无溶剂环氧防腐涂料的制备和性能研究

开发了一种以腰果酚改性胺为固化剂的无溶剂环氧防腐涂料,介绍了环氧树脂、固化剂、稀释剂以及填料等原料的选择,探讨了环氧树脂与腰果酚改性胺的固化机理,并考察了硅烷偶联剂对涂层防腐性能的影响。检测结果表明,环氧树脂与腰果酚改性胺的固化主要以环氧基与胺基之间的反应为主;硅烷偶联剂可以提高涂层的附着力,有效地增强涂膜的耐水性。     

石墨烯复合环氧树脂涂层的制备及其性能

以腰果酚改性酚醛胺为固化剂,将石墨烯掺杂到环氧树脂(E42)中制备了防腐涂料,并将其涂覆在预处理的基材马口铁上.对复合涂层的表面形貌、固化时间、光泽度、附着力、抗冲击性、硬度、柔韧性和防腐性能进行了测试.结果表明,腰果酚改性酚醛胺固化剂制备的涂层具有优异的力学性能和防腐性能,且随着石墨烯含量(以E42质量为基准,下同)的增加,涂层防腐性能提高.当腰果酚改性酚醛胺含量为25％,石墨烯含量为6％时,制备的涂层的平均厚度为(120±10)μm,硬度可达到2H,附着力达到0级,自腐蚀电流密度为8.482×10–6 A/cm2,腐蚀速率为6.593×10–2 mm/a.     

糠醛丙酮改性环氧树脂体系涂料的配制及性能研究

以糠醛(F)和丙酮(A)作为环氧树脂的活性稀释剂,分别用二乙烯三胺(DETA)、酚醛胺固化剂T-31、改性胺固化剂593等作为环氧树脂固化剂,2,4,6-三(二甲氨基甲基)苯酚(DMP-30)、三乙醇胺(TEOA)、2-乙基-4-甲基咪唑(EMI)等作为环氧树脂的固化促进剂,制备了糠醛丙酮改性环氧树脂体系涂料。考察了糠醛丙酮的配比、固化剂、稀释剂、固化促进剂等对环氧树脂涂料的固化特性和力学性能的影响,确定了各改性环氧树脂涂料最佳的组成体系与配比。实验结果表明:糠醛丙酮的不同配比、不同促进剂或固化剂种类及用量对涂料的固化性能以及力学性能具有显著的影响,改变促进剂或固化剂种类及用量可以调节涂料的初凝时间、力学性能等。     

环氧树脂—有机硅复合改性水性聚氨酯的合成

以异佛尔酮二异氰酸酯、端羟基聚二甲基硅氧烷、聚丙二醇、二羟甲基丙酸、环氧树脂为主要原料,通过异氰酸酯基和羟基的加聚反应合成了环氧树脂-有机硅复合改性水性聚氨酯。利用傅里叶变换红外光谱仪表征了其结构,并研究了环氧树脂用量对固化膜热性能和力学性能的影响,有机硅用量对固化膜耐水性能的影响。结果表明:环氧树脂-有机硅复合改性的水性聚氨酯固化膜的耐水性能和耐热性能提高,力学性能也有改善,附着力保持1级且硬度等级最高可达3 H。     

酰胺-水滑石-环氧树脂防腐涂料的制备及性能

以3,5-二氨基苯甲酸、己二酸和乙二胺为原料制备了适用于环氧树脂的酰胺固化剂,并与用硅烷偶联剂改性过的水滑石一同添加到环氧树脂中,得到酰胺-水滑石-环氧树脂防腐涂层。通过红外光谱仪表征了固化剂的结构,用扫描电镜和相差显微镜分析了水滑石的分散性。考察了固化剂和水滑石含量对涂层力学性能和耐蚀性的影响。当固化剂的质量分数为20.0%,水滑石质量分数为1.5%(均以环氧树脂的质量计)时,涂层的致密性最好,附着力达到21.73MPa,洛氏硬度104HR,在3.5%Na Cl溶液中的耐蚀性最好,浸泡24h后无明显锈蚀。     

