二烯型热塑性聚氨酯在橡胶配方中的应用

聚氨酯材料拥有许多理想的性能，但由于与橡胶体系之间的兼容性差而在传统的橡胶配方中没有获得广泛应用。本文介绍了2035TPU聚丁二烯型热塑性聚氨酯的性能，证实了它能够用作胶料与聚氨酯组分之间的共硫化型粘合层，探索了它在传统胶料中可能会有哪些用途。     

二烯烃基热塑性聚氨酯在橡胶配方中的应用

典型的热塑性聚氨酯（TPUs）是以聚醚或聚酯柔性链段为基础的。与苯乙烯三嵌段热塑性弹性体（TPE）制品不同,在传统的橡胶配方中,这些TPUs没有被广泛利用。极性形态不能完全溶解于二烯烃橡胶,或者不能用硫黄硫化剂有效地硫化。然而,基于二烯类预聚物的,TPU,因为呈现出既有橡胶态柔性链段又有氨基甲酸乙酯键的新形态而能提高与橡胶胶料的相容性。     

热塑性聚氨酯在制鞋材料中的应用

通过在热塑性聚氨酯 (TPU)中加进表面改性硫化橡胶粒子及交联剂、软化剂、发泡剂等助剂 ,来实现TPU取代聚氨酯 (PU)鞋材。在性能方面 ,克服了PU防滑性不足的同时其它性能基本保持相近。在价格方面与PU相当。     

含磷阻燃剂在热塑性聚氨酯中的阻燃应用

综述了国内外近10年来含磷阻燃剂在热塑性聚氨酯(TPU)材料中应用研究的新进展。介绍了相关含磷阻燃剂的组成,阻燃机理,以及它们在热塑性聚氨酯材料中的阻燃应用。     

聚氨酯热塑性弹性体的应用开发

１何谓热塑性弹性体 热塑性弹性体（ＴＰＥ）是近二十年来受人关注而获得很快发展的一种高分子合成材料,它既有硫化橡胶的应力应变特性——形变随应力的消失而迅速消除,又有热塑性塑料的加工特性——在力与热的作用下能反复熔融流动,制品不经硫化而呈现橡胶的弹性。不论何种热塑性弹性体其分子结构均由“软段”和“硬段”两部分组成。所谓“软段”是指柔软的线型长分子链,它使ＴＰＥ具有一定的弹性形变;“硬段”是指较短的刚性链,它使ＴＰＥ具有一定的刚性和耐热性。所以也可以说热塑性弹性体是介于硫化橡胶和热塑性塑料之间的一种高…     

热塑性聚氨酯及其进展

<正> 热塑性聚氨基甲酸酯弹性体(简称TPU),1950年B.F Goodrich实验室的Schollenberger等人开始研制,并在1958年定名为Polyurethane Vc,后经改良,于1961年才以Estane Vc商品名投入市场。1965年日本也开始商品化。 TPU一经问世,便引起人们极大的     

基于二烯烃的热塑性聚氨酯

美国《橡胶世界》2008年238卷2期54页报道：全球特殊化学品生产商Sartomer公司研制出一种基于二烯烃的热塑性聚氨酯——TPU7840,该产品专为橡胶和塑料市场设计。据称,加入TPU7840可使通用橡胶具有聚氨酯的某些性能。这种基于二烯烃预聚物的热塑性聚氨酯既有橡胶的软链段,又有聚氨酯的硬链段。TPU7840可采用常规橡胶和热塑性塑料加工设备进行加工,     

热塑性聚氨酯制品的熔接

1前言热塑性聚氨酯材料是目前国际上研究和开发的热门课题。它具有高强度、高耐磨、耐老化、耐高温等优异性能，及其生产工艺简单、效率高、生产设备投资少的特点。该材料在国内仍处于开发试用阶段，至今在报刊及文献中极少涉及有关此类材料熔接的详细报导和阐述。本文通过对德国Bayer公司和国内天津原料生产的热塑性聚氨酯制品的熔接试验，阐明了热塑性聚氨酯材料（TPU）熔接过程中所要注意的问题，探讨了它特有的性能，以供同行参考。2材料热塑性聚氨酯材料（TPU）是由德国Bayer公司和天津塑料化工厂生产。该材料通过实验室用挤出机生…     

