耐油聚酯型聚氨酯弹性体

本专利介绍的这种胶料包括50％～99％的嵌段共聚物(含有异丁烯聚合物嵌段和芳族乙烯基聚合物嵌段)和1％～50％的聚丙烯醚。此胶料包括100份异丁烯．苯乙烯嵌段共聚物和12份聚丙烯醚树脂(Noryl EFN 4230)。对这种配方的胶料进行捏和加工，即可制得此胶料，     

某牌号氟橡胶在发动机上的适应性研究

阐述了某牌号氟橡胶在发动机上的适应性考核过程.主要完成了使用条件及技术指标的分析、材料性能考核、不同批次生胶性能的影响研究、不同批次混炼胶稳定性研究、胶料耐国外润滑油及国产润滑油的性能研究,并完成了典型零件性能模拟试验.结果证明某牌号氟橡胶性能满足发动机零件制造要求.     

BR在内胎胶料中的应用

在内胎胶料配方中并用ＢＲ,可使硫化胶的扯断伸长率大幅度提高,撕裂强度也有明显改善,而对胶料的其它物理性能与工艺性能无显著影响。并用ＢＲ还可适当降低胶料成本。     

高强度、低压缩永久变形丁腈胶料研究

主要论述了提高丁腈橡胶强度和在高温下降低丁腈橡胶压缩永久变形的途径。研制出一种新型丁腈橡胶胶料，扩大了丁腈橡胶的应用范围。     

高强度,低压缩永久变形丁腈胶料研究

主要论述了提高丁腈橡胶强度和在高温下降低丁腈压缩永久变形的途径。研制出一种新型丁腈橡胶胶料，扩大了丁腈橡胶的应用范围。     

Mg(OH)2/PP和APP/PP阻燃复合材料的性能对比

比较了Mg(OH)2和APP阻燃聚丙烯复合材料的阻燃性能和力学性能。结果表明:APP的阻燃效果明显好于Mg(OH)2,锥形量热仪测试结果表明在阻燃性能上填充150份Mg(OH)2并不优于填充70份APP的聚丙烯阻燃材料;而APP的用量对材料力学性能的影响较大。     

高性能氢化丁腈橡胶密封胶料的制备及性能

研究了硫化剂过氧化二异丙苯(DCP)和增塑剂聚己二酸乙二醇酯(QS-1)用量对氢化丁腈橡胶(HNBR)硫化特性、力学性能、耐老化性能及动态力学性能的影响,并对其进行了差示扫描量热分析。结果表明,QS-1对胶料的焦烧时间、正硫化时间及硫化速率基本没有影响。DCP用量相同时,随着QS-1用量的增加,硫化胶的邵尔A硬度和200%定伸应力降低,扯断伸长率和压缩永久变形增大,但对拉伸强度影响不大;DCP用量对胶料扯断伸长率和压缩永久变形的影响远高于QS-1;高交联密度的胶料具有较好的耐热、耐油老化性能;QS-1对HNBR硫化胶的玻璃化转变温度以及耐热、耐油老化性能影响不大,但可降低胶料的Payne效应,进而改善炭黑在HNBR中的分散性。DCP用量在3.5份左右、QS-1用量在3～5份时可获得性能优异的密封胶料。     

橡胶工业用新材料——无定形聚丙烯

一、无定形聚丙烯简介 APP(Amorphous Propylene)是无定形聚丙烯的简称,即聚丙烯树脂台成中提去等规聚合物后的留余部分,过去作为废料而被弃置,也曾作为燃料来使用。随着聚丙烯产量逐年增长,APP的量也日益增多,合理使用这一资源已成为众所关注的问题。据国外资料介绍,APP可以作为橡胶的代用物,此外还兼具加工助剂的作用。其赋予橡胶加工的好处,跟低分子量聚乙烯类似,故归     

动态硫化制备聚烯烃弹性体/三元乙丙橡胶/聚丙烯热塑性硫化胶的性能

讨论了三元乙丙橡胶、硫化剂(TX-29)及聚丙烯用量对聚烯烃弹性体/三元乙丙橡胶/聚丙烯热塑性硫化胶硫化特性和力学性能的影响。结果表明,随着三元乙丙橡胶生胶用量的增加,热塑性硫化胶的交联程度逐渐降低,胶料的拉伸强度、撕裂强度、定伸应力、硬度和高温压缩永久变形都呈减小趋势,而扯断伸长率和扯断永久变形变大。随着硫化剂用量的增加,胶料的拉伸强度、撕裂强度和定伸应力先增大后减小,高温压缩永久变形和扯断伸长率逐渐减小。随着聚丙烯用量的增加,胶料的流动性和力学性能改善,高温压缩永久变形呈现先增大后减小的趋势。     

