粘接低表面能材料时α-氰基丙烯酸酯胶粘剂用底胶的研究

研究了底胶在α-氰基丙烯酸酯胶粘剂粘接低表面能材料时的作用。底胶中三苯基膦、添加剂N99可以大幅提高低表面能材料与α-氰基丙烯酸乙酯胶之间的粘接强度。     

聚氨酯水分散体改性丙烯酸胶粘剂的性能

用聚氨酯改性的丙烯酸材料是近年来开发应用的一种新型材料,这种改性材料在涂料、油墨和胶粘剂等领域广泛应用。丙烯酸乳液具有和高弹性聚合物掺和性能好的特点。聚氨酯属高弹性聚合物类,它添加到丙烯酸乳液中去,能改进丙烯酸乳液的粘接、柔韧和延伸性能,且不使丙烯酸胶粘剂本身的特点受到影响。聚氨酯水分散体改性的丙烯酸树脂胶粘剂既能提高其粘接强度,又具有色     

瓦克化学投资南京（EVA）胶粉项目

英国新材料公司Oxford Advanced Surfaces Group Plc（OAS）日前宣布：已经开发出一种能使各种工业环氧树脂（EP）胶粘剂获得超强粘附力的新技术。在某些EP胶粘剂无法达到满意效果的领域,Onlo增黏剂可以起到增强EP胶粘剂与聚酰亚胺和PET聚合物等材料的粘接作用。EP胶粘剂具有高强度和耐各种恶劣环境等特点,是一种应用最为广泛的工业结构胶;但是,EP胶粘剂用于惰性材料和低表面能材料的粘接日寸,其效果不太理想,必须通过各种表面处理方式加以改进。Onto增黏剂可将某些特定材料与EP胶粘剂结合起来,即使这些材料本身与EP胶粘剂难以粘接,或者使用了更复杂、更昂贵且对EP体系具有排斥性的胶粘剂。在实际应用过程中,Onto增黏剂的厚度在几纳米到几微米之间,     

EM型吸油性胶粘剂的配制和性能研究

一、前言胶粘剂品种繁多.其中包括最近引起较大注意的吸油性胶粘剂.在沾油的材料表面涂上胶粘剂,胶粘剂扩散穿透油膜并且混合吸收,胶粘剂对材料表面仍能充分浸润铺展,固化后具有足够的粘接强度,这类胶粘剂称为吸油性胶粘剂(Oil Absorbent Adhesives,简称油面胶).金属材料特别是钢材可以在其表面有防锈油、压力加工油等情况下使用吸油性胶粘剂照样进行粘接,从而节省了溶剂脱脂和表面处理的时间和费用,并且减少操     

用气体等离子体去污改善印刷线路板的粘接

粘接取决于被粘接表面的类型、所使用的胶粘剂或密封剂的种类及表面清洁的程度。例如:镀锡、电镀、或镀金表面比能形成氧化物的金属表面更难粘接;表面张力低的塑料比那些表面张力高的塑料更难粘接。此外,塑料基底和胶粘剂或密封剂之间溶解     

适宜粘接难粘金属和非金属材料的环氧胶

环氧胶粘剂主要用于金属材料的粘接,而对于钛合金等难粘材料而言,若不经过特殊的表面处理,则粘接强度很低,对于多数非金属材料的粘接性能也很差。虽然很多非金属材料粘接大都采用聚氨酯（PU）胶粘剂,可因PU胶固化时有低分子物放出,对粘接性能影响很大,同时耐热性也不尽人意。尽管近年来国外研制出能用于金属和非金属材料粘接的环氧胶粘剂（如日本的EP001）,而国内尚无类似产品。     

引发剂用有机硼胺络合物的研究进展

在总结有机硼胺络合物引发体系的国内外发展现状的基础上，介绍了其合成理论、合成方法和在牙科及粘接低表面能材料的胶粘剂中的应用。     

国产聚氨酯胶粘剂在低极性鞋材上的应用

采用自帛的表面处理剂对鞋材表面进行底涂，使得低极性热塑性弹性体等鞋材与聚氨酯胶粘剂的粘接力明显,敢国产聚氨酯胶粘剂对低极性鞋用材料粘合不牢的问题。获得了较为满意的效果。     

