共查询到19条相似文献,搜索用时 125 毫秒
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阳离子型水性聚氨酯制备和应用 总被引:2,自引:0,他引:2
阳离子型水性聚氨酯制备和应用台会文,王农跃,张留成(河北工学院化工系天津300130)关键词聚氨酯,乳液,织物整理剂水性聚氨酯能赋予织物柔软、丰满的手感,改善织物耐磨性、抗皱性、防缩性、回弹性、通透性等。它还能与多种乳液树脂及助剂配合使用,是一类很有... 相似文献
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水性丙烯酸—聚氨酯微乳液的制备及粒子形态 总被引:23,自引:1,他引:23
水性聚氨酯作为一种环境友好材料近年来得到了迅速的发展,并以其优良的性能在皮革业、涂料、印刷、油墨等行业呈现广阔的应用前景[‘’‘j.通常采用IPN等技术制备出复合型水性树脂「‘,‘’,其中具有核壳结构的微乳液尤其受到重视.但研究多集中于微米级乳液的实际应用开发,对于纳米级、杂化型聚氨酯微乳液微观结构的研究却少见报道.本文通过在自乳化聚氨酯中自由基引发聚合丙烯酸类单体,制备出了具有核/壳结构的复合型丙烯酸一聚氨酯微乳液,并对微乳液的粒径、粒径分布、粒子形态及交联结构进行了研究.聚己内酯(220AL),日… 相似文献
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不同异氰酸酯固化的蓖麻油/酚氧树脂聚氨酯的力学性能 总被引:1,自引:0,他引:1
以BF3·OEt2为催化剂,4,4-二羟基二苯基丙烷与环氧氯丙烷反应,生成端羟基的酚氧树脂(A),A与蓖麻油(B)混合,用3种异氰酸酯(TDI、IPDI和HDI)作为固化剂,制得交联聚氨酯。研究了这3种聚氨酯的力学性能及形态与组成和二异氰酸酯结构的关系;改变NCO/OH摩尔比及B与A的质量比,可以制得具有较好力学性能的聚氨酯材料。蓖麻油,酚氧树脂,聚氨酯,力学性能 相似文献
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Heck Cesar A. dos Santos João Henrique Z. Wolf Carlos R. 《Journal of Sol-Gel Science and Technology》2017,81(2):505-513
Journal of Sol-Gel Science and Technology - A series of composites of commercial waterborne polyurethane and hybrid silica were prepared by the sol–gel process through in situ synthesis.... 相似文献
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测定木素磺酸盐和磺化碱木素相对分子质量分布的凝胶色谱法 总被引:2,自引:0,他引:2
用水溶性流动相在Ultrahydrogel柱上测定了木素磺酸盐和磺化碱木素的相对分子质量及其分布。流动相的离子强度和 pH值对样品和标样的保留时间和峰面积都有显著的影响。根据色谱峰的位置、峰面积和样品的分离程度 ,确定以 pH=7.0的0.1mol/LNaNO3 溶液为适宜的流动相。 相似文献
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To improve the ultraviolet resistance and thermal stability of waterborne polyurethane, stable waterborne polyurethane/nano-cerium oxide hybrid dispersions were obtained by adding nano-cerium colloids to previously synthesized waterborne polyurethane dispersions. The dried ceria colloid was characterized by X-ray diffraction (XRD) and high resolution transmission electron microscopy (HRTEM). The XRD results indicated the prepared CeO2 was a face-centered cubic structure. The prepared polyurethane/CeO2 dispersions were studied by dynamic light scattering (DLS), transmission electron microscopy (TEM), UV–Vis spectroscopy and accelerated weathering test. The dried polyurethane/CeO2 films were characterized using thermogravimetric analysis (TGA). The DLS analysis indicated the particles average diameter of hybrids emulsion was bigger than that of the pure waterborne polyurethane dispersion. TG analysis and accelerated weathering test suggested the hybrid latex films had better thermal stability and mechanical properties than those of the pure waterborne polyurethane. The UV–Vis absorption capacity of the dispersions prepared was increasing with the amount of CeO2 colloid increased. 相似文献
