水性环氧改性聚氨酯涂料的研制

通过环氧树脂与聚氨酯的接枝反应,合成了环氧改性聚氨酯乳液,用其配制综合性能良好的水性环氧改性聚氨酯涂料,适用于木地板涂装,使用效果好。讨论了ＮＣＯ／ＯＨ比值、环氧树脂加量和残留异氰酸根的量对涂料性能的影响。     

特殊聚氨酯改性环氧树脂的研究进展

利用聚氨酯改性环氧树脂是提高环氧树脂综合性能的有效途径,目前聚氨酯改性环氧树脂已经成为学者研究的重点和热点。本文着重综述了特殊的聚氨酯改性环氧树脂的研究。分别介绍了液晶聚氨酯、含氟聚氨酯、高度支化聚氨酯、非异氰酸酯聚氨酯、含硅氧烷聚氨酯、高弹性聚氨酯和刚性聚氨酯改性环氧树脂取得的研究结果。     

特种聚氨酯改性环氧树脂的研究

研究了在环氧树脂体系中,引入特种聚氨酯预聚体作为改性剂制备聚氨酯改性环氧树脂。通过红外图谱来表征改性的环氧树脂表明,改性是由环氧树脂上的羟基和聚氨酯预聚体上的异氰酸根两者交联来实现的,聚氨酯改性的环氧树脂其主体是环氧树脂,改性后环氧基团未发生变化。由性能测试可知,与改性前环氧树脂相比,经改性后环氧树脂基本性能未发生变化,但具有良好疏水性能。     

环氧树脂改性水性聚氨酯的研究

通过自乳化法合成了水性聚氨酯,用环氧树脂E-44改性水性聚氨酯。探讨了水性聚氨酯的配方及反应条件,研究了环氧树脂用量、加入方式、温度等因素对乳液稳定性和涂膜性能的影响。结果表明：用环氧树脂改性水性聚氨酯,可显著提高水性聚氨酯的耐水性、耐溶剂性等性能。     

封闭型聚氨酯-环氧树脂复合乳液的合成及其防腐性能研究

采用二乙醇胺对双酚A型环氧树脂进行开环,再以甲乙酮肟为封闭剂,对聚氨酯预聚体的端—NCO基进行部分封闭,再结合开环后的环氧树脂,合成了一种稳定性良好、防腐性能优异的封闭型聚氨酯-环氧树脂复合乳液。研究了环氧树脂开环剂、聚氨酯预聚体的封闭程度以及环氧树脂用量对乳液和涂膜性能的影响,通过电化学方法和浸泡腐蚀实验研究了涂膜的防腐性能。结果表明:开环后的环氧树脂能显著提高乳液的稳定性,而耐腐蚀性变化不大;聚氨酯预聚体封闭程度为40%~43%时聚合物的交联度合适,乳液性能优异;随着环氧树脂用量增加,乳液粒径先减小后增大,涂膜防腐性能逐渐提高,且远优于非封闭型聚氨酯-环氧树脂成膜体系;环氧树脂用量可达24%左右。     

水性环氧改性聚氨酯乳液的制备与讨论

在制备水性聚氨酯基础上引入了环氧树脂,制得了水性环氧改性聚氨酯乳液。环氧树脂的引入增加了水性聚氨酯的交联结构,与改性前的水性聚氨酯相比,其涂膜耐水性、耐溶剂性以及机械性能都得到了提高。并研究了环氧树脂的引入方法及环氧树脂加入量对分散体及其涂膜性能的影响。傅里叶红外光谱分析显示出了环氧树脂与水性聚氨酯之间存在化学键的连接...     

环氧树脂/有机硅复合改性聚氨酯阻燃涂料的研究

采用正交试验法,以涂膜的力学性能和耐燃时间为依据,确定了制备环氧树脂/有机硅复合改性聚氨酯阻燃涂料时,环氧树脂与有机硅的配比,阻燃剂聚磷酸铵、三聚氰胺、季戊四醇的最佳用量。对涂膜进行了红外光谱和热重分析,对比检测了未改性聚氨酯涂料和环氧树脂/有机硅复合改性聚氨酯阻燃涂料的各方面性能。结果表明,环氧树脂/有机硅复合改性聚氨酯阻燃涂料的涂膜具有较高的拉伸强度,热稳定性能良好,防火阻燃性能优良。     

环氧树脂-聚氨酯阻燃改性研究

以端异氰酸酯基聚氨酯为预聚体,环氧树脂CYD-011为原料,以氢氧化镁为阻燃剂对环氧树脂-聚氨酯进行了阻燃抑烟改性研究。测试结果表明,随着氢氧化镁的逐渐加入,环氧树脂-聚氨酯的热分解温度上升,氧指数提高。同时,燃烧过程中,氢氧化镁促使环氧树脂-聚氨酯表面形成致密薄膜,延缓热量和氧气的传递,提升了环氧树脂-聚氨酯的阻燃抑烟性能。     

