聚氨酯粘合剂不同配比对味精复合袋质量的影响

采用聚氨酯粘合剂(双组分)的不同配比对味精复合袋(BOPP(20μm)／LDPE(45μm))的复膜质量与阻隔性能的试验研究，提出了合适的聚氨酯粘合剂的配比。     

淀粉粘合剂的研制及纸张复合性能的测定与分析

以玉米淀粉为原料,用正交法筛选出适合瓦楞纸粘合的最佳粘合剂原料配比,结合反应机理分析了配料用量对粘合荆性能的影响,并通过测定纸张在采用成品粘合剂前后复合性能的变化,对所选粘合剂的原料配比进行了验证.结果表明,玉米淀粉粘合荆的最佳配方为:玉米淀粉与次氯酸钠、NaOH、水的质量比分别是1∶0.4、1∶0.1、1∶6.5,由此原料配比制得的粘舍剂稳定性好,初始粘接力强,使复合后的普通瓦楞纸的耐破度、耐折度和戳穿强度均得到显著提高.     

铝-塑复合板用聚氨酯粘合剂的研究

本文介绍了铝-塑复合板用聚氨酯粘合剂的合成方法,讨论了原料配比、反应温度、水含量、(-NCO)(-OH)的配比对粘合性能和剥离强度的影响。     

新型包装复合膜粘合剂的研制

本论讨论了用SBS热弹性体改性酚醛树脂的复合膜粘合剂的过程,通过对SBS热弹性体改性酚醛树脂的复合膜粘合剂的研究与探索,试图配制出一种新型的无毒,成本低,耐蒸煮的粘合剂。通过改变反应条件（反应的温度,反应的催化剂,反应的时间）和原料的配比,找出了用SBS热弹性体改性酚醛树脂复合膜粘合剂的一种比较合适的反应条件和方法,并讨论了其中的反应机理。     

日本录象带生产

目前录象带的生产方法基本分两大类:一类是通过粘合剂将磁粉涂布于聚酯带基上,另一类是直接将钴镍等金属蒸着在带基上。现将近两年来日本专利中发表的有关这两类磁带的制造方法作一介绍。一、粘合剂型录象带一般粘合剂型磁带的制造方法是将磁粉与粘合剂、固化剂等均匀混合制成磁浆,然后涂于带基上,干燥后磁化定向,并砑光。东京电气化学工业公司(TDK)在试验中曾采用如下表所示的磁浆配比,然后在20微米厚的聚酯带基上涂布,得4微米厚的干磁层。     

锂电池专用粘合剂研究进展

简要介绍了锂电池专用粘合剂的用途和分类,叙述了油溶性粘合剂和水溶性粘合剂的常见品种和特点,比较了油溶性粘合剂和水溶性粘合剂的优缺点,详细分析了聚偏氟乙烯均聚物和共聚物以及聚四氟乙烯乳液、丁苯乳液、聚丙烯酸酯乳液的研究与应用现状,进而探讨了锂电池专用粘合剂今后的发展前景。     

医用粘合剂的研究及应用进展

本文按医用粘合剂材料分类 ,介绍了化学粘合剂和生物粘合剂的发展现状及展望 ,并分别对其代表品种α -氰基丙烯酸酯类粘合剂和纤维蛋白粘合剂的粘接机理、特点进行了详细论述。     

做好粘合剂的选购与质量控制和管理

正粘合剂是纸箱生产的重要原材料,是决定纸箱产品加工质量的关键环节之一,也是纸箱生产质量的源头环节。所以,粘合剂的采购和使用是否得当,不仅影响着生产效率,而且也直接影响着纸箱产品的加工质量。所以,正确认识粘合剂的若干知识,做好粘合剂的采购控制,对于提高纸箱生产效率和产品质量,具有十分重要的意义。纸箱粘合剂的若干种类和特性的认识用于纸箱生产加工的粘合剂主要有:淀粉粘合剂、白乳胶、覆膜胶等,其中,淀粉粘合剂多用于单面机瓦楞纸板成型的粘合,以及瓦楞纸板与预印面纸的粘合。淀粉粘合剂可以由     

淀粉粘合剂性能改善研究

淀粉粘合剂由于其无毒、无污染、粘性好和成本低等优点而备受青睐，用天然淀粉制作各种粘合剂已成为国内外的发展趋势。但是淀粉粘合剂干燥速度慢，成品放置一段时间粘度会下降．这些都影响了淀粉粘合剂的使用。为此笔者做了大最的试验和研究．对淀粉粘合剂的性能进行改进并取得了一定的成果。研制出的淀粉粘合剂粘度下降现象改善．干燥速度提高．     

