硅烷偶联剂对硅酮密封胶性能的影响

探讨了3种硅烷偶联剂与复配硅烷偶联剂对所制备硅酮密封胶性能的影响,包括：表干时间及固化深度、粘接性能、力学性能、热贮稳定性。其中,复配硅烷偶联剂对提高硅酮密封胶的以上性能效果显著,尤其是粘接性能。     

硅烷偶联剂NXT在全钢载重子午线轮胎钢丝带束层粘合胶中的应用

试验研究硅烷偶联剂NXT在子午线轮胎钢丝带束层粘合胶中的应用.结果表明,在子午线轮胎钢丝带束层粘合胶生产配方中添加1.5份硅烷偶联剂NXT,可以有效降低胶料的门尼粘度、减少混炼段数、降低胶料的滞后损失、提高胶料与钢丝的粘合性能,且成品轮胎的耐久性能提高.     

Water-repellent all-cellulose nanocomposite using silane coupling treatment

Water-repellent all-cellulose nanocomposite (ACNC) was made using the silane coupling agent dodecyltriethoxysilane. The ACNC, consisting of cellulose nanofibers incorporated into a cellulosic matrix, was prepared by reducing crystallinity in the surface of the cellulose nanofibers using DMAc/LiCl solvent, followed by applying pressure and drying. The ACNC surface turned from hydrophilic to hydrophobic by silane coupling treatment. X-ray photoelectron spectroscopy (XPS) measurements confirmed the existence of the silane coupling agent on the surface after treatment. As silane concentration increased, the water contact angle of treated ACNC increased, to a maximum value of 93°. Thermogravimetric analysis and atomic force micrographs showed a multilayered treatment. The silane treated ACNC showed lower water absorption compared to that of untreated one. The silane coupling treatment was also found to increase the mechanical performance of ACNC. Creation of a hydrophobic surface reduces the potential damage associated with water in outdoor applications of ACNC.     

硅烷偶联剂改性环氧丙烯酸酯的合成与应用

针对环氧丙烯酸酯附着力和柔韧性差的缺点,通过在环氧丙烯酸酯中引入硅烷基团,合成硅烷改性的环氧丙烯酸酯。考察了各工艺参数对反应产品的影响,通过滴定和红外光谱分析跟踪反应进程和确定产物结构。合成产物通过和光固化单体、光引发剂混配成紫外光固化胶粘剂,并与改性之前的环氧丙烯酸酯作为主体树脂时的紫外光固化胶粘剂的性能进行了对比。研究发现,合成产物通过硅烷基团的引入,改善了环氧丙烯酸酯的柔韧性。同时,由于硅烷偶联剂基团在固化过程中水解露出的硅羟基增强了对无机底材的附着力,使得紫外光固化胶粘剂的综合性能得到了优化和改善。     

硅烷偶联剂的应用进展

简要介绍了硅烷偶联剂的偶联机理、选用原则及其在复合材料中的应用，包括用作玻璃纤维的处理剂、无机粉末填料的处理剂和胶粘剂、密封剂的增粘剂；另外，还介绍了硅烷偶联剂对橡胶性能的影响。     

如何受益硅烷偶联剂的奇妙功效

介绍了硅烷偶联剂的常规品种和新型产品：简述了硅烷偶联剂的作用机理和性能改进；总结了硅烷偶联剂的使用方法和注意要点：提出了只有正确使用才能奇效凸显，获益匪浅。     

Adhesion of carbon steel and natural rubber by functionalized silane coupling agents

This study characterized a method of adhesion between uncured natural rubber and carbon steels (CS) by the surface modification of the CS with silane coupling agents comprising amino, thiol, glycidoxy, and isocyanate organic functionality. The effects of the functionalization of the silane coupling agents on adhesion between CS and uncured natural rubber were investigated by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, atomic force microscopy, and local nanoscale thermal analysis. The reaction mechanism among the CS, silane coupling agent, and natural rubber was studied, revealing that adhesion was optimized and cohesive failure achieved when 3-(trimethoxysilyl)propylamine (APS) was used to modify the CS. The CS was shown to be directly silanized by the silane coupling agents, but the reactions between the natural rubber and the silane coupling agents was dependent on silane functionality.     

