双重交联型聚氨酯涂料

在作者提出的“多重成膜机制概念”的基础上,研制了一种通过NCO/OH交联与双键氧化交联两种机制固化的聚氨酯涂料;探讨了该涂料的固化机制、配方设计与性能特点,对其经济性与应用前景进行了评价.     

双重交联型聚氨酯涂料

在作者提出的“多重成膜机制概念”的基础上，研制了一种通过ＮＣＯ／ＯＨ交联与双键氧化交联两种机制固化的聚氨酯涂料，探讨了该涂料的固化机制，配方设计与性能特点，对其经济性与应用前景进行了评价。     

国内期刊荟萃

聚氨酯涂料多重成膜机制的思考与实践；铝型材用电泳涂料的研制；高分散性纳米氧化锆晶粒在涂料中的应用；水性聚氨酯的合成及固化涂层性能；可UV固化的辣椒碱型杂萘联苯环氧丙烯酸酯防污涂料；紫外光固化腰果酚／二氧化硅复合涂料的性能；铝型材粉末静电喷涂生产工艺条件优化；     

UV固化涂料

UV固化反应属于能量引发聚合反应,在光引发剂存在下,成膜物经自由基反应几秒钟可形成交联固化涂膜.UV固化涂料可分为水性UV 固化涂料、UV固化粉末涂料和溶剂型UV固化涂料.本文重点介绍UV固化涂料的固化体系,UV固化粉末涂料、水性UV固化材料和溶剂型UV固化涂料.     

环氧树脂涂料配方设计

讨论了环氧树脂交联固化成膜的结构参数与性能的关系，概述了环氧树脂涂料配方设计的要点。     

UV涂料在家具行业的应用介绍

UV涂料是Ultraviolet Curing Paint的英文缩写。即光引发涂料,也称光固化涂料。与PU、PE、NC等涂料以成膜物质命名方式不同,UV涂料是以涂料的固化方式命名的。自2002年初以来,在全国家具企业集中的地区,使用UV涂料的厂家越来越多。     

醇类在氨基涂料固化过程中的附加交联作用

一、前言以前,我们提出了“附加交联作用”这一概念,研究了三环癸烯基在丙烯酸氨基涂料成膜时的附加交联作用。本文将研究醇类在各种氨基涂料固化过程中的附加交联作用。所研究的醇类包括分子量62～1000的一元醇、多元醇和多羟基齐聚物(分子量在常用溶剂与常规树脂之间)。研究了十几种醇类与齐聚物加入醇酸-丁氧基化三聚氰胺甲醛树脂、丙烯酸共聚物-丁氧基化三聚氰胺甲醛树脂、丙烯酸共聚物-六甲氧甲基三聚氰胺树脂、聚酯树脂-六甲氧甲基三聚氰胺树脂等体系中时,在烘烤固化过程中的附加交联作用。测定了它们参与成膜的转化率,讨论了醇类的分子量、结构、试验条件等因素对转化率的影响,以及丁氧基化三聚氰胺     

UV涂料在家具行业的应用

UV涂料是U1traviolet Curing Paint的英文缩写。即光引发涂料，也称光固化涂料。与PU、PE、NC等涂料以成膜物质命名方式不同，UV涂料是以涂料的固化方式命名的。自2002年初以来，在全国家具企业集中的地区，使用UV料的厂家越来越多。     

乳化型水性固化剂的固化行为与成膜机理探讨

乳化型水性固化剂在成膜过程中兼具乳化与固化功能,直接影响了水性涂料的固化成膜和涂层性能。比较了水性环氧树脂涂料与溶剂型环氧树脂涂料的成膜过程,探讨了双组分水性环氧树脂涂料的成膜机理,分析了影响水性环氧树脂涂料成膜的因素;环氧乳液的粒径、固化剂与环氧树脂的相容性以及水从环氧乳液中的挥发速率等都会影响水性环氧树脂涂料的成膜过程,进而影响涂膜的物理化学性能。     

聚氨酯树酯及其涂料

用于低硬度不发泡聚氨酯凝胶涂料组合物的双组分聚氨酯树脂制备方法,多重交联紫外光固化水性聚氨酯涂料,纳米颗粒改性的多异氰酸酯,水性环氧含硅聚氨酯防腐涂料的研制,水性紫外光固化聚氨酯丙烯酸酯的干燥与固化过程     

湿度对水性双组分木器涂料的影响

通过测试并描述环保型水性双组分聚氨酯涂料成膜机理及成膜过程的表面状况,介绍了在不同环境湿度下,水性双组分木器清漆所表现出来的各方面性能及表观的变化,从而阐述了湿度对水性双组分聚氨酯木器涂料施工及涂膜性能的重要性。     

水性双组分聚氨酯外墙罩光清漆的研制

水性双组分聚氨酯涂料兼有溶剂型双组分聚氨酯涂料的高性能和水性涂料的低VOC（挥发性有机化合物）特点,成为当前涂料研究的热点和发展方向。以核壳结构的羟基丙烯酸乳液为主要成膜物质,以水性异氰酸酯为固化剂,制得水性双组分聚氨酯外墙罩光清漆,所得涂膜性能优异且VOC含量极低。     

