后缩醛改性聚醋酸乙烯乳液的研制

介绍了一种聚醋酸乙烯乳液缩醛化改性的制备方法，使其耐水，抗冻性能，粘接强度和流动状态得到明显改善，用于制备乳胶漆或其它对耐水性能有特殊要求的应用上。     

耐水性聚酯酸乙烯乳液的制备

聚醋酸乙烯乳液俗称白乳胶,由于具有价格低、粘接力好、无毒无污染、不易燃烧等特点,广泛应用于木材、装饰板、纸张加工、皮件粘合以及印染、固着剂等领域。但聚醋酸乙烯乳液耐水性差、柔韧性低,严重影响其使用性能,为此我们从工艺及原料两方面改进其制备方法,所得产品耐水性和塑性均有明显提高。     

氧化淀粉与聚醋酸乙烯乳液共混体系的粘接性能研究

提出了氧化淀粉共混改性聚醋酸乙烯乳液的机理，采用计算机辅助设计法确定了最优配方。试验结果表明，共混改性后的聚醋酸乙烯乳液具有粘接强度高、耐水性好、固化速度快等特点，可显著降低聚醋酸乙烯乳液的生产成本。     

聚醋酸乙烯乳液胶粘剂的改性

为改善聚醋酸乙烯乳液胶粘剂耐水性差、蠕变性大的缺点，用脲－三聚氰胺－甲醛树脂对其进行了改性，使其干强度和湿强度均有明显的提高，并对聚醋酸乙烯乳液胶粘剂缺陷的原因作了分析，介绍了改进和提高其性能的原理和方法。     

新型耐水性聚醋酸乙烯乳液粘合剂的研制

]本研究通过对聚醋酸乙烯乳液中保护胶体的改性、测定复合乳化剂cmc值以确定其复配比例和用量，以及在聚合单体中溶入流水性树脂等方法，制得耐水性较好的新型聚醋酸乙烯乳液粘合剂。     

聚醋酸乙烯乳液耐水性研究

在聚醋酸乙烯乳液中加入改性剂（如三聚氰胺甲醛树脂，脲醛树脂，乙二醛和环氧大豆油）以改进乳液耐水性，其中以三聚氰胺甲醛树脂最佳．文中介绍了实验方法，讨论了改性剂对乳液耐水性和粘接强度的影响。     

新型聚醋酸乙烯乳液的制备研究

为了改善聚醋酸乙烯乳液胶粘剂的耐水性、耐热性、耐寒性和乳液稳定性，蠕变性大及粘接强度低的缺点。本实验通过采用多苯基多异氰酸酯（PAPI）及羧基丁苯胶乳对聚醋酸乙烯乳液改性，配置出一种双组分改性聚醋酸乙烯乳液、该改性聚醋酸乙烯乳液在室温（25℃）下的固化时间约为1．5h。与传统的聚醋酸乙烯酯白乳胶相比较，具有抗冻性好、贮存稳定、成本低、性能好以及用途更广等优点。可用于制造高档家具。     

共聚型聚醋酸乙烯酯乳液胶粘剂的研制

利用醋酸乙烯酯与两种烯类单体共聚,研制出防冻性、耐水性较好的环保型聚醋酸乙烯乳液胶粘剂,并通过研究发现聚醋酸乙烯乳液组成(聚乙烯醇、共聚单体以及乳化剂等)均对乳液性能产生影响。     

醋酸乙烯与双环戊二烯顺丁烯二酸单酯的共聚

引言 聚醋酸乙烯乳液是热塑性树脂,它具有粘接强度高、固化速度快、胶黏范围广泛、制备简单、使用方便等优点,但其软化点较低,且合成中通常用亲水性聚乙烯醇作保护胶,因而其耐热性和耐水性都较差,降低了其使用价值.     

聚醋酸乙烯乳液聚合工艺及改性研究进展

近年来,聚醋酸乙烯乳液在涂料和胶粘剂等领域得到了广泛应用,针对其耐水性差、耐寒性不好和低温稳定性差等缺点,人们采用不同工艺进行了相关改性研究。本文简要介绍了聚醋酸乙烯乳液聚合工艺及其改性研究的最新进展。     

有机硅氧烷对光油乳液性能的影响

文章介绍了一种采用核壳共聚工艺制备经有机硅氧烷改性的苯丙型光油乳液的方法,重点讨论了聚合工艺、乳化剂、有机硅氧烷对乳液性能的影响。结果表明,采用核壳共聚工艺、合理控制反应条件;乳化剂的用量为单体总量的3.25%;有机硅氧烷A-1706适于作为交联单体,合理用量为0.6%,可以明显提高乳液的性能。     

