表面可修饰性有机硅密封材料的研究

有机硅密封材料表面张力小、表面能低、可涂覆性差。如何获得表面可修饰性的有机硅密封材料是近年来国内外研究的热点之一。在综述有关表面可修饰性有机硅密封材料研究进展的基础上,主要介绍其实现表面可修饰的方法和制备工艺,并展望其发展前景。     

纳米SiO_2/改性丙烯酸树脂低表面能防污涂料

低表面能防污涂料是船舶涂料的一个重要分支。利用有机硅改性的丙烯酸树脂作为成膜物质,纳米SiO2为填料,制备了低表面能纳米复合防污涂料。考察了有机硅单体对改性丙烯酸树脂性能的影响,发现随着有机硅含量的增加,改性后的树脂粘度减小,水接触角增加。研究了氟硅烷改性纳米SiO2含量对涂层形貌和水接触角的影响。结果表明,添加少量的氟硅烷处理的纳米SiO2(1%和3%)可显著增大涂层的水接触角,提高涂层的防污性能。添加纳米SiO2浆的涂层的水接触角要高于添加接枝氟硅烷纳米SiO2的涂层,而后者要高于添加未接枝氟硅烷纳米SiO2的涂层。当纳米SiO2的添加量在1%和3%时,涂层的水接触角分别达到101.8°和103°。采用纳米浓缩浆工艺分散后的纳米SiO2可以使涂层的表面形成微米-纳米的特征形貌,从而实现防污的目的。     

船舶热力管系用石墨烯耐高温重防腐涂料制备及性能研究

大体积链段修饰的微纳米粒子能够增强有机硅树脂耐热及防腐性能,利用硅烷对二氮双酚芴表面进行接枝改性,将其与氧化石墨烯化学接枝,制备得到大体积链段改性氧化石墨烯。将改性氧化石墨烯作为填料添加到耐高温防腐涂料中,对涂料的力学性能、耐高温、耐盐雾性等进行测试分析。研究结果表明,添加改性氧化石墨烯可有效增强涂层耐热性能与耐蚀性能,当添加量为1.0%时,涂层综合性能最优。     

丙烯酸流平剂Modarez~MFPC52S在涂料体系中的应用测试

在涂料施工后成膜过程中,常见有桔皮、鱼眼、缩孔等漆膜表面弊病,影响漆膜的外观。解决这些问题的有效方法是添加合适的流平剂,改善漆膜的流动和流平,提供平整、光滑和令人满意的漆膜表面。丙烯酸类流平剂是经常使用的一类流平剂。与有机硅类流平剂相比,丙烯酸类流平剂在提供流平性的同时,不仅不会带来诸如稳泡、影响层间附着力、污染环境等副作用,有些产品还能提供一定的消泡和底材润湿性。SYNTHRON(先创化学品)公司生产一系列的丙烯酸流     

硅烷改性水性聚氨酯表面施胶剂的制备与性能研究

以甲苯二异氰酸酯、混合多元醇为基本原料,N-甲基二乙醇胺为亲水扩链剂,有机硅为改性剂,通过醋酸中和反应制备出一种可用于纸张表面施胶的自乳化阳离子水性聚氨酯乳液;研究了硅烷用量、预聚温度、R值(体系中异氰酸酯基和羧基的摩尔比)、聚酯＼聚醚质量比对乳液性能和施胶效果的影响.结果表明:硅烷用量为4.5％,预聚温度为60℃,R值为1.10,聚酯＼聚醚质量比为3.6时制备的乳液性能良好;FT-IR分析表明有机硅烷已通过化学方法结合到聚氨酯分子链中;TGA分析表明有机硅的加入对水性聚氨酯耐热性有明显提高;粒径分析表明,有机硅的加入能使乳液粒子分布更均匀且粒径更小;施胶效果表明水性聚氨酯对改善纸张强度作用明显,有机硅烷的加入能显著提高纸张的施胶度.     

UV固化的环氧丙烯酸树脂耐磨加硬涂层的制备及性能

本文通过环氧树脂和丙烯酸为原料反应合成了环氧丙烯酸树脂(EA),然后用硅烷偶联剂3-甲基丙烯酰氧丙基三甲氧基硅烷(MPS)对其进行改性,得到可紫外光固化的有机硅耐磨透明涂层,并对涂层的各种性能进行了测试,如硬度测试、附着力测试和耐磨性能测试等.结果表明,相比未涂覆的有机玻璃基材,涂覆后的有机玻璃基材的表面硬度和透光率均有所增加,且随硅烷偶联剂含量的增加而有所提高.对耐磨涂层的热稳定性也进行了研究,结果发现,改性后的环氧丙烯酸树脂的热稳定性要明显好于未改性的.     

