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Tianchang green chemical auxiliary reagent factory of Anhui


Tianchang City, xinHebei Road, New Park Street on the 10th
Phone: 0550-7027028  
Fax: 0550-7024034
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Silane coupling agent for glass and aluminum bonding durability
1 with the introduction of silane coupling agent of organic - inorganic hybrid structure, to improve the adhesive and adhesion between the surface. The earliest development of silane coupling agent is used to improve in the glass fiber composite materials with epoxy matrix bonding between. In recent years, will silane for aluminum and glass structure bonding to replace other harmful to the environment or expensive surface treatment, attracted attention. This article from the perspective of focusing on the practical application of silane coupling agent to deal with glass and aluminum surface on the impact of the durability of adhesives.

Experimental part 2

2.1 coupling agent used in the glass surface in experiments with three aminopropyl triethoxysilane (APES) and glycidylpropyltrimethoxy silane (GPMS) as a coupling agent, through the mixing of adhesive coupling agent solution or coating applied to glass surface. Glass sample after washing with distilled water 50 ℃, 1h drying, and then to different concentrations of coupling agent solution Baptist 30min, coupling the mass fraction of 0.1% ~ 5%. 120 ℃ and then drying in 1h. With the coating method of comparison, the coupling agent directly mixed in the adhesive, the mass fraction of 0.1% ~ 5%. Float glass in the face of tin tin surface adhesive, glass specimen tin bath surface and air surface under ultra-violet light can be distinguished. Bonding area of 20mm × 5mm, layer thickness of 0.2mm. Room temperature curing conditions for 24h → 120 ℃, 1h. All adhesive samples containing 0.15% anionic surfactant in the distilled water immersion in 40 ℃ under 28d. After soaking the test piece in the general test machine measured shear strength, rate of pressure head 5mm min-1.

2.2 silane coupling agent used in aluminum surface in the application of silane coupling agent APES and GPMS ago, the aluminum substrate to different methods of pre-treatment (see table 1). 0.5% coupling agent in aqueous solution through immersion will be applied to substrate coupling. Samples in 40 ℃, 30min drying. For bisphenol A epoxy adhesive - Diethylenetriamine system. Single-lap specimen at 70 ℃ deionized water were determined after 42d Baptist pull-shear strength, speed chuck 10mm min-1.
3 Results and Discussion

3.1 coupling agent on bonding of glass affect the test results are shown in figure 1 ~ 3. Figure 1 and Figure 2 shows the silane content on the adhesive strength and durability. Figure 3 illustrates the non-functional silanes impact. Experiment using APES and GPMS. If silane directly mixed in resin, APES is better than the GPMS (Figure 1). This may be due to accelerated adhesive alkaline amino silanes condensation. In contrast, for example glass surface pretreatment, GPMS better than the results of APES (Figure 2).
Can be seen from Figure 2, joint strength with the coupling agent content and changes in the mass fraction of 0.5 percent when the maximum intensity of 14MPa. Direct mixing has been different results (see Figure 1). Mass fraction from 0.1% to 1% of the joint strength increased rapidly. The durability of the glass bonding has been greatly improved: 40 ℃, 28d after the aging test joint strength up to 15MPa, than the specimen without coupling agent high 1 times. These test results show that the silane improved durability. Mixed with the adhesive silane need more to achieve the maximum bonding strength. Non-functional group of silane for surface treatment of the results show that not only improved the silane and the substrate bonding, and the glass surface to prevent corrosion.

3.2 silanes on the impact of aluminum bonding Fig.4 note aminopropyl triethoxysilane three aluminum degreasing solvent used in the surface, the initial bond strength and long-term strength after aging have not improved.

Compared with the solvent debinding, lye cleaned aluminum surface with the same silane coupling agent treatment, whether it is the initial bonding strength, or in high-temperature deionized water soaking after a long-term strength have improved (see Figure 5). APES also can improve the sand blasting aluminum specimen of shear strength, which has the effect of epoxy GPMS the more significant (see Figure 5). It shows the aluminum surface in an appropriate chemical or mechanical methods to deal with a further application before the importance of coupling agent.

4 Conclusion number of coupling agent to achieve the maximum intensity. (2) for aluminum bonding, by alkali treatment and sand blasting of aluminum, coupling agent can improve its durability, and GPMS more significant effect than the APES, and the only solvent debinding treatment, no influence.