A new process for crosslinking thermoplastic polyurethanes using rubber industry techniques

New polyurethane materials were obtained after chemical modification of a commercial thermoplastic polyurethane (TPU) using diisocyanates and diols or diamines. The reaction can be easily processed by the well‐known calendering technique often used by the rubber industry. It leads to a remarkable improvement of the thermomechanical properties of the material, due to the formation of chemical crosslinks between the TPU chains (“vulcanization”). As this new processing consists only of an intimate mixing of the starting TPU with solid reagents, followed by molding and curing stages, it allows the use of any and possibly highly reactive solid monomer (especially damines), which could not otherwise be considered except with constraining techniques like RIM; in the same way, the incorporation of organic or inorganic fillers also becomes possible.     

Seawater degradable thermoplastic polyurethanes

Degradable thermoplastic polyurethane (TPU) elastomers incorporating poly(D ,L ‐lactide‐co‐glycolide) (PLGA) were synthesized and characterized. The soft segments consisted of a mixture of poly(butylene adipate) (PBA) and PLGA with PBA/PLGA ratios of 100/0, 75/25, and 50/50 wt %. Two PLGA polyesters were used. BD‐PLGA was initiated from butanediol; whereas BHMBA‐PLGA was initiated from 2,2‐bis‐(hydroxymethyl)butanoic acid. The hard segments consisted of dicyclohexylmethane‐4,4′‐diisocyanate (H₁₂MDI) and 1,4‐butanediol (BD). The hard segment content, expressed as the weight ratio of BD to polyol used in the TPU formulation, was set either at 8 or 12% (31.2 or 38.1% hard segment by weight, respectively). In all cases initial [NCO]/[OH] ratio was 1.03. The tensile modulus of the TPUs ranged from 9 to 131 MPa and ultimate strains ranged from 100 to 750%. DMA was used to probe the thermomechanical transitions of the TPUs and indicated useful application temperatures from well below zero up to 60–80°C depending on the formulation. Hydrolytic degradation of the TPUs was tested in seawater at 37°C. All of the PLGA‐containing TPUs showed enhanced degradation compared to those with only PBA as the soft segment. The latter compositions remained essentially unchanged throughout the test while the PLGA‐containing TPUs lost as much as 45% of their initial mass in 153 days. Molecular weights of TPUs containing degradable polyols were lower than those derived from 100% PBA polyol. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

滑石—硅灰石复合矿物填充剂应用于硅橡胶

硅灰石等天然矿物通过超细粉碎和表面改性制成了性能较好的硅橡胶补强填充剂,探讨了没的粒长、偶联剂以及复合填充剂地硅橡胶力学性能的影响,制成的硅橡胶补强填充剂可部分取代白炭黑。     

耐热橡胶配合

由于相对于工其他材料，像胶团料耐热性较着，高温下对其机械性能影响较大。本文首先对耐热橡胶做了较全面的概述，介绍了其范畴及应用范围，再从橡胶胶料、主材结构、硫化体系、防护体系4个方面描述其配方设计的要点，着重论述了不同硫化体系对耐热橡胶性能的影响，最后简述了橡胶的耐热与抗返原的关系，列出了其产生返原的原因和抗返原剂的类型。     

Utilization of lignins in rubber compounding

Lignin in the form of lignosulfonate containing about 33% moisture was found to be dispersible in natural rubber by dry mixing. Properties such as tear resistance, abrasion resistance, flex crack resistance, and crack growth resistance improved upon addition of lignin, irrespective of the nature of filler added. This lignin was found to have negative effects on modulus, tensile strenght, resilience, heat buildup, and compression set, which showed, however, remarkable improvement upon aging.     

Ultrasonic detection of segmental relaxations in thermoplastic polyurethanes

The change in attenuation of longitudinal waves has been measured as a function of frequency and temperature for thermoplastic polyurethanes of different hardness covering a range from rubbery hardness to plastic. Analysis of the results show some segmental relaxations and the activation energies were calculated from the ultrasonic measurements. These activation energies were indirectly related to the fatigue failure of the polymer. This failure was expressed as cut growth.