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     

Corrosion protection properties of silane pre-treated powder coated galvanized steel

Silane based products are becoming an interesting material for pre-treatment deposition, because, for the environmental compatibility, they can be used as substitutes of traditional pre-treatments like chromates. Silanes have been studied as new pre-treatments before organic coating deposition for many different metals, including aluminium, copper and zinc.In this work, some results concerning the properties of water-based silane pre-treatments on galvanized steel will be presented.Galvanized sheets obtained by continuous hot dip process were considered. A silane based bath containing a mixture of three different silanes were used for the pre-treatment deposition (Glycidoxypropiltrimethoxysilane, Tetraethoxysilane and Methyltriethoxysilane).The obtained pre-treatments were characterized by SEM observations, FT-IR and ToF-Sims analysis. The corrosion protection properties of the pre-treated galvanized samples were studied using industrial accelerated tests (like salt spray exposure) and electrochemical measurements (polarization curves and electrochemical impedance spectroscopy (EIS) measurements), as a function of the different curing conditions. The pre-treated galvanized sheets were further coated with an epoxy-polyester powder coating, in order to verify the adhesion promotion properties and the corrosion protection performances of the complete protective system.The coated samples were characterized by EIS measurements with artificial defect in order to study the interfacial stability (adhesion) in wet conditions and monitor the coating delamination.The electrochemical data were compared with adhesion measurements obtained by cathodic delamination tests. The electrochemical tests showed that the silane layer acts not only as a coupling agent between the inorganic substrate and the organic coating, but it also ensures a good barrier effect against water and oxygen.     

Facile fabrication and modification of epoxy acrylate latexes by epoxy resin and silane coupling agent

For the purpose of obtaining solvent-free epoxy acrylate latexes of good stability and excellent integrated performance, the epoxy acrylate latexes were fabricated using facile semi-continuous emulsion polymerization with varying amounts of epoxy resin and were modified by a silane coupling agent γ-methacryloxypropyltrimethoxysilane (KH-570). The effects of epoxy resin and KH-570 amounts on the performance of latexes and films were investigated from the aspects of particle size, morphology, tensile measurements, resistance properties, adhesion force, and thermal behavior. The results indicated that the acrylate monomers did graft onto the molecular chain of E-51 characterized by both epoxy value and Fourier transform infrared. Additionally, an emulsion of 80–100 nm particle size with a narrow distribution was obtained. The latex films retain resistances to satisfactory water, acid, alkali, and alcohol while maintaining good thermal stability, adhesion force, and flexibility. The importing of KH-570 could reinforce the spatial structure and cross-linking density and then improve the tensile strength of the latex films properly while keeping other performances well. This work provides a facile pathway for the optimized performance for epoxy acrylate latexes, and represents a tendency for environmental protection.     

防腐涂料用苯丙乳液的新型改性偶联剂的选择

采用新型二烷氧基型硅烷偶联剂及传统三烷氧基型硅烷偶联剂对苯丙乳液进行改性,通过电化学阻抗方法对改性前后涂膜的防腐性能进行研究。结果表明,改性涂膜的防腐性能优于未改性涂膜,而新型二烷氧基型硅烷偶联剂KH-578改性苯丙乳液的防腐性能最佳。     