UV固化的环氧丙烯酸树脂耐磨加硬涂层的制备及性能（英文）

本文通过环氧树脂和丙烯酸为原料反应合成了环氧丙烯酸树脂(EA),然后用硅烷偶联剂3-甲基丙烯酰氧丙基三甲氧基硅烷(MPS)对其进行改性,得到可紫外光固化的有机硅耐磨透明涂层,并对涂层的各种性能进行了测试,如硬度测试、附着力测试和耐磨性能测试等。结果表明,相比未涂覆的有机玻璃基材,涂覆后的有机玻璃基材的表面硬度和透光率均有所增加,且随硅烷偶联剂含量的增加而有所提高。对耐磨涂层的热稳定性也进行了研究,结果发现,改性后的环氧丙烯酸树脂的热稳定性要明显好于未改性的。     

内墙装修首选——乳胶漆

目前,在室内墙壁装修中,乳胶漆是使用最多的装饰材料之一。 乳胶漆即是乳液性涂料的俗称,具体可分为聚醋酸乙烯乳液和丙烯酸乳液两大类。其特点是成膜性好、耐擦洗,耐候性、流平性等性能均优于传统的水性涂料。由于乳胶漆以水为分散介质,所以它不污染环境,安全、无毒、无火灾危险。同时,乳胶漆的涂膜呈开放型,透气性好,墙面基     

系列有机硅改性紫外光-热混杂固化树脂的表面性能

以有机硅改性丙烯酸环氧单酯为树脂配制了一系列紫外光-热混杂固化体系,用红外光谱(FT-IR)表征了固化过程特征吸收峰的变化;测试了有机硅链段的长短对固化膜表面水接触角、表面能和硅元素分布的影响。结果表明,在相同稀释剂条件下,丙烯酸环氧单酯光-热固化膜的表面水接触角为62.53°,表面能为47.62 mN/m,有机硅改性丙烯酸环氧单酯体系光-热固化膜的表面水接触角最高可达106.75°,相应的表面能为18.62 mN/m。有机硅改性体系中随着有机硅链段的增长,固化膜表面水接触角和表面硅元素含量逐渐增加,表面能则逐渐下降,表面元素分析也显示固化膜表面硅元素含量要比背面的高。     

系列有机硅改性紫外光-热混杂固化树脂的表面性能EI北大核心CSCD

以有机硅改性丙烯酸环氧单酯为树脂配制了一系列紫外光-热混杂固化体系,用红外光谱(FT-IR)表征了固化过程特征吸收峰的变化;测试了有机硅链段的长短对固化膜表面水接触角、表面能和硅元素分布的影响。结果表明,在相同稀释剂条件下,丙烯酸环氧单酯光-热固化膜的表面水接触角为62.53°,表面能为47.62 mN/m,有机硅改性丙烯酸环氧单酯体系光-热固化膜的表面水接触角最高可达106.75°,相应的表面能为18.62 mN/m。有机硅改性体系中随着有机硅链段的增长,固化膜表面水接触角和表面硅元素含量逐渐增加,表面能则逐渐下降,表面元素分析也显示固化膜表面硅元素含量要比背面的高。     

Concrete protection using acrylic latex paints: Effect of the pigment volume content on water permeability

Concrete can be protected by coatings, which may reduce the ingress of aggressive agents coming from external sources. Paints have a great importance on concrete durability due to the advantage of being applied to both newly built and old structures, the latter being for maintenance and repair purposes. Five acrylic latex paint formulations were prepared in laboratory. Their relative performance in inhibiting the ingress of water and their drying behavior were evaluated on concrete substrates. The relative absorption and loss of water over a length of time were determined on medium and high porosity concretes. The results showed a correlation between the paint pigment volume content and water permeability. The viability of using acrylic resin in architectural paint formulations for concrete protection against water penetration was confirmed.     

Improving properties of modified acrylic sheet via addition of graft natural rubber

The mechanical properties of a modified acrylic sheet prepared by bulk copolymerization of methyl methacrylate (MMA) and styrene (ST) were improved by the addition of a small amount of graft natural rubber (GNR). The graft copolymerization of MMA and ST onto natural rubber latex was carried out by emulsion polymerization using potassium persulfate as an initiator. The properties of the modified acrylic sheet containing GNR with 22.5 wt.% graft copolymer were investigated as a function of GNR content. The results indicated that the impact resistance, tensile strength and elongation at break of the modified acrylic sheet increased with the increase in the amount of GNR in the range of 0.5-4 parts. From the stress-strain behavior, the characteristic of the modified acrylic sheet shifted from brittle to ductile when the amount of GNR was increased. The scanning electron micrographs of the modified acrylic sheets show the relatively smooth fracture surface with relatively few small cracks. This implies that the GNR can be used as an impact modifier for acrylic plastics.     

铝合金阳极化氟碳保护涂料的研究

现有阳极化保护涂料普遍存在耐酸性和弹性差的缺点,为此,采用丙烯酸含氟单体、丙烯酸单体、丁苯橡胶(SBS)通过自由基共聚的方法合成了氟碳树脂,获得了一种耐酸、高弹的铝合金阳极化涂料.对树脂的红外光谱分析表明,丙烯酸含氟单体参与了共聚反应.通过原位共聚的方法引入了纳米二氧化钛.随着氟含量的提高,涂层的耐甲乙酮擦拭性、耐酸性、耐沸水附着力、耐人工老化等性能提高,当氟含量超过6%时涂层的附着力下降;纳米TiO2的引入使涂层的耐盐雾性、抗拉强度明显提高;当固体含量为25%,msbs/m单体=4%时,丁苯橡胶的引入,涂层在柔韧性、伸长率、耐磨性、冲击强度方面均有所提高.氟碳丙烯酸保护涂料能够满足铝合金阳极化绝缘保护的要求.     

