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以St(苯乙烯)为介质,首先将AA(丙烯酸)和环氧树脂E-44进行酯化,然后采用预乳化方法,以酯化产物、St、BA(丙烯酸丁酯)为单体,通过乳液聚合制备了单组分丙烯酸酯改性的环氧树脂乳液,探讨了乳化剂和引发剂用量等对乳液性能的影响。研究结果表明:当环氧树脂用量为25%,n(E-44)∶n(AA)=1∶1.3,m(BA)∶m(St)=6∶4,引发剂用量为0.6%,乳化剂用量为4%时,乳液性能稳定且具有良好的涂膜性能;酯化过程中采用单体St为溶剂,避免了采用其他有机溶剂带来的污染问题,同时单组分结构设计赋予了乳液良好的施工便利性。 相似文献
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采用半连续种子乳液聚合法,以苯乙烯(St)、丙烯酸丁酯(BA)、甲基丙烯酸(MAA)为原料,甲基丙烯酸缩水甘油酯(GMA)和三官能团交联剂三羟甲基丙烷三甲基丙烯酸酯(TMPTMA)为交联单体,制备了高致密性的水性苯丙钢材防腐乳液,考查了GMA、TMPTMA对乳液性能的影响。结果表明,GMA、TMPTMA(核层)用量为3%,可提高乳液的致密性,涂膜交联度95.4%、吸水率6.1%、耐盐雾时间360h。 相似文献
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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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以丙烯酸丁酯、甲基丙烯酸甲酯、苯乙烯、丙烯酸-2-羟乙酯、丙烯酸为反应单体,十二烷基硫酸钠与聚乙二醇辛基苯基醚按质量比2:1组成复合乳化剂,过硫酸钾为引发剂,采用乳液聚合法,制备了苯乙烯改性丙烯酸酯乳液型压敏胶;对乳液型压敏胶进行了粒度分布、初粘性、180°剥离强度测试。研究结果表明,在反应温度为83±2℃、反应时间为6h、复合乳化剂用量为单体总质量的3~5%、引发剂用量为单体总质量的0.6~0.8%、单体质量比BA:MMA:St:HEA:AA为80:5:10:2:3的工艺条件下,可制得粒径分布窄、平均粒径小、初粘性好、剥离强度高的乳液型压敏胶。 相似文献
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以苯乙烯(St)、丙烯酸(AA)、甲基丙烯酸甲酯(MMA)和丙烯酸丁酯(BA)为共聚单体,制备了无皂苯丙乳液;然后以AA含量、中和度、引发剂含量和软/硬单体配比等为试验因素,以乳液稳定性和粒径为考核指标,采用单因素试验法优选出制备无皂苯丙乳液的最佳工艺条件。结果表明:当w(引发剂)=1.2%和w(AA)=4.5%(均相对于单体总质量而言)、中和度为0.8、m(BA)∶m(St+MMA)=4∶6和反应温度为78℃时,可制得粒径为纳米级的高固含量稳定乳液。 相似文献
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通过细乳液聚合法制备含氟丙烯酸酯共聚物(FPA)乳液,采用红外光谱( FT-IR)、透射电镜(TEM)、原子力显微镜(AFM)、热重分析仪( TG)、扫描电镜和表面能谱( SEM-EDS)等对聚合物进行表征,并考察了乳化剂与助乳化剂的物质的量比,氟单体用量和超声时间对乳液粒径的影响。结果表明,甲基丙烯酸六氟丁酯( 6FA)、丙烯酸丁酯( BA)、苯乙烯( St)3种单体成功聚合,乳化剂与助乳化剂的物质的量比为 1.5∶1,超声时间为 60 min,氟单体用量为 10%时,乳液粒径最小且分布较窄,表面张力从 45.028 mN/m降至 33.399 mN/m,且乳胶膜粗糙度增加,热稳定性提高。 相似文献
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以苯乙烯(St)、丙烯酸丁酯(BA)为主要单体,甲基丙烯酸(MAA)、甲基丙烯酸缩水甘油酯(GMA)、乙烯基三乙氧基硅烷(A-151)为交联单体合成了无皂苯丙乳液。研究了反应型乳化剂的种类及用量、交联单体的用量对乳液及涂膜性能的影响。确定反应型乳化剂的最佳用量为单体总量的3%。试验发现:当甲基丙烯酸缩水甘油酯与甲基丙烯酸的用量分别为单体总量的3%和3%时,二者可进行交联,能提高苯丙乳液的交联度和致密性。通过加入缓蚀剂PD-star-102,解决了苯丙乳液初期的闪锈问题,同时对涂膜的耐盐水性能有所提高。 相似文献
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以苯乙烯(St)、甲基丙烯酸甲酯(MMA)、丙烯酸-2-乙基己酯(2-EHA)、丙烯酸-2-羟基乙酯(HEA)和丙烯酸(AA)为反应单体,利用天然松香乳液作为改性剂,通过乳液聚合的方式制备了松香-苯丙复合乳液。研究了乳化剂用量、引发剂用量、松香乳液用量和单体配比对乳液性能的影响。并通过TGA、DLS、TEM对所制备的复合乳液进行了表征。结果表明:当乳化剂用量为单体质量的5%、引发剂用量为单体质量的0.8%、松香乳液用量为单体质量的30%、m(硬单体)∶m(软单体)=2.5∶1时,制得的乳液呈白色泛蓝光,粒径为131 nm。成膜后,漆膜光滑透明,硬度(1H)、耐水性(接触角97.05°)和附着力(1级)等性能良好。 相似文献
