羧基丁苯胶乳的合成

简要介绍羧基丁苯胶乳发展概况及合成工艺，并探讨了影响羧基丁苯胶乳的聚合反应及羧基分布的诸因素。     

羧基丁腈胶乳/羧基丁苯胶乳并用胶乳的性能研究

研究不同并用比羧基丁腈胶乳（XNBRL）/羧基丁苯胶乳（XSBRL）并用胶膜的性能以及考察并用胶乳的相容性。结果表明：XNBRL/XSBRL的并用比为90/10时,XNBRL/XSBRL并用胶膜的t90最短,并用硫化胶膜的交联密度较大、拉伸强度最大（33.8 MPa）以及溶胀指数最小（2.10）;XNBRL/XSBRL并用胶乳的粘度略大于XNBRL;随着XSBRL用量的增大,并用胶乳的机械稳定性变差,但变化幅度不大;XNBRL硫化胶膜和XNBRL/XSBRL并用硫化胶膜均仅有1个玻璃化温度,即XNBRL与XSBRL相容性很好,且XNBRL/XSBRL并用胶乳为均相体系;XNBRL/XSBRL并用硫化胶膜的XNBRL相与XSBRL相之间发生了化学键合,产生了共交联。     

羧基丁苯胶乳的羧基分布研究

用电导滴定法和红外光谱分析法对三种羧基丁苯胶胶的羧基分布进行了研究。并且根据所得结果对胶乳的稳定性进行了分析。     

羧基丁苯胶乳工业技术的工程开发

利用羧基丁苯胶乳中试和工业试验提出的聚合釜的放大规律和试验数据，以工业化为目标，分析了聚合釜的传热和脱气釜的放大问题，比较了２０ｍ３、３０ｍ３聚合釜放大的技术成熟性和两种结构不同的脱气釜的脱气性能。选择２台２０ｍ３聚合釜与２台５０ｍ３塔式脱气釜的匹配方案，完成了１万ｔ／ａ羧基丁苯胶乳生产装置的基础设计。经工业化生产后，证明该工业技术的工程开发是成功的，产品质量达到了工业试验产品的水平．     

油气田固井专用羧基丁苯胶乳的合成

以丁二烯、苯乙烯(St)为主要单体,引入不饱和羧酸、磺酸盐等作为功能性单体,采用复合乳化体系,以乳液聚合方式合成出油气田固井专用羧基丁苯胶乳。试验结果表明:最适宜的合成条件是w(复合乳化剂)=1.5%～2.0%、m(丁二烯)∶m(St)=(45～65)∶(55～35)、w(不饱和功能单体)=2.5%～3.5%(相对于总单体而言)、w(不饱和磺酸盐功能单体)=0.20%～1.00%、w(调节剂)=0.45%、m(烃)∶m(水)=100∶(120～130)、在(75±3)℃条件下聚合且w(过硫酸盐)=0.5%～0.6%;在最佳合成条件下制取的羧基丁苯胶乳,完全满足固井施工的要求。     

用化学法脱除羧基丁苯胶乳中残余苯乙烯

通过评价试验，筛选出一种氧化还原引发剂作为脱气剂，基础研究对其组分配比、用量以及工艺条件等影响脱气的因素作了考察。经模型和中间试验证明，用该脱气剂０．５～１．５份，在脱气温度２０～５０℃下，经２．５～３．０ｈ，可使羧基丁苯胶乳中残余苯乙烯含量由（５２８～１３４００）×１０－６降至２００×１０－６以下，且不影响胶乳的性能，脱气效果亦不受脱气釜规模的影响。     

板纸专用羧基丁苯胶乳的合成

通过实验研究了新的乳化体系并引进功能单体,在乳化体系上进行彻底地改进,合成出一种性能优越的板纸专用羧基丁苯胶乳,从而达到在质量上缩小国产胶乳与国外胶乳的差距的目的。     

Multi-walled carbon nanotube reinforced self-crosslinking hydrogenated carboxylated nitrile butadiene rubber latex film with improved properties

A dielectric self-crosslinking hydrogenated carboxylated nitrile butadiene rubber (HXNBR) latex film was prepared by diimide reduction hydrogenation of XNBR latex and the doping of multi-walled carbon nanotube (MWCNT). The structures of the HXNBR and XNBR were characterised by Fourier transform infrared spectroscopy (FTIR) and ¹HNMR, confirming the successful hydrogenation of XNBR. The mechanical, thermal, and electrical properties of the prepared HXNBR latex films were studied, and the HXNBR latex film reinforced by only 3?phr MWCNTs exhibited improved mechanical, thermal, and dielectric properties.     

