丙烯酸酯改性水性聚氨酯乳液的制备及性能研究

采用物理共混和核-壳聚合法制备了丙烯酸酯改性水性聚氨酯(PU/PA,PUA)乳液,并对不同改性方法制得的乳液进行了研究。通过红外(FTIR)、透射电镜(TEM)、差示扫描量热(DSC)、热重分析(TGA)、耐水性和力学性能测试等研究了丙烯酸酯改性聚氨酯乳液及涂膜的结构与性能。结果表明具有核-壳结构的PUA乳液涂膜耐水性、耐热性和固含量较水性聚氨酯(PU)有明显的提高,力学性能稍有下降;PUA综合性能优于PU/PA。     

水性聚氨酯与丙烯酸酯共聚乳液的研究

用乳液聚合的方法 ,制备出了具有核壳结构的水性聚氨酯与丙烯酸酯共聚乳液 (PUA乳液 ) ,对PUA的性能进行了初步的研究。结果表明 ,丙烯酸酯的用量对吸水率、热性能和机械性能产生重要的影响     

辐射聚合制备核壳交联型的氟改性聚氨酯/丙烯酸酯复合乳液

将三羟甲基丙烷单烯丙基醚(TMPME)作为扩链剂引入到聚氨酯分子主链中合成出水性聚氨酯乳液,之后将其与含氟的甲基丙烯酸六氟丁酯(HFBMA)物理共混形成核壳型的聚氨酯/丙烯酸酯(PUA)复合乳液,通过~(60)Co射线引发核中HFBMA的双键与壳中聚氨酯TMPME侧链上的双键发生反应,从而使作为核的含氟丙烯酸酯和作为壳的聚氨酯产生核壳间的交联。与传统的PUA核壳乳液相比,此种核壳交联的乳液在成膜时,由于聚氨酯分子链和丙烯酸酯分子链之间存在化学键的连接,增强了聚丙烯酸酯和聚氨酯分子水平上的相容性,因此PUA涂膜的硬度、力学性能和耐候性得到大幅提高。而氟的引入使得PUA涂膜具有良好的耐水解性和耐化学品性。     

HEMA封端对PUA复合乳液性能的影响

采用甲基丙烯酸-β-羟乙酯(HEMA)对聚氨酯预聚体进行封端,合成含有双键的水性聚氨酯乳液,并制备了核壳接枝的聚氨酯-丙烯酸酯(PUA)复合乳液.通过对PUA复合乳液和涂膜性能测定,讨论了HEMA用量对PUA乳液和涂膜性能的影响.结果表明,随着HEMA用量增加,PUA复合乳液的稳定性和涂膜热稳定性得到了提高.当HEMA用量为75%时,PUA综合性能优良.     

聚氨酯-丙烯酸酯核-壳乳液的制备及其包覆的RDX

以甲苯二异氰酸酯(TDI)、聚氧化丙烯二醇DL-400(Mn=340)、二羟甲基丙酸(DMPA)、1，4-丁二醇(BDO)为主要原料，制得水性聚氨酯乳液(WPU)，用FTIR表征了其结构。以WPU、水、丙烯酸丁酯为原料，分别以AIBN、(NH4)2S2O8-NaHSO3作引发剂，采用种子乳液聚合的方法制备了聚氨酯-丙烯酸酯乳液(PUA)，运用TEM表征了PUA乳液的粒子形态。结果表明：以AIBN为引发剂合成了具有核壳结构的PUA乳液．壳层为黑色的聚氨酯胶粒，核层为白色的聚丙烯酸酯胶粒；而(NH4)2S2O8-NaHSO3引发的乳液不具有核-壳结构，黑白粒子相间分布。采用加入10％明矾水溶液使核-壳乳液破乳的方法包覆RDX，并用SEM观察RDX的表面变化，证实包覆后的RDX表面有均匀的包覆层，且颗粒间流散性较好。     

水性聚氨酯-丙烯酸酯复合乳液的性能研究

用丙烯酸酯改性水性聚氨酯制备了具有核壳结构的水性聚氨酯-丙烯酸酯(WPUA)复合乳液,系统地研究了水性聚氨酯(PU)含量、nNCO/nOH(初始物质的量比)、亲水性扩链剂二羟甲基丙酸(DMPA)用量及软硬单体质量比对WPUA乳液及其膜的性能的影响.结果显示,WPUA乳液胶粒呈核壳型结构,聚丙烯酸酯(PA)与PU链段具有...     

