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采用菜籽油、巯基乙醇、丙烯酰氯为原料,通过巯基-烯加成、酯化等一系列反应合成了菜籽油基多元烯化合物,使之与不同官能度的硫醇单体固化成UV固化涂膜,探究了硫醇单体对UV固化涂膜性能的影响。并探究了三羟甲基丙烷三丙烯酸酯(TMPTA)对菜籽油基UV固化涂膜性能的影响。通过核磁(1H NMR)、红外(FT-IR)、热重分析(TGA)、动态机械分析(DMA)对单体结构和涂膜的性能进行了表征。结果表明:随着硫醇单体官能度增加,UV固化涂膜的交联密度增大,铅笔硬度、模量、拉伸强度、断裂伸长率、玻璃化转变温度也随之增大。另外,实验结果还证实了TMPTA作活性稀释剂能提高菜籽油基UV固化涂膜的机械性能和热稳定性。 相似文献
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以异氟尔酮-二异氰酸酯(IPDI)、聚乙二醇(PEG)、N-羟甲基丙烯酰胺等为主要原料,利用大单体合成技术,制备了两端由丙烯酰胺基团封端的聚氨酯大分子单体。该大分子单体具有良好的光敏特性,将其在紫外光照射下交联固化得到一种新型的透明高分子材料。研究探讨了大单体的固化机理、紫外光辐照时间及光引发剂对大单体固化度的影响,结果表明:该大单体在紫外光灯源下照射3 h,其固化度达73%左右;当向体系中加入1%的光引发剂后,在紫外光灯源下照射6 h,其固化度可达95%左右。 相似文献
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采用袋式法对固化后的胶粘剂中丙烯酰胺及丙烯酸酯类残留单体进行释放量测定,研究了固化时间、试验温度及加热时间对这两类物质释放量的影响。研究结果表明:适当延长固化时间,对减少胶粘剂固化后的单体残留有明显作用;袋式法中试验温度为60℃时,胶粘剂中残留单体的释放量远大于试验温度为40℃对应的释放量,表明温度对胶粘剂残留单体的释放具有较大的影响;气袋的加热时间不同会对胶粘剂中残留单体的释放量造成影响,因此应选择合适的加热时间,避免残留单体未检出或过饱和情况;通过对各类胶粘剂固化后的残留单体进行释放量和含量情况分析,可以更加充分地了解各类胶粘剂的组成成分及环保性能;数据对比结果表明,胶粘剂中丙烯酰胺及丙烯酸酯类残留单体的释放量与含量基本呈正相关。 相似文献
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在甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)混合单体中分别加入功能单体甲基丙烯酸(MAA)和甲基丙烯酸乙酰乙酰氧基乙酯(AAEM),合成了丙烯酸酯树脂(WA)。用氮丙啶作固化剂制备了WA/氮丙啶双组分水性涂料。研究了氮丙啶的用量、功能单体的用量和固化温度对WA/氮丙啶水性涂料固化涂膜的物理机械性能及耐水性的影响,并与WA/氨基树脂水性涂料固化涂膜的性能作了对比。结果表明:随着氮丙啶和功能单体用量的增加,WA/氮丙啶固化涂膜的耐水性先提高后下降,其他性能变化不大,当功能单体用量在9%~11%,氮丙啶用量在20%~30%,在130℃固化30min时,WA/氮丙啶固化涂膜便具有优良的物理机械性能和耐水性能,而WA/氨基树脂涂层需在氨基树脂用量为40%、固化温度为160℃(30 min)时,其固化涂膜的物理机械性能和耐水性能才能达到相同的水平。 相似文献
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《合成材料老化与应用》2016,(5)
采用预乳化种子半连续聚合的工艺,以反应性乳化剂代替小分子乳化剂,苯乙烯、甲基丙烯酸甲酯、丙烯酸丁酯、丙烯酸和丙烯酸羟乙酯为共聚单体,制备了无皂苯丙乳液,并使用固化剂对其进行交联固化,制备耐水性好的苯丙固化漆膜。通过傅里叶变换红外光谱(FT-IR)对苯丙聚合物及其固化漆膜进行了表征,探讨了反应性乳化剂用量对转化率、凝聚率、乳胶粒粒径、Zeta电位、乳液稳定性及其苯丙固化漆膜性能的影响。结果表明,反应性乳化剂与苯丙单体进行了共聚,固化剂与苯丙树脂产生了固化交联反应。随着反应性乳化剂用量的增加,单体转化率提高,凝聚率降低,乳胶粒粒径减小,乳胶粒表面所带电荷增多,乳液稳定性提高。当乳化剂用量为3%时,苯丙固化漆膜耐水性最好,此时固化漆膜在40℃去离子水中浸泡10天不发白和不脱落。 相似文献
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分析本公司PET单体的输送流量、管道阻力降、单体黏度和温度,讨论了单体重力流管道的计算方法,对单体泵进口管道的配管重新进行了设计计算,评估改造效果。 相似文献
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Synthesis of fluorosilicone monomer and application in hydrophobic surface of acrylic copolymer
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A kind of fluorosilicone monomer with polymerizable vinyl group and fluorine and silicon components has been designed and synthesized. A series of acrylic copolymers were prepared using the monomer and normal acrylic monomers. The effects of the monomer on the surface properties and thermostability of the copolymers were studied. The chemical structure of the monomer and the copolymers were confirmed by FTIR, 1H NMR, and 19F NMR. MALDI‐TOF‐MS was used to monitor the molecular weight variation during the monomer synthesis process. Thermal