蕲艾油微型胶囊制备研究

中草药有效成分的微型胶囊化是中成药开发的有效途径。采用单凝聚法和复凝聚法分别制备蕲艾油微型胶囊,实验表明,两种方法均可制得较理想的微型胶囊。     

蕲艾油微型胶囊制备研究

中草药有效成分的微型胶囊化是中成药开发的有效途径，采用单凝聚法和复凝聚法分别制备蕲艾油微型胶囊，实验表明，两种方法均可制得较理想的微型胶囊。     

环境友好型胶粘剂的研究进展

本文综述了近年来各种环境友好型胶粘剂的研究进展,并对生物质材料木材胶粘剂、氰酸酯胶粘剂、废聚苯乙烯泡沫塑料制备的无毒胶粘剂、魔芋胶胶粘剂、聚丙烯酸酯乳液型胶粘剂的性能和应用进行了全面讨论,展望了未来环境友好型胶粘剂的应用和发展前景.     

乳液型聚丙烯酸酯纸塑复合胶粘剂的研制与应用

介绍了以丙烯酸酯为主要原料的纸塑复合用乳液胶粘剂制备方法,探讨了单体的品种、用量和单体的加料方式对胶粘剂性能的影响规律;初步探讨了丙烯酸酯乳液碱增稠机理,提出了乳胶在体系中存在的结构模型。结果表明,该乳胶是一种低成本、稳定性好、制备工艺简单、应用前景很好的环保型新品种。     

木质素基木材胶粘剂的研究进展和应用现状

木质素胶粘剂是胶粘剂"绿色化学"的一个重要发展方向,论述了国内外木质素在木材胶粘剂中的制备和应用进展,为木质素胶粘剂的广泛应用和新用途的开发提供依据。     

生物质在木材胶粘剂中的研究进展

综述了胶粘剂行业的应用现状,详述了几种制备环保型木材胶粘剂用生物质资源(即淀粉、单宁、木质素和蛋白质)及其在木材胶粘剂中应用的研究进展。最后对生物质基木材胶粘剂的发展方向进行了展望。     

水性聚氨酯胶粘剂在复合薄膜制造上的应用

介绍了聚氨酯胶粘剂在复合薄膜制造上的应用,水性聚氨酯胶粘剂替代溶剂型聚氨酯胶粘剂做复合薄膜用胶的必然性,水性聚氨酯胶粘剂的特性、制备方法以及水性聚氨酯乳液应用于制备复合薄膜的不足之处以及改善方法。     

高固含量水性丙烯酸酯乳液制备及其作为胶粘剂应用进展

高固含量水性丙烯酸酯乳液作为胶粘剂可分为压敏胶粘剂、纸塑复合胶粘剂、塑木复合胶粘剂、木材胶粘剂、建筑胶粘剂、纺织胶粘剂、汽车胶粘剂等;介绍了水性丙烯酸酯乳液的制备及应用,展望了其应用前景与发展方向。     

锅炉控制系统中胶粘剂的应用分析

文章主要对锅炉控制系统中胶粘剂的应用进行了研究和分析,针对大型内衬陶瓷锅炉控制系统完成了专用胶粘剂的研制,在阐述了专用胶粘剂结构及性能的基础上,相比有机胶和硅溶胶,无机磷酸盐胶粘剂在耐高温、低固化收缩率等方面表现出了明显的优势,介绍了制备磷酸盐胶粘剂的原料及工艺,并通过试验制备出了一种高粘性的胶粘剂,试验的主要成分为磷酸二氢铝,结合使用适量的PH调节剂、缓蚀剂、增稠剂等完成了胶粘剂的制备,该胶粘剂表面干燥耗时不超过24h,耐温800℃,并降低了对金属表面的腐蚀,表现出了本文胶粘剂良好的技术经济优越性。     

内置胶囊自修复混凝土梁二次开裂模式研究

在内置胶囊自修复混凝土梁弯曲试验的基础上,通过对氰凝胶粘剂和聚氨酯胶粘剂两种梁二次开裂试验情况的分析,总结内置胶囊自修复混凝土梁二次开裂模式,最后得到了理想修复效果下的胶粘剂性能。     

