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瓶用透明PP专用料的研制 总被引:3,自引:0,他引:3
以不同牌号聚丙烯(PP)为基础树脂,通过添加成核剂及其他助剂制备了瓶用透明PP专用料。研究了基础树脂、成核剂种类与含量及其他助剂对PP透明性的影响。结果表明:共聚PP透明性优于均聚PP,高乙烯含量PP透明性优于低乙烯含量PP;HB系列成核剂的增透效果要优于Milleda3988等进口成核剂;随着成核剂含量增加雾度降低,当含量超过0.23%时,下降趋势变小且趋于稳定;其他助剂如分散剂B的加入提高透明性,硬脂酸钙的加入使透明性降低。DSC测试发现成核剂的加入使得PP结晶温度提高近20℃。经吹瓶实验,所研制专用料的加工性能、透明性以及瓶的强度、韧性均达到使用要求。 相似文献
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以煤基均聚聚丙烯(PP) 1102K为基体树脂,对比研究了透明成核剂Millad 3988与Millad NX8000对PP性能的影响.结果表明,成核剂添加量低于0.25%(质量分数)时,Millad 3988对PP雾度的改善优于MilladNX8000,而成核剂添加量高于0.25%时,Millad NX8000对PP雾度的改善优于Millad3988;两种成核剂对PP弯曲模量及热变形温度的影响程度相当;Millad NX8000对PP黄色指数的改善较大;在制成的设计有加强筋的板片上,加强筋处未出现真空气泡. 相似文献
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通过添加Millad3988对煤基均聚聚丙烯(Ci PP)进行透明改性,探讨了成核剂Millad3988的用量对光学和热学等性能的影响,考察了不同挤出温度对Ci PP的透明改性的影响。结果表明,成核剂Millad3988对煤基均聚聚丙烯的透明改性作用很明显,并且其热学性能也得到了提高,该成核剂的适宜添加量为0.3 phr;在实验加工温度范围内,挤出温度越高对Ci PP的透明改性越不利,说明适宜的加工温度对Ci PP的透明改性至关重要,本实验所得的适宜挤出温度为220℃。 相似文献
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成核剂在PP中的应用 总被引:9,自引:1,他引:8
介绍了成核剂的种类及其在国内外的研究开发进展,重点阐述了国内传统成核剂二苄叉山梨醇及其衍生物、有机磷酸盐类成核剂对PP透明性及力学性能的影响。在PP中添加成核剂不仅提高了PP的透明性,同时还可改善PP的力学性能 相似文献
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以聚丙烯(PP)为基体树脂,改性载银磷酸锆为抗菌剂,YS-688(二苄叉山梨醇衍生物)为成核剂,制备抗菌剂母粒、成核剂母粒和抗菌PP薄膜,研究了成核剂改性抗菌PP薄膜性能。结果表明:经YS-688改性的抗菌PP薄膜,球晶尺寸减小,结晶密度增大,结晶温度提高;含0.9%改性载银磷酸锆和0.3%YS-688的PP薄膜,其拉伸强度(纵向/横向)51.16/31.88MPa,透光率88.8%,雾度2.9%,对金黄色葡萄球菌和大肠杆菌抗菌率为99.26%和99.57%,物理力学性能和抗菌性能优良。 相似文献
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The application of some polymers as nucleating agents for polypropylene has been examined. Among various polymeric nucleating agents, polycyclopentene was found to be a superior nucleating agent to typical organic nucleating agents. When polycyclopentene was added to polypropylene, the crystallization temperature and the degree of crystallinity of polypropylene increased. In addition, the crystallization rate and the number of spherulites increased whereas the size of spherulites decreased remarkably. As a result of polycyclopentene addition, the transparency of polypropylene film could be improved considerably. © 1994 John Wiley & Sons, Inc. 相似文献
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复合成核剂对PBT结晶行为的影响 总被引:1,自引:0,他引:1
采用熔融共混法制备了聚对苯二甲酸丁二醇酯(PBT)和成核剂二苄山梨醇(DBS)或苯甲酸钠(SB)的共混物,通过差示扫描量热仪(DSC)、X射线衍射仪(XRD)、偏光显微镜(PLM)分析了各成核剂对PBT的结晶行为的影响,结果表明:添加任何一种成核剂均能明显改善PBT的结晶行为,即加快结晶速度、提高结晶度、细化晶体及完善晶体形态;其中复合成核剂要明显优于单一成核剂,复合成核剂中SB的影响程度要大于DBS。还采用热重分析(TGA)仪对体系的热性能进行了研究,发现成核剂的加入并未降低体系的热性能。 相似文献
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成核剂对增韧聚丙烯力学性能的影响 总被引:11,自引:0,他引:11
主要研究成核剂种类及用量对乙烯-辛烯共聚物(POE)增韧聚丙烯(PP)力学性能的影响。研究表明:随着成核剂NA1的加入,PP/POE共混物的透明性、冲击强度、弯曲强度、拉伸屈服强度均明显提高,研制的改性PP的透明性、韧性和刚性得到了平衡。 相似文献
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The radiation stability of the pre-irradiated copolymer of polypropylene containing 2.5 wt.-% ethylene units is compared with a copolymer of polypropylene with a nucleating agent with regard to radiation sterilization of medical devices. It is found that transparency property of the propylene-ethylene copolymer is improved through pre-irradiation processes. This finding was compared with the co-polypropylene with nucleating agent which also gives a better transparency property. In comparison, it is found that pre-irradiated copolymer exhibits better radiation stability during irradiation and during storage after irradiation. The radiation stability of the pre-irradiated copolymer is due to its lower crystallinity caused by the formation of branches during the pre-irradiation process. 相似文献
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不同成核剂成核聚丙烯的结晶行为与力学性能 总被引:12,自引:0,他引:12
制备了6种成核剂成核聚丙烯(PP)母料研究了成核母料和成核母料/PP的结晶,熔融行为,力学性能和透明性等物理性能,不同成核在成核母材料和成核母料/PP中对PP的结晶与熔融行为以及性能有不同的作用,观察到成核型A成核PP具有较高的结晶温度与综合性能,而成核剂B成核PP的透明性较好。 相似文献
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A new kind of rosin‐type nucleating agent for polypropylene (PP), the cocrystal of dehydroabietic acid, potassium dehydroabietate, and sodium dehydroabietate, was prepared, and the effects of the nucleating agents on the mechanical and crystallization properties of PP were also studied. The results of differential scanning calorimetry and X‐ray diffraction proved that the cocrystal of dehydroabietic acid and compound alkali dehydroabietate was formed rather than a simple blend of dehydroabietic acid and single alkali dehydroabietate. When it was added to PP, the size of the PP spherulite decreased; the mechanical properties, crystallization temperature, and transparency of PP were substantially improved. Thus, the cocrystal of dehydroabietic acid, potassium dehydroabietate, and sodium dehydroabietate acted as a more effective nucleating agent for PP. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 2137–2141, 2003 相似文献
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透明LLDPE膜专用料的研制 总被引:6,自引:0,他引:6
采用助剂配方后改性的技术方法,研制开发出生产透明线型低密度聚乙烯(LLDPE)膜专用料的助剂配方体系YS-1。YS-1为有机成核剂与无机成核剂的复配体系,该助剂体系具有无味、密度大等特点;用其改性生产的透明LLDPE专用料的雾度降至11%以下;膜的拉伸强度、断裂伸长率亦有所提高。此外,在透明LLDPE膜专用料助剂配方研制过程中发现:成核剂颗粒的大小及其尺寸分布是影响其增透效果的主要因素。 相似文献