橡胶改性酚醛树脂摩擦材料的研究

研究了用4种橡胶共混改性酚醛树脂的效果。通过对硼改性酚醛树脂(FB)、腰果壳油改性酚醛树脂(YM)及苯并噁嗪开环聚合酚醛树脂(BEN)进行热分析及摩擦性能试验，筛选出FB树脂为摩擦材料的基体树脂；对NBR、羧基丁腈橡胶、SBR及丁苯吡橡胶改性FB树脂摩擦材料进行冲击性能和摩擦性能试验，结果表明羧基丁腈橡胶改性FB树脂摩擦材料的综合性能最佳。     

羧基丁腈—酚醛型粘合剂性能及应用

羧基丁腈—酚醛型粘合剂是由羧基丁腈、热固性的酚醛树脂和丁吡胶乳配制成的双组份的粘合剂,适用于天然、丁苯并用胶与裸钢的粘合,粘合力可达:扯离力50～80公斤/厘米~2,剥离力10～15公斤/厘米。已有文献记载,在橡胶中引入羧基官能团是能改善粘附的。羧基丁腈—酚醛型粘合剂是利用羧基丁腈、热固性酚醛树脂和丁吡胶乳的协同作用完成的,羧基能与钢表     

耐高温硼改性酚醛胶粘剂的制备及性能研究

选用硼改性酚醛树脂为基体,固体羧基丁腈混炼胶为增韧剂,硼粉、硅粉、碳化硼(B4C)为填料,制备了酚醛胶粘剂。通过粘接强度测试和热重分析研究了丁腈混炼胶用量,硼粉、硅粉、B4C的粒径对硼酚醛胶粘剂性能的影响。结果表明:当固体羧基丁腈混炼胶的质量分数为12%时,其室温粘接强度达到最大值。硼粉,硅粉和碳化硼的最佳粒径分别为20,13,3.5μm,所制备的硼酚醛胶粘剂对不同材料都有较好的高温粘接性能,其使用温度可以达到800℃以上。     

改性环氧树脂耐热胶粘剂

介绍了一种改性丁腈－40橡胶改性多官能环氧树脂耐热胶粘剂，通过采用混合丙烯酸酯作为硫化剂硫化丁腈橡胶，克服了丁腈－40橡胶耐热性能差的缺点，使其耐热性能接近羧基丁腈橡胶，该胶具有较低的成本和良好的耐热性能，可在180℃使用，用于航空，航天工业。     

丁腈橡胶增韧环氧树脂研究进展

综述了近年来丁腈类橡胶增韧环氧树脂的研究进展,其中包括固体丁腈橡胶,液体丁腈橡胶(丁腈-40液体橡胶,无规端羧基液体丁腈橡胶(CRBN),端羧基液体丁腈橡胶(CTBN),改性端羟基丁腈橡胶(HTBN),改性端氨基液体丁腈橡胶(ATBN))以及改性液体丁腈橡胶与纳米SiO2共同增韧环氧树脂。     

用铂金板法测定橡胶胶乳的表面张力

分别考察了全自动和半自动表面张力仪在测定橡胶胶乳表面张力时铂金板润湿高度和取值方式对结果的影响,分析了影响橡胶胶乳表面张力测定的因素,建立了较完整的测定橡胶胶乳表面张力的铂金板法。结果表明,在进行羧基丁苯胶乳、羧基丁腈胶乳、氯丁胶乳和天然胶乳表面张力的测定时,两种类型仪器的数据具有可比性,而重复性均较用ISO 1409:2006铂金环法要好。     

液体丁腈橡胶（LNBR）系列产品

兰州石化公司石油化工研究院早已开发成功并独家生产液体丁腈橡胶（LNBR）产品，外观为浅黄色或褐色黏稠液体，系列产品有液体丁腈-26、液体丁腈40，羧基液体丁腈等，结合丙烯腈含量分别为23％～27％（质量）、30％～34％、30％～35％灰分和挥发分均≤1％，羧基含量为0．055～0．110Ephr。广泛用作环氧树脂、酚醛树脂的增韧剂，制备韧性好、强度高、耐油、耐热、耐老化的胶粘剂和密封胶，其中羧基液体丁腈橡胶的改性效果更好。     

基于两种丁腈橡胶复合填料的高性能离合器摩擦材料

本文提出了以丁腈乳胶改性水基酚醛树脂作粘合剂,分别以玻璃纤维和复合包芯纱纤维作为增强材料。采用两种新型丁腈复合填料作主要填料制备高性能离合器摩擦材料的试验方法。两种新型复合填料分别为含9％硫化丁腈橡胶和含20％未硫化丁腈橡胶。试验表明：当两种新型复合填料按1：1的比例加入,即丁腈橡胶含量在16％左右时,制备出的摩擦材料具有良好的摩擦磨损性能、适中的硬度、良好的冲击强度及较低的噪音。     

