地铁工程用弹性环氧封缝胶的研究与应用

研究了稀释剂、增韧剂对弹性环氧封缝胶力学性能的影响。通过对配方的优化,制得了一种力学强度与柔韧性能均良好的弹性环氧封缝胶,并应用于长沙地铁2号线的裂缝修补工程中,取得了良好的效果。     

新型弹性环氧胶粘剂在湖南问世

新一代弹性环氧胶粘剂前不久由长沙蓝星化工新材料有限公司开发成功,该产品也被认定为湖南省高新技术产品。新型弹性环氧胶粘剂共包括7大品种:新型弹性环氧胶粘剂、室温固化柔韧性环氧胶粘剂、滴塑水晶硬质胶粘剂、滴塑水晶软质胶粘剂、砂轮专用胶粘剂、砂轮专用胶粘剂、砂轮专用胶粘剂。其中新型弹性环氧胶粘剂(BS - 2 1 0 1A/B)主要特点是粘度低、操作性能好,配胶简单,使用方便;放热低,使用期长;固化后胶层柔软性极高,伸缩率大,耐冲击性能优良,胶合件应力小;对水、二氧化碳不敏感,没有胺浑浊现象,固化物表面光泽好;固化剂配合比例大,称…     

新型弹性环氧胶粘剂在湖南问世

新一代弹性环氧胶粘剂前不久由湖南省高新技术企业———长沙蓝星化工新材料有限公司开发成功,该产品也　被认定为湖南省高新技术产品。他们生产的新型弹性环氧胶粘剂共包括:新型弹性环氧胶粘剂、室温固化柔韧性环氧胶粘剂、滴塑水晶硬质胶　粘剂、滴塑水晶软质胶粘剂(BS - 2 10 1A/B)主要特点是粘度低、操作性能好,配胶简单,使用方便;放热低,使用期长;　固化后胶层柔软性极高,伸缩率大,耐冲击性能优良,胶合件应力小;对水、二氧化碳不敏感,没有胺浑浊现象,固化　物表面光泽好;固化剂配合比例大,称量误差带来的影响小;低毒低刺激性,对操作…     

专利介绍

<正>单组分室温固化柔弹性环氧导电银胶 CN 1632032(2005-06-29)。在常温下,将质量比为100份环氧当量在200-250的双酚A环氧树脂,5-30份环氧当量在120-150的多环氧基团环氧树脂,50-800份固化剂,50-500份乙醇充分混合均匀后,加入450-3500份平均尺寸为1-10um的片状银粉,进一步充分混合。该产品室温即可固化,24h 内可以固化成为粘接强度高,柔弹性优良的产物。     

日本公司研制成功高性能环氧胶

日本合成橡胶公司研制成功一种具有与橡胶相似的挠性和弹性的高性能冷固化环氧胶。这种胶为双组分胶粘剂,以聚酰胺为固化剂,通过特定的交联反应,使环氧树脂得到改性。这种胶具有优异的耐冲击性和剥离强度,在耐水、耐湿、热老化特性和抗剪强度方面均优于传统产品。     

硫酸钙晶须改性环氧建筑胶的研究

采用硫酸钙晶须替代部分填料,研究其掺入量对环氧建筑胶粘度、力学性能和粘接性能的影响。结果表明,硫酸钙晶须的掺入增大了环氧建筑胶的粘度;硫酸钙晶须对环氧建筑胶具有优异的增强作用,可使环氧建筑胶的拉伸、抗弯、压缩强度分别提高34%、37%、17%;硫酸钙晶须的掺入提高了环氧建筑胶的粘接性能,拉伸剪切强度增加最大幅度可达24%。     

化学工业出版社好书推荐

<正>《环氧胶黏剂(第2版)》(第二版)张玉龙主编本书主要对通用环氧胶黏剂、改性环氧胶黏剂、功能环氧胶黏剂、环保环氧胶黏剂和专用环氧胶黏剂的实用配方与制备实例进行介绍。每一例制备实例都对原材料与配方、制备实例、性能与应用等进行了详细论述。书号:9787122295569出版时间:2017年8月定价:88.0元开本:16     

