共查询到20条相似文献,搜索用时 71 毫秒
1.
2.
考察了聚合工艺条件对乳液聚合稳定性的影响。试验表明:搅拌转速、聚合反应温度、聚合反应时间、单体滴加时间等是影响硅丙乳液聚合稳定性的主要工艺条件,并对主要因素进行了考察。 相似文献
3.
4.
5.
采用聚四氢呋喃醚二元醇(PTMG-1000)和聚碳酸酯二元醇(PCDL-1000)作为混合软段,以异佛尔酮二异氰酸酯(IPDI)、二羟甲基丙酸(DMPA)及 1,4-丁二醇(BDO)作为硬段,并通过全氟己基乙基甲基丙烯酸酯改性制备了水性含氟聚氨酯乳液(WFPUA)。研究了含氟单体用量对乳液稳定性、胶膜耐水性以及织物防水性能的影响。结果表明:随着含氟单体用量的增加, WFPUA胶膜的水接触角随之增大,当含氟单体质量分数达到 25%时,胶膜水接触角达到 119. 9°,吸水率仅为 10. 05%,处理过的织物沾水等级高达 4~5级。 相似文献
6.
7.
硅丙乳液的合成新工艺及其性能表征 总被引:4,自引:0,他引:4
由于有机硅的低表面能和硅氧烷的长链大分子结构,难以被乳化剂乳化而进入胶束,有机硅和丙烯酸单体的共聚受到很大限制,因此以丙烯酸酯、乙烯基硅油为主要原料,以OP-10和十二烷基硫酸钠(SDS)为复合乳化剂,采用连续滴加法,制备了有机硅改性丙烯酸酯乳液(硅丙乳液).论述了聚合工艺,利用红外光谱和激光粒度分析仪等方法对乳液及其涂膜的性能进行了分析与表征.结果表明,这种合成工艺简便、经济、产率高;乳液尺寸分布窄,各项性能优异;其涂层无色透明、附着力好,并有较强的耐水性(吸水性4.8%). 相似文献
8.
9.
10.
有机硅改性丙烯酸酯乳液的合成及性能研究 总被引:4,自引:0,他引:4
采用有机硅氧烷与丙烯酸酯单体共聚制备有机硅改性丙烯酸酯乳液,研究了有机硅单体用量、乳化剂配比和温度等因素对乳液的影响,并对涂膜性能进行了测试。研究结果表明,有机硅与丙烯酸酯单体能很好地聚合,且制备出的乳液性能优异,可以作为高性能外墙涂料的基体树脂。 相似文献
11.
12.
以十二烷基苯磺酸(DBSA)为乳化剂,十六醇(CA)为助乳化剂,盐酸和十二烷基苯磺酸(DBSA)为掺杂剂, 过硫酸铵为引发剂,采用乳液聚合法合成了导电聚苯胺(PAn).研究了反应温度、反应时间及苯胺、十二烷基磺酸、十六醇、盐酸和过硫酸铵配比对聚苯胺电导率的影响.研究结果表明,较佳的工艺条件为:反应温度为7 ℃,反应时间为6 h,较佳的原料物质的量的比为苯胺∶十二烷基苯磺酸∶十六醇∶盐酸∶ 过硫酸铵=0.05∶0.028∶0.04∶0.01∶0.05;以十六醇为助乳化剂,采用十二烷基苯磺酸和盐酸为掺杂剂,提高了聚苯胺的导电性.同时对聚苯胺导电机理进行了分析. 相似文献
13.
以丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙磺酸钠(SAMPS)为聚合单体,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,采用反相乳液聚合法,合成了微交联型丙烯酰胺共聚物乳液。当n(AM)∶n(SAMPS)=3∶2,MBA为单体总质量的0.08%,过硫酸铵为单体总质量的0.03%,异丙醇为单体总质量的0.3%,亚硫酸氢钠为单体总质量的0.06%时,合成产物具有优良的增稠性能和耐电解质性能。测试结果表明,质量分数1%的聚合物水溶液黏度大于1.0×105mPa.s,质量分数1.2%的聚合物水溶液在质量分数0.1%氯化镁和氯化钠存在时的黏度保持率分别为32.76%和24.66%。另外该聚合物乳液的残留丙烯酰胺(2 mg/kg,反相时间(15 s。 相似文献
14.