国内软包装复合粘合剂现状及发展趋势

本文介绍了食品包装复合薄膜用溶剂型、无溶剂和水性聚氨酯粘合剂的发展概况;详细介绍了溶剂型聚氨酯粘合剂组成、分类和研究进展;简要地介绍了无溶剂和水性聚氨酯复合粘合剂的优缺点,并对各种类型的聚氨酯粘合剂的优劣及发展状况进行评述。     

东方龙虱(雄性)抱握足形态学及吸附特性

研究了东方龙虱(雄性)抱握足上吸附脚掌的形态结构、吸附机制及其在2种不同表面的吸附特性。扫描电镜观察发现其吸附脚掌由4排吸附结构及其外围的吸附刚毛群构成,其吸附结构由约15个“鞋垫”状微吸盘平行并排构成一体。吸附机制为微吸盘的真空负压吸附和刚毛群的范德华力粘附。实验测定吸附脚掌在东方龙虱鞘翅表面和玻璃表面产生的最大法向吸附力为53.3 mN,最大切向吸附力为213.5 mN。在2种表面上(干、湿状态)其切向吸附力均远大于法向吸附力,大约是法向吸附力的6～8倍,同时吸附脚掌在湿表面的切向吸附力比干表面大得多,法向吸附力却相反。法向吸附力主要由刚毛群的范德华力产生,而切向吸附力由真空吸附和范德华力共同产生。     

高速自动糊盒机胶层厚度影响因素的研究

针对高速糊盒机喷胶流量对胶层厚度的影响,以Navier-Stokes方程为框架,运用计算机流体动力学(CFD)求解技术,对胶体粘度、压力、胶孔直径大小和位置相互之间的影响进行模拟和实验,找出规律.得出为确保胶层厚度为0.3mm,要求糊盒机速度50m/s以下时出胶应成点状,大于50m/s时出胶应成线状,胶压应与速度成线性关系.     

改性木薯淀粉胶黏剂的制备及性能研究

目的 探究不同含量的氧化剂、糊化剂以及交联剂对木薯淀粉性能的影响。方法 通过红外、流变学表征方法系统研究了糊化剂(NaOH)和氧化剂(NaClO)用量对淀粉胶黏剂性能的影响。结果 当加入16%(相于干淀粉质量而言)的NaClO作为氧化剂时,淀粉胶黏剂的初黏力和黏度都达到最佳。当加入10%(相对干淀粉质量而言)的NaOH作为糊化剂时,淀粉在室温下就能发生糊化,形成黄色透明状胶黏剂,此时,胶黏剂有明显的触变性。结论 NaClO的加入可以很好地改变淀粉胶黏剂的流动性,但过量的NaClO会使胶黏剂黏度过小,并致耐水性和黏结性不足。适量的NaOH加入可以使淀粉的黏度增加,但过量的NaOH会减弱重新缠结的淀粉高分子链间的作用力,导致黏度下降。硼砂的加入能与淀粉分子形成络合物,使淀粉胶黏剂的黏度有明显提升。     

An explicit FE-model of impact fracture in an adhesive joint

Dynamic fracture of an adhesive layer in a structure is analysed. The structure represents some specific properties of an automotive structure and is simple enough to allow for closed form solutions obtained by the method of characteristics. These solutions are compared to results of explicit FE-analyses. The FE-solutions agree with the closed form solutions. Damage is included in the FE-model. Three constitutive models of the adhesive layer are used. It is shown that an amplification of the strain rate is achieved in the adhesive layer. It is also shown that an artificially increased flexibility of the adhesive in an aluminium structure gives only minor influences of the general behaviour. In some load cases, the adhesive layer will experience repeated loading/unloading. It is shown that in these cases an explicit FE-analysis with a “large” time step is more prone to give immediate rupture. Thus, the method is conservative.     

Roles of AOT molecules on the adhesive force between surfaces in cyclohexane with water contamination

The roles of water and sodium bis (2-ethylhexyl) sulphosuccinate (AOT) molecules on the adhesive force between a mica plate and a SiO₂-surface in cyclohexane are investigated at the molecular level using an atomic force microscope (AFM). A small amount of water which is able to be dissolved into cyclohexane generates a strong adhesion force between hydrophilic surfaces, which is considered to be caused by the water bridging between surfaces. When the AOT is added to cyclohexane contaminated by water, the adhesive force decreases with the concentration of AOT, because of the removal of water available to form the water bridging. However, when a large amount of water is dissolved into cyclohexane with AOT, excessive water accumulates to form thin layers on the surfaces on which AOT adsorb standing to form firm layers. As long as the AOT layers are not broken, the adhesive force is negligible, but once they are broken by a force greater than a critical pushing force, the adhesive force appears. A possible mechanism for the adhesive force is illustrated schematically.     