一种聚氨酯改性环氧树脂胶黏剂的制备与性能表征

以甲苯二异氰酸和聚丙二醇等为原料对普通的环氧树脂进行改性研究,考察了PU含量对环氧树脂耐热性、韧性等的影响。通过红外光谱、SEM、热重分析和流变性等方式对合成的聚氨酯改性环氧树脂进行了性能的表征和检测。红外光谱测试结果表明聚氨酯的-NCO和氨基甲酸酯中-NH均与环氧基发生了反应,可断定聚氨酯成功与环氧树脂嫁接;热重分析结果表明聚氨酯改性环氧树脂耐热性强于环氧树脂;粘度测试结果表明改性后环氧树脂流动性变好;SEM结果表明改性后环氧树脂的断面银纹增多、韧性增强。     

聚氨酯-丙烯酸酯复合乳液成功合成

聚氨酯-丙烯酸酯复合乳液虽然较单一乳液的性能有很大改善,但是其涂膜的硬度、耐水性、耐化学品性还难以满足高档水性木器涂料的要求。最近,湖南大学化学化工学院在聚氨酯-丙烯酸酯复合乳液中,以不同方式加入环氧树脂,分别制备了物理共混和化学共聚的聚氨酯-丙烯酸酯-环氧树脂复合乳液（PUEA）,着重研究了环氧树脂加入方式、用量等对乳液及涂膜性能的影响。发现环氧树脂对于涂膜的硬度、耐水性、耐化学品性等有明显改进．研究还表明,环氧树脂的质量分数在3％～4％为宜。近年许多研究者利用PU乳液和PA乳液性能上具有的良好互补作用,共聚制备聚氨酯-丙烯酸酯（PUA）复合乳液;在先前的PUA复合乳液研究基础上,加入环氧树脂,合成环氧树脂改性的聚氨酯-丙烯酸酯（PUEA）复合乳液,可使其涂膜的吸水率显著降低,硬度与其他有关性能也有一定提高。     

Durability of Aluminium Adhesive Joints Bonded with a Homopolymerised Epoxy Resin

The durability of epoxy-aluminium joints that use a homopolymerised epoxy resin was studied, and the effects of relative humidity, temperature, and salt concentration were analysed. The adhesive properties were measured by lap-shear tests, and the water uptake of the epoxy resin was determined by gravimetric measurements. Ageing and degradation effects on the epoxy resin and on the aluminium substrates were also analysed.

The homopolymerised epoxy resin absorbs little water (1.5 wt%) because of its nonpolar network structure. The water uptake is enhanced by increasing relative humidity and temperature; however, the joint strength remains constant because of epoxy plasticization. A saline environment is damaging to the adhesive joints, because of metal corrosion, but was not significantly harmful to the epoxy resin, because of a lower diffusion coefficient of salt water. The T_g decrease of the epoxy adhesive due to water absorption depends only on the amount of absorbed water and is independent of the hydrothermal ageing conditions.     

环氧树脂纳米蒙脱土胶粘剂耐蚀性能研究

研究了水泥、蒙脱土(有机化和未有机化)和粉煤灰作为填料在环氧树脂胶粘剂涂层中的作用,讨论了不同填料对胶粘剂的耐蚀性能的影响。试验采用的腐蚀介质有自来水、氢氧化钠水溶液、氯化钠水溶液和盐酸溶液。试验结果表明加入有机化蒙脱土的环氧树脂胶粘剂,在无介质,强酸和强碱环境中,都具有较好的拉伸剪切强度。推荐了在不同介质条件下的胶粘剂的使用配方。     

In situ synthesis of novel biomass lignin/silica based epoxy resin adhesive from renewable resources at different pHs

Novel biomass lignin/silica composites were prepared and isolated from rice husk renewable resources at different pHs. Selective precipitation was achieved by decreasing the solution pH from 9.5 to 1.5. When pH reached 3.5, the ratio of lignin and silica mostly achieved the maximum of 1:1. We selected lignin/silica composites as reactants to replace 20?wt% bisphenol A in preparing epoxy resin. The cured novel biomass function lignin/silica-based epoxy resin adhesive showed the highest adhesive strength up to 2.68?MPa, which displayed 123% of neat epoxy resin adhesive. In addition, lignin/silica composites were depolymerized through the hydrothermal method by NaOH as a catalyst, which was used as reactants to replace 35?wt% bisphenol A in the process of in situ synthesis of epoxy resin adhesive. At this point, the high epoxy value (1.42?wt%) and large adhesive strength (3.98?MPa) of lignin/silica-based epoxy resin adhesive were obtained, which adhesive strength was 183% of neat epoxy resin adhesive. The results demonstrated that depolymerized lignin/silica-based epoxy resin adhesive showed the higher epoxy value and the adhesive strength compared with neat epoxy resin adhesive and lignin/silica-based epoxy resin adhesive. Their function in epoxy matrix resulted in better processability.     

