阻燃高密度聚乙烯的研制

研制了阻燃高密度聚乙烯（ＨＤＰＥ）。讨论了含卤阻燃剂、无机阻燃剂、稳定剂、ＰＥ－Ｃ和不同分子量的基础树脂对阻燃ＨＤＰＥ的阻燃性和力学性能的影响。     

增韧聚丙烯三元共混体阻燃性能的研究

研究了多种阻燃剂，包括Ｓｂ２Ｏ３、Ａｌ（ＯＨ）３、ＣＰＣ、ＤＢＤＰＯ对聚丙烯／高密度聚乙烯／乙丙橡胶（ＰＰ／ＨＤＰＥ／ＥＰＲ）三元共混体—增韧聚丙烯—阻燃性能的影响；阻燃剂间的协同作用；并探讨了阻燃机理。结果表明：１、ＡＬ（ＯＨ）３的重量含量超过４０％时，阻燃效果显著；２、三种阻燃剂（Ｓｂ２Ｏ３、ＤＢＤＰＯ、ＣＰＥ）并用，阻燃效果明显提高，含卤化合物（ＤＢＤＰＯ与ＣＰＥ）是Ｓｂ２Ｏ３重量的四倍时，阻燃性能最佳；３、Ｓｂ２Ｏ３与ＤＢＤＰＯ并用时，当Ｂｒ／Ｓｂ的摩尔比为３∶１时阻燃效果最好     

改性PP三元共混体阻燃性能的研究

研究了含卤阻燃剂，十溴联苯醚（ＤＢＤＰＯ）；氯化聚乙烯（ＣＰＥ）和三氧化二锑（Ｓｂ２Ｏ３）及氢氧化铝对改性聚丙烯（ＰＰ）－聚丙烯／高密度聚乙烯／乙丙橡胶（ＰＰ／ＨＤＰＥ／ＥＰＲ）三元共混体阻燃性能的影响，分析了阻燃剂间的协同作用，讨论了阻燃机理，结果表明：（１）Ｓｂ２Ｏ３与ＤＢＤＰＯ、ＣＰＥ并用能改性ＰＰ三元共混体的阻燃性能提高，当含卤阻燃剂用量是Ｓｂ２Ｏ３的四倍左右时阻燃效果最好，阻燃性能提高一     

PP／PE共混物的拉伸力学性能

应用Ｉｎｓｔｒｏｎ材料试验机，考察了室温下聚丙烯（ＰＰ）与低密度聚乙烯（ＬＤＰＥ）和高密度聚乙烯（ＨＤＰＥ）共混物的拉伸力学性能．结果表明，ＰＰ／ＬＤＰＥ共混物的拉伸强度和弹性模量与组份的关系符合对数混合法则。而ＰＰ／ＨＤＰＥ共混物的力学性能与组份的关系则较为复杂。     

中国合成树脂及塑料文摘

ＨＤＰＥ／ＡＳ／共混体系形态及力学性能／魏秀萍（华南理工大学材料学院高分子系）／塑料工业。1999,2 7（4）：12～ 13转19。研究了相容剂ＬＤＰＳ ｇ ＡＳ对ＨＤＰＥ／ＡＳ共混体系形态及力学性能的影响。ＨＤＰＥ／ＬＤＰＥ在动态保压注射成型中的自增强行为研究／张弓（四川大学塑料工程系）／塑料工业。1999,2 7（4）：16～ 19。研究在ＨＤＰＥ中加入适量ＬＤＰＥ,经动态保压注射成型,试样的强度与模量得到明显的提高。同样,试样的韧性也较纯ＨＤＰＥ自增强试样明显增加。ＨＤＰＥ／ＬＤＰＥ（80 2 0 ）时,自增强试样的拉伸强…     

多元阻燃体系对HDPE的阻燃研究

本文研究了氢氧化铝，１，２－双三溴苯氧基乙烷，氧化锑三元复合体系对ＨＤＰＥ阻燃性能和拉伸性能的影响，还研究了在该三元体系中，加入ＣＰＥ时，ＨＤＰＥ的阻燃及拉伸性能的变化。实验结果表明，上述两阻燃体系均能使ＨＤＰＥ具有良好的阻燃性，但材料的伸强度和伸长率有一定程度的下降。     

