无机硅溶胶外墙涂料的研制

针对目前硅溶胶外墙涂料稳定性差的缺点,将硅溶胶与有机乳液进行复配,通过选用乳液及pH值稳定剂,制得稳定性好的无机硅溶胶外墙涂料。试验结果显示,该涂料热贮存稳定性好,兼具无机涂料和有机涂料的特性,其耐沾污性和耐候性比普通外墙乳胶涂料有所提高。     

硅溶胶-苯丙乳液复合外墙涂料的研制

采用正交试验法将硅溶胶与苯丙乳液冷拼复配,配以颜填料和助剂经研磨分散制得硅溶胶-苯丙乳液无机/有机复合外墙涂料。通过对复合涂料进行性能检测,结果显示该涂料兼具有无机涂料和有机涂料的特性,其耐沾污性能、耐候性和隔热性能比普通外墙乳胶涂料有所提高。     

产品开发

开发硅溶胶高端产品前景好 硅溶胶广泛用于有机和无机材料粘结剂中,用于涂料,精密铸造、耐火材料及电子工业等行业中。目前国内产品主要是常规颗粒的普通硅溶胶,许多高附加值、高技术含量的系列硅溶胶产品主要依靠进口,这些产品主要有：①大颗粒硅溶胶;②超细颗粒硅溶胶;③造纸行业专用硅溶胶;④高纯电子级硅溶胶;⑤高纯度高稳定性的酸性硅溶胶等。其发展空间很大,开发前景好。     

调湿抗菌内墙涂料的研制

以苯丙乳液与硅溶胶组成有机-无机复合基料，以硅藻土、高吸水性树脂、海泡石粉组成调湿材料，在非吸湿颜填料、负离子添加剂及助剂的配合下，制备成调湿抗茵内墙涂料。该涂料不但具有普通内墙涂料的一般物理性能，而且还具有调湿防结露功能，同时还能释放负离子、抑茵抗茵、祛除有害气体、清新空气，是一种新型环保、节能的内墙涂料。     

丙烯酸/12硅溶胶复合比对复合涂膜性能的影响

以丙烯酸乳液、硅溶胶为基本原料，通过添加偶联剂、闪蚀抑制剂等制备出有机／无机复合涂料，结合复合基料的微观结构，探讨了丙烯酸／硅溶胶的复合比对复合涂料的耐温性、耐有机溶剂性、耐盐水性等性能的影响。结果表明：复合涂膜的耐盐水、耐有机试剂、耐热性能均比纯丙烯酸涂膜大幅度提高；丙烯酸／硅溶胶复合基料固化膜随着其中硅溶胶含量的增加，硅溶胶成分有在涂膜表面富集的倾向，[第一段]     

常温固化无机树脂研制及其涂料制备

讨论了一种由硅溶胶、氢氧化钾、偶联剂、烷氧基硅烷为主要原材料制备的室温固化的高模数硅酸钾树脂,该树脂具有硬度高、附着力和贮存性好等特点。着重讨论了硅溶胶、温度、偶联剂、硅氧烷、杂质、pH对室温固化树脂制备的影响;并采用该树脂制备了富锌涂料,与国内外样品进行了比较,该涂料在贮存稳定性方面具有优异的性能。     

硅溶胶-苯丙无机／有机复合乳胶建筑涂料的研制

采用正硅酸乙酯（TEOS）为主要原料通过溶胶聚合法制备硅溶胶，制得的硅溶胶与苯丙乳液冷拼复配得到复合基料，将该基料结合优质的颜、填料和助剂经研磨分散制得硅溶胶-苯丙复合建筑涂料。通过正交试验分别确定了制备硅溶胶、硅溶胶-苯丙复合乳液和硅溶胶-苯丙复合建筑涂料的最优方案。对硅溶胶-苯丙复合建筑涂料综合性能检测，耐洗刷次数高达11296次、涂膜吸水率为3．21％、[第一段]     

硅溶胶产品热点研发和应用方向探讨

硅溶胶系无定形二氧化硅聚集颗粒在水中均匀分散形成的胶体溶液,根据pH值范围可分为酸性、碱性和中性硅溶液。由于硅溶胶中二氧化硅例子具有较大的表面活性,经过表面改性又能与有机聚合物混溶,因此被广泛用于有机及无机材料粘结剂中,用于涂料、精密铸造、耐火材料以及电子工业等行业。     

有机-无机复合陶瓷涂料的制备及其结构和自散热性能的研究

采用溶胶-凝胶法,以甲酸为催化剂,用甲基三甲氧基硅烷(MTMS)改性硅溶胶制备出了有机-无机复合陶瓷涂料,在铝基材上喷涂、固化,得到陶瓷涂膜。采用粒度分析、热重分析(TGA)、红外光谱(FT-IR)研究了陶瓷涂料的结构,考察了陶瓷涂膜的自散热性能及不同颜色陶瓷涂膜自散热性能的差异。结果表明:随着反应时间的延长,改性硅溶胶的粒径逐渐变大、粒径分布逐渐变宽,说明硅溶胶和MTMS发生了水解缩聚反应,生成有机-无机复合陶瓷涂料;要得到热稳定性好的陶瓷涂层,其固化温度要在250℃以上,甚至300℃。陶瓷涂层具有明显的自散热性能,颜色深一些的陶瓷涂层的自散热效果更好。     

