高光泽聚丙烯的研制

主要研究了无机填料对高光泽聚丙烯的影响。实验表明,填料的加入对聚丙烯的光泽度均有影响,影响最小的是硫酸钡。在高光泽聚丙烯中,硫酸钡用量增加,材料的熔融指数和冲击强度提高,光泽度、拉伸强度、弯曲强度和弯曲模量均下降。采用L9(34)正交表设计试验,得出表面改性剂对材料的光泽度影响最显著,极差为15.3,并得出了高光泽聚丙烯的最佳配方。     

多种无机填充材料在聚丙烯共混体系中的不同作用

着重讨论了轻质碳酸钙、重质碳酸钙、滑石粉、硅灰石、钛酸钾、硫酸钡和云母对聚丙烯和聚丙烯共混体系的影响。实验表明：对聚丙烯强度提高较大的是云母粉,对含有交联物的聚丙烯共混体系强度提高较大的是滑石粉,对冲击强度影响最小的是钛酸钾ＴＫ１,对光泽度影响最小的是硫酸钡,对耐热性提高较大的是轻质碳酸钙。     

彩色填充PP油箱护罩料的研制

选用滑石粉、碳酸钙、硫酸钡、高岭土、硅灰石五种矿物填料,对比本色填充聚丙烯(PP)预混料经高速混合机混合前后的颜色变化,再经挤出造粒制得黄色填充PP材料,对比测试熔体流动速率(MFR)、力学性能、颜色、表面光泽度及热稳定性。结果表明,经高速混合机混合10 min后,填料为滑石粉、碳酸钙、硫酸钡时预混料颜色基本与混合前保持一致,填料为高岭土、硅灰石时预混料颜色明显变深、变黑;填料为硫酸钡时材料的熔体流动性能及综合力学性能更符合通用机械油箱护罩用填充PP材料的技术指标要求,MFR为37 g/10 min,拉伸强度为23.6 MPa,悬臂梁无缺口和缺口冲击强度分别为81.4 k J/m~2和9.7 k J/m~2,热变形温度为109℃;填料为碳酸钙、硫酸钡时材料颜色鲜艳,与标准色板颜色最为接近;填料为硫酸钡时具有最好的表面光泽度;滑石粉、碳酸钙、硫酸钡三者比较,当填料为硫酸钡时填充PP材料的热稳定性略好。研制的黄色填充PP材料已应用于通用机械油箱护罩。     

无机填充材料在聚丙烯共混体系中的作用

着重讨论了轻质碳酸钙,重质碳酸钙,滑石粉,硅灰石,钛酸钾,硫酸钡和云母粉对聚丙烯和聚丙烯共混体系的影响,实验表明,对聚丙烯强度提高较大的是云母粉,对含有交联物的聚丙烯共混体系强度提高较大的是滑石粉,对冲击强度影响最小的是钛酸钾TK1,对光泽度影响最小的是硫酸,对耐热性提高较大的轻质碳酸钙。     

高光泽聚丙烯小家电专用料的研制

分析了成核剂对高光泽聚丙烯小家电专用料的光泽度和力学性能的影响.结果表明,成核剂协同效应具有提高聚丙烯小家电专用料性能、降低成本的作用,通过试验提出适合工业化生产的高光泽聚丙烯小家电专用料配方,即均聚聚丙烯树脂F401 100.00份、成核剂D 0.10份、抗氧剂0.20份,聚丙烯蜡0.30份.     

高光泽抗冲聚丙烯新产品成功试生产

正近日,中国石化"十条龙"攻关项目之一——高光泽抗冲聚丙烯在镇海炼化成功试生产。高光泽抗冲聚丙烯主要用于注塑成型,可用作洗衣机、微波炉等家电外壳和汽车内饰部件、玩具等产品的原料,特点是光泽度非常高,能够大大提高产品的美观度。镇海炼化与北化院密切合作,通过深入研究聚丙烯产品的微观结构及性能,攻克提升抗冲聚丙烯光泽度的关键技术难题,采用氢调法生产高光泽聚丙烯。该产品的粉料和     

机油尺保护罩用硫酸钡填充PP材料的研制

利用硫酸钡高熔点、高折射率特点,将其作为填充剂改性聚丙烯(PP)树脂,制备了硫酸钡/PP复合材料。研究了复合材料的相关物理机械性能、耐热性和表面光泽度。结果表明,在硫酸钡含量为20%时,复合材料具有较高的强度、耐热性和光泽度,能满足便携式发电机机油尺保护罩要求的耐热温度120℃,且高表面光洁度的使用性能要求。     

