水性聚氨酯木器漆中消泡剂的选用

水性聚氨酯木器漆极易产生气泡,影响其装饰性。通过系列试验,筛选出适宜的消泡剂,并确定其最佳用量。     

单组分阴离子水性聚氨酯胶膜的热质研究

应用热质分析（TG）研究了单组分阴离子水性聚氨酯胶膜的耐热性能，结果表明：n（--NCO）：n（--OH）增大，胶膜的耐热性能增强；聚酯相对分子质量增加，耐高温性能降低；用DEG扩链时的耐高温性能比用DEG／TMP时的好；TDI型水性聚氨酯成膜物的耐高温性能优于IPDI型水性聚氨酯。     

封闭型异氰酸酯胶粘剂的研制

以聚乙二醇（PEG）、甲苯-2,4-二异氰酸酯（TDI）等为原料制得阳离子水性聚氨酯,异氰酸酯用丁二酮肟进行封闭制备封闭型异氰酸酯胶粘剂,探讨了阳离子水性聚氨酯溶液的固含量、TDI的封闭,解封以及封闭型异氰酸酯的用量对产品性能的影响.结果表明：30%的阳离子水性聚氨酯溶液加入溶液质量15%左右的封闭型异氰酸酯的胶粘剂对金属的粘接效果较好.     

Tailoring HASE rheology through polymer design: Effects of hydrophobe size, acid content, and molecular weight

Hydrophobically modified alkali-soluble emulsion (HASE) polymers are an important class of rheology modifiers for waterborne coatings applications. They are typically prepared as terpolymers by emulsion polymerization of ethyl acrylate (EA), methacrylic acid (MAA), and an associative macromonomer. The viscosity development and shear responses of HASE solutions depend on a number of factors. This article presents rheological data reflecting the impacts of three key variables: hydrophobe size, acid content, and molecular weight, on model HASE thickening and rheological performance. The relative contributions of hydrophobic association, chain expansion, and polymer chain length are discussed. In steady shear flow, all thickener solutions approached some constant low-shear viscosity at small deformation rates. At the same molar composition, larger hydrophobe size resulted in higher viscosity development and greater shear thinning behavior. The amount of acid monomer in HASE polymers can influence the balance between hydrophobic attraction and electrostatic repulsion forces. It was found that a minimum of 15 wt% MAA was required to effect dissolution and thickening of the model HASE polymers. Increasing the MAA level yielded higher zero-shear viscosity and storage modulus G’ with maximal values being obtained at 40% MAA. The molecular weight of the model thickeners was controlled by the amount of chain transfer agent (CTA) added during polymerization. When the CTA level was below 0.1 wt% based on total monomers, the polymer solutions displayed shear-thinning behavior. A small increase in CTA concentration beyond 0.1% resulted in a dramatic change to Newtonian flow, and the solution viscosity was nearly two orders of magnitude lower. The model thickeners were also tested in a vinyl acrylic architectural paint formulation. The effects of each individual factor on paint thickener efficiency, high-shear, and low-shear properties are discussed and compared with solution rheology for predictive relationships. Presented at the 81st Annual Meeting of the Federation of Societies for Coatings Technology, November 11–12, 2003, in Philadelphia, PA.     

交联剂对双组分水性氟涂料的影响

从反应速度、适用时间等方面研究了几种交联剂对水性双组分氟涂料漆膜性能的影响。     

水性涂料分散剂PD的生产

本文介绍了水性涂料分散剂大分子萘磺酸甲醛缩合物的钠盐(PD)的生产工艺流程，并与国外同类产品的性能技术指标进行了对比，结果表明：该产品完全可以作为国外同类产品的替代品，具有较高的使用和推广价值。     

Effects of ion group content and polyol molecular weight on physical properties of HTPB‐based waterborne poly(urethane‐urea)s

A series of waterborne poly(urethane‐urea)s, WPUUs, based on using nonpolar hydroxyl‐terminated polybutadiene (HTPB) as the soft segment, were successfully synthesized in this article. The effects of the COOH group content and soft‐segment molecular weight (Mn_s) on the dispersion, morphology, and physical properties were investigated. Variations of the particle size, viscosity, and zeta potential were first governed by the hydrophilicity of the polymer chain, and then by the swelling derived from water. Fourier transfer infrared spectroscopy (FTIR) and differential scanning calorimetry (DSC) indicated that the degree of phase separation decreased as the COOH group content increased or as Mn_s decreased. However, the hydrogen bonding between the soft and hard segments and the two‐phase mixing could not occur in this nonpolar HTPB‐based WPUU system, indicating that the hard segments tended to form smaller domains and to pack more loosely. It was attributed to the fact that the presence of bulky ionic salt groups destroyed the ordered arrangement of the hard segments. In this case, the increases of the interface area between the soft and hard phases resulted in that the present behaviors were similar to the phase mixing. In tensile properties, HTPB‐based WPUUs exhibited higher tensile stress, elongation at break, and modulus as the COOH group content decreased or as Mn_s decreased. In thermal degradation, the introduction of HTPB polyol improved the thermal stability of WPUU. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007     

支化型水性聚氨酯胶黏剂的合成及性能

采用异佛尔酮二异氰酸酯(IPDI)、聚四氢呋喃醚二醇2000(PTMG2000)为原料,二月桂酸二丁基锡、1,4-丁二醇和2,2-二羟甲基丙酸分别为催化剂、小分子扩链剂和亲水单体,制得水性聚氨酯预聚体(PPU);接着以丙烯酸甲酯、二乙醇胺和三羟甲基丙烷为原料合成了超支化聚(胺-酯)(HPAE);最后制备出不同HPAE含量(以IPDI与PTMG2000的总质量为基准,下同)的支化型水性聚氨酯(WPU)胶黏剂.采用FTIR和1HNMR对HPAE及胶黏剂的结构进行了表征;通过TGA、多功能材料试验机考察了胶膜的热力学性能和机械性能.结果表明,HPAE用量为IPDI与PTMG2000的总质量的1.0％时,制备的WPU2乳液及胶膜综合性能较好,其乳液固含量为33.67％,胶膜吸水率为11.22％,水接触角为90.32°;胶膜机械拉伸强度为10.33 MPa,断裂伸长率为533.73％;其粘结性能良好,剥离强度为4.063 N/mm.     

锌基水系复合涂层——达克罗表面处理技术

介绍了锌基水系复合涂层——达克罗表面处理技术的抗蚀机理和优异性能。     

水性聚氨酯固色剂的性能和合成

水性聚氨酯作为固色剂应用的综述。讨论了水性聚氨酯固色剂的性能特征、合成原理和方法。分析指出水性聚氨酯技术的发展(与天然高分子相结合),将生产出可生物降解的、无金属盐的、较少有机化合物公害的、对环境友好的材料。