气相法纳米粉体对聚酯粉末涂料性能的影响

[目的]气相法制备的纳米粉体可作为粉末涂料的分散助剂。[方法]研究了气相二氧化硅和气相氧化铝对聚酯粉末涂料的流动性、上粉率、储存稳定性,以及涂层硬度、附着力、光泽等性能的影响。[结果]添加0.1%～0.3%(质量分数)疏水改性的气相二氧化硅对粉末涂料的流动性和储存稳定性有显著的提升,对上粉率及涂层硬度、附着力有略微的提升,但对涂层有一定的消光作用;添加0.1%～0.2%(质量分数)气相氧化铝对粉末涂料上粉率有显著的提升,对流动性、储存稳定性及涂层硬度、附着力也有略微的提升,但对涂层的光泽影响较小。[结论]在粉末涂料中疏水型气相二氧化硅和气相氧化铝搭配使用,可获得更优的性能。     

HAA体系低温固化干混消光粉末涂料用低酸值聚酯树脂的合成及性能研究

通过考察聚酯配方中的二元醇单体的作用,研究酸解剂对涂层性能的影响,并在聚酯中加入特殊搭配的光稳定剂,合成得到了适用于制备羟烷基酰胺（ HAA）体系低温固化干混消光粉末涂料的低酸值聚酯树脂,同时研究了粉末涂料的固化反应。结果表明：该粉末涂料具有较低的活化能,制备涂层可以实现 160 ℃低温固化,消光光泽约为 28,涂层具有良好的耐冲击性和耐老化性能,综合性能优异。     

粉末涂料

基于带有羧基、羟基或胺官能团热固性无定形聚酰胺的粉末涂料组合物;形成耐沾污涂层的粉末涂料组合物;耐候性和机械性能好的半光粉末涂料组合物;带有粉末涂层的三层振动阻尼钢管的制备;粉末涂料组合物,中等光泽范围涂层,相关方法和基材.     

2,6-萘二甲酸在粉末涂料用聚酯树脂中的应用研究

用2,6-萘二甲酸(HNDA)部分替代对苯二甲酸(PTA)合成了聚酯树脂,并以其制备了粉末涂料。通过差示扫描量热仪、热失重仪和人工加速老化实验对聚酯树脂及粉末涂料的性能进行了研究,对比了PTA/HNDA配比对聚酯酯化时间、聚酯树脂玻璃化转变温度(Tg)、聚酯树脂的热稳定性及粉末涂层光泽、耐热性能及耐老化性能的影响,发现以HNDA替换PTA有利于提高聚酯树脂的Tg、热稳定性,粉末涂层的光泽、耐热性及耐水煮性能,但降低了聚酯树脂的酯化效率和涂层的耐老化性能。     

粉末涂料用含硅聚酯树脂的合成及性能研究

通过采用二取代有机硅氧烷、二取代硅油和二氯硅烷等含硅单体,制备了粉末涂料用含硅聚酯树脂,并研究了含硅树脂及其粉末涂料的性能。结果表明：有机硅的引入会造成涂层光泽升高、机械性能和流平性下降,涂层的耐热性显著增加,在黏度相差不大的前提下,涂层的耐候性显著降低。硅原子会通过重排的形式在涂层表面富集,增加涂层的静态水接触角,显著提高涂层的疏水性。     

市场趋向

正超细粉末涂料市场前景广阔粉末涂料是环保型涂料,发展空间大。但普通粉末涂料的缺点是涂层厚度太厚(通常在60~100μm,大大超过传统液体涂料的厚度)、平整度差、光泽低、粉末喷涂量多等。普通粉末涂料的上述缺点限制了其推广应用。上述缺点可以通过降低粉末颗粒粒径的方法来解决。普通粉末涂料颗粒粒径一般为30~40μm,粒径小于30μm为细粉末涂料,粒径为10~20μm为超细粉末涂料。超细粉末涂料的涂层薄(30~40μm,接近液体涂料的水平)、平整度好、光泽高、粉末     

新型聚酯/环氧粉末涂料

通常含羧基聚酯/异氰脲酸三缩水甘油酯粉末涂料的光泽、流平性、透明度、机械性能、粉末稳定性不太理想。美国专利4471108报道的新型含羧基聚酯/异氰脲酸三缩水甘油酯粉末涂料的粉末稳定性好,其涂层的光泽、流平性、透明度、机械性能等综合性能优异。其中该聚酯     

聚氨酯粉末涂料概论

简单介绍了聚氨酯粉末涂料的国内外发展状况,聚氨酯粉末涂料的组成及特点,重点阐述了聚氨酯粉末涂料的品种和制备,综述了影响聚氨酯粉末涂料性能的因素,最后对这种新型材料作了展望。     

粉末涂料技术新进展Ⅱ

６特殊粉末涂料的发展［１８～１９］目前粉末涂料可以制得各种范围光泽、金属闪光效果、锤纹效果、立体花纹效果、多色效果等特殊效果的品种。粉末涂料的光泽变化是靠固化期间引起不规则微结构的涂层表面来获得的,业已开发了许多方法来产生不规则的表面,由此形成的光散...     

