共查询到19条相似文献,搜索用时 203 毫秒
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UV固化超支化聚氨酯丙烯酸树脂的研究进展 总被引:1,自引:0,他引:1
超支化聚氨酯是一种新型的功能性树脂,UV固化超支化聚氨酯丙烯酸树脂作为一种新型的涂料成膜物质,具有固化速度快、涂膜性能好、环境污染小等优点,对制备环境友好、性能优异的产品以及用其改性普通的UV光固化树脂具有实际意义,展现出良好的发展前景。本文就国内外有关UV固化超支化聚氨酯丙烯酸树脂的制备方法、固化动力学和固化流变行为等方面的研究工作进行了综述,并介绍了UV固化超支化聚氨酯丙烯酸树脂在改善涂膜力学性能和阻尼性能等方面的应用研究现状,提出完善UV固化超支化聚氨酯丙烯酸树脂的基础研究和在此基础上的相关产品的开发将是今后研究的主要发展方向。 相似文献
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超支化树脂改性UV固化粉末涂料 总被引:12,自引:1,他引:12
本将超支化树脂(HBP)与UV固化粉末涂料的相结合,研究了超支化树脂对该涂料的树脂体系玻璃化温度、流变性能及涂膜各项物理性能的影响。结果表明:添加改性与未改性超支化树脂都能降低树脂体系的玻璃化温度,改性超支化树脂不影响体系的流变性能及涂膜性能,未改性超支化树脂可以降低体系粘度但使涂膜性能变差。 相似文献
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以二乙醇胺、丙烯酸甲酯、季戊四醇为原料,通过一步法制备第2代端羟基超支化聚(酯-胺)树脂(HO-16),然后以全氟辛酸和氯化亚砜为原料制备全氟辛酸酰氯中间体,用全氟辛酸酰氯对此超支化树脂上的端羟基进行部分改性,制得端基含氟的超支化树脂(HO-16-F),并通过红外和热重等方法对其进行表征。研究了不同接枝率的改性含氟超支化树脂固含量与黏度的关系,测定HO-16和改性树脂HO-16-F在不同溶剂中的溶解性。最后以HDI三聚体为固化剂,研究不同全氟辛酸酰氯接枝率的含氟超支化树脂的涂膜性能。 相似文献
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超支化聚(胺-酯)是一种具有高度支化结构的新型超支化聚酯。将超支化聚(胺-酯)作为为改性剂添加到透明聚氯乙烯(PVC)树脂中,研究了其对透明PVC树脂热稳定性和力学性能的影响。结果表明,新型超支化聚(胺-酯)的添加可改善透明聚氯乙烯树脂的热稳定性,使5%失重温度提高3~6℃;同时,不同代数超支化聚(胺-酯)的添加均会对透明聚氯乙烯树脂的力学性能有显著影响,其中,第3代超支化聚(胺-酯)的含量为3%时,透明聚氯乙烯树脂具有最佳的拉伸强度、断裂伸长率,而当超支化聚(胺-酯)的含量为5%时,透明聚氯乙烯树脂冲击韧性达到最佳。 相似文献
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增强增韧环氧杂化树脂制备与性能研究 总被引:2,自引:0,他引:2
双酚A型环氧树脂的增韧增强研究是热固性树脂的重要发展方向之一,利用一步法合成了脂肪族端羟基超支化聚合物(HTP-2),再利用"嫁接法"制备了液体型超支化环氧树脂HTPE-2,研究了HTPE-2/双酚A型环氧杂化树脂的力学性能和热学性能.利用红外光谱、扫描电镜、热分析和分子模拟技术讨论了超支化环氧树脂的结构、杂化树脂的性能和原位增韧增强机理.结果显示,杂化树脂的力学性能随超支化环氧树脂含量的增加先提高后下降,具有最大值;当HTPE-2的质量分数为9%~12%时,杂化树脂的拉伸强度、弯曲强度、冲击强度和断裂韧性分别提高18.0%、35.7%、192.4%和39.6%,综合性能较好,但玻璃化转变温度(T8)和热分解温度有所下降. 相似文献
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采用硬脂酸对商业化的超支化聚酯(Blotorn H20)进行端基改性,提高其玻璃化转变温度(T_g),将其作为增大粉末涂膜表面张力和降低熔体黏度的助剂,以期达到减少涂膜表面缩孔和针孔,改善粉末涂料涂膜的表观性能的目的。运用红外光谱仪(FT-IR)、差式扫描量热分析系统(DSC)、旋转流变仪、接触角测量仪等方法进行了表征,研究表明硬脂酸封端Blotorn H20超支化聚酯(SA-HBP)的T_g升高到70℃,满足粉末涂料的贮存要求;与未加入SA-HBP的粉末涂料相比,加入SA-HBP后熔体黏度降低了20%~50%,表面接触角从100°降到80°,橘皮、针孔和缩孔等表面缺陷减少,同时物理机械性能如硬度、耐冲击性、附着力均有所改善。 相似文献
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采用超支化聚酯Boltorn H 20与丁二酸酐反应,制备了亲水性超支化聚酯,然后与甲基丙烯酸酯基改性的聚醚基聚氨酯预聚体和3-异氰酸酯基丙基三乙氧基硅烷(IPTS)反应,合成了有机硅烷偶联剂改性紫外光固化聚醚基超支化水性聚氨酯(WHPU)。考察了有机硅烷偶联剂用量对WHPU的耐酸性、固化时间、凝胶质量分数、附着力、水接触角、水吸附率、乳液粒径分布及热稳定性的影响。结果表明,当IPTS与Boltorn H 20中羟基的摩尔比为6/16时,固化后的WHPU膜的凝胶质量分数为92%,在玻璃表面的附着力达到0级;与不含有机硅烷偶联剂的WHPU相比,该涂膜的水接触角和热稳定性分别提高了34°和22℃,其吸水率从13.8%降低到4.3%。 相似文献
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通过化学共聚改性的方法在粉末涂料聚酯树脂中引入有机硅,合成了粉末涂料用有机硅改性聚酯树脂,研究了有机硅中间体用量对改性聚酯树脂黏度、相对分子质量及其分布、玻璃化转变温度和热失质量的影响。并用其制备了平面和消光 2种粉末涂料,研究了不同有机硅中间体加量对涂层性能的影响。结果表明:有机硅中间体加量为 42%的改性聚酯树脂具有合适的玻璃化转变温度和黏度,制备的粉末涂层具有良好的附着力;在 350℃左右的高温下平面涂层具有优秀的保光率,加入云母粉的消光涂层则具有更好的弯曲性能。有机硅改性聚酯树脂在兼顾耐热性和平面高光的同时,又解决了使用纯有机硅树脂的价格偏高的问题,为市场提供了耐高温粉末涂料用聚酯树脂的更多选择性。 相似文献
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通过对比4种含有不同侧基结构的聚氨酯胶膜的力学性能和耐水解性,发现以含有较大空间位阻侧基的2-乙基-1,3-己二醇与己二酸合成聚酯二元醇(PEPO。EHO)为原料制备的聚氨酯胶膜具有较优异的耐水解性,而以1,3-丙二醇与己二酸合成聚酯二元醇(PEPO—PPD)为原料制备的聚氨酯胶膜具有较好的力学性能。选取PEPO-EHO与PEPO-PPD混合后制备出的聚氨酯胶膜力学性能和耐水解性较好。当PEPO-EHO与PEPO-PPD在软段中混合的质量分数分别为50%时,所制备的聚氨酯胶膜具有较好的综合性能。 相似文献
