水性环氧防腐涂料的研制

以自制的环氧树脂乳状液为漆基、磷酸锌作为活性防锈颜料合成了水性环氧防腐涂料。研究了涂料中颜基比、固化剂与环氧树脂的当量比等对涂膜性能的影响。结果表明,颜基比小于1,固化剂CEN-537与环氧树脂E-44的当量比为1或稍大于1时,所得涂膜的各项性能指标可达到较好的平衡;涂料的防绣性能与以硅铬酸铅为防绣颜料的传统涂料相当。新研制的水性环氧防腐涂料性能达到了国外同类产品的水平。     

高性能环氧树脂涂料固化剂

通过对几种常用环氧树脂常温固化剂性能的比较和应用结果表明,以天然腰果壳油合成的长链的取代酚醛胺固化剂,具有优异的综合防护性能,是环氧树脂高性能化的一种途径。     

Novel water-borne amine hardeners for ambient curing epoxy coatings

Conclusions  Two new amine adduct hardeners with the following features are introduced:

改性脂环胺固化剂的合成与性能

固化剂对环氧树脂的性能有着决定性的影响。合成了一种改性脂环胺类环氧树脂固化剂,探讨了合成工艺条件与固化剂性能的关系。合成的固化剂用于配制环氧树脂建筑结构胶,胶粘剂的综合性能良好,能满足GB50367—2006《混凝土结构加固设计规范》对结构胶的要求。     

环氧树脂固化剂用聚醚胺的研究进展

介绍了聚醚胺在环氧树脂固化剂领域的应用现状,综述了聚醚胺的5种合成方法(氨解法、离去基团法、氨基丁烯酸酯法、聚醚腈烷基化法和Simons法)的国内外研究进展。     

改性胺固化剂对防腐涂料的影响

利用缩水甘油醚和二乙烯三胺制得端氨基环氧-胺加成物作为固化剂,采用扫描电镜探讨了不同类型固化剂对涂层乳液粒径、表观形貌的影响;利用交流阻抗技术研究了不同固化剂对涂层耐蚀性的影响。结果表明:共混封端的固化剂的乳化性能较好,乳液的平均粒径较小,其制备的涂层耐蚀性最好。     

改性胺类环氧固化剂的研制

介绍了由苯基苯酚生产中的副产物杂酚为原料,制备酚醛改性胺类环氧固化剂的合成工艺,产品分析,实际应用情况等。     

水性环氧固化剂分散体的制备及改性

采用不同分子量的聚乙二醇与液体环氧树脂EPON828合成反应型乳化剂,然后将反应型乳化剂链段引入到以液体环氧树脂EPON828与间苯二甲胺为原料合成的端胺基中间体的分子结构中,再用活性稀释剂进行封端,最后加水分散,制得水性环氧固化剂分散体。采用了γ-氨丙基三乙氧基硅烷(即硅烷偶联剂KH-550)对其进行改性。确定了间苯二甲胺与环氧树脂EPON828的摩尔比为2.2∶1,聚乙二醇6000与环氧树脂EPON828(摩尔比为1∶1)制备的反应型乳化剂用量为9%,硅烷偶联剂KH-550的用量为固化剂分散体的质量的2%时,所制备的水性环氧固化剂分散体稳定性最佳,其粒径为750.8nm,固含量约60%,胺值为118mgKOH/g,黏度为4500mPa·s。室温固化后,涂膜硬度为3H,光泽度(60°)为108%,冲击强度50kg·cm,柔韧性1mm,附着力1级,耐酸碱腐蚀性能好。通过傅立叶变换红外光谱表征了反应产物。     

酚醛改性脂肪胺环氧树脂固化剂的性能研究

用酚醛改性脂肪胺(乙二胺、二乙烯三胺)与聚醚胺作为混合固化剂固化环氧树脂,研究了聚醚胺的用量对环氧树脂凝胶时间、冲击韧性以及粘接性能的影响;并通过测试钢-钢拉剪强度研究了此结构胶粘剂的耐湿热老化性能。实验结果表明,随着聚醚胺用量的增加,环氧树脂固化体系的凝胶时间增长,树脂浇铸体的冲击韧性明显提高,粘接强度先提高再降低,最高值达到16.2 MPa;随着湿热老化时间的增加,环氧树脂固化体系的粘接性能逐渐降低。     

