抗静电无卤阻燃矿用电器外壳材料聚丙烯的研制

以聚丙烯(PP)为基体材料,加入无卤膨胀型阻燃剂SR、抗静电剂制备了矿用电器外壳材料,考察了阻燃剂、抗静电剂对PP性能的影响;通过对比失重率及阻燃性能,考察了材料的耐水解性能。结果表明,阻燃剂SR的加入能提高PP的阻燃性能,当阻燃剂质量分数达到20%时,材料阻燃性达到FV–0级,同时阻燃剂的加入使材料力学性能下降;残炭扫描电子显微镜图片显示,在燃烧过程中,阻燃剂SR促进PP基材形成封闭蜂窝状炭层并且膨胀隆起成球状,可以有效地阻止热量和氧气的传播,从而达到优异的阻燃效果;抗静电剂129及抗静电剂163的加入能提高PP的抗静电性能,当两者复配使用且质量比为2∶1时,材料表面电阻率降低至1.5×108Ω;传统膨胀型阻燃体系在热水浸泡后阻燃性能降至FV–2级,而加入SR的PP阻燃体系则能保持FV–0级。     

塑料用涂料

嵌段树脂及其制备和含该树脂的颜料分散体；适用于凹版印刷涂覆方式的聚酯膜用底涂涂覆剂组合物及其制备方法；用于非曝露表面用溶剂型可固化涂料的材料及其耐划伤涂料和涂膜；用于非曝露表面用水稀释型可固化涂料的材料，其耐划伤涂层材料和涂膜；光透过性树脂产品用染色性好的涂料组合物     

低散发耐刮擦汽车内饰用聚丙烯复合材料的研制

采用熔融挤出法制备了一种低散发耐刮擦汽车内饰用聚丙烯(PP)复合材料,研究了不同用量的耐刮擦剂和气味吸附剂对PP复合材料耐刮擦性能和气味散发特性的影响.结果表明,当耐刮擦剂和气味吸附剂的质量分数分别为1.5％和1％时,PP复合材料具有较优异的耐刮擦性能和低气味散发特性,且其力学性能不受影响.该复合材料已成功应用于各种汽车内饰件.     

耐划伤剂对车用聚丙烯材料耐划伤和散发性能的影响

采用熔融共混挤出的方法,制备了聚丙烯/滑石粉/弹性体三元共混材料,并考察了两种耐划伤剂对材料耐划伤性能、散发性能和力学性能的影响。采用十字划伤仪和色差仪对材料在常温和热老化(102℃,168 h)条件下的耐划伤性能进行了评价;采用气味评定、顶空–气相色谱、挥发性有机化合物(VOC)袋子法以及雾度仪分别对添加两种耐划伤剂后材料的气味、总挥发性有机化合物(TVOC)以及VOC和雾度进行了测试。结果表明,采用酰胺类和有机硅类耐划伤剂可改善聚丙烯材料表面的耐划伤性能,常温下两者效果相当,但热老化后前者耐划伤性能消失,而后者仍具有良好的耐划伤性能。在散发性能方面,采用有机硅类耐划伤剂在气味等级、VOC、雾度等方面均优于酰胺类划伤剂。相对于酰胺类耐划伤剂,添加有机硅类耐划伤剂的材料韧性和熔体流动速率有所提升。通过使用有机硅类耐划伤剂制备了在耐划伤性能和散发性能上均满足材料要求的汽车零部件。     

耐划伤车用聚丙烯材料的研制及应用

研究了耐划伤剂、滑石粉粒径对聚丙烯(PP)材料耐划伤效果与力学性能的影响,通过测试划伤前后的色差来评价耐划伤剂对材料的耐划伤效果.结果表明,耐划伤剂增加了材料的表面润滑性;采用小粒径滑石粉改性材料的耐划伤性能优于采用大粒径滑石粉改性的材料.利用耐划伤PP开发出的汽车内饰件被成熟应用于通用NGS308车型.     