飞机油箱表面整体保护的密封涂料粘接性能研究

以氢化丁腈为基体橡胶,配合酚醛树脂、补强填料、增粘树脂、混合溶剂制备了一种高性能飞机整体油箱用表面保护密封涂料。研究了氢化丁腈、补强填料和增粘树脂的种类及配比对保护密封涂料性能的影响。结果表明,以端羧基氢化丁腈(Therban XT VP KA 8889)为主体橡胶、6份A200气相二氧化硅为补强填料、10份EPS25环氧封端聚硫为增粘树脂制备的保护密封涂料综合性能优异。     

摩擦材料中树脂基体的选用

概述了摩擦材料对树脂基体的性能要求，讨论了硼改性酚醛树脂，三聚氰胺-腰果壳油改性酚醛树脂和开环聚合酚醛树脂的改性方法，并对它们的热性能进行了比较分析，测试了以这三种改性酚醛树脂为基体的摩擦材料的摩擦性能，结果表明，三聚氰胺-腰果壳油改性酚醛树脂为适宜的摩擦材料用基本树脂。     

Synthesis and properties of nano carboxylic acrylonitrile butadiene rubber latex toughened phenolic resin

Nano carboxylic acrylonitrile butadiene rubber latex‐toughened‐phenolic resins (XNBRL‐PF) were prepared by in situ polymerization in this work. The influence of nano XNBRL on the microstructure and physical properties of modified PF resin was investigated. Impact test testified that the impact strength of XNBRL‐PF was remarkably improved compared to pure PF and as the content of XNBRL increased to 10 wt %, the impact strength of the XNBRL‐PF kept increasing. Scanning electron microscope analysis of the fracture surface of the XNBRL‐PF indicated that the XNBRL were uniformly dispersed in the PF matrix, with diameters ranging from 200 to 400 nm. The results of Fourier transform infrared spectroscopy proved that chemical reaction occurred between XNBRL and PF matrix, which can greatly improve the interface interaction between rubber particles and PF matrix. Thermogravimetric analysis test showed that the incorporation of XNBRL can improve the thermostability of PF at low temperatures. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

Mechanical properties and microstructure of acrylonitrile–butadiene rubber vulcanizates reinforced by in situ polymerized phenolic resin

The phenolic resin (PF) was incorporated into acrylonitrile–butadiene rubber (NBR) vulcanizates by in situ polymerization during the vulcanization process. It was found that the tensile strength, tearing strength, and tensile strength (300% elongation) could be considerably enhanced 59.4, 80.2, and 126.4%, respectively, at an optimum PF content of only 15 phr, but the elongation at break and shore A hardness were only slightly affected on the basis of silica‐reinforced NBR vulcanizates. A systematic study of the PF structure formed within the NBR matrix using various experimental schemes and procedures has revealed that the PF resin would form the localized discontinuous three‐dimensional interconnected network structures in the NBR matrix. The substantial reinforcement of PF on the mechanical properties of vulcanized NBR were attributed to the morphology, high flexibility, and moderate stiffness of the PF phases and their excellent bonding with rubbers through “rubber to rubber” and interface layer. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

PF/NBR/SiO2三元杂化网络结构复合材料的研究

在理论分析的基础上,提出了PF／NBR／SiO2三元杂化网络结构复合材料的微观聚集态模型;通过溶胶一凝胶反应使正硅酸乙酯在酚醛树脂(PF)中发生原位聚合反应,制得PF／二氧化硅(SiO2)二元杂化复合材料;再将PF／SiO2二元杂化复合材料与丁腈橡胶(NBR)混炼杂化,制得PF／NBR／SiO2三元杂化网络结构复合材料。性能测试结果表明,与不合SiO2的PF／NBR复合材料相比,PF／NBR／SiO2三元杂化网络结构复合材料的密度、冲击强度、拉伸强度、拉伸弹性模量及断裂伸长率、玻璃化转变温度均有较大提高。     

Polymer blends of carboxylated butadiene‐acrylonitrile copolymer (nitrile rubber) and polyamide 6 developed in twin screw extrusion

Polymer blends of carboxylated butadiene‐acrylonitrile copolymer (nitrile rubber) and polyamide 6 (PA6) were developed in twin screw extrusion. The rubber was cured with SP 1045 methylol phenolic resin during melt mixing in twin screw. Effect of degree of carboxylation in the rubber phase on blend properties has been assessed. Phase morphologies have been characterized using transmission electron microscopy. A compatibilizing NBR‐g‐Nylon 6 graft copolymer generated in situ during melt mixing via interfacial reaction between the ? COOH groups in NBR and the ? NH₂ end groups in nylon 6 has been effective in generating a fine and stable dispersion of the rubber within the polyamide matrix. The graft copolymer has been characterized by DMTA. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci 104: 372–377, 2007     

