共查询到20条相似文献,搜索用时 125 毫秒
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采用自乳化聚氨酯水分散体的制备方法,分别制备了含蓖麻油基和巯基的聚氨酯水分散体.将两者按一定比例复合,加入水性光引发剂,在紫外光照射下,通过水性光引发剂引发涂层中的双键及巯基进行巯基-烯点击反应,制得交联聚氨酯涂膜.采用核磁共振氢谱、红外光谱、差示扫描量热仪、热重分析等手段对水分散体及光固化涂膜的结构和性能进行了分析表征.结果表明:巯基和蓖麻油结构中的碳碳双键成功地引入到了水性聚氨酯链段中;在紫外光辐照下,巯基和不饱和双键间进行了加成反应;UV固化膜具有良好的机械性能和热稳定性:凝胶量为96.67%、胶膜吸水率为13.0%、耐冲击性大于50 cm、硬度为5H、耐溶剂(甲乙酮)拭擦次数为734次、失质量50%时的温度为375 ℃. 相似文献
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通过环氧树脂改性以及多元醇内交联、六甲撑二异氰酸酯(HDI三聚体)交联改性、固化剂交联和紫外光交联等四重交联,并加入季戊四醇三丙烯酸酯(PETA)作为接枝化合物,合成了紫外光固化水性聚氨酯丙烯酸酯分散体(WPUD)。研究了环氧树脂改性以及PETA含量对漆膜性能的影响。结果表明,经过环氧改性,采用2.5%的HDI三聚体和13.6%的PETA合成的水性聚氨酯丙烯酸酯分散体,其漆膜吸水率为6.3%,耐丙酮擦洗360次,摆杆硬度0.79。所得漆膜达到或超过了溶剂型紫外光固化涂料的要求。 相似文献
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通过环氧树脂改性以及多元醇内交联、六甲撑二异氰酸酯(HDI三聚体)交联改性、固化剂交联和紫外光交联等四重交联,并加入季戊四醇三丙烯酸酯(PETA)作为接枝化合物,合成了紫外光固化水性聚氨酯丙烯酸酯分散体(WPUD).研究了环氧树脂改性以及PETA含量对漆膜性能的影响.结果表明,经过环氧改性,采用2.5%的HDI三聚体和13.6%的PETA合成的水性聚氨酯丙烯酸酯分散体,其漆膜吸水率为6.3%,耐丙酮擦洗360次,摆杆硬度0.79.所得漆膜达到或超过了溶剂型紫外光固化涂料的要求. 相似文献
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1 概论 聚氨酯涂料是装饰性和保护性等综合性能较好的涂料,但易燃、易挥发、有毒。基于对挥发性有机化合物(VOC)的严格控制及人们对环保、安全和健康意识的提高,使水性聚氨酯得以迅速发展。 1.1 水性聚氨酯分散体(PUD)的分类 水性聚氨酯涂料是以水性聚氨酯树脂为 相似文献
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UV固化水性木器涂料的性能及影响因素 总被引:3,自引:2,他引:1
介绍了UV固化水性木器涂料与传统UV固化涂料、水性木器涂料的比较优势,侧重讨论了影响聚氨酯-丙烯酸酯水分散体UV固化动力学的影响因素,从而导出提高其UV固化速度与反应程度的可行方法,以及优于传统UV固化涂料的性能。 相似文献
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由于传统的溶剂型涂料存在一定的有毒有害物质,为此必须要积极探索溶剂型涂料的替代品通过利用低含量溶剂化、水性化、无溶剂化、粉末化、光固化涂料的研究与发展,不仅能够继承传统的紫外光固化技术和水性技术,而且还能够实现绿色健康环保无污染。紫外光固化技术和水性技术的结合也能够保证材料的防火性能和安全性能在涂料行业得到了快速的发展。本文通过对紫外光固化水性聚氨酯丙烯酸酯的制备,以及性能进行深入的研究,并且异氟尔酮二异氰酸酯为应对聚乙二醇为软段,同时以氢甲基丙酸作为亲水扩链剂加入到烃基之中,利用甲基丙烯酸-β-羟乙酯通过封端引入碳碳双键作为双固化的功能团,实现了多步骤聚反应制备紫外光固化水性聚氨脂、丙烯酸酯。 相似文献
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高固含量水性聚氨酯的合成及其主要影响因素 总被引:3,自引:0,他引:3
以异佛尔酮二异氰酸酯(IPDI)和六亚甲基二异氰酸酯(HDI)为硬段,聚醚二元醇(N-220)及聚酯二元醇(PBA)为软段,二羟甲基丙酸(DMPA)为亲水性物质,乙二胺(EDA)为后扩链剂等,合成了固含量约为50%的环氧树脂(E-20)及甲基丙烯酸甲酯(MMA)复合改性的水性聚氨酯分散体(PUD).并探讨了-NCO/-OH物质的量比、软段类型和软段相对分子质量对高固含量水性聚氨酯性能的影响,同时对制得的PUD进行红外、透射电镜等测试分析,从而制备出性能较好、较稳定的高固含量水性聚氨酯分散体. 相似文献
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Elena Orgilés-Calpena Francisca Arán-Aís Ana M. Torró-Palau César Orgilés-Barceló 《The Journal of Adhesion》2013,89(3):174-191
