丙烯酸酯压敏胶粘剂的发展

压敏胶粘剂中最为重要的则是橡胶系和丙烯酸酯系压敏胶粘剂，而丙烯酸酯系压敏胶粘剂由于具有较橡胶系压敏胶粘剂更为优异的综合性能，成为目前最重要的一类压敏胶粘剂，其形态分为溶剂型、乳液型、热熔型、反应性液体固化型四大类。我国压敏胶粘剂工业的发展也是随着丙烯酸酯单体及共聚合物的生产的发展而发展起来的。1986年我国压敏胶带的产量为0．6亿平方米，1992年增长为匕亿平方米，高于1992年日本压敏胶带的产量11．9亿平方米，这些胶带大多是以丙烯酸酯压敏胶粘剂涂布而成的。丙烯酸酯压敏胶粘剂经近二、三十年的迅速发展，其制造技…     

压敏胶带中剥离应力分布模型的建立

分析了传统的压敏胶带肃离应力理论模型建立中的推导过程，指出这些模型建立过程中存在着明显的不足之处，给出了压敏胶带肃离应力分布的粘弹性力学模型。     

四元共聚核壳乳液粘合剂

目前，国内外几乎所有的包装纸箱都开始采用双向拉伸聚丙烯(BOPP)压敏胶带封装，国内自行设计生产和引进的众多压敏胶带涂布生产     

高强度丙烯酸酯双面压敏胶带的研制

研究了一种高强度丙烯酸酯双面压敏胶带的制备和性能。讨论了丙烯酸树脂、增粘树脂、交联剂等对双面压敏胶带性能的影响。该胶带能够满足汽车、冰箱等生产工艺要求     

双面压敏胶带实现可移除性能的几种途径

针对用户在双面压敏胶带产品使用中对于可清洁移除无残胶的要求,描述了胶带移除时可能产生的几种情况,综述了当前压敏胶带制造行业内研发较为成熟的几类具有可移除性双面压敏胶带产品以及各自的特点和使用方法,为今后有此类需求的用户在产品选择时提供了参考依据。     

美国化学文摘(CA)Vol.113(1990)——胶粘剂题录(Ⅱ)

<正> 压敏、带 98963 具有间歇粘合剂层的压敏胶带。DE 3,829,077 98983 粘附力和内聚力具有良好平衡的胶带。日本公开特许 02,75,679 99021 纸基材胶带。DE 3,835,507 99121 压敏胶带用基材。日本公开特许02,102,283,02,102,284 99219 固定未烧结陶瓷器件用胶带。日本公     

高强度丙烯酸酯双面压敏胶带的研制

介绍了一种高强度丙烯酸酯双面压敏胶带的制备和性能。选用了一种新的功能单体二环戊二烯马来酸酯（ＤＨＣＭ）参与丙烯酸酯共聚，讨论了丙烯酸树脂、增粘树脂、交联剂等双面压敏胶带性能的影响。该胶带能够满足汽车、冰箱等生产工艺要求。     

新型PVC压敏胶带

<正>江苏琼花高科技股份有限公司制备出一种PVC压敏胶带新产品。该产品可覆盖在PVC白基卡两侧面,经层压板加热加压后可增强PVC白卡基与PVC压敏胶带之间的附着力,形成光亮表面,新颖又实用。PVC压敏胶带可     

重庆长江橡胶厂开发的牛皮纸压敏胶带新产品通过了市级鉴定

压敏胶带在国外是一类使用面很广、用量很大的产品,在国内随着国民经济的发展,人民生活水平的提高,使用范围也在逐渐扩大,用量也逐年增加。压敏胶带可用于电绝缘、包装物封口、捆扎物品、商标、标志、电镀和喷漆物件的遮盖、加工工件的表面保护等。牛皮纸压敏胶带是以贴塑牛皮纸为基材,贴塑面涂以硅橡胶使防粘,纸面涂以压敏胶粘剂使具备粘合性能。牛皮纸压敏胶带主要用于包装物,如纸箱、钙塑箱等的封口。重庆长江橡胶厂开发的牛皮纸压敏胶带具有粘合力高、快粘性好、解卷容易、操作     

丁腈橡胶／丙烯酸酯UV固化压敏胶的研究

将丁腈橡胶溶于丙烯酸酯类混合单体中制成胶液，在常温下涂布于基材后进行紫外光辐照制备压敏胶带。采用红外光谱对UV辐照下的聚合过程进行了扫描分析并提出了固化机理。研究了光引发剂、UV辐照剂量、体系组成等对压敏胶带综合性能的影响。     

Enhancement of Turbulent Flow Heat Transfer in a Tube with Modified Twisted Tapes