硅溶胶的制备及其在涂料中的应用

综述了硅溶胶生产的原理及方法，指出离子交换法和单质硅粉溶解法是当前硅溶胶生产的主要方法。并且单质硅粉溶解法具有较大发展潜力；归纳了硅溶胶在涂料中的应用及其实现途径，并针对硅溶胶的特点进行了分析，就目前硅溶胶与高分子聚合物乳液复合材料的制备提出了建议。     

Study the factors affecting the performance of organic–inorganic hybrid coatings

In this article, a series of hybrid organic–inorganic coatings based on silica‐epoxy composite resins were prepared with the sol‐gel method by using γ‐aminopropyl triethoxysilane as a coupling agent. Especially, the research emphasized on the factors that influenced on the properties of the prepared hybrid coatings. Firstly, epoxy resin was reacted with γ‐aminopropyl triethoxysilane at a specific feeding molar ratio; subsequently, the asprepared sol–gel precursor was cohydrolyzed with tetraethoxysilane (TEOS) at various contents to afford chemical bondings to form silica networks and give a series of organic–inorganic hybrid coatings. They were loaded and cured on steel panels and characterized for FTIR, TGA, DSC, water contact angles (WCA), pencil hardness, surface & three‐dimensional morphological studies, and potentiodynamic polarization tests. The surfaces of the hybrid coatings showed Sea‐Island or Inverting Sea‐Island morphologies at a certain relative content of two components, which made the coatings possess hydrophobic property. Due to the contribution of organic and inorganic components, the prepared hybrid coatings possess a lot of properties such as pencil hardness, thermotolerance, and corrosion resistance. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 41010.     

Preparation and anticorrosive properties of hybrid coatings based on epoxy‐silica hybrid materials

A series of sol‐gel derived organic–inorganic hybrid coatings consisting of organic epoxy resin and inorganic silica were successfully synthesized through sol‐gel approach by using 3‐glycidoxypropyl‐trimethoxysilane as coupling agent. Transparent organic–inorganic hybrid sol‐gel coatings with different contents of silica were always achieved. The hybrid sol‐gel coatings with low silica loading on cold‐rolled steel coupons were found much superior improvement in anticorrosion efficiently. The as‐synthesized hybrid sol‐gel materials were characterized by Fourier‐transformation infrared spectroscopy, ²⁹Si‐nuclear magnetic resonance spectroscopy and transmission electron microscopy. Effects of the material composition of epoxy resins along with hybrid materials on the thermal stability, Viscoelasticity properties and surface morphology were also studied, respectively. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

Scratch resistance of nano-silica reinforced acrylic coatings

Organic–inorganic hybrid coatings were obtained by a dual-curing process combining the sol–gel reaction with the UV-induced polymerization technique by starting from bisphenol A ethoxylate (15 EO/phenol) dimethacrylate (BEMA, as organic network former), methacryloyloxypropyl-trimethoxysilane (MEMO, as coupling agent) and tetraethoxysilane (TEOS, as inorganic silica network precursor). For comparison, TEOS was also substituted with preformed silica nanoparticles. Scratch test was carried out in order to study the scratch resistance of that silica reinforced acrylic resins. Excellent scratch resistant coatings were obtained by UV and sol–gel dual curing process. On the contrary, coatings with very poor scratch resistance were obtained by dispersing preformed nano-silica into the acrylic resin indicating the key role played by the morphology of the inorganic filler and its interaction with the organic matrix.     

TEM,XPS and thermo-mechanical properties of novel sustainable hybrid coatings

This work contributes to the development of a new generation of protective coatings composed of organic–inorganic materials. A silica based hybrid film was used in this work as high performance materials. The silica sol–gel film reveals enhanced thermo-mechanical properties in comparison with the pure polymer film. Herein, we demonstrate the possibility of employing cheap SiO₂ as prospective nano-fillers for hybrid coatings with active thermo-mechanical properties. Organic–inorganic hybrid coatings based on polyimide and silica were synthesized through a simple physical mixing technique. 3,3′,4,4′-Biphenyltetracarboxylic dianhydride (BPDA), benzene-1,3-diamine (BDA), 3,3′-oxydianiline (ODA) and SiO₂, were used as precursors for the hybrid coatings. These hybrid coatings were deposited via spin coating onto a galvanized iron, aluminum and copper in order to study the adhesive strength. The effects induced by the silica content on the mechanical properties of the coated samples were investigated. The mechanical properties of hybrid composite were found to be enhanced compared to polyimide coating. The main objective was to observe potential improvements in the mechanical and thermal properties of PI–silica hybrid films. Morphology, and structural changes in the composite films were studied as well as adhesion and impact strength and these characteristics were compared with those of unreinforced polyimide films.     

