西卡推出新型建筑用胶粘剂

<正>西卡公司的零售事业部最近推出一款强力快抓胶粘剂(Sika Bond Ultimate Grab)。该款胶粘剂是单组分、湿固化的快粘型聚氨酯胶粘剂,可用于粘接各种内外部建筑材料,尤其适用于垂直应用。使用该款胶粘剂后无需再使用钉子和螺丝,并且该胶粘剂功能多样、适用范     

塑料地板胶粘剂召开鉴定会

塑料地板胶粘剂技术鉴定会于1986年4月21日召开,一致通过了鉴定。广州市化工研究所研制的塑料地板胶粘剂,是以聚醋酸乙烯酯为粘料,与酒精、填料等配制而成的单罐装胶粘剂,适用于其中一被粘面是     

定向刨花板用PF树脂胶粘剂特性的研究

研究了适用于定向刨花板的ＰＦ树脂胶粘剂的特性，并计算了ＰＦ树脂胶粘剂固化反应的表观活化能。     

工程胶粘剂的现状与展望

工程胶粘剂与以往各时代胶粘剂的不同之处在于适用于异种非多孔材料的粘接。预计它将出现极大的增长。本文介绍了几种主要的工程胶粘剂的特点、现状和发展趋势,并指出了工程胶粘剂未来的研究课题。     

TM型导热胶粘剂的研制

根据石化工程的需要我们研制出二种型号的导热胶粘剂。TM－I型是无机型导热胶粘剂，其主要成份为鳞片状石墨及硅酸盐类无机胶粘剂。该种胶粘剂导热系数大，传热效率高，适用温度范围广（－190～370℃），但耐水性较差。适用于有防水措施的室外及室内装置上的伴热系统。TM－11型是有机型导热胶粘剂，是以高纯度结晶型石墨为导热材料，以有机高分子物质为粘接剂，并加入其他适量助剂而制成的一种单组份导热材料。该种导热胶粘剂化学稳定性好，强度高，耐水性好，贮存及施工方便，可在～190～190t温度范围内使用，适用于室内外有关装置或管路…     

GB 18583-2001《室内装饰装修材料 胶粘剂中有害物质限量》

1范围 本标准规定了室内建筑装饰装修用胶粘剂中有害物质限量及其试验方法. 本标准适用于室内建筑装饰装修用胶粘剂.     

瓦克推出新型芳基烷氧基硅烷

<正>瓦克化学集团近日推出一种新型芳基烷氧基硅烷单体GENIOSIL XL70。该产品是瓦克专门针对硅烷交联型胶粘剂及密封胶设计而成的,尤其适用于不允许散发异味的产品。GENIOSIL XL70是一种低黏度、透明且无色的芳基烷氧基硅烷类液态产品,与传统的硅烷交联型胶粘剂及密封胶用去水剂不同,该产品能配制出无异味的地板胶粘剂或液体防水涂料等产品,特别适用于大面     

花生壳提取物制造木材用胶粘剂

利用花生壳提取物制造木材用胶粘剂,其性能比良,适用于人造板的制造。     

一种新型聚氨酯弹性体的应用及发展

西德Iromer化学厂研制成功一种被称为Irostic 240型的胶粘剂,适用于制备水材、橡胶、PVC、塑料等不同领域用的胶粘剂。Irostic 240型胶粘剂是聚氨酯胶粘剂的发展。文中详细介绍Irostic 240的化学结构、密度、粘度、贮存性能、加工安全性、溶解     

波士胶对华发力携胶粘剂新品拓展建筑市场

正全球领先的建筑、消费和工业市场胶粘剂专家波士胶,将发布适用于建筑领域的一系列胶粘剂解决方案,大力拓展其在华业务。公司将于7月8日在上海外滩举办大型活动,发布针对绿色建筑和建筑工业化的创新型胶粘剂技术。作为阿科玛集团旗下专业的胶粘剂公司,波士胶进入中国已有近20年的时间,于1998年在广州成立了第一家     

RPUR泡沫塑料/铝板粘接性能的影响因素探讨

主要研究了硬质聚氨酯(RPUR)泡沫塑料的密度、异氰酸酯指数、铝板表面处理方式及铬酸阳极化处理后存放时间等因素对RPUR泡沫塑料／铝板粘接性能的影响。研究结果表明,RPUR泡沫塑料／铝板的粘接强度随RPUR泡沫塑料密度的增加而增大,在实验范围内随异氰酸酯指数的升高而降低,当铝板表面采用铬酸阳极化处理时,其与RPUR泡沫塑料之间的粘接性能最好,而且经过铬酸阳极化处理的铝板在存放160d后其粘接效果仍然较好。     

水性纸塑复膜胶的研究进展及发展动向

水性纸塑复合胶粘荆是现代包装行业应用较为广泛的一种新型胶粘荆，其种类较多。文着重介绍了几种水性复膜胶及其研究进展。     

Effect of Adhesive Thickness on Transverse Low-Speed Impact Behavior of Adhesively Bonded Similar and Dissimilar Clamped Plates

