聚乙烯醇缩丁醛树脂溶解法生产工艺初探

为提高聚乙烯醇缩丁醛(PVB)树脂缩丁醛基含量,采用溶解法生产聚乙烯醇缩丁醛树脂的生产工艺,通过对缩合发应中PVAc、正丁醛、盐酸的配比进行研究,制备出缩丁醛基含量大于80%的PVB树脂。     

影响聚乙烯醇缩丁醛产品质量稳定因素的探讨

简述了聚乙烯醇缩丁醛(PVB)生产的工艺流程。探讨了聚乙烯醇缩丁醛产品质量不稳定的原因。提出了水洗工序是PVB产品质量稳定的关键工序。     

上海石化高端PVB树脂母料打破国外垄断

正近日,由上海石化研发的高端汽车级聚乙烯醇缩丁醛树脂(PVB树脂)母料开始正式投入工业生产,此举将打破我国高端PVB树脂制造产业由国外垄断的局面。据了解,PVB树脂由聚乙烯醇(PVA)树脂和正丁醛在酸催化下缩合反应而成,广泛应用于汽车安全玻璃、建筑安     

聚乙烯醇缩丁醛树脂沉淀法生产工艺的研究

为提高聚乙烯醇缩丁醛(PVB)树脂质量,保证产品指标的稳定性,拟采用传统沉淀法工艺,通过对原液浓度、缩合反应温度及缩合反应中PVA、正丁醛、盐酸的配比进行研究,制备出缩丁醛基含量为72%的PVB树脂。     

火焰原子吸收光谱法测定PVB树脂中杂质Na的研究

聚乙烯醇缩丁醛树脂(Polyvinybutyrai,以下简称PVB,),是以聚乙烯醇(PVA)和丁醛为合成原料,以盐酸为催化剂缩合成的高分子化合物[1],工艺流程如图1.     

皖维高新拟新建PET项目

<正>2020年4月9日,皖维高新发布公告称,公司拟自筹资金投资新建3.5万t/a差别化PET聚酯切片项目、1万t/a汽车胶片级聚乙烯醇缩丁醛树脂项目及2万t/a差别化可再分散乳胶粉项目。公告显示,为进一步延伸聚乙烯醇(PVA)产品的下游产业链,拓展PVB树脂产品应用领域,提高公司PVB树脂产品的产业化水平和市场竞争力,实现汽车胶片级国产PVB树脂的进口替代,公司决定自筹资金1.42亿元投资新建1万t/a汽车胶片级聚乙烯醇缩丁醛树脂项目。     

对影响聚乙烯醇缩丁醛产品质量稳定性因素的探讨

简述了聚乙烯醇缩丁醛生产的工艺流程。探讨了聚乙烯缩丁醛产品质量不稳定的原因。提出了水洗工序是PVB产品质量稳定的关键工序。     

上海石化高端PVB树脂母料打破国外垄断

正近日,由上海石化研发的高端汽车级聚乙烯醇缩丁醛(PVB)树脂母料开始正式投入工业生产,此举将打破我国高端PVB树脂制造产业由国外垄断的局面。据了解,PVB树脂由聚乙烯醇(PVA)树脂和正丁醛在酸催化下缩合反应而成,广泛应用于汽车安全玻璃、建筑安全玻璃、太阳能光伏组件封装膜、涂料、底漆、油墨等领域,市场需求量大、附加值高。然而,目前国际上仅有少数几家公司能够生产可用于汽车安全玻璃的高质量PVB树脂。随着我国汽车工业的发展,汽车级的PVB中间膜     

无皂沉淀法制备聚乙烯醇缩丁醛

通过无皂沉淀法,以纳米二氧化硅替代表面活性剂,将丁醛通过高压均质机分散到聚乙烯醇水溶液中,制备了缩醛基含量75%以上,溶液黏度与市售树脂相当的聚乙烯醇缩丁醛(PVB)树脂(平均聚合度1700)。所得的PVB树脂粉末由粒径小于10μm的原始颗粒团聚而成,证明反应是在微小体积内进行;纳米二氧化硅黏附在颗粒的表面,起到了很好的物理隔离的作用,有效的抑制了PVB的团聚。无皂沉淀法减少了树脂洗涤用水的消耗,并且有利于树脂品质的提高。优化的反应条件为:聚乙烯醇和丁醛质量比为1∶(0.60~0.65),反应起始温度20℃,梯度升温速度为5℃/30min,pH=1.3,分散剂纳米二氧化硅用量为体系的0.07%。     

