超支化聚氨酯丙烯酸酯的性能与UV固化动力学研究

采用2-羟基-2-甲基-1-苯基-1-丙酮（Darocur 1173）作为超支化聚氨酯丙烯酸酯（HBUA）的紫外光（UV）固化引发剂,研究了Darocur 1173用量、活性单体种类及用量对HBUA固化膜机械性能的影响,并用光差扫描量热法（Photo—DSC）对HBUA的光固化动力学进行了表征。结果表明,随着Darocur 1173用量的增加,光固化膜的摆杆硬度及冲击强度增大,最大光固化反应速率Rp^max提高,到达Rp^max的时间缩短。己二醇二丙烯酸酯（HDDA）作活性单体更有利于提高光固化膜的机械性能,并有利于促进光固化反应的进行。Darocur 1173和HDDA的适宜用量分别为4％（wt）和20％（wt）。     

UV固化超支化聚酯丙烯酸酯的合成及其固化性能

以季戊四醇、2,2-二羟甲基丙酸、丁二酸酐和甲基丙烯酸羟乙酯为原料,合成一种新型UV固化超支化聚酯丙烯酸酯(HPA)。通过红外光谱、核磁共振谱表征了其结构;测试了相对分子质量及其分布和黏度;并考察了其紫外光固化性能。结果表明:在反应时间6 h、反应温度90 ℃、n[HP-(COOH)₈]∶n(HEMA)=1∶8时合成的HPA,当用4.5%的光引发剂1173引发固化时,UV辐照能量最小,为600 J/m ²,且固化速度比市售低聚物RJ544组成的相似体系快5倍,其双键的转化率可达89.8%。在制备的HPA经UV固化后,涂膜的铅笔硬度为2H,附着力为1级,柔韧性为0.5 mm。     

紫外光固化聚氨酯改性环氧丙烯酸酯的制备

通过分子设计制备了紫外光固化聚氨酯改性环氧丙烯酸酯,利用红外光谱(FT-IR)、扫描电子显微镜(SEM)、差示扫描量热(DSC)对产物结构进行了表征,并对光固化涂膜的性能进行了测试。结果表明:制备的聚氨酯改性环氧丙烯酸酯具有良好的相容性,以其制备的光固化涂膜具有优良的性能,硬度为3H、附着力为1级、耐冲击性为50 cm、柔韧性为1 mm。     

腰果壳油环氧丙烯酸酯改性EA光固化涂料

采用分子内含有长烷烃链的环氧化腰果壳油丙烯酸酯与双酚A型环氧丙烯酸酯（EA）拼混改性,降低了施工黏度、改善了涂膜脆性.研究了光引发剂种类、用量以及环氧化腰果壳油丙烯酸酯（CNOEA）的用量等因素对光固化涂料性能的影响.同时考察了涂膜的固化体积收缩率和涂料的贮存稳定性.结果表明,光引发剂1173用量为2.5%,CNOEA为35.0%,光固化涂料的性能较优;此时,涂膜的体积收缩率为6%～7%,45℃下20d及室温条件下2个月的贮存稳定性较好.     

联苯单元丙烯酸酯的合成及光固化研究

本文研究了含有液晶基元联苯的新型光活性单体的合成及结构表征。新型光活性单体与甲基丙烯酸β羟乙酯(HEMA)、光引发剂复配成光固化胶,研究了紫外光固化膜的硬度、冲击性能、柔韧性、耐溶剂性、耐水性及耐热性等性能与结构的关系。     

热塑性丙烯酸酯树脂在紫外光固化涂料中的应用

在紫外光固化体系中引入非紫外光固化的热塑性丙烯酸酯树脂作为辅助成膜物.讨论了其对体系成膜附着力、柔韧性、硬度、光泽的影响.实验结果表明：选择合适相对分子质量的热塑性丙烯酸酯树脂可以改善紫外光固化涂料的附着力和柔韧性等漆膜性能.     

环氧豆油丙烯酸酯光固化速率的影响因素

将环氧大豆油与丙烯酸反应制备出环氧豆油丙烯酸酯预聚物,考察了光引发剂的种类、用量、辐射距离、时间及合成树脂的结构对光固化速率的影响,并利用红外光谱对树脂固化前后的结构进行了表征。研究结果表明,当辐射距离为20 cm时,光引发剂IHT-PI 184的用量为3%时固化速率最快,且随着酯化率的升高,固化速率加快,光固化后凝胶含量达到94.7%。     

水性超支化聚氨酯丙烯酸酯的结构及光固化动力学研究

以水性超支化聚氨酯丙烯酸酯为研究对象,通过傅里叶变换红外光谱研究了其合成过程中主要活性基团变化,并结合核磁共振氢谱及核磁共振碳谱分析合成树脂的结构,结果表明:实验合成得到了目标产物水性超支化聚氨酯丙烯酸酯.对涂膜紫外光固化动力学的研究表明,分子结构中羧基及不饱和双键含量对固化速度及最终双键转化率有重要影响,双键最终转化...     

