Defoamers for water-based shoe paints are primarily used to address foaming issues during the production, application, and drying processes of water-based shoe paints, ensuring the smoothness and performance of the shoe coating.

I. Core Application Scenarios

Paint Preparation

When stirring and dispersing pigments or fillers in water-based shoe paints, air is easily entrained, forming a large number of bubbles. Adding a defoamer during this stage quickly eliminates existing bubbles while inhibiting the formation of new ones, preventing uneven distribution of paint components due to bubbles.

Shoe Coating

When brushing, spraying, or rolling water-based paint onto shoe materials (such as PU, TPU, and canvas substrates), bubbles are easily generated during the paint's flow. Defoamers ensure that bubbles are eliminated before the coating cures, preventing surface defects such as pinholes and pitting.

Coating Drying and Curing

When some water-based paints dry, evaporation of water may cause trapped bubbles to rise. Defoamers continue to work during the curing process, preventing dents left by bursting bubbles and ensuring a smooth and glossy coating.

II. Main Functions

Bubbling: Quickly eliminates existing bubbles in the paint, reducing surface imperfections.

Suppressing Foaming: Prevents air from entering or releasing gases from the paint during storage and application, thereby preventing new bubbles.

Improving Appearance: Ensures a smooth, pinhole-free coating on the shoe material, enhancing the visual quality and product quality.

Improving Performance: Prevents bubbles from causing problems such as decreased adhesion and abrasion resistance, thereby extending the lifespan of the shoe material.

III. Usage Precautions

Controlling the Addition Amount: The typical addition amount is 0.1%-0.5% of the total water-based shoe paint volume. Excessive addition may cause craters and gloss loss in the coating.

Choosing the Suitable Type: Select a defoamer with good compatibility based on the paint's resin system (e.g., acrylic, polyurethane) to avoid delamination and precipitation.

Proper Mixing Method: Add the defoamer slowly while stirring the paint to ensure even dispersion and avoid excessive concentration in certain areas. Compatibility test: Before use, a small batch of defoamer should be tested for compatibility with the paint, as well as its effect on the color and gloss of the coating.