一种基于PBAT/滑石粉的3D打印材料研制

以PBAT为基材,添加EVA-3、滑石粉和F300为改性剂,研究了滑石粉和F300用量对共混物力学性能和加工性能的影响。随着滑石粉含量增加,拉伸强度和断裂伸长率逐步降低,撕裂强度和熔体流动指数呈现先增加然后降低的变化趋势;当滑石粉含量为20%时达到最大值,分别为56N/mm和21g/10min。确定滑石粉含量为20%,研究F300用量对材料性能的影响:随着F300含量的增加,拉伸强度、断裂伸长率均逐步升高之后趋于稳定,撕裂强度和熔体流动指数先增加、然后降低,当F300用量为0.4%时撕裂强度达到最大值59.5N/mm。最佳配方为PBAT78.6%、滑石粉20%、EVA-31%、F300 0.4%,材料的拉伸强度19.8MPa、断裂伸长率1080%、撕裂强度59.5N/mm、熔体流动指数为21.5 g/10min。     

抗菌剂对滑石粉填充聚丙烯材料基础性能与散发特性的影响

利用熔融共混的方法制备了抗菌滑石粉填充聚丙烯(PP)材料,研究无机银离子抗菌剂含量对滑石粉填充PP材料力学性能、抗菌效果、耐划擦性能、长效抗菌性能和散发特性的影响.结果表明:添加1％(质量分数)的无机银离子抗菌剂,材料弯曲模量和缺口冲击强度略有增加,增加幅度约为5％;当抗菌剂添加质量分数超过0.7％时,抗菌效率均超过9...     

木粉/聚丙烯复合材料的力学性能研究

对PP基木塑复合材料配方进行了研究,采用正交试验方法,以木粉含量、偶联剂用量、PP-g-MAH用量、滑石粉用量和润滑剂用量为因素,以材料的各项力学性质及熔融指数为指标,进行实验,得到影响复合材料性能的各因素主次关系,优化了配比。实验结果表明:木粉填充量对复合材料力学性能综合影响最显著;硅烷偶联剂KH550和PP-g-MAH的加入均可以提高复合材料的力学性能,PP-g-MAH影响更显著;PE蜡用量对复合材料加工流动性影响较大;滑石粉对复合材料的断裂伸长率和冲击强度影响较显著,提高了材料的弯曲和拉伸强度;综合分析得配方优化方案木粉用量40份,KH-550用量1份,PP-gMAH用量9份,PE蜡用量2份,滑石粉用量6份。     

PCL抑菌改性及其在肿瘤放疗体位固定器3D打印中的应用

选择聚己内酯(PCL)为基材,添加滑石粉和纳米氧化锌进行改性,采用双螺杆挤出机在温度150℃、转速250 r/min条件下制备PCL抑菌改性材料,研究了滑石粉用量对材料拉伸性能和流变性能的影响以及纳米氧化锌种类对材料抑菌性能的影响。结果表明,随着滑石粉含量增加,材料的拉伸强度逐渐增大,熔体流动速率(MFR)和断裂伸长率呈现先增大然后减小的变化趋势;当滑石粉含量(质量分数)为10%时,MFR和断裂伸长率到达最大值,分别为2.69 g/10 min和813%;平衡扭矩随之呈现先降低后增加的变化趋势,当滑石粉含量为10%时到达最小值3.2 N·m。在此基础上添加4种纳米氧化锌制备PCL抑菌3D打印材料,发现粒径为20～30 nm的纳米氧化锌对金黄色葡萄球菌和大肠杆菌的抑菌效果最佳。得到的最佳配方为:PCL 85%、纳米氧化锌4%、偶联增容改性剂YY–5021 1%和滑石粉10%,材料的MFR为2.5 g/10 min、拉伸强度为19.3 MPa、断裂伸长率为803%。将制备的PCL抑菌改性材料用于体位固定器的3D打印,在打印温度220℃、填充度100%、填充打印速度40 mm/s、底板温度30℃的条件下打印出外观良好、尺寸精准的体位固定器,其在肿瘤放疗体位固定领域具有良好的应用前景。     

