PVB树脂生产的影响因素及产品微观形貌表征

对PVB树脂生产过程中PVA浓度、反应温度、反应时间、催化剂种类及浓度、丁醛用量、搅拌速度及形式、反应釜类型等因素对PVB树脂合成工艺的影响进行了分析,并通过TEM和SEM对PVB树脂在溶液中的微观形貌和产品粉末形状进行了表征,为PVB树脂生产企业的技术进步提供参考。     

聚乙烯醇缩丁醛的节水工艺

每生产1吨PVB树脂需耗水约65吨,如何减少PVB生产耗水量,是PVB行业研究的永恒主题。通过研究,提供了水洗水循环使用、水洗和离心脱水多次循环、添加乳化剂水洗、温水水洗四种节水方案。     

汽车前挡玻璃夹层PVB膜厚度及含水率对性能的影响

通过对国内外4家企业生产的聚乙烯醇缩丁醛（PVB）膜进行测试,观察PVB膜厚度、含水率、拉伸性能与表面纹路对其使用性能造成的影响。结果表明,厚度稳定性好且含水率低的PVB膜具有更高的拉伸强度和断裂伸长率,这对提高玻璃的耐撞及吸能防护性能具有重要意义;厚度稳定性好的PVB膜表面纹路分布也相对更均匀。     

国内最大的汽车PVB膜片厂投产

国内最大产能的专业汽车PVB(聚乙烯醇缩丁醛)膜片企业——武汉泓锦旭隆新材料有限公司日前在武汉市蔡甸后官湖工业园正式投产,这是华中地区首家专业生产汽车玻璃中间膜的企业。该公司与华中科技大学合作,研制出汽车领域的PVB膜片、光伏太阳能级PVB膜片和中高档建筑级PVB膜片,是国内第一家自主研发并生产汽车夹层     

PVB胶片质量检测结果影响因素分析

通过对夹层玻璃用PVB胶片的厚度、挥发物质量分数及黄色指数的不同测试比较,分析了检测仪器设备、检测方法对检测结果的影响,对夹层玻璃生产过程中原材料的质量控制以及PVB产品标准的修订提出了建议。     

聚乙烯醇缩丁醛的市场分析

聚乙烯醇缩丁醛（PVB）具有优良的黏结性和光学性能,广泛应用于安全玻璃的夹层主材料。低端产品用于建筑安全玻璃,高端产品在军工上作为飞机、坦克、舰艇的防弹玻璃,也广泛用于汽车挡风玻璃。目前世界PVB树脂及膜的生产和消费主要集中在美国、西欧和日本等经济发达地区。近年来．由于汽车、航空、航海等行业的蓬勃发展,带来了高端PVB巨大的市场容量,国产高端PVB也在市场的推动下开始发展。     

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。     

PVB边角料用于硬质聚氯乙烯的改性研究

利用汽车夹层玻璃生产中所产生的大量边角料聚乙烯醇缩丁醛(PVB)来改性硬质聚氯乙烯(PVC-U),以提高PVC-U的冲击性能,测试了PVC-U/PVB共混物的冲击性能、拉伸性能及加工性能,并用场发射环境扫描电子显微镜(SEM)对其进行了断面形貌分析.结果表明,当100份PVC-U中加入5份PVB时,PVC-U/PVB体系的相容性较好,其冲击性能是纯PVC-U的2倍以上,而体系的拉伸性能变化不大,同时加工性能也得到了很好的改善.     

PVB树脂生产工艺对其稳定性的影响

从树脂生产过程中分析了胶片PVB树脂稳定性不好的原因,并通过工艺调整,提出了提高PVB树脂稳定性的有效改进方案。     

高堆积密度聚乙烯醇缩丁醛（PVB）树脂合成和应用研究

PVB中间膜由聚乙烯醇缩丁醛树脂经增塑剂混炼挤压制成,其性能大部分由聚乙烯醇缩丁醛树脂的品质决定。介绍了普通堆积密度PVB的主要现有工艺流程,重点介绍了高堆积密度PVB树脂现有合成工艺和改进工艺。利用多种材料分析设备,如SEM、GPC、DSC、TG、流变仪等仪器,对新工艺合成的PVB树脂进行了高分子性能表征,同时将新旧工艺下合成的PVB树脂性能数据进行了对比、分析和总结。并对新工艺合成的高堆积密度PVB树脂的性能优势进行了深度应用试验探究,最终得出新工艺生产的高堆积密度PVB树脂无论在光学和力学测试上的表现还是耐热性、耐候性、杂质含量以及边缘稳定性上的测试表现都明显优于旧工艺合成的PVB树脂。     