丙烯酸酯改性水性聚氨酯乳液的合成及性能研究

采用核-壳聚合法制备了丙烯酸酯改性水性聚氨酯(PUA)乳液,通过红外、透射电镜、差示扫描量热法对乳液的形态及结构进行了表征;研究了聚合温度、引发剂种类及用量、丙烯酸酯加入量对乳液及涂膜性能的影响。结果表明:制备的为核壳型PUA复合乳液,当聚合温度在70～75℃,采用油溶性引发剂偶氮二异丁腈,用量为2.0%～2.5%时,可得到性能较佳的乳液,制得的PUA涂膜耐水性、稳定性以及力学性能有明显提高。     

聚氨酯/丙烯酸酯复合乳液

<正>近年来,许多研究者利用聚氨酯(PU)乳液和丙烯酸酯(PA)乳液共聚具有性能互补的作用,制备了聚氨酯/丙烯酸酯(PUA)复合乳液。虽然,PUA复合乳液较单一乳液性能好,但是其涂膜的硬度、耐水性和耐化学品性还难以满足高档水性木器涂料的要求。     

丙烯酸酯对水性聚氨酯胶粘剂的改性研究

用自乳化的方法制备水性聚氨酯(PU)乳液,然后用丙烯酸酯进行改性,制备出水性聚氨酯和丙烯酸酯共聚乳液(PUA),并把聚丙烯酸酯(PA)乳液与PU乳液不同比例共混。考查了共聚型和共混型PUA乳液胶膜的吸水性、热行为、黏度、T型剥离强度。结果表明,在复合薄膜应用方面,共聚型PUA乳液的性能优于共混型PUA乳液。     

环氧树脂与丙烯酸酯复合改性水性聚氨酯的合成研究

用环氧树脂E-44和甲基丙烯酸甲酯(MMA)复合改性水性聚氨酯(WPU),丙烯酸羟乙酯(HEA)与MMA发生共聚反应.制得以丙烯酸酯为核,聚氨酯为壳,HEA为核壳之间桥连的核壳交联型PUA复合乳液.这种复合乳液集中了聚氨酯的耐低温、柔软性好、附着力强,丙烯酸酯的耐水和耐候性好,环氧树脂的高模量、高强度、耐化学性好等许多优点.实验研究结果表明:随着环氧树脂E-44和MMA添加量增大,胶膜硬度、拉伸强度和耐水性逐渐提高,胶膜断裂伸长率和乳液的稳定性则随着降低.当环氧E-44含量为4%,MMA含量为20%～30%时综合性能较好.     

A perspective on resins for aqueous coatings

Aqueous binder resins are becoming increasingly diversified and encompass classical latexes, latex-like polyurethane dispersions, and various aqueous dispersion polymers. Unlike classical and urethane latexes, the dispersion polymers are synthesized in non-aqueous media, have low molecular weights and are dispersed into water by mechanical means. The preparation of classical latexes from unsaturated monomers is scientifically well understood. Modem classical latex technology provides precise particle size control and the means to impart core-shell morphology to the particles. Core-shell morphology is beneficial for improved film formation, rheology and crosslink acceptance. Polyurethane dispersions are made by extending the molecular weight of isocyanate-terminated prepolymers with aqueous diamines. Though more expensive, polyurethane dispersion binders complement classical latexes by yielding tougher and generally more solvent resistant films. The low molecular weight acrylic, alkyd, polyester and epoxy dispersion polymers have advantages in good atomization, high gloss and flow-out in film formation Current progress includes improved scientific understanding of urethane latexes and of dispersion polymers. This is paralleled by the development of novel crosslinking systems.     

鞋用水性聚氨酯胶粘剂的研究进展

介绍了水性聚氨酯鞋用胶粘剂制备方法、性能,以及用于提高水性聚氨酯耐水性、耐溶剂性和耐热性能的交联改性技术,综述了水性聚氨酯的国内外研究进展及其在制鞋领域中的应用情况。     

Preparation of epoxy resin/acrylic composite latexes by miniemulsion polymerization method

