The difference between waterborne polyurethane dispersions and waterborne polyurethane resins

2025,11,17

Often, people ask about the differences between waterborne polyurethane dispersers and waterborne polyurethane resins. Today, let's take a look at exactly what the differences are between them?

I. Definition

Waterborne polyurethane dispersion is a high-molecular solution formed by the dispersion of polyurethane with a dispersant. It can form transparent, semi-transparent or milky white dispersed liquids in water and is an important waterborne resin material. Waterborne Polyurethane Resin refers to a kind of polymer resin produced by blending and polymerizing polyurethane with other waterborne materials such as acrylic acid, acrylate, butadiene acid, methacrylic acid, etc.

2. The particle sizes of ‌ are different

The particle size of waterborne Polyurethane Resin is usually greater than 100nm, presenting a white and turbid dispersed state, with poor stability and uniformity, and a relatively low cost. The particle size of waterborne polyurethane dispersion is between 0.001 and 0.1μm, with a semi-transparent appearance, good stability and uniformity, and a medium cost.

3. Differences in Chemical Structures

Waterborne polyurethane dispersions and waterborne polyurethane resins differ in chemical structure. Waterborne polyurethane dispersions are prepared with end-capping polyols as the main chain and isocyanates, while waterborne polyurethane resins are composed of isocyanate prepolymers as the main chain and other copolymer monomers.

4. Different natures

Due to the difference in chemical structure, the properties of waterborne polyurethane dispersions and waterborne polyurethane resins also vary. Waterborne polyurethane dispersions have excellent water resistance and chemical corrosion resistance, as well as good flexibility, weather resistance and adhesion. Waterborne polyurethane resin features high tensile strength and elastic modulus, as well as excellent oil resistance and wear resistance.

5. Differences in Application Fields

Waterborne polyurethane dispersions and waterborne polyurethane resins also have slight differences in application fields. Waterborne polyurethane dispersions are mainly used in fields such as coatings, adhesives, sealants, and inks, while waterborne polyurethane resins are widely applied in the automotive, aviation, construction, electronic equipment, furniture, packaging, and other sectors.

To sum up, although both waterborne polyurethane dispersions and waterborne polyurethane resins are waterborne polyurethane resin materials, they have slight differences in chemical structure, application fields, and many other aspects. When using it, we should choose the appropriate product according to the actual application needs.

Author:

Ms. Cherry

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348754229@qq.com

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