改性聚硅氧烷面漆的发展现状

介绍了改性聚硅氧烷面漆的特点、基本组成,并分别论述了环氧改性聚硅氧烷面漆、丙烯酸改性聚硅氧烷面漆和聚丙烯酸酯改性硅氧烷面漆的技术特点和发展。总结了改性聚硅氧烷面漆的配套体系并与氟碳面漆和双组分丙烯酸面漆作性能上的对比。展望了改性聚硅氧烷面漆的技术发展方向。     

海洋大气下钢结构保护涂层面漆老化性能分析

概述了海洋大气环境下钢结构保护涂层高耐久性面漆的现状及发展趋势,主要对双组分丙烯酸聚氯酯面漆、双组分氟碳面漆和丙烯酸改性聚硅氧烷面漆的老化性能进行了比较和评价。     

太阳能反射镜镜背保护涂料的应用研究

以灰色环氧磷酸锌防腐涂料为底漆、丙烯酸改性聚硅氧烷涂料或丙烯酸聚氨酯涂料为面漆,作为太阳能反射镜镜背保护涂料,对保护涂料的施工工艺以及2种面漆的防护性能等进行了研究,研究表明:丙烯酸改性聚硅氧烷涂料配套体系的附着力、反射率、中性盐雾、CASS喷雾试验、人工加速老化、湿热试验及抗气候循环试验等各项性能指标达到了相应的技术标准,较传统的丙烯酸聚氨酯面漆在恶劣环境中更适合太阳能反射镜的保护。     

持久的外观装饰性:高性能防腐面漆的回顾

现代钢结构建筑的腐蚀防护问题,已经基本得到解决,钢结构建筑的外观装饰性显得越发重要起来。探讨了传统使用的醇酸面漆、氯化橡胶面漆、丙烯酸面漆、环氧面漆、丙烯酸聚氨酯面漆的应用,并且介绍了目前日益受到关注的含氟聚合物面漆和聚硅氧烷涂料的应用。     

重防腐涂装用聚氨酯、氟碳、聚硅氧烷3种面漆比较

简介了当前重防腐涂装所用的聚氨酯、氟碳、聚硅氧烷3种面漆,并从涂料成膜机理、性能、施工等方面作了比较。     

湛江地区石油储罐防腐配套漆的研究

对冷涂锌底漆、无机富锌底漆、环氧富锌底漆进行2 000 h的耐中性盐雾试验,结果表明:冷涂锌底漆和无机富锌底漆耐盐雾效果最佳,环氧富锌底漆次之;对脂肪族聚氨酯面漆、氟碳面漆、聚硅氧烷面漆进行耐人工气候老化试验,结果表明:氟碳面漆耐人工气候老化效果最好,脂肪族聚氨酯面漆次之,聚硅氧烷面漆较差。从经济性方面考虑,建议配套体系为"无机富锌+环氧封闭漆+环氧云铁漆+脂肪族聚氨酯面漆+氟碳面漆",这种配套体系相对以前的配套体系,成本增加约7元/m~2,但是防腐寿命至少增加5 a以上。     

一种聚硅氧烷面漆的研制及与市售产品性能的对比研究

采用丙烯酸聚硅氧烷树脂作为甲组分,氨基硅烷偶联剂为乙组分,制得一种聚硅氧烷面漆,研制出的产品具有优异的耐候性、耐化学品性等综合性能以及极低的VOC含量,符合HG/T 4755-2014《聚硅氧烷涂料》标准的要求,且与市售同类产品在盐雾、人工老化性能等方面相当.     

海洋大气区钢结构用改性聚硅氧烷涂料配套性研究

概述了海洋大气环境下钢结构保护涂层配套性及高耐久面漆的现状及发展趋势,主要从底面漆配套涂层的循环腐蚀老化试验结果,探讨改性聚硅氧烷涂料配套性优劣。     

高耐候性聚硅氧烷涂料的研制

以高硅含量、高固低黏的改性聚硅氧烷树脂为基础,制备了聚硅氧烷涂料,并用氨基硅烷固化,制得改性聚硅氧烷涂层。考察了氨基硅烷固化剂用量和种类对聚硅氧烷涂层老化失光和变色行为的影响规律。研究结果表明:在改性聚硅氧烷树脂固定不变的情况下,可通过固化剂的种类和用量调节聚硅氧烷涂料的耐老化性。聚硅氧烷涂料具有远优于聚氨酯涂料的耐老化性和耐盐雾性,可作为氟碳面漆的理想替代品。     

