盾构机主驱动超大聚氨酯密封圈的研制及工程应用

针对盾构机主驱动超大聚氨酯（PU）密封圈（简称PU密封圈）在生产及应用中存在的问题,利用有限元分析软件Ansys对PU密封圈结构进行仿真优化;研究了主要原材料对PU弹性体性能的影响;进一步对PU密封圈的生产环境、配套设备和工艺以及产品评测平台进行优化设计,形成了整套自动化连续硫化生产技术,确保了盾构机主驱动PU密封圈的质量稳定性和在实际工程中良好的应用效果。     

上海尤恩牌产品三款

聚碳化二亚胺UN-03聚碳化二亚胺UN-03是一种高效抗水解剂,对聚氨酯和大多数塑料都非常有效,如PU、TPU、PET、PBT、TPEE、PA、EVA等。作为抗水解添加剂能提供聚氨酯制品的长效耐水解性能,如粘合剂、鞋底料、电缆护套、密封圈、传送带、滑轮等,也可用于PET工程塑料、纤维、滤网、薄膜、PA工程塑料、纤维、管材等。     

大军未动，粮草先行——记天宝聚氨酯制品有限公司的电子商务拓展行动

主营产品:促销PU礼品,PU玩具杭州临安天宝聚氨酯制品有限公司是一家专业生产PU发泡玩具的厂家,成立于06年3月。而早在两个月前,公司管理层就决定就投入了近十万元,先行打造了一个电子商务平台——阿里巴巴"高级中国供应商"。当时,工厂既没有选好厂房、购置好设备,也没有招聘到工人和操作人员。公司总经理解释说,这就是打仗前的"大军未动,粮草先行"。     

巴斯夫拟在浦东新建PU特种制品基地

巴斯夫计划在上海浦东投资建设PU特种制品基地，包括装置工厂，TPU生产装置和技术研究与开发中心。目前，巴斯夫正进行产品开发工作以尽快扩大中国PU市场。     

专用合成树脂及其制品

巴斯夫聚酰胺成功用于塑料微型天线；中国PU基地即将在上海形成；俄罗斯新建6．5万t／a聚碳酸酯装置；生物基多元醇PU泡沫的发展方向     

汽车工业发展促进PU消费

随着中国汽车工业飞速发展，尤其是轿车产量的快速增加；PU制品在汽车内、外饰件上的应用量日益增大。尤其PU泡沫在汽车坐垫、NVH系统均有大量应用。     

专用合成树脂及其制品

BASF投资 1亿欧元拟在浦东建大型PU厂BASF公司计划在上海浦东建专用树指生产厂 ,以提升和扩展他在亚洲聚氨酯 (PU )经营业务。该公司预定该厂于 2 0 0 7年初开始生产适合中国用户的专用PU。据悉 ,该项目投资约 1亿欧元 (1 2 2亿美元 ) ,已获得上海当局批准 ,计划于 2 0 0 5年开     

美国密封制品市场需求将呈现强劲增长态势

根据美国工业市场研究公司的研究报告，美国对橡胶密封圈的需求将以每年3．9％的速度递增，在2015年达到8．4亿美元。[第一段]     

聚氨酯的应用和开发研究

1聚氨酯的应用 聚氨酯（PU）树脂是由异氰酸酯与多元醇反应制成的一种具有氨基甲酸酯链段重复结构单元的聚合物。聚氨酯制品可分为泡沫制品和非泡沫制品两大类，而泡沫制品有软质、硬质、半硬质之分，非泡沫制品则包括涂料、胶粘剂、弹性体和弹性纤维（氨纶）等。聚氨酯材料性能优异，用途广泛，其各种不同的制品可以用于众多领域。     

BASF在上海浦东投资建PU装置

BASF拟在上海浦东投资建新PU特制品基地．它包括装置工厂、TPU生产装置和技术研究与开发中心。工厂将进行产品开发工作以尽快扩大中国PU市场。预计，今后10年年均增长率将达10％．成为2015年世界最大的市场。     

我国聚氨酯产业发展评析

对我国聚氨酯产业的发展进行了评述,重点介绍了目前国内聚氨酯产业的特点和研究开发热点,指出我国PU区域分布格局将逐渐形成,建筑节能、汽车工业、高铁、地铁、家电、新能源和环保是拉动我国PU发展的重要动力和新的经济增长点。     