复塑纸盒高速封口胶的研制

聚烯烃具有低的表面能，对于未处理聚烯烃表面的粘接，采用普通的胶粘剂，通常难以得到良好的效果。研制了一种复合型的乳液胶粘剂，通过对乳液组分配比的调整及增粘树脂的选择，得到了优异的粘接性。经验证，该胶粘剂在对BOPP复膜的纸盒进行高速封口粘接时，经过一段时间的固化，可达到满意的效果。     

美发明加香型医用胶粘剂

由于PE、PP等聚烯烃材料具有表面能低、结晶度高、无极性或极性很弱等优点，粘附性能很差。为提高其粘接性能，通常有两种途径：一是进行表面处理；二是提高胶粘剂的粘接能力。聚烯烃的表面处理方法很多，主要有化学试剂处理法、火焰处理法、电晕处理法及等离子体处理法等，这些表面处理技术会增加工序和生产成本。因此，研究和开发理想的聚烯烃用胶粘剂才是最重要的。     

油墨用热塑性聚氨酯弹性体的研制

使用不结晶型的聚酯多元醇、扩链剂和异佛尔酮二异氰酸酯(IPDI)为主要原料,通过一步法反应制备出具有耐黄变、高光泽度、对低表面能材质有较高粘接强度的油墨用热塑性聚氨酯弹性体(TPU)。研究了聚酯多元醇、扩链剂种类和用量、催化剂种类和R值[n(-NCO)/n(-OH)]对TPU性能的影响,并对各种材质的粘接强度进行了测试。实验结果表明,当采用平均相对分子质量为1 500～2 000的自制聚酯多元醇、以氯化亚锡为催化剂、1,4-环己二甲醇(CHDM)为扩链剂且n(CHDM)∶n(聚酯多元醇)=0.5∶1、R=1.00～1.01时,制得的TPU对PET、PP和PE等低表面能材质具有良好的粘接性能。     

聚硅氧烷-丙烯酸酯共聚物互改性产物的表面特性

通过测定参照液体在固体表面的接触角，计算固体的表面能及固体／液体接触体系的粘附功，考查了聚硅氧烷-丙烯酸酯共聚物互改性产物的表面特性及其对粘接性能影响。     

Plasma Surface Treatment of Aerospace Materials for Enhanced Adhesive Bonding

The increased use of polyphenylene sulphide (PPS) and polyetheretherketone based composites for aircraft structures has highlighted the need for reliable methods of bonding these materials to metallic components such as titanium. Both composite and titanium adhesive bonds exhibit poor long-term durability when exposed to hot/wet conditions, aerospace fluids and solvents. As a result, surface treatments are employed to enhance surface energy, surface roughness and alter surface chemistry to provide better long-term durability. In this initial study the adhesive bonding of glass fibre reinforced GFR-PPS and commercially pure titanium was investigated. Prior to bonding, both materials were plasma treated using argon and oxygen gases in a RF discharge. Surface characterisation was carried out to optimise these treatments. Surface energy and wettability were examined using contact angle analysis, surface roughness was examined using scanning electron microscopy and atomic force microscopy, while X-ray photo-electron spectroscopy (XPS) was employed to study the surface chemistry. Bond strengths were determined using lap shear tests. Initial results reveal that these optimum plasma treatments produce a significant increase in bond strength.     

Plasma Surface Treatment of Aerospace Materials for Enhanced Adhesive Bonding

The increased use of polyphenylene sulphide (PPS) and polyetheretherketone based composites for aircraft structures has highlighted the need for reliable methods of bonding these materials to metallic components such as titanium. Both composite and titanium adhesive bonds exhibit poor long-term durability when exposed to hot/wet conditions, aerospace fluids and solvents. As a result, surface treatments are employed to enhance surface energy, surface roughness and alter surface chemistry to provide better long-term durability. In this initial study the adhesive bonding of glass fibre reinforced GFR-PPS and commercially pure titanium was investigated. Prior to bonding, both materials were plasma treated using argon and oxygen gases in a RF discharge. Surface characterisation was carried out to optimise these treatments. Surface energy and wettability were examined using contact angle analysis, surface roughness was examined using scanning electron microscopy and atomic force microscopy, while X-ray photo-electron spectroscopy (XPS) was employed to study the surface chemistry. Bond strengths were determined using lap shear tests. Initial results reveal that these optimum plasma treatments produce a significant increase in bond strength.     