过氧化苯甲酰微胶囊的制备与应用

以尿素、三聚氰胺和甲醛的预缩合物为壁材,过氧化苯甲酰为囊芯,采用原位聚合的方法制备了过氧化苯甲酰微胶囊。讨论了在过氧化苯甲酰微胶囊形成过程中不同种类的润湿分散剂及其用量、酸的加入速度等对微胶囊状态及粒径分布的影响,通过大量对比实验,得出制备过氧化苯甲酰微胶囊的最佳反应条件、适宜的分散剂及用量。同时,通过相关的胶黏剂配方试验表明,将制备的微胶囊应用于螺纹锁固厌氧胶中,取得良了好的效果,能够很好满足客户的技术要求。     

Synthesis of isocyanate microcapsules as functional crosslinking agent for wood adhesive

ABSTRACT

In this study, controlled-release isocyanate microcapsules were synthesized as functional crosslinking to slowdown the rate of cross-linking reactions. The isocyanate microcapsules were prepared by In-situ polymerization with polymethylene polyphenyl polyisocyanates (PAPI) as core and Urea formaldehyde resin as shell in oil-in-water emulsions. The particle size distribution, chemical structure, morphology, activity, and stability of the microcapsules were comprehensively characterized. Finally, the microcapsules were applied in a wood adhesive to prepare water-resistant plywood. The results showed that the size of the microcapsules was around 100 μm, the active content of NCO was about 23.5%, and the core content was approximately 80%. Compared with the stability of the bulk isocyanate, the stability of the isocyanate in microcapsules was significantly improved in the wood adhesive system. Furthermore, the isocyanate microcapsules showed highly efficient in plywood at different time, which indicated that isocyanate microcapsules could be controllable released in plywood applications.     

三氟化硼微胶囊热固化环氧树脂胶粘剂研究

介绍了三氟化硼微胶囊制备工艺与微囊性能。探讨了单组分三氟化硼微囊热固化环氧树脂胶粘剂的配比与制备工艺。研究了这种胶粘剂在常温下贮存稳定性和在固化温度下对不同材料的粘接工艺和效果。实验表明,该胶粘剂在常温下可稳定贮存３个月,对２５号碳钢的拉伸剪切强度达１６ＭＰａ。     

压敏型粘合剂用微胶囊的研制

原位聚合法制备以溶剂油为囊芯,尿素-三聚氰胺-甲醛树脂为囊壁的微胶囊,采用高剪切混合乳化机对芯材进行乳化,脲-甲醛量比2：1,先碱性后酸性的缩聚反应工艺,添加系统改性剂,得到粒径在10～20μm的占93%、包埋率较高、囊壁光滑致密的微胶囊。应用于制备压敏型微胶囊粘合剂,储存稳定,性能优越,使用方便。     

Preparation of imidazole embedded polyurea microcapsule for latent curing agent

The IZ-PU microcapsule-type curing agent was prepared by interfacial polymerization method. The shell-core structure of the IZ-PU microcapsules was demonstrated by IR and SEM. The core content and coating efficiency of the IZ-PU microcapsules were analyzed by DSC test of the one-component adhesive consisting of IZ-PU microcapsules and epoxy resin. The results showed that the IZ-PU microcapsules is a proper latent curing agent to epoxy resin, its latency at room temperature is longer than 30 days.     

The effects of Al surface treatment,adhesive thickness and microcapsule inclusion on the shear strength of bonded joints

The influences of various Al surface treatments, adhesive thicknesses as well as the incorporation of synthesized microcapsules into epoxy adhesive on the shear strength of adhesive/ Al joints have been investigated using lap-shear tensile tests. First, the influence of adhesive thickness on the shear strength of joints has been presented. Then, the effects of various Al surface treatments on the surface roughness of Al and shear strength of joint have been researched. Atomic force microscopy was used to study the Al surface morphologies and textures. Finally the few micron-sized polymeric microcapsules were synthesized and the shear performances of microcapsule filled epoxy adhesives were inspected. It was observed that the HCl acid based etching increased both micro-roughness and nano-texture of the Al surface and led to the peak shear strength. Moreover, HCl-nitric acid treatment offered the maximum value for the cohesive failure. Capsule inclusions into the adhesive displayed different influences on the joint shear performances depending on the capsule morphology and the surface treatment of Al.     