1990年国内聚氨酯工业概况

简单评述了我国1990年聚氨酯生产、消费结构和新产品的研究状况。内容包括多元醇、异氰酸酯、助剂、软质和硬质泡沫、弹性体和合成革、涂料和复合涂料、粘结剂和密封剂、加工设备等。     

聚氨酯填充型泡沫混凝土复合材料的性能研究

将不同掺量聚氨酯(PU)加入泡沫混凝土(FC),研究聚氨酯填充型泡沫混凝土(FC/PU)复合材料的性能。结果表明:随着PU掺量的增加,FC/PU复合材料的导热系数不断降低,阻燃性能变差。PU掺量为0~4%时,随着PU掺量的增加,FC/PU复合材料的浆体黏度逐渐降低,气孔特性变好,抗压强度不断增大。PU掺量超过4%时,FC/PU复合材料黏度开始增大,气孔特性变差,抗压强度逐渐降低。PU掺量为4%时,FC/PU复合材料的综合性能最优,与未掺入PU相比,黏度降低62.7%,气孔特性较好,抗压强度提高75.0%,导热系数降低18.7%,阻燃性能仍能达到A1级。     

Damping properties of interpenetrating polymer networks of polyurethane‐modified epoxy and polyurethanes

Interpenetrating polymer networks (IPNs) were prepared from polyurethane (PU)‐modified epoxy with different molecular weight of polyol and polyurethanes based on the mixture of polydiol and polytriol by a one‐shot method. Two types of PU‐modified epoxy: PU‐crosslinked epoxy and PU‐dangled epoxy were synthesized, and the effects of the different molecular weights of polyol in the PU‐modified epoxy/PU IPNs on the dynamic mechanical properties, morphology, and damping behavior were investigated. The results show that the damping ability is enhanced through the introduction of PU‐modified epoxy into the PU matrix to form the IPN structure. As the molecular weight of polyol in PU‐modified epoxy increases, the loss area (LA) of the two types of the IPNs increases. PU‐dangled epoxy/PU IPNs exhibit much higher damping property than that of the PU‐crosslinked epoxy/PU IPNs with 20 wt % of PU‐crosslinked epoxy. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 328–335, 1999     

Performance properties of self-curing aqueous-based PU system with tri-glycidyl phosphate curing agent

Amino-terminated and carboxylic acid containing aqueous-based polyurethane (PU) dispersion was prepared by a conventional NCO-terminated PU prepolymer process by using isophorone diisocyanate (IPDI), polypropylene glycol-2000 (PPG-2000) and 2,2′-dimethylolpropanoic acid (DMPA) as the key raw materials. A new curing agent, tri-glycidyl phosphate (POG) was prepared from a substitution reaction of phosphorus oxychloride and glycidol. A single-component self-curable aqueous-based PU system is obtained from an addition of POG into aqueous-base PU dispersion and its curing reaction occurred among POG oxiranes and PU amino groups immediately after hydrophobic POG diffused into PU particles (as polymeric micelles). The cross-linked PU resins were resulted on drying at ambient temperature. Original PU dissolved into THF and ethanol. And its gel content increased to 90.1% and sample loss in ethanol decreased to 9.2% of this self-cured PU system with 5.0 phr POG. The limiting oxygen index (LOI) value is 20 of original PU and its LOI reached to 27 of this same self-cured PU system. The improved mechanical and thermal properties of those self-cured PU resins were evaluated, respectively in this report.     

Effect of using sepiolite silicate + fumed silica mixtures as fillers on the characteristics of solvent-based polyurethane adhesives

Abstract —Both fumed silica and sepiolite have been used as a filler of polyurethane (PU) adhesives. Although effective, the small particle size and the relative high cost of fumed silica are limitations in some applications. Sepiolite is cheaper than fumed silica, but its relatively large particle size facilitates its settling from the adhesive solutions. In this study, the usefulness of using sepiolite + fumed silica mixtures as a filler in solvent-based PU adhesives is demonstrated. The rheological and adhesion properties of the PU adhesive solutions and the rheological and mechanical properties of the PU films (without solvent) were studied. SEM micrographs of PU films showed the morphology and compatibility of the fillers with the PU matrix. The use of sepiolite + fumed silica mixtures inhibited the settlement of the filler from the PU adhesive solutions, increased both the storage and the loss moduli, and improved the rheological and mechanical properties of the PU. On the other hand, the green (immediate) T-peel strengths of roughened styrene-butadiene rubber/PU adhesive joints and plasticized PVC/PU adhesive joints were greatly improved in filled PU adhesives. The effects produced by using fumed silica alone or sepiolite + fumed silica mixtures were very similar, although in general, somewhat more marked in fumed silica-filled PU.     

