非电晕处理光学级BOPET预涂膜用水性在线涂布液的制备及性能研究

采用水性聚氨酯树脂为主要成膜物,与水性封闭型异氰酸酯交联剂、表面润湿助剂、防粘连剂以及消泡剂等配合,制备了非电晕处理光学级双向拉伸聚酯薄膜(BOPET)预涂膜用水性在线涂布液。研究了主要成膜物、交联剂、各类助剂以及涂布液固含量等对涂布液及其预涂膜性能的影响。研究表明:该水性涂布液能够满足在线涂布的工艺要求。采用该涂布液制备的预涂膜具有优异的光学性能和表观状态,与非电晕处理光学级BOPET以及表面多种功能性涂层在高温高湿环境下均具有良好的附着性能。     

聚氨酯丙烯酸水性木器涂料附着力影响因素的研究

以水性聚氨酯丙烯酸酯乳液(PUA)为基料配制水性木器涂料。从润湿与附着的角度考察了乳液种类、涂布量、基材润湿剂、附着力促进剂、成膜助剂等对PUA涂膜附着力的影响。结果表明:PUA乳液表面张力越低,润湿性越好,PUA涂膜附着力越强;涂布量增加,涂膜厚度增加,涂膜附着力降低;加入0.6%~0.8%(质量分数)基材润湿剂可明显提高涂膜附着力;附着力促进剂硅烷偶联剂能有效提高涂膜附着力;成膜助剂也对涂膜附着力有影响。     

导读

正杨金星等优选水性含氟乳液为主要成膜物,以金红石钛白粉、滑石粉为填料,搭配适当的分散剂、pH调节剂、润湿剂、増稠剂等功能助剂,最终研制了一款生产成本低、耐候性优异、耐沾污性能突出等独特性能优势的水性外墙氟碳涂料。试验过程分析了水性含氟乳液含氟量和用量、颜填料选择、颜料体积浓度等体系配方变化对水性外墙氟碳涂料性能的影响。     

水性木器封闭底漆的配方探讨

为了解决水性木器色漆涂膜快速变色的问题,使用水性封闭底漆是一种简单有效的方法。测试了封闭底漆中不同水性成膜物、助溶剂、底材润湿剂对封闭性能的影响,探讨了水性木器涂料变色的原因。     

强制干燥型水性木器涂料的配方设计及涂装应用

阐述了水性木器涂料的强制干燥方式;从树脂、成膜助剂、润湿剂等方面研究了烘烤型水性木器涂料的配方设计。较详细地介绍了烘烤型水性木器涂料的涂装应用。     

中草药防蚊虫水性涂料及其制备方法

<正>本发明提供了一种中草药防蚊虫水性涂料及其制备方法,所述中草药防蚊虫水性涂料含有中草药复合提取液、中草药复合粉、成膜物质和水,进一步所述中草药防蚊虫水性涂料还可添加有润湿剂、胺中和剂、分散剂、颜填料、硅藻土、消泡剂、流平剂、增稠剂、杀菌剂、成膜助剂中的一种或多种。所述中草药防蚊虫水性涂料是通过将中草药复合提取液和     

金属表面防护用水性涂料的工艺技术研究

通过对金属表面防护用水性涂料的关键技术进行研究,采用引入含小分子环氧基团单体,制备的金属表面防护用水性丙烯酸分散体作为成膜物。通过对金属表面防护用颜料、助剂和助溶剂的选择性研究,确定了最佳工艺条件:水性丙烯酸分散体为54%、润湿剂为0.2%、消泡剂为0.3%、流平剂为0.5%。本产品VOC<10%,水性环保、防腐耐候、施工方便,无论是性能特征还是现场操作性,均可满足客户要求,对金属表面防护用涂料行业的水性化发展具有深远意义。     

一种性能优良的国产双组分水性聚氨酯涂料的研制

用国产水性羟基丙烯酸分散体为主要成膜物,配以国产水性异氰酸酯固化剂,选用消泡剂、水性润湿剂、流平剂等国产原料研制出一种性能优良的双组分水性聚氨酯涂料。讨论了不同水性羟基丙烯酸树脂、消泡剂和n(—NCO)/n(—OH)的大小对涂膜性能的影响;固化剂的选择及用量对双组分水性聚氨酯涂料活化期的影响。结果表明,n(—NCO)/n(—OH)=1.3时涂膜的光泽度为95%,硬度3H,耐水性大于96 h,耐乙醇擦拭性较好。     

双组分水性聚氨酯木器涂料的研制

以自制的水性树脂YX-65配用水分散型聚异氰酸酯固化剂,制备了水性双组分聚氨酯木器涂料.通过对润湿剂、成膜助剂、消泡剂的优化选择,所得涂料的各项性能指标均达到了溶剂型木器涂料的水平,具有广阔的应用前景.     

涂料工业发展热点透视

水性有机硅涂料前景看好。水性有机硅涂料是一种环境友好型涂料，适用性强，具有优异的耐热、耐候、耐腐蚀和防水性能，可广泛应用于航空航天、船舶、铁道桥梁、建筑、家用电器等领域。水性有机硅涂料是以有机硅聚合物为成膜物的水性涂料，根据成膜物的不同，可将水性有机硅涂料分为两种，一种是以硅氧烷为成膜物的有机硅涂料，另一种是以改性有机硅树脂为主要成膜物的涂料。有机硅聚合物具有良好的耐候性、耐臭氧性和电绝缘性，将有机硅聚合物用于水性涂料，不仅具有有机硅材料的优点，而且能消除漆膜的弊病，因此，水性有机硅涂料已成为最具发展前景的涂料品种之一。     

Insect antifeedant properties of anthranoids from the genusVismia

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.     

Direct observation of freeze-thaw instability of latex coatings via high pressure freezing and cryogenic SEM

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.     

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.     

Novel polyurethane coating technology through glycidyl carbamate chemistry

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.     

Highly moisture-proof polysilsesquioxane coating prepared via facile sol-gel process

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.