有机硅改性聚酯的合成及其粉末涂料的性能

利用有机硅中间体合成了有机硅改性聚酯树脂。通过IR、GPC、SEM等分析了改性聚酯的结构与形态 ,用电子探针分析了改性聚酯的表面组成 ,考察了有机硅含量对改性树脂玻璃化温度、熔融黏度、对水的接触角及表面张力的影响。研究发现 ,改性聚酯中的含硅聚酯在表面富集 ,大大降低了聚酯树脂的表面张力 ,提高了其粉末涂料的涂膜耐候性。相对于纯聚酯树脂 ,有机硅质量分数为 1 %可使树脂的表面张力从 49.5降到 2 8.4mN/m ;经 2 1 6h中波紫外线照射后 ,涂膜的光泽保留率从 81 %上升到 91 .3 %。含有机硅质量分数超过 5 %后 ,涂膜的抗冲性能下降。     

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。     

不含TMA混合型粉末涂料用聚酯树脂的合成与性能研究

以对苯二甲酸、间苯二甲酸、新戊二醇、三羟甲基丙烷等为原料合成了一种不含偏苯三酸酐(TMA)的70/30混合型环氧固化饱和聚酯树脂,并研究了合成单体对聚酯树脂性能的影响。将该聚酯树脂制备成粉末涂料,对比了公司另外两款混合型聚酯树脂,进行了涂层成膜物质含量及聚酯消光性能方面的研究。实验结果表明,用该树脂制备的粉末涂层具有良好的流平和机械性能,通过与部分自产树脂性能对比,发现原料TMA对粉末涂料固化活性及耐水煮性能产生较大影响,而在消光性能方面该树脂与同类含TMA的树脂性能差异不大。     

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,...     

羟基聚酯树脂的合成及其在美术型粉末涂料中的应用

介绍了一种粉末涂料用端羟基聚酯树脂的合成,用差热分析仪(DTA)分析了聚酯树脂的玻璃化转变温度(Tg),测试了树脂酸值、羟值和熔融黏度等理化指标;由聚酯树脂制成皱纹、龟纹等美术型粉末涂料,讨论了羟值和单体对羟基聚酯合成皱纹粉末涂料纹理效果的影响;讨论了不同粉末涂料配方对龟纹粉末涂料纹理效果的影响;测试了聚酯树脂粉末涂料...     

高酸值聚酯树脂在干混消光涂层中的应用研究

研究不同种类高酸值树脂对干混消光粉末涂层光泽、流平以及细腻度的影响规律,通过改变高酸树脂合成中单体的种类、数量以及活性,合成不同种类的高酸值聚酯树脂.采用差式扫描量热仪(DSC)测试其玻璃化转变温度(Tg),并将合成的聚酯树脂与固化剂、颜填料和助剂制备成90/10异氰脲酸三缩水甘油酯(TGIC)固化型快组份粉末涂料,采...     

亚光粉末涂料用60/40混合型聚酯的制备及其性能研究

研究了三羟甲基丙烷、二甘醇和乙二醇对聚酯树脂消光性能的影响,制备了一种适用于聚酯/环氧体系亚光粉末涂料用60/40聚酯树脂,同时针对该聚酯在亚光粉末涂料中的应用展开了与消光剂适应性和烘烤炉温适应性的研究。试验结果表明：合成的60/40消光聚酯与不同种类消光剂匹配性好,同时烘烤炉温波动对粉末涂料性能影响较小,利用该聚酯制备的亚光粉末涂料还具有良好的机械性能和平整细腻的外观。     

有机硅改性丙烯酸阳极电泳漆的合成

以乙醇为溶剂,将正硅酸乙酯(TEOS)与乙烯基三乙氧基硅烷(VTEOS)经酸催化合成了一种表面带有乙烯基的活性二氧化硅粒子,然后将其与丙烯酸树脂聚合得到透明的有机硅改性阳极电泳漆。研究了有机硅的添加方式对反应过程,有机硅含量对改性丙烯酸树脂的玻璃化转变温度、黏度以及电泳漆性能的影响,采用傅里叶变换红外光谱、差示扫描量热和热重分析等对改性丙烯酸树脂进行了表征。结果表明,有机硅的最佳添加方式是与部分单体预混后逐滴滴加。随着有机硅含量的增大,改性丙烯酸树脂的黏度、玻璃化转变温度和耐热性提高。当有机硅添加量为0.8%~1.2%时,电泳漆膜的综合性能较好。     

导读

<正>曾定等合成了一种适用于我国南方气候特点下的粉末涂料用聚酯树脂,讨论了不同用量的间苯二甲酸、三羟甲基丙烷和2-乙基-2-丁基-1,3丙二醇对合成的聚酯和粉末涂料性能的影响,并在实验室模拟了我国南方地区高温度、高湿度和高辐照度对涂层老化的影响。张全伟等以有机硅改性聚酯树脂为基料,选用碳化硅等为耐磨填料,二硫化钼等为润滑填料,制备了一种具有优异机械性能和良好防腐蚀性能的耐磨涂料。     