Photochromic performance optimization of polyurethane microcapsules by interfacial polymerization method

Spiropyran photochromic materials have been widely studied in military camouflage, optical data storage, information encryption, and fashion ornaments. The non-photochromism and low endurance of solid spiropyran make the challenges of their application. Photochromic microcapsules with a butyl acetate solution of spiropyran as core and polyurethane as shell are synthesized via interfacial polymerization. The optimized polyurethane photochromic microcapsules are prepared with a Tween 20 concentration of 4 wt%, core–shell ratio of 16:5, and spiropyran concentration of 0.40 wt%. Polyurethane photochromic microcapsules with a mean particle diameter of 0.33 μm are obtained. The morphology shows smooth spheres, and the core–shell structure is observed. Butyl acetate in the microcapsule core does not evaporate at a temperature lower than 218.01°C as the microcapsule shell insulates heat. The polyurethane photochromic microcapsules are mixed with adhesive, thickener, and water into a paste and screen-printed on cotton fabric. The printed fabric shows the ΔE of 17.56, 11.93, and 6.96 after 80s irradiation with the xenon lamp intensity of 102, 68, and 34 mW cm⁻². The light stability of the photochromic fabric is excellent as ΔE decreases about 8.28% after 20 cycles of UV-Vis irradiation.     

环氧树脂固化促进剂的微胶囊化及其应用

本文用原位聚合法制备了环氧树脂固化促进剂的徽胶囊,并在环氧胶带中使用。将非水溶性2-乙基-4-甲基咪唑(EMI)预反应物在水中分散,然后使三聚氰胺一甲醛预聚物在其表面原位聚合制取徽胶囊．测定了EMI预反应物在徽胶囊中的含量及其与制备过程中EMI与MF预聚物用量的关系。将此胶囊用于环氧胶带的制备。所得胶带储存性能和外观良好,且徽胶囊对胶带固化有较好促进作用。     

Influence of dual-component microcapsules on self-healing efficiency and performance of metal-epoxy composite-lap joints

Dual-component microcapsules were synthesized by solvent evaporation technique using epoxy resin and hardener as core materials and polymethyl methacrylate (PMMA) as shell wall materials. Morphology, core content, and size distribution of microcapsules were monitored by controlling the various processing parameters such as agitation speed, core–shell weight ratio, and concentration of emulsifiers. The molecular structure, morphologies, and thermal characteristics of the microcapsules were examined under Fourier transform infrared spectroscopy (FTIR), field emission scanning electron microscopy (FESEM), and thermogravimetric analysis (TGA), respectively. Synthesized dual-component microcapsules were entrenched into the epoxy polymer to introduce the healing features in single lap shear epoxy adhesive joints. Healing efficiency as high as 89% was achieved when 10 wt% dual-component microcapsules were introduced in adhesives. Investigation of the fractured surfaces of the healing enabled adhesives reveals the presence of crack pinning and crack blunting sites represented by characteristic tails at the wake of microcapsules in cohesive zone. Such failure mechanisms responsibly influence the healing efficiency.     

仿生黏附性聚多巴胺丁香酚抑菌微胶囊的制备

以丁香酚（EO）为芯材,多巴胺（DA）为壳材,通过乳液模板-界面聚合法成功制备出尺寸可控的聚多巴胺丁香酚（PDA@EO）微胶囊。通过FTIR、TG、UV-Vis、SEM和TEM对微胶囊的化学结构、形貌、粒径及性能进行表征和分析,结果表明,所制备的微胶囊呈规整球形,粒径在55～94 nm之间,丁香酚包封率为25.35%,包封量为0.6288 g/g,24 h时累积释放率达到68.39%。通过对比实验证明,PDA@EO微胶囊在不同材料表面均具有优异的黏附性能;作用于口腔感染部位常见细菌金黄色葡萄球菌和大肠杆菌24 h,PDA@EO微胶囊较游离丁香酚的抑菌活性分别提高了36.84%和35.52%;当微胶囊质量浓度达到2.0 g/L时,PDA@EO微胶囊对两种细菌的抑菌活性均达到99%以上。