软包装用聚氨酯胶黏剂发展近况

简要介绍了软包装及所用聚氨酯(PU)复膜胶的迅猛发展历程.分别介绍了溶剂PU胶黏剂、醇溶PU胶黏剂、无溶剂PU胶黏剂和水性PU(WPU)胶黏剂的发展概况及其优缺点.随着技术进步和环保意识的增强,PU复膜胶由溶剂型逐步向无溶剂、水性方向发展.还介绍了将丙烯酸酯基团引入WPU主链以降低成本、改进某种性能、引人双键等方面的研...     

活性端基聚氨酯橡胶改性不饱和聚酯树脂的研究(Ⅱ)

通过在不饱和聚酯树脂中加入活性端基聚氨酯橡胶来降低树脂的体积收缩.树脂固化前,橡胶与不饱和聚酯树脂相溶性好;树脂固化时橡胶中的不饱和双键反应可参与反应,并呈一定粒径的胶粒析出.本文研究了几种活性端基聚氨酯橡胶对不饱和聚酯树脂收缩控制的影响.     

Interpenetrating polymer networks of polyurethane and furfuryl alcohol,IIa. Processability and properties of pultruded fiber-reinforced composites

A feasibility study of pultrusion of fiber-reinforced polyurethane/furfuryl alcohol (PU/FA) interpenetrating polymer/network IPN composites has been made. From the viscosity study, it was found that the pot life of the PU/FA IPN prepolymers increased with PU content and showed high reactivity at elevated temperature. It was confirmed from the morphological study that the wetting of fibers by the PU/FA IPN resins was improved with PU content. The appearance of the tensile failure surfaces of the pultruded glass fiber-reinforced PU/FA IPN composites showed “hackle patterns” for PU contents below 15 phr. The mechanical property study shows that the tensile strength of pultruded PU/FA IPN composites is the highest when the PU content is 5 phr. However, the flexural strength, flexural modulus and HDT decreased with PU content. The mechanical properties of various fiber-reinforced (glass, carbon, and Kevlar 49 aramid fiber) pultruded PU/FA IPN composites increased with fiber volume content.     

Surface‐modifiers of clay on mechanical properties of rigid polyurethane foams/organoclay nanocomposites

Three different surface modifiers, octadecyl trimethyl ammonium (ODTMA), octadecyl primary ammonium (ODPA), and decanediamine (DDA) were used to modify Na⁺? montmorillonite (MMT), and the resultant organoclays were coded as ODTMA‐MMT, ODPA‐MMT, DDA‐MMT, respectively. Rigid PU foams/organoclay composites were prepared by directly using organoclay as the blowing agent without the addition of water. Investigation shows that the morphology of the nanocomposites is greatly dependent on the surface modifiers of clay used in the composites. In detail, DDA‐MMT is partially exfoliated in the PU matrix with the smallest cell size, while two others are intercalated in the PU matrices with smaller cell sizes. The sequence of their cell sizes is pristine PU foams > rigid PU foams/ODTMA‐MMT > rigid PU foams/ODPA‐MMT > rigid PU foams/DDA‐MMT, and the average cell size of rigid PU foams/DDA‐MMT composites decreases evidently from 0.30 to 0.07 mm. Moreover, all rigid PU foams/organoclay composites show remarkable enhanced compressive and tensile strengths as well as dynamic properties than those of PU foams, and the enhancement degree coincides well with the relative extent of internal hydrogen bonding of materials and gallery spacing of organoclay. For example, in the case of rigid PU foams/DDA‐MMT composite, 214% increase in compressive strength and 148% increase in tensile strength compared with those of pure PU foams were observed. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007