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。     

酰胺型β成核剂对聚丙烯性能的影响

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FB-1,在提高聚丙烯耐热温度的同时有效提高聚丙烯的冲击强度,介绍β成核剂的复配及超细化,研究β成核剂含量对共聚聚丙烯EPS30R冲击强度的影响,考察β成核剂改性聚丙烯的加工稳定性及β成核剂改性共聚聚丙烯的结晶行为。结果表明,加入成核剂后,聚丙烯冲击性能显著提高,β晶型聚丙烯的热稳定性及反复加工性能良好,FB-1成核剂能有效促进聚丙烯中β晶型的形成,而且β成核剂只改变β晶型含量,不改变其微观结构,β成核剂对聚丙烯中的α晶型没有影响。     

高融熔指数共聚聚丙烯的研制开发

剖析进口料制定目标;把试生产的EP548R与进口料对比,确认基础树脂的质量;通过成核剂配方筛选,结合生产试验和客户反馈,选出最佳配方;把EP548R与竞争牌号性能对比。EP548R的刚性与进口料相当,韧性优于进口料。已经在客户中取代了进口料,稳定地供应市场。EP548R与国产料相比,表现出更好的刚韧平衡。     

有机化工与催化 酰胺型β成核剂对聚丙烯性能的影响

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FB-1,在提高聚丙烯耐热温度的同时有效提高聚丙烯的冲击强度,介绍β成核剂的复配及超细化,研究β成核剂含量对共聚聚丙烯EPS30R冲击强度的影响,考察β成核剂改性聚丙烯的加工稳定性及β成核剂改性共聚聚丙烯的结晶行为。结果表明,加入成核剂后,聚丙烯冲击性能显著提高,β晶型聚丙烯的热稳定性及反复加工性能良好, FB-1成核剂能有效促进聚丙烯中β晶型的形成,而且β成核剂只改变β晶型含量,不改变其微观结构,β成核剂对聚丙烯中的α晶型没有影响。     

高刚耐热聚丙烯树脂的制备

以牌号140聚丙烯树脂作为基料,使用高效成核剂生产出一种高刚耐热聚丙烯树脂。文中分析了制备高刚耐热聚丙烯树脂时,成核剂的种类和添加比例对改性PP(140)性能的影响。筛选出添加0.10wt%CHJ-3#成核剂制备的高刚耐热聚丙烯树脂力学性能最佳,其拉伸强度达到40.8 MPa,拉伸断裂标称应变为10.63%,拉伸断裂应力35.1 MPa,弯曲模量为1994.63MPa,邵氏硬度为71.9,悬臂梁冲击强度为3.33 k J/m~2,负荷热变形温度高达122℃。     

成核剂在改善聚丙烯冲击强度中的作用

探讨了一种既经济、又能规模化生产的提高聚丙烯冲击强度的新方法，简述了生产控制过程，以及成核剂在聚丙烯冲击改性中的机理和效果，提出了保持基础树脂MFR（熔体流动速率）及屈服拉伸强度不变（降幅不大）的情况下，提高PP的冲击强度的方法。     

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。     

成核剂对透明抗冲聚丙烯性能影响

以中试SpheripolⅡ工艺装置制备透明抗冲聚丙烯(EP08T),以EP08T为基料,研究了3种透明成核剂Millad NX8000(NX8000)、Millad 3988(3988)和NA-21对EP08T的光学性能、力学性能以及结晶行为的影响。结果表明：随着成核剂添加量的增大,所得样品的光学性能、冲击强度以及结晶温度(T_c)大幅提升,拉伸强度、弯曲强度以及弯曲模量略有改善,其中NX8000改善效果最佳。当NX8000添加量达到0.3%时,EP08T的光学性能以及冲击强度最好,NX8000-0.3的雾度可以降至12.8%,降幅超过60%,冲击强度可以达到24.6 kJ/m²,是EP08T的3.5倍。成核剂可以显著提高EP08T的T_c,缩短成型周期。当成核剂添加量为0.3%时,NX8000、3988和NA-21可分别将EP08T的Tc提高13.8、11.7和11.5℃,缩短样品的成型周期,提高加工效率。     

