无机硅酸锌预涂底漆的研制

介绍了无机硅酸锌预涂底漆成膜机理、硅酸乙酯水解、改性及主剂的制备。通过对硅酸乙酯改性,增加了无机硅酸锌预涂底漆漆膜的柔韧性;采用耐盐雾实验选择了防锈颜料磷酸锌、B-004磷铁粉及5%的锌粉添加量;通过对比无机硅酸预涂底漆的施工性、耐盐雾性及储存稳定性,确定了聚乙烯缩丁醛树脂液的加量,选用了HX-8800和BYK-420作为产品防沉剂,调整溶剂体系添加1%CB溶剂控制漆膜干燥速度,并最终确定了产品配方。此产品满足流水线自动喷涂工艺,干燥时间短、防锈性能好、可与多种面漆配套使用,并且不影响焊接和切割。     

玻璃纤维改性无机硅酸锌涂层的柔韧性研究

采用玻璃纤维增韧无机硅酸锌涂层,并对其柔韧性进行了研究。结果表明:添加硅烷偶联剂和苯丙乳液共同表面改性后的玻璃纤维能显著提高无机硅酸锌涂层的柔韧性。玻璃纤维的合适添加量为涂料总质量的0.3%。进一步对涂层微观结构分析发现,玻璃纤维增韧无机硅酸锌涂层的机理主要是玻璃纤维脱黏、桥接以及纤维从涂层基体的拔出。     

水性无机硅酸锌防锈漆

水性无机硅酸锌防锈漆系双组分自固化体系，其硅碱比高达5．7，能与锌粉发生交联聚合反应，产生硅酸锌网状分子聚合物，形成坚硬的陶瓷性涂层。具有优异的防腐蚀、耐海水、耐油性、耐溶剂性、耐盐雾性，广泛用于钢结构防腐蚀领域。文章还述及其底漆、面漆组分、性能及其配套体系、施工方法。     

鳞片型醇溶性无机富锌涂料研制成功

摘自：www．china—painting．net 北京航材百慕新材料技术工程股份公司研究人员采用醇溶性硅酸烷基酯树脂研制新型鳞片型醇溶性无机富锌涂料。涂料所用的颜料为自制鳞片状锌粉,树脂基料为自制正硅酸乙酯水解液,考察了鳞片型醇溶性无机富锌涂层与球锌醇溶性无机富锌涂层的屏蔽性、导电性和耐盐雾性,     

还原氧化石墨烯对水性无机富锌涂料防腐性能的影响

为提高水性无机富锌涂层的防腐性能，以高模数硅酸钾溶液和氟碳乳液为成膜物质，片状锌粉为主要功能填料，并添加适量还原氧化石墨烯分散液作为辅助填料，制备了硅酸盐水性无机富锌涂料。采用物理性能测试、电化学测试、盐雾试验等测试方法，探究了还原氧化石墨烯添加量对涂层防腐性能的影响。结果表明：加入适量还原氧化石墨烯，可以增强水性无机富锌涂料的防腐性能，当涂料中还原氧化石墨烯分散液添加量达到6%时，涂层的力学性能及耐腐蚀性最佳，经过腐蚀后的主要腐蚀产物为Zn₅(OH)₈Cl₂和ZnO。     

富锌涂层在模拟海水中的失效机制

在筛选试验涂层体系基础上,通过浸泡、盐雾、阴极剥离、腐蚀电位监测和微观形貌分析,对12种舰船常用的无机富锌和有机富锌配套体系的腐蚀失效行为和机理进行研究。结果表明:在NaCl模拟海水条件下,无机富锌耐阴极剥离性能差;基于无机富锌涂层与有机富锌涂层配套体系的阻抗谱,环氧富锌涂层将比无机富锌具有明显的防护效果。     

石墨烯在片锌基无机富锌涂料中的应用研究

采用石墨烯与片状锌粉取代醇溶无机富锌涂料中的球状锌粉,以正硅酸乙酯水解液为成膜物质,制备了一种全片层状结构的鳞片型醇溶无机烯锌涂料;采用盐雾、与水接触角、附着力、SEM等测试方法对不同石墨烯含量的鳞片型醇溶无机烯锌涂料的性能进行了评价,并对其耐蚀机理进行了分析。     

几种无机富锌涂层耐腐蚀性能的试验评价

分别采用人工海水浸泡试验、导电性测试、水汽渗透试验和中性盐雾试验等方法评价了4种无机富锌涂层的耐腐蚀性,结果表明:不同方法得到的结果基本一致,鳞片型无机富锌涂料和无机磷酸盐富锌涂料具有良好的耐腐蚀性,而水性无机硅酸锌涂料和水性无机富锌涂料耐蚀性相对较差.电镜观察表明:鳞片型无机富锌涂料和无机磷酸盐富锌涂料中的锌粉结构均匀、排列致密,起到了良好的屏蔽及导电作用;而水性无机涂料中的锌粉大小、分布都不均匀,导致其保护效果降低.     

