影响VAE乳液黏度的因素分析

分析了生产过程中影响醋酸乙烯乙烯共聚乳液(VAE)黏度的因素，讨论了固含量、保护胶体、初始引发剂对VAE乳液黏度的影响，找出了其中规律，可指导设计开发VAE系列新品。     

影响VAE乳液粘度的因素

分析生产过程中影响VAE乳液（醋酸乙烯－乙烯共聚乳液）粘度的因素,讨论了固含量、保护胶体、初始引发剂加料总量对VAE乳液粘度的影响,找出了其中规律,指导设计开发VAE系列新品。     

水性纸塑复合胶的研制

本文讨论乙烯一醋酸乙烯乳液，添加增粘树脂、制作过程及产品的透明度，剥离强度性能。     

生物基醋酸乙烯-乙烯共聚乳液的开发与性能优势

阐述了广西皖维生物质科技有限公司利用生物质醋酸乙烯及生物质乙烯制成生物基醋酸乙烯-乙烯共聚乳液的工艺路线,探讨了生物基醋酸乙烯-乙烯共聚乳液的性能优势,对产品升级、高质量发展及满足高端市场需求具有参考价值。     

高固含量水基白乳胶的研制

以醋酸乙烯及丙烯酸丁酯为混合单体来制备高固含量水基白乳胶。采用种子乳液聚合法，制备高固含量、中等粘度、稳定性好的聚合物乳液。并探讨了单体配比、第二种子添加量、补加的乳化剂量对制备高固含量、稳定性好的乳液的影响。     

高粘度醋酸乙烯-乙烯共聚乳液的研制

介绍了一种粘度在 3 3 0 0～ 45 0 0mPa·s之间的醋酸乙烯 -乙烯 (VAE)共聚乳液的工艺制备方法。讨论了乳化剂、聚乙烯醇、醋酸乙烯、乙烯、引发剂等对乳液性能的影响。本产品具有粘度高、粘接性强、柔韧性好、耐水性强等特点。     

VAE乳液改性产品问世

VAE乳液(醋酸乙烯-乙烯共聚物)因乙烯共聚单体而有永久的增塑性能，柔软性好，成膜温度和玻璃化温度较低，对多种被粘物都有很好的粘接性能，应用越来越普遍。然而VAE乳液的粘接性和耐水性还有些不足，鉴此，中山市美敦化学聚合物有限公司引入了丙烯酸酯和叔碳酸乙烯酯等功能性单体，对VAE乳液进行改性，开发出VAE．A乳液(醋酸乙烯-乙烯-丙烯酸酯共聚物)系列产品，     

瓦克公司推出醋酸乙烯类聚合乳液新品

全球领先的醋酸乙烯类聚合乳液生产商德国瓦克公司在2008年12月初结束的第11届中国国际胶粘剂及密封剂展会上，展示了最新开发的VINNAPAS品牌醋酸乙烯-乙烯共聚乳液和VINAC DPN15醋酸乙烯均聚乳液。     

新型水泥防水用醋酸乙烯-乙烯乳液的开发

介绍新型防水用醋酸乙烯-乙烯乳液（VAE）的基本配方及生产工艺，讨论提高新产品乙烯含量、伸长率、耐水性、化学相容性、冻融稳定性的技术措施，使用新型保护胶体，提高引发剂浓度，延长连续单体加料时间，可生产出实际乙烯；降低保护胶体与VAE聚合物的接枝率，适当减小VAE分子量，可使新型VAE获得较高的断裂伸长率；增加新型VAE乳液粒子的柔软性，减小粒径，加宽粒度分布以及减少保护胶体的用量可提高产品耐水性。新型VAE乳液用于聚合物水泥防水涂料，可获得更好的应用性能。     

乙烯法合成醋酸乙烯反应尾气的回收技术探讨

通过设置乙烯回收塔,对醋酸乙烯合成反应尾气进行综合回收和利用,提高了原材料的利用率,降低了原材料和能源的消耗,且极大地减少尾气排放对环境的污染。对中压法聚醋酸乙烯-乙烯共聚乳液生产中排放的乙烯尾气进行回收处理,可降低循环乙烯中杂质的含量,提高系统乙烯纯度。     

