改性胶粉在废旧苯乙烯类混杂塑料中的应用研究

研究了采用不同方法对精细胶粉(GRT)进行改性,并应用于废旧苯乙烯类混杂塑料(WPS)中,详细讨论了改性精细胶粉的用量对于复合材料体系拉伸强度、冲击强度等力学性能的影响。测试结果表明,对于不同改性方法制备的改性胶粉,均是在WPS中用量为5份时,所得复合材料的综合性能较好。其中,De link再生剂与SBR并用改性胶粉与WPS复合材料的拉伸强度为最高,为基体WPS的88 2%,较之未改性WPS/GRT提高了51 5%;羧基丁苯胶乳、引发剂BPO和偶联剂A 174并用改性胶粉/废旧苯乙烯类混杂塑料的冲击强度最高,比废塑料基体提高了43 3%,比未改性GRT/WPS复合材料提高了2 5倍。扫描电镜测试分析表明,胶粉改性可有效改善其与塑料基体间的界面粘合。     

废胶粉/聚丙烯接枝物共混材料的制备与性能

采用熔融接枝法分别制备了高强度和高熔体流动速率的聚丙烯接枝马来酸酐共聚物,以改善聚丙烯与胶粉间的界面相容性,提高废胶粉/聚丙烯接枝物共混材料的力学性能和流动性.力学性能测试结果表明,随着废胶粉用量的增加,废胶粉/聚丙烯接枝物共混材料的拉伸性能下降,扯断伸长率和缺口冲击强度均增大,熔体流动速率减小,流动性变差.由热重分析...     

废胶粉与POE改性二次回收聚丙烯的研究

采用废胶粉和乙烯/辛烯共聚物(POE)对二次回收聚丙烯(RPP)进行增韧改性,制成RPP/废胶粉和RPP/POE共混材料,研究了两种共混材料力学性能、热性能与流变性能等.结果表明,当废胶粉加入80份时,缺口冲击强度提高约67%.RPP/废胶粉改性体系有较好的耐热性、较高的硬度与耐磨性,属于非牛顿性假塑性流体,废胶粉可以部分替代POE作为某些制品的增韧剂.     

精细废轮胎胶粉增韧PVC复合材料应用研究

采用新方法生产的废轮胎胶粉(粒径120～180μm)作为增韧材料填充到聚氯乙烯(PVC)中，以提高PVC材料的抗冲击性能。结果表明，较细颗粒的胶粉填充有利于提高复合材料的冲击强度，细胶粉填充改性的PVC材料其冲击强度可达60kJ／m^2以上，为未填充胶粉的对比样的2倍．拉伸强度仍保持在对比样的65％以上。利用扫描电镜．对复合材料中橡胶颗粒的填充形貌进行分析，结果发现宏观数百微米以上尺寸的橡胶颗粒在PVC基体中进一步分散成微米级细颗粒，从而使复合材料表现出良好的抗冲击性能。     

SX—580塑料

SX—580玻璃纤维增强塑料是以聚乙烯醇缩丁醛和环氧树脂双改性的酚醛树脂为基体,经KH—550表面处理的高强定长玻璃纤维为增强材料的网状半定向热固性模压塑料。 该塑料具有较高的机械强度、较好的热     

废胶粉填充改性PP复合材料

采用熔融挤出共混的方法,选用三种废胶粉填充聚丙烯(PP),制备了PP/废胶粉复合材料,研究了废胶粉质量分数对复合材料力学性能的影响.结果表明:废旧三元乙丙橡胶粉可明显提高复合材料冲击强度和拉伸断裂应变,当其质量分数为60%时,简支梁缺口冲击强度可提高33%,拉伸断裂应变增大了26%,有显著的增韧效果:废旧杂胶粉的加入使...     

废胶粉利用研究进展

综述了废胶粉利用研究的进展，包括废胶粉的再生利用、直接利用和表面改性利用等方面的新动向。重点叙述了胶粉表面改性利用，即可将经过表面处理的废胶粉用于增韧塑料、制做热塑性弹性体、制做软泡沫塑料和ＰＵ／胶粉等复合材料。     

耐高寒玻纤增强尼龙的制备及性能研究

以尼龙66(PA66)为基体树脂、玻璃纤维为增强体,选用马来酸酐接枝聚烯烃弹性体(POE-g-MAH)为增韧剂并添加适宜复合添加剂,通过熔融共混的方法制备了一系列高强增韧尼龙材料。研究了增韧剂添加量及复合添加剂对材料力学性能的影响,并对其在常温、低温及高寒条件下的性能进行研究,结合扫描电子显微镜(SEM)对复合材料的微观形貌进行表征。结果表明,随着增韧剂添加量的增加,材料的拉伸强度、弯曲强度和无缺口冲击强度逐渐降低,缺口冲击强度逐渐增加,当增韧剂添加量为6份时材料的综合力学性能最优;在低温处理时材料的性能变化主要发生在开始处理的2 h内,且随着低温处理时间的延长以及温度的降低,材料的缺口冲击强度均逐渐降低、无缺口冲击强度均逐渐增加,且适宜复合添加剂的加入会改善材料的热稳定性以及玻璃纤维与基体树脂之间的界面结合性。综上所述:增韧剂添加量为6份,选用适宜复合添加剂制备材料中的玻纤与基体树脂结合性更好,材料力学性能及耐高寒性能最优。     