Quinone‐amine polyurethanes: new coupling agents for the steel‐epoxy system

A new series of quinone‐amine polyurethanes (QAPs) were synthesized using toluene diisocyanate, polytetrahydrofuran, and an amine‐quinone monomer (AQM1). The AQM1 was synthesized and characterized using spectroscopic techniques (UV, IR, NMR). The QAP synthesis involved a two‐step process and yielded block copolymers. These polymers were characterized using infrared spectroscopy, thermal analysis methods (thermogravimetric analysis and differential scanning calorimetry) and gel permeation chromatography. Steel coupons were treated with dilute solutions of the QAPs and analyzed using surface spectroscopic techniques (X‐ray photoelectron spectroscopy, infrared reflection spectroscopy). These tests indicate that the polymer shows chemical interactions with the steel surface. The QAPs were tested for their efficiency as polymeric coupling agents to enhance the adhesion of steel to epoxy. The coupling agent treated epoxy–steel torsional joints were tested in shear. They demonstrated 10–15% dry strength improvement when compared to steel–epoxy controls. The QAPs can serve as very effective coupling agents for the steel–epoxy system. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1338–1350, 2000     

硅烷偶联剂改性纳米SiO_2对环氧体系凝胶的影响

研究了硅烷偶联剂KH-792改性纳米SiO2对环氧树脂E-44/低分子质量聚酰胺LMWPA651固化体系凝胶时间的影响。结果表明:加入质量分数5%的纳米SiO2可以大幅度降低凝胶时间,且与体系配比无关;当低分子质量聚酰胺与环氧树脂的质量比值>0.6时,KH-792改性SiO2比未改性SiO2更有利于体系凝胶时间的降低。     

硅烷偶联剂对复合水泥砂浆性能的影响

通过红外光谱分析及砂浆强度测试，研究了硅烷偶联剂对不同种类复合水泥砂浆的稠度、分层度、抗折强度及抗压强度的影响。结果表明，加入硅烷偶联剂能提高普通水泥砂浆、苯丙胶乳改性水泥砂浆的抗折强度和抗压强度；当硅烷偶联剂质量分数为0．5％时，普通水泥砂浆的抗折强度和抗压强度达到极大值，提高约10％；当硅烷偶联剂质量分数为1％时，苯丙胶乳改性水泥砂浆的抗折强度和抗压强度达到极大值，提高约20％；同时，硅烷偶联剂还能增大普通水泥砂浆和苯丙胶乳改性水泥砂浆的稠度，但砂浆的分层度略有增大。加入经硅烷偶联剂处理的钢纤维，能够提高普通水泥砂浆及苯丙胶乳改性水泥砂浆的抗折强度和抗压强度；当钢纤维用硅烷偶联剂质量分数为1％的硅烷偶联剂水溶液处理时，钢纤维增强砂浆的抗折、抗压强度达到极大值，提高10％以上。     

硅烷在锌铝涂层中的应用

以硅烷为主要成分的金属防腐处理剂具有高效能、低成本、低污染的特点,近年来硅烷偶联剂在金属防腐蚀涂层中应用广泛.本文介绍了硅烷的特点和作用机理,综述了硅烷在锌铝涂层中的应用.     

Adhesion improvement of UV-curable ink using silane coupling agent onto glass substrate

In order to enhance the adhesions of the UV-curable inks onto glass substrate, the silane coupling agents were added into the mixture of monomer and oligomer. The monomer, containing high functionality or surface tension could lead to a high cross-link density of the polymeric network and low adhesions of UV-curable inks. With the amount of ethyoxyls of ethoxylated trimethylolpropane triacrylate increasing, adhesions of the oligomers were improved. As the monomer concentration increased, the adhesion ability of UV-curable ink onto glass was decreased. The adhesion ability of UV-curable inks onto glass was increased via adding silane coupling agents. When the concentration of the silane coupling agents was more than 12%, the adhesion ability of UV-curable inks onto glass was decreased. Silane coupling agents (3-methacryloxypropyl) trimethoxy silane (KH570) and (3-aminopropyl) triethoxy silane (KH550) were more effective than (3-glycidoxypropyl) trimethoxy silane (KH560) in the inks under the same concentration. Video microscope and scraper fineness test revealed that the pigment particles declined with the increase of grinding times, whereas the adhesions of UV-curable inks were enhanced.     