Epoxy resin/acrylic composite latexes were prepared by miniemulsion polymerization. Epoxy resins have a functional epoxy group in them and excellent characteristics, such as heat resistance and good adhesion. Acrylic latexes have weather and water resistance. Combining the epoxy resin and the acrylic latex was an attempt to actualize these advantages. The miniemulsion polymerization method was effective in obtaining the composite latex. A less than 500‐nm droplet size for the monomer preemulsion was necessary to obtain the latex in a stable manner. Dimethylaminoethylmethacrylate and methacrylic acid as the reactive functional monomer with an epoxy group were introduced to the latexes. The effect of the polymerization method of these functional groups on the properties of latexes and their films was investigated. The latex prepared by the two‐stage polymerization method had good polymerization stability, storage stability, and solvent resistance. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 81: 128–133, 2001     

Polyurethane + polyacrylate latex mixtures: Synthesis,characterization and properties

A series of polyurethane + polyacrylate latexes has been synthesized by putting different quantities of polyacrylate dispersion into an acetone solution of an anionic polyurethane prepolymer with terminal isocyanate groups. Colloid-chemical and rheological properties of these systems have been investigated. The sorption of solvent vapors by mixtures of polyurethane + polyacrylate latexes has been studied. Some thermodynamical parameters including partial Gibbs functions of the solvent, individual polymers and their mixtures, and the Gibbs function of mixing polyurethane ionomer and acrylate copolymer have been calculated. Structureproperties relationships of the polyurethane + polyacrylate latexes were studied by dynamic mechanical analysis. Effects of varying the composition on the mechanical properties have been determined.     

有机硅氧烷改性水性聚氨酯的合成

采用有机硅氧烷单体与聚醚、二羟甲基丙酸（DMPA）和甲苯二异氰酸酯（TDI）反应制备水性聚氨酯涂料。研究结果表明采用后添加有机硅氧烷单体的合成工艺，可制备贮存稳定好的水性聚氨酯乳液；凝胶渗透色谱（GPC）分析表明有机硅氧烷改性水性聚氨酯提高了聚氨酯的相对分子质量；性能测试表明有机硅氧烷改性水性聚氨酯涂料具有明显的优点：涂膜硬度高，耐沾污性、耐水性好和耐溶剂性好。     

复合软包装用水性聚氨酯油墨的制备与性能

用不同结构的聚酯二元醇或聚醚二元醇制备水性聚氨酯( WPU)油墨,分别探讨了不同二元醇结构制备的WPU油墨对基材附着牢度、聚己二酸乙二醇-丁二醇酯(PBA)体系的硬段含量对水性油墨抗返粘性、交联剂对水性油墨耐湿性、乙醇溶剂对水性油墨干燥速度的影响.结果表明,用PBA制备的WPU油墨具有较好的附着牢度;硬段质量分数40％...     

环氧树脂改性水性聚氨酯-丙烯酸酯的初步研究

合成了环氧树脂改性的水性聚氨酯 丙烯酸酯 ,研究了环氧树脂用量、加入方式对乳液稳定性的影响。环氧基团在乳液胶膜热处理时交联 ,从而改善了胶膜的力学性能及耐水性、耐溶剂性能。     

水性聚氨酯的交联改性研究

水性聚氨酯具有环保性的同时还具有优异的黏附力、良好的透湿透气及综合力学性能.大多数水性聚氨酯涂膜耐水性、耐溶剂性等较差,限制了其应用范围.分别从内交联改性和外交联改性的角度出发,较全面的介绍了当前水性聚氨酯的交联改性方法.     

聚酯型水性聚氨酯的合成和性能研究

以甲苯二异氰酸酯(TDI)、聚酯二元醇、二羟甲基丙酸等为主要原料合成了聚酯型水性聚氨酯乳液。研究了三羟甲基丙烷(TMP),二羟甲基丙酸(DMPA),异氰酸酯基与羟基物质的量比(n/n)等对水性聚氨酯耐水性能、稳定性以及力学性能等的影响。结果表明,当n/n为NCO OH NCO OH2,DMPA含量为6%,TMP加入量0.6%,水性聚氨酯性能最佳。     

酮亚胺对水性聚氨酯性能的改进

用丙酮分别和乙二胺、己二胺反应制备酮亚胺,并以其作为潜伏性扩链剂改善水性聚氨酯(PU)的性能。研究了酮亚胺以不同方式、加量对水性PU漆膜的厚度、硬度、耐水性、耐酸性、热稳定性和机械性能的影响。结果表明,采用丙酮缩乙二胺扩链的水性PU乳液的漆膜的耐水性优于用丙酮缩己二胺和用水扩链的PU乳液的漆膜,且加入过量的酮亚胺扩链效果较好,但其热稳定性并没有得到明显提高。