Waterborne polyurethane adhesives (WBPU) reinforced with carbon nanofibers (CNFs), to make them also conductive to static electricity, were prepared and their properties were evaluated as a function of content (0.1–1 wt%). The incorporation of carbon nanofibers to waterborne polyurethane adhesives implies a great difficulty because of their tendency to form aggregates, which prevents an efficient dispersion. In this sense, it is necessary to insert functional groups on the surface of the nanofibers to improve their interaction with any polymer. In this research, the surfaces of carbon nanofibers were previously oxygenated by chemical functionalization to enhance their stability in waterborne polyurethane adhesives. The obtained results showed that the chemical treatment used to functionalize the carbon nanofillers was adequate, as well as the experimental procedure carried out for their incorporation into the polyurethane, since stable dispersions were obtained. Moreover, the addition of the nanofibers to the waterborne polyurethanes contributed to improving their rheological and viscoelastic properties, imparting an increase in the viscosity and changes in the crystallisation kinetics. 相似文献
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以聚己二酸丁二醇酯二醇(PBA)、二羟甲基丙酸(DMPA)和甲苯二异氰酸酯(TDI)等为主要原料,配合防老剂和紫外光吸收剂,用预聚体法制备不挥发物质量分数为40%的单组分水性聚氨酯树脂;以此树脂为基础,用钛白粉作为着色剂,制备白色水性聚氨酯路标涂料.研究结果表明,预聚体法制备的水性聚氨酯树脂在40℃下放置24 h即可达... 相似文献
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Chenyan Bai Xingyuan Zhang Jiabing Dai Jinhua Wang 《Journal of Coatings Technology and Research》2008,5(2):251-257
A UV crosslinkable waterborne siloxane–polyurethane dispersion, PDMS-PEDA-PU, was synthesized by incorporating acrylate groups
into the side chain of the polyurethane using pentaerythritol diacrylate (PEDA). Polysiloxane groups were introduced into
the soft segment of the polyurethane using polydimethylsiloxane (PDMS). They formed a crosslinking structure after UV radiation.
The structure of PDMS-PEDA-PU was confirmed by the use of Fourier transform infrared spectroscopy (FTIR). X-ray diffraction
(XRD) analysis indicated that the formed PDMS-PEDA-PU was amorphous. The curing rule of PDMS-PEDA-PU was investigated on the
basis of the change in C=C conversion during the UV curing process. The influence of the PDMS/PEDA ratio was studied with
respect to the water resistance, the thermal property, and the mechanical property of the films. 相似文献
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以异氟尔酮二异氰酸酯(IPDI)和聚氧化丙烯二醇(PPG)为原料制备水性聚氨酯,以此为碳源,采用水热法制备碳点,再以IPDI和聚己二酸-1,4-丁二醇酯二醇(PBA)为原料,将不同质量分数的碳点加入反应体系中,制得碳点/水性聚氨酯复合材料。采用FTIR、TEM、SEM、TGA、DSC、UV-Vis、荧光光谱以及力学性能测试等对复合材料结构和性能进行检测和表征。结果显示,复合胶膜的热稳定性、荧光性能、力学强度都因碳点的加入得到提高,当碳点加入质量分数达0.5%时,复合胶膜的量子产率和荧光寿命分别为4.15%和2.43 ns,胶膜的拉伸强度和断裂伸长率分别为36.80 MPa和660%,比未加碳点的样品分别提高了29.7%和33.3%。 相似文献