膨化糯米粉用作乳液聚合保护胶体的研究

用膨化糯米粉替代聚乙烯醇（PVA）作醋酸乙烯酯乳液聚合的保护胶体,合成出了高固含量、低粘度且无异昧的新型“白乳胶”。与传统的“白乳胶”合成工艺及方法相比,更简单、易于操作,整个聚合过程平稳、无明显的放热高峰,藕少有凝胶产生。     

Radiation-induced emulsion polymerization of vinyl acetate and styrene

Studies have been made of the γ-induced emulsion polymerization of styrene and comparisons made with chemically initiated emulsion polymerization. The polymerization proceeded smoothly to high conversions at 0 and 60°C, the reaction showing a high G (monomer) value. Complete conversions were obtained with total doses of less than 0.05 Mrad. In accordance with the behavior expected of systems having a constant rate of initiation, the molecular weight was found to decrease with decreasing temperature. The molecular weight and particle size distributions were narrower than those obtained in chemically initiated emulsion polymerizations at the same temperature. The radiation-induced emulsion polymerization of vinyl acetate proceeded smoothly at temperatures in the range 0–50°C to give polymers of much higher molecular weight than these obtained from chemically initiated polymerizations at the same temperature. Complete conversion was attained after a dose of 0.02 Mrad for latices approaching 50% solids. The elimination of ionic endgroups in the poly(vinyl acetate) radicals tends to drive the polymerization from the aqueous phase, resulting in faster rates and higher molecular weights than are obtained from chemically initiated systems. Rates of polymerization were found to be independent of temperature and the molecular weight of the polymer to be independent of dose rate. Latices of poly(vinyl acetate) of high solids content were evaluated for latex and film properties and found to have improvements over commercially available samples in both areas, especially in clarity of film and scrub resistance. A number of acrylate and maleate esters were copolymerized with vinyl acetate in a radiation-initiated emulsion system. High molecular weight copolymers were produced after low dose.     

DEVELOPMENT OF BATCH EMULSION POLYMERIZATION PROCESSES

Although emulsion polymerization has been used for a long time, relatively little attention has been paid to the technological issues of this polymerization technique. This paper describes the research on chemical engineering aspects of emulsion polymerization in (semi-)batchwise operated stirred tanks. The objective of this work was to improve the operation of current processes and to allow for improvements in the development of novel emulsion polymerization processes. For this purpose, different issues have shown to be important, for which the work described in this paper has been focused on four topics: emulsification, colloidal stability, rheology in high solids polymerization and heat transfer. These topics have been studied using the polymerization of styrene and vinyl acetate as two representative model systems

Our results reveal that sufficient emulsification is essential for proper control of the polymerization process. For the emulsifier used in this study, the colloidal stability of the polymer particles is mainly governed by the physico-chemical properties of the reaction mixture. During high solids emulsion polymerization, the particle size distribution of the polymer particles considerably influences the Theological properties of the reaction mixture and thereby the flow pattern in the reactor. Heat transfer to the reactor wall depends strongly on reactor geometry, impeller type and diameter as well as stirrer speed. Additionally, the physical properties of the reaction mixture, being related to solids content, conversion and monomer type, are important for heat transfer.     

DEVELOPMENT OF BATCH EMULSION POLYMERIZATION PROCESSES

Although emulsion polymerization has been used for a long time, relatively little attention has been paid to the technological issues of this polymerization technique. This paper describes the research on chemical engineering aspects of emulsion polymerization in (semi-)batchwise operated stirred tanks. The objective of this work was to improve the operation of current processes and to allow for improvements in the development of novel emulsion polymerization processes. For this purpose, different issues have shown to be important, for which the work described in this paper has been focused on four topics: emulsification, colloidal stability, rheology in high solids polymerization and heat transfer. These topics have been studied using the polymerization of styrene and vinyl acetate as two representative model systems

Our results reveal that sufficient emulsification is essential for proper control of the polymerization process. For the emulsifier used in this study, the colloidal stability of the polymer particles is mainly governed by the physico-chemical properties of the reaction mixture. During high solids emulsion polymerization, the particle size distribution of the polymer particles considerably influences the Theological properties of the reaction mixture and thereby the flow pattern in the reactor. Heat transfer to the reactor wall depends strongly on reactor geometry, impeller type and diameter as well as stirrer speed. Additionally, the physical properties of the reaction mixture, being related to solids content, conversion and monomer type, are important for heat transfer.     