适用于酸雨地区的防腐涂层配套体系性能研究

为选出适用于酸雨地区的涂层体系,通过交流阻抗谱、人工耐老化试验、耐酸雾试验等评价了环氧底漆/丙烯酸改性聚酯面漆、环氧底漆/氟硅丙烯酸面漆、环氧底漆/聚氨酯面漆、环氧底漆/聚硅氧烷面漆和环氧底漆/氟硅面漆这5种涂料配套体系的耐蚀性、耐人工老化性和耐酸雾性,并用扫描电镜观察了涂层在模拟酸雨溶液中浸泡120 d后的表面形貌。结果表明,环氧底漆/硅氧烷面漆体系具有良好的耐人工气候老化和耐酸雾性,孔隙率小,附着力好,可为酸雨地区的输变电铁塔提供较好的防护。     

Reduction of soil resistance through the use of a composite coating

Generally, soil seriously resists the motionn of soil-engaging components of terrain machines and tillage equipment because soil has such strong adhesion. In order to develop a method to treat this problem, a polysiloxane/T8 composite coating was used in this study. The wettability of steel 45, steel T8, polysiloxane coating, and polysiloxane/T8 composite coating was measured using a contact angle testing instrument (JCC-1, made in China) at 20°C in air. The abrasive wear resistance of both steel 45 and polysiloxane/T8 composite coating was tested on a turnplate abrasive wear testing machine. The resistance of soil to bulldozing plates made of the aforementioned materials was measured on bulldozing resistance testing equipment. The experimental results showed that the polysiloxane/T8 composite coating had excellent hydrophobicity, and that the contact angle of water on its surface reached up to 92°, which is much larger than that of steel 45 and steel T8. The relative volume wear loss of the polysiloxane/T8 composite coating was 65% and its bulldozing resistance was reduced by 15.2%–22.3% compared to bare steel 45.     

Synthesis and Structure of Environmentally Friendly Hybrid Clay/Organosilane Nanocomposite Coatings

Environmentally friendly polysiloxane and clay/polysiloxane composite coatings were synthesized on aerospace-grade aluminum alloy AA2024-T3 substrates from mildly acidified aqueous solution. The polysiloxane coatings were synthesized by acid-catalyzed hydrolysis and condensation of organosilane coupling agents such as glycidoxypropyltrimethoxysilane (GPTMS) and tetramethoxysilane (TMOS) followed by solution drop-casting onto the substrate to form self assembled nanoparticles, coating. The epoxy polysiloxane coating formed by condensation reaction of hydrolyzed TMOS and GPTMS was subsequently cured with aminosilane coupling agent to form cross-linked polysiloxane coating. Clay/polysiloxane coating was formed by dispersing about 0.1–0.3wt% of clay in the hydrolyzed TMOS/GPTMS solution followed by solution casting and the resulting clay/polysiloxane composite coating was subsequently cured with aminosilane coupling agent. The structure and composition of organosilane coupling agents and hybrid polysiloxane coatings were determined by reflection–absorption infrared spectroscopy (RAIR) and X-ray diffraction spectrometry (XRD). The hydrolysis, condensation and curing reactions of TMOS and the organosilane coupling agents were studied by analyzing thin films cast on aluminum alloy substrate after a predetermined reaction time by using RAIR. The XRD results show that the resulting polysiloxanes are semi-crystalline polymers. Wide angle XRD analysis indicated that clay dispersed in clay/polysiloxane composite coating is either highly intercalated or partially exfoliated. This inference was drawn from the disappearance of d₀₀₁ diffraction peak for clay from the XRD spectrum of clay/polysiloxane coatings cured at 100 °C for 2.5 h.     

聚硅氧烷涂层对飞机座舱玻璃抗银纹能力的改进

介绍了飞机座舱玻璃银纹产生原因和聚硅氧烷涂层性质,通过涂覆后板材性能测试证明,涂层可以提高座舱玻璃抗银纹的能力。     

含氟聚硅氧烷应用进展

含氟聚硅氧烷兼具了有机氟和有机硅材料的耐高低温、耐化学腐蚀、耐油耐溶剂、低表面张力和低介电常数等优异性能,引起了人们极大的研发兴趣,广泛应用于汽车、电子、日用化学品、医学和航空航天等领域。本文介绍了近年来含氟聚硅氧烷在氟硅橡胶、氟硅低表面能涂料、氟硅防污涂料、氟硅防污闪涂料、氟硅离型剂、氟硅润滑油脂、氟硅压敏胶、氟硅消泡剂、氟硅整理剂、氟硅人工晶体和氟硅化妆品添加剂等领域的研究成果,分析了含氟聚硅氧烷在应用研究方面的发展趋势,最后指出可中低温固化的液体氟硅橡胶、耐化学腐蚀的氟硅低表面能涂料、高含氟量的长链含氟聚硅氧烷,以及可应用于3D打印成型技术的含氟聚硅氧烷将是未来氟硅应用研究的重要方向。     