免喷涂幻彩PP/PETG合金料的制备

免喷涂PP/PETG合金材料制备方法,包括如下质量份数的各组分:均聚PP树脂60-90份、共聚PP树脂25-45份、PETG树脂5-15份、幻彩珠光母粒4-10份、POE增韧剂4-8份、偶联剂1-5份、定向排列剂1-5份、抗氧剂0.3-1份、相容剂Ⅰ3-5份、润滑剂1-2份、相容剂Ⅱ2-5份、耐候剂0.5-1.5份。其制备方法包括两个步骤制成:1、按配方要求重量混合在连续性密炼机中制成幻彩珠光母粒;2、按配方要求在低剪切螺杆配合侧喂料挤出造粒,制成具有幻彩效果的免喷涂PP合金材料。     

车用聚丙烯内饰材料耐划伤性能研究

采用衰减全反射红外光谱(ATR)研究酰胺类耐划伤剂在车用聚丙烯(PP)耐划伤内饰材料表面和内部的含量分布.ATR及十字划格实验结果表明,酰胺耐划伤剂能有效地迁移到材料表面,降低表面摩擦系数,且酰胺耐划伤剂在材料表面和内部的分布有所差异.ATR及扫描电子显微镜(SEM)证明车用PP耐划伤内饰材料呈皮芯结构,未加入耐划伤剂...     

专利

具有优异耐光照老化性能的PP复合材料及其制备方法公开号:CN101210088公开日:2008-07-02申请人:上海普利特复合材料有限公司摘要本发明公开了一种具有优异耐光照老化性能的聚丙烯(PP)复合材料及其制备方法。材料质量分数组成为:PP55%～95%,无机填料0～40%,增韧剂POE0～20%,分子     

汽车用耐刮擦改性聚丙烯的研制

制备了汽车用耐刮擦改性聚丙烯(PP),分析了不同耐刮擦滑爽剂、矿物填料、PP结晶度及增容剂等对材料耐刮擦性能的影响。结果表明,采用高结晶PP、较小粒径的矿物填料和反应型高聚硅氧烷制备的改性PP具有优异的耐刮擦性能,完全适用于汽车零部件。     

从铝粉优选角度谈免喷涂外观缺陷改善

金属光泽免喷涂塑料产品由于其独特的优势而具有广阔的应用前景,其中铝颜料是目前用量最大且最具有代表性的免喷涂颜料。但由于金属与高分子树脂基体天然的差异性以及铝粉不同的形貌特征等等,添加铝粉的金属光泽免喷涂制件往往会出现熔接痕、流痕等外观缺陷,应该如何更适宜的选择铝粉是一个行业难题。本文从铝粉形态的选择,铝粉粒径的选择以及铝粉径厚比的选择三个维度,探讨了铝粉的优选及其对免喷涂塑料产品外观缺陷改善的情况。     

聚丙烯耐划伤性的研究进展

综述了聚丙烯(PP)材料表面耐划伤性能的研究进展,重点讨论了填料、填料与PP基体间的界面强度、成核剂、润滑剂、分子结构、共混改性等因素对PP表面耐划伤性能的影响。针对耐划伤PP材料的开发和划伤机理的研究,还需构建数学模型为其提供依据和指导。     

Roles of additives in scratch resistance of high crystallinity polypropylene copolymers

Scratch behavior in neat and talc‐filled high crystallinity polypropylene (PP) copolymers containing various additives is investigated using a cosntant load scratch test and two types of indentation tests (Rockwell and Shore D). The talcfilled PP copolymer exhibits high scratch visibilityand scratch depth. The addition of a nucleating agent or lubricant improves the scratch resistance of the talc‐filled PP copolymer. Differential scanning calorimetry, scanning electron microscopy and attenuated total reflectance Fourier transform infrared spectroscopy are used to characterize crystallinity morphology and scratch mechanisms in PP systems. It is found that the scratch resistance of the PP copolymer systems investigated, in terms of scratch depth and scratch visibility, depends mainly on the fracture features generated during the scratch process. The influences of talc, nucleating agent and lubricant on the scratch behavior of PP are discussed.     