properties of the copolymers were analyzed by DSC and TGA. Surface properties of the copolymer films were characterized by static water contact angles, AFM, and XPS. Results showed that the fluorosilicone monomer with the expected structure was synthesized and had been copolymerized into the copolymers. The monomer contributed to a uniform hydrophobic film with no influence on the surface roughness. The thermostability of the copolymers was improved by the monomer. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132, 41926. 相似文献
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J. L. Osborne G. C. Sarti W. J. Koros H. B. Hopfenberg 《Polymer Engineering and Science》1983,23(9):473-488
Efforts to remove traces of monomers contained in polymers by stripping with steam have resulted in reports that a small concentration of monomer is inextractable, or “locked-in,” the polymer. Any concomitant depolymerization to monomer and diffusive elution of the formed monomer would, in the steady state, result in a constant concentration of monomer within the confines of the polymer. If only the polymer phase were sampled and depolymerization were ignored, this result could be interpreted as an apparent “zero migration” level of monomer. A model that describes the coupled processes of depolymerization and diffusion is presented; predictions and estimates of an apparent “zero-migration” concentration are offered for various polymer/monomer systems considering a variety of kinetic schemes. The effects of temperature, geometry, and sample size on the transient and apparent steady-state, residual-weight fraction of monomer in the polymer are considered. Also, the weight fraction of monomer, neglecting diffusive elution, is estimated for comparison with the steady-state weight fractions calculated for the case in which diffusive elution significantly lowers the residual steady-state monomer level. The results predicted by the model presented are compared with experimental data reported in the literature. Transient approaches to the steady state are included in the model analysis. The steady-state monomer concentrations predicted for polystyrene and poly(acrylonitrile) at 100°C vary from 0.0001 ppm to 100 ppm as the diameter of the respective polymeric spheres varies between 0.5 μ and 500 μ. The predicted steady-state concentrations for vinyl chloride monomer in poly(vinyl chloride) are, under comparable conditions, seven orders of magnitude lower, reflecting the extraordinarily small tendency of polyvinyl chloride to degrade to monomer. 相似文献
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丙烯酸酯核壳乳液合成及涂料耐沾污性的研究 总被引:1,自引:0,他引:1
讨论了丙烯酸酯乳液核壳单体中软硬单体的比例、壳层中掺交联单体、有机硅单体以及核壳乳液聚合中可聚合乳化剂的用量对丙烯酸酯外墙涂料沾污性的影响。结果表明,在壳层中HEMA的掺量以1.5%、可聚合乳化剂用量以1%~2%、有机硅单体掺量以4%时,有利于丙烯酸酯核壳乳胶涂料耐沾污性的提高。 相似文献