印刷用苯丙乳液研究进展

就印刷用苯丙乳液的研究现状及其性能要求做了详细论述,重点介绍了对印刷用苯丙乳液光泽、黏度等性能的影响因素。简要地对印刷用苯丙乳液的未来方向做了展望。     

表面保护胶带用聚丙烯酸酯乳液压敏胶的研究

用半连续预乳化种子乳液聚合法合成了保护膜用乳液压敏胶,主要研究了底相种子乳液中乳化剂的用量、多官能度氮丙啶类交联剂的用量对乳液压敏胶性能的影响。研究结果表明:随着种子乳液中乳化剂用量的增加,乳胶粒的粒径减小,乳液粘度、表面张力和接触角增加;增加交联剂的用量可显著提高乳液压敏胶的耐老化性能;同温度相比,湿度对乳液压敏胶的耐老化性能影响更加显著;被保护材料表面的极性和光洁度对压敏胶的耐老化性能亦有显著影响。     

水乳型压敏胶带隔离剂的研制

本文用酯交换法合成了几种酯链长度不同的丙烯酸酯。通过乳液聚合法合成了一系列丙烯酸酯均聚乳液。并分别用醋酸乙烯酯、苯乙烯同丙烯酸酯进行共聚,制得了一系列丙烯酸酯共聚乳液,测定了乳液的转化率和隔离性能,发现随丙烯酸酯链长度的增加,其转化率降低,隔离性能增加,均聚乳液的隔离性能低于共聚乳液的隔离性能,醋酸乙烯-丙烯酸酯共聚物的隔离性能低于苯乙烯-丙烯酸酯共聚物的隔离性能,并试验了外加助剂对乳液隔离性能的影响,发现在乳液中加入A-20乳化剂和聚乙二醇时,隔离性能增强。     

反应型乳化剂在丙烯酸酯无皂乳液聚合中的应用

采用半连续种子乳液聚合法,反应型乳化剂烯丙氧基羟丙磺酸钠(HAPS)、烯丙氧基壬基酚聚氧乙烯醚硫酸铵(DNS-86)、烯丙氧基壬基酚聚氧乙烯醚(ANPEO10)、烯丙氧基壬基酚聚氧乙烯醚单磷酸(ANPEO10-P1)单独及复配使用,以丙烯酸丁酯(BA)、苯乙烯(St)、甲基丙烯酸甲酯(MMA)为单体合成了丙烯酸酯无皂乳液。研究了反应型乳化剂种类和用量对乳液性能的影响,用傅里叶变换红外光谱(FT-IR)表征了乳液的化学结构。用合成的丙烯酸酯无皂乳液与市售的丙烯酸乳液分别制备了膨胀型水性防火涂料并通过耐水性试验和锥形量热仪试验对比了其耐水性和防火性能。结果表明,单独使用DNS-86时乳液的各项性能(如化学稳定性、热稳定性、贮存稳定性等)最好。DNS-86的含量为2.5%~3.0%时,乳液综合性能良好:固含量及单体转化率最大,乳胶粒子平均粒径和分散指数最小,且其聚合物膜与水的接触角最小。用自制丙烯酸酯无皂乳液制备的膨胀型水性防火涂料的性能明显优于用市售丙烯酸乳液制备的膨胀型水性防火涂料。     

乳液压敏胶制备与涂布工艺性能影响研究

分析了丙烯酸乳液压敏胶配方构成及涂布工艺的特点，探讨了在聚乙烯薄膜上连续涂布时，乳液压敏胶的机械稳定性、旋转黏度、润湿性能等对涂布稳定性的影响。结果表明：乳液连续涂布后机械稳定性下降，以及在旋转黏度上导致的润湿性能不足、乳液转移率偏低，是影响涂布稳定性的主要因素。通过引入润湿剂SW-70及改用60°蜂巢型U底网纹辊，可有效提升乳液压敏胶的机械稳定性和乳液润湿性能，增强乳液涂布稳定性，同时可进一步提升乳液压敏胶的应用性能。     

PA乳液对VAE乳液的共混改性研究

用系列聚丙烯酸酯 (PA)乳液对VAE乳液进行共混改性 ,研究了共混乳液的稳定性、乳胶膜性能、相容性等。结果表明 ,获得稳定的共混乳液的最佳条件是将VAE乳液本身的PH值调至 7;共混乳液胶膜的性能依赖于共混乳液的组成和PA配方的玻璃化温度 (Tg)及其聚合工艺 ;共混体系具有部分相容性     

