共查询到18条相似文献,搜索用时 64 毫秒
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阴离子型乳化剂二羟甲基丁酸的应用研究 总被引:4,自引:0,他引:4
分别选用二羟甲基丙酸(DMPA)和二羟甲基丁酸(DMBA)作为内乳化剂制备阴离子型聚氨酯乳液,测试研究了两种乳化剂对聚氨酯乳液各种性能的影响。结果表明,与DMPA相比,用DMBA作为阴离子型内乳化剂制备聚氨酯乳液具有以下特性:①DMBA的熔点为105℃,故可以在此温度下熔化/溶解在多元醇中;②用DMBA合成聚氨酯预聚体的反应时间(约50~60min)远小于用DMPA的反应时间(约150~180min);③用DMBA制备聚氨酯乳液涂膜吸水前后的拉伸强度和断裂伸长率都大于用DMPA制备的聚氨酯乳液涂膜;④以DMBA为内乳化剂制备的APU乳液粒径大而分布窄。因此,DMBA作为阴离子型乳化剂用于制备聚氨酯乳液具有良好的应用前景。 相似文献
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以异佛尔酮二异氰酸酯(IPDI)、二羟甲基丁酸(DMBA)和聚四氢呋喃醚二醇(PTMG)等为主要原料,制得聚氨酯(PU)预聚体;然后将其与丙烯酸羟乙酯(HEA)反应,制得HEA封端的聚氨酯丙烯酸酯(PUA)预聚体;最后在PUA预聚体中加入中和剂等助剂,制备出阴离子改性PUA紫外光(UV)固化胶粘剂。研究结果表明:当w(DMBA中-COOH)=1.2%(相对于PU预聚体质量而言)、中和度=n(中和剂)∶n(DMBA)=80%、以PTMG为多元醇且偶联剂采用预处理法加入时,相应的阴离子改性PUA型UV固化胶粘剂的耐水性、粘接强度和耐久性俱佳。 相似文献
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对聚合物多元醇在聚氨酯微孔弹性体中的应用进行了研究。考察了聚合物聚醚多元醇及聚合物聚酯多元醇对聚氨酯微孔弹性体力学性能的影响。实验结果表明,该类聚合物多元醇的引入可使聚氨酯微孔弹性体制品的力学性能得到较大改善,因此该类聚合物多元醇在聚氨酯领域必将具有广阔的应用前景。 相似文献
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一、前言聚醚或聚酯多元醇(简称多元醇)是聚氨酯的主要原料之一。其组成结构、分子量和官能度的可调范围广,对聚氨酯成型工艺和性能的影响较大。人们为使聚氨酯工业的发展久盛不衰而不断地精心研究、奋力开拓新的多元醇或对通用多元醇进行改性。其中聚合物多元醇乃是至今最成功的改性多元醇。 相似文献
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In this article, a series of blocked waterborne polyurethanes (BWPUs) were synthesized by isophorone diisocyanate, polyols, dimethylol butanoic acid (DMBA), and 3,5-dimethylpyrazole. BWPUs were applied to digital inkjet printing of textiles. The successful synthesis and deblocking of BWPU were confirmed by Fourier transform infrared spectroscopy and differential scanning calorimetry. The colorfastness was improved by deblocking the terminal NCO groups at 140 °C, which could react with fiber. This article presented a characterization method of filtering rate to evaluate the fluency of inkjet printing. Besides, the digital microscope was used to investigate the pigment transferred to the white test cloth. In the end, we chose poly(ethylene glycol adipate) 2000 as the polyol, 1,4-butanediol as the chain extender, 1.6 as the NCO/OH molar ratio, and 4% as the mass fraction of DMBA. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47765. 相似文献
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S. H. Kim M. C. Lee H. D. Kim H. C. Park H. M. Jeong K. S. Yoon B. K. Kim 《应用聚合物科学杂志》2010,117(4):1992-1997
Clay was intercalated and exfoliated by neutralized dimethylol butanoic acid (DMBA) and used to fabricate rigid polyurethane foam (RPUF)/clay nanocomposites. Cream time, gel time, and tack‐free time increased with the addition and increasing amount of clay whereas foam density and compression strength decreased. Cell size, closed cell content, volume change upon heating and cooling, and thermal conductivity of the foam decreased with the addition and increasing amount of clay with a minimum at 2 pphp (parts per 100 polyol by weight). The glass transition and decomposition temperatures increased with increasing clay content due to the restricted motion of chains and barrier property of the clay platelets. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2010 相似文献
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Honghai Dai Liting Yang Bo Lin Chengshuang Wang Guang Shi 《Journal of the American Oil Chemists' Society》2009,86(3):261-267
Three soy-based polyols intended for application in polyurethanes were prepared by ring opening the epoxy groups in epoxidized
soybean oil (ESO, 0.385 mol/100 g epoxy rings) with methanol, 1,2-ethanediol and 1,2-propanediol in the presence of tetrafluoroboric
acid catalyst. The effect of the different opening reaction reagents, different low molecular weight alcohols, on the polyols
was investigated by spectroscopic, chemical and physical methods. The viscosities, viscous-flow activation energies, molecular
weight and melting point of the samples increased in the following order: polyol (3) > polyol (2) > polyol (1) > ESO [polyol