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环氧改性水性聚氨酯乳液的制备及其膜性能 总被引:3,自引:0,他引:3
以聚己内酯二元醇(CAPA)为软段,异佛尔酮二异氰酸酯(IPDI)和六亚甲基二异氰酸酯(HDI)为硬段,环氧树脂E-44为大分子交联剂,经相转化法合成了一系列环氧树脂改性负离子水性聚氨酯(EPPU)自乳化乳液,并制备了改性水性聚氨酯的固化膜.通过FTIR、TGA及接触角、力学性能测试对聚合物结构及其膜性能进行了研究.通过原子力显微镜(AFM)观察膜表面形态和表面粗糙度.乳液粒径及粒径分布通过动态激光光散射法(DLLS)测定.FTIR分析表明环氧树脂的羟基和环氧基都参与了发应.TGA表明,环氧树脂的加入可以提高聚氨酯的热稳定性.随着w(E-44)增大,改性聚氨酯膜的拉伸强度得到改善,断裂伸长率减小.随着w(E-44)增大,乳液粒径增大,薄膜的接触角增大,改性后的PU膜表面光滑度下降,拒水性增强. 相似文献
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Preparation and characterization of a mixing soft-segment waterborne polyurethane polymer electrolyte 总被引:1,自引:0,他引:1
The mixing soft-segment WPU(waterborne polyurethane)polymer electrolytes were synthesized by using PEO(poly(ethylene oxide))and PDMS(polydimethylsiloxane)as the soft segments.These polymer electrolytes exhibit good thermal and electrochemical stability.The conductivity of the gel polymer electrolyte is 2.52 x 10~(-3)S/cm at 25℃with the LiTFSI/(DMC+EC) content of 130%. 相似文献
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以自乳化型聚氨酯和甲阶酚醛制备了聚氨酯 酚醛复合水分散液 .pH值与酚醛溶解度的关系表明甲阶酚醛的溶解是酚羟基电离的结果 .聚氨酯 甲阶酚醛水分散液粒子的形态有核壳结构、不完善的核壳结构及纯聚氨酯颗粒三种 ,后者粒径最小 .随着酚醛用量的增大 ,粒子平均粒径增大 .酚醛含量增加使体系热稳定性、机械稳定性、冻融稳定性及临界聚沉值下降 ,pH值稳定范围变窄 .分散液稳定性和电性能考察证明 ,本复合分散液的稳定性主要由分散液的电性能所决定 ,属真溶胶 ,但在一定程度上也具有大分子溶液的特性 .复合液涂膜的性能较纯聚氨酯有所改善 ,尤其在添加了硅溶胶之后 相似文献
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Hsu‐Chiang Kuan Chen‐Chi M. Ma Wen‐Ping Chuang Hsun‐Yu Su 《Journal of Polymer Science.Polymer Physics》2005,43(1):1-12
A novel clay/waterborne polyurethane (WPU) nanocomposite was synthesized from polyurethane and saponite organoclay. The clay was organically modified with various swelling agents, the effect of which has been investigated. Hydrogen bonding between organic and inorganic materials was characterized with Fourier transform infrared (FTIR) spectroscopy. The results implied that hydrogen bonding increased when organoclay was added. Mechanical and wear property studies revealed that introducing clay into waterborne polyurethane will enhance the Young's modulus (from 56 to 126 MPa), the maximum stress (from 3.9 to 7.6 MPa), and the elongation at break (from 27.7 to 58.7%) of the nanocomposite by a factor of two, whereas the wear loss will be only one third of the neat waterborne polyurethane. Atomic force microscopy (AFM) was used to analyze the surface morphology of the nanocomposite. An AFM microphotograph showed that the surface of the clay/waterborne polyurethane nanocomposite was smoother when clay was added in waterborne polyurethane. The average roughness (Ra) decreased from 1.00 to 0.12. © 2004 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 1–12, 2005 相似文献
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