聚乙烯醇缩丁醛胶粘剂的制备

以聚乙烯醇(PVA)与正丁醛的质量比、反应体系的pH值、反应温度以及保温时间等作为制备聚乙烯醇缩丁醛(PVB)及其胶粘剂的主要因素,通过测定PVB的缩丁醛基含量、PVB胶粘剂的某些性能(如持粘力、黏度和固含量等)优选出制备PVB胶粘剂的最佳工艺条件。结果表明:当m(PVA)∶m(正丁醛)=100∶70、反应体系的pH值为2.0、反应温度为85℃、保温时间为3 h以及正丁醛的滴加速率为20~30滴/min时,PVB的缩醛度较高且形态较好,PVB胶粘剂的持粘力、黏度和固含量等指标均相对较高。     

聚乙烯醇缩丁醛-酚醛树脂-环氧树脂结构胶的研制

在氢氧化钠(NaOH)催化作用下,以苯酚和甲醛为主要原料,合成了甲阶PF(酚醛树脂),并测定了游离甲醛含量和收率;然后以PVB(聚乙烯醇缩丁醛)和甲阶PF为EP(环氧树脂)的柔韧改性剂、咪唑为固化剂,合成了三元共聚结构胶。研究结果表明:采用单因素试验法优选出制备甲阶PF的最佳工艺条件为n(F):n(P)=1.5:1、反应温度80℃和反应时间3 h;此时,甲阶PF的收率为92%,游离甲醛含量为1.4%。当m(PF):m(EP):m(PVB)=100:30:20、固化工艺为120℃/3 h时,制成的三元共聚结构胶用于铝板-铝板的粘接时,其剥离强度为15.72 N/cm、粘接强度为5.68 MPa。     

聚乙烯醇缩丁醛的制备研究

聚乙烯醇缩丁醛被广泛应用于油墨、花瓷、水松纸涂料、安全玻璃等许多领域,在国内外都有较好的应用市场。本实验通过对加料方式（加酸顺序）的探讨,发现后加酸优于先加酸。并且在m（PVA）∶m（正丁醛）=10∶7、反应体系pH值为3.0及缓慢滴加正丁醛的条件下,通过测定PVB胶粘剂的缩丁醛基含量和黏度,优选出制备PVB胶粘剂的最佳工艺条件。在以上条件都不变的情况下,使用聚合度为2099的PVA反应合成PVB的黏度和缩丁醛基的含量大大高于其他聚合度的PVA。     

改性聚乙烯醇缩丁醛片的研制和应用

采用环氧树脂对聚乙烯醇缩丁醛片进行改性。本文讨论了环氧树脂的不同品种及加入量对改性聚乙烯醇缩丁醛片的性能影响     

聚乙烯醇缩丁醛合成工艺探讨

为了改进现有聚乙烯醇缩丁醛的合成工艺,探讨了丁醛与聚乙烯醇的配比、盐酸的用量、加料方式、反应助剂等因素对缩醛反应的影响。在优选的工艺条件下,产品的缩丁醛基质量分数可达77.2%,较原工艺提高了4.6%,产品粒径均一,无粘连。     

聚乙烯醇缩甲醛胶粘剂的改性

研究缩醛化反应中温度，酸度，原料配比和反应介质对产品性能的影响。同时通过多次实验确定了反应物的最低浓度，从而对降低生产成本，简化生产工艺有一定参考价值。     

聚乙烯醇缩丁醛的生产及应用前景

介绍了聚乙烯醇缩丁醛树脂(PVB树脂)的理化性质、制备方法及其进展,并概述了其在安全玻璃夹层材料、特种涂料、黏合剂、陶瓷印花纸以及铝箔纸等方面的广泛用途。     

聚丙烯酰胺改性聚乙烯醇缩甲醛胶粘剂的研制

介绍了聚丙烯酰胺（ＰＡＡｍ）对聚乙烯醇（ＰＶＦ）胶粘剂的改性方法，研究了ＰＡＡｍ对ＰＶＦ胶粘剂的粘度、粘接强度、游离甲醛含量等性能指标的影响。研制出的ＰＶＦ／ＰＡＡｍ胶粘剂成本低，各项性能指标均达ＪＣ４３８－９１ＰＶＦ胶粘剂产品质量标准。     