Effect of the delignification of wood fibers on the mechanical properties of wood fiber–polypropylene composites

The effect of the delignification of hornbeam fibers on the mechanical properties of wood fiber–polypropylene (PP) composites was studied. Original fibers and delignified fibers at three levels of delignification were mixed with PP at a weight ratio of 40:60 in an internal mixer. Maleic anhydride (0.5 wt %) as the coupling agent and dicumyl peroxide (0.1 wt %) as the initiator were applied. The produced composites were then hot‐pressed, and specimens for physical and mechanical testing were prepared. The results of the properties of the composite materials indicate that delignified fibers showed better performance in the enhancement of tensile strength and tensile modulus, whereas the hardness of the composites was unaffected by delignification. Delignified fibers also exhibited better water absorption resistance. Notched impact strength was higher for delignified fiber composites, but it was reduced at higher delignification levels. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 4759–4763, 2006     

Investigating polypropylene–green coconut fiber composites in the molten and solid states through various techniques

A series of polypropylene (PP)–green coconut fiber (GCF) composites were prepared by melt mixing and their properties studied in the molten state using an advanced nonlinear harmonic testing technique, and in the solid state using standard mechanical testing and scanning electron microscopy (SEM). The effect of fiber loading as well as the role of maleated polypropylene as compatibilizing agent was investigated. PP–GCF composites are heterogeneous materials that, in the molten state, are found to exhibit essentially a nonlinear viscoelastic character, in contrast with the pure PP, which has a linear viscoelastic region up to 50–60% strain. Complex modulus increases with GCF content but in such a manner that the observed reinforcement is at best of hydrodynamic origin, without any specific chemical interaction occurring between the polymer matrix and the fibers. The addition of maleated polypropylene improves the wetting of fibers by the molten polymer but the effect is so small that specific chemical reactions could hardly be considered as occurring. Flexural modulus data confirm the reinforcing effects of the fiber and an improvement is noted when some maleated polypropylene is used, with an optimum level of around 1% (or the PP content). SEM microphotographs clearly show that maleated polypropylene imparts a better wetting of GC fibers by PP, but chemical interactions are unlikely to occur between the polymer and GCF. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1922–1936, 2006     

Understanding the viscoelastic properties of extruded polypropylene wood plastic composites

The main goal of this study was to analyze the effect of process additives, that is, maleated polypropylene (MAPP), and a nucleating agent on the viscoelastic properties of different types of extruded polypropylene (PP) wood plastic composites manufactured from either a PP homopolymer, a high crystallinity PP, or a PP impact copolymer using dynamic mechanical thermal analysis. The wood plastic composites were manufactured using 60% pine wood flour and 40% PP on a Davis‐Standard Woodtruder?. Dynamic mechanical thermal properties, polymer damping peaks (tan δ), storage modulus (E′), and loss modulus (E″) were measured using a dynamic mechanical thermal analyzer. To analyze the effect of the frequency on the dynamic mechanical properties of the various composites, DMA tests were performed over a temperature range of ?20 to 100°C, at four different frequencies (1, 5, 10, and 25 Hz) and at a heating rate of 5°C/min. From these results, the activation energy of the various composites was measured using an Arrhenius relationship to investigate the effect of MAPP and the nucleating agent on the measurement of the interphase between the wood and plastic of the extruded PP wood plastic composites. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 89: 1638–1644, 2003     

Effect of impregnation time on performance of long glass fiber‐reinforced polypropylene composites

Long glass fiber (LGF)‐reinforced polypropylene (PP) composites were prepared using self‐designed impregnation device. Effects of impregnation time on mechanical properties, crystallization, dynamic mechanical properties, and morphology of PP/LGF composites were investigated. The experiment results demonstrate that the excellent tensile strength, Notched Izod impact strength was 152.9 MPa, 31.2 KJ/m², respectively, and the stiffness of PP/LGF composites was higher, when the impregnation time was 7.03 s. The excellent interfacial adhesion between PP and glass fiber indicates that PP/LGF composites possess the outstanding mechanical properties. The impregnation time scarcely influenced thermal properties of PP/LGF composites. J. VINYL ADDIT. TECHNOL., 24:174–178, 2018. © 2016 Society of Plastics Engineers     

