离心少注法制造聚氨酯胶辊

主要介绍了采用离心浇注制造聚氨酯胶辊的方法，与其它浇注方法比较，离心浇注法具有成品率高等优点，且适合制造薄胶层胶辊。     

离心浇注法制造聚氨酯胶辊

主要介绍了采用离心浇注制造聚氨酯胶机的方法，与其它浇注方法比较，离心浇注法具有成品率高等优点，且适合制造薄胶层胶辊。     

新型聚氨酯浇注胶

北京中国运载火箭技术研究院航天材料及工艺研究所研制成功电子工业用聚氨酯浇注胶。该产品用于电子产品如洗衣机电路板、数码电子遥控产品、互感器、电容器、电缆、电子元件灌封，及水纯化设计、血液过滤器、人工器官等的密封材料。其对多种基材有良好的粘接性，粘度低，适用浇注；固化温度低，适用期长，无气泡，电绝缘性能高，吸水性低，硬度低，冷热交变不会造成脱粘，防霉，     

电子工业用聚氨酯浇注胶研制

制备了一种邵氏A硬度45-50的蓖麻油基聚氨酯浇注胶。质量份为:蓖麻油19.7份、210聚醚33份、TDI 11.2份、二丁基二月桂酸锡适量。胶粘剂容易除水,2组分有较宽的混合比,可40-50℃混合,室温×24h固化,也可60℃×4 h固化。浇注工艺简单,可手工浇注,也可机器浇注。有良好的物理性能,在电子工业中用于密封。     

美国Amplan浇注机综述

继《美国Amplan挠注机IV型的性能探讨》一文,进一步介绍了美国Amplan公司和其制造的浇注机及其产品特点,并对比说明了聚氨酯浇注胶的特性。     

SiO2填充型聚氨酯IPN绝缘冷浇注树脂的研究

冷浇注型绝缘树脂是通讯电缆、输变电力电缆附件的重要组成材料之一。由三羟甲基丙烷、蓖麻油、活性烯类单体等构成树酯基材，填充ＳｉＯ２等无机填料。固化后，形成绝缘聚合物互穿网络。将这种材料按双组份配蚵以长期贮存，混合后可在室温下浇注，并可在１２～２４小时内完全固化。固化后材料具有良好的电绝缘性能和物理机械性能，可作为冷浇注型电缆附件材料使用。     

浇注型聚氨酯弹性体的研制

采用一步法工艺制备了两种浇注型聚氨酯弹性体体系,对胶液的性能及固化后胶层的性能分别进行了测试分析,并与预聚法得到的胶层的性能进行了比较,认为该法制备的浇注型聚氨酯弹性具有优异的综合性能和广阔的应用前景。     

聚氨酯浇注轮胎的开发和研究进展

聚氨酯浇注轮胎的开发和研究进展郝立新，刘锦春，刘保成（青岛化工学院２６６０４２）１聚氨酯浇注轮胎的发展历史聚氨酯浇注轮胎是伴随着聚氨酯材料的出现、发展应运而生的一种新型轮胎，是由液态聚氨酯浇注或注射到轮胎模具中固化反应制成的。用聚氨酯弹性体制作轮胎的...     

浇注型聚氨酯弹性体动态生热性研究

本文研究了预聚物－ＮＣＯ含量，多元醇并用比，扩链剂种类和用量，预聚物制备方法对羟丁型，聚酯型浇注聚氨酯弹性体动态生热性的影响。     

高性能浇注型聚氨酯弹性体的动态性能研究

通过高性能浇注型聚氨酯弹性体的合成，研究了二异氰酸酯结构、多元醇结构对浇注型聚氨酯弹性体动态性能的影响，结果表明，异氰酸酯基团含量增加，聚氨酯弹性体的硬度、撕裂强度和耐热性提高。     

不同结构水性聚氨酯分散体的合成与性能研究

用不同结构不同分子质量的聚酯多元醇合成一系列水性聚氨酯分散体,探讨了其力学性能、黏度、粘附力和贮存稳定性,还分析了结晶性、扩链剂和硬段含量对水性聚氨酯性能的影响.结果表明,用PBA和PHA合成的水性聚氨酯具有较好的性能,适度的结晶性有利于提高粘附力,扩链交联剂在一定的比例范围才能保持分散液的稳定性,40%～46%硬段含量可以保证水性聚氨酯既有较好的力学性能和黏度,又有满足使用要求的干燥速度.     