高性能水性双组分聚氨酯工业面漆的研制

使用自制的羟基丙烯酸乳液制得了水性双组分聚氨酯工业面漆。重点考察了水性双组分聚氨酯工业面漆研制过程中颜基比及成膜温度对涂膜耐介质性能的影响、催化剂用量和温度对涂料凝胶时间的影响,并对n(—NCO)/n(—OH)和流挂性能进行了探讨,最终得到了各项性能指标均优异的水性双组分聚氨酯工业面漆。     

交联剂在室温固化双组分水性涂料中的应用

用多异氰酸酯型、氮丙啶型和环氧基型三种室温固化交联剂分别固化丙烯酸聚氨酯分散体水性涂料,测定并比较了交联涂膜的性能。结果发现,环氧型交联剂固化的产物综合性能最好,主要表现在涂膜硬度、附着力、耐水性、耐溶剂性、耐污渍性和耐烫性上比未交联涂料和其他两种交联剂固化的涂料要好得多。此外,配漆后的适用期很长,施工方便程度类似于单组分涂料。     

Effects of nitrolignin on mechanical properties of polyurethane–nitrolignin films

Polyurethane‐nitrolignin (PUNL), a new network polymer, was synthesized from a castor oil based–polyurethane (PU) prepolymer and nitrolignin (NL) with a weight‐average molecular weight of 20.6 × 10⁴ and a content of 1.4–10%. The structure and miscibility of PUNL films prepared by solution casting were investigated by infrared spectroscopy and transmission electron microscopy. The results indicated that PUNL2 film, which had a 2.8% NL content, was the most miscible, and its tensile strength (σ_b) and breaking elongation (?_b) were 2 times higher than that of PU film. The crosslink densities of PUNL films increased with the increase of NL content until about 3%, similar to the variety of the mechanical properties. Thermogravimetric analysis revealed that the thermal stability of PUNL films was slightly higher than that of PU. Covalent bonds occurred between PU prepolymer and the NL in the PUNL films, forming crosslink networks, which resulted in the enhancement of mechanical properties and thermal stability. NL has a far higher reactivity with PU than nitrocellulose. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 80: 1213–1219, 2001     

乐器涂料施工新工艺探讨

试验通过将PU涂料与PE涂料按照不同的施工工艺进行施工比较,研究不同施工工艺对最终涂膜性能的影响。试验中发现:在配方相同的条件下,当PU涂料与PE涂料单独进行施工时,容易出现气泡、痱子等弊病;而当把PU涂料与PE涂料混合后再进行施工时,结果涂膜表面丰满,平整光滑,不易出现弊病。后者在确保了涂膜性能的同时还缩短了涂膜施工的时间。     

Investigation of accelerated aging behaviour of high performance industrial coatings by dynamic mechanical analysis

Dynamic mechanical analysis (DMA) represents one of the most important methods for understanding mechanical behaviour of surface coatings providing a valuable link between chemistry, morphology, and performance properties. In this work, dynamic mechanical properties of several high performance industrial coatings were studied extensively. Four commercially available topcoats namely alkyd modified polyurethane (PU), economy aliphatic PU, high performance aliphatic PU and epoxy modified polysiloxane were selected based on their cure chemistries, volume solids, and overall performance. DMA was used to determine elastic modulus, glass transition temperature (T_g), crosslink density and creep behaviour of these coatings. DMA data were substantiated with mechanical and performance properties. Among the coatings, epoxy modified polysiloxane showed the highest T_g of 65.6 °C as well as crosslink density value of 2.24 × 10⁻³ mol/cc which was attributed to its superior mechanical and performance properties. In addition, topcoats were also subjected to artificial aging process in accelerated cyclic corrosion cabinet and QUV-weatherometer, respectively. The consequent changes in their physico-mechanical properties post exposure were also evaluated using DMA and correlated with other performance properties. After aging, the T_g increased substantially for all the coatings irrespective of their exposure type. For example, T_g of economy aliphatic PU increases from 38.4 °C to 52.9 °C and 51 °C after cyclic corrosion and UV-B weathering, respectively. However, crosslink densities either increased or decreased depending on the type of exposure and cure chemistries. These changes were corroborated using the Fourier transform infrared spectroscopy findings. The outcome of this study is expected to generate new insights into the behaviour of these coatings under dynamic mechanical stress and its relation with long term performance properties.     

溶剂型MDI双组分聚氨酯涂料的活化期及影响因素探讨

对比在溶剂型MDI双组分聚氨酯涂料施工中,体系黏度上升对涂膜性能的影响,并据此提出溶剂型MDI双组分聚氨酯涂料的活化期的测试方法。对实际应用中影响溶剂型MDI双组分聚氨酯涂料活化期的主要因素作了一些总结及研究分析。     

高性能水性聚氨酯涂料的研制

针对水性聚氨酯涂料普遍存在耐水、耐溶剂性能差、固化涂膜硬度低等缺点,通过在水性聚氨酯涂料的制备过程中引入半干性油、单体及乙烯基三乙氧基硅烷改善其性能。在半干性油的氧化交联与乙烯基三乙氧基硅烷自交联的共同作用下,涂膜的交联密度变大,性能明显提升。     

聚氨酯涂层在3.5%氯化钠溶液浸泡作用下的失效机理

采用电化学交流阻抗谱研究了聚氨酯涂层在3.5%氯化钠溶液浸泡作用下的性能变化,用FTIR对涂层失效前后的组成进行了分析,用SEM研究了涂层表面形貌变化,用能谱研究了腐蚀产物的成分,对聚氨酯涂层在腐蚀环境中的失效机理进行研究和分析。