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With monodispersed poly(methyl methacrylate/n‐butyl acrylate/acrylic acid) [P(MMA/BA/AA)] seeded latex with a particle size of 485 nm and a solid content of 50 wt % as a medium, a series of stable P(MMA/BA/AA)/poly(styrene/acrylic acid) composite latexes with a high solid content (70 wt %) and low viscosities (500–1000 mPa · s when the shear rate was 21 s?1) was prepared in situ via simple two‐step semicontinuous monomer adding technology. The coagulum ratio of polymerization was about 0.05 wt %. The particle size distribution of such latexes was bimodal, in which the large particle was about 589 nm and the small one was about 80 nm. The latexes combined good mechanical properties with good film‐forming properties. Differential scanning calorimetry showed that the corresponding latex film had a two‐phase structure. The morphology of the latex film was characterized with atomic force microscopy and scanning electron microscopy. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 1815–1825, 2007 相似文献
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Summary Stable organosilicon-acrylate copolymer latexes with high silicon content were prepared by seeded semibatch emulsion polymerization
of butyl acrylate (BA), methyl methacrylate (MMA) with a novel branched organosilicon monomer 3-methacryloxypropyl tris(trimethylsiloxy)
silane (MPTS). Monomer conversion, evolution of the particle size and its distribution were monitored by dynamic light scattering.
The effects of MPTS on the polymerization kinetics, the nucleation mechanism and properties of latex were investigated. The
results indicated that, in addition to micellar nucleation, a coagulative nucleation step was also observed as a result of
the addition of the organosilicon monomer, accordingly, the particle number of the silicon-acrylate latexes increased, the
average particle diameter decreased and the polymerization rate accordingly increased compared to those of the acrylate latexes
without organosilicon monomer. Moreover, the particle size distribution presented bimodal curves, which indicated that there
were large particles formed at an early stage. However, the particle size distribution curves became monomodal at the later
stage, and the final latex shows a narrow particle size distribution. It was found that the properties of latex and latex
film were obviously influenced by MPTS content. With increasing MPTS content, latex film glass transition temperature and
water absorption ratio decreased, the degradation temperature and water contact angle were increased. Hence, the resulting
latex films containing MPTS showed lower glass transition temperature and excellent water-resistance, which probably due to
