低VOC含量丙烯酸酯乳液聚合物合成方法研究

为了满足某些行业加工的要求,在传统合成树脂的基础上改良VOC,重新设计了适合行业加工要求的丙烯酸酯乳液聚合物,同时也考察了乳化剂、聚合工艺和脱臭工艺对残留单体的影响。结果表明,在预乳化体系中使用B组合物的乳化剂,采用氧化-还原引发体系聚合工艺,并在聚合完成后,加入叔丁基过氧化氢（TBHP）和连二亚硫酸钠（保险粉）来消除体系中残留的微量单体,完全可以得到接近净味的乳液树脂,最终符合相关的行业测试标准。     

低成本环保型建筑乳液的研制与应用

以丙烯酸酯类单体、苯乙烯以及交联单体共聚，采用核-壳聚合工艺，合成低成本环保型建筑乳液。研究了单体配比、丙烯酸用量、乳化剂和聚合工艺对聚合反应及涂膜性能的影响。     

聚二甲基二烯丙基氯化铵的单体均聚及染料废水脱色性能研究

采用系统的单因素试验方法,先后对引发剂添加方式、反应时间、单体浓度、引发剂用量、聚合反应温度、pH值、单体纯度等影响单体聚合的因素进行了较为详细的研究,获得了各参数的最佳组合条件。采用此工艺条件实验室聚合出特性粘度高达270mL／g的聚二甲基二烯丙基氯化铵,并对其进行染料脱色性能试验,活性染料脱色率高达80％以上。     

水性涂料

0306099表面防护用含疏水和亲水单体共聚物的水性组合物:wOO3一11 969[国际专利申请,英1/美国:National Stareh and Chemieal Investment HoldingCorporation(Rodrigues,Klein A.等)一2003.2.13一40页一US920 498(2001.8.1);IPC COSL57/00 该组合物含有可形成基本不带交联剂的涂膜的由共聚物与水组成的水性聚合组合物,其中共聚物含有至少l种亲水单体和至少1种疏水烯属不饱和单体:聚合组合物为溶液或分散体形态。该聚合组合物制法为,亲水单体和疏水单体在非水溶剂中聚合得到水性聚合物分散体,再添加碱或酸形成水性聚合组合物。该水…     

合成中等分子质量聚丙烯腈聚合反应的研究

以NaClO_3/NaS_2O_5为氧化—还原引发剂,进行了丙烯腈(AN)与衣康酸(ITA)等几种不同单体的的水相沉淀聚合,制得了中等分子质量的聚丙烯腈(PAN)聚合体。系统地考察了引发剂浓度及配比、聚合温度、聚合时间、单体浓度以及第三单体甲基丙烯磺酸钠(MAS)的加入等工艺条件对聚合转化率和聚合物相对分子质量的影响。     

糊树脂聚合后单体回收工艺核算

通过对聚氯乙烯普通树脂聚合后单体回收工艺的了解,在设计糊树脂聚合后单体回收工艺上做了相关改进,并对工艺和设备进行了设计核算。     

气相聚合三元乙丙橡胶

传统的合成橡胶一般采用液相聚合 (包括均聚和共聚 )的方法制造 ,即把单体溶解或分散在溶剂或水中 ,进行聚合。而烯烃类塑料可采用气相聚合方法。从 2 0世纪九十年代起 ,美国联合碳化公司将这一技术移植到以烯烃类单体为原料的三元乙丙橡胶中 ,并获得成功 ,可谓独树一帜 ,实现了橡胶和塑料合成工艺的一体化 ,开辟了弹性体生产技术的新途径。按照传统的合成方法 ,三元乙丙橡胶的合成工艺由聚合、脱气及干燥后处理等三部份组成。其中以脱气部份的环节最多 ,其中包括单体回收 ,溶剂 稀释剂回收、挤出脱水和干燥等工序。脱气阶段的流程最长 ,能…     

低含量残留单体的中高分子量PVP K60合成研究

研究了引发体系、聚合机理和聚合工艺对聚乙烯基吡咯烷酮残留单体的影响,通过条件优化和特殊工艺得到残留单体低于USP32所规定的0.01%以下的PVP K60制品。     

影响丙烯酸酯乳液聚合的因素

阐述了单体、聚合条件和聚合工艺对丙烯酸酯乳液聚合的影响。     

聚丙烯酸酯乳液型压敏胶的聚合方法研究

采用三种乳液聚合方式：间歇乳液聚合法、半连续乳液聚合法、种子乳液聚合法,根据实验结果和三种聚合工艺的特点,选出最适合的丙烯酸酯聚合方式;探讨了聚合温度、搅拌强度、软硬单体配比、功能单体、引发剂等因素对聚合反应及压敏胶性能的影响。研究结果表明：种子乳液聚合法最佳;当体系聚合温度为80℃,聚合反应6h,搅拌速率为200f／min时可得到综合性能较好的压敏胶;当软硬单体的比例大约为3：1时,压敏胶可达到最大剥离强度;引发剂的适宜用量为单体总量的0．5％。     

Mechanochemical polymerization of acetylene

Gamma alumina, γ-Al₂O₃, was fractured in an atmosphere of acetylene monomer at room temperature to test whether they would be polymerized by mechanochemistry method on the surface of the alumina. The experimental results were obtained by serveral different methods, including CP–MAS ¹³C-NMR, ESR, pressure drop measurements of the monomer, optical absorption spectroscopy, and solvancy. The results proved the mechanochemical polymerization of acetylene monomer on surfaces of the fractured alumina. Several other combinations of either silica and acetylene monomer or polymers and acetylene monomer were tested for mechanochemical polymerization. This process proceeded with less efficiency in the silica system but no mechanochemical polymerization of acetylene was found in the combinations of the polymers and acetylene monomer.     