Mechanical properties and thermal stability of ambient-cured thick polysiloxane coatings prepared by a sol–gel process of organoalkoxysilanes

Ambient-curable polysiloxane coatings were prepared by pre-hydrolysis/condensation of phenyltrimethoxysilane (PTMS) and dimethyldimethoxysilane (DMDMS) in the presence of ammonia solution and subsequently mixing with aminopropyltriethoxysilane (APS). The mechanical properties of coatings were thoroughly examined at both macro- and micro-level and the thermal stability of coatings was characterized by thermogravimetic analysis, both of which were correlated with coating composition and the hydrolysis/condensation degree of polysiloxane oligomer. It was found that pro-hydrolysis step is essential for fabrication of thick crack-free coatings (18–35 μm). Higher DMDMS molar ratio, more APS dosage and lower hydrolysis/condensation degree of polysiloxane oligomer favor enhancing the hardness. Excellent impact resistance (50 cm kg) of coatings was obtained at 5% and 10% APS dosage, despite of the type and structure of polysiloxane oligomer. Whatever, the best scratch resistance of coatings was attained using the polysiloxane oligomer, prepared at PTMS-to-DMDMS molar ratio of 2:8 and water-to-precursor molar ratio of 1:1, and 5% APS dosage. The polysiloxane coatings exhibit high thermal stability, however, which strongly depends on the coating composition.     

Development of the scratch resistance on acrylic sheet with basic colloidal silica (SiO2)—methyltrimethoxysilane (MTMS) nanocomposite films by sol–gel technique

The formation of scratch‐resistant coating film prepared from colloidal silica and a polysiloxane matrix was investigated. Methyltrimethoxysilane (MTMS) was hydrolysed and mixed with silica sol (SiO₂) at various compositions to form the hybrid hard‐coating nanocomposite film. The hydrolysed MTMS (polysiloxane) acts as the polymeric binder that is covalently linked to the colloidal silica surface and provides adhesion for the scratch resistant coating film to the substrate. The ratio between the polymeric matrix and the SiO₂ nanoparticles was found to play a major role in controlling the coating film appearance and its resistance to scratching. At a SiO₂ content < 30 wt.%, the agglomeration of the hydrolysed polysiloxane was observed and caused the opacity of the coating film. At a SiO₂ content >70 wt.%, there was not enough polysiloxane to act as a binder for the SiO₂, therefore a shrinkage upon solidification of the coating film caused cracking within the nanocomposite film. The optimum ratio was found to be at 40 wt.% ≤SiO₂ ≤60 wt.%, where the films had a transparent, crack free hard coating, with excellent scratch resistance, good adhesion and very good environmental resistance. The nanoindentation revealed that the nanocomposite film, at the optimum loading, possessed a higher strength with a higher SiO₂ loading. Film properties, including hardness, scratch resistance, adhesion and environmental resistance were also examined. The morphology of nanocomposite films was identified by atomic force microscopy (AFM) and scanning electron microscopy (SEM). © 2011 Canadian Society for Chemical Engineering     

The utilization of specific interactions to enhance the mechanical properties of polysiloxane coatings

Moisture-curable polysiloxanes were modified with ionic groups to enable specific interactions between the polysiloxane matrix and silica nanoparticle reinforcement. A trimethoxysilane-functional quaternary ammonium salt (QAS) was used to modify the polysiloxane matrix. A comparison of the mechanical properties of coatings containing QAS modification to analogous coatings without QAS modification showed that QAS modification resulted in a dramatic improvement in mechanical properties of silica nanoparticle-reinforced coatings. QAS modification provided major enhancements in both tensile modulus and toughness. The coatings were characterized using positron annihilation spectroscopy, photo-acoustic FT-IR, differential scanning calorimetry, transmission electron microscope, and atomic force microscopy. The characterization results suggested that the QAS moieties present in the polysiloxane matrix undergo specific interactions with the surface of silica nanoparticles enabling an enhancement in interfacial adhesion between the polymer matrix and the nanoparticles. Most likely, the specific interaction that provided the enhanced mechanical properties was an ion–dipole interaction involving silanol groups present on the surface of the silica nanoparticles. The enhanced modulus and toughness of these polysiloxane materials may enable their application as a fouling-release coating for ship hulls, since current polysiloxane-based fouling release coatings suffer from poor mechanical properties and durability.     

防涂鸦涂料性能改进浅见

介绍了防涂鸦涂料的改进方法,包括选用新树脂如聚硅氮烷,防涂鸦助剂如聚硅氮烷助剂、二氧化硅纳米粒子、聚二甲基硅氧烷、硅烷和含氟表面活性剂,以及采用纳米技术。