低温阴极电泳漆的制备及性能

随着人们对环境保护以及低能量消耗要求的不断提高,低温固化阴极电泳漆已经成为电泳漆的发展趋势之一。合成了封闭物异氰酸酯固化交联剂,并探讨了反应时间和反应温度对封闭率的影响,最后以氨化改性环氧树脂为基料树脂合成了低温固化阴极电泳漆。实验结果表明：在150℃／20min的固化条件下,漆膜能得到完全固化,经过漆膜综合性能实验,在选择合适的电泳工艺参数下,可以得到硬度较高、耐潮、耐盐、耐酸碱性能好的漆膜。     

基于丙烯酸接枝环氧树脂的防腐蚀铁红底漆制备及性能研究

根据自由基聚合机理先合成不同比例的丙烯酸接枝环氧树脂,然后加入铁红、云母粉、磷酸锌、三聚磷酸铝制备成漆料,最后加入聚酰胺树脂650固化得到丙烯酸接枝环氧树脂的铁红底漆。利用红外光谱(FT-IR)、热重(TGA)等对制备的丙烯酸-环氧树脂及加聚酰胺树脂固化的丙烯酸-环氧树脂进行分析测试,并通过仪器对涂膜的各项力学性能进行了测试。结果表明:改性后漆膜表现出优异的硬度、附着力、柔韧性、耐冲击性及优良防腐性能。     

固化剂对水性汽车罩光清漆固化膜性能的影响

合成了水性丙烯酸树脂并用其配制了汽车罩光清漆,通过FT-IR、DSC,TG和SEM分析研究了不同固化剂、固化剂用量对漆膜性能的影响。结果表明,Luwipal066作为固化剂,固化剂/树脂质量比为40/100,固化温度及时间分别为140℃和30min时,固化漆膜性能最好,光泽度达到98/60°,冲击强度为50kg·cm,硬度为2H,附着力为0级,耐溶剂、耐紫外老化性能良好,指标达到汽车罩光漆膜的要求。漆膜固化后表征羟基和甲氧基的吸收峰强度显著变弱,表明氨基树脂和丙烯酸树脂发生了交联固化。随着硬/软单体配比和固化剂/树脂配比的增加,固化漆膜的Tg升高,具有良好的热稳定性。     

紫外光固化阴极电泳涂料用丙烯酸树脂的合成及应用

以甲基丙烯酸二甲胺乙酯(DMAEMA)、甲基丙烯酸羟乙酯(HEMA)、丙烯酸异辛酯(EHA)、甲基丙烯酸甲酯(MMA)和苯乙烯(St)为共聚单体制备了阳离子型丙烯酸树脂,再利用含异氰酸根的不饱和单体对其进行接枝改性得到光敏树脂,合成了紫外光(UV)固化阴极电泳涂料.红外光谱表征证明得到了目标产物.考察了电泳工艺对漆膜厚度、闪蒸条件对漆膜性能以及光固化条件对双键转化率的影响,获得了最佳电泳工艺为、闪蒸工艺和固化条件,分别为:电泳电压80 V,电泳时间90 s;闪蒸温度80 ℃,闪蒸时间5min;引发剂用量3%(质量分数),固化时间70 s,此条件下固化所得漆膜平整、光亮,性能优异.     

醛酮树脂在紫外光固化色漆中的应用研究

在紫外光固化色漆体系中选用醛酮树脂参与辅助成膜物的紫外光固化涂料的研制。讨论了醛酮树脂对体系的颜料润湿性、成膜附着力、涂膜硬度、丰满度的影响。最后得出了选择合适醛酮树脂在紫外光固化色漆中应用可以提高漆膜附着力,改变硬度,增加漆膜的丰满度和体系的润湿性能。     

水性卷材涂料用聚酯树脂的制备及涂层性能研究

本文采用间苯二甲酸-5-磺酸钠(5-SSIPA)对聚酯树脂进行改性,合成了一种水性改性聚酯树脂,并用其制备卷材涂料,研究了影响涂层性能的因素.结果表明:通过两步法的工艺,将亲水性功能单体5-SSIPA引入聚酯树脂中,亲水性功能单体5-SSIPA的用量越大,树脂的亲水性越好,但是其用量太大,表面固化反应速度太快,会影响漆膜的性能.     

热塑性丙烯酸酯树脂在紫外光固化涂料中的应用

在紫外光固化体系中引入非紫外光固化的热塑性丙烯酸酯树脂作为辅助成膜物.讨论了其对体系成膜附着力、柔韧性、硬度、光泽的影响.实验结果表明：选择合适相对分子质量的热塑性丙烯酸酯树脂可以改善紫外光固化涂料的附着力和柔韧性等漆膜性能.     

