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热硫化硅橡胶与合金铝粘接的研究 总被引:1,自引:0,他引:1
研究了影响热硫化硅橡胶与合金铝粘合剪切强度的几个因素。结果表明:表面处理方法、工艺条件、硅烷偶联剂和环境湿度等不同程度影响硅橡胶与合金铝粘合剪切强度。红外线辐照处理和硅烷偶联剂对剪切强度有较大贡献、较低的环境湿度有利于提高剪切强度。 相似文献
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热硫化硅橡胶与合金吕粘接的研究 总被引:1,自引:1,他引:0
研究了影响热硫化硅橡胶与合金吕粘合剪切强度的几个因素。结果表明:表面处理方法、工艺条件、硅烷偶联剂和环境温度等不同程度影响硅橡胶与合金吕粘合剪切强度。红外线辐照处理和硅烷偶联剂对剪切强度有较大贡献、较低的环境湿度有利于提高剪切强度。 相似文献
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从拉伸强度,硬度,扯断伸长率的变化及粘合强度等方面研究了用硅氮化合物交联剂硫化的室温硫化硅橡胶的力学性能,并与用Si(OEt)4交联的硫化胶相比较,前者在350℃仍能保持较好的力学性能,具有很好的热稳定性,而后者在250℃时力学性能下降40%左右;而且前者对金属和高分子材料的粘合强度比后者提高3-7倍。讨论了催化剂,胶料对硫化胶力学的性能的影响。 相似文献
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硅橡胶及其玻璃布复合体低温力学性能的研究 总被引:3,自引:0,他引:3
研究了低苯基硅橡胶( MPQ120 - 1) 硫化胶及其玻璃布复合体在- 100 ℃~25 ℃温度区间内的力学性能,发现在结晶温度附近,硫化胶及其复合体的拉伸强度和扯断伸长率分别达到最高和最低值。硅橡胶的低温结晶使硫化胶回弹性迅速降低。 相似文献
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低压缩永久变形氟橡胶与铝合金粘合的研究 总被引:4,自引:0,他引:4
研究KH550、KH560、A-151三种硅烷偶联剂以及TAIC和2,5-二甲基-2,5-二叔丁基过氧己烷硫化助剂对低压缩永久变形氟橡胶胶料硫化的影响,分析了上述五种材料有机官能团参与交联反应的活性。采用以KH560为主配制的胶粘剂可良好地将铝合金与低压缩永久变形氟橡胶粘接,同时对铝合金表面的处理作了一定的研究,解决了目前快速硫化的低压缩永久变形氟橡胶与铝合金粘接的难点。 相似文献
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选用国内性能良好的硅橡胶胶料,采用90°剥离粘合测试方法,对两种进口热硫化型胶粘剂 Thixon304 和 Chemlok 608 用于硅橡胶与金属的粘合进行了对比分析。结果表明,两种胶粘剂都能提高粘合性能,经二段硫化后的粘合强度高于一段硫化; Chemlok 608 的涂刷明显性不如 Thixon 304 ,但贮存期比 Thixon 304 长,二者的使用成本基本相近。 相似文献
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Cheng-Le Zhao Shane Porzio Alan Smith Haiyan Ge H. T. Davis L. E. Scriven 《Journal of Coatings Technology and Research》2006,3(2):109-115
Despite its industrial importance, the subject of freeze-thaw (F/T) stability of latex coatings has not been studied extensively.
There is also a lack of fundamental understanding about the process and the mechanisms through which a coating becomes destabilized.
High pressure (2100 bar) freezing fixes the state of water-suspended particles of polymer binder and inorganic pigments without
the growth of ice crystals during freezing that produce artifacts in direct imaging scanning electron microscopy (SEM) of
fracture surfaces of frozen coatings. We show that by incorporating copolymerizable functional monomers, it is possible to
achieve F/T stability in polymer latexes and in low-VOC paints, as judged by the microstructures revealed by the cryogenic
SEM technique. Particle coalescence as well as pigment segregation in F/T unstable systems are visualized. In order to achieve
F/T stability in paints, latex particles must not flocculate and should provide protection to inorganic pigment and extender
particles. Because of the unique capabilities of the cryogenic SEM, we are able to separate the effects of freezing and thawing,
and study the influence of the rate of freezing and thawing on F/T stability. Destabilization can be caused by either freezing
or thawing. A slow freezing process is more detrimental to F/T stability than a fast freezing process; the latter actually
preserves suspension stability during freezing.
Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, October 27–29, 2004 in Chicago,
IL. Tied for first place in The John A. Gordon Best Paper Competition. 相似文献
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Ethanol and (−)-α-Pinene: Attractant Kairomones for Bark and Ambrosia Beetles in the Southeastern US
In 2002–2004, we examined the flight responses of 49 species of native and exotic bark and ambrosia beetles (Coleoptera: Scolytidae
and Platypodidae) to traps baited with ethanol and/or (−)-α-pinene in the southeastern US. Eight field trials were conducted
in mature pine stands in Alabama, Florida, Georgia, North Carolina, and South Carolina. Funnel traps baited with ethanol lures
(release rate, about 0.6 g/day at 25–28°C) were attractive to ten species of ambrosia beetles (Ambrosiodmus tachygraphus, Anisandrus sayi, Dryoxylon onoharaensum, Monarthrum mali, Xyleborinus saxesenii, Xyleborus affinis, Xyleborus ferrugineus, Xylosandrus compactus, Xylosandrus crassiusculus, and Xylosandrus germanus) and two species of bark beetles (Cryptocarenus heveae and Hypothenemus sp.). Traps baited with (−)-α-pinene lures (release rate, 2–6 g/day at 25–28°C) were attractive to five bark beetle species
(Dendroctonus terebrans, Hylastes porculus, Hylastes salebrosus, Hylastes tenuis, and Ips grandicollis) and one platypodid ambrosia beetle species (Myoplatypus flavicornis). Ethanol enhanced responses of some species (Xyleborus pubescens, H. porculus, H. salebrosus, H. tenuis, and Pityophthorus cariniceps) to traps baited with (−)-α-pinene in some locations. (−)-α-Pinene interrupted the response of some ambrosia beetle species
to traps baited with ethanol, but only the response of D. onoharaensum was interrupted consistently at most locations. Of 23 species of ambrosia beetles captured in our field trials, nine were
exotic and accounted for 70–97% of total catches of ambrosia beetles. Our results provide support for the continued use of
separate traps baited with ethanol alone and ethanol with (−)-α-pinene to detect and monitor common bark and ambrosia beetles
from the southeastern region of the US. 相似文献
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Dongjiang Yang Yao Xu Lei Zhang Shangru Zhai Dong Wu Yuhan Sun 《Journal of Coatings Technology and Research》2006,3(2):127-131
A highly moisture-proof polysilsesquioxane coating was obtained from a new bis-silylated precursor, which was synthesized from 3-aminopropyltriethoxysilane (APTES) and m-xylylene diisocyanate (m-XDI) in tetrahydrofuran (THF) and verified by 1H MAS NMR. For direct comparison purposes, an SiO2 coating was also prepared by the Stöber method using tetraethoxysilane (TEOS) as the reactant. Interestingly, the coating obtained from the polysilsesquioxane sol exhibited a much higher moisture resistance capability than its counterpart, which was attributed to its more compact feature between nanoparticles as characterized by N2 absorption experiment and transmission electron microscopy (TEM). Furthermore, its high transparency of about 92% showed potential for application in the protection of optical crystals. 相似文献
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Peter A. Edwards Grant Striemer Dean C. Webster 《Journal of Coatings Technology and Research》2005,2(7):517-527
Glycidyl carbamate chemistry combines the excellent properties of polyurethanes with the crosslinking chemistry of epoxy resins.
Glycidyl carbamate functional oligomers were synthesized by the reaction of polyfunctional isocyanate oligomers and glycidol.
The oligomers were formulated into coatings with several amine functional crosslinkers at varying stoichiometric ratios and
cured at different temperatures. Properties such as solvent resistance, hardness, and impact resistance were dependent on
the composition and cure conditions. Most coatings had an excellent combination of properties. Studies were carried out to
determine the kinetics of the curing reaction of the glycidyl carbamate functional oligomers with multifunctional and model
amines. Detailed kinetic analysis of the curing reactions was also undertaken. The results indicated that the glycidyl carbamate
functional group is more reactive than a glycidyl ether group.
Presented at the 82nd Annual Meeting of the Federation of Societies for Coatings Technology, on October 27–29, 2004, in Chicago,
IL. 相似文献
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M. S. J. Simmonds W. M. Blaney F. Delle Monache M. Marquina Mac-Quhae G. B. Marini Bettolo 《Journal of chemical ecology》1985,11(12):1593-1599
Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria. 相似文献
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