新型单组分弹性环氧胶粘剂

介绍了一种潜伏性的中温固化环氧胶粘剂,该胶固化后具有一定的弹性,良好的粘接性能和耐湿热老化性,贮存期在常温(25℃)约三个月。文中还将此胶的性能与日本进口的同类胶粘剂做了对比。     

汽车用焊装胶的黏度特性在施工性 与贮存稳定性中的影响

胶粘剂由于其自身独特优势,即渗透性低、韧性与弹性好等,在汽车制造中备受青睐,承担十分重要的辅助作用。通过采用旋转黏度计法和压流黏度计法进行焊装胶测量,进一步深入探究了汽车用焊装胶黏度对施工性能与贮存稳定性的影响作用。研究结果表明,由于焊装胶自身特性,环氧折边胶与高强度结构胶的环氧树脂含量比较高,而环氧树脂粘度受温度变化影响比较大,使得年温特性较差,对此,应采取带有保温功能的胶枪或自动打胶机施工;而在贮存时间不断延长的趋势下,焊装胶黏度渐渐上升,特别是环氧折边胶与高强度结构胶,对此,应要求厂家严格确保这两种黏胶的贮存温度控制在既定标准以内。     

广州市华邦化工科技有限公司

<正>主营产品环氧面涂、平涂固化剂环氧底中涂固化剂环氧水晶胶固化剂环氧电子灌封胶固化剂环氧粘接胶固化剂环氧玻璃漆固化剂水性环氧固化剂干挂胶固化剂     

NMR Study of the Epoxy Crosslinking Reactions of N,N-Dimethyl-4-Chlorophenyl Urea

The crosslinking of one-part epoxy adhesives is a complex process involving reactions of dicyandiamide and any of a variety of accelerators with epoxide functional polymers. Variations in adhesive formulation and process affect the final properties of the adhesive bond. The reactions of N,N-dimethyl-4-chlorophenyl urea, an accelerator for one-part, dicyandiamide crosslinked epoxy adhesives has been studied with Carbon-13 NMR in model systems employing phenyl glycidyl ether as the epoxy. A complex reaction mixture was observed whose composition varied with epoxy-accelerator stoichiometry and reaction temperature.

NMR peaks having chemical shifts consistent with 2-N-(4-chlorophenyl)-4-phenoxymethyl oxazolidone, a quaternary amine terminated polyether and epoxy elimination products have been observed in reaction mixtures modeling adhesive formulations. The quaternary amine terminated polyether likely results from condensation of epoxy with the dimethyl amine that is formed from N,N-dimethyl-4-chlorophenyl urea under cure conditions. Of the three products observed, only the quaternary amine terminated polyether would afford crosslinks in the actual adhesive. The other two products would consume epoxide functionality without the concurrent formation of crosslinks. The relative amounts of these three products varied as a function of reaction temperature, suggesting that variations in process conditions may affect final properties of dicyandiamide-crosslinked epoxy adhesives that are accelerated with N,N-dimethyl-4-chlorophenyl urea.     

NMR Study of the Epoxy Crosslinking Reactions of N,N-Dimethyl-4-Chlorophenyl Urea

The crosslinking of one-part epoxy adhesives is a complex process involving reactions of dicyandiamide and any of a variety of accelerators with epoxide functional polymers. Variations in adhesive formulation and process affect the final properties of the adhesive bond. The reactions of N,N-dimethyl-4-chlorophenyl urea, an accelerator for one-part, dicyandiamide crosslinked epoxy adhesives has been studied with Carbon-13 NMR in model systems employing phenyl glycidyl ether as the epoxy. A complex reaction mixture was observed whose composition varied with epoxy-accelerator stoichiometry and reaction temperature.

