The improvement of water-based polyurethane performances with carbodiimide crosslinkers

With the introduction of various environmental protection policies and the enhancement of consumer awareness of environmental protection, water-based products have gradually become the future development trend of coatings and adhesives.

Taking water-based polyurethane as an example, its main dispersion medium is water. It has the advantages of traditional polyurethane such as flexibility and low-temperature resistance. Besides, it has many advantages such as low VOCs emission, non-flammable, environmentally friendly, and low cost.

However, water-based polyurethane has some shortcomings in abrasion resistance, hydrolysis resistance, chemical solvent resistance, mechanical strength, etc. At present, a low-cost, fast and efficient way is to add crosslinking agent to make the polyurethane cured into a stronger three-dimensional mesh structure. Through chemical reaction, the polyurethane has larger molecular weight and better mechanical strength. After curing, the coating will have better abrasion resistance, hydrolysis resistance, chemical resistance, and adhesion to the substrate.

crosslinkers

Carbodiimide crosslinker is a new type of crosslinker commonly used in waterborne polyurethane. It is safe, environmentally friendly, and non-toxic, and can crosslink with the carboxyl group of polyurethane to achieve an excellent curing effect.

Compared with traditional crosslinkers such as aziridine and isocyanate, the main advantages of carbodiimide crosslinkers are two: firstly, they are green and environmentally friendly, which coincide with the green development trend of waterborne coatings and related environmental protection policies; secondly, they have a long adaptation period, which is conducive to the long-term storage of waterborne polyurethane and saves material costs and construction costs.

HyMax CA Waterborne Crosslinker

Langyi New Material is a professional supplier of carbodiimide products, with more than ten years of experience in R&D and production, and has developed a series of crosslinker products for different application scenarios, such as water-based crosslinkers, general-purpose crosslinkers, and emulsion crosslinker, and the quality products have been available worldwide.

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