车用聚丙烯抗菌材料研制

以聚丙烯(PP)、聚烯烃弹性体(POE)、滑石粉、银离子抗菌剂为原料,制备了抗菌PP材料。考察了材料组分POE、滑石粉、抗菌剂含量对PP材料力学性能和抗菌性能的影响。结果表明,随着抗菌剂含量的增加,PP的力学性能变化不大,抗菌性能逐渐提高。与不加抗菌剂相比,添加0.4份抗菌剂的PP材料的金黄色葡萄球菌和大肠杆菌的抗菌性能值分别从5.7和5.5提高到6.8和6.6。随着POE含量的增加,PP材料的拉伸和弯曲强度降低,缺口冲击强度提高,抗菌性能逐渐提高。与不加POE的材料相比,当POE含量为20份时,金黄色葡萄球菌和大肠杆菌的抗菌性能值分别从6.1和6.0提高到6.8和6.6。随着滑石粉含量的增加,PP材料的弯曲弹性模量提高,缺口冲击强度和抗菌性能降低。与不加滑石粉的材料相比,当滑石粉含量为20份时,金黄色葡萄球菌和大肠杆菌的抗菌性能值分别从7.3和7.2下降到6.8和6.6。这说明提高抗菌剂和POE含量、降低滑石粉含量有利于提高抗菌效果。PP抗菌材料150℃热氧老化400h后仍具有优异的抗菌性能,可应用在汽车门板、手套箱、门槛饰板等汽车内饰零件。     

浇铸尼龙6/超细滑石粉复合材料的性能研究

采用超细滑石粉对浇铸尼龙6材料进行改性,对改性后复合材料的性能进行了研究。结果表明：在一定的配方组成下,超细滑石粉改性浇铸尼龙6复合材料与未改性前相比,尺寸稳定性、耐热性和热分解温度均有所提高,且光泽度基本保持不变,对浇铸尼龙6的应用普及有较大的实际意义。     

汽车工程用聚乙烯复合材料的改性处理及研究

通过在聚乙烯塑料中同时加入二氧化硅和滑石粉两种填充剂制备了可用于汽车工程的聚乙烯复合材料,并比较了不同含量的二氧化硅和滑石粉的综合作用以及其对聚乙烯复合材料性能的影响。结果表明:拉伸强度和断裂伸长率均随着二氧化硅含量的增加而减小,而弯曲强度随着二氧化硅含量增加而增加。相比于纯聚乙烯,二氧化硅和滑石粉的综合作用可以有效提高其热稳定性。并且随着二氧化硅含量的增加,材料的冲击强度、硬度均先增加后下降,并在50%含量时达到了最大值。与某汽车品牌材料的性能指标相比,制备的聚乙烯复合材料性能指标均具有一定的优异性,并且相比于纯聚乙烯具有较好的抗老化性。制备的聚乙烯复合材料可以应用于汽车工程材料之中。     

滑石粉填充聚乙烯母料的流变性能研究

采用毛细管流变仪研究了不同剪切速率下分散剂种类及用量、加工温度、滑石粉含量及粒径以及偶联剂含量对滑石粉填充聚乙烯母料流变性能的影响。结果表明,聚乙烯母料的流变曲线出现"剪切变稀"行为;聚乙烯母料的黏度随分散剂含量增加以及加工温度升高而降低;聚乙烯母料的黏度随母料中滑石粉含量增加而迅速增大;滑石粉粒径减小和偶联剂含量增加使聚乙烯母料的黏度略有下降。     

PBS/PLA/滑石粉3D打印线材制备及熔融沉积成型工艺研究

以聚丁二酸丁二醇酯(PBS)为基体,滑石粉和聚乳酸(PLA)为改性剂,采用熔融挤出法制备了PBS/PLA/滑石粉三维 （3D）打印线材,并对其进行了熔融成型研究。通过分析结晶性能、流变性能、力学性能、断面形貌和打印效果对PBS/PLA/滑石粉体系进行了探究。结果表明,PLA的加入使PBS的结晶温度下降了5 ℃;随着PLA含量的增加,材料的复数黏度、储能模量和损耗模量均得到提高;而拉伸强度则随PLA含量的增加下降了1.71 MPa,缺口冲击强度下降了2.63 kJ/m2;PLA含量的增加使断面逐渐粗糙;在打印效果上复合材料的打印模型随PLA含量的增加而变得美观规整,当底板温度高于110 ℃时,打印制件的翘曲度较低,同时拉伸强度随着打印温度的升高而增加。     

PP/SBS/滑石粉三元复合材料性能研究

通过熔融共混制备了不同滑石粉(经偶联剂KH550表面改性)用量的聚丙烯(PP)/丁苯热塑性弹性体(SBS)/滑石粉复合材料(PP与SBS的配比固定为90/10),同时研究了该复合材料的力学性能和流动性能。结果表明:随着滑石粉用量的增加,PP/SBS/滑石粉复合材料的弹性模量和拉伸强度下降;弯曲性能、冲击性能和熔体流动速率则先提高后降低,且均在滑石粉用量为10份时达到最大值;另外添加了改性滑石粉的PP/SBS/滑石粉复合材料,其拉伸强度、冲击强度和熔体流动速率均高于未改性滑石粉填充的复合材料。     

Influence of talc genesis and particle surface on the crystallization kinetics of polypropylene/talc composites