Optimization of microencapsulation of silane coupling agent by spray drying using response surface methodology

A microcapsule containing a silane coupling agent was prepared by spray drying. The optimal encapsulating condition was determined by employing a response surface methodology with a central composite design. The effect of emulsion’s solid content and oil concentration, inlet air temperature, and atomizer speed on properties of microcapsule were investigated. The resulting microcapsule containing silane coupling agent and possessing an unbroken surface and a good shape under optimized conditions exhibited an encapsulation efficiency of 82.7%, average size of 21.3?µm, and moisture content of 0.93%. The experimental results agree well with the model prediction, with a relative error below 5.0%.     

Adhesion to zirconia as a function of primers/silane coupling agents,luting cement types,aging and test methods

This study evaluated the adhesion of resin cements to zirconia with different primers/silane coupling agents using two test methods with and without aging. Zirconia discs (Cercon) (N = 900, n = 15 per group) were ground finished to 2000 grit silicone carbide and randomly divided into seven groups: (a) C: No treatment (Control), (b) SG: Signum, (c) CL: Clearfil Ceramic Primer, (d) AP: Alloy Primer, (e) Monobond Plus, (f) ES-R: ESPE-Sil after Rocatec and (g) ES-C: ESPE-Sil after CoJet. Methacrylate (Variolink II-VL) and MDP based (Panavia F2.0-PN) dual-polymerized and self-adhesive resin cements (RelyX Unicem-RX) were adhered and polymerized accordingly. The specimens were further randomly divided into two groups to be tested after (a) 24-h dry storage at 37 °C and (b) thermocycling (×5000, 5–55 °C). Macroshear (MSB) and macrotensile bond tests (MTB) were conducted in an universal testing machine (crosshead speed: 1 mm/min) and failure types were analyzed after debonding. Data were analyzed using Univariate analysis and Tukey’s tests (α = 0.05). Two-parameter Weibull modulus, scale (m) and shape (0) were calculated. While primer/silane (p < 0.001), cement type (p < 0.001) and aging (p < 0.001) significantly affected the bond results, test method did not show significant difference (p = 0.237). In MSB test, Weilbul moduli were more favorable for MP-VL (4.2) and AP-PN (6) combinations and after aging for MP-VL (4.2) and AP-PN (5.66). In MTB test, after aging, Weilbul moduli were more favorable for AP-PN (5.41). Bond strength results mostly decreased with SG (24–92%) after aging. Cohesive failures in the cement were more frequent with PN (252) compared to VL (83).     

Effect of silane KH‐550 to polypropylene/brucite composite

The effect of the KH‐550 type silane coupling agent on the properties of polypropylene (PP)/brucite (BC) composite was studied. X‐ray diffraction, scanning electron microscope, and polarization optical microscope indicated that morphology structure of PP changed with the addition of KH‐550, which activated the heterogeneous nucleation centers on BC surface, which made the distribution of the spherulite diameter become narrow and uniform, and improved the dispersibility of BC in the matrix. Therefore, KH‐550 enhanced the interfacial adhesion of matrix‐filler and improved the compatibility of the PP/BC composite, when KH‐550's content was 2.9% the tensile strength and impact strength increased approximately by 90% and by 30%, respectively than PP/BC. Flow tests and IR proved that some reactions took place between BC and KH‐550. All the investigations showed KH‐550 was a proper coupling agent in the PP/BC composite. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

硅烷偶联剂对玻纤/聚丙烯复合材料的影响

分别选用KH550、KH570两种硅烷偶联剂处理无碱无捻粗纱,采用挤出、注塑成型技术制备玻纤增强聚丙烯复合材料,对复合材料进行了分析和研究。结果表明：硅烷偶联剂具有提高GF/PP复合材料性能的作用。SEM显示KH570处理GF与PP基体之间形成了良好的界面,界面层起到很好的应力传递作用,达到良好的增强效果。