聚乙烯醇缩醛类树脂应用新领域

一、概述聚乙烯醇缩醛类树脂包括聚乙烯醇缩甲醛(PVF)、聚乙烯醇缩丁醛(PVB)、混合缩醛、缩糠醛、缩巴豆醛等等,其中迄今用途最广的是 PVB 和 PVF。缩醛类树脂都是合成粘合剂工业材料之一,具有精细化工的特点:发展快、产量小、质量高、品种多、牌号多。生产厂、以中小企业为主,专业厂少兼生产厂多。与其它粘合剂工业一样,是整个化学工业中最分散的一个行业。     

Synthesis and characterization of PVB/silica nanofibers by electrospinning process

This paper describes PVB/silica nanofibers which were fabricated by electrospinning. Although electrospinning has developed rapidly over the past few years, electrospinning nanofibers are still at a premature research stage which is a process by which polymer nanofibers can be formed when a droplet of viscoelastic polymer solution is subjected to high voltage electrostatic field. PVB/silica nanofibers were obtained when the PVB/silica precursor ratio was 15% and the average diameters ranged from 100 to 200 nm and increased with increasing solution concentration and electrospinning synthesized at 12 kV of the applied voltage. The morphologies and structures of PVB/silica nanofibers were investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), thermogravimetric analyzer (TGA), Fourier transform infrared spectrometer (FTIR), energy dispersive spectrometer (EDS).     

Effects of PVB on the gelation behavior of BaTiO3-based dielectric particles and glass suspension

The effect of polyvinyl butyral (PVB) resins on the gelation behavior of the BaTiO₃-based dielectric particles and borosilicate glass particulate suspensions was investigated in a system where organic solvents, dispersant, binder and gelation modifier were used as processing additives in a low temperature cofired ceramic fabrication processes. The strong flocculation, gels of the suspension without a modifier was attributed to the reaction and strong linkage between the boron in the borosilicate glass and the functional hydroxyl group of PVB resins, which was confirmed by Fourier transform infrared spectroscopy and scanning electron microscopy. When the butyral content of PVB employed in each slurry formulation diminish by approximately 8%, it caused the concentrated suspension to gel. The butyral content of PVB had a much greater impact on gelation than did the molecular weight of PVB. As the molecular weight of PVB was increased, the apparent viscosities of the slurries increased due to the broader chain length of higher molecular weight of PVB. According to the relative viscosity measurement results, both suspensions with high and low PVB molecules had similar viscosity values and it might be regarded as the more viscous feature of PVB polymer solution.     

F127对热致相分离法制备的亲水性PVB/F127共混中空纤维膜性能的影响(英文)

Hydrophilic poly(vinyl butyral) (PVB)/Pluronic F127 (F127) blend hollow fiber membranes were prepared via thermally induced phase separation (TIPS), and the effects of blend composition on the performance of hydrophilic PVB/F127 blend hollow fiber membrane were investigated. The addition of F127 to PVB/polyethylene glycol (PEG) system decreases the cloud point temperature, while the cloud point temperature increases slightly with the addition of F127 to 20% (by mass) PVB/F127/PEG200 system when the concentration of F127 is not higher than 5% (by mass). Light scattering results show that the initial inter-phase periodic distance formed from the phase separation of 20% (by mass) PVB/F127/PEG200 system decreases with the addition of F127, so does the growth rate during cooling process. The blend hollow fiber membrane prepared at air-gap 5mm, of which the water permeability increases and the rejection changes little with the increase of F127 concentration. For the membrane prepared at zero air-gap, both water permeability and rejection of the PVB/F127 blend membrane are greater than those of PVB membrane, while the tensile strength changes little. Elementary analysis shows that most F127 in the polymer solution can firmly exist in the polymer matrix, increasing the hydrophilicity of the blend membrane prepared at air-gap of 5mm.     

