High-solid, low-viscosity waterborne polyurethane: based on multiparticle size composite emulsification

2024年03月15日14:50 来源：无

Research shows that emulsions with specific particle size ratios achieve convincing results in terms of solids content, viscosity, tensile strength and adhesive strength. Source: Adobe.Stock

In a current research, waterborne polyurethane (WPU-SL) with high solid content and low viscosity was successfully prepared by compounding large particle size emulsion (WPU-L) with a variety of small particle size emulsions (WPU-S) by investigating the effects of small particle size type, particle size ratio, and volume ratio on the emulsion properties. A series of characterization techniques of the waterborne polyurethane was carried out by FTIR, DSC, contact angle, viscometer, particle size meter, and universal testing machine.

The results show that the WPU-L/WPU-S？=？5/1 emulsion has a high solid content, good emulsion stability, and excellent coating film properties. When WPU-S1 and WPU-S3, two small particle size emulsions with a particle size ratio of 2.45 and 3.79, were emulsified with WPU-L, the solid content was up to 61.23%, the viscosity was only 342 mPa s, the tensile strength reached 20.97 MPa, and the adhesion grade was 5B, which was the most excellent overall performance, showing satisfactory results.

The reserach has been published in Journal of Coatings Technology and Research in December 2023.

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