共查询到20条相似文献,搜索用时 62 毫秒
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与传统的压敏胶制备类型(溶剂型、乳液型和热熔型)不同,本文提出了第四种制备压敏胶的类型,即辐射固化型(主要是UV辐射),使用新技术以消除压敏胶制造过程中使用的溶剂和分散介质。UV压敏胶技术还可分为热熔型UV压敏胶和常温涂布型UV压敏胶两种。其中热熔型UV压敏胶需进行加热,以使涂布过程容易进行。在此类压敏胶的聚合物中含有UV敏感性化合物,以利于交联反应的进行,并提高压敏胶产品的剪切性和高温性能。常温涂布型UV压敏胶是液态的,其粘度适合常温涂布。大多UV固化压敏剂只是最近几年才开始商业化。丙烯酸共聚物本身具有压敏的性质,很适于制备辐射固化压敏胶粘剂。常用的常温涂布UV压敏胶粘剂包括热塑性弹性体溶于丙烯酸单体所形成的体系、丙烯酸化的丙烯酸聚合物溶于丙烯酸单体所形成的体系和丙烯酸聚氨酯溶于丙烯酸单体所形成的体系。当在光引发剂存在下,用UV光照射,则丙烯酸单体发生反应生成聚合物而成为胶粘剂的一个组成部分。用于此类胶粘剂体系的常用反应性稀释剂有丙烯酸2-乙基己酯、乙氧基化丙烯酸壬基酚酯和乙氧基化丙烯酸乙酯等。 相似文献
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阐述了厚膜型低温固化环氧防锈漆的研究方法。论述了厚膜型可低温固化环氧防锈漆所具备的良好性能。通过成功应用于上海浦东机场二期工程的案例,阐明了该涂料优良的施工性和防腐性能。 相似文献
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本文研制了一种高温固化无孔蜂窝结构胶粘剂,讨论了增韧剂、固化剂用量对胶粘剂性能的影响,介绍了胶粘剂的基本性能和耐久性能。 相似文献
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选用合适单体合成高反应活性聚酯树脂,介绍了树脂的合成工艺,以高亚氨基部分醚化氨基树脂为交联剂,自制二壬基二磺酸为催化剂,制成低温固化卷材涂料。所制备的涂料具有很好的耐候性和加工成型性能。讨论了影响涂料性能的因素。 相似文献
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以苯基乙烯基硅树脂、苯基乙烯基硅油、含氢硅油、增粘剂等为原料,制成了双组分加成型高折射率LED封装胶。研究了原料对其耐高低温冲击性能的影响。结果表明:在苯基乙烯基硅树脂中引入5%的γ-环氧丙氧基丙基三甲氧基硅烷、配胶时将黏度为5000mPa·s和300mPa·S的苯基乙烯基硅油按10:2的质量比混合使用、交联剂采用活性氢质量分数为0.43%的苯基含氢硅油、增粘剂含环氧基和氢基的预聚物的质量分数为1%,按此配方配成的LED封装胶用于5050、5730灯架进行测试,完全固化后先过3次回流焊,然后在-40-+100℃的冷热冲击测试试验机中进行测试,经过500个循环后,封装胶无裂胶、胶脱底和胶片脱落、死灯等现象。 相似文献
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Kenji Umemura Shuichi Kawai Hikaru Sasaki Ryozo Hamada Yasusi Mizuno 《The Journal of Adhesion》1996,59(1):87-100
Steam-injection pressing is a recent development for manufacturing wood products. The curing mechanism and behavior of wood adhesives during steam-injection heating and hot-platen heating may cause differences in both chemical and physical aspects. The curing of wood adhesives under high steam pressure using an especially designed reaction cell is discussed. The adhesives used in this study were phenol-formaldehyde (PF), urea-formaldehyde (UF), melamine-formaldehyde (MF), and isocyanate (IC) resins. At different curing times, the heating temperature (steam pressure) applied to cure the adhesives was 160°C (6 kgf/cm2). Results were examined by analytical methods using FR-IR, 13C-NMR, dynamic mechanical analysis and solvent extraction. (1) By steam-injection heating, PF resin immediately cured to some degree in a few minutes and maintained an equilibrium situation. In this case, the reaction was accompanied by the disappearance of the ether structure. (2) In UF resin, results from IR data clarified different reactions between hot-platen heating and steam-injection heating. During steam-injection heating, as heating time increased, UF resin returned to its liquid state under the influence of hydrolysis. (3) MF resin was almost cured under steam-injection in a short heating time compared with hot-platen heating. (4) IC resin foamed and cured in a short heating time under steam-injection. It was proved that steam-injection heating was more effective than by hot-platen heating for IC resin. 相似文献