成核剂对聚丙烯力学性能与结晶行为的影响

研究了两种类型的成核剂对国产共聚聚丙烯的结晶形态以及拉伸强度、冲击强度的影响。结果表明:加入TMB-5型成核剂,聚丙烯的冲击强度有一定程度改善,w(TMB-5)为0.1%时,改性聚丙烯的缺口冲击强度达到最大;TMX-2型成核剂可改善聚丙烯的拉伸性能,但抗冲击性能降低较大;TMB-5型成核剂可显著地改变聚丙烯的结晶行为,诱导聚丙烯在结晶过程中主要形成β晶;TMX-2型成核剂可诱导聚丙烯在结晶过程中主要生成α晶,与纯PP相比,α晶的形成能力增强。     

成核剂在改善聚丙烯冲击强度中的作用

探讨一种既经济又能规模化生产的提高聚丙烯（ＰＰ）冲击强度的新方法;简述生产控制过程;成核剂在聚丙烯冲击改性中的机理和效果;在保持基础树脂的熔体流动速率、屈脂拉伸强度不变（降幅不大）的情况下,提高ＰＰ的冲击强度。     

Morphology and mechanical properties of injection‐molded ultrahigh molecular weight polyethylene/polypropylene blends and comparison with compression molding

The mechanical properties and morphology of UHMWPE/PP(80/20) blend molded by injection and compression‐molding were investigated comparatively. The results showed that the injection‐molded part had obviously higher Young's modulus and yield strength, and much lower elongation at break and impact strength, than compression‐molded one. A skin‐core structure was formed during injection molding in which UHMWPE particles elongated highly in the skin and the orientation was much weakened in the core. In the compression‐molded part, the phase morphology was isotropic from the skin to the core section. The difference in consolidation degree between two molded parts that the compression molded part consolidated better than the injection one was also clearly shown. In addition, compositional analysis revealed that there was more PP in the skin than core for the injection‐molded part, whereas opposite case occurred to the compression‐molded one. All these factors together accounted for the different behavior in mechanical properties for two molded parts. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

高熔指高抗冲共聚聚丙烯EP548R的开发与应用

文章阐述了高熔指高抗冲共聚聚丙烯开发的意义与重要性,主要介绍了高熔指高抗冲共聚聚丙烯的发展趋势及目前世界专利生产商所取得的技术进展成果,通过市场供求关系分析,洗衣机行业发展展望,调整生产运行装置,达到开发新产品EP548R的目的。此外,组织目标市场制样,收集反馈结果,调整生产推向市场。     

聚丙烯材料简支梁缺口冲击性能的时温效应研究

将聚丙烯(PP)树脂在一定注塑工艺条件下制备成用于简支梁冲击测试的样条,分别为ISO注塑A型缺口冲击样条和无缺口样条(然后通过铣缺口机机械加工成A型缺口冲击样条),通过摆锤冲击试验仪进行简支梁缺口冲击强度测试,研究共聚型PP材料注塑缺口和铣缺口冲击性能的时温效应。结果表明,共聚型PP材料铣缺口在标准环境下调节,简支梁缺口冲击强度基本无变化,机械加工内应力对其影响较小;注塑缺口在标准环境下调节,简支梁缺口冲击强度随着调节时间的延长先快速降低,后缓慢衰减;注塑缺口的冲击强度明显大于铣缺口的冲击强度;缺口冲击强度与温度成指数型增长。     

Co‐injection molding: Effect of processing on material distribution and mechanical properties of a sandwich molded plate

The effect of molding parameters on material distribution and mechanical properties of co‐injection molded plates has been studied using experimental design. The plates were molded with a polyamide 6 (PA 6) as skin and a 20% glass fiber‐reinforced polybutyleneterephtalate (PBTP) as core. Five molding parameters—injection velocity, mold temperature, skin and core temperature, and core content—were varied in two levels. The statistical analysis of the results showed that three parameters—Injection velocity, core temperature, and core content—were the most significant in affecting skin/core distribution. A high core temperature was the most significant variable promoting a constant core thickness, while core content was the most significant factor influencing a breakthrough of the core. Mechanical properties, such as flexural and impact strength showed a high correlation with the skin/core distribution. The slight increase in falling weight impact strength of the sandwich molded plates, compared to similar plates molded from PBTP only, could be explained from the failure process, which initiates in the brittle core and propagates through the ductile skins.     