废胶粉填充改性RHDPE增容研究

研究了废胶粉的活化处理、不同种类相容剂对回收高密度聚乙烯/废胶粉(RHDPE/WRP)共混体系的增容效果.结果表明,WRP活化处理对提高WRP界面活性有效果.不同相容剂对提升共混体系性能的影响不同,其中添加10份马来酸酐接枝聚乙烯(PE-g-MAH)相容剂对提升RHDPE/活化WRP体系整体性能最有效,可使RHDPE/WRP共混材料的拉伸强度从简单共混物的18.8 MPa提高到22.5 MPa,缺口冲击强度从37.5 kJ/m2提高到60.9 kJ/m2;热变形温度从55.8℃提高到63.6℃.     

增韧剂对废聚苯乙烯的力学性能、HDT、VST及尺寸稳定性的影响

研究了苯乙烯-丁二烯-苯乙烯嵌段共聚物(SBS)和高胶粉对废电视机后壳料聚苯乙烯(F-PS)的力学性能、尺寸稳定性、热变形温度(HDT)和维卡软化点温度(VST)的影响,结果表明:SBS和高胶粉在F-PS中有协同增韧作用,在F-PS中复配加入w=6%的SBS和w=2%的高胶粉时,材料的缺口冲击强度从4.5 kJ/m^(2)提高到7.6 kJ/m^(2),增加量为3.1 kJ/m^(2),比单独添加w=8%的SBS的缺口冲击强度(6.9 kJ/m^(2))高0.7 kJ/m^(2),伸长率从28.6%提高到36.7%,增加量为8.1个百分点;高胶粉和SBS都可提高F-PS的尺寸稳定性,但会使F-PS的HDT和VST降低。     

Vulcanization characteristics and mechanical properties of natural rubber–scrap rubber compositions filled with leather particles

Scrap rubber recycling combined with waste leather particles in natural rubber compounds has been studied. The effect of leather and scrap rubber loading on vulcanization characteristics of natural rubber compounds has been evaluated. The presence of leather was found to reduce the scorch time and increase the maximum and minimum torque. While reversion was not observed in the absence of leather at 150 °C, it was more prominent when leather was incorporated. Mechanical properties such as tensile strength, elongation at break, tear strength, modulus and hardness were found to increase on increasing the scrap rubber loading in the absence of leather. Compounds containing leather exhibited higher tensile strength, modulus, hardness and tear strength values but the modulus and hardness values were found to decrease as the scrap rubber loading increased. All the vulcanizates exhibited only limited swelling in different media as the swelling of one phase of the composite was found to be restricted by the other phase. Copyright © 2004 Society of Chemical Industry     

废旧轮胎橡胶的常温粉碎及性能研究

采用盘式磨设备对废旧轮胎胎面胶颗粒进行常温粉碎,研究胶粉性能及其对丁苯橡胶(SBR)硫化胶物理性能的影响,并与胎面胶颗粒进行对比。结果表明:常温粉碎胶粉的粒径比胎面胶颗粒降低了一个数量级,形状更加不规则且表面粗糙;动盘和定盘相对转速对常温粉碎胶粉粒径及其分布影响不大,但动盘和定盘间隙影响较大;常温粉碎胶粉的热稳定性比胎面胶颗粒低,且交联密度减小一半以上;与胎面胶颗粒相比,添加常温粉碎胶粉的SBR硫化胶的拉断伸长率有很大提高,但邵尔A型硬度、100%和300%定伸应力以及拉伸强度有所减小。     

The Effect of Rice Husk Powder on Standard Malaysian Natural Rubber Grade L (SMR L) and Epoxidized Natural Rubber (ENR 50) Composites

The effects of rice husk powder (RHP) loading and two types of natural rubber matrix (SMR L and ENR 50) on curing characteristics and mechanical properties were studied. The scorch time and cure time decreased with increasing RHP loading whereas maximum torque showed an increasing trend. SMR L composites possessed longer scorch time and cure time than ENR 50 composites. Incorporation of RHP into both rubbers improved tensile modulus significantly but decreased tensile strength and elongation at break. SMR L composites exhibited the lower tensile modulus and higher tensile strength and elongation at break than ENR 50 composites.     