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。     

环境友好型氟碳防锈乳液的制备研究

以丙烯酸丁酯、丙烯酸六氟丁酯、甲基丙烯酸十二氟庚酯、甲基丙烯酸为单体,可聚合含磷单体为功能单体合成了一种水性防锈氟碳乳液。乳液及其涂膜具有较好的综合性能,用该乳液配制的水性防锈涂料与普通苯丙乳液相比具有更优异的防锈性能。     

SAV种子乳液聚合

以苯丙乳液的微粒作为种子,用丙烯酸丁酯-醋酸乙烯酯作为壳聚合单体。苯乙烯、丙烯酸酯和醋酸乙烯酯三种单体以核壳结构的形式聚合,制备出综台性能明显优于苯丙乳液、乙丙乳液及其混合物的SAV乳液。讨论了SAV核壳结构乳液的合成工艺和性能的关系。研究结果表明,乳化剂用量、乳化剂添加方式和种子用量均是影响乳液性能的重要因素。     

可再分散乳胶粉的制备与性能表征

研究间歇法、平衡溶胀法和半连续法不同工艺制备乳液，并对不同工艺制备的乳液测试其性能．详细分析了乳液胶粒粒径的分布，不同胶粒粒径对乳液性能差异的影响。对制得的产品的性能进行了表征，用喷雾干燥法可以制得性能良好的可再分散乳胶粉。     

Statistical studies of branched ester latex and paint properties

Vinyl versatate, butyl acrylate and 2-ethylhexyl acrylate were compared as comonomer, for colloid-stabilized vinyl acetate latex polymers to assess their impact on latex coating properties. Vinyl versatate afforded advantages in scrub resistance, gloss, hydrophobicity and higher glass transition temperatures. Butyl acrylate developed better wet adhesion efficiency, gel content and hiding efficiency. 2-Ethylhexyl acrylate offered performance comparable to butyl acrylate in hiding efficiency, lowering copolymer glass transition temperatures, and gloss development. Combinations of these monomers, in many instances, afforded a better balance of performance properties than individual monomers alone. In the subject study, a simplex-centroid design was utilized to statistically map polymer compositions for determining the effect of comonomer composition on latex and paint film properties. In addition to developing contour maps of polymer and paint properties as a function of composition, a technique for studying structure-property relationships is presented.     

Complexation of poly(dimethylsiloxane)/poly(methyl methacrylate‐co‐butyl acrylate‐co‐methacrylic acid) latex with poly(dimethylsiloxane)/poly(vinyl acetate‐co‐butyl acrylate) latex

Two latices—the poly(dimethylsiloxane) (PDMS)/poly(methyl methacrylate‐co‐butyl acrylate‐co‐methacrylic acid) system (PA latex) and the PDMS/poly(vinyl acetate‐co‐butyl acrylate) system (PB latex)—were prepared by seeded emulsion polymerization, and PA/PB complex latices were obtained through the interparticle complexation of the PA latex with the PB latex. In addition, for the further study of the interparticle complexation of the PA latex with the PB latex, copolymer latices [PDMS/methyl methacrylate‐co‐butyl acrylate‐co‐vinyl acetate‐co‐methacrylic acid) (PC)] were prepared according to the monomer recipe of the complex latices and the polymerization process of the component latices. The properties of the obtained polymer latices and complex latices were investigated with surface‐tension, contact‐angle, and viscosity measurements. The mechanical properties of the coatings obtained from the latices were investigated with tensile‐strength measurements. The results showed that, in comparison with the two component latices (PA latex and PB latex) and the corresponding copolymer latices (PC latices), the PA/PB complex latices had lower surface tension, lower viscosities, and better wettability to different substrates. The tensile strengths of the coatings obtained from the complex latices were higher than the tensile strengths of the coatings from the two component latices and copolymer latices. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 92: 2522–2527, 2004     

Surface structure and properties of water‐based polymer coating materials prepared by the complexation of two polymer latices with chemically complementary structures

