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。     

丁苯吡胶乳和羧基丁苯吡胶乳的技术概况

介绍了丁苯吡胶乳（VPL）和羧基丁苯吡胶乳的聚合配方、聚合工艺、聚合方法、产品性能及其RFL浸渍液的配制和在胶帘线中的应用。VPL和羧基丁苯吡胶乳是化学纤维与橡胶粘合的高性能胶粘剂。不同制品、不同工艺、不同应用场合采用不同的VPL和羧基丁苯吡胶乳聚合配方、聚合方法及RFL浸渍液配合技术。羧基丁苯吡胶乳能提高聚酯帘线的耐热粘合性，其RFL浸渍液适用于浸渍子午线轮胎聚酯帘线。     

铜版纸用羧基丁苯胶乳的合成

本文介绍丁二烯、苯乙烯、丙烯酸在酸性乳液聚合中引发剂、乳化剂、调节剂以及水相比例对羧基丁苯胶乳的合成反应速度的影响,并为铜版纸用新型胶乳提供了配方。     

地毯背涂用羧基丁苯胶乳

羧基丁苯胶乳的生产 据统计,国外地毯背涂用羧基丁苯胶乳约有50多种牌号,表1列出了其中的主要牌号。按结合苯乙烯(St)含量的高低,可分为:低(30％)、中(35—55％)、中高(60—70％)和高(75—90％)St羧基丁苯胶乳。     

造纸用新型羧基丁苯胶乳的开发与应用

介绍了新型羧基丁苯胶乳的开发与应用,乳化剂的复配及搅拌转速对胶乳生产的影响,并通过对比验证了该产品的优良性能。     

实行进口配额的化工商品

油类 原油,汽油,石脑油,煤油,柴油,喷气燃料,其它燃料油 塑料类 ABS树脂,二醋酸纤维丝束,化纤制卷烟滤嘴,聚丙烯,丙烯共聚物 橡胶类 天然橡胶、天然胶乳、丁苯胶、羧基丁苯胶、丁苯胶乳、羧基丁苯胶乳、丁二烯胶、丁基胶、卤代丁基胶、氯丁胶、氯     

国内简讯

齐鲁橡胶厂万吨级胶乳装置投料试车成功我国自行开发设计的万吨级胶乳装置,于1990年11月3日～8日在齐鲁石化公司橡胶厂投料试车,成功地生产出了造纸胶乳和地毯胶乳,并摸索出一套行之有效的操作方法和工艺条件。该装置可年产涂料印刷纸用羧基丁苯胶乳(XSBRL—46C)、地毯用羧基丁苯胶乳(XSBRL—45B)和柔性防水涂料用沥清丁苯胶乳     

SCP-1丙烯酸涂布纸乳液

胶版印刷涂布纸主要是以原纸、白色颜料和胶粘剂等加工制成,属高级胶版印刷纸类,约占世界纸总产量的15％。目前合成树脂胶粘剂应用于涂布纸生产的有聚丙烯酸酯类乳液,羧基丁苯胶乳和丁苯胶乳,但使用最多的是聚丙烯酸酯类胶乳和羧基丁苯胶乳。据报道1980年日本生产涂布纸用胶乳量接近10万吨。     

羧基丁苯胶乳生产釜挂胶的成因及清洗

综述了当前羧基丁苯胶乳聚合釜挂胶形成的主要原因及影响,介绍了常用的清洗方法及各自的利弊,并对其前景进行了展望。     

羧基丁苯吡胶乳的技术进展

介绍了羧基丁苯吡胶乳的特性,聚合和浸胶技术的进展及其与聚酯帘线的作用机理     

高固含量丁苯胶乳制备的研究进展

介绍了高固含量丁苯胶乳制备过程中存在的技术难题和该方面的理论、模型等,综述了提高丁苯胶乳固含量常用的方法,并结合现有的理论和实验基础对高固含量胶乳制备进行了展望。     

Mechanical Properties of Melt-processed Blend of Amorphous Corn Flour Composite Filler and Styrene-Butadiene Rubber

The corn flour composite fillers were prepared by blending corn flour with rubber latex, dried, and cryogenically ground into powders, which were then melt-blended with rubber polymers in an internal mixer to form composites with enhanced mechanical properties. The composites prepared with melt-blending method were compared to those prepared with a freeze-drying method. The composite fillers prepared with styrene-butadiene were compared to those made with carboxylated styrene-butadiene matrix. Dynamic effects showed that the corn flour composite fillers produced composites with good tensile strength, elongation ratio, and toughness at 500 mm/min strain rate. Tear resistance of different composites was also studied.     