以聚乙烯醇为保护胶体的乳液与部分官能团的接枝反应研究

主要研究了在以聚乙烯醇为保护胶体的醋酸乙烯乳液聚合中,乳液与环氧丙烯酸酯、聚氨酯、硅烷等官能团的接枝反应.在以过硫酸铵为引发剂、以聚乙烯醇为保护胶体的醋酸乙烯乳液聚合中,乳液与上述各类官能团间发生的接枝反应直接影响乳液的黏度、固体含量、剪切强度等宏观性质.研究发现官能单体脂肪醇聚氧乙烯醚、丙烯酸异辛酯(2-EHA)等单体和丙烯酸(AA)与乙烯基三乙氧基硅烷共同作用时对乳液的宏观性质影响显著.     

三元共聚醋丙乳液的研制

制备有机硅-丙烯酸丁酯-醋酸乙烯酯三元共聚乳液。研究了有机硅、丙烯酸丁酯、醋酸乙烯酯、乳化剂含量、乳化剂配比、引发剂含量、保护胶体对乳液聚合和性能的影响,并确定了它们的最适宜条件。结果表明该共聚乳液具有良好的耐水、耐侯、耐酸碱、耐污染和稳定性能。该三元共聚醋丙乳液能良好应用于制备普及型内墙建筑涂料。     

乙烯基三乙氧基硅烷/丙烯酸酯共聚乳液的研究

以聚丙烯酸丁酯为种子乳液，将乙烯基三乙氧基硅烷（VTES）与丙烯酸酯进行乳液共聚，制成了聚合稳定性良好，性能稳定的有机硅／丙烯酸酯共聚乳液，详细讨论了VTES用量对聚合过程稳定性和乳液粒径大小及分布的影响，采用动态光散射法跟踪了聚合过程的粒径大小及分布，采用TEM表征了粒子形态；同时研究了乳液的粘度及乳胶膜的耐水性能，结果表明：乳胶粒的平均粒径随聚合时间的延长逐渐增大，乳胶粒呈球形，具有核壳结构，随着VTES用量的增加，乳液聚合的稳定性变差，乳胶粒的平均粒均增大，乳液的粘度增加，乳胶膜的吸水率减小。     

用于JS防水涂料的醋丙乳液的合成

通过对一种醋丙型防水乳液共聚配方的研究,在乳液反应过程中添加AP-02保护胶和交联单体N-羟甲基丙烯酰胺、A171有机硅氧烷、丙烯酸-2-羟丙酯对醋丙乳液进行改性,提高了乳液的耐水性能、粘结强度和抗拉强度;调胶时,加入分散剂DA-02,保证水泥粉在乳液中更好地的分散。并综合各方面因素对乳液性能的影响,得出了最优配方,即w(AP-02)=1.2%(乳液总量)、w(A-171)=0.7%(单体总量)、w(NMAM)=2.0%(单体总量)、w(DA-02)=2.0%(乳液总量)时,得到醋丙型乳液可以满足聚合物水泥防水涂料的要求。     

环氧改性乙丙乳液及其乳胶漆的制备

采用特殊的乳化工艺使环氧树脂与醋酸乙烯、丙烯酸单体混溶进行共聚改性，所得的环氧改性乙丙乳液克服了乙丙乳液的缺点。介绍了环氧改性乙丙乳液及其内墙乳胶漆的配方、生产工艺以及性能指标。     

快干卷烟胶用VAc/AA/MMA三元共聚乳液的制备

以醋酸乙烯酯(VAc)、丙烯酸(AA)和甲基丙烯酸甲酯(MMA)等为原料合成了一种快干卷烟胶用三元共聚乳液。以单体配比、聚合温度和保温时间等为主要因素,乳液固含量为考核指标,采用L9(34)正交实验法优选合成三元共聚乳液的最佳工艺条件。实验结果表明,当n(VAc)∶n(MMA)∶n(AA)=4.5∶1.4∶0.1、聚合温度为70℃以及无回流后在92℃左右的保温时间为30min时,所制取的三元共聚乳液的综合性能较好,其固含量为38.42%,黏度为1120mPa·s,并且完全满足快干卷烟胶的使用要求。