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A series of polyester polyol resin was synthesized by using 1,4-cyclohexanedimethanol (1,4-CHDM) and three different diacids:
1,3-cyclohexanedicarboxylic acid (1,3-CHDA), isophthalic acid (IPA) and adipic acid (AA). The solubility and viscosity of
the polyester polyols were determined by using methyl ethyl ketone (MEK). All the polyester polyols were crosslinked with
hexamethylene diisocyanate (HDI) isocyanurate to form polyurethane coating films. These films were evaluated for their mechanical
and chemical resistance properties. Studies on the film characteristics revealed that the polyurethane films based on cycloaliphatic
diacid generally showed comparatively better performance properties than the polyurethane film based on aromatic and linear
aliphatic diacids in general. 相似文献
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Modification of existing polymers by physico-chemical technique is not only interesting and useful to the academic community
but the resulted product is attractive to industrial application too. In this investigation, hyperbranched epoxy was modified
by vegetable oil-based highly branched polyester resin at different weight percentages and properties of the cured systems
were evaluated in order to justify them as advanced thin film materials with high adhesive strength. Modified systems were
studied using FTIR, XRD, TGA and SEM analyses. Curing reaction was confirmed by FTIR study and swelling test. Performance
characteristics like tensile strength, impact strength, adhesive strength, flexibility, scratch hardness, gloss and chemical
resistance of cured films have also been studied. Modified systems showed improved properties over pristine epoxy. Comparison
study of modified systems showed that hyperbranched epoxy with 30 wt% polyester content is the best composition w.r.t performance
and might be utilized in advanced thin film application. 相似文献
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Cycloaliphatic epoxide‐based cationic UV curable coatings containing three different hyperbranched polyols (HBPs) were systematically formulated and characterized. Polyether polyols were found to deter epoxide conversion under low UV intensity. For high UV intensity, the cycloaliphatic epoxide conversion increased with polyol content. Coatings with HBPs had better flexibility and solvent resistance than those containing a reference triol. Compared to the triol and polyester HBPs, polyether HBPs imparted lower Tg and hardness but a better flexibilizing effect to the coatings. At higher R values, the coating solvent resistance decreased except for those with one polyether HBP. A two‐peak phenomenon was discovered in the residual thermal reaction heat curve after photoDSC experiments. These two peaks were found to be related to the thermal relaxation behavior of the photocured inhomogeneous film, and the reactivation and reaction of the ‘trapped living cationic species’. The capability of the polyol to lower the high‐temperature‐peak temperature corresponded well with the flexibilizing ability. Copyright © 2006 Society of Chemical Industry 相似文献