户外用羟烷基酰胺固化干混消光粉末涂料用聚酯树脂的合成与应用

开发了适用于羟烷基酰胺(Primid)固化干混消光粉末涂料用的高、低酸值聚酯树脂。研究了高、低酸值聚酯树脂制备成粉末涂料之后烘烤形成的涂层和按质量比50:50干混后烘烤形成的涂层的机械性能、耐水煮性和耐热性。结果表明:该Primid固化体系干混光泽可以达到25~35,表面流平性和细腻度佳,机械性能和耐水煮性能优异,可以部分替换异氰脲酸三缩水甘油酯(TGIC)固化型粉末涂料。     

锌粉和有机硅对聚氨酯涂层耐蚀性和热性能的影响

通过浸泡腐蚀和高温烘烤,以涂层的冲击强度为依据,研究了不同锌粉含量的聚氨酯涂层在10%(质量分数,下同)HCl、10%NaOH和20%NaCl溶液中的耐腐蚀性以及不同有机硅添加量的涂层在120℃下的耐热性.通过热重分析(TG-DSC),比较了改性前后聚氨酯涂料的热稳定性,测试了涂层的综合性能.结果表明,含锌量为83%的...     

Al/ZnS涂层织物的红外发射性能

以片状Al粉为金属颜料,加入ZnS、Na2SiO4、羧甲基纤维素钠和不同粘合剂制备低红外发射率涂料。将涂料涂覆在铝板上,比较含4种不同粘合剂涂层的发射率,研究粘合剂对涂层红外发射率的影响。将涂料涂覆在织物上,测量涂层的表观形态,分析工艺处方、织物种类等因素对织物涂层发射率的影响。油性聚氨酯粘合剂涂层的发射率最低,随着Al和ZnS含量的增加,织物涂层发射率逐渐降低,且不同织物基质上的涂层红外发射率不同。当使用油性聚氨酯为粘合剂,铝粉质量分数为35%～40%,ZnS质量分数为2%时,涤纶织物涂层发射率为0.69。     

聚氨酯粉末涂料在摩托车发动机箱体涂装中的应用

概述了非溶剂型涂料发展趋势及聚氨酯粉末涂料的组成、固化原理、物化性能和主要技术指标。介绍了聚氨酯粉末涂料在摩托车发动机铝合金箱体涂装中的应用及涂装工艺。     

Surface properties of polyurethane powder lacquers modified with polysiloxane‐methacrylic core‐shell nanoparticles

Non‐ and core‐shell nanoparticles‐containing polyurethane‐based powder coating systems, crosslinked with allophanate bonds containing polyisocyanates were examined. The surface structure of the powder coatings were investigated with a confocal microscopy and polarized optical microscopy (POM) using reflected light. The three‐dimensional surface topography and the values of surface roughness were determined. The surface structure was correlated with the chemical structure of the coatings and macroscopic surface behavior: surface free energy and gloss. These experimental results led to a better understanding of the development of surface topography and morphology and provide valuable information for the development of new polyurethane powder coating systems. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2011     

非焦油型双组分聚氨酯防水涂料的研制

通过一定比例合成含有NCO的聚氨酯预聚体为A组分,将粉料、聚醚、MOCA、助剂等制成B组分,将A、B组分按质量比1∶2混合成膜制得非焦油型双组分聚氨酯涂料。探讨了NCO含量、MOCA、催化助剂、消泡剂对双组分聚氨酯涂料的影响,结果表明:NCO含量在4.0%~4.6%、MOCA含量在2.5%~4.0%、催化剂在0.08%~0.12%、消泡剂在0.3%~0.7%,可以制得性能优异的双组分聚氨酯涂料。     

