水性环氧富锌底漆的研究及评价

以水性环氧树脂、固化剂、锌粉、磷铁粉、防沉剂、闪锈剂等原料合成了水性环氧富锌底漆并进行了分析讨论。表明水性环氧富锌底漆具有溶剂型环氧富锌底漆防腐性好、附着力强等基本性能,又兼具水性无机富锌底漆低VOC和安全性的优点。     

氧化石墨烯/环氧富锌底漆的制备及性能研究

采用分散性能优异的氧化石墨烯(GO)代替环氧富锌底漆中的部分锌粉,制备了一种氧化石墨烯/环氧富锌底漆。采用X射线衍射分析仪、透射电子显微镜、扫描电子显微镜、盐雾试验仪、耐冲击测试仪、附着力测试仪等对氧化石墨烯/环氧富锌底漆中氧化石墨烯分散效果以及氧化石墨烯/环氧富锌底漆涂层的性能进行了方法分析。结果表明,氧化石墨烯添加量为0.5%时,氧化石墨烯/环氧富锌底漆中氧化石墨烯的分散效果最好,且氧化石墨烯/环氧富锌底漆涂层具有最佳的防腐性能。     

快干型水性环氧富锌底漆的研制

富锌底漆作为长效型钢结构重防腐涂料涂装配套体系的底漆与其他品种底漆相比,具有防腐性能强、耐热性优良、附着力好等优点。其按成膜物质不同可分为无机、有机、有机／无机掺合3类。有机富锌涂料常用环氧、氯化橡胶、乙烯基树脂和聚氨酯树脂为成膜基料,最为常用的是环氧富锌涂料。其中,聚酰胺固化环氧富锌底漆最常用。该类涂料的特点是长效防腐、表干时间快,     

几种防腐涂料的热稳定性比较研究

本文选用了五种底漆和六种面漆,通过组合使用,测定了在180℃热处理后防腐涂料的质量损失、失光程度、变色等级、附着力和硬度的变化,对比分析了不同底漆和面漆组合使用的热稳定性。结果发现:环氧富锌底漆配氟碳面漆的质量损失率最低为3.26%;热处理有利于提高漆膜的附着力和硬度;综合来看环氧云铁底漆配可复涂聚氨酯面漆和环氧富锌底漆配氟碳面漆表现出较高的热稳定性。     

聚苯胺在富锌底漆中的应用及对钢的保护性能研究

聚苯胺添加到环氧-富锌底漆中,其独特的导电性能被认为可以大大降低富锌底漆中锌粉的用量并提供有效的电化学保护,从而改善富锌底漆的施工性能和附着力,提高涂层性能。把纤维状的导电聚苯胺添加到环氧-富锌底漆中配制成复合涂层,通过测试不同涂层对Q235钢的保护效果,研究导电聚苯胺与锌粉的配合及其对锌粉的替代作用。     

石墨烯在环氧富锌底漆中的应用

用石墨烯替代环氧富锌底漆中的部分锌粉,制备了一种锌烯复合涂料。采用盐雾、耐冲击、附着力以及电化学等测试方法对不同石墨烯含量的锌烯复合涂料和环氧富锌底漆的性能进行了评价,并对锌烯复合涂料的防腐机理进行了分析。结果表明:石墨烯添加量为1%时,锌烯复合涂层具有最佳的防腐性能。     

新型高耐盐雾水性环氧富锌底漆的制备

介绍了一种既可降低水性环氧富锌底漆成本,又可提高其耐盐雾性的水性环氧富锌底漆制备方法。采用一种来源广泛的新型高效无毒防锈颜料,极大程度提高了水性环氧富锌底漆的防腐蚀能力,对水性环氧富锌底漆的推广应用起到了积极的作用。     

几种新型富锌涂料的研究进展

介绍了氧化石墨烯改性水性环氧富锌涂料、石墨烯纳米片/环氧富锌(Gnps/ZRE)复合涂料、高柔韧性、高附着力水性无机富锌涂料、石墨烯硅酸盐富锌防腐蚀涂料、水性聚苯胺/氧化石墨烯改性低锌粉含量防腐涂料、还原-氧化石墨烯(r-GO)改性环氧富锌涂料、耐盐雾双组分水性环氧富锌涂料、石墨烯浆料改性水性环氧富锌涂料、双电层水性无机富锌涂料、SnCl2/EtOH溶液法还原氧化石墨烯环氧富锌涂料、有机-无机杂化水性富锌涂料、水性富锌铝涂料、低锌含量石墨烯长效防腐涂料、自固化醇溶性无机富锌底漆和冷镀锌喷漆等几种新型富锌涂料的研究进展。     

影响富锌底漆性能关键因素的探讨

通过分析锌在热力学上比铁易于发生腐蚀,但动力学上锌的腐蚀速率远低于铁,为富锌底漆的长效防腐保护机理找到理论依据。通过研究不同标准对富锌底漆不挥发分中的锌含量要求,指出锌粉在富锌底漆中起到了十分关键的作用,必须在涂膜中保持一定的含量。通过比较环氧富锌底漆和无机硅酸富锌底漆的性能,指出必须对富锌底漆的现场施工产生足够的重视。     

高性能水性环氧富锌底漆的制备

以水性环氧乳液为基料,以改性胺为固化剂,制备了一种双组分水性环氧富锌底漆。试验结果表明:该水溶性环氧富锌底漆不仅具有优异的耐腐蚀性,而且具有良好的机械性能,各项性能指标与溶剂型富锌底漆相当,值得推广应用。     