UV固化粉末涂料用不饱和丙烯酸酯共聚物的合成

以AIBN作引发剂、巯基乙酸作链转移剂、甲基丙烯酸缩水甘油酯作封端剂、苄基氯化三乙胺作催化剂，合成了紫外光固化粉末涂料用的不饱和丙烯酸酯共聚物（即光敏聚合物）。探讨了投料单体组成对光敏聚合物玻璃化温度的影响，考察了封端反应条件对光敏聚合物分子有效率的影响。对合成的预聚物及光敏聚合物进行了UV、FT-IR、DSC测试表征。研究表明：要制得有效率高的光敏聚合物分子，适宜的反应条件为：甲基丙烯酸缩水甘油酯与预聚物物质的量之比1．5-2．0，反应温度为138℃，反应时间为9-12h，催化剂的用量选择在1．0％～1．5％（以GMA与预聚物总物质的量计）。     

SiO_2消光剂(UV55C)对环氧豆油丙烯酸酯性能的影响

考察了 Si O2 消光剂 (UV5 5 C)对环氧豆油丙烯酸酯及其涂膜性能的影响。试验结果表明 :Si O2 消光剂 (UV5 5 C)的加入 ,降低了环氧豆油丙烯酸酯的固化速率和其涂膜的光泽度 ,但提高了其涂膜的硬度、耐磨性和附着力     

光敏性含磷聚氨酯丙烯酸酯(P-PUA)阻燃预聚物的合成与性能

合成了4种不同结构的光敏性含磷聚氨酯丙烯酸酯阻燃预聚物,并对其结构进行了表征。研究了以所制预聚物为基料的光固化涂料的柔韧性、附着力、硬度等基本物理性能和耐热防火性能。结果表明,该涂料能达到市售PUA涂料的基本物理性能,并具有较高的分解温度,800℃下形成的炭渣能达到涂层原重的20%左右,具有一定的耐热防火性能;以结构相似的阻燃预聚物为基料的涂层,其耐热防火性能随含磷量的增加而提高;预聚物主链中芳环含量也影响涂层的耐热防火性能,相对分子质量相近的预聚物,其主链上的芳环数量增加一倍,涂层在800℃下w(炭渣)能增加5个百分点。     

生物基巯基-烯UV固化涂膜的制备及性能研究

以没食子酸、环氧大豆油和蓖麻油为原料,通过简单绿色的工艺制备了一系列可UV固化活性单体(GAM、SOM、COT), 并将所制备的单体进行巯基-烯UV固化,制得一系列可再生碳含量较高的UV固化涂膜。通过核磁( ¹H NMR)、热重分析仪(TGA)、差示扫描量热仪(DSC)、动态机械分析仪(DMA)对单体结构和膜的性能进行了表征分析,并研究了不同单体含量对涂膜机械性能、玻璃化转变温度(T_g)以及热性能的影响。结果表明:随着没食子酸基单体含量增加,UV固化涂膜的铅笔硬度和T_g有所提升,涂膜整体具有较好的热稳定性。     

热/UV双重固化制备耐划伤光学扩散膜

采用热/UV双重固化方式制备高透光率、高雾度光学扩散膜扩散涂层.分别研究了不同树脂/粒子比例(以热固化树脂为参考)、双重固化树脂比例(UV固化树脂/热固化树脂),以及相同树脂/粒子比例条件下不同粒子粒径等参数对光学扩散膜扩散涂层力学性能、光学性能的影响.对制备的光学扩散膜扩散涂层力学、光学性能及表观形貌进行表征.测试结果表明:使用合适比例的热/UV混合固化树脂,能够制备出具有耐划伤性能且翘曲度较低的光学扩散膜扩散涂层.     

UV固化聚氨酯丙烯酸酯的非催化合成及性能

在不使用任何催化剂的条件下,合成了UV固化的聚氨酯丙烯酸酯树脂。采用傅里叶变换红外光谱、核磁共振氢谱、碳谱对合成树脂进行了表征,并采用综合热分析仪对固化膜的耐热性进行分析。试验结果表明:随着活性单体官能度的增大,固化膜的耐热性提高;随着双官能团单体三缩丙二醇二丙烯酸酯(TPGDA)用量的增加,固化膜的耐热性略有提高,但变化不明显;其他性能测试表明:固化膜具有优异的综合性能。     

Dual‐Curing of Waterborne Urethane‐Acrylate Coatings by UV and Thermal Processing

