厌氧胶用特种清除剂

介绍了一种适用于ＧＹ厌氧胶固化物的特种清除剂,它对拆卸后零件表面的固化物有良好的清除效果,为机械工业零件的再次装配使用提供了一种可以使用的国产新材料。     

高性能厌氧胶

由大连瑞华实业有限公司研制开发生产的高性能厌氧胶，它除了具有普通型厌氧胶的通性外，还具备了耐高温的特性，它具有很高的软化点和稳定的化学基团。其生产工艺先进，性能达到了世界同类同用途胶种的水平。在高温时，其力学性能一套压剪切强度，达到了美国乐泰型号产品的标准。该胶不含溶剂，具有单组分，强度高。应用温度范围广，使用方便等优点。高性能厌氧胶，不但有厌氧胶的通性，并且具有高强度，     

浅述厌氧胶螺纹锁固防松工艺

浅述厌氧胶螺纹锁固防松工艺孙康（江西拖拉机厂，南昌市．３３０００２）一、前言厌氧胶密封粘接因其工艺简单，适应面广，效果显著而广泛地应用于机械行业。现已成为螺纹锁固和密封的重要手段。厌氧胶固化时，能在螺纹缝隙形成一热固性胶层，使螺纹面啮合率达百分之百而...     

厌氧密封粘合剂稳定性探讨及其贮存期初步预测

一、前言优质的厌氧密封粘合剂(简称厌氧胶)必须具有快速固化和贮存稳定等性能。国外,厌氧胶的固化速度和贮存稳定性方面的研究发展很快。已达到对撞瞬间固化和高稳定性。国内近几年也出现了不少性能优异的胶种,但厌氧胶的贮存稳定性却仍是重要的研究课题。     

GY—340单组份快固化厌氧胶

厌氧性密封胶粘剂(简称厌氧胶)是一种重要的工业用胶粘剂,它已有二十多年的发展历史,到七十年代国外已出现了一系列规格较完备的机械用(锁固、密封及装配)单组份厌氧胶(其中许多是属于室温快速固化胶,即可在1至6小时完成固化).近年来,作为结构粘接用厌氧胶投入市场的也有     

乐泰厌氧胶在设备修理中的应用

中国烟台引进美国LOCTITE厌氧胶技术生产的乐泰厌氧胶,经我们在设备修理中多次使用,收到较好的效果。乐泰厌氧胶种类很多,乐泰(中国)厌氧胶按其作用不同可分为: 1、螺蚊锁固胶,用于螺纹防震防松。 2、密封胶,可以代替纸垫、垫片等起密封作用。 3、机件固持胶,如轴承、轴承磨损,用固持胶填补和固持磨损造成的间隙和松动。 4、粘接和密封其它材料,如各类金属、玻璃、陶瓷、磁铁等。我们首次使用的乐泰厌氧胶是609固持胶。我公司生产车间在检修5吨天车故障时,发现电机轴与滚动轴承配合部位严重磨损,     

“微胶囊厌氧胶”等项目在杭通过鉴定

<正> 由浙江省机械研究所承担的机械部下达的“微胶襄厌氧胶及其应用研究”,“厌氧胶在螺纹防松粘接和密封中应用研究”二个课题,于1985年12月18日由机械部机械院、浙江省机械厅主持,通过了鉴定。同时通过了对“受压铸件浸渗和胶接密封剂应用”推广课题的评审。与会代表认为微胶襄厌氧胶 Zy—N1的研制成功,为我国厌氧胶提供了一种很有发展前途的新产品。代表们对该所用横向冲击振动试验评定厌氧胶的防松可靠性,用湿热老化、冷热交变等试验评定厌氧胶的耐久性能给予充分的肯定,与会代表,对该所的厌氧胶推广工作,取得数百万元的社会经济效益表示赞尝。     

厌氧胶单体结构与胶性能的关系

本文在概述厌氧胶的组分暨基本单体结构类型之后,用较大篇幅在综合分析国际近期文献的基础上讨论了厌氧胶单体结构与胶性能的关系,并从自己的试验结果出发,研究了缩乙二醇系列甲基丙烯酸双酯中不同乙二醇聚合度对其厌氧胶性能的影响。     

螺纹锁固用厌氧胶的评价指标和应用特点

介绍了螺纹锁固用厌氧胶的密封原理,总结了厌氧胶的常用评价指标(扭矩、固化速率、耐热温度和黏度等)及现有厌氧胶的种类与性能(包括乐泰厌氧胶、GY系列厌氧胶、J系列厌氧胶和其他厌氧胶产品),并讨论了厌氧胶的清除技术(包括螺纹件的拆卸、残余厌氧胶的清除等)。最后展望了厌氧胶的发展方向。     