NMR peaks having chemical shifts consistent with 2-N-(4-chlorophenyl)-4-phenoxymethyl oxazolidone, a quaternary amine terminated polyether and epoxy elimination products have been observed in reaction mixtures modeling adhesive formulations. The quaternary amine terminated polyether likely results from condensation of epoxy with the dimethyl amine that is formed from N,N-dimethyl-4-chlorophenyl urea under cure conditions. Of the three products observed, only the quaternary amine terminated polyether would afford crosslinks in the actual adhesive. The other two products would consume epoxide functionality without the concurrent formation of crosslinks. The relative amounts of these three products varied as a function of reaction temperature, suggesting that variations in process conditions may affect final properties of dicyandiamide-crosslinked epoxy adhesives that are accelerated with N,N-dimethyl-4-chlorophenyl urea.     

耐高温环氧树脂胶黏剂的研究进展

耐高温胶黏剂广泛应用于航空航天、汽车、电子电器等领域,其中环氧树脂胶黏剂具有成本低廉、粘接强度高、综合性能好等优点,经常被作为耐高温胶黏剂的基体,但是固化后的环氧树脂存在耐热性不高等缺点,限制了它的广泛使用。为此,文章介绍了近年来通过无机填料、热塑性树脂、橡胶等方法改性环氧树脂制备耐高温环氧胶黏剂的研究成果,并对其发展前景进行展望。     

双组分环氧胶粘剂在我厂的应用

简单介绍了双组分环氧胶粘剂的特点、组成及固化反应机理 ,并且详细叙述了我厂双组分环氧胶粘剂的组分、配制工艺和灌胶工艺以及讨论了双组分环氧胶粘剂在我厂的应用情况 ,为我厂的军品及民用电器产品的灌封胶接提供了广泛的前景     

聚硫醚改性环氧树脂室温固化耐高温结构胶粘剂

目前室温固化耐高温环氧树脂结构胶粘剂主要采用液体端羧基丁腈橡胶增韧环氧树脂为主体,以改性液体端胺基丁腈橡胶或聚醚胺为韧性固化剂,其最高使用温度仅120℃。聚硫橡胶作为环氧树脂增韧剂和固化剂则由于耐热性能和增韧效果差,很少用于室温固化耐热环氧树脂结构胶粘剂。通过改进聚硫橡胶的内聚强度和耐热性能,作为增韧剂,克服了聚硫橡胶耐热性能和增韧效果差的缺点,大大地提高了室温固化环氧树脂结构胶粘剂的剥离强度,通过BMI与脂肪胺加成反应,并加入叔胺固化剂,合成具有BMI结构和叔胺的固化剂,以及加入有机硅改性石棉,使室温固化环氧树脂结构胶粘剂的耐热性能达到177℃,瞬间使用温度达300℃,达到室温固化高温使用的目的。     

宇航结构胶的发展概况

结构胶黏剂的优异性能使其在宇航领域得到了广泛的应用。主要阐述了结构胶黏剂的发展概况及我国在宇航用结构胶黏剂方面的开发历程和主要成就。结构胶黏剂的发展分为三个阶段,先后为（1）酚醛树脂体系;（2）尼龙-环氧树脂体系;（3）丁腈、聚砜、双马来酰亚胺等改性环氧树脂体系。介绍了我国高中低温多固化体系、胶液、胶膜多品种的开发及其在我国各系列飞机、神州系列航天飞船、嫦娥卫星等的应用情况。     

Parametric study of factors affecting the pull-out strength of steel rods bonded into precast concrete panels