潮湿环境下混凝土涂层用环氧树脂/胺体系吸水性及其服役失效机制研究

环氧树脂/胺涂料在混凝土保护涂层中被广泛使用。环氧涂层在潮湿环境下服役,其性能会随着时间推移显著下降,其失效机制报道甚少。选用双酚A型环氧树脂为基体树脂,分别与T31固化剂、810固化剂、593固化剂、651固化剂四种常用的室温固化剂进行固化制备涂层材料。详细研究了四种E51/胺固化物的吸水性、硬度、拉伸强度,以及四个体系涂层与混凝土的附着强度。结果表明:第一,在水中浸泡30d(室温),四种体系固化物的吸水性为0.464%～0.861%,吸水后材料的邵D硬度、拉伸强度和附着强度下降幅度分别为:2.2%～22%、0.66%～62.9%和9.47%～62%;第二,E51与具有长链结构的593固化剂体系的吸水性最大,性能下降最明显;E51与具有多苯环结构的810固化剂体系吸水性最小,相应地性能损失也最小;第三,环氧树脂/胺固化物吸水后性能下降明显,可认为材料吸水是其涂层潮湿环境服役失效的一个原因。     

硅烷单体改性环氧树脂的固化及性能

分别用苯基三甲氧基硅烷(PTMS)和3-缩水甘油醚氧丙基三甲氧基硅烷(KH560)单体对环氧树脂进行了化学改性,通过红外(FT-IR)、核磁(1H NMR)对其化学结构进行了表征。以聚酰胺650为固化剂,用差示扫描量热仪(DSC)研究了固化物的固化动力学。此外还研究了涂膜的热失质量(TGA)、吸水率、附着力等性能。结果表明:苯基三甲氧基硅烷和3-缩水甘油醚氧丙基三甲氧基硅烷接枝上环氧树脂,与纯环氧树脂相比,改性后的树脂具有更好的热稳定性和更低的吸水率。改性环氧树脂固化后形成两面性质不同的涂层,与底材接触的涂层底面保留了环氧树脂原有的附着力,而涂层表面则具有高憎水性,起到防腐等作用。     

PPGDGE对二次固化环氧树脂性能的影响北大核心

采用高温潜伏性固化剂超细双氰胺对环氧树脂E51/改性胺固化剂593体系进行高温二次固化,并用聚丙二醇二缩水甘油醚(PPGDGE)对该体系进行改性。通过力学性能、动态力学分析、形状记忆性能和扫描电子显微镜研究了二次固化和PPGDGE用量对环氧树脂体系的影响。结果表明:二次固化使环氧树脂强度大幅提高,拉伸强度为79.1 MPa,提高了47.9%;PPGDGE的加入使环氧树脂的形状记忆性能大幅提高,当加入9 phr PPGDGE时,冲击强度提高了28.0%,形状回复速率提高了52.8%,形状回复率提高了5.2%。     

PPGDGE对二次固化环氧树脂性能的影响

采用高温潜伏性固化剂超细双氰胺对环氧树脂E51/改性胺固化剂593体系进行高温二次固化,并用聚丙二醇二缩水甘油醚(PPGDGE)对该体系进行改性。通过力学性能、动态力学分析、形状记忆性能和扫描电子显微镜研究了二次固化和PPGDGE用量对环氧树脂体系的影响。结果表明:二次固化使环氧树脂强度大幅提高,拉伸强度为79.1 MPa,提高了47.9%;PPGDGE的加入使环氧树脂的形状记忆性能大幅提高,当加入9 phr PPGDGE时,冲击强度提高了28.0%,形状回复速率提高了52.8%,形状回复率提高了5.2%。     

环氧树脂腰果酚醛胺及腰果酚醛酰胺固化剂的合成及其性能研究

采用曼尼希反应合成了一类新的环氧树脂室温固化剂——腰果酚醛酰胺。重点研究了固化剂的合成机理及其胺值的控制方法。采用傅里叶红外光谱(FT-IR)表征了固化剂的结构。采用差示扫描量热仪(DSC)比较了腰果酚醛胺、腰果酚醛酰胺以及聚酰胺的固化动力学,并揭示了腰果酚醛酰胺的固化机理。分别以合成的腰果酚醛胺和腰果酚醛酰胺固化无溶剂环氧树脂涂料,测定涂层的机械力学性能、热力学性能以及防腐蚀性能,结果表明:相比聚酰胺和腰果酚醛胺固化剂,用腰果酚醛酰胺固化的涂膜具有优异的低温固化性、柔韧性、硬度以及防腐性能。     

