非离子型水分散性聚氨酯的制备及性能研究

主要讨论了以聚乙二醇为亲水单体,聚醚多元醇N220为多元醇制备非离子水性聚氨酯乳液。讨论了亲水单体的用量,NCO与OH比例对聚氨酯乳液及干膜性能的影响。并比较了阴离子型,阳离子型和非离子型聚氨酯乳液的性能。     

不需预保护羟基的侧链亲水非离子水性聚氨酯的制备与性能

以酒石酸与聚乙二醇单甲醚(MPEG)为原料,在不需预保护酒石酸中羟基的情况下,经过酯化反应合成了酒石酸聚乙二醇单甲醚酯(TMPEG),以其为亲水单体通过预聚体法制备了一系列非离子型水性聚氨酯(TWPU)乳液.通过1HNMR、FTIR、拉伸测试对TMPEG和TWPU进行了结构表征与性能测试.考察了亲水单体TMPEG质量分...     

高性能阳离子丙烯酸酯乳液的研制

以非离子型表面活性剂为唯一聚合乳化剂,丙烯酸-2-乙基己基酯和甲基丙烯酸甲酯为主单体,甲基丙烯酸为亲水单体,阳离子型偶氮二异丙基咪唑啉盐酸盐为聚合引发剂,后添加阳离子型表面活性剂16-29(十六烷基三甲基氯化铵),制备了高性能的阳离子丙烯酸酯共聚物乳液.考察了非离子型乳化剂用量对反应稳定性的影响,试验了阳离子引发剂用量...     

玻纤表面处理用水性聚氨酯乳液合成与性能研究

采用异佛尔酮二异氰酸酯(IPDI)、聚醚二醇A、聚酯二醇B、亲水单体聚乙二醇PEG1000和二羟甲基丙酸(DMPA)等制备了阴/非离子型水性聚氨酯(WPU).讨论了亲水单体(PEG+DMPA)用量、异氰酸酯指数(R值)、聚醚/聚酯二醇配比等对乳液及胶膜性能的影响,并比较了使用不同表面处理剂的玻纤增强尼龙复合材料的性能....     

影响苯丙乳液机械稳定性的分析

分析了苯丙乳液配方,考察了单体配比、合成工艺、乳化剂、亲水单体对苯丙乳液机械稳定性的影响,从中可知,乳化剂、亲水单体影响较大。然后根据影响因素从乳液角度出发对其进行了改进,采用核壳工艺、亲水单体的配合使用制备出了机械稳定性好的苯丙乳液。     

改性纯丙乳液的制备

介绍了改性纯丙乳液的制备方法。着重讨论了氨基丙烯酸酯单体、反应性乳化剂和阴／非离子型乳化剂的配比，以及聚合工艺对乳液性能的影响。试验结果表明，改性纯丙乳液具有突出的钙离子稳定性和低温稳定性，容易推广应用。     

一种高固含量阴非离子水性聚氨酯的制备与性能研究

在聚氨酯(PU)链段中同时引入阴离子亲水单体和侧链为非离子的双羟基亲水单体(A-100),可以合成出一种稳定的高固含量阴非离子型水性聚氨酯(WPU)。讨论了软段种类、A-100用量等对WPU乳液的固含量及WPU胶膜性能的影响。结果表明:以聚碳酸酯二元醇(PCD)为软段,并引入适量的A-100,可以明显提高WPU乳液的固含量;当w(A-100)=4.2%时,WPU胶膜的综合性能最好;与聚环氧丙烷二元醇(PE220)相比,由PCD和A-100制备而成的WPU,其固含量较高(为57%)、综合性能较好。     

木器涂料用苯丙微乳液的合成与性能

采用种子乳液聚合法合成了新的环保型木器涂料用苯丙微乳液,研究了软/硬单体组成、种子乳液用量、乳化剂的用量及阴离子非离子型乳化剂配比、功能性单体的用量与加入方式等因素对乳液和涂膜性能的影响.     