汽车轮毂罩光用亚光透明粉末涂料的研究与应用

研究了高耐候亚光透明粉末涂料配方的消光体系、树脂的耐候性、消光剂的种类、流平剂的透明度、紫外线吸收剂对耐候性的影响,以及潜伏性促进剂的使用,制备了适用于汽车铝轮毂罩光用亚光透明粉末涂料,并研究了其在汽车铝轮毂涂装中的施工性和应用效果。还研究了汽车铝轮毂罩光用亚光透明粉末涂料与高光丙烯酸型透明粉末涂料的兼容状况和烘烤温度适应性,最终制备了可以和高光环氧基丙烯酸透明粉末涂料共用生产线的亚光透明粉末涂料,依据汽车铝轮毂罩光用粉末涂料各项指标要求,该涂料综合性能相当,且在健康环保、节能、成本和贮存稳定性方面更具优势。     

Gloss reduction in low temperature curable hybrid powder coatings

This study describes the crucial role played by acrylic resin and curing agents in the gloss reduction of low temperature curable hybrid powder coatings. The incompatibility of the acrylic resin with the primary (epoxy/polyester) resins induces a two-phase morphology and initiates the formation of micro-structured surface. DSC measurements on various mixtures reveal the relative reactivity and the role of curing agents in the gloss reduction. These results indicate that the optimization of relative reactivity and compatibility is required to achieve low gloss coatings at low curing temperature. In addition, the gloss level is strongly affected by extruding conditions. These experimental results give a possibility to develop matt and semi-matt low temperature curable powder coatings.     

Silicone-acrylic hybrid aqueous dispersions of core–shell particle structure and corresponding silicone-acrylic nanopowders designed for modification of powder coatings and plastics. Part III: Effect of modification with selected silicone-acrylic nanopowders on properties of polyurethane powder coatings

Polyurethane powder coating systems consisting of polyester resin, blocked polyisocyanate and two types of “nanopowders” containing core–shell nanoparticles where the core was silicone resin of very low glass transition temperature and the shell was poly(methyl methacrylate) were examined. The blocked polyisocyanate was synthesized using biuretpolyisocyanate obtained from ureapolyisocyanate as starting material capable for blocking and ɛ-caprolactam as blocking agent. The surface properties of cured powder coatings were investigated using scanning electron microscopy (SEM) combined with energy dispersive spectrometry (EDS), X-ray photoelectron spectroscopy (XPS) and atomic force microscopy (AFM). The surface structure was correlated with the chemical structure of the coatings and macroscopic surface behavior: contact angle, surface free energy, gloss, abrasion resistance, hardness and adhesion to the steel surface.     

耐候低光粉末涂料用丙烯酸树脂的合成研究

研究了耐候低光粉末涂料用环氧基丙烯酸树脂的合成规律及其在粉末涂料中的应用。讨论了单体、溶剂、引发剂的选择和用量等对树脂性能的影响,得到的丙烯酸树脂用于粉末涂料,其光泽稳定易控制、耐候性优异。     

W61-800各色有机硅耐高温涂料研究

以改性有机硅树脂为成膜物,添加如云母粉、石英粉、石棉粉等填料及低熔点耐高温玻璃粉和陶瓷粉、耐高温颜料、助剂及溶剂制备出一种具有良好耐热性和耐蚀性、在约800℃下可长期使用的耐高温防腐蚀涂料。     

Preparation and characterization of weather resistant silicone/acrylic resin coatings

Preparation and characterization of weather resistant silicone/acrylic resin coatings were conducted. In order to prepare these coatings, a silicone/acrylic resin (KLD) was first prepared by an addition polymerization reaction of monomers, including n-butyl acrylate, methyl methacrylate, n-butyl methacrylate, and 3-methacryloxypropyltrimethoxysilane (MPTS). In the preparation of the silicone/acrylic resin, T_g of the acrylic copolymer was fixed at 40°C and the contents of MPTS were varied to be 10, 20, and 30 wt%. The weather resistant silicone/acrylic resin coatings were then prepared by blending the synthesized silicone/acrylic resin and TiO₂. The viscosity of the synthesized resin decreased with the content of MPTS, whereas the thermal stability at high temperature increased. The prepared coatings exhibited excellent adhesion to various substrates, and various physical properties of the coatings were satisfactory. The weatherability of the coatings was tested three ways: outdoor exposure test, Weather-Ometer (WOM), and QUV accelerated weatherability tester (QUV). The gloss retention, yellowness index difference, color difference, and lightness index difference were improved at high MPTS concentration. The coatings containing 30 wt% MPTS have especially good weather properties. Dept. of Chem. Eng., Yongin 449-728, Korea. Ansan 425-110, Korea.