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利用聚醚二元醇、二环己基甲烷 -4,4'-二异氰酸酯( HMDI)合成— NCO封端的聚氨酯预聚体,再与环氧树脂(E-44)反应生成聚氨酯改性环氧树脂,聚醚二元醇、 HMDI与环氧树脂 E-44的物质的量比为 1∶2∶2。以聚氨酯改性环氧树脂为主体,用一乙醇胺( MEA)和二乙醇胺( DEA)对树脂进行环氧开环,封闭型异氰酸酯为固化剂,用乳酸进行酸化中和,加入去离子水乳化得到阴极电泳涂料。结果表明: n(MEA)∶n(DEA)∶n(聚氨酯改性环氧树脂) =4∶4∶3,固化剂用量为 21%,中和度 65%,并加入去离子水可调节成固体分为 12%的稳定阴极电泳涂料,涂料乳白并伴有蓝相。最后在工件上进行电泳涂装,得到表面光滑平整、硬度 3H、耐冲击性 50 cm、耐盐雾 500 h、柔韧性 1 mm、附着力 1级
的阴极电泳漆膜。 相似文献
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以脱水蓖麻油酸酯化改性的环氧树脂为主链,聚氨酯预聚物为交联剂,选择适当的合成工艺和助剂,制备出漆液稳定、漆膜性能好、固化温度较低的蓖麻油酸改性的环氧一聚氨酯阴极电泳涂料。考察了酯化程度、胺开环率、酯化温度及工艺顺序等对树脂反应的影响。 相似文献
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蓖麻油酸改性的环氧-聚氨酯阴极电泳涂料的研制 总被引:1,自引:0,他引:1
以脱水蓖麻油酸酯化改性的环氧树脂为主链,聚氨酯预聚物为交联剂,选择适当的合成工艺和助剂,制备出漆液稳定、漆膜性能好、固化温度较低的蓖麻油酸改性的环氧-聚氨酯阴极电泳涂料.考察了酯化程度、胺开环率、酯化温度及工艺顺序等对树脂反应的影响. 相似文献
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有机氟改性环氧丙烯酸阴极电泳涂料的研究 总被引:1,自引:0,他引:1
选择合适的丙烯酸类单体、有机氟单体与环氧树脂接枝共聚合成了用于阴极电泳涂料的阳离子型含氟环氧丙烯酸树脂.探讨了氟单体的用量、接枝反应温度、胺化温度、胺化时间等对树脂反应的影响,并对所得阴极电泳涂料的性能进行了测试.结果表明:在合适的电泳工艺参数下,所得漆膜与不含氟的环氧丙烯酸漆膜相比,其耐盐水性、耐老化性、冲击强度都有所提高. 相似文献
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有机硅改性环氧树脂涂料是目前应用比较广的一种耐高温涂料。本研究选用乙氧基封端的有机硅低聚体对环氧树脂进行改性,用酚醛树脂作体系的固化剂,详细对比了改性树脂及涂料制备中时间、温度及用料比例对涂膜性能的影响,制备了一种兼有有机硅、环氧和酚醛树脂优点的可耐500℃以上的高温涂料。 相似文献
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纳米二氧化硅改性有机硅-环氧防腐涂料的合成与性能研究 总被引:1,自引:0,他引:1
本文利用带羟基的有机硅预聚体与双酚A型环氧树脂反应,制备有机硅-环氧树脂及涂层,并采用纳米SiO2改性有机硅-环氧.采用扫描电镜、硬度、冲击强度、附着力、柔韧性、电化学防腐特性等分析手段,考察了有机硅用量变化、纳米SiO2等对涂膜性能的影响,发现当环氧树脂有机硅用量比为2:1时,有机硅改性环氧涂层综合了有机硅树脂和环氧... 相似文献
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Ayman M. Atta M.I. Abdou Abdel-Atif A. Elsayed Mohamed E. Ragab 《Progress in Organic Coatings》2008,63(4):372-376
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. 相似文献
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环氧改性含磷苯丙防锈乳液的合成 总被引:3,自引:0,他引:3
采用常规乳液聚合方法,以环氧树脂改性含有磷酸酯功能单体的苯丙乳液来制备水性防锈乳液。苯乙烯(St)、丙烯酸丁酯(BA)等为共聚单体,引入环氧树脂及具有抗闪蚀功能的磷酸酯功能单体,考察了乳化剂、引发剂、环氧树脂、磷酸酯单体不同用量对乳液及其漆膜的影响,并对乳液的粒径、固含量及漆膜的耐盐水性、附着力等性能进行测试,逐步优化聚合工艺来合成具有高效防锈的新型环氧防锈乳液。研究表明,乳化剂用量、引发剂用量、环氧树脂用量、磷酸酯单体用量分别为单体总量的1.5%、0.6%、7%、3%时,可制得性能较好的水性环氧改性含磷苯丙防锈乳液。 相似文献
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以丙烯酸酯类为主要单体,环氧树脂和有机硅大分子乳液为改性剂,R303为主要乳化剂,通过乳液聚合方法合成了耐指纹涂料用聚合物乳液成膜物,讨论了乳化剂、环氧树脂和有机硅对乳液及涂膜性能的影响。结果表明,采用阳/非离子复合乳化体系可以制得酸性环境下使用的聚合物乳液,涂膜烘烤过程中活泼的环氧基团与其它基团的交联会大幅度提高涂膜的耐腐蚀性和硬度,有机硅参与聚和后会进一步改善涂层的耐水耐腐蚀性,当m(R303)∶m(OP-10)为3∶1,E-51质量分数为10%,乙烯基有机硅乳液质量分数为5%时,合成的乳液成膜物有较好的综合性能。 相似文献
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Rossana Grilli Marie Laure Abel Mark A. Baker Barrie Dunn John F. Watts 《International Journal of Adhesion and Adhesives》2011,31(7):687-694
A thermodynamic study of the adsorption of an epoxy acrylate resin used for UV-cured coatings on two different anticorrosion pretreatments on aluminium alloys relevant to aerospace industry has been undertaken. Aluminium alloy Al2219 specimens, treated with an inorganic chromate based conversion coating (Alodine 1200S) and an organic titanium based conversion coating (Nabutan STI/310), were immersed in solutions of different concentrations of the resin and adsorption isotherms were determined by assessing the uptake of the adsorbate, as a function of solution concentration, by time-of-flight secondary ion mass spectrometry (ToF-SIMS). The results show different behaviour for the two substrates, which can be attributed to the organic component of the titanium based coating. In the case of the inorganic conversion coating a clear plateau is achieved at relatively low concentrations and at a lower level of adsorption than for the hybrid coating. The data for both the coatings conform well to the Langmuir model, the organic coating, as well as showing a higher level of adsorption of the resin, also presents oscillatory behaviour at low concentration, which is shown to be complementary to the behaviour of the reactive diluent included with the epoxy acrylate to aid processing. A discussion of this competitive adsorption of the epoxy resin and the diluent on the different substrates is presented, based on considerations of the chemistry of the systems under investigation. 相似文献