共混方式对高密度聚乙烯/聚碳酸酯共混体系形态与性能的影响

研究了不同共混方式对高密度聚乙烯（ＨＤＰＥ）／聚碳酸酯（ＰＣ）共混体系形态与性能的影响。将不同组成的ＨＤＰＥ／ＰＣ分别在双螺杆、单螺杆挤出机中共混后注射成型,测试注射样条的力学性能并用扫描电子显微镜（ＳＥＭ）对样条断面进行形态观察。结果发现,共混方式对共混体系拉伸强度影响不大,但对冲击强度和断面形态影响较大。当ＰＣ含量低时,双螺杆的共混效果不如单螺杆;当ＰＣ含量较高时,双螺杆的共混效果优于单螺杆。     

淀粉填充聚乙烯共混物的特性研究

研究了淀粉填充对ＨＤＰＥ、ＬＤＰＥ和ＨＤＰＥ／ＬＤＰＥ共混体系性能的影响。结果表明，随淀粉量的增加，共混物的力学性能有较大的下降。当加入少量增容剂后，共混物的拉伸强度得到明显提高，并可高于无淀粉填充体系的拉伸强度；淀粉填充共混物的出口膨胀效应比纯聚乙烯的明显减少。     

共混改性聚乙烯管材材质的研究

以国产高密度聚乙烯（ＨＤＰＥ）为基础树脂，线性低密度聚乙烯（ＬＬＤＰＥ）为改性剂，采用共混改性的方法研制了聚乙烯管材，并对ＬＬＤＰＥ的含量影响拉伸强度，断裂伸长率等力学性能方面进行了实验研究。通过动态力学实验结果和透射电镜观察，分析了材料韧性与耐环境应力开裂性能之间的关系     

PC／HDPE共混材料的形态和性能

选用燕经公司生产的ＨＤＰＥ对双酚Ｐ型聚碳酸酯（ＰＣ）进行改性，研究了ＰＣ／ＨＤＰＥ共混材料的微观形态，流变性能，及ＨＤＰＥ加入量对ＰＣ力学性能的影响，并对ＰＣ／ＨＤＰＥ材料的阻碍机理进行了初步探讨。     

Effects of High-Energy Electron Beam Irradiation on the Properties of Flame-Retardant HDPE/EVA/Mg(OH)2 Composites

The mechanical properties of flame-retardant high-density polyethylene/ethylene vinyl-acetate copolymer/magnesium hydroxide (HDPE/EVA/Mg(OH)₂) composites for cable materials are usually poor due to the high loading of the filler. In this study, high-energy electron beam irradiation was applied to HDPE/EVA/Mg(OH)₂ composites in the presence of triallylisocyanurate, an irradiation sensitizer. The effects of high-energy electron beam irradiation on the properties of irradiated HDPE/EVA/Mg(OH)₂ composites were investigated through the measurements of gel content, limiting oxygen index, tensile testing, thermogravimetric analysis, and scanning electron microscope. The results showed that the thermal, mechanical and flame-retardant properties of the HDPE/EVA/Mg(OH)₂ composites were improved by using high-energy electron beam irradiation.     

辐照法制备无卤阻燃HDPE/EPDM/硅橡胶共混物

以氢氧化镁和红磷为阻燃剂,硅橡胶、三元乙丙橡胶(EPDM)为共混材料,高密度聚乙烯(HDPE)为基体制备了阻燃共混物,并对其进行电子束辐照,考察了阻燃共混物的力学性能、阻燃性能和微观形貌。结果表明:EPDM的加入明显改善了阻燃共混物的力学性能;硅橡胶的加入使得无机阻燃剂粒子在聚合物基体中的分散性提高,阻燃共混物的氧指(数OI)提高;辐照交联后,阻燃共混物的拉伸强度增强,OI明显提高,燃烧后的炭层更加致密。     

水滑石对IFR/HDPE复合材料的协效作用

利用熔融共混法制备了水滑石(LDH/)膨胀型阻燃剂(IFR/)高密度聚乙烯(HDPE)复合材料,并对复合材料的力学性能、阻燃性能、热稳定性能和燃烧炭层结构进行了研究。结果表明:LDH对复合材料具有明显的增强作用,在聚磷酸铵/丙三醇/三聚氰胺/HDPE体系中增强幅度最大;LDH能有效提高复合材料的氧指数,且在丙三醇和季戊四醇阻燃复合体系中能有效抑制熔滴和发烟量;LDH可以促进膨胀阻燃体系形成质密多孔炭层并,提高炭层的强度。     