液压脉动注射成型聚乳酸力学性能及生物降解性能的研究

在不同振动工艺参数下,研究液压脉动注射成型对聚乳酸(PLA)制品力学性能、结晶性能及生物降解性能的影响.结果表明,与普通注射成型相比,液压脉动注射成型的PLA制品拉伸强度提高了10.6%,冲击强度提高了29.7%,结晶度提高了11.9%.在蛋白酶K催化降解下,其生物降解过程是从表面侵蚀到内部整体侵蚀的逐步演变过程,制品总降解速率比普通注射成型的小.     

多次注塑HIPS的力学性能与化学结构的关联性研究

对两种不同牌号的高抗冲聚苯乙烯(HIPS)进行了多次注射成型,分别对各次注塑样品进行力学性能测试及13C-NMR分析。HIPS经过多次注射成型后,弯曲强度、伸长率、断裂强度、冲击强度等均有所下降。通过对HIPS中13C-NMR的吸收峰进行了归属,找出了HIPS经过多次注射成型后化学结构的变化规律,对HIPS的力学性能与化学结构之间的关联性进行了讨论。最后,提出了评价塑料加工稳定性的重复加工因子的概念。     

振动力场对聚丙烯/纳米碳酸钙复合材料性能的影响

采用自行研制的振动注射装置在注射保压过程中对聚合物熔体施加低频振动,成型了聚丙烯/纳米碳酸钙复合材料。对样品进行了力学性能测试并采用SEM对它的冲击断面进行研究。结果表明,采用振动注射成型装置可以使碳酸钙粒子在基体中的分散性得到改善。与常规注射相比,经振动注射后,复合材料的拉伸强度提高了17.6%,冲击强度提高了179.6%。     

聚酰胺12制品3D打印成型力学性能研究

应用3D打印技术中的熔融沉积成型法(FDM)和选择性激光烧结工艺(SLS)制备聚酰胺12(PA12)试样,研究了3D打印中构建不同取向方式对PA12力学性能的影响。同时,将3D打印试样与传统注射成型试样对比,比较了两者的性能差异。结果表明,FDM技术中构建不同打印取向影响PA12制品的力学性能,与注射成型相比,FDM试样的拉伸强度可达注塑件的56.3 %左右,断裂伸长率约为注塑件的60.9 %;SLS技术中,不同打印取向对制品的拉伸强度无明显影响,其拉伸强度可达注塑件的90 %以上,但其断裂伸长率较低,不足注塑件的10 %。     

聚丙烯注塑成型条件的优化

注塑条件的选择对注塑件质量及力学性能有着很大的影响。通过改变注塑速率、注塑压力、保压压力、模具温度及注射时间,找出了最佳的注塑条件,对于正确测定聚丙烯冲击强度和弹性模量等力学指标,客观反映该材料的力学性能具有重要的意义。     

Development of renewable resource–based cellulose acetate bioplastic: Effect of process engineering on the performance of cellulosic plastics

This paper deals with the development of a cellulose acetate biopolymer. Plasticization of this biopolymer under varying processing conditions to make it a suitable matrix polymer for bio‐composite applications was studied. In particular, cellulose acetate was plasticized with varying concentrations of an eco‐friendly triethyl citrate (TEC) plasticizer, unlike a conventional, petroleum‐derived phthalate plasticizer. Three types of processing were used to fabricate plasticized cellulose acetate parts: compression molding, extrusion followed by compression molding, and extrusion followed by injection molding. The processing mode affected the physicomechanical and thermal properties of the cellulosic plastic. Compression molded samples exhibited the highest impact strength, tending towards the impact strength of a thermoplastic olefin (TPO), while samples that were extruded and then injection molded exhibited the highest tensile strength and modulus values. Increasing the plasticizer content in the cellulosic plastic formulation improved the impact strength and strain to failure while decreasing the tensile strength and modulus values. The coefficient of thermal expansion (CTE) of the cellulose acetate increased with increasing amounts of plasticizer. Plasticized cellulose acetate was found to be processable at 170–180°C, approximately 50°C below the melting point of neat cellulose acetate.