无规则羧基丁腈橡胶改性环氧树脂的制备及性能研究

以无规则羧基丁腈橡胶（RCBN）为改性剂,对羧基丁腈橡胶改性环氧树脂的制备工艺及产品性能进行了研究。利用红外光谱及化学分析法等手段,探讨了催化剂用量、反应温度和反应时间对改性环氧树脂性能的影响;通过固化产物力学性能分析,对改性环氧树脂固化性能进行了评价。结果表明：质量配比为环氧树脂：RCBN：催化剂为100：15：0．3的反应体系中于120℃,反应150min,获得了环氧值0．40、黏度（40℃）90—95Pa·s、酸值小于0．4mg／g的改性环氧树脂产品,改性环氧／改性胺411固化产物剪切强度为18．41MPa,断裂伸长率为4．41％;无规则羧基丁腈橡胶对环氧树脂有显著的增韧效果。     

Toughening epoxy resins with solid acrylonitrile–butadiene rubber

The feasibility of using solid acrylonitrile–butadiene rubbers (NBR) with 19 and 33% w/w acrylonitrile to toughen diglycidyl ether of bisphenol A (DGEBA) epoxy resins has been investigated. Thermal analysis experiments revealed a two‐phase morphology of these rubber‐modified epoxies. However, the higher content of acrylonitrile in the rubber caused better compatibility between NBR and the epoxy resin. The rubber with 33% acrylonitrile was found to be an effective toughening agent for DGEBA epoxy resins. Fracture surface studies and also the high tensile strength of crosslinked high molecular weight NBR suggest that the toughening effect should arise from rubber bridging and tearing mechanisms. © 2000 Society of Chemical Industry     

碳纤维布表面处理对酚醛树脂复合材料力学性能的影响

以碳纤维布(CB)为增强相,丁苯橡胶为增韧剂,酚醛树脂(PF)为基体,通过模压成型工艺制得了PF/CB复合材料,研究了CB表面处理方式、丁苯橡胶含量及加工成型温度对PF/CB复合材料的界面结合及力学性能的影响。结果表明,丙酮处理CB、氧化处理CB及加工成型温度的提高都能改善纤维与基体的结合程度,提高界面结合力。但氧化处理CB随着加工成型温度的提高,易断裂,对复合材料的增强作用有所减弱。丁苯橡胶加入量为12%时PF的加工及冲击性能为最佳。     

酚醛泡沫塑料的新进展

综述了酚醛泡沫塑料及其树脂改性、配方组成、生产工艺、生产类型及应用领域的新进展。其中,酚醛泡沫树脂的改性包括:烷基酚共聚改性,腰果壳油增韧,聚乙烯醇改性,聚氨酯齐聚物、预聚物改性,丁腈胶共混改性;配方组成中,还介绍了可供选择的发泡用高性能酚醛树脂商品和各种用途的酚醛泡沫塑料的典型配方。     

增韧剂对环氧树脂性能的影响

研究了液体聚硫橡胶、液体丁腈橡胶(包括端羧基和端羟基丁腈橡胶)、聚醚和聚酯树脂、聚氨酯预聚体等对环氧树脂的增韧改性,结果显示增韧后的环氧树脂的粘接强度和抗冲击强度显著增加。     

An Intumescent-Like Flame-Retardant Effect of Hollow Carbon Precursor on Acrylonitrile–Butadiene–Styrene/Oligomeric Aryl Phosphate/Novolac Epoxy Composites

An intumescent-like char layer was formed by introducing hollow phenolic microspheres into acrylonitrile–butadiene–styrene/oligomeric aryl phosphate/novolac epoxy resin. Acrylonitrile–butadiene–styrene-grafted maleic anhydride was used to improve their compatibility. Combustion and thermal degradation behaviors were studied. The results showed that the ABS composites containing 25 wt% oligomeric aryl phosphate/novolac epoxy (3/2) obtains a limiting oxygen index as high as 50; however, it cannot be classified in the UL-94 test. Combination of oligomeric aryl phosphate/novolac epoxy, acrylonitrile–butadiene–styrene-grafted maleic anhydride, and hollow phenolic microspheres (23/10/2) improves the UL-94 grade of acrylonitrile–butadiene–styrene composites to V-1. A continuous and compact porous intumescent-like char layer is generated during combustion; thus, better flame retardancy is obtained.