Polyurethane coating and preparation method therof

Abstract

The invention belongs to the field of materials, and particularly discloses a polyurethane coating. The polyurethane coating comprises a component A and a component B; the component A comprises the following components in parts by weight: 40-65 parts of aqueous acrylic resin, 10-30 parts of a solvent, 3-25 parts of pigment, 5-20 parts of a coalescing agent, 1-5 parts of a dispersing agent, 0.1-0.5part of a wetting agent, 0.1-0.3 part of a defoaming agent and 0.1-0.5 part of an alkanolamine compound; and the component B is a curing agent containing an isocyanate and / or an isocyanate derivative. According to the polyurethane coating, the surface drying time of the coating can be adjusted, the reaction speed of the coating is high at 40-70 DEG C, and film formation is uniform. The polyurethane coating cannot be immediately aggregated on the surface of an object at a temperature of 40-70 DEG C to cause uneven dispersion and form particles, and the problems that the polyurethane coating isnot dried completely at a temperature of 40-70, still has high viscosity on the surface, and easily sticks to packages can be solved.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a polyurethane coating and a preparation method thereof. Background technique [0002] Jack refers to the hoisting equipment that uses a rigid jacking part as a working device to jack up a heavy object in a small stroke of a top bracket or a bottom claw. The jack is mainly used in factories, mines, transportation and other departments as vehicle repair and other lifting, support and other work. [0003] Due to its high efficiency and convenient use, Omega rotary disc electrostatic coating is widely used in the coating of jacks. Due to the heavy weight of the jack workpiece itself, the heat dissipation is slow. During the painting and production of the jack, the temperature of the jack body after pretreatment has not yet dropped to normal temperature, and it is difficult to drop to normal temperature. The low is 40°C and the high can reach 60°C. Therefore, in the actual process, it is e...

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Problems solved by technology

Therefore, in the actual process, it is easy to dry and form particles immediately after the paint is sprayed; and after baking, the jack body will also have a higher temperature when the jack is off the assembly line for packaging. The phenomenon of sticking packaging

However, jacks have very high requirements on the appearance and performance of surface coatings. Most of them require high gloss and high fullness. Therefore, most jack coating manufacturers still use traditional solvent-based two-component polyurethane coatings for coating. Its VOC (volatile organic compound) emission is high

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