原位聚合法制备PVB/纳米Ti02复合材料及其性能与表征

利用韶声波分散法将纳米_氧化认(TiO2)均匀分散到聚乙烯醇(PVA)水溶液中,通过原位法制备了一系列不同TiO2含量的聚乙烯醇缩丁醛(PVB)纳米TiO2复合材料。采用FT-IR, UV-VIS, DSC和TG,AFM等平段对所制得的原位复合材料的结构、微观形貌和性能讲行了研究。结果表明,在合成PVB讨程中引入纳米Ti( )>粒子,能更均匀地分散在PVB笨质中,PVB对TiU粒子具有很奸的位理效果,形成了以纳米TiO2粒子为核心的网络结构。该原位复合材料的力学性能尤其是韧性得到了明显捍高,在TiO2相对PVB含量较低时其断裂伸长率就达到纯PVB的6倍左右,同时该复合材料具有良奸的紫外屏蔽性能及耐热性能,而且材料溶解后的诱明度良奸。     

Windshield recycling focused on effective separation of PVB sheet

The study is focused on windshield recycling process resulting in poly(vinyl butyral) (PVB) sheets with very low amout of remain glass particles. PVB sheets were obtained from worldwide manufacturer DuPont and then they were laminated by standard autoclaving process. One sample of PVB sheet was modified by multi‐functional organic acid in order to compare various levels of adhesion. Three‐stage technology was proposed for recycling PVB sheets. In the first‐stage laminated safety glass was mechanically cracked. In the second‐stage the adhesion reduction to minimal degree was followed by chemical‐physical assisted separation. It causes self‐release of the glass out of the PVB sheet. The third‐stage was mechanical peeling of the remaining glass from the PVB sheet which completed the recycling process. The optimal process conditions for the most effective delamination process were found. Delamination technology produces PVB sheet with minimal residual glass content (up to 300 ppm) and minimal change in PVB sheet properties. Described recycling technology is ecologically friendly (the effluent is fully recyclable as well) and could reduce the worldwide problem with windshield waste disposal. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131, 39879.     

PVB胶片制造技术及国内市场发展趋势

本文主要介绍了PVB胶片的通用制造技术、国内各领域的PVB市场的规模及趋势、PVB胶片及原材料的价格走势,同时,从专利角度,分析了中国PVB技术现状。     

安全玻璃夹层用PVB膜片生产工艺配方的设计

采用胶片级聚乙烯醇缩丁醛(PVB)树脂为基础树脂，选用了不同的增塑剂和助剂，制成了夹层玻璃所用的膜片，分析了工艺流程中各原材料对产品质量的影响。实验表明，PVB树脂颗粒须粒径均匀，不同用途的夹层玻璃需选用不同的增塑剂，同时进行相应生产工艺的调整，才能实现稳定连续的生产。     

PVB胶片对夹层玻璃产品质量的影响

在夹层玻璃生产中PVB胶片的质量直接影响制成品的质量和使用寿命.本文从胶片的来源种类来分析PVB胶片对夹层玻璃质量的影响,希望有助于中国玻璃深加工行业健康的发展.     

Pyrolysis of polyvinyl butyral (PVB) binder in thermoelectric green tapes

The pyrolysis of polyvinyl butyral (PVB) binder and other organic additives in thermoelectric green tapes, are analysed through differential thermal analysis (DTA), thermogravimetric analysis (TGA) and published results of fourier transformer infrared spectroscopy (FTIR). Based on these analyses the optimum balance of binder degradation mechanism, heating rate, burnout temperature and burnout atmosphere were determined. The maximum upper temperature at which pyrolysis can take place in an oxidising atmosphere, was imposed at 450°C, to avoid the risk of oxidising the thermoelectric material above this temperature, which could degrade its thermoelectric properties. Thermoelectric cast green tapes made with PVB formulation were found to leave char residue after pyrolysis at 450°C, estimated to be almost 20% of the total PVB content in the tape. Different pyrolysis atmospheres of air, argon, CO₂ and Ar/H₂O were used to minimise the char content. The best pyrolysis for the PVB was obtained with the use of CO₂ atmosphere at 450°C with a hold-out time of 5 h, which reduced the char residue to only 1%. Even with this small percentage, the char residue was in the form of a very fine black powder (soot) which covered the thermoelectric material powder in the tape, preventing its densification at the later stages of the sintering process. It was therefore concluded that the PVB system was not a suitable binder candidate to be used in the fabrication of thermoelectric generator by the tape casting method.