氟硅改性丙烯酸酯树脂防冰涂料研究

本文利用含氟丙烯酸酯单体和含硅丙烯酸单体,对成膜性很好的丙烯酸酯树脂进行改性,从而在聚合物分子中引入有机硅链段和有机氟链段,降低涂膜的表面能,合成一种表面能低、憎水性强、耐久耐候性好的氟硅改性丙烯酸酯树脂防冰涂料。     

国内硅氟树脂涂料的研究新进展

简单介绍了硅氟树脂涂料的合成方法,综述了国内硅氟树脂在丙烯酸酯类涂料中的应用新进展,并且指出了硅氟树脂涂料的发展方向。     

氟硅改性丙烯酸树脂合成技术及应用现状

氟硅改性丙烯酸树脂因其具有优越的耐候性、自清洁性和优良的漆膜综合性能,被广泛应用于涂料产品做主要成膜物。本文对氟硅改性丙烯酸树脂及在涂料中的合成技术和应用进行了综述,并对氟硅改性丙烯酸树脂的发展进行了展望。     

涂料文摘

水性光固化聚氨酯改性环氧丙烯酸树脂的研究,增强液体调色剂对聚合物基材粘附性的底漆,聚氨酯二（甲基）丙烯酸酯的生产方法,浅析含氟聚氨酯涂料在军用雷达重防腐中的应用,一种氟硅改性核壳结构聚氨酯-丙烯酸酯乳液的制备方法     

有机氟改性丙烯酸酯树脂研究新进展

综述了有机氟改性丙烯酸酯树脂的化学改性制备方法(如常规乳液聚合、核壳乳液聚合和无皂乳液聚合等)及其研究新进展,总结了有机氟改性丙烯酸酯树脂在外墙涂料、防腐防污涂料等领域的应用现状,并展望了该研究领域的发展前景。     

涂料用含氟丙烯酸酯聚合物的研究进展

含氟丙烯酸酯聚合物除具备丙烯酸酯聚合物本身成膜性好等特点外,还表现出氟聚合物的优异性能,如高硬度和低表面能等,在要求特殊性能的涂料领域获得广泛应用.本文简述了有机氟树脂的结构特点和性能,介绍了氟碳树脂的制备改性方法及含氟丙烯酸酯聚合物乳液的研究现状和进展,并对其应用前景进行了展望.     

有机氟改性阴极电泳涂料的制备及性能

以丙烯酸酯类单体和有机氟单体(全氟烷基乙基丙烯酸酯,TEAc-N)为原料,采用溶液聚合的方式制备了阳离子型有机氟改性丙烯酸树脂并用其制成阴极电泳涂料。通过FT-IR、接触角仪、电导率仪等手段对共聚物树脂及其所配漆液与所得漆膜的性能进行表征,探讨了不同有机氟单体的添加量对电泳涂料性能的影响。结果表明:当有机氟单体的添加量(质量分数)为12%时,漆膜接触角达到了107.5°。改性后的阴极电泳涂料漆膜具有优良的耐腐蚀性。     

涂料用有机硅改性丙烯酸树脂的合成与研究

以溶液聚合法合成了有机硅改性丙烯酸树脂，选择不同种类的硅单体进行实验，研究了硅单体用量对涂膜吸水率的影响以及不同软硬丙烯酸类单体比例对涂膜柔韧性及吸水率的影响，并对涂膜进行了红外分析和扫描电镜分析。结果表明：由接枝反应改性的有机硅丙烯酸酯涂料具有优良的性能。     

硅树脂乳液高级外墙涂料

当今 ,世界涂料的发展方向 :一是向水性化发展。其中以丙烯酸系列的乳胶漆占主导地位。二是向高性能方向发展。例如 ,含氟树脂涂料、有机硅涂料(简称硅乳 )、有机硅涂料改性丙烯酸酯树脂涂料 (简称硅丙。系在活性有机硅单体上接枝共聚引入丙烯酸酯高分子链上而成 )。由硅乳 (液 )及硅丙乳液可制得耐候性、耐水性、耐污染性和耐化学优良的高级外墙涂料。上述三种涂料使用期均在十年以上。硅乳液及硅丙乳液性能大大优于目前市场所用的苯丙 (苯乙烯 -丙烯酸酯共聚 )乳液及纯丙 (丙烯酸聚合物 )乳液 :①耐水性 :乳液在玻板上成膜后 ,浸泡于水中…     

