The influence of nanoparticles on the adhesion strength between epoxy resin and steel substrate
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Epoxy adhesive was modified by mechanical mixing with nanoparticles. Then the adhesion strength between metal and nano-modified epoxy adhesive was tested. The results of pull-off adhesion tests indicated that the adhesion strength of them showed different degrees of increase with the variety of nanoparticles' kind and content. Furthermore,the adhesion strength of steel substrate and epoxy adhesive added in 2% nano-Al2O3 was visibly improved by about 4 times. The mechanisms and reasons were analyzed and discussed by observing the joint's fracture morphology and testing the adhesion strength of the nano-modified system with different roughness of steel surface.Cite
Araldite
Bonding strength
Adhesive Bonding
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Post press processes include various types of bonding and adhesives, depending upon the nature of adherends, the end use performance requirements and the adhesive bonding processes. Polyvinyl acetate (PVAc) adhesive is a widely used adhesive in the graphic industry for paper, board, leather and cloth. In this study, the enhancement of PVAc adhesion performance by adding different concentrations (1%, 2% and 3%) of silica (SiO2) and titanium dioxide (TiO2) nanoparticles was investigated. The morphology of investigated paper-adhesive samples was analyzed by SEM microscopy and FTIR spectroscopy. In addition, the optimal adhesion at the interface of paper and adhesive was found according to calculated adhesion parameters by contact angle measurements (work of adhesion, surface free energy of interphase, wetting coefficient). According to obtained surface free energy (SFE) results, optimum nanoparticles concentration was 1%. The wettability of the paper-adhesive surface and low SFE of interphase turned out as a key for a good adhesion performance. The end use T-peel resistance test of adhesive joints confirmed enhancement of adhesion performance. The highest strength improvement was achieved with 1% of SiO2 nanoparticles in PVAc adhesive.
Polyvinyl acetate
Paint adhesion testing
Polyvinyl Alcohol
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The nano-particle modified epoxy resin adhesive was prepared by adding different types of nanoparticles to the epoxy resin adhesives.The influence of the kinds and amount of nanoparticles on the mechanical properties of epoxy resin adhesive was investigated.The investigation results indicated that the addition of three kinds of nanoparticles including nano-silica,nano-titanium dioxide,nano zinc oxide to epoxy resin adhesive has a significant influence on the mechanical properties of nano-composites.And tensile strength and breaking elongation of nano-composites reached the maximum when the amount of nanoparticle reached 4wt%.In addition,the toughening mechanisms of nano-particles modified epoxy resin adhesives was analysed.
Elongation
Composite epoxy material
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Diglycidyl ether
Shear Strength
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Tartaric acid were grafted onto the epoxy resin E-44,the modified epoxy resin were used to increase the adhesive forces between the epoxy coating and the steel.Compared with the results of FT-IR,TEM and AFM,it is found there were chemical bonding between the modified epoxy resin and steel.The results showed that the modified epoxy resin resulted in an increase in adhesion from 5.92 MPa to 24.14 MPa.
Composite epoxy material
Carbon fibers
Gelcoat
Tartaric acid
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This paper reports a study on the effect of Al 2 O 3 , SiO 2 and TiO 2 nanoparticles on the adhesion strength of steel joints bonded with two-part structural acrylic adhesives. Introduction of the nanoparticles in the two-part acrylic adhesive led to a remarkable enhancement in both the shear and the tensile strength of the steel joints. Addition of the nanoparticles caused an increase in the shear and the tensile strength of the joints; however, a reduction was observed in the peel strength of the joints. Differential scanning calorimeter analysis revealed that glass transition temperature values of the adhesives rose with the addition of the nanofillers. The water contact angle was decreased for adhesives containing nanoparticles. Scanning electron microscope images revealed that the addition of the nanoparticles altered the fracture morphology from smooth to rough fracture surfaces.
Acrylic resin
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This paper reports a study on the effect of silicon carbide nanoparticles on the adhesion strength of steel–glass/epoxy composite joints bonded with two-part structural acrylic adhesives. The introduction of nanosilicon carbide in the two-part acrylic adhesive led to a remarkable enhancement in the shear and tensile strength of the composite joints. The shear and tensile strengths of the adhesive joints increased with adding the filler content up to 1.5 wt%, after which decreased with adding more filler content. Also, addition of nanoparticles caused a reduction in the peel strength of the joints. DSC analysis revealed that Tg values of the adhesives rose with increase in the nanofiller content. The equilibrium water contact angle was decreased for adhesives containing nanoparticles. SEM micrographs revealed that addition of nanoparticles altered the fracture morphology from smooth to rough fracture surfaces.
Shear Strength
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Epoxy resins are a very common type of adhesive materials in several fields like the automotive industry, marine, probably the most important is in the aerospace industry. Adhesive joints of carbon fiber reinforced epoxy composite laminates are worked using an epoxy resin as the adhesive. In this paper, Adhesive joints were modified nano-CaCO3 in order to enhance the shear strength of epoxy adhesives. The enhancements of shear strength of epoxy adhesive joints reinforced with different nano-CaCO3 particles loading have been studied. The adhesive properties were measured by tensile lap shear test as a function of nano-CaCO3 amount and damaged adhesive surface roughness. Also, the fracture surfaces were examined with Scanning Electron Microscopy (SEM).
Shear Strength
Direct shear test
Composite epoxy material
Lap joint
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ポリエチレン被覆鋼材のエポキシプライマー (アミン硬化系) 中のエポキシ基濃度が, 一次, 二次密着性に及ぼす影響を調べた。アミン系硬化剤をエポキシ当量から計算される当量配合した場合には, 樹脂系により異なる挙動をとったが, 2.8～3.8molkg-1のエポキシ基濃度範囲で, エポキシ基濃度の増加とともに接着強度, 2次密着性が向上する傾向を示した。アミン硬化剤の配合量を意図的に当量配合からずらしエポキシ濃度を変えた場合では, エポキシ基濃度の高い方が, 2.8～3.8molkg-1のエポキシ基濃度範囲で単調に一次, 二次密着性が向上した。見かけの破壊面は, エポキシプライマーと接着性ポリエチレン層間で, この部分の接着特性がエポキシ基と接着性ポリエチレンに変成されている無水マレイン酸の相互作用に大きく依存していると推定した。硬化剤配合量を減らして, 被覆特性の向上をはかる場合には, 90度剥離強度の温度依存性, 温塩水浸漬後の接着強度比率などから-20%以内にとどめるのがよい。以上から優れた密着性能を得るためには, エポキシプライマーのエポキシ樹脂としてエポキシ濃度の高いものを選択し, 硬化剤配合量を-20%程度, 当量配合から減じることが必要である。
Primer (cosmetics)
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