Dry and Wet Adhesion

This test determines the adhesion of the finish coat to the leather surface. It also provides evidence of possible inter-adhesion problems within the finish coat These arise in particular when excessive atudliary quantities (especially waxes) are used or the crosslinking of the preceding layer is excessive. Ideally, the adhesion of the finish to the leather is such that, in this test, the finish can only be pulled off together with the grain layer. 

To test the wet adhesion, the adhered specimens are immersed in water and tested after a predetermined time. 

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It was also found that the lignin-resol resin adhesives satisfied the JIS requirements for non-volatile content, pH value, viscosity, gel time, and dry and wet adhesion strength. Furthermore, the low temperature curability typically found in amino resin adhesives could also be achieved. Thus, it can be concluded that an effective utilization of lignin is possible with simultaneous improvement of the properties of resol resin adhesives. 

The softening behavior has also been observed with Cytec EM 1000-Al single lap joints exposed to 100% relative humidity at 50°C for 1000 hours [91]. As shown in Fig. 8, wet and dry joints exhibited similar strength-temperature relationships, but with the former being shifted to a lower temperature by 30-50°C, a quantity close to the water-induced depression of the Tg. Hence, in this case, the Tg depression acts as a shift factor that defines the strength-temperature relationship between the dry and wet adhesive so that at a given temperature, a wet joint exhibits lower strength than a dry one. 

However, this represents just 0.006% of all oil consumed per annum even if this amount has been doubled by factoring in the material and energy needs for processing the base ingredients for adhesives and sealants, and also taking into account the difference between dry and wet adhesives as representing on average a factor of 3. 

Coefficient of variation for dust (dry assay) and dust (wet assay) was 8.5 and 8.7%, respectively. The range of trash contents is about 50 compared to about four for dust content. As explained by Montalvo (12). differences in dust content by the dry and wet assay methods are a result of a geometry effect associated with the former technique and the variation of adhesion force of dust on cotton with environment. Only one airborne dust measurement was taken on five of the six cottons. 

The third technique described by Yanazawa et al, (12) is based upon calculating the thermodynamic work of adhesion V., between the dry photoresist and the substrate (SIO-, 3 4 with and without various surface treatments) and W based upon the penetration of the liquid, e.g., water, as shown in Figure 5. They used water as the liquid because they used positive photoresists in their study and an aqueous medium is used as the developer for such resists. Based upon the concept of In the dry and wet st e, they defined wet adhesion factor, f st as f W.(wet)/W,(dry). Subsequently they correlated... 

Conversion layers lead to an increased adhesion strength of organic coatings on metals xmder dry and wet conditions. In addition, the kinetics of ion and electron transfer processes at the metal-polymer interface are slowed down. In case of iron and zinc, especially the oxygen reduction rate, which strongly influences the delamination kinetics of the coating, is reduced. 

A.D. Loguerio, F. Loeblein, T. Cherobin, F. Ogliari, E. Piva, A. Reiss, Effect of solvent removal on adhesive properties of simplified etch-and-rinse systems and on bond strengths to dry and wet dentin, J. Adhes. Dent. 11 (2009) 213-219. 

Uses Styrene-acr ic for water-based flexo/gravure printing inks onto polyolefin films, foils, paper, low-VOC printing inks and OPVs Features Let-down resin exc. adhesion to polyolefins clear and transparent good dry and wet rub resistance fast film formation and good wetting good antislip props. 

Table 3 summarizes the Analysis of Variance (ANOVA) results for the effects of treatment (untreated and treated), veneer layer and adhesive spread amount. The results show that there were highly significant interactions between these three variables in terms of Modulus of Rupture (MOR) and Modulus of Elasticity (MOE) of OPS plywood. However, it was also observed that the effect of adhesive spread amount was only moderately significant on the bond integrity of OPS plywood in terms both dry and wet shear strengths. 

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