Effect of waste latex paint on concrete

Approximately 20% of paint sold in western countries does not get used for its intended purpose, and in time much of this left-over paint ends up in land-fill as part of the household waste collection, at a significant economic and environmental cost. In New Zealand, a comprehensive product stewardship campaign has been initiated to recover waste paint before it enters the waste stream, while the collaboration amongst a cohort of companies has contributed to utilising waste latex paint in concrete. The objective of this study was to investigate the effects of waste latex paint on concrete, with special focus on a low strength standard 20 MPa concrete mix. It is demonstrated that waste latex paint can improve the workability and durability of concrete, whilst achieving sufficient compressive strength. Phase analysis indicated that the addition of waste latex paint does not affect the concrete hydrates. It was established that concrete with 12 L/m³ of waste latex paint is suitable for use in low strength non-structural concrete.     

Waste paint as an admixture in concrete

A significant volume of waste latex paint exists in New Zealand, with the rate of supply rapidly growing, prompting an investigation into the use of waste paint as a polymeric admixture in concrete due to similarities in chemical compositions of waste paint and polymeric admixtures. The objective of this study was to produce a blockfill mix capable of maintaining or improving the properties of the hardened material whilst increasing the efficiency of the construction process. The optimum dosage to achieve the required strength and workability was found to be approximately 12% replacement of mix water with waste paint, while the Modulus of Elasticity was found to be a function of compressive strength. Rheological testing indicated that regardless of paint concentration, the yield stress of the blockfill increased whilst the viscosity and separation rate decreased. It was established that waste latex paint was a suitable replacement for conventional admixtures in concrete masonry blockfill, resulting in maintained strength and improved workability.     

水溶性单体对聚合物乳液在水泥浆体中稳定性的影响

以水泥浆的流动性和筛上残余率为评价指标研究了水溶性单体丙烯酸(AA)、N-羟甲基丙烯酰胺(NMA)、甲基丙烯酸羟乙酯(HEMA)单独使用或组合使用对聚合物乳液在水泥浆中稳定性的影响,并对其影响机制进行探讨。结果表明,不管水溶性单体是单独使用还是组合使用,随其总含量(0%~4%)的增加,聚合物乳液在水泥浆中的稳定性增加。在相同含量时,不同结构的水溶性单体对聚合物乳液在水泥浆中稳定性的贡献大小为NMAAAHEMA,与它们的无机性值/有机性值的比值有着很好的一致性。水溶性单体的含量和种类决定着聚合物乳液的钙离子临界凝聚浓度(CCC),聚合物乳液的CCC值越高,其在水泥浆中稳定性越好。水溶性单体越倾向于分布在乳胶粒表面,越有利于聚合物乳液的稳定。     

纳米SiO2/聚丙烯酸酯复合乳液的性能研究

在丙烯酸酯乳液聚合过程中,引入由硅酸乙酯原位水解形成的SiO2,制备了新型的纳米SiO2/聚丙烯酸酯复合乳液.用红外光谱(IR)、扫描电镜(SEM)、透射电镜(TEM)以及综合热分析等手段,表征了复合乳液涂膜的特征.结果表明,引入原位形成SiO2的乳液体系,各组分的均匀度及稳定性均很好,尤其可提高复合涂层的热稳定性和抗回粘性,可望在耐水包装领域得到广泛的应用.     

复合乳液水溶胶的转化及其流变性的研究

用种子聚合法合成核壳型丙烯酸腹复合乳液,并转化成水溶胶。测定玻璃化温度对核过 合乳液进行表征。考察了聚合方法,丙烯酸用量,氨化温度等对乳液及其水溶胶的影响。     

植物纤维增强石膏复合材料的微观结构研究

通过电镜分析研究了掺入矿渣、普通硅酸盐水泥等物质对石膏基复合材料结构性能的影响;并采用苯丙乳液对植物纤维进行表面处理,有效地改善了植物纤维石膏复合材料的界面结合状况,使其力学性能得到显着提高.     

FUNDAMENTAL STUDY OF PAINT SYSTEMS FOR MOBILE PHONES

The diversity of paint arises from the properties required of a coating. All ideal properties cannot be met in a single product because the paints are are constrained by the nature of the substrate on which the paint is used. The choice of polymer determines the paint film properties and as such, is the most important factor in the formulation of a paint. In this investigation, poly(vinylchloride) (PVC) copolymer with other principal monomers such as acrylic and polyurethane were studied. In addition to mechanical properties, abrading, adhesion, and scratch resistance were studied. Special attention was focused on the chemical resistance to ethanol and artificial perspiration. PVC copolymerization with acrylic or polyurethane was found to significantly enhance the chemical resistance of the basic binder system. In the free-radical polymerization process of PVC, it improved the physical properties of the paint system in terms of its permeability to acid. This prevents corrosion of aluminum flakes in the metallic paint used for mobile phones.