In this study, water‐based polymer coating materials used for the surface coating of substrates with lower surface energies were prepared by the complexation of two‐component polymer latices containing polydimethylsiloxane (PDMS) and having chemically complementary structures. The film‐forming performance of the polymer latices and the surface structures and properties of the coatings formed by the polymer latices were studied by means of scanning electron microscopy and by the measurement of mechanical strength, thermal performance, water absorbability, and contact angle. When the two‐component polymer latices [the poly(methyl methacrylate‐co‐butyl acrylate‐co‐methyl acrylic acid)/polydimethylsiloxane system (PA latex) and the poly(methyl methacrylate‐co‐butyl acrylate‐co‐pyrrolidone)/polydimethylsiloxane system (PB latex)] were compared, the complex polymer latex formed by the complexation of the PA latex with the PB latex had the best film‐forming performance, with formed coatings that were more smooth and had fewer less cracks. Also, compared to the two coatings formed by the two‐component polymer latices, the coatings formed by the complex polymer latex had a unique structure, a higher mechanical strength and elongation, a higher decomposing temperature, and better water resistance. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 90: 1748–1754, 2003     

核壳型丙烯酸酯乳胶的合成

采用丙烯酸下酯、丙烯酸乙酯和甲基丙烯酸甲酯作为主单体，甲基丙烯酸为功能单体，通过对单体配比和乳化剂用量的选择，得到了一种粘度适当、稳定性良好的乳胶，并进一步考察了涂层的附着力、硬度和抗水性。结果表明，该胶可以满足多种类型乳胶涂料的要求。     

水性聚氨酯——丙烯酸酯涂料的研究进展

介绍了聚氨酯-聚丙烯酸酯(PUA)复合乳液制备方法的研究进展,同时对PUA涂料的发展进行了展望.     

Electrochemical impedance spectroscopy study of waterborne coatings film formation

In order to establish electrochemical impedance spectroscopy (EIS) as a viable quantitative method for characterization of latex film formation, three waterborne acrylate and styrene–acrylate polymer dispersions were periodically analyzed during a course of 2 weeks. Impedance spectra were fitted on the base of equivalent circuit consisting of a capacitor in parallel with a Warburg element representing film capacitance and the extent of ion diffusion through the film. Calculated EIS parameter values showed a decrease in Warburg diffusion over time, which is a result of particle coalescence and in agreement with the established theory of latex film formation. Atomic force microscopy (AFM) of the samples showed a smoothing of the surface and blurring of interparticle boundaries which confirmed that EIS can be used to study film formation of latex.     

功能性丙烯酸酯乳液的制备与应用研究进展

介绍了核-壳乳液聚合、乳液互穿聚合物网络、无皂乳液聚合、微乳液与细乳液聚合等方法与技术在制备功能性丙烯酸酯乳液中的应用。阐述了有机硅、有机氟、聚氨酯、环氧树脂等改性方法用于制备功能性丙烯酸乳液的研究进展。详细介绍了功能性丙烯酸乳液在功能涂料、胶黏剂、皮革涂饰剂、油墨等领域的应用现状,提出了功能性丙烯酸酯乳液的发展趋势：采用新的聚合技术、改性技术制备具有附加值高、性能优异且环境友好的水性功能性乳液是今后丙烯酸酯乳液的主要发展方向。     

含硅羟基丙烯酸酯乳液的合成

采用单体预乳化方法结合半连续种子乳液聚合工艺,制得了耐水性好和附着力高的舍硅羟基丙烯酸酯乳液.考察了乳化剂用量、引发剂用量、羟基单体用量、有机硅单体用量与引入方式对乳液聚合稳定性的影响.结果表明:当w(乳化剂B)为0.90%、w(引发剂)为0.45%、w(HEA)为10%、w(A-151)为5%时,合成的含硅羟基丙烯酸...     

高羟基含氟丙烯酸乳液的合成及性能研究

以丙烯酸酯类单体作为原料,以过硫酸钾为引发剂,采用预乳化半连续乳液聚合方式合成了高羟基丙烯酸乳液,并在后期补加氧化还原体系引发剂,提高了单体的转化速率。系统地研究了乳化剂用量、羟基单体、氟单体、硅单体含量等因素对涂膜性能的影响。最后,将制备的丙烯酸羟基组分同水性固化剂配制成双组分水性丙烯酸聚氨酯清漆,并分析清漆的性能。     

Latex film performance of styrene–acrylic particles functionalized with acrylic acid

Latex polymers are frequently used as substitutes for solvent‐borne coatings in environmental friendly technologies. However, the relationship between the copolymer composition and the latex film performance must be established. The preparation of a series of styrene–n‐butyl acrylate latexes functionalized with different amounts of acrylic acid through semicontinuous emulsion polymerization is presented. In this work, latexes were employed to study the modification of the latex film properties by the addition of acrylic acid during the polymerization; mainly, the adhesion to the substrate, the water vapor permeability, and the electrical film resistance were examined. The most advantageous acrylic acid content was established by a balance of the tested properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009