水基聚氨酯高频热合胶的研制

用N-甲基二乙醇胺作亲水单体合成了具有高频热合性的聚氨酯乳液，该乳液能够满足富康轿车门护板的生产要求。     

聚丙烯酸酯乳液类增稠剂的合成研究

采用乳液合成法制备了聚丙烯酸酯乳液类增稠剂。根据增稠剂的增稠原理,讨论了亲水单体、亲油单体和大分子功能单体的选择,以及它们之间的配比对增稠性能的影响。     

玻纤用非离子型聚氨酯乳液的制备

采用预聚体分散法制备非离子型聚氨酯乳液,通过化学法将亲水性单体接枝到预聚物骨链,解决了化学稳定性差的难题。在此基础上还研究了预聚物中异氰酸根指数R、二元醇、扩链剂、亲水性单体与聚合物膜的关系,经过配方优化得到综合性能较好的非离子型聚氨酯乳液,满足浸润剂配制、拉丝、短切纱制品的工艺要求,达到外购产品的性能。     

水溶性单体类型对BA-MMA-St微皂乳液聚合的影响

通过与水溶性单体、甲基丙烯酸（MAA）、丙烯酸（AA）、N-羟甲基丙烯酰胺（N-MA）、丙烯酰胺（AM）共聚，实现了BA-MMA-St的微皂乳液聚合。考察了水溶性单体（羧酸类单体、非离子水溶性单体）对微皂乳液聚合稳定性和化学稳定性的影响。实验结果表明：为了使水溶性单体键合在乳胶粒表面，实现乳胶粒的稳定化，其亲水性参数I／O应为3～5，水溶性单体还必须具有良好的聚合稳定性及与主单体良好的共聚性。     

Effect of water‐soluble monomers on emulsifier‐minor emulsion polymerization of butylacrylate–methacrylic acid–styrene and properties of the latices

The stability of emulsifier‐minor emulsion polymerization and the final latices depends on whether water‐soluble monomers can be bound to the particle after polymerization, which relies on the hydrophilicity of the water‐soluble monomers. Less hydrophilic monomers are apt to be buried in the latex particle, but extremely hydrophilic monomers tend to homopolymerize in the water phase. The suitable hydrophilic index I/O of water‐soluble monomers is preferably 3–5. The adhesion power and water resistance of emulsifier‐minor latex films are better than that of conventional latex film, but the impact resistance and gloss of the former are poorer. The gloss and water resistance of the emulsifier‐minor latex films are relevant to the type of water‐soluble monomers. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 99: 796–801, 2006     

Design of New Camelina Oil‐Based Hydrophilic Monomers for Novel Polymeric Materials

Triglyceride‐based monomers represent a competitive alternative to petrochemical resources in the macromolecular compounds area. In the current study, several types of hydrophilic camelina oil (CO)‐based monomers were synthesized using tunable experimental protocols that involve three different steps: first—conversion of the double bonds into epoxy rings, second—partial opening of the epoxy rings and methacrylic groups grafting and last—opening of the unreacted epoxy rings and hydrophilic units attaching. 1H‐NMR, 13C‐NMR and FTIR spectroscopy demonstrate the success of the CO functionalization with polymerizable and hydrophilic moieties—polyethylene glycol units—with different molecular weights, exhibiting self‐emulsifiable properties. Several bulk and emulsion polymerization tests were performed for the synthesized monomers and their ability to build polymer networks using different photo‐chemical procedures (using visible and UV radiations respectively) was demonstrated, without additional surfactants. FTIR spectroscopy indicates the polymerization success by the disappearance of the specific bands assigned to the double bonds from methacrylic groups and thermogravimetric analysis demonstrates that the emulsion polymerization leads to materials with an improved thermostability.     

