黏弹性聚氨酯在吸声和绝热方面的应用

正WO2016153664在绝缘体构件的表面有一层黏弹性聚氨酯海绵。该黏弹性聚氨酯海绵材料根据ASTM3574标准测量,此黏弹性聚氨酯海绵材料的弹性值最大为20%;根据ASTM D3574测试M测量,黏弹性聚氨酯海绵材料的恢复时间至少3 s;黏弹性聚氨酯海绵材料由芳香聚异氰酸     

《聚氨酯弹性材料及原料单体生产技术经验交流座谈会》在山西太原召开

一九八二年十一月七日——十三日化工部炼化司在山西太原市召开了<聚氨酯弹性材料及原料单体生产技术、经验交流座谈会>。来自全国高等学校、科研、生产等八十三个单位的一百二十六名代表参加了会议。这是继去年杨州会议以来的第二次全国性行业会议。化工部特种合成橡胶科技情报中心站和化工部炼化司聚氨酯弹性材料调查组分别在大会上作了《国外聚氨酯弹性体的发展概况及趋势》及《全国聚氨酯弹性材料调查报告》。会上生产厂还介绍     

双组分聚氨酯弹性结构胶的制备及其性能研究

以聚醚多元醇、聚酯二元醇、二苯基甲烷二异氰酸酯(MDI)和小分子扩链剂为主要原料,复配制备了双组分聚氨酯弹性结构胶.研究了聚醚多元醇、聚酯多元醇、小分子扩链剂及催化剂添加量对双组分聚氨酯弹性结构胶性能的影响,以及环境温度对双组分聚氨酯弹性结构胶固化性能的影响.研究结果表明:当双组分聚氨酯弹性结构胶的聚醚组分中聚醚三元醇...     

一种光固化手感涂料的制备及性能研究

以弹性聚氨酯丙烯酸酯为主体,添加特殊改性脂肪族聚氨酯丙烯酸酯预聚物、消光粉、助剂等制备出了光固化手感涂料,该涂料具有良好的弹性、柔韧性、机械性能。讨论了弹性聚氨酯丙烯酸酯和特殊改性脂肪族聚氨酯丙烯酸酯预聚物的筛选及其对手感等性能的影响。     

弹性纤维熔纺聚合物研究的进展

介绍了非聚氨酯类、聚酯型聚氨酯类、聚醚型聚氨酯类聚合物及扩链剂在熔纺弹性纤维上的应用。指出 ,非聚氨酯类聚合物所熔纺的纤维具有较好的耐热性 ,耐氯性及定型性 ,弹性回复率较差 ,低于 95 %。用预聚体作交联剂的聚酯型聚氨酯熔纺纤维的弹性回复率高于前者 ,略低于聚醚型聚氨酯类。用芳香族二醇作扩链剂的聚醚型聚氨酯纤维 ,耐热性较好、弹性回复率较高 ,其性能接近溶液纺丝产品     

行业要览

<正>聚氨酯弹性涂料让易碎的东西坚硬无比的涂料从上世纪90年代开始,聚氨酯弹性涂料(特别是聚氨酯——聚氨酯聚脲共混弹性体)开始广泛的应用于工业。比如飞机的外层涂料大多是PU,下次坐飞机进舱门之前可以摸一把,体验一下那种又韧又弹的触感。聚氨酯弹性涂料可以很好的跟金属和混凝土等材料结合,如果喷得足够     

国际著名聚氨酯专家岩田君之来沪讲授

7月20日～21日,斐声聚氨酯世界的日本专家岩田君之先生来沪进行了技术讲授。岩田先生年逾70,从事聚氨酯工作50余年,迄今耕耘不息,在聚氨酯产品和技术上作出了杰出的贡献,他与其他名闻世界的聚氨酯专家撰写的《Urethane Handbook》已被聚氨酯业内人土奉为圭臬,出版多年至今世界人士争相阅读。岩田先生这次讲授的内容有:(1)热塑性聚氨酯及聚氨酯胶粘剂;(2)聚氨酯系硬质和弹性     

聚己内酯聚氨酯弹性涂料的研制

聚己内酯聚氨酯有耐氧化的聚酯键,而聚醚和聚酯型聚氨酯都不同程度含有易氧化降解的醚键,当户外曝晒时,则导致聚合物链的断裂。因此,聚己内酯聚氨酯弹性涂料不同于聚醚和聚酯型聚氨酯弹性涂料,有良好的耐候性及优良的水解稳定性。它是聚氨酯弹性涂料的一个新品种。     

欢迎订阅2005年度本站和聚氨酯弹性体专业委员会主办的专业技术资料

聚氨酯弹性材料技术情报咨询服务站是在全国范围内为聚氨酯行业提供服务的专业技术咨询单位，以专业性强、信息快、范围广、实用价值高为宗旨，竭诚为全行业提供技术信息服务。     

欢迎订阅2006年度本站和聚氨酯弹性体专业委员会主办的专业技术资料

聚氨酯弹性材料技术情报咨询服务站是在全国范围内为聚氨酯行业提供服务的专业技术咨询单位，以专业性强、信息快、范围广、实用价值高为宗旨，竭诚为全行业提供技术信息服务。     

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     

A Study on Structure and Mechanical Properties of Polyurethane/Organic-Montmorillonite Nanocomposites

The intercalated nanocomposites of polyurethane (PU) with organic-montmorillonite (OMMT) treated by cetryltrimethyl ammonium bromide was prepared. The interlayer spacing of PU/OMMT nanocomposites was 3–4 nm. The interface interaction of PU/OMMT nanocomposites was improved compared to that of PU/montmorillonite (MMT) composites. The orderly arrangement of the PU chains was hindered because of strong interface interaction between the silicate layers dispersed in the nanometer and PU chains. By adding 2 wt% OMMT to PU, tensile strength and tear strength of the PU/OMMT composites were increased from 10.5 MPa and 36.4 KN/m to 13.8 MPa and 42.2 KN/m, respectively. The tensile strength and tear strength increased with OMMT content firstly, reaching its maximum when the OMMT content was 8 wt%. After that, the tensile strength and tear strength decreased with the further increase of the OMMT content. Compared to that of PU, the elongation at break of the PU/OMMT nanocomposites increased, indicating that the stretch of PU/OMMT nanocomposites increased.     