环氧树脂-有机硅复合改性水性聚氨酯耐温防腐涂料的研究

以异氟尔酮二异氰酸酯(IPDI),聚丙二醇(PPG),二甲基硅油及环氧树脂等为主要原料合成了环氧树脂-有机硅复合改性水性聚氨酯,通过添加无机填料和助剂制备了水性聚氨酯涂料。利用红外光谱和热分析仪对乳液、涂料的结构和性能进行表征。探讨了乳液、镇水粉和铁红的用量对涂膜力学性能、耐水性能和防腐性能的影响。当乳液含量为65%,镇水粉含量为10%,铁粉含量为6%时,其热稳定性能提高了50℃,吸水率降低了3倍,冲击强度增加到80 kg/cm,附着力达到0级,自腐蚀电位提高至450 mV。结果表明,无机填料的加入,可极大改善水性聚氨酯涂层的综合性能。     

Accelerated weathering and chemical resistance of polyurethane powder coatings

A study of the weathering mechanism of innovative polyurethane powder coatings has been performed. UV-B irradiation and condensation cycle accelerated tests were carried out on two different polyurethane powder coating formulations for outdoor applications. Using Fourier transform infrared spectroscopy and microscope observation, it was possible to analyze the photochemical and morphological modifications. In addition, the color and gloss changes were measured. Organic coatings are often in contact with solvents in particular during cleaning actions. The chemical resistance was then studied considering the evolution of the corrosion barrier property of the coating as a function of the solvent contact time. Electrochemical impedance spectroscopy measurements were carried out. Methylethylketone (polar) and xylene (apolar) were considered as representative solvents. Due to the strong polarity, the first solvent showed a strong interaction with the hydrogen bonds between the polyurethane chains causing the solvent uptake. The amount of solvent uptake depends on the coating chains rigidity caused by the different polyester resin monomers. The apolar xylene presented no significant interaction with the coatings.     

水性聚氨酯的蓖麻油和环氧改性及其富锌涂层耐蚀性能研究

以蓖麻油和环氧树脂为改性剂,对水性聚氨酯进行了改性,乳液红外分析证实了改性剂的有效接枝.改性后的聚氨酯其耐水性得到明显提高,吸水率降至3%以下.通过扫描电镜(SEM)、腐蚀电位和电化学阻抗谱(EIS)等方法对改性聚氨酯的富锌涂层进行了表征.结果表明,改性水性聚氨酯言锌涂料具有良好的耐蚀性;随着锌粉含量的增加,涂层耐蚀性提高.     

Weather-stable low-gloss powder coatings

Manufacturing weather-stable powder coatings with a matte surface and consistent quality is a challenge to the powder coatings industry. Technically acceptable results are achieved using the dry blend process, but one-shot formulations based on polyurethane raw materials or the use of a bifunctional polyurethane matte hardener offer interesting alternative solutions. Investigation of the powder coating films using a perthometer and an electron microscope provides a deeper understanding of the matte powder coating systems. LS-M/IC Geb. Q 24, D-51368 Leverkusen, Germany, e-mails: Peter.Thometzek.PT1@Bayer-AG.de; Ulrich.Freudenberg.UF@Bayer-AG.de; Hans-Ulrich.Meier-Westhues.HM@Bayer-AG.de. Industrial Chemicals Division, Coatings, 100 Bayer Rd., Pittsburgh, PA 15205-9741.     

The effect of cataphoretic and powder coatings on the strength and failure modes of EN AW-5754 aluminium alloy adhesive joints

The aim of this study is to determine the effect of cataphoretic and powder coatings and also the method of application the primer on the adherends surface on the strength and failure modes of EN AW-5754 aluminium alloy adhesive joints. The study is performed on lap joints made of EN AW-5754 aluminium alloy, subjected to three different types of surface treatment; namely a) polyurethane cataphoretic coating, b) powder coating based on black mat RAL 9005 UL polyester resin and c) no coating. The tested adhesive joints were made using a one-component polyurethane adhesive Terostat 8596, which was dedicated for automotive and cured under a constant load of 0.018 MPa at 20 ± 2 °C. In addition, this study investigates the effect of the application of Terostat 8519P adhesion promoter which is a liquid polyurethane-based primer containing solvents and which is corresponding to Terostat 8596 polyurethane adhesive. Terostat 8519P adhesion promoter was applied in two different ways: a) to one substrate and b) to both substrates. The produced adhesive joints were subjected to strength tests using the Zwick/Roell Z150 testing machine. The examination of fracture in the tested adhesive joints was performed in accordance with the EN ISO 10365 standard. The shear strength results have demonstrated that both the method of application of the adhesion promoter (Terostat 8519 P) and the presence of cataphoretic coating had an influence on adhesive joints strength. The use of the adhesion promoter significantly affects the strength of both uncoated EN AW-5754 aluminium alloy adhesive joints and the adhesive joints subjected to powder coating. The use of the adhesion promoter has a less significant effect on the cataphoretic-coated samples.