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UV-固化胶黏剂收缩率的研究 总被引:3,自引:0,他引:3
UV-固化胶黏剂固化过程中发生的体积收缩,是影响胶黏剂粘接性能的重要因素.本文分析讨论了UV-固化胶黏剂收缩率的产生原因、影响因素、研究方法,收缩率和收缩应力的关系,以期针对不同的使用需求,找到降低或消除收缩率的有效方法。 相似文献
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合成了一种UV固化环氧丙烯酸树脂TTA,其分子中同时含有环氧基团和双键基团,可满足低收缩性深层阳离子-自由基混合UV固化,固化深度可达到30mm以上,收缩率仅为0.19%。进一步采用自由基树脂(1271)与TTA配合,在快速进行低收缩率深层UV固化同时,可以实现较高的固化程度,树脂固化物热稳定性较好。 相似文献
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以聚酯多元醇、二异氰酸酯和丙烯酸羟乙酯为原料,合成聚氨酯丙烯酸预聚体,并在此基础上通过添加活性稀释单体、光引发剂等配制成UV固化胶黏剂。通过分析不同组分在LCD液晶灌注口密封及金属管脚固定的粘接性能影响,确定合成预聚体所需的聚酯多元醇种类及丙烯酸羟乙酯的合适用量,同时确定配胶所需活性稀释单体与光引发剂的合适用量。最后制得粘接性能好、耐候性能佳,可满足LCD产品生产工艺的性能要求的UV固化胶黏剂。 相似文献
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介绍了ABS透明塑料基材的特性,测试出ABS透明塑料基材的表面能,针对ABS基材表面特性,分析了粘接过程中使用市售双组份胶黏剂粘接出现的问题,阐述了紫外光固化胶黏剂的优点,从ABS基材粘接用胶黏剂的选型、配方的研制、基材表面处理、涂布与粘接工艺、固化等方面进行优化设计。实验证明:采用自制的、无需配制的、直接使用的紫外光和热双重固化的胶黏剂,且预聚物和稀释剂配比保持在52∶43,光引发剂含量为3%,热引发剂含量为1. 5%,其表面能比市售胶黏剂降低了11 m N/m,其粘接强度最佳,通过基材处理、改善粘接工艺,完善固化条件,克服氧阻聚,提高固化度等,使ABS透明塑料基材粘接强度达到18 MPa以上。 相似文献
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Two different monosaccharide acrylate monomers were designed and synthesized from glucose and galactose, and were then used to prepare transparent acrylic pressure sensitive adhesives (PSAs) comprised of semi-interpenetrated structured polymer networks. The effects of the monosaccharide architecture in the acrylate monomers on the adhesive performance of the acrylic PSAs were investigated. Prepared UV-curable acrylic PSA syrups were characterized and the optical properties of the acrylic PSAs were also examined. All of the acrylic PSAs exhibited high transparency in the visible wavelength region. With increasing monosaccharide acrylate concentration in the acrylic PSAs, adhesive performances such as the peel strength, cohesion strength, and probe tack were increased. However, there was no difference in their adhesive performances regardless of the different chemical structures of monosaccharide acrylate monomers. 相似文献
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Butyl acrylate and methyl acrylate copolymers were prepared and evaluated as pressure‐sensitive adhesives. The effects of polymerization conditions such as the temperature, time, amounts of the monomers, and feeding method on the molecular weight, molecular weight distribution, and composition of the resultant copolymers were investigated. The adhesive properties were evaluated in terms of the viscosity, peel strength, and hold time. The best molar ratio of methyl acrylate in the copolymer was 0.466 for pressure‐sensitive adhesives. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 1535–1542, 2006 相似文献
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环氧改性醇溶性丙烯酸酯干式复膜胶的研制 总被引:1,自引:0,他引:1
介绍了一种新型环氧改性醇溶性丙烯酸酯干式复膜胶的制备方法和性能。首先以环氧树脂E-44和丙烯酸(AA)为原料,合成了一种丙烯酸环氧单酯(EA);再以乙醇为溶剂,采用半连续加料法合成了醋酸乙烯酯(VAc)、丙烯酸丁酯(BA)、丙烯酸2-乙基己酯(2-EHA)和EA四元共聚物。该复膜胶合成的适宜条件为:m(VAc)∶m(BA)∶m(2-EHA)∶m(EA)=40∶25∶20∶15,w(引发剂)=1.0%,反应温度为73℃,反应时间为7h。实验结果表明,该复膜胶可用于制备塑料复合薄膜,具有环保、无毒、剥离强度高和快速固化等特点,适用于快速干式复合薄膜的生产线。 相似文献
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以丙烯酸乙酯(EA)和丙烯酸丁酯(BA)为软单体、甲基丙烯酸甲酯(MMA)为硬单体、甲基丙烯酸(MAA)和丙烯酸(AA)为功能单体,采用种子乳液聚合法制备出一种新型丙烯酸酯乳液胶粘剂。结果表明:当m(EA)∶m(BA)∶m(MMA)=19.2∶6.4∶6.4、m(MAA)∶m(AA)=2.00∶1、w(MAA+AA)=w(BA)=6%~8%以及经氨水中和后胶液的pH为7~8时,该胶粘剂具有良好的综合性能,其初粘强度大、干燥速率快、耐冷藏性能好、不起皱、不掉标且易清洗,完全满足啤酒瓶贴标用胶粘剂的使用要求。 相似文献
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胶黏剂在陶瓷的修复、生产和连接等许多方面起着重要的作用,综述了陶瓷用胶黏剂的研究现状,在简要介绍陶瓷结构性能的基础上,重点介绍了应用于陶瓷领域的磷酸盐类胶黏剂、硅酸盐类胶黏剂、氧化物类胶黏剂等无机胶黏剂和环氧树脂胶黏剂、酚醛树脂胶黏剂、丙烯酸脂类胶黏剂等有机胶黏剂近年来国内外的研究情况,以促进陶瓷用胶黏剂的发展。 相似文献
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碘鎓盐引发的环氧—丙烯酸酯复合光敏胶的研制 总被引:4,自引:4,他引:0
用合成的二苯基碘钅翁六氟磷酸盐作光引发剂 ,对不同比例的双酚A环氧树脂E5 1 和丙烯酸酯预聚物AE组成的复合树脂进行了光固化研究 ,证明了碘钅翁盐具有同时引发环氧和丙烯酸酯复合树脂按阳离子和自由基两种不同机理进行光固化的能力 ;考察了树脂的不同比例对固化速度的影响 ;同时选择一定比例的光敏复合树脂研究了增感剂 (DA)对光固化速度的影响。结果表明 ,这种复合光敏胶具有粘度低 ,光固化速度快 ,粘合力强 ,玻璃化转变温度低 ,耐水煮沸性好的优点 ,可作为新型UV -固化胶粘剂和防水性密封胶加以应用。 相似文献
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In an attempt to control the adhesive properties of acrylic copolymer‐based pressure‐sensitive adhesives, a series of multifunctional acrylate monomers were added and UV cured. The adhesive compound with a difunctional monomer had increased peel strength after UV curing. On the other hand, the compound with a tri‐ or more functional (polyfunctional) monomer had markedly decreased strength after UV curing. Those adhesives containing any polyfunctional monomer also showed much higher storage modulus than an adhesive containing a difunctional monomer. The greater volume contraction of UV‐cured polyfunctional monomer suggested microvoids at the interface between the adhesive layer and the adherent, resulting in poor strength. Estimated values of the peel strength of UV‐cured adhesives according to the theoretical equations proved that the strength is approximately inversely proportional to the elastic moduli. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2889–2895, 2004 相似文献