改性磷酸锌的防腐性能研究

研究了两种改性磷酸锌(磷酸铁锌、磷钼酸锌)的防腐性能,并与普通磷酸锌、铬酸锌的防腐性能进行对比.首先,采用电化学方法分析了防锈颜料提取液的防锈性能,结果表明磷钼酸锌的防锈性能优于普通磷酸锌,而磷酸铁锌的防腐性能反而不如普通磷酸锌,而磷酸系颜料的防锈性能均不如铬酸锌.其次,通过盐水浸泡和盐雾实验对几种防锈颜料在环氧涂层中的防腐性能进行了研究.盐水浸泡过程中的电化学阻抗谱表明磷酸铁锌能显著提高涂层的屏蔽作用,而通过涂层划痕后进行ASTM B-117实验发现磷酸铁锌能显著提高涂层与金属界面的附着力和涂层的屏蔽作用,而磷钼酸锌能提高涂层的耐锈蚀能力.从实验结果可以看出两种改性磷酸锌防锈颜料均可在实际应用中代替铬酸盐用于防腐涂料中.     

醇溶性无机富锌涂料的研制及性能研究

介绍了醇溶性无机富锌涂料的制备方法并研究了正硅酸乙酯水解液中水的用量、聚乙烯醇缩丁醛、空气湿度和锌粉用量对涂膜性能的影响。结果表明:聚乙烯醇缩丁醛(PVB)改性后涂膜的耐冲击性、柔韧性和附着力都有明显提高;醇溶性无机富锌涂料靠吸收空气中的水固化成膜,空气湿度对固化性能的影响很大,湿度越小,实干时间越长,甚至长时间不会固化,湿度越大,固化反应越快;干膜中锌含量越大形成的涂膜越致密,涂料的初期耐水性、涂膜的附着力和耐盐雾性越好,当正硅酸乙酯水解液中水的用量为10.5 g、干膜中锌含量为80%时,涂膜耐中性盐雾时间可达4 200 h。     

钠水玻璃富锌涂料固化机理的探讨

以硅酸钠溶液为成膜基料,锌粉为颜填料,去离子水为溶剂,加入增稠剂,固化剂等助剂,制备钠水玻璃富锌涂料;应用红外光谱分析、流变学测量和耐液性观察,研究钠水玻璃富锌涂料的固化机理。结果发现,其固化机理主要是硅酸之间的脱水反应和锌离子对硅酸的交联;流变学测试显示,粘度随温度的上升先减后增,随时间增加;用光学显微镜观测固化后的富锌涂膜分别在水、稀酸和碱溶液中浸泡后的状态变化,定性应证了这个机理。     

Chloride-free biodegradable organic acid hydrolyzed zinc silicate coating

Partially hydrolyzed ethyl silicate has widely been used as a binder to formulate inorganic zinc silicate paint for anticorrosive coating applications. Hydrochloric acid is used most popularly to catalyze the hydrolysis of ethyl silicate. Although different acids have been tried as catalysts for ethyl silicate hydrolysis, no attempt has been made to make stable paints out of those hydrolyzed silicate binders. In this study, environment benign biodegradable organic acids such as oxalic acid, citric acid, lactic acid and acetic acid were used for the hydrolysis of ethyl silicate and compared with the hydrolysis using conventional hydrochloric acid. The hydrolyzed silicate sols were pigmented further with silica powder and evaluated for their stability. Of the various organic acids catalyst used, only oxalic acid catalyzed sol acted as a stable binder system. The pigmented binder was then mixed with metallic zinc to formulate anticorrosive inorganic zinc silicate paint. The resultant coatings were characterized for various physical, surface, mechanical and chemical resistance properties such as drying, hardness, adhesion (cross hatch) and solvent resistance. Corrosion resistance properties were analyzed by means of salt spray, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS). The results revealed that the physical, mechanical, chemical and anticorrosive properties of the coating hydrolyzed with hydrochloric acid and oxalic acid are comparable. Thus, a chloride free biodegradable organic acid hydrolyzed inorganic zinc silicate primer is reported and due to its long term stability same also can be scaled up commercially.     