丙烯酸/环氧树脂接枝共聚物及其水性涂料

通过丙烯酸类单体与环氧树脂接枝共聚反应,在环氧树脂中引入强亲水性基团—COOH,使树脂水性化。研究了环氧树脂分子质量、单体种类、溶剂及反应条件对接枝共聚物水分散稳定性的影响,并考查了漆膜的固化条件。所得涂膜附着力、柔韧性、耐水性很好,可用作罐头内壁涂料和防腐涂料。     

制备聚氨酯一丙烯酸酯复合乳液的物料与工艺

介绍了适合于制备聚氨酯-丙烯酸酯(PUA)复合乳液的常规物料及新近开发的物料,包括多异氰酸酯、聚多元醇、乙烯基单体、亲水性物质、中和剂、交联剂、引发剂等。介绍了种子乳液聚合法、原位乳液聚合法和溶液聚合转相法三种典型的制备PUA复合乳液的工艺及其最新进展。指出开发功能性原材料、完善原位乳液聚合法和溶液聚合转相法以及探索新的合成工艺将成为今后研制高性能PUA复合乳液的重要领域。     

醋酸乙烯酯乳液聚合数学模型(Ⅰ) 阶段Ⅰ模型

研究了较大亲水性单体醋酸乙烯酯(VAc)乳液聚合的乳胶粒生成和生长过程,提出了VAc乳液聚合阶段Ⅰ数学模型.该模型既考虑到胶束成核机理,又考虑到水相中低聚物沉淀成核机理.研究了自由基解吸与吸附在单体珠滴上的乳化剂对VAc乳液聚合阶段Ⅰ动力学的影响,并对模型预计结果与实验数据进行了比较和讨论.     

无卤阻燃硅溶胶改性水性聚氨酯的研究

以聚醚(N -210)、异佛尔酮二异氰酸酯(IPDI)为基本单体,一缩二乙二醇(EX)为扩链剂,二羟甲基丙酸( DMPA)为亲水扩链剂,制备出固含量为30％的水性聚氨酯(WPU)乳液.采用机械分散的方式将纳米硅溶胶按计量加入到WPU乳液中,得到一系列硅溶胶改性的WPU乳液.研究表明,硅溶胶在WPU中分散得比较均匀,硅溶...     

A new concentrated emulsion polymerization pathway

To ensure the stability of the concentrated emulsions that are employed as precursors for polymerization, a two-step concentrated emulsion polymerization pathway is described. In the first step, the monomer is partially polymerized by heating at 50°C until a certain conversion is reached. Subsequently, the partially polymerized monomer is used as the dispersed phase to prepare a concentrated emulsion in which water constitutes the continuous phase. The concentrated emulsion has a large volume fraction of the dispersed phase (0.74–0.99) and the appearance of a gel. Several typical monomers are employed to correlate the stability of the concentrated emulsion and the extent of partial polymerization of the dispersed phase. It was found that monomers, which cannot lead to stable concentrated emulsions, can generate them after partial polymerization. Subsequent polymerization of the concentrated emulsion leads to latex particles. Copolymers and polymer composites were also prepared by the two-step procedure. In the latter case, water was replaced with a solution of a hydrophilic monomer in water as the continuous phase. © 1992 John Wiley & Sons, Inc.     

Effect of carboxylic monomers on acid distribution in carboxylated polystyrene latices

A study was made of the effect of carboxylic monomers, such as itaconic acid, acrylic acid, and methacrylic acid, on the relative distribution of acid in the aqueous serum phase to that on the latex surface to that buried in the particle of carboxylated polystyrene latices prepared by emulsion polymerization. The relative acid distribution of the carboxylated latices was determined by the conductometric titration method of Hen. Effect of carboxylic monomer levels and latex particle size on acid distribution ratio are given. It is shown that itaconic acid, being the most hydrophilic and having the least solubility in styrene, tends to distribute itself in favor of the aqueous serum phase, while acrylic acid, which has limited solubility in styrene and being sufficiently hydrophilic, tends to prefer the particle surface predominantly. Methacrylic acid, being the most hydrophobic of the three carboxylic monomers studied and having good solubility in styrene, is shown to be concentrated inside the particle core. The observed results are compared with other similar findings in the literature and analyzed in the light of accepted mechanisms for emulsion polymerization of carboxylated styrene systems.