Fabrication of Polypropylene Nanofibers from Polypropylene/Polyvinyl Butyral Blend Films Using Laser-Assisted Melt-Electrospinning

Polypropylene (PP) nanofibers, a few hundred nanometers in diameter, are of immense importance in the fiber industry. This article reports the fabrication of delicate PP nanofibers. Polyvinyl butyral (PVB) was added to PP as a blend component, and a nozzle-free melt-electrospinning system with a line-like CO₂ laser melting device was used to manufacture PP nanofibers. We investigated the effect of PVB ratio on fiber diameter. The addition of PVB was found to be potentially very beneficial in PP/PVB blends, resulting in improved PP crystallinity and a steady decrease of fiber diameter with high productivity. The reduction of fiber diameter was attributed to the decline of viscosity, increase of surface adhesion properties, and polarity of blends due to the inclusion of PVB. To produce PP nanofiber, the PVB was removed from PP/PVB blend fibers with an ethanol treatment. A drastic drop of PP fiber diameter followed by fiber splitting was observed after PVB removal. We obtained PP nanofibers with a diameter as low as 181 ± 105 nm from the blend fiber with 90% PVB. Infrared spectroscopy of fibers demonstrated that PP fibers from pure polymer and blends showed the same characteristic peaks. POLYM. ENG. SCI., 60: 362–370, 2019. © 2019 Society of Plastics Engineers     

聚乙烯醇缩丁醛作为界面改性剂制备聚已二酸-对苯二甲酸丁二酯/竹粉复合材料

将聚乙烯醇缩丁醛（PVB）作为非反应型界面改性剂用于聚已二酸-对苯二甲酸丁二酯（PBAT）/竹粉木塑复合材料的制备,考察了其界面改性效果及对材料力学性能的影响。PVB分子中的羟基与缩醛基可以分别与竹粉表面的极性基团以及树脂基体相互作用,从而提高复合材料的界面相容性。结果表明,PVB直接添加或溶液添加对复合材料的力学性能影响不大;PVB使PBAT与竹粉的界面结合明显改善。在竹粉含量为30 %（质量分数,下同）下,PVB含量为竹粉含量的1 %时,复合材料的拉伸强度从5.16 MPa提高到6.02 MPa。     

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     

Study of the composition effect of glass ceramic and silver on poly(vinyl butyral) thermal degradation with thermogravimetric analysis

The thermal degradation of poly(vinyl butyral) (PVB)/glass ceramic, PVB/Ag, and PVB/glass ceramic/Ag composites was investigated with thermogravimetric analysis in nitrogen and air. Thermogravimetric data revealed that the compositions of both inorganic materials in air could greatly influence the thermal degradation of PVB. The degradation reactions of PVB/ceramic and PVB/Ag composites began earlier and accelerated rapidly at lower temperatures. The overall degradation period was obviously shortened for the thermal degradation of PVB/Ag in air, whereas a longer time was required for the PVB/ceramic composite than for PVB. Moreover, dual effects of ceramic and Ag on the thermal degradation of PVB were observed for PVB/ceramic/Ag composites. In addition, the catalytic effects of ceramic and Ag on the degradation reaction of PVB in air were verified with a kinetic analysis. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 93: 2142–2149, 2004     

聚乙烯醇缩丁醛薄膜老化机理研究

利用红外光谱和力学性能的变化研究了聚乙烯醇缩丁醛薄膜的热老化和紫外光老化机理,结果表明,在热老化及紫外光老化过程中,PVB薄膜的拉伸强度均是先增大然后再减小。这是由于在热老化过程中PVB薄膜发生了增塑剂的损失及PVB分子主链和侧链的断裂,而在紫外光老化过程中,主要是发生PVB分子链之间的交联反应,仅有少量的分子链发生断裂。PVB薄膜的光老化和热老化都是由树脂中存在少量聚醋酸乙烯分解生成的自由基诱导而发生的,添加适量的热稳定剂和紫外吸收剂可以吸收薄膜加工时生成的自由基,从而提高薄膜的稳定性及粘结性能。     