Coatings prepared from waterborne polyurethane dispersions obtained with polycarbonates of 1,6-hexanediol of different molecular weights

Waterborne polyurethane dispersions (PUDs) were synthesized with polycarbonates of 1,6-hexanediol of different molecular weight (500–3000 Da) and their properties, adhesion (Hatch adhesion) and coatings on stainless steel properties (Pencil hardness, Persoz hardness, gloss at 60°, chemical resistance, yellowness index) were characterized. The hatch adhesion of the polyurethane coatings to stainless steel was very good and decreased slightly by increasing the molecular weight of the polycarbonate of 1,6-hexanediol. Both the Pencil and Persoz hardness values of the coatings increased by increasing the hard segments content in the polyurethane, i.e. by decreasing the molecular weight of the polycarbonate of 1,6-hexanediol, whereas the gloss and the yellowness index were lower for the coatings obtained with the polycarbonate of 1,6-hexanediol of molecular weight of 500 Da. Very good chemical resistance against ethanol for all polyurethane coatings on stainless steel plates was obtained but for long time of ethanol in contact with the coating surface the chemical resistance decreased, more markedly for the polyurethane coating obtained with the polycarbonate of 1,6-hexanediol of higher molecular weight. In summary, the segmented structure of the waterborne polyurethane dispersion determined the properties of the polyurethane coatings obtained from them.     

聚氨酯/醋酸洗必泰-蒙脱土复合抗菌材料的制备与研究

在聚氨酯(PU)中加入一定量的醋酸洗必泰-蒙脱土(CA-MMT)纳米抗菌剂,制备剥离弥散型的PU/CA-MMT抗菌材料。通过热重分析(TG)、原子力显微镜(AFM)、扫描电镜(SEM)、细菌粘附、贴膜抗菌实验等进行表征和测试抗菌性能。细菌粘附实验结果表明,相比于CA,MMT的加入使CA-MMT耐高温性能明显提高,能适应高温的加工条件,同时由于CA-MMT在材料中被剥离,易于释放出来,因此PU/CA-MMT的抗菌效果更优异。贴膜抗菌实验结果表明,未加CA的菌落数太多,无法计数;而含CA的,有明显的抗菌性,且PU/CA-MMT材料使PU基体具有良好抗菌性能,同时抗菌性能比PU/CA更优异。     

全水发泡硬质聚氨酯泡沫塑料的研制

研制了低粘度的聚醚PE600系列和具有良好流动性的全水发泡硬质聚氨酯泡沫塑料组合聚醚。对制备中影响发泡性能的有关因素进行了探讨。依此制备的硬质聚氨酯泡沫塑料具有良好的尺寸稳定性、优异的粘接性能和较低的导热系数，已达到或超过汽车、建筑行业对全氟泡沫的要求，具有广阔的市场前景。     

The influence of ageing of epoxy coatings on adhesion of polyurethane topcoats and protective properties of coating systems

The dependence of adhesion and protective properties of coating systems on surface properties of epoxy intermediate coatings, aged and non-aged before an application of polyurethane topcoats, were examined. The intermediate coatings were aged 500 h in UV chamber. The surface free energy and polar groups were estimated after ageing. After applying polyurethane topcoats on aged and non-aged epoxy coatings, resistance to salt spray and thermal shocks were tested as well as internal stresses were measured before and after corrosion tests.The results showed that adhesion in coating systems with polyurethane topcoats applied on aged epoxy coatings depends strongly on the degradation degree of epoxy intermediate coatings and the value of generated internal stresses. Coatings with good adhesion retention in corrosion environments have good protective properties even when temporary blistering has occurred.     