一种光敏性（甲基）丙烯酸酯的研究

本文试验一种在分子内具有安息香醚基团结构的（甲基）丙烯酸酯树脂，并将此具有光敏引发作用的（甲基）丙烯酸酯树脂（ＢＥＡ）应用于光敏性厌氧胶之中，在销固用甲基丙烯到砂氧胶中加入光敏树脂（ＢＥＡ）后，测试结果表明，即使销固用厌氧胶保持原有的厌氧固化性能，而且ＵＶ照射时表层可以固化并加快了室温下的固化速度。     

Antimicrobial activity,effects on Streptococcus mutans biofilm and interfacial bonding of adhesive systems with and without antibacterial agent

ObjectivesThis study evaluated the antimicrobial activity (by agar disk diffusion test, AD), viability of S. mutans biofilm (VB), and effect on resin-dentin interface (RDI) of six adhesive systems.MethodsThree adhesives containing antibacterial components (Gluma 2Bond (G2B)/glutaraldehyde, Clearfil SE Protect (CSP)/MDPB and Peak Universal Bond (PUB)/chlorhexidine) and the corresponding adhesives with similar composition, but without antibacterial agents (Gluma Comfort Bond, GCB; Clearfil SE Bond, CSB and Peak LC Bond, PLB) were evaluated. AD was determined measuring the extent of halo formation following application of adhesives and control groups (light cured or not) to cultures of four strict anaerobic and four facultative bacteria. For VB, a UA159 biofilm was grown on adhesive-coated hydroxyapatite discs for five days, collected and processed to count the number of viable cells. For RDI analysis, adhesives were applied according to manufacturers' recommendations and teeth were restored with resin composite, sectioned to obtain bonded slices and visualized by SEM.ResultsAn inhibition halo was observed for G2B (strict anaerobic/light cured and not light cured), CSP (strict anaerobic and facultative/light cured and not light cured) and PUB (strict anaerobic and facultative/not light cured). PUB when light cured produced an inhibition halo on L. casei and S. mutans only. G2B and CSP significantly reduced the viability of S. mutans. Adhesives containing antimicrobial compounds had no detectable effect on RDI.ConclusionThe MDPB-containing bonding agent showed better results of inhibition for all oral pathogens tested and a decrease of viability of Streptococcus mutans biofilm, among the adhesives tested.     

Glutaraldehyde-wheat gluten protein adhesives for wood bonding

ABSTRACT

Wheat gluten protein hydrolysate was used as a biomass feedstock to prepare environmentally friendly protein-based adhesives, with hydrolyzed wheat protein as control. Glutaraldehyde was used to modify it to obtain a glutaraldehyde-wheat protein (GP) adhesive. Polyethylenimine (PEI) was also used as a crosslinking agent. Plywood has been prepared and tested, and its performance was used to measure the wheat gluten protein hydrolysate adhesive bonding performance. Differential scanning calorimetry (DSC) and thermomechanical analysis (TMA) were used to analyze the adhesive thermal properties and the microstructures of the cured adhesives by scanning electron microscopy (SEM). The results show that modification by glutaraldehyde can effectively improve the bonding performance of wheat protein adhesives, the plywood bonded strength having been improved by its addition. The effect of PEI as a crosslinking agent became evident. It can greatly improve the bonding properties of glutaraldehyde-modified wheat protein adhesives. TMA analysis indicates that the glutaraldehyde-modified GP adhesive has a higher storage modulus than the unmodified one. The modulus of the adhesive increased after adding the PEI cross-linking agent.     

The Fracture Mechanics of the Pin and Collar Test for High Temperature Anaerobic Adhesives

A mechanical test method for the studies of high-temperature anaerobic adhesives has been established, based on fracture mechanics, by modifying the standard test method of collar and pin test. Linear Elastic Fracture Mechanics approach was applied to the establishment of the relationship between adhesive fracture surface energy “R”, fracture load and crack length. Hence, from the joints containing a given artificial flaw the adhesive fracture surface energy can be determined; alternatively, from the strength of the joints without artificial flaws the inherent flaw size “a_i” can be calculated to account for the decrease of joint strength.