This study investigates the effect of adhesive thickness on the transverse low-speed impact behavior of adhesively bonded similar (Al–Al, St–St) and dissimilar (Al–St, St–Al) clamped plates using the three-dimensional explicit finite element method. The contact force and plastic dissipation histories are studied for various impact energies and adhesive thicknesses. The residual plastic strains in both adhesive layer and the two plates increase with increasing impact energy. The central transverse deflections become maximal in Al–Al, moderate in Al–St, St–Al and minimal in St–St bonded plates. The back plates of all configurations deform noticeably. The stiff steel plate results in a shorter contact time, a higher contact force, a lower plastic dissipation energy and the impact energy is absorbed by the adhesive layer rather than by the front and back plates, whereas Al–Al plates dissipate it as much as the adhesive layer. The total contact time gets longer with increasing impact energy. St–St bonded plates experience larger damaged regions in both plates and adhesive layer than those in Al–Al bonded plates. The adhesive thickness has only a minor effect on the magnitude of the contact force and contact time, whereas a stiffer (St) front or back plate affects considerably the contact force and total contact time. Increasing the adhesive thickness decreases apparently residual plastic strains in plates and the adhesive layer, the central transverse deflection. A thick adhesive layer results in a minor increase in the kinetic energy of impactor, a shorter total contact time, a lower plastic dissipation energy and smaller damaged areas on the back faces of the lower plate, along the adhesive–plate interfaces.     

电子行业用聚酯热熔胶的制备及其性能研究

以玻璃化转变温度较低的共聚酯制备了聚酯热熔胶。研究结果表明:聚酯热熔胶对丙烯腈-丁二烯-苯乙烯共聚物(ABS)、聚碳酸酯(PC)等极性塑料与金属材料具有良好的粘接性能,稳定后的剥离强度大于100N/25mm;同时,具有良好的耐老化性能及粘接持久性。聚酯热熔胶可取代国外产品用于电子行业用极性聚合物与金属材料粘接。     

乳液型纸塑复膜胶研究新进展

摘 要 概述了国内外纸塑复膜胶的研究现状，着重论述了乳液纸塑复膜胶的制备工艺，基础理论以及应用近况，展示了今后的研究方向及有待改进的方面。     

聚丙烯酸酯改性淀粉标签胶的研制与应用

介绍了一种纸/塑粘合剂的制备方法,该粘合剂主要由聚丙烯酸酯改性淀粉组成,与同类产品相比,它具有成本低,无毒无污染和粘接性好等优点,广泛用于塑料包装行业的商标粘贴。     

单组分丙烯酸酯乳液复膜胶的研制

采用预乳化半连续乳液聚合工艺,合成了一种丙烯酸酯乳液复膜胶,探讨了单体、乳化剂、增黏树脂乳液及熟化时间等对复膜胶复合强度的影响以及功能单体、乳化剂对黏度的影响。结果表明:BA/EA为10/7,AN/MA为3/6,HPA为4份,β-CEA为5份时,复膜胶的复合强度最好;乳液复膜胶的黏度随功能单体β-CEA、HPA和乳化剂用量的增加而增大。所合成的复膜胶用于包装和印刷行业的塑塑、铝塑及纸塑复合,剥离强度大于2.0N/15mm。     

A Survey of Rheological Properties of One-Component Epoxy Adhesives

Flow characteristics of seven commercially available one-component epoxy adhesive pastes were measured using a controlled shear stress rheometer and a controlled shear rate rheometer over a temperature range from 5°C to 60°C. Combining data obtained from both controlled rate and controlled stress experiments over a wide range of shear rates, we observed Newtonian flow (shear stress proportional to shear rate) at very low shear rates, a plateau “shear thinning” region at intermediate shear rates, and a second region of linear dependence of shear stress on shear rate at high shear rates. The adhesive pastes exhibited a very broad range of rheological behavior. Two flow parameters important to adhesive application technology, the plastic viscosity and the apparent yield stress, were measured for each adhesive. The plastic viscosity ranged from 11.6 to 329.5 Pa. s; the apparent yield stress ranged from 56.2 to 413 Pa. The temperature dependence of the rheological parameters of the epoxy adhesive pastes was also determined. The results are reported as the activation energies, E_η and E_σ, of plastic viscosity and apparent yield stress, respectively. The apparent yield stress of each adhesive paste was much less sensitive to changes in temperature than was the plastic viscosity. This suggests that the processing characteristics are likely to show qualitative as well as quantitative changes with temperature.     

Morphology and fracture properties of pure and reinforced aluminum-epoxy adhesive joints

Several types of nonreinforced and reinforced epoxy-aluminum adhesive joints were prepared and investigated. High modulus carbon fibers and hollow glass microspheres were used as reinforcement. The amount of curing agent, postcure time, adhesive thickness, and type and amount of reinforcement were varied throughout this study, and their effect on fracture energy was determined. Unstable crack propagation through the adhesive layer was observed. Nodular morphology typified all fracture surfaces of nonreinforced adhesive joints, indicating the existence of an inhomogeneous thermosetting network. Electron microscopic evidence was obtained for plastic flow in crack initiation and crack arrest regions. The nature of this plastic flow was discussed in terms of changes in the resin morphology.     

THE DEVELOPMENT OF A MANDREL PEEL TEST FOR THE MEASUREMENT OF ADHESIVE FRACTURE TOUGHNESS OF EPOXY–METAL LAMINATES

A mandrel peel test is established for measuring the adhesive fracture toughness of a metal/rubber-toughened epoxy laminate system. By adopting an energy balance analysis it is possible to determine directly both adhesive fracture toughness and plastic work in bending the peel arm around the mandrel. The suitability of the procedure is examined for various types of metal peel arms, which are classified in terms of their ability to deform plastically during the test. The plastic work is also predicted theoretically, and comparisons are made between the measured and calculated values. The fracture energies determined from the mandrel tests are compared with those obtained from 90° fixed-arm peel tests. For the calculations of plastic work in bending in the fixed arm test, various options are used when modelling the tensile stress-strain behaviour of the peel arm material. In addition, the adhesive layer thickness is considered in terms of its influence on the calculation of adhesive fracture toughness.