Environmental friendly waterborne coatings or finishing agents are deficient in water resistance, solvent resistance, wear resistance and other aspects. Currently, the effective solution is to improve the coating performance by adding cross-linking agents. The crosslinking agent can react with various polymers to form a network structure, improve the molecular weight and improve the comprehensive properties of water-based coatings.
Polycarbodiimide (PCDI) is a new kind of environmental crosslinking agent with properties such as low toxicity, zero VOC, easy dispersion in water system, the activation period is long and curing conditions is mild. The coating after crosslinking obtained excellent chemical resistance, abrasion resistance and resistance to hydrolysis, the strength of which is also significantly improved. Therefore polycarbodiimide becomes an ideal crosslinking agent for high-performance coating agent.