氧化淀粉与聚醋酸乙烯酯乳液的共混改性

介绍了用氧化淀粉与聚醋酸乙烯酯乳液共混改性的方法。结果表明,共混改性乳液固含量明显提高,粘度明显增大,生产成本显著降低。     

The concentrated emulsion approach to toughened polymer composites: A review

A series of tough polymers were prepared by combining flexible with rigid chains, using the method of concentrated emulsion polymerization. The tough materials obtained can be classified into four types: [a] those prepared via the polymerization of a monomer containing a dissolved elastomer, starting from its concentrated emulsion in water; [b] those prepared via heterogeneous (interfacial) crosslinking of two partially polymerized concentrated emulsion in water containing incipient latexes; [c] those prepared as semi-interpenetrating or AB network latexes, starting from a concentrated emulsion in water and [d] those prepared by mixing two partially polymerized concentrated emulsions and completing the polymerization. A concentrated emulsion differs from the conventional emulsion in that the volume fraction of the dispersed phase is higher than that of the most compact arrangement of monosize spheres (0.74) and can be as high as 0.99. The cells of a highly concentrated emulsion are no longer spherical, but polyhedral in shape, compactly packed and separated by thin films of continuous phase. As a result of such structure, a high polymerization rate and a high molecular weight can be achieved, the size (in the colloidal range) of the flexible phase can be controlled and the latter phase can be uniformly dispersed in the rigid one. Consequently, the concentrated emulsion method constitutes a suitable pathway to toughened composites. Owing to the compact packing of cells, the concentrated emulsion polymerization method is particularly suitable for cases in which reactions occur at the cell interface. For the materials of type [d], these reactions generate quasi-block copolymers, which compatibilize (via “auto-compatibilization”) the components of blends.     

不同成膜树脂对水性膨胀型防火涂料性能的影响

采用苯丙乳液、环氧乳液、硅丙乳液以及丙烯酸乳液为成膜物制备了几种膨胀型防火涂料,通过锥形量热仪(CONE)和小室法等手段对其防火性能进行研究,并对其理化性能进行了常规测试分析。研究结果表明:硅丙乳液涂料具有较好的防火性能,但其发泡层结构不够致密。若用硅丙乳液与环氧乳液按质量比1∶1复配后,可改善其防火涂料的发泡层结构,使其防火性能大大提高。     

改性有机硅织物柔软剂的研究

采用乳液滴加法合成了酯基改性有机硅织物柔软剂,并对影响聚合的各种因素进行了讨论。结果表明,利用水溶性催化剂,含氢硅油与丙烯酸酯在８０°Ｃ条件下进行乳液聚合,可得到性能稳定的有机硅复合乳液,其对织物具有很好的柔软整理效果。     

Study on emulsion and suspension in situ polymerization

A novel and simple method of emulsion and suspension in situ polymerization was designed for preparing a composite of polystyrene containing core–shell emulsion particles. The advantage of this method was that it did not need a complex process, such as emulsion breaking, washing, drying, and so on, during transforming from emulsion polymerization to suspension polymerization. First, the core–shell particles of poly(styrene/bisphenol A dimethyl methacrylate)/polystyrene [P(St/BPADA)/PS] with crosslinking structure were synthesized by emulsion polymerization. Then the latex was broken with electrolyte dripping and the emulsion particles became swollen and transformed into the monomer in the suspension polymerization system. Thus the emulsion and suspension in situ polymerization could be carried out successfully. The mechanism of the process was investigated in detail. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 95: 404–412, 2005     

光散射法对胜利酸化压裂液破乳剂的筛选与评价

以研究酸化压裂液破乳剂为目的,通过瓶试法和光散射法相结合,结果表明：破乳剂N922对原油乳状液的破乳效果最明显,并且确定了破乳剂的最佳用量。同时通过实验验证了光散射法可通过液滴粒径变化率、澄清度、稳定性系数等微观特性对原油乳状液破乳剂进行微观分析,而且与瓶试法有很好的一致性。     

采用高压静电雾化法制备W/O乳化液的实验研究

采用静电雾化方法进行了W/O玉米油乳化液制备的实验研究,在雾化流量2.8~15 mL/min、电极施加电压5.2~11 kV的条件下,用Winner99颗粒图像测试仪测试了所制乳化液的离散相滴径,分析了施加电压及雾化流量对平均滴径及滴径分布的影响. 结果表明,静电雾化法可制备离散相滴径比搅拌法更均匀的乳化液,离散液滴平均滴径约为28 mm且绝大多数液滴直径为20~40 mm,其稳定性明显优于搅拌法所制乳化液. 乳化液离散相滴径与施加电压及雾化流量密切相关,电压增大、雾化电流增大,乳化液离散相滴径急剧减小,滴径分布变窄. 流量增大,单位时间内液滴携带及输运的电量增大,故雾化电流增大;但液滴荷积比随流量增大而减小,故滴径变大,滴径分布变宽. 高电压、低流量有助于获得稳定性更好的乳化液.     

微波化学法原油破乳脱水工艺的优化

对原油乳状液分别采用热化学法及微波热化学法进行了破乳脱水实验。对于本实验所用含水量为78%的1#原油乳状液,采用热化学方法时,破乳剂的用量为100 mg/L,加热温度为65℃,加热9 min后,可脱水约为96.2%;而采用微波化学法时,破乳剂的用量为50 mg/L,辐射时间为10 s,沉降时间为2 min,可脱水约为94.9%。提出了原油乳状液脱水的工艺为对原油乳状液采用二次脱水处理,首先采用微波化学法,再对一次脱水后的上层原油乳状液采用加热法。对1#原油乳状液,一次微波辐射脱水后,上层油的含水量在18%左右;对上层油进行加热二次脱水后,原油的含水率小于0.3%,可得到合格原油。