高光泽耐冲击聚丙烯树脂研究及工业化

利用高低温组合冲击实验机、万能材料试验机、光泽度仪、场发射扫描电子显微镜分析了普通耐冲击聚丙烯树脂的物理性能、光学性能及橡胶相微观结构。结果表明:普通耐冲击聚丙烯橡胶颗粒尺寸主要分布在0.4～1.4μm,光泽度(60°)在35.5%～70.2%。随着耐冲击聚丙烯中橡胶含量的提高及橡胶颗粒尺寸的增大,聚丙烯的光泽度会降低。研究通过调控聚丙烯均聚相及橡胶相的黏度,控制橡胶颗粒尺寸分布于0.1～0.5μm,开发出高光泽耐冲击聚丙烯产品,产品光泽度(60°)达90%,简支梁缺口冲击强度达4.3 kJ/m~2。     

高光泽度聚丙烯的研究

研究了成核剂、硫酸钡和偶联剂对聚丙烯(PP)性能的影响。采用正交试验,考察了润滑剂、降解剂、光亮剂和抗氧剂对PP光泽度的协同作用。结果表明:PP、硫酸钡、成核剂NX8000K、偶联剂、硬脂酸钙、降解剂、光亮剂、抗氧剂加入量分别为80.00,20.00,0.30,4.00,1.00,0.05,3.00,0.30份时,PP光泽度为最佳值(102°),达到了高光泽度的要求。     

纳米硫酸钡与β成核剂改性聚丙烯的性能研究

通过熔融共混的方法,制备了纳米硫酸钡和β成核剂改性聚丙烯,并详细研究了纳米硫酸钡和β成核剂对改性聚丙烯的拉伸强度、冲击强度及热变形温度的影响。结果表明:相对纯聚丙烯,用纳米硫酸钡或β成核剂改性的聚丙烯冲击强度和热变形温度都提高了,改性后聚丙烯的拉伸强度略有降低。与纯聚丙烯相比,采用纳米硫酸钡和β成核剂改性聚丙烯的热变形温度明显提高,其冲击强度在纳米硫酸钡质量分数低于5%时,高于纯聚丙烯的。     

Mechanical and thermal properties of talc and calcium carbonate filled polypropylene hybrid composites

The main aim of this work was to study and compare the mechanical and thermal properties of hybrid polypropylene (PP) composites and single‐filler PP composites. With two main types of mineral fillers—calcium carbonate (CaCO₃) and talc—PP composites of different filler weight ratios (talc/CaCO₃) were compounded with a twin‐screw extruder and then injection‐molded into dumbbell specimens with an injection‐molding machine. Tensile, flexural, and impact tests were performed to determine and compare the mechanical properties of the hybrid and single‐filler PP composites. A synergistic hybridization effect was successfully achieved; the flexural strength and impact strength were highest among the hybrids when the PP/talc/CaCO₃ weight ratio was 70:15:15. The nucleating ability of the fillers and its effects on the mechanical properties were also studied with differential scanning calorimetry. Because of the influence of talc as the main nucleating agent, the hybrid fillers showed significant improvements in terms of the nucleating ability, and this contributed to the increase in or retention of the mechanical properties of the hybrid composites. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3327–3336, 2004     

防划伤高光ABS/PMMA合金的制备及其性能探讨

以ABS为主要原料与PMMA共混来改善ABS的表面光泽度,添加无机填料TiO2和BaSO4来改善ABS/PMMA合金的表面硬度,探讨了PMMA和无机填料含量对ABS/PMMA合金力学性能、光学性能和硬度的影响。结果表明:合金的表面光泽度和硬度随着PMMA含量的增加而增大,但过多的PMMA会降低合金的冲击性能,当PMMA/ABS=30/70时,合金综合性能最佳;加入无机填料后,合金的表面硬度上升,表面光泽度、拉伸强度和冲击强度下降。     

成核剂对超微细滑石粉／聚丙烯共混物性能的影响

研究了α和β成核剂对滑石粉／聚丙烯共混物力学性能的影响。结果表明：α成核剂可以提高材料的拉伸强度、弯曲强度、弯曲模量和硬度等,冲击强度略有下降,而β成核剂使其韧性明显增强;α和β成核剂的加入皆使复合体系的耐热性显著提高,与β成核剂相比,β成核剂更能提高共混物的热变形温度。     

