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Acrylate latex modified by vinyl triisopropoxy silane (C-1706) was synthesized by seeded emulsion polymerization with anionic emulsifier sodium dodecyl sulphonate(SDS) and nonionic emulsifier OP-10 as the multiple emulsifiers at (78±2) ℃. The effects of different factors, such as the emulsifier, C-1706 monomer and its feeding manner on the properties of acrylate latex modified by C-1706 were investigated. The particle size distribution and the structure, the configuration, the weather durability and stain resistance of copolymer latex were characterized by particle size analyzer, Fourier transform infrared spectroscopy (FT-IR), transmission electron microscope(TEM), scanning electron microscope(SEM) and ultraviolet aging instrument respectively. The results show that SDS to OP-10 as multiple emulsifiers can lead to coordinated efficiency, the optimal emulsifier dosage is 2.4%?3.2%(mass fraction), and the mass ratio of SDS to OP-10 is 1?1? 1?2. The seeded emulsion polymerization can effectively introduce a organic-siloxane bonding in a macromolecule inter polymer, and the obtained acrylate latex modified by organic-siloxane possesses narrow distribution of particle size with mean diameter of 51.8?76.6 nm and has the excellent properties in weather durability and stain-resistance especially. 相似文献
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聚丙烯熔融接枝马来酸酐和苯乙烯的研究 总被引:15,自引:1,他引:15
用双螺杆挤出机研究了加入助剂和不加助剂的马来酸酐(MAH))和苯乙烯(St)对聚丙烯(PP)的熔融接枝改性.采用正交试验优化了熔融接枝工艺条件.系统研究了单体MAH、St,引发剂过氧化二异丙苯(DCP)和助剂 - 一种硫代酸酯(AB)用量对MAH接枝率的影响,并对其影响因素作了分析.用FTIR表征了产物结构.分析了助剂AB抑制PP降解的机理.研究表明AB助剂不仅能降低PP降解,同时也提高了MAH的接枝率.得出较佳的工艺条件为:反应挤出温度T1 = 190℃,T2 =190℃,停留时间t = 2.5 min,转速r = 100r(min(1,较佳的原料质量配比为m(PP):m(MAH): m(St):m(DCP):m(AB)=100:8:3:0.5:0.5. 相似文献