优化胎面配方设计提高矿用轮胎使用寿命

试验研究在全天然橡胶胎面配方中使用白炭黑和偶联剂,结果表明有助于提高抗撕裂性能。与完全使用炭黑胶料相比,拉伸强度相差不大,拉断伸长率、撕裂性能及回弹性增大,有利于提高轮胎在恶劣条件下的使用。     

Effect of cryo-ground rubber on melt flow and mechanical properties of polypropylene

The influence of cryo-ground rubber (CGR) on melt flow and mechanical properties of polypropylene has been investigated. Cryo-ground rubber was incorporated in the polypropylene matrix (a) in powder form and (b) as masterbatch with natural rubber. Natural rubber was found essential as a dispersing agent. The loading of cryo-ground rubber has no significant effect on viscosity at high shear rates (>61 s^?1) but at lower shear rates (>61 s^?1), viscosity functions change shape with increasing cryo-ground rubber content. The dynamic mechanical properties revealed that polypropylene is thermodynamically incompatible with natural rubber and cryo-ground rubber. Cryo-ground rubber in the powder form shows poor adhesion to polypropylene matrix and, therefore, decreases the impact strength at higher loading. Addition of masterbatch of cryo-ground rubber and natural rubber improves the impact strength of polypropylene.     

Polypropylene/natural rubber thermoplastic elastomer: Effect of phenolic resin as a vulcanizing agent on mechanical properties and morphology

The aim of this study is to characterize thermoplastic elastomers (TPEs) from polypropylene and natural rubber with and without phenolic resin as a vulcanizing agent. The blends containing 40–60 wt % of polypropylene were mixed in an internal mixer and pressed with a compression molding machine. TPEs without rubber vulcanization, named as unvulcanized thermoplastic natural rubber (uTPNR) were compared to TPEs containing dynamic vulcanized rubber, referred as vulcanized thermoplastic natural rubber (vTPNR). The uTPNRs illustrated cocontinuous phase morphology, whereas the vTPNRs displayed dispersed phase of vulcanized natural rubber. Tensile properties, tear strength, thermal ageing resistance, ozone resistance, tension set, hardness and swelling test in toluene, IRM 903 oil and engine oil were carried out according to ASTM. It was found that tensile and tear strength, hardness and tension set of the uTPNRs increased with increasing polypropylene content. Dynamic vulcanization improved tensile strength, elongation at break, tension set and degree of swelling of the TPEs, whereas hardness and tear strength did not show significant change after dynamic vulcanization. The vTPNRs exhibited higher ozone resistance and swelling resistance than the uTPNRs. Reprocessability of the vTPNRs was investigated and showed that tensile strength decreased at 20 and 30% and elongation at break decreased at 13 and 27% for the first and the third reprocessing respectively. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Tensile and Impact Properties of Thermoplastic Natural Rubber Reinforced Short Glass Fiber and Empty Fruit Bunch Hybrid Composites

Thermoplastic natural rubber (TPNR) hybrid composite with short glass fiber (GF) and empty fruit bunch (EFB) fiber were prepared via the melt blending method using an internal mixer type Thermo Haake 600p. The TPNR were prepared from natural rubber (NR), liquid natural rubber (LNR) and polypropylene (PP) thermoplastic, with a ratio of 20:10:70. The hybrid composites were prepared at various ratios of GF/EFB with 20% volume fraction. Premixture was performed before the material was discharged into the machine. The study also focused on the effect of fiber (glass and EFB) treatment using silane and maleic anhydride grafted polypropylene (MAgPP) as a coupling agent. In general, composite that contains 10% EFB/10% glass fiber gave an optimum tensile and impact strength for treated and untreated hybrid composites. Tensile properties increase with addition of a coupling agent because of the existence of adherence as shown in the scanning electron microscopy (SEM) micrograph. Further addition of EFB exceeding 10% reduced the Young's modulus and impact strength. However, the hardness increases with the addition of EFB fiber for the untreated composite and decreases for the treated composite.     