微粒状聚乙烯醇缩丁醛制备新工艺

介绍用十二烷基磺酸钠作乳化剂，在常温下，以沉淀法制备微粒状ＰＶＢ。具有时间短，能耗低等特点，制得高缩醛度的粉末状ＰＶＢ。     

高缩醛度聚乙烯醇缩丁醛工艺研究

采用水-乙醇混合溶剂法以PVA、丁醛、盐酸为原料,合成了高缩醛度聚乙烯醇缩丁醛(PVB),利用单因素试验法研究了乙醇加入量、二步丁醛加入温度、丁醛加入量、盐酸加入量因素对PVB缩醛度及产量的影响,研究结果表明,最佳的合成工艺为:乙醇与水的质量比为1∶10,在二步丁醛加入温度,15℃,丁醛与PVA质量比为0.7,盐酸与PVA质量比为0.55时,得到的PVB缩醛度为83.1%。     

Original synthesis of polyvinyl butyral with a green deep eutectic solvent and a weakly polyacrylic acid from polyvinyl alcohol and the impacts of the chains structures of polyvinyl alcohol

In this work, an environmentally-friendly deep eutectic solvent (DES) was employed as a catalyst to generate polyvinyl butyral (PVB) resins from polyvinyl alcohol (PVA) with a weakly acidic polymer (polyacrylic acid [PAA]) as an emulsifier. Finally, high viscosity PVB resins with molecular weight of 110,000–200,000 g · mol⁻¹ and acetalization degree above 83% were successfully synthesized, which was found to satisfy the requirements for interlayer films between safety glass. Furthermore, it was well proved that the properties of PVB resins immensely depend on the molecular structures of the PVA. The molecular weight of the PVB, independent of alcoholic degrees of the PVA, indicated an upward trend with the increase of the molecular weight of the PVA. As for these four PVBs with high molecular weight, the T_g was sensitive to the content of hydroxyl and acetal groups rather than molecular weight, associated with the inter- or intra-molecule hydrogen bond between  OH. PVB-1799 and PVB-1797 had higher T_i and T_g than that of PVB-1788 and PVB-1795 because the former had low contents of vinyl acetate group (VAc) and alcohol hydroxyl group (VOH). The tensile strength of PVBs was all higher than 30 Mpa, and the elongation at break was about 300% due to their high molecular weights.     

聚乙烯醇缩丁醛树脂的研究与应用

综述了聚乙烯醇缩丁醛树脂的生产原理、一步法、二步法生产工艺以及溶解法、沉淀法生产工艺, 并对不同生产工艺进行了比较;介绍了聚乙烯醇缩丁醛树脂的结构与性能的关系以及其在安全玻璃、胶粘剂、陶瓷花纸等领域的应用;概述了国内外发展现状、新技术的应用状况,展望了技术、应用的发展动态。     

聚乙烯醇缩丁醛的合成新工艺

通过对聚乙烯醇缩丁醛(PVB)的合成工艺进行改进,并在不加任何乳化剂的条件下,制得了完全粉末状的PVB产品;将其用于夹层安全玻璃的制备,则雾度值为0.41%,完全符合夹层安全玻璃的使用要求;并讨论了各因素对PVB产量的影响。实验结果表明,当m(PVA)∶m(正丁醛)∶V(HCl)=100 g∶56 g∶15 mL时,PVB的产量最高,其乙烯醇缩丁醛含量可达77.7%。     

高性能双组分室温固化环氧胶的研制

以环氧E-51、增韧剂R-1000、偶联剂KH-560、聚酰胺651、酚醛胺和促进剂DMP-30为原料,制备了一种高粘接性能、双组分室温固化环氧胶。研究了DMP-30的用量对环氧胶适用期的影响;R-1000、KH-560的用量和A、B组分配比对环氧胶粘接性能的影响。结果表明,m₍聚酰胺+酚醛胺/m_DMP-30=100/12时,环氧胶的适用期为40～45min;m_E-51/m_R-1000=100/16、m_E-51/m_KH-560=100/2,m_A/m_B=3.0/1.0时,环氧胶的粘接性能最佳。     