固化剂对环氧玻璃鳞片涂层性能的影响

以双酚A环氧树脂(E20)为主要成膜物,层片状玻璃鳞片和云母氧化铁为主要填料,辅助以铝粉、氧化铁红颜料,以及各种助剂和溶剂,再分别加入固化剂脂肪族胺加成物、聚酰胺TY-650,制得高固体分厚浆型环氧玻璃鳞片涂料。通过常规的力学性能(涂层的硬度、耐冲击性、柔韧性、附着力等)和耐腐蚀性测试,对比了不同固化剂对环氧玻璃鳞片涂层性能的影响。研究结果表明,脂肪族胺加成物与环氧树脂交联固化的玻璃鳞片涂层的硬度、附着力以及交流阻抗值都较高,具有良好的综合性能,加入铝粉对基体可起到阴极保护作用。     

Preparation and anticorrosive behavior of epoxy-polysiloxane hybrid coatings modified by polyetheramines

Inorganic/organic hybrid coatings based on epoxy-polysiloxane resin were prepared by using five types of curing agents, including 3-aminopropyltriethoxysilane (APTES) alone (control coating) and the mixtures of four types of polyetheramines (Jeffamine D230, D400, T403, and THF100) along with APTES (modified coatings). The mechanical, adhesion, and corrosion resistance properties of the hybrid coatings cured by different curing agents were studied. The dynamic mechanical thermal analysis results showed that the glass transition temperature and cross-link density of the modified coatings decreased with increasing of the chain length of polyetheramines. The impact resistance height of the modified hybrid coatings was more than one time higher than that of the control coating. The adhesion of the modified hybrid coatings was enhanced compared to the control coating except the coating modified by THF100. Compared with the control coating, comparable hardness and improved wet adhesion were attained for the coatings modified by polyetheramines D230 and T403 with shorter chain length, while the hardness and wet adhesion were decreased for the coatings modified by polyetheramines D400 and THF100 with longer chain length. The corrosion resistance behavior of the hybrid coatings was thoroughly examined by electrochemical impedance spectroscopy and salt spray tests. It was found that the corrosion resistance behavior of the hybrid coatings increased with D230 and T403 due to higher cross-link density and decreased with D400 and THF100 due to lower cross-link density.     

Investigation of the size effect of mica sheets on the anticorrosion behavior of UV-cured coatings

In this article, four different grades of mica sheets were used to investigate the influence of the size of mica sheet on the UV-curing process and the anticorrosion performance of UV-cured coatings. The dispersion of mica sheets in coating matrix was explored by viscosity and morphology measurements. The curing behavior of the composite coatings was studied by gel content and double bond conversion rate. The dispersing behavior of the mica sheets with different grades was investigated by SEM image and rheology measurement. And the anticorrosive performance of the UV-cured composite coatings was studied by electrochemical measurements and neutral salt spray tests. It was found that the curing degree of the UV-cured coating was not affected with incorporation of mica sheet as well as its size. Mica sheets with medium size (10 μm) could be more efficiently dispersed in UV-cured coating than other grades, which helps to form a denser filler pathway and suppresses the diffusion of corrosive agents into the coating matrix, leading to the lowest water adsorption and best anticorrosion performance. After 45 days of immersion in NaCl solution, the impedance modulus of the UV-cured composite coating with 10 μm mica sheets did not decrease and still maintained at the initial impedance value. After 1500 h's salt spray test, the corresponding coating remained intact without bubbling, peeling, corrosion, and other defects, whereas the coating with other grades of mica sheets all exhibited corrosion pits and blisters, demonstrating that the size of mica sheet played an important role in enhancing the anticorrosion performance of UV-cured coatings.     