氧化石墨烯-水性环氧树脂固化剂的制备及性能

以三乙烯四胺（TETA）,氧化石墨烯（GO）,环氧树脂E44、三羟甲基丙烷三缩水甘油醚（TPEG）、甲基聚氧乙烯环氧基醚（MEH）和γ-(2,3-环氧丙氧)丙基三甲氧基硅烷（KH560）为原料,采用原位聚合法首先将TETA与GO球磨分散,使TETA与GO通过共价键相连,然后依次滴加E44、TPEG、MEH和KH560合成氧化石墨烯-水性环氧树脂固化剂（TGO-WPEA）,再与环氧树脂乳液（Epikote-6520）复合制得氧化石墨烯改性水性环氧树脂防腐涂料（TGO-EP）。通过FTIR、XPS和XRD对纳米材料进行结构表征,采用电化学测试和盐雾实验对复合涂层TGO-EP的防腐性能进行了研究。结果表明,固化剂分子通过共价键连接到GO表面,改善了GO在环氧树脂中的分散稳定性和接枝率,提高了TGO-EP复合涂料对腐蚀介质的屏蔽性能。与EP涂层相比,其腐蚀电位从-0.267mV提高到-0.125mV,腐蚀电流密度从5.44×10-8减小到1.09×10-8 A/cm2;EIS测试表明,浸泡20d后,TGO-EP仍具有最高的低频阻抗。     

一种新型改性胺固化剂的研制

用多元胺和缩水甘油醚、丙烯腈等进行改性反应,获得一种高性能改性胺固化剂。     

腰果酚改性胺环氧树脂固化剂的制备研究

以腰果酚、甲醛(F)和三乙烯四胺(TETA)为主要原料,采用缩聚法合成了PCT(腰果酚改性三乙烯四胺)固化剂。以n(腰果酚)∶n(TETA)、n(腰果酚)∶n(F)、反应温度和反应时间为试验因素,以合成产物的胺值为考核指标,采用正交试验法和单因素试验法优选出制备PCT固化剂的最优方案。研究结果表明:当n(腰果酚)∶n(F)∶n(TETA)=1∶0.8∶1.4、反应温度为90℃和反应时间为100 min时,合成的PCT固化剂具有较低的黏度和适中的胺值。     

Effect of molecular weight of phenalkamines on the curing,mechanical, thermal and anticorrosive properties of epoxy based coatings

The present investigation deals with the study of effect of molecular weight and structures of phenalkamine curing agents on the curing, mechanical, thermal and anticorrosive properties of epoxy based coatings. The phenalkamines were prepared by varying the composition of formaldehyde and diamine in the formulation. The structural characterization confirmed successful preparation of high molecular weight phenalkamines. These were then used as curing agents for air drying and thermally curable epoxy coatings. The effect of these phenalkamines on curing properties of epoxy resin as well as mechanical, chemical, thermal and dynamic thermo-mechanical properties of the resultant coatings was studied and compared with commercial phenalkamine. The anticorrosive properties of the coatings were evaluated by salt spray test and electrochemical impedance spectroscopy. The study revealed that high molecular weight phenalkamines resulted in faster surface drying due to rapid molecular weight build-up. The anticorrosive performance also improved as indicated by higher modulus and electrochemical potential values.     

水下环氧树脂用固化剂的制备

以混合多元胺(1,6-己二胺和三乙烯四胺)、混合酚(苯酚、壬基酚和间甲酚)和多聚甲醛为主要原料,采用Mannich反应制备出一种水下EP(环氧树脂)用新型酚醛胺固化剂,并采用正交试验法优选出制备该固化剂的最佳工艺条件。研究结果表明:当n(苯酚)∶n(壬基酚)=1.5∶1、n(间甲酚)∶n(壬基酚)=1.5∶1、n(混合酚)∶n(多聚甲醛)=0.7∶1、n(多聚甲醛)=0.3 mol、n(1,6-己二胺)∶n(三乙烯四胺)=1.0∶1、n(混合胺)∶n(多聚甲醛)=1.6∶1、反应时间为3.0 h和反应温度为80℃时,制成的固化剂用于水下EP胶粘剂时,其在潮湿环境施胶后立即在水中固化24 h,相应胶接件的湿态剪切强度为7.2⁷.6 MPa;当w(固化剂)=40%(相对于EP质量而言)时,室温EP浇铸体的拉伸强度、断裂伸长率、弯曲强度和冲击强度分别为57 MPa、12.6%、116 MPa和15.6 kJ/m2。     

环氧粉末涂料低温固化剂的合成及应用

以4,4-二苯基甲烷二异氰酸酯(MD I)和3-二甲基氨基丙胺为原料,合成了一种有机脲类低温固化剂二苯基甲烷-4,4-二[N,N-二甲氨基丙脲],并改进了粉末涂料的生产工艺,使环氧粉末涂料在低温下实现完全固化。环氧粉末涂料中加入11%有机脲类固化剂,可以在130℃8 min和140℃4 min的条件下实现完全固化,使粉末涂料应用于塑料制品、纸张、纸板及木材等热敏性基材的表面涂膜成为可能。     