不同聚合釜生产羧基丁苯胶乳的探讨

考察了１２．７ｍ＾３和１５．０ｍ＾３聚合釜在生产羧基丁苯胶中搅拌功率、搅拌级别、桨叶端速和传热能力以对聚合温度及产品质量的影响。结果表明，在传热能力强，搅拌级别适中的情况下，聚合温度容易控制，产品质量好，转化率较镐，能耗和物耗较低。     

专用丁苯胶乳对混凝土的改性

用自制的专用丁苯胶乳对混凝土进行改性,考察了聚合物与混凝土质量比(简称聚灰比)、水与混凝土质量比(简称水灰比)、消泡剂用量、养护条件和胶乳稳定性对改性混凝土性能的影响。结果表明,当聚灰比为12%、水灰比为35%、消泡剂质量分数为丁苯胶乳的3%时,且在混凝土浇铸后干养28d的条件下,改性混凝土的抗压强度、抗折强度、黏结强度及抗渗性比未改性混凝土分别提高了6%,9%,85%,50%。稳定性越好的胶乳对改性混凝土的性能提高幅度越大。     

水泥专用丁苯胶乳的工业放大试验

研究了水泥专用丁苯胶乳从2m3中试聚合釜到20m3工业规模聚合釜的放大过程。结果表明:采用单位体积功率与搅拌桨的叶端剪切速率相结合的放大准则,能够在20m3工业聚合釜重现2m3中试聚合釜的反应结果。以38→48→40r/min变搅拌转速的操作方式可以制得平均粒径为110~120nm、粒径分布指数为0·050~0·065和化学稳定性及机械稳定性优异的水泥专用丁苯胶乳。     

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．     

Investigation into the effect of carboxylic acid monomer on particle nucleation and growth in emulsifier-free emulsion copolymerization of styrene-butadiene-acrylic acid

Latexes of carboxylated styrene-butadiene rubber were prepared via batch emulsion copolymerization with different amounts of acrylic acid in the absence of emulsifier. The effect of acid monomer was investigated in the particle formation and growth. It was observed that the amount of acrylic acid strongly affected the particle formation. The number of particles and thus polymerization rate increased with increasing of the acid content. There was no significant difference in the polymerization rate per particle in all experiments. The results show that in this case particle growth process is less dependent on the acrylic acid amount in comparison with its influence on nucleation stage and then particle number. Several parameters such as polymerization rate and number of latex particle per unit volume of the aqueous phase were calculated. Attempt was made to evaluate the average number of growing chain per particle. Also average particle diameter of the above carboxylated SBR latexes was obtained through some calculations from the direct measurement of average particle diameter in the swollen state by light scattering technique for the first time.     

生产羧基丁苯胶乳聚合釜的放大规律

根据羧基丁苯胶乳合成工艺的特点，乳液均成核机理和低皂聚合原理，拟定了聚合釜的放大规律应遵循的依据。通过冷模试验和工业性试验，推荐聚合釜适宜的搅拌器为改进四叶斜桨和四叶斜桨；回归试验数据得到改进四叶斜桨搅拌功能Ｎｐ＝２．７９（ＨＬ／Ｄ）｛（ｄ／Ｄ）＾－１４（ｂ２／Ｄ）＾０．８３－」（ｄ２－ｂ１）／Ｄ「＾－１４「（ｂ２－ｂ１）／Ｄ」＾０．８３×「（３－２ｂ１）／ｄ」＾５｝聚合釜。     

Rheology of latex-modified grouts

The rheology of grouts containing latex was investigated. The two latex additives used were carboxylated styrene-butadiene and acrylic. The influences of superplasticizer, fly ash, and blast furnace slag on the rheology of latex-modified grouts were addressed. Shear stress-shear rate curves were determined for a variety of mix proportions. The time-dependent behaviour of selected grouts was also studied. It was determined that the yield stress and apparent viscosity are influenced by latex content and that the grouts are shear thinning at low water/cement ratios. Latex imparts stability and thixotropy in grouts. Partial replacement of cement with either fly ash or slag diminishes the effect of latex on rheology.     

凝聚母液pH值的变化对环保型丁苯橡胶SBR1502E性能的影响

以中国石油吉林石化公司环保型丁苯橡胶SBR1502E为研究对象,研究了凝聚母液在不同pH值下对胶性能的影响.结果表明,在不改变母液温度、胶液进料量、高分子絮凝剂加入量情况下,凝聚母液pH值的变化对胶的性能产生较大影响,当初始pH值为3.0～3.5时,环保型丁苯橡胶SBR1502E的性能全部达到优级品技术标准.