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。     

碳化二亚胺抗水解剂的研究进展

综述了碳化二亚胺类抗水解剂的国内外研究进展,并对碳化二亚胺抗水解剂的结构、用途、合成方法和作用机理进行了详细的介绍。     

不同类型抗水解剂应用于PET材料的抗水解效果评价

碳化二亚胺抗水解剂能有效抑制聚酯材料水解老化,提高PET等聚酯材料的使用性能,延长使用寿命。本文选用4种含有不同类型抗水解剂的PET材料,从抗水解PET制品的颜色、力学性能、特性黏度、热稳定性、抗光老化性能、抗水解效果等方面进行评价。结果表明,应用于PET材料中,单体型碳化二亚胺抗水解剂抗水解效果最优;均聚合型碳化二亚胺抗水解剂抗水解效果优于共聚合型碳化二亚胺抗水解剂;液体型碳化二亚胺抗水解剂抗水解效果较差。     

小产品，大文章——记抗水解剂专家上海莱安实业有限公司

正很多材料尤其是含酯键、酰胺键的聚合物材料在较高温度和湿度下,由于水解而造成产品泛黄,性能下降,使用寿命变短。可是只要加入百分之一甚至千分之一的抗水解剂,就能够基本抑制水解的进程,让产品保持良好的性能和使用寿命。这种神奇的抗水解剂是什么呢?就是以德国最先研发出的碳化二亚胺和聚碳化二亚胺为核心结构的化合物或者聚合物添加剂。     

聚合型碳化二亚胺抗水解剂的合成与表征及其在PBAT材料中的抗水解研究

制备了两种聚合型碳化二亚胺抗水解剂A和B,通过红外光谱、热重分析等对其进行了表征;并研究了抗水解剂A、抗水解剂B和市售单体型碳化二亚胺Stabaxol I对聚己二酸对苯二甲酸丁二醇共聚酯(PBAT)抗水解性能的影响。采用聚合型碳化二亚胺抗水解剂A和B改性的PBAT比采用Stabaxol I改性的PBAT具有更加优越的抗水解性能;添加质量分数0. 1%的聚合型碳化二亚胺的PBAT材料的抗水解性能与添加质量分数0. 6%Stabaxol I的PBAT材料的抗水解性能相当,同时抗水解剂A和B均能显著降低高熔体质量流动速率(MFR) PBAT的初始MFR。     

混炼型聚氨酯橡胶的稳定性

高强度、高耐磨的聚氨酯橡胶一直是橡胶制品领域用途极大的一类品种,对其研究也在不断深入。针对聚酯型聚氨酯的抗水解问题和聚醚型透明聚氨酯的抗紫外、抗褪色问题进行了研究,指出分别将碳化二亚胺作为抗水解剂和将AO-10(或AO-15)、HALS-65、UV-28的组合作为抗紫外、抗褪色剂,能较好地解决上述两个问题。     

碳化二亚胺抗水解剂结构对聚酯薄膜性能的影响

制备了2种聚酯薄膜,分别添加不同分子结构的碳化二亚胺抗水解剂,对比测试其PCT老化前后中的特性黏度、端羧基值含量、断裂伸长率和水蒸气透过率等指标,同时分析2种薄膜的热行为,进而研究碳化二亚胺对聚酯分子的作用机理,以及对聚酯薄膜性能的影响,并分析了这2种碳化二亚胺作用机理的不同之处和原因.     

聚碳化二亚胺对聚乳酸抗水解性能的影响

主要研究加入不同质量分数(0.3%、0.6%、1.0%、2.0%)抗水解剂聚碳化二亚胺(PCI)的聚乳酸(PLA)在95℃热水中水解0、1、2、4、8 h后的水解性能.通过端羧基滴定法、凝胶色谱法(GPC)、流变稳态扫描、差示扫描量热测定法(DSC)和拉伸性能测试对水解前后的样品性能进行了研究.结果发现:聚碳化二亚胺是聚乳酸有效的抗水解剂,抗水解性能随着抗水解剂添加量的增加而增强.     

聚合级碳化二亚胺的合成及湿热老化研究

使用2,4,6-三乙基-1,3-苯二胺和三光气为原料,采用异氰酸酯法合成聚三乙基-1,3-苯碳化二亚胺(PAH),经过两步反应后最终得率为66％.用红外和核磁共振进行了结构分析,PAH具有明显的碳化二亚胺结构.通过DSC和TG对PAH抗水解剂的熔点和耐热性能进行了系统评价,PAH没有明显熔点,是一种非晶聚合物,熔程为1...     

一种新的用于聚酯型聚氨酯和TPU的液态碳化二亚胺水解稳定剂

在聚酯型聚氨酯和TPU中，加入1％和2％的液态碳化二亚胺、经80℃水中老化试验发现弹性体的扯断伸长率在第11天达到最高值，从而证实．液态碳化二亚胺水解稳定剂能赋予弹性体较好的水解稳定性。     

聚氨酯材料的降解机理及其稳定剂

综述了聚氨酯(PU)材料的光降解、热氧化降解、水解等降解机理,以及用作光稳定剂、热氧化稳定剂、水解稳定剂的产品种类及其协调作用.聚氨酯材料的使用环境不同,降解机理也不同,正确选用稳定剂并进行应用是提高PU材料性能的一种简单而有效的手段.     

