NBR／PVC共沉胶加工性能探讨

NBR/PVC共沉胶的主要优点是PVC的耐臭氧性和丁腈橡胶的耐油性和可交联性。本文主要从促进剂、补强剂、软化剂几个方面对NBR/PVC共沉胶的加工性能进行了探讨和研究,结果表明,考虑到对本NBR/PVC共沉胶加工综合性能贡献最大(包括NBR/PVC共沉胶的硫化体系、增塑体系、补强填充体系),我们应对促进剂采用CZ、碳黑采用HAF、浅色填料采用白碳黑、增塑剂采用DOP;同时NBR/PVC共沉胶加工性能最佳配方为NBR/PVC100,ZnO5,SA1,S1.5,DOP15,TMTD/CZ2.5/0.5,HAF30。     

NBR／PVC共混胶在燃油胶管中的应用

探讨了德国拜耳公司乳液共沉法生产的NBR/PVC共混胶料填充各种常用配合剂后的物理性能的变化,介绍了NBR/PVC共混胶在耐燃油胶管中的应用配方和制造工艺。     

NBR/PVC共混胶的结构与性能

采用机械共混法和乳液共沉法制备了NBR/PVC共混胶,通过差示扫描量热仪(DSC)和场发射扫描电子显微镜(FE-SEM)对共混胶的微观形貌、结构进行了表征,考察了共混方式和共混胶配比对其力学性能的影响,并比较了共混胶、CPE、P-83对硬质/软质PVC的改性效果。结果表明:①与机械共混胶相比,乳液共沉胶混合得更均匀,分散性更好,其分子级混合程度更好;②乳液共沉胶试样的力学性能在总体上优于机械共混胶;③对于硬质PVC,CPE的改性效果优于其他改性剂;④对于软质PVC,乳液共沉胶的改性效果最好,特别是对撕裂强度的提高非常明显。     

环保型增塑剂对NBR/PVC共混胶性能的影响

研究4种环保型增塑剂TOTM（偏苯三酸三辛酯）,BXA-N{己二酸二[2-（2-丁氧基乙氧基）乙酯]},A-8000（己二酸聚酯）和TP-759（聚醚和聚酯的混合物）对丁腈橡胶（NBR）/聚氯乙烯（PVC）共混胶性能的影响。结果表明：增塑剂的相对分子质量和分子结构是影响NBR/PVC共混胶性能的主要因素;添加增塑剂TOTM和A-8000的硫化胶物理性能较好;添加增塑剂BXA-N和TP-759的硫化胶更耐IRM903#油和燃油C的渗入,在燃油C中浸泡后物理性能变化更小;添加增塑剂A-8000的硫化胶的耐压缩永久变形性能和耐热空气老化性能较好。在4种环保型增塑剂中,增塑剂A-8000更适用于NBR/PVC共混胶。     

增塑PVC/NBR共混胶的辐照改性

以三羟甲基丙烷三丙烯酸酯（TMPTA）单体为交联敏化剂，采用电子束对聚氯乙烯（PVC）与丁腈橡胶（NBR）的共混胶进行了辐照改性。研究结果表明，对增塑PVC/NBR共混胶进行辐照改性，可以大大提高共混胶的力学性能及耐热性能。     

聚氯乙烯(PVC)改性剂──乳液丁腈/聚氯乙烯(NBR/PVC)共沉粉末丁腈胶

丁腈橡胶是PVC的优良改性剂，可提高PVC制品的抗冲性能、耐寒性，改善成型加工性能，它与PVC树脂有十分良好的相容性，在树脂中不挥发、不迁移，起长期内增塑作用。可是普通丁腈橡胶均为25kg重的整块胶，这样大块的胶很难与粉状PVC树脂混合，从而使它的应用受到了很大的限制。北京化工学院采用了腈乳胶与PVC粉共沉法制得了粉状NBR／PVC共沉粉末丁腈。可广泛应用于各种PVC硬制品和软制品的改性，如PVC密封胶条（包括汽车密封条和门窗密封条）、优质PVC鞋料、电缆、纺织胶辊、塑料冷弯管及硬质PVC塑料门窗等各种制品，可代替进…     

EPDM/NBR共混胶硫化体系的研究

研究了过氧化物DCP、DCP/S并用硫化体系及共交联剂ZDMA的加入对三元乙丙胶/丁腈胶(EPDM/NBR)共混胶性能的影响。研究表明:在过氧化物硫化体系中,随DCP用量的增加,共混胶综合性能先提高后降低,DCP用量为3份时性能达到最佳;DCP/S并用硫化体系中,随硫磺和促进剂加入量的增加,共混胶硫化速度提高,但综合力学性能降低;共交联剂ZDMA由0份增加至15份,共混胶力学性能显著增加,老化性能没有改善。     