硅树脂乳液高级外墙涂料

当今 ,世界涂料的发展方向 :一是向水性化发展。其中以丙烯酸系列的乳胶漆占主导地位。二是向高性能方向发展。例如 ,含氟树脂涂料、有机硅涂料 (简称硅乳 )、有机硅涂料改性丙烯酸酯树脂涂料 (简称硅丙。系在活性有机硅单体上接枝共聚引入丙烯酸酯高分子链上而成 )。由硅乳 (液 )及硅丙乳液可制得耐候性、耐水性、耐污染性和耐化学优良的高级外墙涂料。上述三种涂料使用期均在十年以上。硅乳液及硅丙乳液性能大大优于目前市场所用的苯丙 (苯乙烯 -丙烯酸酯共聚 )乳液及纯丙 (丙烯酸聚合物 )乳液 :①耐水性 :乳液在玻板上成膜后 ,浸泡于水中…     

Synthesis and characterization of nanosized titanium dioxide and silicon dioxide for corrosion resistance applications

We are reporting the preparation and characterization of nano-titanium dioxide and silica. The corrosion resistance performance of these nanopigments in silicone as well as silicone–polypyrrole Interpenetrating Polymer Network has been evaluated by impedance spectroscopy. The capacitance and resistance exerted by this nanocomposite coating were compared with the microcomposite coating and found that the nanocomposite coatings has the resistance in the order of 10⁸ Ω cm² in 3% sodium chloride solution, which is more than the microcomposite coating. The comparison of heat resistance performance of these composite coatings indicates that nanocomposite coatings exhibit higher heat resistance property than the microcomposite coatings.     

水性建筑涂料不同性状涂膜耐沾污性研究

选取不同水性建筑涂料对其耐沾污性进行研究。结果表明,涂膜的粗糙度、吸水率、硬度、静水接触角对涂膜的耐沾污性有重要影响,并简要分析了涂膜耐沾污的原理,为耐沾污水性涂料的研制开发提供科学依据。     

Effect of titania particles preparation on the properties of Ni–TiO2 electrodeposited composite coatings

In this paper, the effect of titania particles preparation on the properties of Ni–TiO₂ electrocomposite coatings has been addressed. Titania particles were prepared by precipitation method using titanium tetrachloride as the precursor. The titanyl hydroxide precipitate was subjected to two different calcinations temperatures (400 and 900 °C) to obtain anatase and rutile titania particles. These particles along with commercial anatase titania particles were separately dispersed in nickel sulfamate bath and electrodeposited under identical electroplating conditions to obtain composite coatings. The electrodeposited coatings were evaluated for their microhardness, wettability, corrosion resistance, and tribological behavior. The variation of microhardness with current density exhibited a similar trend for all the three composite coatings. The composite coating containing anatase titania particles exhibited higher microhardness and improved wear resistance. However, the corrosion resistance of the composite coating containing commercial titania powder was superior to that of plain nickel, Ni–TiO₂ composite coatings containing anatase and rutile titania particles. The poor corrosion resistance of these composite coatings was attributed to the higher surface roughness of the coatings. This problem was alleviated by incorporating ball-milled titania powders. The composite coatings with higher surface roughness were modified with a low surface energy material like fluoroalkyl silane to impart hydrophobic and superhydrophobic properties to the coatings. Among these coatings, Ni–TiO₂–9C coating exhibited the highest water contact angle of 157°.     

化学镀Ni-P合金工艺的优化

用五种化学镀工艺制备了Ni-P合金镀层。用动电位极化曲线法比较镀层的耐均匀腐蚀性能,用溶液浇浸法测定了镀层的耐孔蚀性能,并用X-射线衍射仪和扫描电子显微镜分别研究镀层结构和表面形貌。结果表明：工艺2制备的镀层具有较高的耐均匀腐蚀和耐孔蚀性能,属于非晶和微晶组成的混晶结构。并对该工艺进行了正交试验,得到了最优工艺条件。     

Evaluation of the corrosion resistance of phosphate coatings obtained by anodic electrochemical treatment