水性环氧树脂应用性能研究

采用巴陵石化的自乳化性中分子质量水性环氧乳液CYDW-112W50及液体双酚A型环氧树脂CYDW-100与4种胺固化剂配制成4种水性体系,通过对涂膜物理、力学和耐腐蚀性的测试研究了不同固化体系和不同环氧与胺氢的配比对水性体系性能的影响。结果表明:离子型水性环氧体系硬度最高,附着力等比较优异,适合用于底涂或中涂;乳液型水性环氧体系柔韧性能较好,适合用于中涂和面涂;胺氢与环氧基团物质的量比为1.0～1.1∶1时,固化物综合性能最优,据此提出了防腐涂料及改性混凝土的参考配方,产品经性能测试达到使用要求。     

Crosslinked main-chain-type polybenzoxazine coatings for corrosion protection of mild steel

Bisphenol A/diaminodiphenylmethane (BA-ddm)-based polybenzoxazine precursor was synthesized from 4,4′-diaminodiphenylmethane, bisphenol A, and paraformaldehyde. The curing behavior of BA-ddm was studied by using differential scanning calorimeter and Fourier transform infrared spectrometer techniques. To verify the anticorrosion property, cured polybenzoxazine (PBA-ddm) coatings were prepared on mild steel (MS) through dip-coating and thermal curing methods. The surface properties of cured PBA-ddm coatings were characterized by microscopy and contact angle measurement. The electrochemical measurements were carried out to investigate the corrosion properties of PBA-ddm-coated MS. The results showed that PBA-ddm-coated MS samples exhibited high anticorrosive performance with the corrosion current reduced by two orders of magnitude than that of pristine MS.     

室温固化钢结构防护用氟碳涂料的研制

氟碳涂料性能优越,涂层具有长效防腐性和耐候性,可广泛用于钢结构和桥梁等防腐蚀工程中,介绍了钢结构防护用的室温固化氟碳涂料研制工艺及应用情况。     

X80钢管防腐环氧粉末涂层技术的研究

重点阐述采用自主合成的Amanda979系列固化剂,优选环氧树脂辅助填料、助剂等材料,制成X80钢管防腐环氧粉末涂料。试验结果表明:X80钢管防腐环氧粉末涂料180～185℃能在2～3min快速固化、具有卓越的附着力、耐高温阴极剥离(经过1.5V/65℃的阴极剥离试验30d,阴极剥离半径为<10mm),符合新的FBE管道防腐涂层(简称HCD-FBE)技术要求。     

Novel isocyanate-free self-curable cathodically depositable epoxy coatings: Influence of epoxy groups on coating properties

Novel self-curable cathodically depositable coatings were developed from glycidyl functional epoxy ester-acrylic graft co-polymer (EEAG) without using any external crosslinking agents. The EEAG-amine adducts (EEAGAs) were prepared by reacting EEAG with varying amount of diethanolamine (DEoA) which are neutralized with acid and dispersed in deionised water to give stable dispersion for cathodic electrodeposition (CED) coatings. The dispersions were cathodically electrodeposited on phosphated steel panels and thermally cured to give uniform coating. The coatings were evaluated for different mechanical, chemical and corrosion resistance properties. The coatings were evaluated for their thermal properties using thermo gravimetric analysis (TGA). The final properties of the coatings were found to be affected by the amount of amine reacted with epoxy. The coating films showed good overall performance properties for their use in coating industry.     

新型改性脂肪胺固化剂的合成及其在定向钻穿管道外防腐涂层中的耐腐蚀性能研究

合成了一种新型的改性脂肪胺固化剂,并以此制备了定向钻穿管道用无溶剂防腐涂料。该固化剂赋予涂层优良的耐腐蚀性,可满足定向钻穿管道外防腐层的性能要求。采用电化学交流阻抗对该涂层的耐腐蚀性进行了评价,并测试了其耐盐雾性。     

酚醛环氧防腐涂料用固化体系研究进展

综述了近年来国内外酚醛环氧防腐涂料用固化体系的研究现状和进展,包括苯酚-甲醛、双酚A-甲醛树脂和腰果酚-苯酚-甲醛树脂等酚醛树脂固化体系,苯酚-甲醛、双酚A-甲醛改性胺和腰果酚缩醛胺固化体系及其他固化体系。认为腰果酚改性胺固化剂是一种性能优异的环氧树脂固化剂,它对开发新型高性能、多用途、低成本和环保型的重防腐环氧树脂涂料固化技术提供了新思路。