Abstract
A series of high solid content carboxylic acid/sulfonic acid waterborne polyurethanes was prepared by the emulsion dispersion method. The particle size and solid content were measured. By changing the particle size of the large particles to achieve different particle size ratios, high solid content waterborne polyurethanes were obtained at specific particle size ratios. When the particle size ratio was >7, 4–5 or 2–3, the aqueous polyurethane could reach a higher solid content (more than 56%). This indicated that solid content is related to particle size distribution in high solid content waterborne polyurethane. Moreover, the corresponding three-dimensional stacked models (simple cubic accumulation, face-centered cubic accumulation, cubic close packing and hexagonal closest packing) were established.
Highlights
With the improvement of environmental protection requirements and the successive introduction of environmental protection policies in various countries, water-based polyurethanes (WPU) have been widely used because they use water as a solvent, are non-polluting, safe and reliable, and have good mechanical properties and good compatibility [1,2,3,4,5,6]
We found that the solid content varied with the particle size ratio
56%), and we established a physical model to study the relationship between the content, and we established a physical model to study the relationship between the particle size ratio and solid content
Summary
With the improvement of environmental protection requirements and the successive introduction of environmental protection policies in various countries, water-based polyurethanes (WPU) have been widely used because they use water as a solvent, are non-polluting, safe and reliable, and have good mechanical properties and good compatibility [1,2,3,4,5,6]. Prepared aqueous polyurethane emulsions with a solid content of more than 50% and a viscosity of less than 200 mPa·s using different macromolecular diols as raw materials. This cannot be widely used as the application performance is limited by synthetic formulation in many cases [17]. It is meaningful to study the effect of charge on the particle size ratio (the ratio of the equivalent particle diameters of two different emulsions’ particle sizes) by the carboxylic acid/sulfonic acid type aqueous polyurethane. A high solid content waterborne polyurethane with particle bimodal distribution was prepared by a special physical blending method. A series of high solid carboxylic acid/sulfonic acid waterborne polyurethanes was prepared by the emulsion dispersion method. The corresponding model was established, providing a theoretical basis for the preparation of high solid waterborne polyurethane
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