一种多官能团乳化剂在羧基丁苯胶乳合成中的应用

试验发现：一种阴离子型兼具非离子性的乳化剂A用于羧基丁苯胶乳聚合体系，可显著提高胶乳的质量，其质量分数即使下降到原配方乳化剂标准用量的25％，也能制备出合格的胶乳；与使用SDS的聚合体系相比，使用乳化剂A的聚合体系的聚合反应及产物质量重复性好，胶乳的钙离子稳定性显著提高。分析发现，乳化剂用量的大小会导致聚合反应机理的差异，从而影响聚合反应及产物质量；在酸性条件下，乳化剂本 身的稳定性也是造成这种差异的原因之一。应用试验结果表明：用乳化剂A代替SDS并在一定范围内改变其用量，不会影响胶乳的应用性能。     

羧基丁苯胶乳在尼龙短纤维预处理中的应用

采用间苯二酚-甲醛-羧基丁苯胶乳对尼龙短纤维进行了预处理,研究了自处理短纤维／橡胶复合材料(SFRC)的性能,并与乌龙牌预处理SFRC进行了对比。结果表明,羧基丁苯胶乳的用量为10～15份时,SFRC的界面黏合效果较好。预处理短纤维在实验范围内,随其用量的增加,SFRC的拉伸强度和扯断仲长率呈下降趋势,100％定伸应力明显升高;当其用量为5份时,SFRC的撕裂强度达到最大值。自处理SFRC的力学性能与乌龙牌预处理的相当。     

丁苯道路胶乳工业试生产

用减粘剂法釜式（卧式蒸发器）外循环加热真察觉有缩工艺生产了固体物质量分数为４５％的道路胶乳,工业试生产表明,适宜的操作条件为：温度７０～７５℃,真空度－０．０８５ＭＰａ,脱水量３８０～５００Ｌ／ｈ,胡阒浓缩过程中碱性助剂的加入,产品胶乳的ｐＨ值比原料胶乳的高出０．４～２．０,减粘剂的加入速度过快会使胶乳产生絮凝,造成设备堵挂,而且使产品色相呈灰白色,碱性助剂的加料时间以不少于１ｈ为宜,减粘剂的加入量为胶乳总固体物质量的１．３％。     

Agglomeration of polybutadiene latex by highly carboxylated functional microspheres

Polybutadiene latex (PBL) was agglomerated by highly carboxylated core-shell agglomerating agents, which contained carboxyl groups in the shell polymer [core monomers (methyl methacrylate, n-butyl acrylate, and ethyl acrylate)/shell monomer (acrylic acid)]. The effects of different parameters upon the particle size of agglomerated PBL were investigated, namely, agglomeration time, amount of agglomerating agent, pH of dispersion medium, amount of acrylic acid and combination of core monomers. The particle growth mechanism was also examined. © 1999 Society of Chemical Industry     

改性水泥专用丁苯胶乳的稳定性研究

以十二烷基苯磺酸钠为乳化剂,用过硫酸钾引发体系,制备了改性水泥专用丁苯胶乳,考察了乳化剂浓度、进料方式和搅拌形式对胶乳稳定性的影响.     

Hydrogenation of styrene-butadiene rubber (SBR) latexes

The mechanism and the optimum conditions for the reduction of residual double bonds in styrene-butadiene rubber (SBR) latex by hydrogenating the polybutadiene in the latex form were studied. The hydrogenation involves a copper ion (II)-catalyzed procedure in which diimide hydrogenation agent is generated in situ at the surfaces of latex particles by a hydrazine/hydrogen peroxide redox system. The surface density of the copper ion in particle surfaces was found to be a crucially important parameter in controlling the degree of hydrogenation. The distribution of the double bonds in the latex particles after the hydrogenation was found to be dependent on the particle size and the extent of crosslinking in the particles. © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 64: 2047–2056, 1997     

SBR latex modified mortar rheology and mechanical behaviour

The paper deals with the influence of water-to-cement ratio (W/C) and percentage of polymer in the setting time, rheology and physical and mechanical properties of a Styrene-Butadiene-Rubber (SBR) Latex Modified Mortar (LMM).An experimental test program including setting time and consistency in the fresh state and porosity, density, ultrasonic modulus and compressive and flexural strength in the hardened state of a LMM at different ages was performed. Several W/C and percentages of latex were studied.The results obtained showed that both parameters interact in the properties in the fresh and the hardened states of the LMM. Multiple linear correlations among dosage parameters and physical and mechanical variables are presented. Linear approximations are acceptable (95% confidence level), taking into account the nature of the LMM.Some dynamic compression tests were accomplished in order to determine some dynamic properties of SBR Latex Modified Mortar, as dynamic modulus (E₀) and loss tangent (tan δ).     

丙烯酸接枝丁苯胶乳的合成和性能研究

在空气和室温条件下采用氧化-还原引发体系合成丙烯酸接枝丁苯胶乳，对影响丙烯酸接枝率R的因素。接枝胶乳结构及聚已内酰胺（PA-6）/丙烯酸接枝丁苯橡胶（SBR-g-AA)共混物性能进行了探讨，试验得出，各因素对R影响的大小顺序为：引发剂（叔丁基过氧化氢和四亚乙基五胺）质量分数，丙烯酸质量分数，反应时间，接枝后丁苯胶乳粒径稍有增大且分布变宽；SBR-g-AA可改善PA-6的冲击强度和拉伸强度。     

聚合条件对丁苯胶乳粒径的影响

通过乳液聚合方法合成了适用于聚氯乙烯(PVC)改性甲基丙烯酸甲酯-丁二烯-苯乙烯共聚物(MBS)的种子胶乳,利用一步法工艺获得一定粒径的丁苯胶乳,研究了乳化剂加入量、加入方式,聚合温度,聚合反应时间对粒径的影响,合成了粒径在200～300nm的丁苯胶乳。