The corrosion resistance of phosphate coating obtained by anodic electrochemical treatment at 4–6 mA/cm² is addressed in this paper. The corrosion performance of these coatings is also compared with the coatings obtained by chemical treatment. The regenerated phosphoric acid under the influence of anodic current causes a large variation in morphological features of the coatings. Immersion and salt spray tests indicate the ability of these coatings to act as a barrier film on mild steel. Polarization and electrochemical impedance spectroscopic (EIS) studies indicate that the corrosion resistance of phosphate coatings obtained by anodic treatment decreases with increase in current density employed for deposition. In spite of their higher coating weight, the corrosion resistance of phosphate coatings obtained by anodic treatment is inferior to those obtained by chemical treatment. The porosity or discontinuities created due to the dissolution of the coating under the influence of anodic current are considered responsible for the inferior corrosion resistance of these coatings. The study concludes that anodic treatment has only a limited scope for preparing phosphate coatings with improved corrosion resistance.     

Use of electrochemical noise method to investigate the anti-corrosive properties of a set of compliant coatings

This particular study has the aim of developing a new set of reduced VOC (also known as compliant) coatings. The reasoning for this is linked with the mass reduction scheme (MRS) and the requirement for environmentally friendly coatings. To this end a comparison needs to be made between these products and the higher solvent products which it is hoped that they will replace. Accelerated tests are required to get results in reasonably short times. Previous work has established the electrochemical noise method (ENM) as a useful technique for investigating the corrosion resistance of intact organic coatings on steel substrates. To date the most useful parameter obtained has been resistance noise (R_n) and results have shown that coatings that effectively protect the metal substrate demonstrate considerably higher R_n values and these remain high with time. In this work ENM has been used to monitor intact coatings under immersion conditions. Results will be given and compared with standard “salt spray” testing. The immersion test has also had a temperature cycle incorporated and this latter modification makes it effective at separating coatings within an even shorter time. The results so far look very promising and this test regime is helping the company to formulate the lower solvent replacements to be as effective from the anti-corrosion angle as the coatings which they will replace.     

聚四氟乙烯改性环氧阴极电泳涂料的研究

通过向环氧电泳涂料中添加不同含量的PTFE乳液，制备了新型低表面能阴极电泳涂料。对混合体系的工艺条件进行了探索，研究了槽液pH值对漆膜性能的影响。IR谱图说明PTFE乳液粒子能与环氧树脂粒子复合电沉积到基材上。水接触角测定结果表明，在环氧阴极电泳涂料中添加PTFE乳液后，电沉积涂层具有低的表面能，TG说明改性后漆膜的耐热性提高。SEM观察涂层发现漆膜表面平整性下降：研究发现，pH值越低，漆膜水接触角越大，漆膜耐热性越好。     

Wear resistance of chromium oxide nanostructured coatings

Nanostructured plasma-sprayed chromium oxide ceramic coatings, with a higher wear resistance than coatings obtained using micrometric powder as starting material have been developed. The influence of the starting powder, i.e. Cr₂O₃ fused crushed powders and Cr₂O₃ nanopowders having grains size of 100 nm, has been investigated. The nanopowders are reconstituted into spherical micrometer sized granules by the spray-drying process before plasma spraying. It is shown that due to their specific microstructure the wear resistance of the nanostructured coatings is more than 20 times higher compared to the coatings obtained using micrometric powder.     

Elimination of Defects on Glass-Enamel Coating Using Laser Radiation

Glass-enamel coatings with pinhole defects repaired using pulse laser radiation are analyzed. It is demonstrated that thermal resistance and acid resistance of repaired coatings are no less than those of coatings without defects, whereas microhardness of coating in a repaired zone is higher than that of the base.     

Structure and properties of electrodeposited silver–bismuth alloys

The elemental and phase compositions, the deposition rate, the structure, and some physico-mechanical properties, such as hardness, wear resistance, roughness and internal stress of electrodeposited coatings of silver–bismuth alloy have been studied. The possibility of deposition of alloy coatings of desired composition depending on the electrolysis conditions and on the composition of the electrolyte used has been demonstrated. With increase in the Bi content in the coatings, hardness and wear resistance decrease, and at Bi contents higher than 50 wt.% the wear resistance remains unchanged. The roughness of the coatings is independent of their Bi content. The alloy coatings reveal a negative (compressive) internal stress. They consist of two phases and are heterogeneous both in the bulk and in the surface layer. A clearly expressed columnar structure is observed, the columns being of different phase composition. This structure is sometimes accompanied by a lamellar structure. The simultaneous deposition of phases with different Bi content leads to self-organization phenomena and formation of wave, spiral and target structures on the electrode surface.