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A/U-g-A型核壳聚氨酯-丙烯酸酯复合乳液的合成 总被引:1,自引:0,他引:1
通过加入双官能团单体甲基丙烯酸-β-羟乙酯(HEMA),采用溶液聚合法和原位乳液聚合法,把聚氨酯与丙烯酸(AA)、丙烯酸丁酯(BA)和苯乙烯(St)等丙烯酸酯单体接枝共聚,合成了PUA为壳、PA为核的聚氨酯-丙烯酸酯(PUA)复介乳液.研究了壳层PA/Pu、总PA/PU、核壳比、BA/St、壳层HEMA/PA和链转移剂含量对乳液制备过程、乳液及涂膜性能的影响.研究结果表明:PUA中的PA、BA、St、HEMA,链转移剂和DMPA与AA中的-COOH的含量(壳层PUA的质量分数)分别为55.6%、25%、17.8%、9%、1%和7%,核壳质量比为1:4时,复合乳液涂膜结构规整,各项性能较好.PUA胶粒的平均粒径在100 nm左右时,分布更均匀. 相似文献
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核壳型水性聚氨酯-聚丙烯酸酯复合乳液的制备及其影响因素 总被引:2,自引:0,他引:2
用丙烯酸酯改性水性聚氨酯(PU)制备了具有核壳结构的PU-聚丙烯酸酯(PA)复合乳液,对其结构进行了表征,研究了亲水性扩链荆二羟甲基丙酸(DMPA)用量、NCO/OH(摩尔比)、乳化剂用量、核壳质量比对乳液和涂膜性能的影响.结果表明,所制备的乳液为核壳型PU-PA复合乳液;当DMPA的质量分数为5.5%-6.0%、NCO-OH总摩尔比为1.3-1.4、NCO/OH初始摩尔比为4.5-5.5、乳化荆质量分数为1.0%、核壳质量比为30/70时,可得到性能较佳的PU-PA复合乳液和涂膜. 相似文献
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采用核壳聚合工艺合成了一种烤漆用羟基丙烯酸乳液,考察了核单体与壳单体的质量比、链转移剂及其用量、羟值和酸值对烤漆性能的影响。结果表明,当核壳单体质量比为3∶4,链转移剂(十二烷基硫醇)为单体质量分数的1.0%,以丙烯酸为酸类单体来控制体系的酸值(以KOH计)为14 mg/g,以丙烯酸羟丙酯为羟基单体来控制羟值(以KOH计)为64.5 mg/g时,所得乳液具有良好的机械稳定性和氨基树脂混溶稳定性。以此乳液制备的涂料具有良好的综合性能:60°光泽90,硬度2H,耐冲击性(1 kg)50 cm,耐100次以上酒精擦试,耐超过96 h的常温水浸泡,耐盐雾腐蚀时间达到96 h。该羟丙乳液适用于制备低VOC水性环保金属烤漆。 相似文献
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《有机硅材料及应用》2010,(4):217-217
陕西科技大学的马建中等人采用单体预乳化法和半连续种子乳液聚合法合成了核壳型硅丙复合乳液,研究了壬基酚聚氧乙烯醚-2-璜酸基琥珀酸单酯二钠盐(MS-1)与十二烷基硫酸钠(SDS)复配比列、核层聚合乳化剂补加速率及壳层聚合乳化剂补加速率对乳液性能和乳胶粒粒径及其分布的影响。 相似文献
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核壳型水乳性纸塑复合胶粘剂的研制 总被引:3,自引:0,他引:3
以丙烯酸酯为主要原料,通过种子乳液聚合法合成核壳型水乳性纸塑复合胶粘剂.讨论了单体的选择和配比、引发剂、PVA保护胶体、乳化剂用量、聚合时间等因素对聚合反应及复合胶性能的影响. 相似文献
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采用半连续加料乳液聚合方法制备了硅溶胶/聚丙烯酸酯核/壳结构聚合物,采用动态光散射方法跟踪了复合乳胶粒的粒径随反应进程的变化,其理论粒径与实测值基本一致,说明该聚合过程没有明显的二次成核过程。考查了壳层硬单体-甲基丙烯酸甲酯(MMA)含量对乳液聚合的影响,通过动态热机械分析仪(DMA)对聚合物的黏弹性能进行了表征,对制成的胶粘剂进行了压敏特性的测定,并与复合粒子的分子结构进行了关联。研究表明,随着MMA含量的增加,压敏胶的初粘性略有下降,而持粘性显著提高,剥离强度呈先升后降的趋势。 相似文献
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水性聚氨酯胶粘剂的研究进展 总被引:2,自引:0,他引:2
随着人们生活水平的提高和环保意识的增强,水性聚氨酯胶粘剂必然将取代溶剂型聚氨酯胶粘剂。论文综述了水性聚氨酯胶粘剂的制备方法、优点及存在的不足、改性方法及效果。最后对水性聚氨酯胶粘剂的发展现状进行了分析,并对其发展趋势进行了展望。 相似文献
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Waterborne adhesives are extremely environment‐friendly but unfortunately deficient in mechanical properties. In this article, nanosilica, stemming from tetraethyl orthosilicate (TEOS), silica sol, and/or fumed silica powder, was employed to reinforce the waterborne silylated polyether adhesives. Effects of TEOS content, silica sol content, and the type and content of fumed silica on the shear strength of the adhesive were investigated using a scanning electronic microscope and an electronic instron tester and the strengthening mechanisms of different silica source were discussed. All the shear strengths of silylated polyether