Abstract
This research has studied the feasibility of fabricating a catalyst that activates at 80 °C to ensure the curing performance of two-pack isocyanate curable paints, while remaining inactive at 40 °C to ensure storage stability and pot life. The research examined whether the added dibutyl tin dilaurate (DBTL) provided a catalytic function for curing the waterborne paint, which remains almost inactive at 40 °C and activates at 80 °C or higher. It was confirmed that the use of a non-ionic surfactant with a hydrophilic-lipophilic-balance (HLB) of between 13 and 14 resulted in rapid curing at a temperature of 80 °C or higher, thereby demonstrating catalytic properties. The results also show that the viscosity of the paint remained virtually unchanged after exposure for 1 h at 40 °C. This wass presumed to be the result of the DBTL, which was constrained by the micelles up to a temperature of 70 °C, breaking down the micelles at a temperature of 80 °C or higher. It was also confirmed that the catalytic switching properties were not obtained at a lower or higher HLB. It was found that selecting the non-ionic surfactant by HLB can control the activating temperature of the catalytic properties.
Highlights
Resins used for automotive body paints consist of acrylic polymers containing mainly hydroxyl groups, to ensure paint film performance, and a curing agent such as isocyanate groups or melamine resins
Aqueous solutions consisting of DBTL added to non-ionic surfactant micelles were prepared and added to isocyanate curable waterborne paints
This research examined whether the added DBTL provided a switchable catalytic function for curing the waterborne paint that activates at 80 ◦C or higher
Summary
Resins used for automotive body paints consist of acrylic polymers containing mainly hydroxyl groups, to ensure paint film performance, and a curing agent such as isocyanate groups or melamine resins. Other research is examining the feasibility of partially adopting plastic outer panels to reduce vehicle weight [3] This would require the application of integrated painting and baking processes to steel body panels and plastic bumpers to lower costs and facilitate color matching between the body and bumpers [4]. It has been proposed that blending an isocyanate curing agent with a certain amount of a Coatings 2021, 11, 375 layer of the paint film is a curable paint that mainly uses acrylic polyols and isocyanates [6].
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