A Mathematical Approach to the Analysis of Swollen Emulsion Polymerization of Styrene

A mathematical model for swollen emulsion polymerization of styrene was derived in this study. The experimental data were obtained using two different swelling agents: cetyl alcohol and lauryl alcohol. In the studied system, potassium persulfate and sodium dodecyl sulfate were used as initiator and emulsifier, respectively. The variation of total monomer conversion with the polymerization time obtained with different swelling agent-emulsifier combinations and data from SEM photographs of the final latexes were evaluated for estimation of the model parameters. In the mathematical model, it was assumed that the polymerization takes place according to first-order kinetics, within the forming latex particles in the presence of monomer diffusion from the monomer droplets to the forming latex particles. The kinetic rate constants and the variation of effective diffusion coefficient of monomer with the polymerization time were estimated using model expressions. Relative rate factor-Thiele modulus diagrams were derived for swollen emulsion polymerization system.     

功能单体对冷封胶性能的影响

通过预乳化与连续滴加工艺制备了冷封胶所用纯丙乳液,讨论了功能单体对乳液聚合稳定性、基材粘附力、剥离强度等的影响。结果表明,功能单体与丙烯酸酯类单体一起滴加时,聚合过程稳定,使体系粘接性能有较大提高。     

Submicron polymer powder in electrodeless radio frequency-induced plasma-initiated polymerization

Of the 30 monomers and monomer combinations investigated, 11 were polymerized into essentially all powder, 17 into predominantly a film, and two could not be polymerized in an electrodeless rf plasma-initiated gas phase polymerization. Efficient powder formation was mainly determined by the type of the monomer, the monomer partial pressure, the type of inert gas used, and the design of the polymerization chamber. The powders examined consisted of spherical particles of submicron size and were almost completely or partially soluble; and in the case of polystyrene, the powders possesses a very narrow particle-size distribution. In all cases, the soluble material was of a very low molecular weight. The best conversion to powder achieved was 18%.     

丙烯酸丁酯单体制备工艺对其乳液聚合的影响

用催化活性和选择性俱佳的强酸性阳离子交换树脂催化合成了丙烯酸丁酯，考察了丙烯酸丁酯单体制备工艺对其乳液聚合动力学的影响，发现利用水洗并补加引发剂可使其乳液聚合动力学与工业级丙烯酸丁酯乳液聚合动力学基本一致。用新工艺制得的压敏胶性能指标均符合使用要求。新工艺减少了酯化生产中的中和、精馏等工序，具有节能、环保等优点。     

可用于缓控释肥聚乙烯基吡咯烷酮（K32）的合成与表征

研究了可用于缓控释肥包膜材料的聚乙烯基吡咯烷酮（PVP K32）的合成.研究了通过水溶液自由基聚合法合成PVP K32的实验技术,研究了不同引发剂、聚合工艺等对合成PVP K32的相对分子质量及残留单体含量的影响.通过优化实验获得一种分子量分布窄、残单含量低的PVP K32的聚合工艺,并对样品进行了表征及成分分析.     

Scaleup factors of tubular emulsion polymerization reactors

This paper examines the important dimensionless numbers that control emulsion polymerization in a tubular reactor. It was found that the activation energy of polymerization was of major importance, while the role of monomer diffusion was not very significant. By selecting certain combinations of the dimensionless numbers, changes occurring during scaleup from a small tubular diameter to a larger diameter can be approximated.     

丙烯/1-丁烯聚合物合金的单体组成切换法制备：动力学及聚合器模型

采用球形负载型Ziegler-Natta催化剂和单体组成周期性切换的丙丁淤浆共聚合技术,原位制备了聚丙烯/丙丁共聚物合金。将共聚动力学的矩模型与物料衡算相结合,首次建立了单体组成切换的共聚反应器模型。依据实验所得的丙烯实时消耗速率拟合得到模型参数,并模拟计算了不同单体组成切换频率下的聚合反应活性和聚合产物的组成。结果表明,模型能很好地描述各切换频率下丙烯的聚合速率曲线、催化聚合活性,以及合金中1-丁烯的总含量、丙丁无规共聚物的含量和“嵌段”共聚物的含量等。结果还显示,共聚过程中丙烯的脉冲进料有利于提高单体向活性中心的扩散,进而提高聚合速率和聚合活性。