Abstract
Hot-melt pressure-sensitive adhesive (HMPSA) is an environmentally benign adhesive which is typically processed without solvent in industries. However, casting solution method is commonly used for experimental purposes in the lab for convenience. Therefore, seven types of solvent with different polarities, including toluene as the most commonly used solvent, were investigated in this work to study the feasibilities. Quick bond strength and holding power were tested with different types of solvents and different adhesive weight percent in the prepared solutions. Through viscosity measurement, thermal analysis, and compositional analysis, the correlation between the chosen solvents and adhesive performance was further explored. It was found that the differences in the obtained bond strength of HMPSA treated with a variety of solvents were due to physical reasons instead of chemical reactions, and a solvent with similar polarity to toluene (e.g., tetrachloride, octane) should be considered as an option because a similar polymer chain relaxation could be maintained as the original HMPSA without solvent treatment. In this study, the mechanism of choosing toluene as common solvent for HMPSA testing was analyzed, and the feasibility of optional solvents was discussed.
Highlights
Pressure-sensitive adhesives (PSAs) are widely used in our daily life and a variety of industrial applications, which refer to a class of adhesives requiring a slight pressure to bond to a surface, such as self-adhesive tapes and labels [1]
Solvent-based PSAs are typically prepared with volatile organic compounds (VOCs) as solvent, and they rely on the remaining solid contents to adhere after evaporation of
The industrial processing of Hot-melt pressure-sensitive adhesive (HMPSA) have eliminated the usage of VOCs, so it is regarded as a newer generation of environmentally benign PSAs compared to the solvent-based ones
Summary
Pressure-sensitive adhesives (PSAs) are widely used in our daily life and a variety of industrial applications, which refer to a class of adhesives requiring a slight pressure to bond to a surface, such as self-adhesive tapes and labels [1]. Solvent-based PSAs are typically prepared with volatile organic compounds (VOCs) as solvent, and they rely on the remaining solid contents to adhere after evaporation of VOCs [3,4] In this case, a large amount of VOCs have to be dealt with during industrial processing leading to serious environment problems. The viscoelasticity of HMPSA is strictly temperature controlled It melts into liquid with low viscosity when temperature raises so that it is blended, transferred, and coated. It solidifies and displays high elasticity when temperature is brought back to room temperature so that it functions adhesion. The industrial processing of HMPSA have eliminated the usage of VOCs, so it is regarded as a newer generation of environmentally benign PSAs compared to the solvent-based ones
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