醇溶性无机富锌底漆的研制

简述了醇溶性无机富锌底漆的研制及防腐机理,通过试验证明水的加入量对醇溶性无机富锌底漆的性能有显著的影响,PVB的加入能显著改善漆膜的性能,底漆与各种环氧、聚氨酯类中间漆、面漆的层间结合力良好。     

空心玻璃微球在环氧富锌底漆中的应用探讨

探讨了空心玻璃微球在环氧富锌底漆中对磷铁粉及锌粉替代对涂料耐盐雾性的影响,并讨论了不同空心玻璃微球在环氧富锌底漆中的选择。     

环氧富锌底漆防沉降的研究

系统地研究了防沉剂对环氧富锌底漆的性能影响。结果表明不同种类的防沉剂对环氧富锌底漆的分散性、增稠性、流变性、沉降性和贮存稳定性产生不同的影响,而对防腐性几乎不产生影响。     

高耐性水性环氧富锌底漆的制备与研究

为了制备高耐性的水性环氧富锌底漆,本文研究了环氧乳液粒径及其分布,活泼氢和环氧基的物质的量比对水性环氧富锌底漆的耐性尤其是耐盐雾、初期耐水性和耐闪锈性能的影响。实验结果表明,当环氧乳液粒径 ≤500 nm,且粒径分布均一,同时活泼氢和环氧基的物质的量比在 0. 8左右时,所得水性环氧富锌底漆的耐盐雾、初期耐水和耐闪锈性能达到最佳,其中耐中性盐雾可达 3 000 h,初期耐水性大于 480 h。此外,本文还研究了分散体系和防闪锈剂对耐盐雾、耐水和耐闪锈性能的影响,结果表明,选择高分子分散剂和与体系相容性好的防闪锈剂时,上述性能达到最佳。     

Adhesion and corrosion resistance of epoxy primers used in the automotive industry

One of the most important factors in corrosion prevention by protective coatings is the loss of adhesion of the coating under environmental influence. Thus, adhesion strength is often used when characterizing protective properties of organic coatings on a metal substrate. In this work, the adhesion of different epoxy primers (pigment-free, zinc-rich and chromate-based) was examined on steel. Both the dry and wet adhesion strengths of organic primers were measured directly by a pull-off standardized procedure, as well as indirectly by the NMP test. The corrosion stability of coated samples was investigated by electrochemical impedance spectroscopy. It was shown that under dry test conditions all the samples showed very good adhesion. However, different trends in adhesion for different primers during exposure to the corrosive agent (3% NaCl solution) were observed. The lowest adhesion values were obtained for chromate-based epoxy primer; however, the change in adhesion of this protective system during immersion in 3% NaCl solution for 25 days was the smallest of all investigated samples. Electrochemical impedance measurements in 3% NaCl solution confirmed good protective properties of pigmented epoxy primers on steel, i.e., greater values of pore resistance and charge-transfer resistance, and smaller values of coating capacitance and double-layer capacitance, were obtained for these protective systems.     

Investigation of cardanol-based reactive polyamide as a crosslinker in epoxy zinc-rich primer

Cardanol-based reactive polyamides with different amine functionalities were successfully developed by conventional polycondensation mechanism. The synthesis involved 2-step processes of functionalization of cardanol by maleic anhydride followed by its condensation with diethylenetriamine in the second step. The polyamides with different molecular weights were prepared by varying the mole ratios of acid and amine components in the formulation. The developed polyamides were characterized for structural confirmation by FTIR and NMR spectroscopy. These polyamides were then used as crosslinker in conventional epoxy zinc-rich primer. The effect of molecular weights of these polyamides on mechanical, chemical, and solvent resistance properties of conventional epoxy zinc-rich primer was studied and compared with that of commercial polyamide. The anticorrosive properties of the primers were evaluated by humidity resistance test, salt spray test and electrochemical impedance spectroscopy. The study revealed that the epoxy zinc-rich primers cured with cardanol-based polyamide resulted in improved mechanical, chemical, and anticorrosive properties as evaluated by various methods.     

高性能水性工业防腐涂料配套体系的研究与应用

以自制高性能水性丙烯酸聚氨酯树脂(PUA)乳液为主要基料,制备了高性能水性防腐面漆,并研究了以水性环氧富锌底漆、水性环氧云铁中间漆为配套的水性工业防腐配套体系,并进行常规性能、耐化学介质、耐盐雾、耐人工老化等性能的检测分析。结果表明,以高性能水性工业防腐配套体系的防腐涂料可替代传统的溶剂型防腐涂料在相关领域的应用。     

EIS法研究3种配套涂层体系的腐蚀电化学行为

采用电化学阻抗谱(EIS)研究了由水性无机富锌底漆、环氧中间漆和氯化橡胶面漆3种涂料配套而成的3种不同涂层体系在3.5%NaCl溶液中的电化学腐蚀行为,考察了氯化橡胶面漆、水性无机富锌底漆／氯化橡胶面漆、水性无机富锌底漆／环氧中间漆／氯化橡胶面漆这3种涂层体系的阻抗谱在浸泡过程中的演化并据此比较了3种涂层体系的防护性能。结果表明,两涂层体系的防护性能比单涂层的还要差,三复合涂层体系的防护性能最好。根据涂层腐蚀电化学阻抗谱特征推测,中间漆在三复合涂层体系中起到了使底漆和面漆结合更加紧密的桥梁作用。