室温固化双组分环氧树脂结构胶的研究

以环氧树脂(EP)和二乙烯三胺基甘油正丁基醚(593)固化剂为基体,以自制底胶和预处理过的石英粉为填料,制取室温固化双组分EP结构胶。研究了不同配方、粘接工艺对EP结构胶粘接性能的影响。实验结果表明,该EP结构胶在室温条件下具有优异的粘接性能,用于粘接45#钢/钢时,其室温拉伸剪切强度为27.4MPa;该EP结构胶浇铸体的拉伸强度为44.6MPa,拉伸模量为6.82GPa;一种新的自制底胶和经KH-560偶联剂处理过的石英粉填料是拉伸剪切强度显著提高的关键因素。     

Fabrication of honeycomb polyvinyl butyral film under humidity provided by super saturated salt solutions

We introduce a novel method for making breath figure arrays (BFAs) on polyvinyl butyral (PVB) films under humidity by putting the dip coated samples inside a chamber filled with supersaturated salt solutions. With the increase in humidity or retention time, multiple porous films with bigger pore sizes and wider size distributions are generally obtained, resulting from the coalescence of the following‐up water drops. The presence of nitrogen flow accelerates the evaporation of solvents and vapor, thus increases the elastic interaction among water droplets such that films with smaller pores can be obtained. Compared to PVB/ethyl acetate solution, it is easier to obtain a film with regular honeycomb pattern by using PVB/chloroform solution. Its lower boiling point makes it evaporate faster to increase temperature gradient between film surface and the atmosphere; while its higher density makes it provide stronger support to maintain the shape of water droplets. In this study, the solubility of polymer in solvents is initially proposed to explain the BFAs formation. Higher mobility of polymer chains in a good solvent increases chances of its polar groups to interact with water droplets, thus increases the possibility of regular arrangements of water droplets on the film. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

聚乙烯醇缩丁醛包膜球形活性炭对血液模拟体系的吸附

利用聚乙烯醇缩丁醛（PVB）对球形活性炭进行包覆并分析PVB溶液质量分数及其分子量，对肌酐、VB12和溶菌酶所构成的血液模拟体系吸附性能的影响。利用吸附动力学与吸附等温线对单组分及相对差异性双组分吸附过程进行分析。采用SEM、BET、压汞法孔隙率测定及FTIR对包覆活性炭形貌、结构进行表征。结果表明：包膜前后活性炭的吸附机理均为化学吸附，PVB质量分数对吸附量及吸附速率的影响最大，且随质量分数的增大而下降显著；PVB分子量则影响较小，但对增强炭表面亲水作用意义重大。双组分体系下：溶菌酶对VB12的竞争吸附作用明显，VB12的竞争吸附强度高达30%以上；肌酐与溶菌酶体系中，两者竞争吸附强度均低于8%，竞争吸附现象不明显。     

Kinetics of polyvinyl butyral (PVB) synthesis reaction catalyzed by deep eutectic solvent

In this work, the kinetics of the polyvinyl butyral (PVB) synthesis reaction catalyzed by the deep eutectic solvents (DESs) at the low-temperature stage was studied to control the particle size of PVB resin and optimize its synthesis process. The effects of stirring speed, the concentration of polyvinyl alcohol (PVA), catalyst dosage, and temperature on the synthesis reaction of PVB were investigated. The data obtained from kinetic experiments at 283.15–298.15 K were fitted with the shrinking core models, and the results showed that the model controlled by internal diffusion fitted well with the experimental data. The internal diffusion coefficient, D_A, of n-butanal in the product layer was further calculated by the obtained model parameters, and it was applied to predict the synthesis reaction of PVB at different concentrations of n-butanal. The results indicated that the shrinking core model controlled by internal diffusion is suitable to describe the kinetics of the PVB synthesis reaction. DES played a dual role in catalysis and dispersion in the synthesis of PVB, and it was a green catalyst with good potential for PVB industrial applications.