β成核剂对聚丙烯力学性能的影响

通过在抗冲聚丙烯基础树脂中添加自主研制的酰胺型高效β成核剂,在升高聚丙烯耐热温度的同时有效提高聚丙烯树脂EPS30R的冲击强度,研究酰胺型β成核剂PA-01、TMB-5和FB-1添加量对聚丙烯树脂EPS30R力学性能的影响,通过微观形态分析增韧的内在原因,并考察成核剂对聚丙烯树脂EPS30R的成核效果。结果表明,添加β成核剂后,聚丙烯的力学性能明显改善,且β成核剂诱导聚丙烯的成核效果较好。     

低模塑收缩率聚丙烯的研究

研究了空心微珠、纳米碳酸钙、碱式硫酸镁晶须和硫酸钡四种无机填料对PP的模塑收缩率的影响,通过与POE复配来改善PP的模塑收缩率,并考察了PP复合材料的力学性能。结果表明,无机填料与POE复配使用,可以明显降低PP的模塑收缩率,纳米碳酸钙、碱式硫酸镁晶须和POE复配效果最佳,模塑收缩率小于0．6％。     

环氧树脂-有机硅复合改性水性聚氨酯耐温防腐涂料的研究

以异氟尔酮二异氰酸酯(IPDI),聚丙二醇(PPG),二甲基硅油及环氧树脂等为主要原料合成了环氧树脂-有机硅复合改性水性聚氨酯,通过添加无机填料和助剂制备了水性聚氨酯涂料。利用红外光谱和热分析仪对乳液、涂料的结构和性能进行表征。探讨了乳液、镇水粉和铁红的用量对涂膜力学性能、耐水性能和防腐性能的影响。当乳液含量为65%,镇水粉含量为10%,铁粉含量为6%时,其热稳定性能提高了50℃,吸水率降低了3倍,冲击强度增加到80 kg/cm,附着力达到0级,自腐蚀电位提高至450 mV。结果表明,无机填料的加入,可极大改善水性聚氨酯涂层的综合性能。     

A New Approach to Improved Properties of Rubber Vulcanizates Containing White Molybdates

Incorporation of fillers in rubber results in a profound effect on rheological and mechanical properties of the formed composites. Fillers are customarily classified into organic and inorganic. The latter class includes calcium carbonate, talc, barium sulfate, kaolin, silica, etc. Molybdates are inorganic, nontoxic white pigments combined with reasonable pricing range and controlled solubility. The purpose of this study was to employ white molybdates and study their role as reinforcing fillers that can replace traditional carbon black, or semi-reinforcing furnance black (SRF), with both natural rubber (NR) and a blend of natural rubber-styrene butadiene rubber (NR-SBR), to show the modification of rheometric characteristics, tensile strength, strain at break, hardness, Young's modulus, swelling in toluene, thermal oxidative aging, and calculation of the rubber-filler interaction after the addition of such fillers.     

Polypropylene/linear low‐density polyethylene blends: Morphology,crystal structure,optical, and mechanical properties

The morphology, crystal structure, crystallization behavior, optical, and mechanical properties of isotactic polypropylene (iPP) blended with metallocene linear low‐density polyethylene (mLLDPE) and Ziegler–Natta linear low‐density polyethylene (zLLDPE), with and without nucleating agents, were investigated. The correlation between the structures and optical properties was investigated. The addition of linear low‐density polyethylenes (LLDPEs), nucleating agents, and poly(ethylene‐co‐octene) (POE) had little influence on the crystal form of the iPP. The growth along the b axis was favorable in the presence of nucleating agents and LLDPEs. The LLDPEs led to much finer crystal morphologies, and the nucleating agents further prohibited spherulite formation; consequently, light scattering from the bulk crystalline structure was reduced. In all blends, biphase morphology was observed, and POE could improve the adhesion between the iPP and mLLDPE. After blending with LLDPEs, the haze and stiffness decreased, and the gloss increased. mLLDPE enhanced the toughness whereas zLLDPE had a slight influence on it. The nucleating agents decreased the haze, increased the gloss more, and ameliorated the stiffness; however, they changed the toughness little. POE increased the toughness of the blend significantly, accompanied by a much lower haze, higher gloss, and almost the same stiffness. When the concentration of 1,3 : 2,4‐bis(3,4‐dimethyl‐benzylidene sorbitol) exceeded 0.25 wt %, the optical properties and mechanical properties leveled off. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009