Numerical simulations were performed to study the fluid flow and heat transfer in a tube with staggered twisted tapes with central holes. In the range of Reynolds numbers between 6000 and 28 000, the modified twisted tapes increased the Nusselt number by 76.2 ～ 149.7 % and the friction factor by 380.2 ～ 443.8 % compared to the smooth tube. Compared to the typical twisted tapes, the modified twisted tapes produced an acceleration flow through the triangle regions leading to the enhancement of heat transfer, and the holes in the modified tapes reduced the severe pressure loss. It was found that the modified twisted tapes decreased the friction factor by 8.0 ～ 16.1 % and enhanced the heat transfer by 34.1 ～ 46.8 % in comparison with the typical tapes. These results indicated that the performance ratio values of the tube with modified twisted tapes were higher than 1.0 in the range of Reynolds numbers studied. The computed performance ratios of the tube with modified twisted tapes were much higher than those of the tube with typical twisted tapes. This means that the integrated performance of the tube with staggered twisted tapes with central holes is superior to that of the tube with typical twisted tapes.     

Permeability of Laminated Green Ceramic Tapes as a Function of Binder Loading

The gas permeability of laminated green ceramic tapes was determined versus organic loading for samples subjected to air oxidation. The dielectric in the tapes was barium titanate, and the binder consisted primarily of poly(vinyl butyral) and dioctyl phthalate. Both the normalized gas flux and the gas permeability were seen to approach constant values for five or more tapes laminated together. Because the characteristic pore size was 0.5–1 μm, Poiseuille flow was the dominant flow mechanism, and thus Darcy's law was valid. The permeability of five laminated tapes was a factor of five smaller than for unlaminated tapes. Values were also obtained for the permeability versus binder loading in terms of the microstructural features of specific surface, porosity, and a parameter to account for tortuosity and constrictions.     

Viscoelastic analysis applied to the determination of long‐term creep behavior for magnetic tape materials

Creep‐compliance experiments were performed for three representative magnetic tapes. Two of these tapes used a magnetic particle (MP) coating, and one used a metal‐evaporated (ME) coating. The MP tapes used the following polyester substrates: semitensilized poly(ethylene naphthalate) (PEN) and supertensilized poly(ethylene terephthalate). The ME tape used an aromatic poly(amide) or aramid substrate. Time–temperature superposition was used to make creep‐compliance predictions at 30 and 50°C reference temperatures. Comparisons were made with dimensional stability requirements based on position error signal (PES) specifications for magnetic tape drives along with in‐cartridge creep specifications based on PES measurements. Circumferential and lateral creep strains were determined that account for storage of the tapes in a reel, and creep strains were predicted for future tapes with thinner, lower compliance coatings. A rule of mixtures method was also used to extract compliance information for individual layers of MP‐PEN tapes, and stress profiles through the thickness of the tapes were determined. Additional measurements and analyses were performed to determine the creep recovery and shrinkage characteristics for the magnetic tapes. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 102: 1106–1128, 2006     

Influence of the aging time of yttria stabilized zirconia slips on the cracking behavior during drying and green properties of cast tapes

Tape-casting process was used to produce yttria stabilized zirconia (YSZ) substrates in an aqueous system using a low amount of an acrylic latex binder. Concentrated suspensions with different aging times were cast, and the influence of the slip aging time on the drying kinetics and cracking behavior of the tapes were studied. In addition, the effect of the slip aging time on the properties of the resultant green tapes was investigated. The latex particles consolidated by coalescence during the aging time of the slips and resulted in an increase in the smaller pore size of the cast tapes. The pore radius increased with increasing the slip aging time up to 14 days thereby decreasing the capillary pressure in the liquid. Aging times over 14 days did not change the pore radius and consequently the capillary pressure. The capillary tension drove the consolidation; the tapes produced from slips with lower aging times which had higher capillary pressure shrank more, had lower pore volume and consequently higher green density. Cracking was found in tapes prepared from slips with aging times shorter than 14 days; the crack area decreased with increasing the slip aging time. For slip aging time ≥14 days cracking was not observed. Aging before casting up to 14 days reduced cracking in tapes prepared with low amounts of latex; however, the lower capillary pressure resulted in low green density of the cast tapes.     