The experimental techniques were applied to examine the mechanical behaviour of the joint system based on high temperature anaerobic adhesives. It was found that the joints cured at room-temperature had higher adhesive fracture surface energy but lower joint strength than the joints postcured at high temperatures. The “a_i” data explained this interesting phenomenon. The joints cured at room-temperature had extraordinarily large “a_i”, which was found to be formed by the uncured adhesive near the edges of the joints and the adhesive further cured in the postcure processes to reduce the “a_i”. Also, the growth of intrinsic flaw was found to be responsible for the deterioration of the joints in a short-term, high-temperature ageing process.     

不干胶专用清洁剂的研制

在展览馆中大量使用不干胶进行布置和装饰,这样会在装饰板、间隔板及墙面板上留下很多不干胶贴纸和胶渍,但如果使用汽油作为不干胶的去除洗涤剂,存在安全隐患。本文介绍了一种不干胶清洁剂,可代替汽油作为清洁剂,该清洁剂为水基清洁剂,产品不易燃、无毒、使用方便,既安全又环保,有效去除因展览装饰板、间隔板及墙面板上留下的不干胶贴纸和胶渍;推荐了不干胶清洁剂的优化配方。     

Adhesive Bonding of Clean and Oil-Contaminated Electrogalvanized Steel Substrates

The performance of two-part, amidoamine-cured epoxy adhesives on clean and oil-contaminated electrogalvanized steel (EGS) was studied using screening and lap shear tests. On exposure to boiling water, the cured epoxy adhesives with amidoamines having higher amine value delaminated from the clean and oil-contaminated EGS surfaces before those cured with amidoamines having low amine value. The results of X-ray photoelectron spectroscopy (XPS) showed that the adhesives cured with amidoamines having high amine value were unable to displace the oil from the EGS substrate. However, the durability and the strength of the adhesive bonds on the oiled EGS could be improved by adding proper amounts of silane or wetting agent to the adhesive. The preferential adsorption of amino curing agents occurred on the clean EGS surface, confirmed by XPS and reflection absorption infrared spectroscopy, and this decreased the durability of the bonds in boiling water. In addition, from XPS analyses of various specimens, different amounts of cured resins were detected in the adhesive/EGS interfacial regions which affecting the durability of the adhesive bonds. In addition, the amidoamine curing agents may form complexes on the EGS surface.     

硅笼改性耐热厌氧胶的制备及其固化动力学

为提高厌氧胶的热性能,用二步法合成了邻甲酚醛环氧丙烯酸酯(o-CFEAR),并以该树脂为单体,不饱和笼型倍半硅氧烷(POSS)为耐高温改性剂,选择合适的氧化还原体系及其它助剂,制成耐高温厌氧胶,测定了相关性能,研究了该胶的固化动力学。结果表明,此厌氧胶剪切强度最高达15.3 MPa,在200℃、96 h时剪切强度保持率为87%左右,耐高温性能良好;固化过程的反应级数为1.084 9,表观活化能为86.86 kJ/mol。     

UV curable pressure‐sensitive adhesives for fabricating semiconductors. II. The effect of functionality of acrylate monomers on the adhesive properties

In an attempt to control the adhesive properties of acrylic copolymer‐based pressure‐sensitive adhesives, a series of multifunctional acrylate monomers were added and UV cured. The adhesive compound with a difunctional monomer had increased peel strength after UV curing. On the other hand, the compound with a tri‐ or more functional (polyfunctional) monomer had markedly decreased strength after UV curing. Those adhesives containing any polyfunctional monomer also showed much higher storage modulus than an adhesive containing a difunctional monomer. The greater volume contraction of UV‐cured polyfunctional monomer suggested microvoids at the interface between the adhesive layer and the adherent, resulting in poor strength. Estimated values of the peel strength of UV‐cured adhesives according to the theoretical equations proved that the strength is approximately inversely proportional to the elastic moduli. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2889–2895, 2004     

New two-part epoxy paste structural adhesives for a thick bondline

The properties of three different adhesive pastes J-101, J-114, and EA9309.3N/A are evaluated. These adhesives are two-part thermosetting pastes which can be cured at 80-90°C and are designed for inlay or dowel bonding application, and thus are especially suitable for a bondline thickness from 0.8 to 1.6 mm. The compositions are based on CTBN-modified DGEBA and multicomponent polyamine curing agent systems. Durability and fatigue life tests are also discussed. The microstructure and fracture behavior of these adhesives is studied by scanning electron microscopy (SEM). Different toughening mechanisms are proposed to account for the toughness of these adhesives. The experimental results show that both J-101 and J-114 adhesives develop good mechanical properties when cured at 80-90°C. Furthermore, their durability performance compares favorably with, or even exceeds, that of commercially-available EA9309.3N/A adhesive.