A waterbased dual‐cure urethane‐acrylate oligomer has been synthesized by polycondensation of monomers bearing hydroxyl, isocyanate and acrylate groups. To obtain a stable aqueous dispersion, carboxylate groups were grafted on the oligomer chain and the isocyanate groups were protected by a blocking agent. After water release by a brief heating, the dry films were cured either by a short UV exposure in the presence of a photoinitiator to induce the polymerization of the acrylate double bonds, or by heating up to 150 °C to release the isocyanates and promote the polycondensation by reaction with the hydroxyl groups, but mainly by a combination of UV and thermal cure. Both processes have been followed quantitatively by infrared spectroscopy to evaluate the influence of the temperature on the reaction rate and on the cure extent. The newly developed waterbased dual‐cure coatings were found to be quite resistant to accelerated weathering because of their aliphatic structure and their high crosslink density. Their light stability was substantially improved by the addition of a hydroxyphenyltriazine UV absorber and a hindered amine radical scavenger.

Thermal curing of the dual‐cure waterborne PUA formulation at a temperature of 150 °C.     

Mechanical and thermal properties of UV cured mixtures of linear and hyperbranched urethane acrylates

The properties of urethane acrylate resin mixtures based on the linear and hyperbranched aliphatic polyesters were examined. Linear polyester was synthesized from neopentil glycol and adipic acid. Hyperbranched polyester of the third generation was synthesized from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylol propane. The modification of 60% of hyperbranched aliphatic polyester OH end groups was carried out with isononanoic acid or with soybean fatty acids. Two hyperbranched urethane acrylates, with the same degree of acrylation, and one linear urethane acrylate were obtained by reaction of appropriate polyester and isophorone diisocyanate and 2-hydroxyethyl acrylate. The influence of added amount of HUA and nature of non-acrylic end groups on the rheological, mechanical and thermal properties of the uncured and UV cured mixtures diluted with 20 wt.% hexanediol diacrylate was examined. The nature of non-acrylic end groups have great effect on the interaction between linear and hyperbranched urethane acrylates, which further has a crucial influence on the examined properties of uncured and UV cured mixture samples.     

2-苯氧基乙基丙烯酸酯(PHEA)的合成及应用研究

采用苯酚、环氧乙烷在催化剂的作用下进行了开环聚合反应得中间体,再对中间体采用特殊精馏方式进行组份分离,得到了2-苯氧基乙醇,然后经丙烯酸酯化得2-苯氧基乙基丙烯酸酯。介绍了一种低收缩率单体及其合成方法,并且对其在UV涂料中的应用性能进行了研究。     

环氧丙烯酸树脂/BDM的紫外光固化研究

文章探讨了EA/BDM体系实现UV固化的条件,研究了引发剂种类及其含量对EA/BDM体系光固化的反应性及热稳定性的影响。结果表明,2,4,6-三甲基苯甲酰基-二苯基氧化磷（TPO）的综合引发效果要好于同类引发剂1-羟基-环己基-苯基甲酮和夺氢型光引发剂异丙基硫杂蒽酮。固化后所得膜热稳定性比纯EA有一定幅度的提高。     

响应面法优化漆酚环氧丙烯酸酯涂层性能研究

设计合成了一种新型漆酚环氧丙烯酸酯光敏树脂,对产物的结构进行了表征.利用所合成的树脂制备光固化涂料,采用响应面分析法研究了各因素对光固化漆膜力学性能的影响,得出了漆膜硬度、附着力和耐冲击性的二次回归模型,并对漆膜的制备工艺进行了优化.结果表明:构建的响应面模型拟合精度较高.各主要因素对硬度影响顺序为:固化时间＞引发剂质...     

Effects of compaction and UV exposure on performance of acrylate/glass‐fiber composites cured layer by layer

With an aim to reducing manufacturing costs, in general and specifically to provide a solution to the thick laminate curing depth issue for composite materials, UV curing technology was combined with a fiber placement process to fabricate acrylate/glass‐fiber composites. A novel layer‐by‐layer UV in situ curing method was employed in this article and interlaminar shear strength (ILSS) tests and SEM were used to evaluate the effect of processing parameters, including compaction force and UV exposure dose, on ILSS. The SEM images from short‐beam strength test samples and the results of ILSS showed that the fibers' distribution was uniform in the cured matrix resin resulting from the compaction forces and that beneficially influenced the ILSS of the composite greatly. However, the matrix resin produced large shrinkage stresses when it reached a high degree of conversion (DC) in one‐step, which resulted in poor interlaminar adhesion. In addition, the fast curing speed of UV on the composite resulted in poor wetting between fiber and resin, and accordingly resulted in lower ILSS. To overcome these problems and obtain high ILSS value composites, an optimized compaction force and UV exposure dose were determined experimentally. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012