超薄铝合金胶粘接及激光焊接工艺研究

目的 为了解决厚度为0.05 mm的铝合金在激光焊接过程中,材料发生变形导致的焊穿或者虚焊问题.方法 采用在下层铝合金材料表面均匀涂覆粘胶剂,将上下2层铝合金材料进行预固定,然后采用激光焊接,形成焊缝.通过控制涂覆粘胶剂的次数,得到胶层厚度为11.2μm,对涂覆粘胶剂的铝合金进行激光焊接实验.结果 当激光平均功率为150 W,焊接速度为100 mm/s,离焦量为2 mm时,焊缝剪切强度最大,为124 MPa,达到母材剪切强度的82％.结论 通过粘胶剂预固定后,在激光加热过程中,可以很好地克服材料的变形,让上下材料形成熔池,熔池冷却凝固后熔合在一起形成焊缝,可以解决材料发生变形导致的焊穿或者虚焊问题.     

不同温度下胶粘剂粘接接头表界面元素变化行为的EDX分析

EDX 是一种研究粘接接头和聚合物基复合材料表界面性能的分析测试方法。利用EDX 对粘接接头表界面主要元素变化行为进行分析研究, 表明C/ C 复合材料从常温到900 ℃, Z 向的碳元素含量始终低于X 、Y向, 这是由C/ C 复合材料的性质决定的。粘接接头的破坏形式, 是由常温的C/ C 复合材料破坏转变为200 ℃及其以上温度的胶粘剂内聚破坏的。C/ C 复合材料和胶粘剂表面碳、硅和氧元素变化表明: 当温度低于550 ℃ 时,C/ C 复合材料和胶粘剂的热分解速率相似; 当温度高于550 ℃时, 胶粘剂的热分解速率明显快于C/ C 复合材料。      

有机硅改性丙烯酸酯聚合物对环氧树脂胶粘剂性能的影响

采用有机硅改性丙烯酸酯聚合物改性环氧树脂,以聚酰胺为固化剂,研究了有机硅改性丙烯酸酯聚合物对环氧树脂黏度、粘接性能、固化行为、耐热性能和微观形貌的影响。黏度、剪切强度、差示扫描量热（DSC）、动态力学性能（DMA）和透射电镜（TEM）测试表明：有机硅改性丙烯酸酯聚合物与环氧树脂形成互穿网络结构,并且存在较多氢键,剪切强...     

Induced albumin secretion from HepG2 spheroids prepared using poly(ethylene glycol) derivative with oleyl groups

We developed a poly(ethylene glycol) (PEG) derivative with oleyl groups, so-called “cell adhesive”, for the promotion of human hepatocellular carcinoma HepG2 cell spheroids. Our approach was based on crosslinking of the cell membrane with a cell adhesive via a hydrophobic interaction. A cell adhesive, PEG derivative with hydrophobic oleyl groups at both ends was synthesized and characterized. HepG2 spheroids formed when the adhesive was added to cell suspensions. The size of the spheroids increased with time in culture. In addition, Ammonia elimination of HepG2 spheroid with cell adhesive was 3.4 times higher than that without cell adhesive. Furthermore, albumin secretion from HeG2 spheroids grown with the cell adhesive for 7 days was 3.3 times that from HepG2 spheroids grown without cell adhesive. Fluorescence microscopy showed greater albumin staining in spheroids grown with cell adhesive compared with spheroids grown without adhesive. This cell adhesive may be useful not only for single type of cells but also for multi types of cells to form artificial organs. This cell adhesive will be a key material for liver tissue engineering when it will apply to primary hepatocytes.     

Shear modulus estimation of the polymer polydimethylsiloxane (PDMS) using digital image correlation

Single lap joint under tensile load is used as a standard test specimen for characterizing adhesive properties and is considered the simplest form of adhesive joints. This paper presents an experimental investigation of full-field displacement in single lap adhesive joint. For the single lap joint specimen, steel adherends are bonded using a flexible rubber elastic polymer. The experimental procedure is carried out using the digital image correlation (DIC) method. This method consists of an optical-numerical experimental approach developed for full-field and non-contact measurements. The principal main is to describe a new testing methodology to analyze and estimate the adhesive shear modulus of polydimethylsiloxane (PDMS), which is a commercially available silicone elastic rubber.