the incorporation of the bulky branched hydrophobic group of MPTS into the copolymer chains. 相似文献
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本文选用常见的乙烯-醋酸乙烯酯共聚乳液(EVA)作为防水涂层的基料,对其表面进行疏水性设计,考察防水涂层的影响因素。将制备的 SiO2颗粒进行有机改性,在 EVA表面负载改性的 SiO2颗粒形成粗糙结构,接枝三甲氧基硅烷控制材料的润湿性能,达到对涂层表面的亲疏水性进行调控的目的。结果表明:制备的 SiO2粒径 D97为 7 μm,红外光谱分析表明 SiO2有机改性比较成功,SEM测试表明 SiO2负载在 EVA表面,通过结构和化学亲疏水性设计的 EVA膜的接触角达到了 172. 9°。防水涂层在水中浸泡 72 h后,其水接触角仍维持在 170°左右,具有很好的疏水稳定性,表现出较好的应用潜力。 相似文献
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以壬基酚、1,6-二溴己烷、氯磺酸为主要原料合成的阴离子Gemini磺酸盐表面活性剂9 B-6-9 B为乳化剂,苯乙烯(St)、丙烯酸丁酯(BA)为单体,合成了乳胶粒径小于100 nm且分布均匀的苯乙烯-丙烯酸丁酯共聚物纳米乳液,考察了聚合温度、乳化剂用量、引发剂用量、单体配比、单体含量对乳液的影响,探讨了乳胶粒子成核机理。结果表明,随着温度的升高,乳胶粒子的平均粒径减小,转化率与凝胶率增大;随着乳化剂或引发剂用量的增加,乳胶粒子的平均粒径和凝胶率减小,转化率增大;随着软单体比例的增加,乳胶粒子的平均粒径与转化率增大,粒径分布变宽,凝胶率减小;单体用量增大,乳胶粒子的平均粒径与凝胶率增大,转化率降低;乳胶粒子的粒径呈单峰分布,可能是按胶束成核机理形成的。 相似文献
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根据色粉纸表面固砂的性能要求,以丙烯酸丁酯(BA)、甲基丙烯酸异辛酯(EHMA)为软单体、丙烯酸甲酯(MA)、甲基丙烯酸甲酯(MMA)为硬单体,丙烯酸羟丙酯(HPA)为交联单体,甲基丙烯酸(MAA)、甲基丙烯酸缩水甘油酯(GMA)作为功能单体,采用半连续种子乳液聚合法,制备了具有核壳结构的水性丙烯酸酯树脂乳液(WSAE-G),进一步将其作为色粉纸表面固砂用黏合剂和成膜剂.讨论了GMA用量对乳液粒径、稳定性和黏度等的影响.利用DLS和TEM对乳液乳胶粒子的大小及形貌进行了表征,使用TG、DSC以及万能材料试验机对胶膜的性能进行了测试.对固砂产品表面进行SEM测试.结果表明:GMA用量为1%(以混合单体总质量为基准,下同)时,乳液粒径为142.4 nm,PDI为0.063,乳液分散稳定指数(TSI)为0.162287.TEM显示,乳液具有清晰的核壳结构.胶膜拉伸强度达9.057 MPa.制得的色粉纸层间结合力为244.9 J/m2,所形成的固砂层均匀、磨砂性较好且不易掉砂. 相似文献
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Hongqiang Li Yong Zhong Xuejun Lai Xiaolan Li Pingxu Chen 《Journal of Adhesion Science and Technology》2013,27(8):740-752
Hydrogenated acrylic rosin (HAR)/polyacrylate composite emulsions were prepared by seeded semibatch emulsion polymerization method. The effect of HAR amount on monomer conversion rate, coagulum rate, and gel fraction of the composite emulsions as well as the water absorption ratio, adhesion properties, and thermal durability of the HAR/polyacrylate composite latex films was studied; the composites were also characterized by Fourier transform infrared spectroscopy (FT-IR), gel permeation chromatograph (GPC), differential scanning calorimetry, and thermogravimetry. The results showed that with the increase of HAR amount, the monomer conversion rate, gel fraction, molecular weight, and water absorption ratio were all decreased, and the coagulum rate and molecular weight distribution increased. HAR had good compatibility with polyacrylate, and when HAR amount was 4 wt%, the HAR/polyacrylate composite latex film had superior adhesion properties and thermal durability. 相似文献