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...     

Characterization of Polyurethane Grafted with Bis(2-hydroxyethyl) Terephthalate

Bis(2-hydroxyethyl) terephthalate (BHETPA) was grafted onto polyurethane (PU) to investigate the effects of BHETPA, which contains a rigid aromatic group and flexible hydroxyethyl groups, on the physical properties of PU. The cross-link density, viscosity, tensile strength, and shape recovery notably increased with an increase of BHETPA due to chemical cross-linking by BHETPA. A PU sample demonstrated excellent low-temperature flexibility compared with plain PU, showing complete recovery at approximately 0°C. Therefore, grafting BHETPA onto PU modified the thermal behavior and greatly improved the tensile stress, shape recovery, and low-temperature flexibility of PU compared to plain PU.     

The effect of the soft segment of polyurethane on copolymer-type polyacetal/polyurethane blends

Mechanical blends of copolymer-type polyacetal (POM) with ester-based and ether-based polyurethane (PU) are immiscible over the 0–50% PU compositional range. The PU elastomer was added to the rigid POM matrix to increase its toughness. The mechanical, physical, thermal, dielectric, and dynamic mechanical properties and morphology of POM/PU blends were investigated. The notched Izod-impact strength of blends reaches a maximum at 10 wt % PU. The tensile strength, Young's modulus, volume resistivity, crystallinity, and density decrease with increasing concentration of PU. The elongation of blends reaches a maximum at 20 wt % PU. The dielectric constant and dissipation factor increase with increasing PU content. From dynamic mechanical measurements, as the elastomer content increases, the height of the damping peak also increases, but there is no transition temperature shift. SEM shows that the blends exhibit a continuous morphology with domain size varying from 1 to 10 μm for PU. However, at a concentration of 50 wt % PU, the dispersed PU particles tend to aggregate. Characterization of morphology by a metallurgical microscope has shown that the crystalline materials in the pure POM and the blends exist in a spherulitic superstructure.     

Effect of polyhydric alcohols on the mechanical and thermal properties,porosities, and air permeabilities of polyurethane-blended films

Polyurethane (PU) and polyhydric alcohols composites were successfully prepared to be used as coating materials for fabrics. The effects of various polyhydric alcohols on the PU composites properties have been investigated. The tensile strengths, glass-transition temperatures, thermal-mechanical properties, and swelling capacities of the PU/polyhydric-alcohol-blended films are described in detail, along with their surface and cross-sectional morphologies. The tensile strengths and glass-transition temperatures of the PU/polyhydric-alcohol-blended films were found to decrease remarkably with increasing polyhydric-alcohol concentration. The swelling capacities and porosities of the PU/poly(propylene glycol) (PPG)-blended and PU/glycerol-blended films were observed to increase with increasing PPG or glycerol concentration. However, the poly(ethylene glycol) (PEG) concentration in the PU/PEG-blended film did not significantly affect its properties. The air and water-vapor permeability of nonwoven nylon fabrics coated with PU/PPG and PU/glycerol increased with increasing PPG or glycerol contents, while those coated with PU/PEG were unaffected by PEG content. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47429.     

Polyurethane-crosslinked epoxy resins. I. Mechanical behavior

Polyurethane (PU) prepolymers based on poly(butylene adipate) (PBA) and poly(oxytetramethylene) (PTMO) polyols were employed as a crosslinking agent to the diglycidyl ether of bisphenol A (DGEBA). Then the DGEBA was cured with a tertiary amine catalyst to form PU-crosslinked DGEBA. The tensile strength of both the PU(PBA)-crosslinked DGEBA and PU(PTMO)-crosslinked DGEBA systems increased to a maximum value with increasing PU content in the system and then decreased with further increasing PU content. Izod impact property of these PU-crosslinked DGEBA indicated that the PU(PBA)-crosslinked DGEBA had much more significant improvement than the PU(PTMO)-crosslinked DGEBA. On the contrary, the fracture energy (G_{1 C} value) of the resultant PU-crosslinked DGEBA showed that the PU(PTMO)-crosslinked DGEBA had much higher G_{1 C} values than the PU(PBA)-crosslinked DGEBA.     

Mechanical and water vapor transport properties of polyurethane/superfine down powder composite membranes

To develop a novel microporous polyurethane (PU) membrane that has higher water vapor transmission rate (WVTR) for use in functional application, down powder with different average particle sizes was blended with PU by using the solution casting method. Scanning electron microscope was used to investigate the changes in the porous structures of PU/superfine down powder (SDP) composite membranes. Attenuated total reflectance Fourier transform infrared spectroscopy curves showed that the addition of SDP decreased the hydrogen bonds of PU matrix. On the basis of wide‐angle X‐ray diffraction curves, the small crystallinity of the PU matrix in PU/SDP composite membranes was lower than that of pure PU membrane. The densities of PU/SDP composite membranes decreased with the increase in SDP content. PU/SDP composite membranes showed a large increase in WVTR and a small decrease in mechanical properties compared to pure PU membrane. Moreover, the WVTR and mechanical properties of PU/down powder composite membranes were found absolutely dependent on the average particle size of down powder. POLYM. ENG. SCI., 2010. © 2010 Society of Plastics Engineers     

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.