Introduction of waterborne polyurethane antifoam

Due to the diversity of raw materials and formulas, the preparation methods of waterborne polyurethane are becoming more and more abundant, and the common ones are self-emulsification method and external emulsification method, prepolymer method, melt dispersion method, etc. No matter what kind of method is used, because waterborne polyurethane is based on water as a solvent, the viscosity is generally adjusted by a water-soluble thickener and water with foam stability, coupled with the influence of external forces such as stirring, it is easy to form a large amount of foam and accumulate during the preparation process, slowing down the process process.

For this reason, we can choose to add the right amount of waterborne polyurethane defoamer to easily deal with the foaming problem. So, what are the uses, usages and scenarios of waterborne polyurethane defoamers?

First, the use of waterborne polyurethane defoamer

Waterborne polyurethane defoamer is mainly used in waterborne polyurethane coatings, printing inks and other fields, which can well eliminate the foam in waterborne polyurethane and improve product quality and production efficiency. At the same time, the defoamer is environmentally friendly and meets environmental protection requirements, which increases the social image and market competitiveness of the enterprise.

Second, the use of waterborne polyurethane defoamer

1. Direct addition: Waterborne polyurethane defoamer is added directly to the waterborne polyurethane system, which usually needs to be added during the mixing process.

2. Pre-disperse addition: The waterborne polyurethane defoamer is pre-mixed with a certain amount of solvent or water to form a homogeneous suspension, and then the suspension is added to the waterborne polyurethane system.

3. Dissolution addition: The waterborne polyurethane defoamer is dissolved in a solvent or water, and then the dissolved liquid is added to the waterborne polyurethane system.

4. Extrusion method: the waterborne polyurethane system is extruded through the extruder, and then the waterborne polyurethane defoamer is sprayed at the extrusion outlet. In this way, the waterborne polyurethane defoamer can be sprayed directly into the waterborne polyurethane system, and the defoaming effect is better.

5. Sedimentation method: The waterborne polyurethane system is left to stand for a period of time to allow the foam to float naturally, and then the surface is sprayed with waterborne polyurethane defoamer. This method is suitable for smaller production batches and can reduce the amount of waterborne polyurethane antifoam used.
Third, the use of waterborne polyurethane defoamer

1. Construction field: waterborne polyurethane defoamer is suitable for waterborne polyurethane waterproof coatings, heat insulation coatings and other fields.

2. Coating field: waterborne polyurethane defoamer is suitable for waterborne polyurethane coatings, wood coatings and other fields.

3. Printing field: waterborne polyurethane defoamer is suitable for waterborne polyurethane ink, UV ink and other fields.