adhesives first increased and then decreased as TEOS content, silica sol content or fumed silica content increased. Colloidal silica particles was less efficient than fumed silica particles for reinforcing the polyether adhesive but can increase the shear strength of hydrophobic fumed silica embedded adhesive. Comparing the adhesives with the hydrophilic fumed silica (HS‐5) or the extremely hydrophobic fumed silica (TS‐720), the adhesive with moderate hydrophobic fumed silica (TS‐610) had the highest shear strength. The maximal shear strength of 2.5 MPa was achieved when TEOS, silica sol, and fumed silica were combined. It seemed that TEOS, silica sol, and fumed silica played crosslinking (with polyether chain), dispersing (for fumed silica), and reinforcing roles on waterborne adhesive, respectively. This reinforcing mechanism opened a new way to fabricate waterborne adhesives (or coatings) with high performances. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 相似文献
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A novel soybean oil‐based vinyl‐containing waterborne polyurethane (VPU) dispersion has been successfully synthesized from toluene 2,4‐diisocyanate, dimethylol propionic acid and a 90 : 10 mixture of chlorinated soybean oil‐based polyol and acrylated epoxidized soybean oil (AESO). Then, a series of VPU/acrylic grafted latices have been prepared by emulsion graft copolymerization of acrylic monomers (40 wt % butyl acrylate and 60 wt % methyl methacrylate) in the presence of the VPU dispersion, using potassium persulfate as an initiator. The structure, morphology, and thermal and mechanical properties of the resulting latices, containing 15–60 wt % soybean oil‐based polyols as a renewable resource, have been investigated by Fourier transform infrared spectroscopy, solid state 13C NMR spectroscopy, transmission electron microscopy, thermogravimetric analysis, dynamic mechanical analysis, and mechanical testing. The results indicate that graft copolymerization of the acrylic monomers onto the VPU network occurs during emulsion polymerization, leading to a significant increase in the thermal stability and mechanical properties of the resulting miscible grafted latices. This work provides new environmentally‐friendly latices from a renewable resource with high performance for coating applications. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011 相似文献
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综述了水性聚氨酯的改性方法,包括环氧树脂改性、丙烯酸酯改性、有机硅改性、有机氟改性、纳米材料改性、复合改性。比较了各种改性方法的优缺点,指出了水性聚氨酯胶粘剂所存在的问题,展望了水性聚氨酯胶粘剂改性发展趋势。 相似文献
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乳液聚合法是制备水性含硅聚合物最常见、最有效的方法。介绍了种子乳液聚合、核/壳乳液聚合、无皂乳液聚合、微乳液聚合、互穿网络聚合等制备水性含硅聚合物的方法,并对水性含硅聚合物涂料的应用做了探讨。 相似文献