新型硅溶胶改性环氧复合涂料的制备及性能分析

通过溶胶-凝胶法制备氨基改性硅溶胶,并将其掺混改性E-44环氧树脂以得到硅溶胶改性环氧复合涂料。利用红外光谱(FT-IR)、接触角、热重(TGA)等对所得涂层进行分析测试。结果表明:当加入的改性S iO2硅溶胶占环氧树脂含量为2%~5%时,涂层的附着力、硬度、耐冲击性、柔韧性等较好,同时涂层的耐酸、耐碱、耐汽油、耐蒸馏水、耐盐水效果也达到实际使用标准。杂化涂层中S iO2与环氧树脂两相间存在化学键及氢键作用,有机-无机杂化交联的结果,可提高涂层的耐高温及防腐蚀性能。     

Ternary evaluation of UV-curable seed oil inorganic/organic hybrid coatings using experimental design

Inorganic/organic hybrid coatings were prepared using epoxidized linseed oil with combinations of the two sol–gel precursors (titanium(IV) isopropoxide, tetraethyl orthosilicate), and a telechelic silicate based on a modified oligomeric caprolactone. The coatings were UV-cured with sulfonium initiators which concomitantly cured the epoxy functional organic phase and the sol–gel inorganic phase to form a co-continuous inorganic/organic system. A ternary experimental design was employed to elucidate the influence of inorganic modifier on the mechanical properties of the inorganic/organic hybrid coatings. Small angle X-ray scattering (SAXS) was used to evaluate radius of gyration of the metal-oxo-cluster. Various coating properties, such as hardness, impact resistance, adhesion, solvent resistance, and surface energy were investigated as a function of sol–gel precursors. Inorganic/organic hybrid coatings containing both tetraethyl orthosilicate and the modified caprolactone resulted in improved hardness and solvent resistance with no loss of impact strength. The inclusion of titanium(IV) isopropoxide in to the systems resulted in a systematic reduction in the coatings properties. This was attributed to inhibition of the organic crosslinking process as a consequence of absorption of ultraviolet light by the titanium-oxo-clusters.     

Weatherability of hybrid organic–inorganic silica protective coatings on glass

Currently, there is a growing interest in the application of silicon-based technologies for the development of advanced hybrid organic–inorganic coatings with strong weatherability. In this study, the sol–gel process is used to prepare such coatings on glass and their resistance to weathering effects is assessed afterwards. Various sols were prepared by mixing a silica-based inorganic matrix (tetraethyl orthosilicate) with different quantities of silica alkoxides functionalised with various organic groups. Subsequently, the sols were dip-coated onto glass samples at low temperatures without any heat treatment. The coatings prepared were analysed before and after three model ageing tests simulating various weathering parameters. After ageing, the best performing coatings showed good overall homogeneity and transparency (optical microscopy, SEM), improved water repellency and adhesion to the glass substrate (static contact angle measurements, cross-cut tape tests) and no colour or chemical composition changes (UV–VIS, FTIR). Compared with commercial hybrid silica products, the alkyl- and methacryloxy-functionalised silica coatings particularly displayed improved homogeneity, elasticity and barrier properties. Thus, these low temperature coatings, easily applicable to thin films, appear to fulfil the main requirements for the protection of the glass exposed to weathering phenomena.     

Preparation and characterization of phosphine oxide containing organosilica hybrid coatings by photopolymerization and sol–gel process

A series of UV-cured organic–inorganic hybrid coating materials containing up to 20 wt.% silica were prepared by sol–gel method from tetraethoxy silane (TEOS) which is used as the primary inorganic precursor, and diallylphenylphosphine oxide monomer (DAPPO), aliphatic urethane diacrylate resin (Ebecryl 210) are employed as the source of the organic components. In addition, methacryloxypropyltrimethoxy silane (MAPTMS) was used as both a secondary inorganic source and a silane-coupling agent to improve the compatibility of the organic and inorganic phases. The DAPPO content in all the coating formulations were from 0 to 20 wt.%. The physical and mechanical properties such as gel content, hardness, adhesion, gloss, contact angle as well as tensile strength were measured. These measurements revealed that all the properties of the hybrid coatings improved effectively, in case of adding the sol–gel precursor and DAPPO monomer content in the hybrid systems. The photo-calorimetric-DSC studies showed that the double bond conversion of the hybrid coatings was faster than the coating materials without silica. The thermal stabilities of the UV-cured hybrid materials were investigated by thermogravimetric analysis. The results showed that the addition of sol–gel precursor and DAPPO into the organic network also improves the thermal-oxidative stability of the hybrid coating materials. The surface morphology was also characterized by scanning electron microscopy (SEM). SEM studies indicated that inorganic particles were dispersed homogenously throughout the organic matrix.