Thermoplastic polyurethane hydrolysis stability

This paper reviews several types of thermoplastic polyurethane elastomers, and the unique properties these polymers have. In discussing the hydrolysis stability of thermoplastic polyurethane elastomers the suitability of these polymers for such study was pointed out. A relationship between poly(ester-urethane) composition in terms of methylene group concentration, hardness and chain stiffness, and hydrolysis stability was shown. The dominant role of polyurethane acid number in thermoplastic poly(ester-urethane) hydrolysis stability was demonstrated and the origin of this unexpected acid number was discussed. The pronounced stabilizing action of added poly(carbodiimide) in thermoplastic poly(ester-urethane) hydrolysis was shown, as well as the severe destabilizing action of a carboxylic acid, stearic acid. The hydrolysis stabilities of thermoplastic poly(ester-urethane) elastomers based on poly(?-caprolactone) glycol and on poly(hexamethylene carbonate) glycol were also described.     

聚氨酯的化学降解及其性能

简单介绍了聚氨酯的水解、热降解、热氧化降解和紫外线降解的反应机理。举例比较了加入或未加入稳定剂的聚氨酯弹性体在降解试验前后的拉伸强度及其它性能变化,指出了添加稳定剂可改善聚氨酯弹性体的抗降解稳定性。     

Polyurethane/Siloxane Hybrid Polymers with Chemiluminescent Mechanophores as Stress Probes

A series of mechanoluminescent polyurethane/siloxane hybrid polymers are synthesized through mild polycondensation and sol–gel hydrolysis process with 1,2‐dioxetane as the mechanophore. With joint advantages of polyurethanes and silicon‐containing polymers, these hybrid polymers exhibit good mechanical strength, high elasticity, and water resistance properties. Herein, 1,2‐dioxetane acts as an autoluminescent probe of chain scission, which could emit visible and sensitive signals of the covalent bond breaking in these hybrid polymers under mechanical force. Thus, chain scission and chain slipping events during the failure process of these polymers can be effectively discriminated. The current work will offer exciting opportunities to study the failure process of hybrid polymers with unprecedented temporal and spatial resolutions.     

Recent advances in interpenetrating polymer networks

We review the synthesis, morphology, and physical and mechanical properties of IFNs as well as the related pseudo-IPNs, in which only one of the polymers is crossliriked. Recent studies have shown that the degree of phase separation achieved in these materials is strongly dependent on the compatibility of blends of the linear polymer constituents of the IPN components as well as the kinetics of chain extension and the presence of grafting between component polymers. We illustrate this by a series of IPNs consisting of a polyurethane and an acrylic copolymer. The acrylic is a typical automotive enamel. An enhancement in properties results, which is dependent on the amount of grafting and the kinetics of polymerization. Also discussed are IPNs of a polyurethane and an epoxy, which exhibit a synergism in adhesive properties, and IPNs of a RIM polyurethane with several epoxies and unsaturated polyesters. In addition, also reported are the preliminary studies on the first successful preparation of a three-component IPN, consisting of a polyurethane, an epoxy, and an acrylic.     

水性含磷聚合物在涂料中的应用研究进展

水性含磷聚合物具有良好的热稳定性、耐腐蚀性等优点,是一种重要的环境友好型材料。本文主要介绍了水性含磷丙烯酸类和聚氨酯类等重要的水性含磷聚合物,并对这两种聚合物的合成及其在水性防火涂料和防腐涂料中的应用进行了讨论。分析结果表明：以水性含磷聚合物为基料的防火涂料热稳定性较好,成炭率明显增加,阻燃性能大大提高;以水性含磷聚合物为基料的防腐涂料,漆膜附着力增强,防腐性能提高。提出今后的研究方向是：①将磷与卤素、氮、硅等元素同时引入水性聚合物中,以协同阻燃;②将含磷基团引入聚合物分子内,作为基料来提高阻燃性能。     

Effect of Talc Filler on Physical Properties of Polyurethane Rigid Foams

This article reports on the properties of polyurethane rigid foams, which are used as insulating materials. Most polyurethane rigid foams, derived from cellular polymers, are unstable and tend to crack when acted upon by external forces. These foams are classified as a subgroup of cellular polymers, and thus their low stabilization levels can be partly explained by the fact that they contain cells. In these experiments, we attempted to add talc, to polyurethane rigid foams, as a filler, in an attempt to investigate its effect on the physical properties of the constructed foams in both horizontal and vertical directions. Physical and comparative tests were performed on various compositions of polyurethane foam to chart their insulating capabilities, and our comparative analysis indicated that advances had been achieved with respect to some of its properties.     

聚氨酯材料的老化降解

评述了聚氨酯材料在紫外线，水，热氧及化学介质条件下的老化降解机理；综述了聚氨酯材料老化降解的研究进展。     

模板预处理对泡沫炭结构的影响

以聚氨酯泡沫为模板,糠醇为碳源,采用模板法制得块状泡沫炭材料,扫描电镜(SEM)观察发现：产品是由大孔组成的、具有网状结构的多孔材料。研究了不同炭化终温对产品形貌、残炭率和体积收缩率的影响;考察了对模板聚氨酯泡沫进行NaOH水解预处理的条件,即水解时间、水解温度和碱液浓度对模板及产品结构的影响。结果表明,模板的预处理去除了聚氨酯泡沫闭孔上的隔膜,提高了泡沫的浸渍能力,制得了具有更高开孔率、残炭率以及体密度的产品,说明模板预处理是改善产品结构和性能的有效手段。     

热塑性聚氨酯共混改性研究进展

综述了热塑性聚氨酯与聚烯烃、聚苯乙烯、工程塑料(聚碳酸酯、ABS、聚甲醛、苯乙烯一丙烯腈共聚物、聚酰亚胺、聚酰胺等)、环氧树脂、橡胶、短纤维、聚氯乙烯树脂等共混研究进展,共混改性后的材料在某些性能上得到提高或改善,共混的研究为开发新材料提供了新途径,扩大了热塑性聚氨酯的应用。