EVA改进聚醋酸乙烯乳液粘合剂性能的研究

本研究采用EVA乳液作为种子进行聚合制备改性聚醋酸乙烯乳液粘合剂。讨论了EVA乳液的用量对聚合物的耐寒性、表面张力的影响。同时,对聚合温度、搅拌速度、引发剂用量、聚合保温时间等进行了选择。改性后的白胶粘合剂具有多次循环的冻融稳定性,且对低表面能材料的粘接强度明显高于通用白胶     

Preparation and properties of poly(siloxane‐ether‐urethane)‐acrylic hybrid emulsions

Poly(siloxane‐ether‐urethane)‐acrylic (PU‐AC) hybrid emulsions were prepared by introducing different hydroxyethoxypropyl‐terminated polydimethylsiloxane (PDMS) content into the acrylic‐terminated poly(ether‐urethane) backbone and then in situ copolymerizing with methyl methacrylate and butyl acrylate via emulsion process. The effects of PDMS on the particle size and viscoelastic behavior of the hybrid emulsions were investigated. Meanwhile, the hydrogen bonding, mechanical and thermal mechanical properties, water resistance, the surface gloss, and wettability of the resultant hybrid films were also studied. The results showed that all the hybrid emulsions showed shear‐thinning behaviors, and the introduction of PDMS resulted in the formation of the hybrid emulsions with increased average particle size and decreased viscosity. The chemical bonds built between PU and AC yielded higher than 73% crosslinking fraction in all the hybrid materials, but this value decreased with increasing PDMS content because PDMS reduced the hydrogen bonding interactions and enhanced the phase separation. As a result, an increase in the PDMS content led to an increase in the elongation, water resistance, surface roughness, and water hydrophobic of the films, but the tensile strength, hardness, storage modulus, and glass transitions temperature decreased. It is suggested that introduction of PDMS can provide the hybrid materials with the improved flexibility, water resistance, and surface hydrophobicity, which has potential application value in the fouling‐release coatings, biomaterials, and surface fishing. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 44927.     

激光处理对CFRP与铝胶接性能的研究

碳纤维增强复合材料(CFRP)具有轻质高强的特点,被广泛应用于汽车、航空航天、建筑等领域。但CFRP表面惰性高,使得CFRP与其他异质材料复合时的胶接强度低,不能满足使用。采用激光(光纤激光器)对CFRP进行表面处理后,再与铝进行胶接测试。利用SEM、接触角测试和光学轮廓仪测试对不同脉宽的激光处理后的CFRP表面形貌、表面能、表面粗糙度进行研究。结果表明,随脉宽增加,处理后的CFRP表面树脂残留量减少,表面粗糙度增加,表面自由能也相应增加。对比激光处理与机械打磨两种方式与铝的胶接性能发现,激光处理的CFRP与铝的胶接强度比未处理提高了1.95倍,比打磨处理提高了1.02倍。对其胶接断面进行分析可知,激光处理试样的断裂模式主要为纤维撕裂破坏。     

乳液型丙烯酸酯压敏胶研究进展

针对乳液型丙烯酸酯PSA(压敏胶)的耐水性较差、耐高温性欠佳及涂布干燥速率较慢等弊病,综述了乳液型丙烯酸酯PSA的最新研究方向及进展(包括高固含量乳液型丙烯酸酯PSA、乳液型交联丙烯酸酯PSA、低表面能材料粘接用乳液型丙烯酸酯PSA和耐水性乳液型丙烯酸酯PSA等);最后对其应用前景进行了展望。