Effect of long-chain branching molar fraction on scratch behavior of polypropylene

Polymers containing a certain amount of long-chain-branching (LCB) structure are expected to possess improved mechanical properties over those of the linear structure counterpart. However, fundamental knowledge on the structure–property relationship in LCB containing polypropylene (PP) is still illusive. In the present study, a set of model PP systems containing an increasing molar fraction of LCB (5–19 mol%) were prepared by reactive extrusion to determine how LCB content may influence the scratch behavior of PP. It is shown that with only 5 mol% of LCB content in PP can improve resistance against scratch-induced fish-scale formation by over 25%. The improvement of scratch resistance is attributed to the increases in entanglement density in LCB-containing PPs, which is evidenced by their creep-recovery behavior. The present study demonstrates that the incorporation of LCB in PP leads to higher viscoelastic recovery and increased tensile strength, which account for the observed improvement in scratch performance. The usefulness of LCB in polymers for improving scratch performance is discussed.     

Use of construction and demolition wastes as mineral fillers in hybrid wood–polymer composites

The recycling of construction materials has been the subject of much research in past years. In this study, the use of construction and demolition wastes (CDWs) as mineral fillers in hybrid wood–polymer composites was studied. Two types of waste materials were used as fillers in the composites: (1) a mixture consisting of waste mineral wool (MW) and plasterboard (PB) and (2) mixed CDWs. The performance of the composites was evaluated from their mechanical properties and water‐absorption behavior. We found in the study that the addition of mineral fillers decreased the flexural strength and modulus values of the wood–polypropylene (PP) composites. On the other hand, the exchange of part of the wood with a mineral filler resulted in an increase in the impact strength of the composite. The composite manufactured with the combination of MW and PB had the lowest water absorption. The decrease in wood loading resulted in improved dimensional stability in the hybrid wood–mineral filler–PP composites. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43412.     

Unidirectional hemp and flax EP‐ and PP‐composites: Influence of defined fiber treatments

In some technical areas, mainly in the automotive industry, glass fiber reinforced polymers are intended to be replaced by natural fiber reinforced polymer systems. Therefore, higher requirements will be imposed to the physical fiber properties, fiber‐matrix adhesion, and the quality assurance. To improve the properties of epoxy resins (EP) and polypropylene (PP) composites, flax and hemp fibers were modified by mercerization and MAH‐PP coupling agent was used for preparing the PP composites. The effects of different mercerization parameters such as concentration of alkali (NaOH), temperature, and duration time along with tensile stress applied to the fibers on the structure and properties of hemp fibers were studied and judged via the cellulose I–II lattice conversion. It was observed that the mechanical properties of the fibers can be controlled in a broad range by using appropriate mercerization parameters. Unidirectional EP composites were manufactured by the filament winding technique; at the PP matrix material, a combination with a film‐stacking technique was used. The influence of mercerization parameters on the properties of EP composites was studied with hemp yarn as an example. Different macromechanical effects are shown at hemp‐ and flax‐PP model composites with mercerized, MAH‐PP‐treated, or MAH‐PP‐treated mercerized yarns. The composites' properties were verified by tensile and flexural tests. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2150–2156, 2004     

Mechanical properties of composites from sawdust and recycled plastics

Mechanical properties of wood plastic composites (WPCs) manufactured from sawdust and virgin and/or recycled plastics, namely high density polyethylene (HDPE) and polypropylene (PP), were studied. Sawdust was prepared from beech industrial sawdust by screening to the desired particle size and was mixed with different virgin or recycled plastics at 50% by weight fiber loading. The mixed materials were then compression molded into panels. Flexural and tensile properties and impact strength of the manufactured WPCs were determined according to the relevant standard specifications. Although composites containing PP (virgin and recycled) exhibited higher stiffness and strength than those made from HDPE (virgin and recycled), they had lower unnotched impact strengths. Mechanical properties of specimens containing recycled plastics (HDPE and PP) were statistically similar and comparable to those of composites made from virgin plastics. This was considered as a possibility to expand the use of recycled plastics in the manufacture of WPCs. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 3641–3645, 2006