Talc is a laminar silicate, considered as an excellent nucleating agent for polypropylene (PP) crystallization. However, properties of PP/talc composites depend on the morphology, size, and surface of mineral particles. In this sense, talc from several ores, having different morphology, imparts specific characteristics on these materials. Also, taking into account that PP‐talc adhesion is not necessarily good due to the apolar character of PP, talc surface has been modified in order to increase this parameter. In this work, the effects of talc genesis, geomorphologic aspects, and particle surface characteristics on crystallization of PP/talc composites are analyzed. Isothermal crystallization of PP/talc composites was studied by using differential scanning calorimetry, based on Avrami model. The final crystalline morphology of talc‐filled PP was analyzed by means optical microscopy. The results show that the blocky talc morphology favors even more the crystallization compared to the platy one, at the same particle size. Taking into account the surface treatment studied in this work, the talc surface is made hydrophobic and the particle delamination is favored. As a consequence, so‐modified talc is very effective in increasing the crystallization temperature of PP and the nuclei number that grow during the crystallization with respect to the untreated talc. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Surface‐modified talc particles by acetoxy groups grafting: Effects on mechanical properties of polypropylene/talc composites

This article deals with the effects of surface‐modified talc particles on mechanical properties of polypropylene (PP)/talc composites. These materials were prepared by injection molding of PP blended with different concentrations of nontreated and treated talc, under the same processing conditions. Differential thermal calorimetry and scanning electron microscopy were used to assess thermal properties and morphology of the final composites. The reinforcing effect of talc, either treated or nontreated surface, on PP is analyzed through the tensile properties as a function of the mineral content (0–10 wt%). Morphological structure of composites revealed that the talc treatment improved the particle dispersion and distribution within the PP matrix and enhanced the interfacial PP‐talc adhesion. The mechanical properties of these composites, especially the Young modulus, tensile strength and elongation at break, were found to be improved respect to PP‐untreated talc ones. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers     

Mechanical,flow, and morphological properties of talc‐ and kaolin‐filled polypropylene hybrid composites

Polypropylene (PP) hybrid composites have been produced by compounding two types of mineral fillers, viz., talc and kaolin with PP copolymer using a twin screw extruder. The PP hybrid composite was injection‐molded into dumbbell specimen for tensile, flexural, and impact properties characterizations. MFI and SEM studies were used to characterize the flow and morphological properties of the PP hybrid composites. The result shows that most of the hybrid composites showed a significant decrease in flow, tensile, flexural, and impact properties compared with the single filler‐filled PP composites. However, a hybridization effect was seen for the PPT20K10 hybrid composites, through the synergistic coalescence of positive characteristics from 20 wt % of talc and 10 wt % of kaolin. This hybrid formulation have given an economically advantageous material with the mechanical properties (tensile, flexural, and impact) comparable to those of the talc‐filled PP composites. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 434–441, 2007     

Comparative study for the talc and two kinds of moroccan clay as reinforcements in polypropylene‐SEBS‐g‐MA matrix

Polypropylene (PP) or modified PP is one of the most commonly used synthetic polymers for the development of materials in construction, automotive, packaging, and other applications. However, improvements of inherent mechanical, thermal, and morphological properties are required to transfer its potential into reality. In this context, some comparative study with talc and Moroccan clay were performed to improve the inherent properties of modified PP i.e., PP‐SEBS‐g‐MA matrix composite of PP‐SEBS‐g‐MA with different loadings of talc and Moroccan clays. All the composites samples were prepared by melt mixing method. Thermal and Mechanical properties of the composite sample were higher than unreinforced samples. Improvement of crystalinity, thermal stability, and rigidity was observed in the composite samples due to incorporation of the filler. Highest young modulus was observed in case of talc filled PP composites. It's observed from Tsai‐pagano model results that the young's modulus of talc still higher than that of both clay particles, but using the density of fillers, the results in terms of specific properties shown that the specific rigidity is comparable. In summary, it was examined the ability of Moroccan clay particles, as an alternative filler for PP composite compared with the traditional commercial reinforcements such as talc and mineral calcium carbonate. POLYM. COMPOS., 36:675–684, 2015. © 2014 Society of Plastics Engineers     

The influence of filler treatment on the properties of TPU/PP blends: I. Thermal properties and stability