聚醚胺对环氧树脂高低温粘接性能的影响

采用间苯二甲胺和聚醚胺作为混合固化剂，研究了柔性链增韧和不同官能度环氧的“混合效应”的协同作用对环氧胶粘剂的低温(-196℃)、室温和高温(140℃)粘接性能的影响。研究结果显示，以间苯二甲胺为固化剂时，AG80的引入可以改善双酚A环氧的高温及低温（-196℃)的粘接强度，并在质量分数为50％时使低温粘接性能达到最佳值。聚醚链段的引入有利于胶粘剂低温和室温粘接强度的改善，但高温性能降低。而在柔性链改性体系中AG80的加入可改善高温粘接性能，但室温及低温剪切强度略有降低。     

High performance waterborne coatings based on dispersions of a solid epoxy resin and an amine-functional curing agent

A novel, waterborne epoxy system comprised of non-ionic stabilized dispersions of a solid epoxy resin and an amine curing agent has been designed for ambient-cure coatings. The performance characteristics of coatings formulated from the new system have been compared to a standard system. The new system produced formulated coatings with robust performance over a wide range of amine-to-epoxy stoichiometries (65 to 130%). At 100% stoichiometry, the new system was found to have lower VOC, faster hardness development, better gloss, and higher impact resistance than the standard system. The new formulations also exhibited superior water and salt spray resistance, and a definitive viscosity rise at the end of potlife. Unlike the standard system, coating morphology of the new waterborne system was found to be similar to a solvent-based coating. For the new system, good coalescing solvents, as judged by gloss and gloss potlife, were found to have low solubility parameters and high boiling points. Presented at the 76th Annual Meeting of the Federation of Societies for Coatings Technology, on October 15, 1998, in New Orleans, LA. P.O. Box 1380, Houston, TX 77251-1380.     

环氧树脂涂料用脂肪族二胺加成物固化剂

介绍了一类性能独特的脂肪族和脂环族二胺加成物环氧固化剂,其毒性低、气味小。用其制备的涂料具有良好的耐化学腐蚀性、高硬度和良好的光泽性。     

Development of amine–acid cured Annona squamosa oil epoxy anticorrosive polymeric coatings

Forecasts for exhaustion of depleting petroleum resources in the years to come and escalating prices of petro-based chemicals, advocate the utilization of monomers/polymers derived from sustainable resources as an alternative. Oils of certain seeds may hold considerable promise as a source of unsaturated hydrocarbon, an excellent starting material for epoxidation and subsequent polymer production. Seeds of Annona squamosa (oil content 42–45%), go as a natural waste. Oil obtained from these seeds contains good amount of unsaturation; however, it has not been reported to be epoxidised, yet. Thus, epoxidation of A. squamosa oil (AOE) has been carried out in our effort to utilize a sustainable resource through the development of an anticorrosive coating material. AOE was further cured with different curing agent systems (ethylenediamine/phthalic acid (EDA–PA), 1,3-propanediamine/phthalic acid (PDA–PA), ethylenediamine/adipic acid (EDA–AA), 1,3-propanediamine/adipic acid (PDA–AA), p-phenylenediamine/adipic acid (PhDA–AA). AOE and AOE curing agent systems were subjected to structural elucidation by spectroscopic techniques (IR and ¹H NMR) and physico-chemical characterization (refractive index, specific gravity, iodine value, saponification value, hydroxyl value) involving standard methods. Thermal stability of these resins was investigated by thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Coatings of oil epoxy curing agent combinations prepared on Fe- and Al-alloys (mild steel and aluminium-24345) were subjected to physico-mechanical and anticorrosive tests in various corrosive media (water, saline water, acid and alkali) along with abrasion and steam resistance, light fastness, water vapour transmission, gloss, salt fog and humidity tests. These systems apprise satisfactory performance under different corrosive environments. The approach offers an alternate way for resource utilization and overcomes the drawbacks (poor load-bearing capacity and hardness) of oil epoxy-based coatings.     

油脂基聚氨酯改性脂肪胺水性环氧固化剂的合成及性能

以高级脂肪醇聚氧乙烯醚（OE-6）、甲苯二异氰酸酯（TDI）为原料,物料比n(TDI)∶n(OE-6)= 1.05∶1、温度45℃、反应2.5 h合成了端异氰酸酯预聚体,再将其与多元胺按照摩尔比n (多元胺)∶n (预聚体)=1.2∶1、温度40℃、反应3 h扩链,得到油脂基聚氨酯改性脂肪胺水性环氧固化剂（UFAWECAOF）。用红外光谱、 13C-NMR表征了UFAWECAOF的结构。粒径分析表明目标产物具有乳化液体环氧树脂的功能,其与环氧树脂EPON828复配制备的双组分水性涂料涂膜固化物,柔韧性达1 mm、铅笔硬度达3 H、耐冲击性达50 kg/cm。