水性无机建筑涂料热贮存稳定性的影响因素探讨

以胶体二氧化硅溶液和改性液态硅酸钾为主要无机成膜物质,苯丙乳液为有机改性剂、合成硅酸镁锂为增稠防沉剂、以金红石型钛白粉、煅烧高岭土、重质碳酸钙、滑石粉等为颜填料制备了一种性能优异、热贮存稳定性良好的水性无机建筑涂料,讨论了胶体二氧化硅和改性硅酸钾的种类、不同增稠剂、改性有机高聚物乳液、颜填料等对其热贮存稳定性的影响,并对涂层的施工性能,耐洗刷性能、耐水、耐碱性能等进行了评估。     

一种改性硅酸盐胶粘涂层的制备

通过正交试验优选出了改性硅酸盐无机胶粘涂层的最优配方(质量分数):钠水玻璃44.4%、二氧化硅25.50%、氧化铝28.40%、铝粉1.65%,余量为水。研究了固化工艺参数对胶粘涂层性能的影响。结果表明,胶粘涂层室温放置8h后,在120°C下烘烤5h,所得涂层的剪切强度为25.3MPa,在水中浸泡24h的吸水率为0.20%。该涂层在1000°C以内热稳定性良好。     

硅酸盐矿物/TiB2复相陶瓷涂层的制备及耐蚀性能研究

本文采用热化学反应法在Q235钢基体表面分别制备了硅酸盐矿物陶瓷涂层和添加Al-TiO2-B2O3反应体系复相陶瓷涂层,用XRD分析其相结构,并研究了涂层的耐蚀性。结果表明,硅酸盐矿物/TiB2复相陶瓷涂层有TiB2、FeNi3、CaNi0.5Si1.5等新相产生。耐酸、碱、盐性相对基体分别提高8.6倍,4.4倍,6.2倍,耐蚀性优于纯硅酸盐矿物涂层。     

锌粉粒度对锌铬膜耐腐蚀性能影响的研究

本文通过湿热试验、盐水浸泡试验、盐雾试验和电化学方法全面评价了锌铬膜的耐腐蚀性能,并与镀锌钝化膜进行比较。研究了锌粉粒度对锌铬膜层耐腐蚀性能的影响,锌粉粒度越小,所得锌铬膜耐腐蚀性能越强。     

New bisphenol novolac epoxy resins for marine primer steel coating applications

Bisphenol derived from reaction of phenol with benzaldehyde was prepared in the presence of sulfuric acid as catalyst. Bisphenol novolacs were synthesized in both melting and solution processes using p-formaldehyde and formalin solution in the presence of oxalic acid catalyst. ¹H NMR analysis shows a high methylene bridge contents using the novolacs synthesized in a melting process. The bisphenol novolac epoxy resin was prepared by reaction with epichlorohydrine in the presence of sodium hydroxide as a catalyst. The prepared novolac epoxy resins were cured with 1,2-amino ethyl piperazine (AEP) as a curing agent. The cured resins were evaluated as organic coating for steel. The mechanical properties of the cured epoxy resins were evaluated by measuring both impact resistance and hardness. The chemical resistances of the cured resins were evaluated through salt spray resistance, hot water immersion, solvent resistance, acid and alkali resistance measurements. The data indicate that the cured epoxy resins have excellent chemical resistances as organic coatings among other cured resins.     

醇溶性无机富锌涂料的研究与应用

醇溶性无机富锌涂料是以硅酸烷基酯为基料,配以锌粉以及其他颜填料、溶剂、助剂等制成。主要介绍了醇溶性无机富锌底漆的防腐机理、配方研究和检测结果,试验证明聚乙烯醇缩丁醛的加入能显著改善漆膜的性能,采用磷铁粉代替部分锌粉后,涂料的防腐蚀性能会有所下降。同时介绍了醇溶性无机富锌涂料的应用领域及使用注意事项。     

Eco‐friendly,acrylic resin‐modified potassium silicate as water‐based vehicle for anticorrosive zinc‐rich primers

Potassium silicate binder of zinc‐rich coating was modified by adding water‐based acrylic resin. Several series of coatings containing 5, 10, and 15 wt % of acrylic and acrylic/styrene binders were added to potassium silicate. The coatings were applied on steel and the corrosion resistance of coatings was evaluated by conventional methods such as electrochemical impedance spectroscopy, corrosion potential, salt spray, and scanning electron microscopy. The results indicated that the modification of silicate binder with acrylic and acrylic/styrene led to shortening the curing time, improved corrosion protection, better dispersion of zinc particles, and enhanced salt spray resistance of resultant coatings. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 40370.     

高性能醇溶性无机富锌涂料的研制

主要研究了无机硅酸锌底漆的制备工艺,并通过调整水解度,使用不同的树脂加以改性。使用各种试验测试手段对涂膜性能进行了分析检测,并讨论了不同制备工艺对涂膜性能的影响,最终得到涂膜的各项性能完全达到车间底漆和长效防腐底漆的要求。