Commercially available organosilane (3‐glycidoxypropyltrimethoxysilane (GPTMS)) coupling agent was used to treat talc in order to improve the affinity relative between the filler and the polymer in composites as well as filler and polymer in the thermoplastic polyurethane/polypropylene (TPU/PP) blends (talc content was 5 wt%). The talc particles were first modified with GPTMS and then introduced into TPU, PP as well as TPU/PP blends with different weight ratios of polymers using blending method and subsequently injection molded in a hydraulic press. The aim was to report the effect of silane coupling agent on the thermal and morphological properties of talc filled composites and blends. The results showed that the thermal properties of the TPU, PP composites and TPU/PP blends were improved with the addition of silane treated talc (higher melting (T_m), crystallization (T_c) temperatures and degree of crystallinity (χ_c)). The glass transition temperature (T_g) obtained by dynamic mechanical analysis (DMA) of the TPU soft segments in TPU/PP blends increased with the addition of untreated and silane treated talc due to lower mobility of the soft segments in TPU and better miscibility of TPU and PP. TPU/PP blends with the silane treated talc show better thermal stability than the TPU/PP blends with untreated talc. POLYM. ENG. SCI., 55:1920–1930, 2015. © 2014 Society of Plastics Engineers     

Study of dynamically cured PP/MAH‐g‐PP/talc/epoxy composites

In the present study, an epoxy resin was dynamically cured in a polypropylene (PP)/maleic anhydride–grafted PP (MAH‐g‐PP)/talc matrix to prepare dynamically cured PP/MAH‐g‐PP/talc/epoxy composites. An increase in the torque at equilibrium showed that epoxy resin in the PP/MAH‐g‐PP/talc composites had been cured by 2‐ethylene‐4‐methane‐imidazole. Scanning electron microscopy analysis showed that MAH‐g‐PP and an epoxy resin had effectively increased the interaction adhesion between PP and the talc in the PP/talc composites. Dynamic curing of the epoxy resin further increased the interaction adhesion. The dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had higher crystallization peaks than did the PP/talc composites. Thermogravimetric analysis showed that the addition of MAH‐g‐PP and the epoxy resin into the PP/talc composites caused an obvious improvement in the thermal stability. The dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had the best thermal stability of all the PP/talc composites. The PP/MAH‐g‐PP/talc/epoxy composites had better mechanical properties than did the PP/MAH‐g‐PP/talc composites, and the dynamically cured PP/MAH‐g‐PP/talc/epoxy composites had the best mechanical properties of all the PP/talc composites, which can be attributed to the better interaction adhesion between the PP and the talc. The suitable content of epoxy resin in the composites was about 5 wt %. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006     

Intercalated structure of polypropylene/in situ polymerization-modified talc composites via melt compounding

Talc was modified with methyl methacrylate (MMA) or butyl acrylate (BA) via in situ polymerization. The talc/isotactic polypropylene (PP) composites with nano-sized intercalated structure were formed by melt compounding of PP with the modified talc. The results showed that the talc layers were partially delaminated, aligned along the flow direction, and uniformly dispersed in the PP matrix. The thickness of the PMMA-modified talc layers in the PP matrix was in the range 80-240 nm, while the PBA-modified talc was even thinner. PMMA or PBA macromolecules attached on the surface of talc layers hindered the crystallization of the PP component. Moreover, the aligned pristine talc layers promoted the orientation of the PP crystals. However, the extent of PP crystal orientation decreased in the presence of PMMA or PBA-modified talc.     

改性超细硅灰石材料在聚丙烯塑料中的应用研究

用各种改性剂对超细硅灰石粉体进行改性,通过双螺杆挤出机与聚丙烯进行混合改性造粒,在扫描电镜中观察了硅灰石与塑料的结合情况,对注塑试样测试并分析了相关性能,同时与滑石等其他无机粉体改性PP材料进行了对比,结果表明:硅灰石改性PP具有更好的力学性能和耐刮擦性能。     

滑石粉及其添加方法对聚丙烯材料结晶形态的影响

用X射线衍射技术研究了填充聚丙烯材料结晶形态的变化,结果表明:滑石粉对PP基体的结晶形态是有影响的,对PP基体结晶过程起异相成核作用,随滑石粉的原始粒径大小、填充量和表面处理程度变化而呈现不同的变化规律。     

Intercalation and exfoliation of talc by solid‐state shear compounding (S3C) using pan‐mill equipment

The intercalation and exfoliation of talc have been realized by solid‐state shear compounding (S³C) using pan‐mill equipment that can exert fairly strong shear forces and has multifunctions such as pulverizing, mixing, and activation on materials. The structural features of pan‐mill also show prospective in delaminating layered minerals. The morphology and structure of talc were investigated by using transmission electron microscopy (TEM) and X‐ray diffraction (XRD). The characteristic peaks of talc interlayer spacing disappeared in the XRD pattern of PP/talc composite prepared by S³C, however, still remained in the XRD pattern of PP/talc prepared by the conventional mixing method. TEM confirms the intercalated and exfoliated structure of talc, and the well dispersion of talc in the PP matrix after talc and PP were co‐milled. S³C is a new approach to prepare polymer/layered inorganic filler nanocomposite and has characteristics such as a simple process that needs neither organic ligands nor solvent. POLYM. ENG. SCI. 45:451–457, 2005. © 2005 Society of Plastics Engineers.