影响NBR/PVC共混硫化胶性能因素的研究

系统研究了影响丁腈橡胶/聚氯乙烯(NBR/PVC)共混胶性能的主要因素,包括PVC塑化温度、增塑剂用量、橡塑比、PVC的聚合度、NBR的丙烯腈质量分数。研究结果表明,塑化温度在160℃、增塑剂用量为20份、橡塑比为60/40~70/30时,NBR/PVC共混硫化胶综合性能较好。随着PVC聚合度的提高,NBR/PVC共混硫化胶力学性能得到提高;NBR中丙烯腈含量的增大有利于NBR/PVC共混硫化胶性能的提高。     

纳米碳酸钙丁腈橡胶母炼胶的制备及性能评价

采用乳液法制备了丁腈橡胶（NBR）/纳米碳酸钙（NCC）共沉橡胶,并对其性能进行了评价。基本性能实验结果表明：与NBR相比,共沉胶焦烧时间略有降低,正硫化时间略有增加,最大扭矩明显提高,共沉胶具有优异的基本物理性能;工业配方配合显示：共沉胶具有优异的基本物理性能、耐热空气老化性能以及耐热油性能;共沉胶成本明显降低,具有良好的应用前景。     

NBR/PVC TPV与NBR/PVC共混胶的性能对比研究

以丁腈橡胶(NBR)和聚氯乙烯(PVC)树脂为基础材料,采用动态硫化和熔融共混的方法分别制备了NBR/PVC动态硫化热塑性弹性体(TPV)与NBR/PVC共混胶,并对TPV和共混胶的高温拉伸性、耐热空气老化性、耐油性以及动态力学性能进行了对比研究。研究结果表明,室温下,NBR/PVC TPV的拉伸强度高于共混胶的;温度高于50℃时,共混胶的拉伸强度则高于TPV的。在测试温度下,NBR/PVC TPV的断裂伸长率始终低于共混胶,两种材料在120℃时都失去使用价值。NBR/PVC TPV的耐热空气老化性能和耐3#标准油性能优于NBR/PVC共混胶的。NBR/PVC TPV初始弹性模量较高,共混胶的损耗因子峰值高于TPV的,两种材料损耗因子峰值温度基本相同。     

NBR／PVC／CO耐油胶管的研制

研究了丁腈橡胶／ 聚氯乙烯／ 氯醇橡胶三元共混胶制备胶管的胶料配方和混炼制造工艺,主要探讨ＮＢＲ／ ＰＶＣ／ ＣＯ 共混比、硫化体系、补强剂等因素对胶管用混炼胶性能的影响。实验结果表明：ＮＢＲ／ ＰＶＣ／ ＣＯ 共混胶经过合理的配合能够制得综合性能良好的胶料,并能改善ＮＢＲ／ ＰＶＣ老化硬化现象。     

三元共聚尼龙/聚氯乙烯/丁腈橡胶三元共混弹性体研究

选择三元共聚尼龙（PA），聚氯乙烯（PVC）和丁腈橡胶（NBR）为主体材料，采用高温机械共混，化学交联工艺制得了PA／PVC／NBR三元共混弹性体，探讨了PA／NBR，POM／NBR，PVC／NBR，HMWPVC／NBR三元共混体系性能，重点讨论了PA／PVC／NBR共混比，不同硫化体系，有机过氧物DCP用量等因素对PA／PVC／NBR三元共混弹性体性能的影响，实验结果表明：选择适宜配方制得力学性能和耐油耐溶剂性能较好的PA／PVC／NBR三元共混弹性体，扫描电镜的实验结果证实m(PA):m(PVC):m(NBR)=10:30:60和m(PA):m(PVC):m(NBR)=30:10:60两个体系的三元共混弹性体均具有较好的相容性，且前者的相容性更好。     

煤矿井下用PVG整芯阻燃输送带覆盖胶工艺研究

<正>整芯阻燃输送带是煤矿井下采煤的输送工具,与普通输送带相比,具有阻燃、强度高、使用寿命长等特点。覆盖胶是输送带的面层材料,完全包覆着带芯,起保护带芯、延长输送带使用寿命的作用,其主要技术指标为阻燃性能和抗静电性能。PVG整芯阻燃输送带覆盖胶的主体材料PVC/NBR,改善了PVC     