Analysis of audio magnetic tapes with sticky shed syndrome by ATR‐FTIR

Audio magnetic tapes that are difficult to play may be affected by a form of degradation called “sticky shed syndrome” (SSS). SSS exhibits physical symptoms during playing such as squealing, not packing tightly on the reel and possible tape material loss during playing. This research investigated attenuated total reflectance Fourier transform infrared spectroscopy (ATR‐FTIR) to identify spectroscopic markers for SSS in audio magnetic tapes with poly(ester urethane) (PEU) binder layer. This article presents results for applying this technique to 50 audio magnetic tapes from the Library of Congress (LC) collections. This technique and analysis is intended to be used as a tool in identifying audio magnetic tapes with SSS from the mid 1970s through the 90s for improved preservation and to increase workflow in libraries and archives. This ATR‐FTIR technique had a success rate of 71% for identifying SSS tapes and 86% for non‐SSS tapes. The research also discusses spectral and chemical changes in the PEU binder layer between SSS tapes, non‐SSS, and SSS tapes treated by baking including changes in hydrogen bonding of the carbonyl groups. The results support chemical/physical changes occurring in the soft segment of the PEU binder layer of SSS tapes. The absorption ratio of free to hydrogen bonded carbonyl groups was also correlated with SSS. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

电气胶带用有机硅压敏胶的研制

通过MQ硅树脂和端羟基聚二甲基硅氧烷(PDMS)的硅醇缩合反应制备有机硅压敏胶溶液,将合成的有机硅PSA压敏胶溶液涂布在基材上干燥后得到有机硅压敏胶胶带(PSA),研究了PSA的合成配料、工艺以及胶带生产工艺对压敏胶带性能的影响。结果表明,硅树脂/硅橡胶比例在1.2~1.4之间具有良好的初粘、持粘和剥离力,硅树脂含量增加胶带耐热性增强;此外,反应真空度低于0.07MPa,反应温度高于140℃,且添加2%~3%左右的BPO时所制备的PSA胶带具有良好的综合性能。     

Strength of Tape Cast and Laminated Ceramics

Monolithic A1₂O₃ ceramic laminates were fabricated via a tape casting process. The strength of single tapes was compared with that of laminates, using biaxial flexure tests. The fracture stress was similar. However, the laminates presented a lower Weibull modulus. The feasibility of eliminating or diminishing void-type flaws present in the green tapes was also assessed. To this end, tapes were first punctured, then laminated and sintered, and the effect of these known flaws in the final ceramic was assessed in four-point flexure tests. The thermocompression of green tapes during laminate fabrication was found to modify the flaws to a more forgiving morphology.     

Influence of tapes’ properties on the laser cutting process

Ceramic tapes are used to build 3-dimensional components and microsystems in layer manufacturing. The tapes are individually printed and structured before being stacked and laminated. The structuring process of the tapes affects the maximal resolution of fluidic channels, suspended bridges and beams, which in turn determines the scale of miniaturization of the produced components. The aim of this paper is to investigate if the tape composition can be optimized to improve the cutting resolution of laser cutting, which is a very flexible tool for micromachining. Using the Siemens star pattern, the laser cutting resolution was measured for alumina green tapes of different binder compositions with different laser settings. For all tapes the resolution was better the higher the laser beam velocity. At higher velocity though, a higher number of cutting cycles is necessary to cut the tape. The laser cutting resolution depends on the binder composition, but the laser parameters must also be optimized to achieve high cutting resolution.     

The preparation of SiCP/Ag–Cu–Ti hybrid tapes and application in the joining of silicon carbide ceramics

Abstract

A novel method of tape casting to fabricate ceramic-particulate-reinforced composite filler alloy tapes with low organics (no more than 6?wt.%) was developed, with which SiC_P/Ag–Cu–Ti hybrid tapes were successfully prepared and used in joining of sintered silicon carbide ceramics. The stress rheometer, scanning electron microscopy and energy dispersive spectrometer were used to characterize the rheological properties of slurry and microstructure of green tapes and joints. The slurry for tape casting consists of dispersant, binder, solvent, a mixture of ceramics particulates and metal powders, and no plasticizer was added. Castor oil phosphate was proven the suitable dispersant for the slurry, and the content of dispersant, binder, solid loading was optimized as 3?wt.%, 2.6?wt.% and 26?vol.%, respectively. The fabricated hybrid tapes possess good ductility and uniform thickness. The SiC particulates were homogeneously distributed in the metal powders matrix in both sides of the green tapes, and the distribution was retained in the SiC/SiC joints.     

(Bi,Pb)2Sr2Ca2Cu3Ox超导带材的微结构研究

对Ｂｉ系带材内部的微观组织进行了详细研究,发现带材横截面内各部位的织构度和显微度存在差异,从银层和氧化物接触面处到粉芯中心,织构度依次减弱,而显微硬度逐渐增加,中心区组织凌乱,存在着许多大而硬的杂质第二相,织构度梯度的存在表明带格截面内各部位晶粒的取向差异,减少非超导相,有助于获得高Ｊｃ,分析表明,轧制和冷压过程少的应力不均匀造成了带材内部变形的不均匀,这一切就导致带材内部组织结构的不均匀,因此为