This paper deals with the effect of bond thickness, embedment length and type of epoxy adhesive formulation on the adhesion of steel anchors to concrete. The test results indicate that the shear strength of the epoxy adhesive formulation prepared from a diglycidylether of bisphenol A (DGEBA) and an ethyleneamine curing agent is independent of bond thickness from approximately 1–4 mm. However, the same is not found to be true for the DGEBA epoxy resin cured using an alkylenediamine curing agent where considerably more complex behaviour is observed. The adhesive shear strength of this system is shown to pass through a maximum value at 2 mm bond thickness. At thickness beyond 2 mm, the strength undergoes a reduction until a value is reached which remains essentially constant with increased thickness. The variation in concrete strength is regarded as a main factor responsible for this complexity. The addition of filler to epoxy adhesive formulations results in a reduction in the adhesive shear strength, the magnitude of the decline being largely dependent upon the quantity of filler used in the mixture. The quadratic equations reviewed in this study provide a basis for assessing trends in the mechanical behaviour of filled epoxy systems. The shear strength of an epoxy adhesive anchor can be determined by an elastic behavioural model. The curves for epoxy adhesives indicate that the elastic solution does fit the experimental data very well. Increasing embedment of an anchor beyond a certain point does not increase the ultimate tension capacity of the anchor.     

Fabrication and evaluation of structural film adhesive using oxazolidinone modified novolac epoxy resin

Epoxy film adhesives are of prime importance for the fabrication of lightweight honeycomb structures for aerospace industries. This work involves the synthesis of oxazolidinone modified epoxy novolac resin (EPN-OXA) via the reaction of EPN and toluene diisocyanate. EPN-OXA was characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, gel permeation chromatography, and epoxy equivalent weight. EPN-OXA was blended with solid epoxy resin, polyethersulfone (PES) toughened liquid epoxy resin, dicyandiamide, and aluminum powder to fabricate a film adhesive curing at 170–180 °C. Effect of additives and curative on the adhesive property was studied to optimize the composition. Effect of PES on the optimized composition was studied in detail. The best composition exhibited lap shear strength of 370 ± 10 kgf cm⁻² at 25 °C and the strength was retained to 75% at −196 °C and 52% at 120 °C. PES significantly enhanced the interfacial strength at different temperatures (~1.6-fold at −196 and 25 °C and ~1.8-fold at 120 °C). It also improved tensile strength and fracture toughness by 1.4- and 2-fold, respectively. The toughening effect of PES was further confirmed by scanning electron microscopy images. PES marginally reduced the glass-transition temperature and it exhibited no effect on thermal stability. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47520.     

SiO_2对环氧胶层弹性模量和泊松比的影响

用应变片电测技术研究了SiO2填料对环氧树脂胶层弹性模量的影响,测定了变化SiO2填料添加量时环氧胶层的变形情况。结果表明:在所采取的试验条件下,填料SiO2的添加量小于45％(树脂重)时,增加填料导致其弹性模量明显提高而泊松比减小,添加量为45％时所测得的弹性模量比无填料试样提高了大约22．5％而泊松比降低了约19．4％,分析了弹性模量和线膨胀率对环氧胶层内应力的综合影响。     

公路路面超薄石脂面层胶黏剂拉伸性能及影响机理

超薄石脂面层具有轻薄、抗滑、施工效率高等特性,在路面铺装中已得到广泛应用.通过配合比试验制备了用于公路路面超薄石脂面层铺装的胶黏剂,通过树脂浇铸体拉伸试验研究了不同种类、不同用量的增韧剂、稀释剂和固化剂对胶黏剂拉伸性能的影响,并通过SEM和FTIR试验,探讨了各添加剂对拉伸性能的影响机理.结果表明:超薄石脂面层胶黏剂中A组分(环氧树脂及改性剂)最佳配比为:环氧树脂E-51:环氧树脂E-44:增韧剂F1:稀释剂D1:阻燃剂=50:50:20:10:8,B组分(固化剂及改性剂)最佳配比为:固化剂H1:促进剂:偶联剂=70:10:2;随增韧剂或稀释剂含量的增加,试件抗拉强度先升高后降低,弹性模量持续降低,断裂伸长率则不断升高;胶黏剂固化物抗拉强度为21.83 MPa,拉伸弹性模量为0.47 GPa,断裂伸长率为38.24％;增韧剂中聚氨酯与环氧树脂相互缠绕、贯穿成网络结构,出现互穿包容效应,起到增韧作用,稀释剂通过降低胶黏剂的交联密度来增进延展性,固化剂中氨基与环氧基发生固化反应.