PVB光致变色夹层安全玻璃的制备及性能研究

以1,2,3,3-四甲基吲哚啉碘化物和5-硝基水杨醛为原料合成了光致变色吲哚啉螺吡喃化合物,并将其制成了一种PVB光致变色夹层安全玻璃,对其抗冲击强度性能和光照前后紫外可见光谱进行了分析测试。结果表明,所制备的PVB夹层安全玻璃符合GB9 962-1999中对安全玻璃强度的技术要求,同时还具有调光作用和光致变色性能。     

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。     

Manufacture and characterization of ultra and microfiltration ceramic membranes by isostatic pressing

This paper describes the manufacture of tubular UF and MF porous and supported ceramic membranes to oil/water emulsions demulsification. For such a purpose, a rigorous control was realized over the distribution and size of pores. Suspensions at 30 vol.% of solids (zirconia or alumina powder and sucrose) and 70 vol.% of liquids (isopropyl alcohol and PVB) were prepared in a jar mill varying the milling time of the sucrose particles, according to the pores size expected. The membranes were prepared by isostatic pressing method and structurally characterized by SEM, porosimetry by mercury intrusion and measurements of weight by immersion. The morphological characterization of the membranes identified the formation of porous zirconia and alumina membranes and supported membranes. The results of porosimetry analysis by mercury intrusion presented an average pore size of 1.8 μm for the microfiltration porous membranes and for the ultrafiltration supported membranes, pores with average size of 0.01-0.03 μm in the top-layer and 1.8 μm in the support. By means of the manufacture method applied, it was possible to produce ultra and microfiltration membranes with high potential to be applied to the separation of oil/water emulsions.     

Mechanical Properties of Nylon 6,6/Polyvinyl Butyral Blends

The mechanical properties of Nylon 6,6 blended with recycled scrap material, polyvinyl butyral (PVB), using maleated styrene-ethylene-butylene-styrene block copolymer (SEBS-g-MA) as a compatibilizer are discussed. Control samples of Nylon 6,6/PVB blends and Nylon 6,6/SEBS-g-MA blends were also compared. The results show Nylon 6,6/PVB blends give higher tensile strength than Nylon 6,6/SEBS-g-MA blends. As for Nylon 6,6/SEBS-g-MA/PVB blends, impact strength increases with increasing the dosage of SEBS-g-MA. PVB improves flexural and tensile properties but sacrifices impact strength of the blends. Meanwhile, the ductile-brittle transition temperature (DBTT) increases with increasing PVB content. Through morphology observation, hole sizes are smaller with increasing SEBS-g-MA content. In summary, suitable amounts of PVB scrap are vital to balance both rigidity and toughness of blends. This study helps to understand the role of PVB in Nylon 6,6 blend systems, which allows PVB to find a practical application based on economic and environmental concerns.     

Morphology and electrical properties of carbon‐black‐filled poly(ϵ‐caprolactone)/poly(vinyl butyral) nanocomposites

The morphology of poly(ε‐caprolactone) (PCL)/poly(vinyl butyral) (PVB)/clay nanocomposites was studied as a function of a small amount of amorphous PVB by polarized optical microscopy. The band spacings of PCL spherulites in PCL/PVB/clay nanocomposites decreased with increasing PVB content, and this indicated that increasing the PVB content shortened the period of lamellar twisting. The electrical properties of PCL/PVB/clay nanocomposites containing carbon black (CB) were also measured as a function of the PVB content. For samples with the same CB content, the intensity of the positive temperature coefficient (defined as the ratio of the peak resistivity to the resistivity at room temperature) of the nanocomposites increased as the PVB content increased. The change in the positive temperature coefficient was related to the morphological differences (i.e., the period of lamellar twisting) in the nanocomposites. © 2003 Wiley Periodicals, Inc. J Appl Polym Sci 88: 1022–1031, 2003