OPP膜用聚氨酯复合粘合剂的研究

采用丙酮法制备水性聚氨酯树脂,再复配聚醋酸乙烯酯乳液和松香乳液,提高了水性聚氨酯树脂粘合剂与0PP膜的粘合性。研究了粘合剂组成、烘干时间对0PP膜粘合性的影响,最后进行了优化正交实验。优化结果表明,当聚氨酯与聚醋酸乙烯酯乳液、松香乳液的配比（质量比）为11：9：3,干燥温度60℃,干燥时间为60s时,聚氨酯复合胶粘剂的力学性能较好,其抗拉强度为12．1N·mm^-2以。     

Studies of acoustical absorption of flexible polyurethane foam

It was confirmed that one of the principal factors which influences the acoustical absorption of flexible polyurethane foam is flow resistance of foam. Normal polyester-based flexible polyurethane foam itself has an adequate value of flow resistance and shows fairly good sound absorption. Acoustical absorption of normal polyether-based flexible polyurethane foam, which generally has lower flow resistance, can be improved by using some expedients such as setting up a certain skin layer on the foam surface so that the flow resistance of the foam can be increased. Surface treatment of foam such as gluing film, heat melting, spraying, or heat adhesion with film can not only improve sound absorption and mechanical properties of polyether-based flexible polyurethane foam, but also improve the hydrolysis resistance of polyester-based flexible polyurethane foam. Inserting some metal foil or plastic film between flexible polyurethane foams can change the sound absorption behavior according to the position of the foil or the film in the foam. The effects of foam thickness, existence of air layer behind foam, and foam profiling on acoustic absorption were also investigated.     

Characterization of Thermoplastic Polyurethanes Prepared Using Different Macroglycols

Three polyurethane elastomers (PU_s) were prepared using macroglycols of different nature (varepsilon-polycaprolactone, polyadipate of 1,6-hexanediol) and length of the hydrocarbon chain (polyadipate of 1,4-butanediol, polyadipate of 1,6-hexanediol). The PU_s were characterized using Gel Permeation Chromatography, Differential Scanning Calorimetry, Wide X-ray angle Diffraction, Dynamic Thermal Mechanical Analysis, stress-controlled rheometry and stress-strain experiments. The surface properties were evaluated from contact angle measurements. The PU_s were used as raw materials for solvent-based adhesives, whose adhesion properties were measured from T-peel strength of plasticized poly(vinyl chloride) (PVC)/polyurethane adhesive joints. The use of polyadipate of 1,6-hexanediol produced a polyurethane with high crystallinity (i.e. poor rheological and mechanical properties) and enhanced interactions between soft segments. Low adhesion was obtained in joints produced with this polyurethane and a cohesive failure of the adhesive was produced. The decrease in the polyadipate hydrocarbon chain length decreased the degree of crystallinity between polymer chains, therefore, no reduction in rheological and mechanical properties was obtained; a higher joint strength was also obtained. In this study the best performance was obtained with the polyurethane based on varepsilon-polycaprolactone, presumably because of its higher surface energy and reduced crystallinity. The properties of the polyurethanes prepared in this study were more affected by the characteristics of the macroglycol, and the crystallinity of the polyurethane had a more marked effect on the properties than the degree of phase separation.     

玻璃表面用纳米ATO透明涂层的隔热性能研究

以双组分水性聚氨酯为成膜剂,加入纳米氧化锡锑（ATO）,以蒸馏水为溶剂,制备了纳米ATO双组分水性聚氨酯隔热透明涂料。将制得的涂料涂覆在玻璃上,测试在可见光区和红外光区的透过率以及对隔热性能的影响,比较了不同固化工艺对涂层力学性能的影响。结果表明：制得的纳米ATO透明隔热涂膜对玻璃附着力好,温差可达7．3℃,可见光透过率达85％上,具有良好的隔热效果和足够的可见光区透明度,节能效果显著。     

Melt mixing of carbon fibers and carbon nanotubes incorporated polyurethanes

Polyurethane composites filled with carbon fibers (CF) and carbon nanotubes (CNT) were prepared by mixing and injection molding, and its mechanical as well as their thermal properties were investigated. Dynamic mechanical analysis (DMA), thermogravimetry analysis (TGA), and thermal conductivity tests were done, and the properties were evaluated as a function of the filler concentration. The storage modulus of the composites increased with fillers concentration, which also mean the increase of the stiffness, suggest a good adhesion between the polyurethane matrix and the fillers. Addition of more CF and CNT to the composites broadened and lowered the peak of tan δ specifies that the polyurethane composite became more elastic because there is a good adhesion between the fillers and the matrix. The addition of carbon fillers improves the thermal stability of the polyurethane. The inclusions of CNT show a better thermal stability when compared with CF. The addition of carbon fillers also increased the thermal conductivity of the polyurethane composites. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008