聚氨酯改性环氧树脂胶黏剂的研究与应用进展

简要介绍了环氧树脂胶黏剂的特性,指出聚氨酯改性环氧树脂的主要目的是提高其韧性。分别论述了几种常用的聚氨酯增韧改性环氧树脂胶黏剂的方法,包括端胺基／端羟基／端异氰酸酯基／端环氧基聚氨酯预聚体增韧改性环氧树脂,聚氨酯环氧树脂接枝共聚改性环氧树脂以及聚氨酯互穿聚合物网络增韧环氧树脂,其中详细介绍了聚氨酯互穿聚合物网络增韧环氧树脂技术。同时,对国内聚氨酯改性环氧树脂胶黏剂的主要应用进行了介绍,并指出了我国目前聚氨酯改性环氧树脂胶黏剂的不足和发展方向。     

环氧改性丙烯酸酯结构胶的研究

以环氧丙烯酸酯树脂、端羧基丁腈橡胶改性环氧预聚物、多官能度环氧作为改性环氧树脂,对传统的第二代丙烯酸酯结构胶黏剂进行改性研究,测试表征了耐高温性、耐水性、伸长率、贮存性能等。结果表明,同时采用多种改性环氧树脂对丙烯酸酯结构胶进行改性,其综合性能明显提高:180℃剪切强度由0.3MPa提高到2.7MPa、28d浸水试验剥离强度保持率由2%提高到75%、断裂伸长率由3.5%提高到19.3%。     

环氧树脂改性水性聚氨酯胶粘剂的合成与性能

在用环氧树脂E-51和内交联剂TMP共同改性的水性聚氨酯胶粘剂中,适当添加环氧树脂可得到稳定的乳液,且综合性能较好。文中讨论了以共聚方式加入环氧树脂,结合DSC和力学性能等方面的研究,找出了合适的环氧树脂添加量为4．0%-8．0%。用环氧树脂改性的水性聚氨酯涂膜具有硬度高,耐水性好等特点。     

The Effect of Aging in Water on the Strength of Fiber-Polymer Systems

The effect of the exposure time in water on the adhesive strength of fiber/resin systems was studied. To this end, the adhesive strength of single-fiber/matrix systems was measured. Such a system simulates the unit cell of a fiber-reinforced composite. The resin was an epoxy (DGEBA-based) polymer. The substrate used consisted of boron fibers, a steel wire and glass fibers. The samples were kept in water for a period of 1-280 days at room temperature and the adhesive strength was measured also at room temperature. The water absorption of the resin and the impregnated strand produced on the basis of the glass fibers and the resin studied and also the physico-mechanical characteristics of the impregnated strand were studied at the same time. The samples used to determine the adhesive strength were kept in such a contact with water that the latter could penetrate into some of them only at the interface and into the others at the interface and through the resin layer.

It was found that the adhesive strength decreases with increasing amount of water absorbed. On the basis of the results obtained it was concluded that the principal factor that determines the loss in adhesive strength during the aging of the systems in water is the plasticization of the epoxy resin by water.     

盾构管片专用胶的研制及应用

以端羧基液体丁腈橡胶、环氧树脂、增稠剂、着色剂等为主要材料,研制了一种盾构管片专用的改性环氧树脂胶粘剂。通过将三元乙丙橡胶密封条和丁腈软木衬垫粘接在盾构管片上,有效地解决了盾构管片的渗水和安装问题。实验结果表明,制备的胶粘剂拉伸强度和剥离强度均满足设计要求,具有强度高、耐水性和耐老化性强等优点。     

Preparation and cured properties of diallyl phthalate resin modified with epoxy resin and allyl ester compound having carboxylic acid

An epoxy resin was blended with a diallyl phthalate resin to improve the adhesive properties and the fracture toughness. A compatibilizer was used to reduce the decrease in heat resistance. An allyl ester compound [1,4‐diallyloxycarbonyl‐2,5‐benzenedicarboxylic acid (DAPY)], which reacted with the diallyl phthalate resin and epoxy resin to have allyl groups and carboxylic acids on the end of the molecular chain, was synthesized as a compatibilizer by the reaction of pyromellitic dianhydride with allyl alcohol. These blends were cured with dicumyl peroxide and triethylamine. By modification with the epoxy resin and DAPY, the lap shear adhesive strength to steel increased up to about 3 times that of the diallyl phthalate resin. These results suggest that the secondary hydroxyl group generated by the addition reaction of the epoxy resin and DAPY and the secondary hydroxyl group existing in the molecular chain of the epoxy resin formed hydrogen bonds with the hydroxyl group of water existing on a metal surface, and as a result, the adhesive strength to metal such as steel increased. The fracture toughness of the diallyl phthalate resin was increased by modification with the epoxy resin. The reason for this result was that the flexibility increased because the crosslinking density became small by modification with the epoxy resin. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2010     

环氧树脂对层压复合用水性聚氨酯性能的影响

采用异佛尔酮二异氰酸酯(IPDI)、聚己二酸丁二醇酯(PBA)、二羟甲基丙酸(DMPA)、环氧树脂等原料制备了层压复合用水性聚氨酯(WPU)胶粘剂,考查了环氧树脂用量对其性能的影响。结果表明,随着环氧树脂用量的增加,WPU乳液黏度增加,粒径逐渐变大,稳定性变差;经环氧树脂改性的WPU,胶膜的耐水性优于未改性胶膜,力学性能得到提高。