矿业工程用HDPE阻燃材料的研究

以高密度聚乙烯（HDPE）为原料,十溴二苯醚－Sb2O3为主阻燃剂,硼酸锌－Mg(OH)2为辅阻燃剂制备矿业工程用HDPE阻燃材料。结果表明,所制备的HDPE阻燃材料具有力学性能高,阻燃性好等优点,适于制作矿业井下使用的某些制品。     

聚烯烃阻燃母粒的制造及应用试验

采用复合阻燃剂与聚烯烃通过挤出造粒法帛得聚烯烃（聚丙烯，聚乙烯）阻燃母粒，考察了聚烯烃阻燃母粒用量对阻燃聚丙烯，阻燃聚乙烯力学性能，流动性，阻燃性的影响,实验结果表明，聚烯烃阻燃母粒在生产阻燃聚烯烃帛品中具有使用便利，阻燃效果和经济效益好等特点。     

HDPE/Br-Sb/Mg(OH)_2低卤阻燃电缆料的研制

研究了由超微细Mg(OH)2和Br Sb卤素阻燃剂组成的复合阻燃体系以及两组分之间最佳的配比关系,通过采用氢氧化镁阻燃剂和复合阻燃剂对HDPE阻燃的对比实验结果表明:复合阻燃剂对HDPE热解性能、阻燃性能、物理机械性能的影响都优于氢氧化镁阻燃剂。     

电线电缆阻燃化研究现状

分析了电线电缆火灾的成因和危害;简要介绍了低烟低卤阻燃聚氯乙烯电线电缆料的发展现状和方向;重点介绍了低烟无卤阻燃聚烯烃电线电缆料的阻燃机理和研究现状;提出了阻燃剂的无卤化、抑烟和低毒是当前和今后电线电缆阻燃研究领域的前沿课题,但在阻燃电缆的应用上还需进一步深入研究。     

Preparation of expandable graphite using a hydrothermal method and flame-retardant properties of its halogen-free flame-retardant HDPE composites

This article reports a new way to prepare expandable graphite using a hydrothermal method. Natural flake graphite was added to a concentrated sulfuric acid and nitric acid mixture in a flask with mechanical stirring at room temperature. This was then placed in a Teflon-lined autoclave. The autoclave was sealed and quickly heated to the desired temperature, where it was maintained for 1 h before it was cooled to room temperature. The results showed that the expanded volume of EG obtained using the hydrothermal method was higher than those of EGs obtained through conventional liquid phase synthesis and ultrasound irradiation for the same acid concentrations in the mixture. X-ray diffraction patterns were used to analyze the structure and confirm that expandable graphite had indeed been prepared. A scanning electron microscope was utilized to observe the morphologies of the expandable graphite and expanded graphite. A cone calorimeter was used to investigate the flame-retardant properties of the halogen-free composites. The data show that the peak HRR values of the composites containing 30 wt% EG are dramatically lower than those of the pure HDPE resin and composites containing 30 wt% NG. The residual mass increases to 8.0 wt%, 30.1% and 37.6%, respectively, for pure HDPE, 30 wt% NG composites and 30 wt% EG composites. These results show that the HDPE/EG composite possesses excellent flame-retardant and thermal properties.     

Remarkable effects of silicone rubber on flame retardant property and mechanical properties of crosslinked high-density polyethylene/bio-based magnesium phosphate flame retardant (MHPA) composite

In this paper, a new bio-based flame retardant MHPA was prepared by the reaction of magnesium hydroxide (MH) and phytic acid (PA). Then the crosslinked high-density polyethylene (HDPE) flame-retardant composite was prepared by adding it and silicone rubber (SR) into HDPE and using electron beam irradiation. The test results of limiting oxygen index (LOI) and cone calorimeter test (CCT) show that the combination of MHPA and SR can increase the flame retardancy and smoke suppression performance of HDPE. The LOI of HDPE composite with 10 parts of SR is 28.3%, and its pHRR, THR and TSP values are reduced to 454.1 kW/m², 99.7 MJ/m² and 8.3 m², respectively, which is because MHPA and SR jointly promote the formation of continuous and high-density carbon slag in the combustion process of HDPE and inhibit the penetration of flame. In addition, the HDPE composite with 10 parts of SR has significant tensile strength, elongation breaking strength and tear strength, because SR can produce continuous stable structure with HDPE after irradiation and crosslinking. Therefore, this study verified that MHPA and SR together can effectively improve the flame retardancy, smoke suppression and mechanical properties of HDPE composite.