Ikenna H. Ezenwajiaku Connor A. Sanders Sean R. George Michael F. Cunningham 《加拿大化工杂志》2023,101(9):5222-5230
The emulsion polymerization of styrene was investigated using polystyrene-b-[polystyrene-r-poly(methacrylic acid)] amphiphilic block-random copolymers (BRCs) of different compositions as stabilizers. These stabilizers with molar masses <20,000 g/mol, which possess unique dispersion behaviour (i.e., self-assembly with low aggregation numbers) when dissolved in aqueous medium at alkaline pH, were prepared by the nitroxide-mediated bulk polymerization of styrene to achieve a desired molar mass followed by chain extension by batchwise addition of styrene and methacrylic acid monomers to obtain the stabilizing group. Emulsion polymerizations of styrene stabilized by these BRCs yielded stable latexes with particle diameters that range between 30 and 150 nm. When different concentrations of the stabilizer (2–3.5 mM) were utilized for emulsion polymerization of styrene, a similar novel emulsion polymerization mechanism observed previously by our group for the acrylic-acid based amphiphilic BRCs was also seen, further validating the difference between this class of polymeric surfactants and conventional small molecule surfactants, block copolymers, or alkali soluble resins. The performance of methacrylic-acid based BRCs was more efficient and yielded higher surface coverage of the polystyrene latexes when compared to the acrylic-acid based BRCs as a result of the more hydrophobic nature of the former. 相似文献
15.
通过反相乳液法合成了一系列两性共聚物Poly(AM-DMPS),并研究了该两性共聚物对黏土的絮凝效果,结果发现,该两性共聚物对黏土有较好的絮凝效果,同时对絮凝现象进行了机理探讨. 相似文献
16.
17.
为了提高产率,减少副反应,以环己烷为分散介质,油/水比例为1.6,Span80-Tween80为乳化剂,使用过硫酸钾作为引发剂,用新方法反相乳液合成了高分子聚合物马来酸酐-牛磺酸-丙烯酸-丙烯酰胺-烯丙基磺酸钠。通过静态阻垢实验评定表明:阻垢剂投加量达到10 mg/L时对碳酸钙和磷酸钙阻垢率较佳,分别为90.4%和91.8%;在高温、高pH、高硬度等恶劣条件下对碳酸钙仍分别有60.2%,46.4%,53.2%的较好阻垢率;投加量达到5 mg/L时对氧化铁分散性能最佳,透光率为46.1%。该共聚物是一种耐恶劣条件的优良阻垢分散剂。 相似文献
18.
采用乳液聚合法合成了丙烯酸丁酯和甲基丙烯酸共聚胶乳,用红外光谱对胶乳的结构进行了表征,讨论了加料方式、水油体积比和引发剂与胶乳性能的关系。结果表明,聚合中分3次加料可使反应更平稳地进行;控制水油体积比在1.50左右更易于反应的控制,胶乳性能也较好;引发剂质量分数为0.2%~0.4%时反应体系稳定,胶乳中的单体残留量少,共聚胶乳的性能较好。 相似文献
19.
Heterocoagulation behavior of carbon black with surface encapsulation through emulsion polymerization 下载免费PDF全文
Nanocomposite microspheres containing styrene–acrylate resin, wax, and carbon black (CB) with desired CB dispersion were prepared through heterocoagulation. The CB surface was modified using conventional anionic emulsifier and anionic dispersants with different lengths of nonionic chains and reactivities or through polymer encapsulation via emulsion polymerization to regulate the dispersion and concentration of CB in the microspheres. Experimental results showed that anionic dispersants with long nonionic chains effectively dispersed and stabilized CB particles. Polystyrene (PS) was then encapsulated on the CB surface by using a reactive dispersant and a water‐soluble initiator of polymerization. The CB particles exhibited comparable pH stability with other heterocoagulation components. Overall, encapsulation through emulsion polymerization can be used to obtain not only high CB content but also improved CB distribution in the resulting microspheres. High coagulation efficiency can also be achieved using polystyrene‐encapsulated dispersed CB because of its high affinity to emulsifiers and reactive dispersants during dispersion. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43516. 相似文献
20.