,包括:各种添加型阻燃剂和反应型阻燃剂的特点及使用效果,不同阻燃剂的协同作用,引入异氰脲酸酯基团提高硬泡阻燃性能,采用阻燃剂溶液浸渍开孔泡沫塑料等。 相似文献
8.
9.
10.
11.
Yuan Liu MeiFang Liu Daiyi Xie Qi Wang 《Polymer-Plastics Technology and Engineering》2013,52(3):330-334
Due to its “unzipping” degradation mode and poor compatibility with most other flame retardants, polyoxymethylene (POM) is the most difficult flame-retarded polymer among macromolecular materials. In this project, we took advantage of thermoplastic polyurethane (TPU) resin, which possesses good compatibility with POM, serving as an encapsulation layer, and the carrier resin of the nitrogen-phosphorus composite flame retardant melamine phosphate to achieve even and fine dispersion of the flame retardant particles in the POM matrix. The improved morphology of the dispersion phase can markedly modify the flame retardancy and good mechanical performance. Additionally, the encapsulation of TPU avoids direct contact of the flame retardant with POM, thus also advantageous to the enhancement of its material performance. Moreover, as an efficient formaldehyde absorbent and toughening agent, TPU itself can greatly improve the flame retardancy, thermal stability, and toughness of the flame retardant POM. Therefore, this method provides a simple and effective method to prepare flame retardant POM with good comprehensive performance. 相似文献
12.
针对三聚氰胺氰尿酸盐(MCA)粉体对尼龙(PA)进行阻燃改性时,MCA分散性差,材料阻燃性能不稳定的问题,运用特殊的包覆工艺成功制得了PA基MCA母粒。将制得的MCA母粒及MCA粉体分别与PA6或PA66共混挤出,制得阻燃PA材料。对比分析了MCA母粒及MCA粉体阻燃PA6或PA66的垂直燃烧性能和力学性能。结果表明,与MCA粉体相比,MCA母粒可在MCA含量较低的情况下使厚度为0.8 mm及1.6 mm的阻燃PA6或PA66试样的垂直燃烧等级达到V–0级。MCA母粒及粉体对阻燃PA6的弯曲强度和PA66的拉伸强度影响很小,MCA母粒阻燃PA6的拉伸强度较粉体阻燃的高,而阻燃PA66的弯曲强度低;MCA母粒使阻燃PA的缺口冲击强度降低,而MCA粉体对PA的缺口冲击强度影响较小,当MCA含量较低时,MCA母粒阻燃PA的缺口冲击强度明显高于MCA粉体阻燃的PA。制备的MCA阻燃母粒对PA的阻燃效果不受黑色母料的影响,且具有较好的阻燃稳定性。 相似文献
13.
14.
以乙烯-乙酸乙烯酯共聚物(EVA)为基体树脂,以氰尿酸三聚氰胺(MCA)为阻燃剂,研究了EVA/MCA复合体系的燃烧性能,并对燃烧炭层进行了分析.结果表明,MCA改善了EVA/MCA体系的燃烧性能,消除了燃烧滴落现象,抑制了黑烟的产生.随着MCA添加量逐渐增大,氧指数由18.0%提高到26.1%,当MCA添加量为80质量份时,体系成为难燃材料.当MCA添加量分别为50,60,80质量份时,EVA,MCA复合体系的阻燃级别依次可以达到FV-2级,FV-1级,FV-0级.随着MCA添加量的增加,燃烧试样表面的炭层逐渐增多,致密程度提高;随着燃烧时间的增加,燃烧试样内部的孔洞增多,孔径变大. 相似文献
15.
本实验选用一种新的方法合成改性三聚氰胺氰尿酸盐(MCA),将三聚氰胺(MA)、氰尿酸(CA)和极少量水混合成膏状物并使其在室温下反应一定时间,再加入少量MCA和二氧化硅(Si O2)溶胶使其继续反应以制备改性MCA(mMCA)阻燃剂。将制备的mMCA与尼龙6(PA6)熔融共混制备阻燃PA6复合材料。用FTIR、XRD和TG对所制mMCA进行了表征,对阻燃PA6复合材料的阻燃性能和力学性能进行了测试。结果表明:所制mMCA的FTIR、XRD特征峰与MCA的特征峰一致;m MCA的最大热失重温度有了较大的提升达到465.2℃。在PA6复合材料中,当阻燃剂含量为13%时,阻燃PA6复合材料的极限氧指数(LOI)达到33%,阻燃性能为UL-94 V0级,锥形量热测试的PHRR降低了26.3%。随着阻燃剂含量的增加,复合材料的力学性能有所提高。与传统大量水体系制备mMCA方法相比,此法具有工艺简单、不需加热、耗水量极低,没有污水排放等优点。 相似文献
16.
采用膨胀阻燃体系(IFR)对聚甲醛(POM)进行阻燃改性,研究了不同阻燃体系的阻燃效果、熔体流动速率和力学性能。结果表明,膨胀阻燃体系能显著提高POM阻燃性能,且POM/红磷/聚酯型聚氨酯/三聚氰胺尿酸盐=65/20/10/5时,综合效果最佳,可以达到离火自熄,点燃过程中形成的炭层明显,而且力学性能降低最少,加工性能最好,增容剂KT 3对体系的增容效果最明显,力学性能最佳。 相似文献
17.
聚磷酸铵基复合膨胀型阻燃剂的制备及其对聚甲醛的阻燃作用 总被引:6,自引:0,他引:6
针对聚甲醛(POM)阻燃的难点,在传统简单共混膨胀阻燃体系聚磷酸铵(APP)/三聚氰胺(ME)/季戊四醇(PER)的基础上,采用高温热反应处理技术将APP(酸源)、ME(气源)和PER(炭源)集成在一个大分子膨胀阻燃体系(RMAPP)中,并将所得大分子一体化产物RMAPP阻燃POM,解决了简单共混膨胀体系中各组分混合不均匀、难分散以及与基体树脂相容性差的难题。研究结果表明:高温热反应产物RMAPP比传统的未经热处理简单共混阻燃体系具有较好的阻燃效果,当阻燃剂RMAPP的添加量为45%时,在垂直燃烧测试实验中,其3.2mm厚试样可达到UL94V—1级别。 相似文献
18.
19.
In the present research, a nitrogen‐based flame‐retardant, melamine cyanurate (MCA) was surface‐treated with low‐molecular‐weight nylon through a solvent process to further improve its flowability and dispersion. The surface energy and flow energy of the modified MCA were investigated. The properties of polyamide 66 (PA66) prepared with surface‐treated and with conventional MCA were evaluated and compared. Because of lower surface energy and flow energy for modified MCA, its agglomeration degree and flow resistance are obviously decreased compared with conventional MCA, thus achieving finer and more homogenous dispersion in the PA66 matrix. Moreover, the low‐molecular‐weight nylon resin encapsulating MCA surface will melt at lower temperature during compounding with PA66; hence, it serves as a lubricant and carrier to further improve the flowability and dispersion of the flame retardants. Based on these advantages, the modified MCA flame‐retardant PA66 achieves much better flame retardancy, flowability, and mechanical properties compared with conventional MCA/PA66 under the same loading level of flame retardant (10 wt%). 相似文献