Waterborne polyurethane is often used in the preparation of waterborne coatings because of its excellent film formation and adhesion, excellent flexibility and wear resistance.However, water-based polyurethane dispersion contains a lot of surfactant, easy to produce bubbles, and because of the special properties of water-based polyurethane, it is necessary to use the characteristics of water-based polyurethane defoaming agent for defoaming treatment.

Application scenarios of waterborne polyurethane defoaming agent

When we use waterborne polyurethane coating, by high-speed mixing and construction process of spraying brush and other operations, will cause the bubble; And the viscosity of waterborne polyurethane dispersion is low, usually 0.03-0.1 pa. s, which requires the use of thickening agent, and the use of thickening agent will make the bubble stable and not easy to eliminate.For the bubbles caused by the above factors, not only make the production operation difficult, hinder the dispersion of pigment in waterborne polyurethane, but also make the utilization rate of equipment is insufficient and affect the yield; Moreover, the bubbles left in the film during construction will affect the decorative effect and durability of the coating, so it is particularly important to give full play to the defoaming effect of water-based polyurethane defoaming agent.

In order to make waterborne polyurethane defoaming agent play its greater defoaming effect, we should not only know its use method, but also the amount of defoaming agent should pay special attention to, general high viscosity coating, due to defoaming difficulty, foam stability factors, so the amount will be slightly more, generally 0.3-1.0%.And the coating of low viscosity, for example water-soluble coating, as a result of containing the aid dissolvent of certain amount, can reduce dosage appropriately so, it is 0.01-0.2% can commonly.Other water-based coatings or resin coatings, generally about 0.1% at the same time we should pay attention to the amount is not the higher the better, too much will cause shrinkage shrinkage oil and other drawbacks, if the use of silicone defoaming agent dosage is too much, will also affect the recoating coating.Second is the method of adding, most of the water-based polyurethane defoaming agent can not be directly added to the diluted water-based coating, generally added when the viscosity of the coating is high.In addition, it shall be added in two times, once in the abrasive material and once in the film formation, and each stage shall be added in half.

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