含环酸酐羟基丙烯酸树脂清漆的固化性能及机理

将含环酸酐羟基丙烯酸树脂与固化剂HDI三聚体复配,制备了树脂清漆,研究了HDI三聚体用量、固化时间和环境湿度对清漆固化性能的影响,采用红外光谱对清漆固化前后的结构进行了表征,并对其固化机理进行了探讨。结果表明:当HDI三聚体用量为0.4%,固化时间为180 min,环境相对湿度为(70±2)%以上时,所得漆膜的光泽度96%,柔韧性2 mm,附着力1级,硬度2H,综合性能良好。由于树脂分子结构中含有—OH、—COOH和环酸酐基团,清漆可实现三重固化。     

新型低温亚光丙烯酸氨基烤漆的制备与性能研究

制备了一种新型的低温亚光丙烯酸氨基烤漆,并对酸催化剂、丙烯酸树脂对漆膜性能的影响进行研究。结果表明,该烤漆在100℃下即可快速交联固化,可有效降低烘烤能耗。而且,选择合适的酸催化剂与丙烯酸树脂搭配,可使漆膜的硬度、附着力、耐水性、耐盐雾性、贮存稳定性等综合性能优异。     

稳定性水性环氧树脂乳液的制备及其成膜耐腐蚀性能分析

采用相反转法制备了一种水性环氧树脂乳液,分析了乳液稳定性的影响因素。考察了固化剂种类、掺量对乳液固化效果的影响。基于FTIR方法验证了乳液固化效果,并测试了乳液固化后漆膜的性能,分析了该乳液用于防腐蚀涂料底漆的可行性。研究结果表明,乳化剂质量分数为6%,树脂固含量为50%以上时,制备的乳液粒径集中分布在1 100~1 200 nm范围,稳定性良好;固化剂质量分数在50%时,漆膜硬度达到5H,附着力为1级以上,且耐碱性能良好,具有用于混凝土防腐涂料底漆的可行性。     

环氧树脂室温固化体系的研制及性能研究

以兼具引发剂和稀释剂功能的自制BH-1为固化剂,通过引入低黏度活性稀释剂,制备室温固化EP(环氧树脂)胶粘剂;然后以EP/BH-1/活性稀释剂为基体、单向玻璃纤维为增强材料,制备相应的复合材料。研究结果表明:当w(BH-1)=4%时,EP浇铸体的室温(25℃)凝胶时间约为8.5 h和玻璃化转变温度(Tg)为130.9℃,并具有优异的力学性能,其冲击强度为50.0 kJ/m2、拉伸强度和模量分别为0.075 GPa和2.80 GPa、弯曲强度和模量分别为0.136 GPa和3.02 GPa;当m(EP)∶m(BH-1)∶m(活性稀释剂)=100∶4∶10时,复合材料的弯曲强度(0.984 GPa)和层间剪切强度(56.1 MPa)分别提高了26.4%和15.2%。     

丙烯酸酯-富马酸酯共聚乳液的合成及表征

采用半连续乳液聚合方法,以甲基丙烯酸甲酯（MMA）、富马酸二丁酯（DBF）为主单体,丙烯酸（AA）为功能单体,十二烷基硫酸钠（SDS）为乳化剂,过硫酸钾（KPS）为引发剂,合成了固含量为30%的共聚物乳液。探讨了单体配比、SDS用量、KPS用量对乳液及胶膜性能的影响。结果表明,乳胶粒子有核壳结构,当DBF/MMA比例为1/1.5,SDS为单体总质量的3%,KPS为0.4%时,乳液涂料综合性能达到最佳,涂膜光泽度、附着力良好,力学性能及耐化学试剂性能优良。     

聚醚二元醇不饱和聚酯树脂及其柔性固化体系

研究了不同含量聚醚二元醇对柔性不饱和聚酯树脂(UPR)技术和性能指标的影响,并用其合成了一种综合性能较好的柔性不饱和聚酯树脂,研究了交联单体及其固化体系对聚醚合成的柔性不饱和聚酯树脂性能的影响。实验结果表明,合成的柔性UPR的拉伸强度为2．438 MPa,拉伸模量为3．7 MPa,伸长率为65．4%。而邵氏A硬度为65．8。获得了最佳稀释剂、促进剂和固化剂用量比例,即苯乙稀含量为33%～36%,促进剂和固化剂比为1∶1,用量为0．8%～1%。     

溶胶-凝胶/环氧杂化涂料的应用

溶胶-凝胶/环氧杂化涂料的配方已经进行了研究,杂化涂料具有更强的机械强度(如硬度),更加耐磨蚀。当固化温度提高到80℃,全部研究的杂化涂料都能通过湿性黏结试验,但在室温下固化时仅有部分的杂化涂料通过湿性黏结试验。多数杂化涂料在室温下固化时对水的敏感性问题尚待解决。     