(1); polyol (2) and polyol (3) represented the samples synthesized from the same epoxidized soybean oil generated by opening
reactions with methanol, 1,2-ethanediol and 1,2-propanediol, respectively]. All the samples were crystalline solids below
their melting temperature, displaying multiple melting point peaks. Compared with polyol (1), polyol (2) had a primary hydroxyl
group, promoting the reactive activity of the polyol with isocyanates; polyol (3) contained large numbers of hydroxy groups,
improving the properties of polyurethanes. 相似文献
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介绍了新型环保涂料中间体材料──聚碳酸亚酯多元醇的生产合成与应用,揭示了其在水性工业涂料中的功用。介绍了国内研发和生产该材料的企业或单位,对其未来市场需求作了重点说明和分析。 相似文献
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Jicheng Xu Xinshan Rong Tongyao Chi Ming Wang Yingying Wang Dongya Yang Fengxian Qiu 《应用聚合物科学杂志》2013,130(5):3142-3152
Hydroxyethyl methyl acrylate (HEMA) capped waterborne polyurethane‐acrylate (WPUA) oligomer was firstly prepared from isophorone diisocyanate (IPDI), polyether polyol (NJ‐220), dimethylolbutanoic acid (DMBA), HEMA via in‐situ and anionic self‐emulsifying method. Ultraviolet (UV) curable WPUA coating was obtained from HEMA‐capped oligomer, butyl acrylate (BA) and multifunctional acrylates (TPGDA) as reactive diluents, and Darocur 1173 as photoinitiator. The physical properties of WPUA oligomers, such as particle size, apparent viscosity, and surface tension were investigated. Some mechanical properties of UV‐WPUA films, such as contact angles, thermal properties, and solvent (water, HCl, NaOH, NaCl, and ethanol) resistance of UV‐WPUA coating films were measured. The surface morphologies were measured by scanning electron microscope and atomic force microscope. The surface free energy of the UV‐cured film was calculated from contact angle measurements using the Lewis acid–base three liquids method. The specific UV‐WPUA coating was selected to protect the iron materials that observed the effect of the protection. The results indicate that the prepared UV‐WPUA coating has excellent protective behavior to metal iron materials and may offer some contributions to protect iron cultural relics. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 3142–3152, 2013 相似文献
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将自制的PIPA多元醇用于发泡,对其进行各种性能测试,结果发现:用PIPA多元醇制备的泡沫,对泡沫的密度、回弹率、压陷硬度等性能都有不同程度的影响;在同样配方条件下,相对于不含PIPA多元醇的试样泡沫,有着更好的力学性能;高固含量PIPA多元醇泡沫相对于POP多元醇泡沫,具有更好的压陷硬度、回弹率、拉伸强度、伸长率以及撕裂强度等机械性能。 相似文献
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Monolithic energetic gels were prepared in acetone by separately cross‐linking the single precursors, glycidyl azide polyol (GAP polyol polyol), nitrocellulose (NC, 12% N), and tris(hydroxymethyl)nitromethane (THMNM) and the mixed precursors (GAP polyol+NC) and (GAP polyol+THMNM) with hexamethylene diisocyanate (HDI). THMNM functions as a chain extender. The synthesis conditions were optimized according to precursor mass ratio, cross‐linking agent, solvent, catalyst concentration, and containers with various surface‐to‐volume ratios. The concentrations of reactants and cure catalyst are the most important factors. The composite energetic materials with a high degree of homogeneity were synthesized by trapping hexanitrohexazaisowurtzitane (CL‐20) on the nano scale in the energetic polymer gels using sol gel processing with a modified freeze‐drying procedure. Loadings up to 85%, 93%, and 90% by weight of CL‐20 yielded, respectively, monolithic gels for GAP/HDI, NC/HDI, and THMNM/HDI. 90% CL‐20 can be loaded into gels of the mixed precursors of (GAP polyol+NC) and (GAP polyol+THMNM). The energetic gels and composites were characterized using FT‐IR spectroscopy, DSC, SEM, and sensitivity to drop weight impact. The sensitivity of CL‐20 is reduced in the energetic nanocomposites. 相似文献