Curing characteristics and mechanical properties of rattan‐powder‐filled natural rubber composites as a function of filler loading and silane coupling agent

Curing characteristics, tensile properties, morphological studies of tensile fractured surfaces using scanning electron microscopy (SEM), and the extent of rubber filler interactions of rattan‐powder‐filled natural rubber (NR) composites were investigated as a function of filler loading and silane coupling agent (CA). NR composites were prepared by the incorporation of rattan powder at filler loading range of 0–30 phr into a NR matrix with a laboratory size two roll mill. The results indicate that in the presence of silane CA, scorch time (t_s2), and cure time (t₉₀) of rattan‐powder‐filled NR composites were shorten, while, maximum torque (M_H) increased compared with NR composites without silane CA. Tensile strength and tensile modulus of composites were enhanced whereas elongation at break reduced in the presence of silane CA mainly due to increase in rubber‐filler interaction. It is proven by SEM studies that the bonding between the filler and rubber matrix has improved. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

Aluminum powder filled nitrile rubber composites

Effect of aluminum powder on the properties of nitrile rubber (NBR) composites and the role of bonding agent viz. hexamethylene tetramine‐resorcinol has been investigated. Shore A hardness of the aluminum powder filled composites is lower than that of high abrasion furnace (HAF) and acetylene black (ACB) filled nitrile rubber composites and can be increased by the addition of bonding agent. Equilibrium swelling decreased considerably by the use of hexamethylene tetramine‐resorcinol, suggesting an improved nitrile rubber–aluminum powder adhesion. A marked increase in thermal conductivity is obtained with the incorporation of aluminum powder. Increased thermal conductivity reduced the additional time needed for the vulcanization of thick rubber articles and imparted uniform curing throughout the material. In nitrile rubber, the modulus and tensile strength followed the order HAF > ACB > aluminum powder. Combination of HAF and aluminum powder in NBR gave composites with good thermal conductivity and mechanical properties. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 91: 3156–3161, 2004     

废胶粉的改性及其在砂浆中的应用

通过表面接枝改性制备了改性胶粉SRP。利用高分辨裂解气相色谱－质谱联用仪（PyGC-MS）和FTIR对SRP的结构进行了分析,测试结果表明,SRP已接枝上磺酸基团。对改性胶粉/砂浆的工作性能和力学性能进行了研究。通过流动度及流动度损失的测定,找出了胶粉（RP）和改性剂的最佳用量比;同时结果表明,改性胶粉SRP可以有效改善砂浆的流动性,并减小流动度损失;在力学性能方面,RP/砂浆复合材料的抗压和抗折强度都大幅下降,而对SRP/砂浆复合材料在保证其抗压强度的同时,实现了抗折强度的提高,材料表现出一定的韧性。胶粉改性方法简单,有利于工业生产。     

Structure and properties of strain‐induced crystallization rubber–clay nanocomposites by co‐coagulating the rubber latex and clay aqueous suspension

Natural rubber (NR)–clay (clay is montmorillonite) and chloroprene rubber (CR)–clay nanocomposites were prepared by co‐coagulating the rubber latex and clay aqueous suspension. Transmission electron microscopy showed that the layers of clay were dispersed in the NR matrix at a nano level, and the aspect ratio (width/thickness) of the platelet inclusions was reduced and clay layers aligned more orderly during the compounding operation on an open mill. However, X‐ray diffraction indicated that there were some nonexfoliated clay layers in the NR matrix. Stress–strain curves showed that the moduli of NR were significantly improved with the increase of the amount of clay. At the same time, the clay layers inhibited the crystallization of NR on stretch, especially clay content of more than 10 phr. Compared with the carbon‐black‐filled NR composites, NR–clay nanocomposites exhibited high hardness, high modulus, high tear strength, and excellent antiaging and gas barrier properties. Similar to NR–clay nanocomposites, CR–clay nanocomposites also exhibited high hardness, high modulus, and high tear strength. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 96: 318–323, 2005     

不同配方对改性废胶粉性能的影响

研究了不同配方改性胶粉的硫化特性和物理机械性能;考察了活化剂420的用量、三乙醇胺的用量、软化剂丙烯酸的用量对改性胶粉的性能影响。结果表明：将几种活化剂、软化剂并用改性胶粉,所得胶样的性能较好。     

Fracture behavior of NR and SBR vulcanizates filled with ground rubber having uniform particle size

The use of recycled rubber including ground scrap vulcanizates in rubber compounds was studied. When ground rubber was incorporated into rubber compounds, the physical properties, especially the tensile strength, were deteriorated compared to the virgin rubber compound. Also, incorporating ground rubber caused a change of the cure behavior via migration of sulfur or an accelerator between the virgin rubber matrix and the ground rubber vulcanizate. In this study, the fracture behavior and abrasion property of carbon black‐filled SBR and NR compounds containing ground rubber vulcanizate were investigated. Also, the effect of the particle size or loading volume of ground rubber powder on those properties was studied. Four different sizes, 420–600, 177–250, 125–150, and 75–88 μm, of ambient ground rubber powder recycled from waste tire were selected and used in the compounding. The loading amounts of ground rubber powder were 10, 30, and 50 phr. The flex crack growth of SBR‐ and NR‐based compounds was altered by the addition of ground rubber particles. More delayed crack growth was observed with an increasing loading volume and decreasing particle size of the ground rubber powders, and this behavior was more prominent in SBR than in NR compounds. Tangent delta, a direct measure of internal energy dissipation, increased with an increasing loading volume of the ground rubber particles. The abrasion rate of ground rubber‐filled compounds was more dependent on the size of the abrasion pattern than on the loading level or particle size of the ground rubber powders. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 85: 2491–2500, 2002