With the introduction of various environmental protection policies and the enhancement of consumers’ awareness of environmental protection, water-based products have gradually become the future development trend of coatings and adhesives. Take water-based polyurethane as an example, it has the advantages of traditional polyurethane such as flexibility and low-temperature resistance. Since its main dispersion medium is water, it also has many advantages such as low VOCs emission, non-flammable, environment-friendly, and low cost.
However, water-based polyurethane has some shortcomings in abrasion resistance, hydrolysis resistance, chemical solvent resistance, mechanical strength, etc. The low-cost, fast and efficient way is to add a cross-linking agent to make the polyurethane cured into a stronger three-dimensional mesh structure through a chemical reaction. After the reaction, the product can get a larger molecular weight and obtain a better mechanical strength. After curing, the coating will have better abrasion resistance, hydrolysis resistance, chemical resistance, and adhesion to the substrate.
Carbodiimide crosslinker is a new type of crosslinker commonly used in waterborne polyurethanes, which is safe, environmentally friendly, and non-toxic. It 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 environmental 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 can save material and construction costs.
Langyi New Materials has more than ten years of experience in R&D and production. We have developed a series of crosslinker products for different application areas, such as water-based crosslinkers, general-purpose crosslinkers, and emulsion crosslinkers. For more application solutions, please get in touch with us.