A photo-curing study of a pigmented UV-curable alkyd

The photo-curing of a pigmented UV-curable tung oil alkyd system (UVTA) was investigated. The UV-curable alkyd was a Diels–Alder Adduct of trimethylolpropane trimethacrylate with a tung oil-based alkyd. A mixture of yellow iron oxide, red iron oxide, titanium dioxide and lamp black pigments were chosen to obtain an observed yellow color. The pigment mixture, UV-curable alkyd and a reactive diluent were formulated together and photo-cured via a free radical mechanism. The through and surface cure was assessed by thumb twist, blocking resistance and MEK single rub. The through cure and surface cure assessment showed that optimum cure was achieved using UV-A as a source with two photoinitiators: phenylbis(2,4,6-trimethylbenzoyl-phosphine oxide) at 2 wt% and 1-hydroxy-cyclohexyl-phenyl-ketone at 4 wt%. The effect of reactive diluent was also investigated. Ten different reactive diluents were used. After curing, pencil hardness, conical mandrel, impact resistance, cross cut adhesion and gloss were measured. In addition, dynamic mechanical thermal analysis (DMTA) was used to evaluate selected systems. The coatings tests showed that the use of long chain linear structure diluents, such as isodecyl methacrylate, provided UV-curable paint films with better impact resistance, flexibility, and adhesion over other reactive diluents.     

紫外光固化松香基聚酯丙烯酸酯的合成研究

通过两步法合成了涂料用紫外光固化(UV)松香基聚酯丙烯酸酯(APAPEA)预聚物。对产物结构进行了红外表征,并采用DSC分析研究了其光固化行为。考察了酸醇物质的量比、合成工艺、反应温度及催化剂用量对APAPEA收率的影响。结果表明,适宜的合成条件为:醇酸物质的量比1.1∶1,慢速升温,反应温度120℃,催化剂用量0.8%~1.2%。合成的APAPEA涂膜固化速度67 s,硬度3H,柔韧性2 mm,附着力1级,耐冲击性50 cm,较市售聚酯丙烯酸酯(PEA400)固化速度快,涂膜硬度高,柔韧性及附着力相当,可作为UV固化涂料用低聚物。     

Effect of composition on performance properties in cationic UV-curable coating systems

Cycloaliphatic epoxides have been widely studied in the coatings industry because of the excellent mechanical properties of films prepared using these monomers and various diluents. In this study, polyol was studied as a diluent for formulations containing cycloaliphatic epoxide and oxetane in order to evaluate the effect on coatings properties and curing kinetics. The addition of polyol was shown to have an effect on both mobility of the cation as a chain transfer agent, along with the more general effect of flexibility, as evidenced by the hardness data, which increased when a small amount of polyol was added, but decreased as more polyol was included in the formulation. In terms of crosslinking kinetics, it was found that the inclusion of polyol resulted in an increase in conversion during UV irradiation. The level of polyol also had an effect on other properties, such as T_g and crosslink density. Presented at the 81 st Annual Meeting of the Federation of Societies for Coatings Technology, on November 12–14, 2003, in Philadelphia, PA.     

Evaluation of mechanical properties and hydrophobicity of room-temperature,moisture-curable polysilazane coatings

Polysilazane coatings have a broad need in real-life applications, which require low processing or working temperature. In this work, five commercially available polysilazanes have been spin-coated on polycarbonate substrates and cured in ambient environment and temperature to obtain transparent, crack-free, and dense films. The degree of crosslinking is found to have a significant impact on the hardness and Young's modulus of the polysilazane films but has a minor influence on the film thickness and hydrophobicity. Among all five polysilazane coatings, the inorganic perhydropolysilazane-based coating exhibits the largest hardness (2.05 ± 0.01 GPa) and Young's modulus (10.76 ± 0.03 GPa) after 7 days of curing, while the polyorganosilazane-derived films exhibit higher hydrophobicity. The molecular structure of polysilazanes plays a key role in mechanical properties and hydrophobicity of the associated films, as well as the adhesion of coatings to substrates, providing an intuitive and reliable way for selecting a suitable polysilazane coating material for a specific application.     

Testing of adhesion of thin films to substrates

The results of the measurement of the adhesion strength of thin films or coatings to substrates are often influenced by system parameters that may be influenced by preparation of the specimen for testing or by deposition of the film itself. In this paper, the scratch, pull, and peel tests are analyzed in terms of criteria for film/coating removal and for the effects of system parameters such as film hardness and ductility, film thickness, substrate hardness, etc.     

An efficient fully bio‐based reactive diluent for epoxy thermosets: 2‐[(Oxiran‐2‐ylmethoxy) methyl] furan versus a petroleum‐based counterpart

Furfuryl alcohol and bio‐based epichlorohydrin were used to prepare a fully bio‐based reactive diluent, 2‐[(oxiran‐2‐ylmethoxy) methyl] furan (FOM). After spectral characterization, FOM was blended with epoxy resin, diglycidylether bisphenol A (DGEBA), at different ratios for reducing the viscosity. For a comparison, Cardura (one of the most common commercial reactive diluents), was separately incorporated to DGEBA. Amine‐curing process of the blends was recorded by FTIR and DSC. Similar trends of curing progression for DGEBA containing the reactive diluents were observed. Thermogravimetric analysis and dynamic mechanical thermal analysis, mechanical (hardness, adhesion, and stress–strain) and morphological properties were also investigated to study characteristics of the epoxy matrices formulated with FOM or Cardura. It was concluded that FOM could be considered as an efficient reactive diluent in formulations of polymer composites, structural adhesives and surface coatings based on epoxy resins. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44957.