Mechanical Properties and Thermooxidative Aging of a Ternary Blend,Pvc/Enr/Nbr,Compared with the Binary Blends of Pvc

In the quest to improve the thermooxidative aging of the poly(vinyl chloride)/epoxidized natural rubber (PVC/ENR) blend, nitrile rubber (NBR) was incorporated into the blend to yield a ternary blend of PVC/ENR/NBR. A Brabender Plasticorder with a mixing attachment was used to perform the melt mixing at 150°C and 50 rpm followed by compression molding. The mechanical properties, dynamic mechanical properties, and thermooxidative aging behavior of the ternary blend were compared with those of the binary blends (i.e., PVC/ENR and PVC/NBR). It was found that the ternary blend exhibits mechanical properties which are superior to those of PVC/ENR. A single glass transition temperature (T _g) obtained from dynamic mechanical analysis coupled with synergism in the modulus and some other mechanical properties indicate that PVC, ENR, and NBR form a single phase (miscible system) in the ternary blend. Di-2-ethyl hexylphthalate (DOP) plasti-cizer improves the aging resistance of the blends generally, whereas the presence of CaCO₃ as a filler only imparts minor influences on the properties and aging resistance of the blends.     

Mechanical properties of PVC/SBR blends compatibilized by acrylonitrile-butadiene rubber and covulcanization

The mechanical properties of poly(vinyl chloride) (PVC)/styrene-butadiene rubber (SBR) blends compatibilized by acrylonitrile-butadiene rubber (NBR) were studied. A sulfur curing system was employed to crosslink the rubber of the blends. In the case of the blends without any curing agents, an increase in NBR content did not improve the tensile strength and elongation-at-break. However, a significant improvement in the mechanical properties was observed when NBR was added as a compatibilizer and the blend was vulcanized. In the PVC/NBR/SBR (50/10/40) blends, the tensile strength and elongation-at-break increased with an increase in sulfur concentration. This improvement was attributed to covulcanization between NBR and SBR. The fracture toughness of PVC/NBR/SBR (50/10/40) blends was characterized by the critical strain energy release rate, G_c. In the case of the PVC/NBR-29/SBR (50/10/40) blends, an increase in sulfur concentration resulted in a dramatic increase in G_c. However, the G_c value of PVC/NBR-40/SBR (50/10/40) blends decreased with an increase in sulfur concentration owing to the brittle behavior of one of the blend components—the PVC/NBR-40 (50/10) phase.     

聚氯乙烯/丁腈橡胶/顺丁橡胶浅色模压胶辊的研制

研究采用聚氯乙烯／丁腈橡胶／顺丁橡胶三元共混制备模压浅色胶辊的配方和工艺，主要探讨ＰＶＣ／ＮＢＲ／ＢＲ共混比，稳定剂，填充剂及硫化体系等因素对橡塑并用胶辊性能的影响。实验结果表明：选择ＰＶＣ／ＮＢＲ／ＢＲ＝３０／６０／１０，并配以过氧化物加少量硫黄的硫化体系及白炭黑等助剂，可制得综合性能较好的浅色橡塑胶辊。     

Study on compatibilization-crosslinking synergism in PVC/LDPE blends

Influences of nitrile rubber (NBR, acrylonitrile content 33.5 – 36.5 wt.-%) on the structure and mechanical properties of poly(vinyl chloride) (PVC)/low density polyethylene (LDPE) blends and its synergism with crosslinking agent have been studied. The addition of NBR to the blend is accompanied by a decrease in domain size and improvements in mechanical properties of the blend. When dicumyl peroxide (DCP) is added to the blend together with NBR, good synergism is caused and mechanical properties will improve dramatically. It is concluded that NBR can promote the phase dispersion of PVC and LDPE and their interfacial adhesion. Then, the probability of DCP existing at the interface will increase and more co-crosslinked products will form. Therefore, compatibilization and crosslinking are both exerted sufficiently.     

NR/PVC/NBR共混物的耐油性能研究

研究用NBR改善NR/PVC共混物的耐油性能 ,通过测试所设计的各配方共混物的拉伸强度、扯断伸长率、硬度、耐磨性和耐油性等性能 ,得出NBR改性NR/PVC共混体系的最佳配比关系。最佳配方为 :PVC　 30 ;NR　10 0 ;NBR　 2 5 ;硫黄　 3;促进剂TMTD　 0 8;促进剂D　 1 5 ;促进剂DM　 1 5 ;白炭黑　 40 ;轻质碳酸钙　 30 ;氧化锌　 5 ;硬脂酸　 1 5 ;防老剂D　 2。共混物的耐油性能可达到NBR制品的要求