无规聚丙烯在改性沥青的应用

综述了无规聚丙烯在改性沥青中的应用，指出应加快直接合成低等规聚丙烯（LIPP）工业化进程，开发生产LIPP系列产品替代无规聚丙烯，无规聚烯烃，无规α-烯烃聚合物，同时，应从市场需求出发，尽快开展LIPP改性沥青的应用试验和市场开发。     

Kinetics of autoxidation of atactic polypropylene by infrared spectroscopy

The autoxidation of a film of atactic polypropylene was studied by means of infrared spectroscopy. Reaction temperatures varied from 110°C to 135°C and oxygen concentrations, from 5% to 100% by volume. A general reaction scheme previously reported for the autoxidation of polyolefins was utilized for atactic polypropylene. Various results obtained for this polymer were compared with those previously reported for isotactic polypropylene.     

阻燃抗冲聚丙烯的制备及性能研究

通过熔融共混工艺,制备了聚丙烯与橡胶、阻燃填料、顺酐化聚丙烯的共混物,研究了各组分对共混物力学性能及阻燃性能的影响。结果表明,橡胶使共混物的拉伸强度下降,冲击强度增加;顺酐化聚丙烯使共混物的拉伸强度和冲击强度明显提高;阻烯填料的加入使聚丙烯＝／丁苯橡胶（ＰＰ／ＳＢＲ）共混物的拉伸强度和冲击强度都降低,Ｍｇ（ＯＨ）２经硅烷偶联剂处理后,使ＰＰ／ＳＢＲ共混物的拉伸强度和冲击强度明显提高。     

硫化胶粉／均聚聚丙烯共混材料的研究

研究了偶联剂、橡胶再生剂S及其用量对共混体系性能的影响。结果表明：只添加偶联剂可以改善共混体系冲击强度和流动性能，但拉伸强度大幅度下降；配合添加橡胶再生剂S可使硫化胶粉脱硫“细化”，进一步提高了共混体系冲击强度，且拉伸强度也有所改善。     

The role of a novel p‐phenylen‐bis‐maleamic acid grafted atactic polypropylene interfacial modifier in polypropylene/mica composites as evidenced by tensile properties

Present work is devoted to the study of the tensile behavior of polypropylene (PP)/mica composites with improved interfacial interactions from the matrix side caused by the presence of a p‐phenylen‐bis‐maleamic acid grafted atactic polypropylene (aPP‐pPBM) as an interfacial agent. Hence, aPP‐pPBM was previously obtained, in our laboratories, by reactive processing in the melt of a by‐product (atactic PP) from industrial polymerization reactors. Present article is two‐fold, on one hand it has been planned to evidence the so called interfacial effects caused by this novel interfacial agent (aPP‐pPBM) yielding better final properties of the heterogeneous system as a whole as revealed by tensile mechanical properties, and on the other to obtain models to forecast the overall behavior of the system. For such purpose, a Box‐Wilson experimental design considering the amount of mica particles and of interfacial agent as independent variables was used to obtain polynomials to forecast the behavior of the PP/Mica system in the experimental space scanned. The existence of a critical amount of aPP‐pPBM to optimize mechanical properties appears to emerge. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

丁腈橡胶/橡塑材料并用研究进展

综述了近年来国内外丁腈橡胶与天然橡胶、丁苯橡胶、卤化丁基橡胶、三元乙丙橡胶、聚丙烯、聚氯乙烯、乙烯-乙酸乙烯共聚物、聚酰胺及其他橡塑材料并用改性的研究进展.     

Role of reaction time in batch process modification of atactic polypropylene by maleic anhydride in melt

Following our studies on chemical modification proceses of polypropylenes by maleic anhydride, some new experimental works are shown here that check the possibilities of processing atactic polypropylene in the melt by a batch process. A modified polymer that is supposed to be useful as an interfacial agent if used in heterogeneous systems based on polypropylene is also clearly obtained. The favorable effect of the nonstereoregularity of the polymer can be noted. This polymer has a higher level of modification than the stereoregular polymer (isotactic polypropylene), despite the lower processing temperature used that causes a decrease in the initiator activity. Otherwise, this article deals with the role played by the reaction time during the process. A mechanism of chemisorption and some considerations about the fractal nature of the reaction kinetics are proposed to explain the results obtained. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 65: 1333–1347, 1997