Whether PU color paste needs to be added with a curing agent depends on the specific application scenario and product type. Generally speaking, PU color paste itself is mainly used to provide color for the polyurethane system, and does not necessarily require a curing agent. However, in some cases, a curing agent may be required to optimize the curing performance of the color paste and improve the durability of the product.
Two common situations:
PU color paste is used in coating systems:
In polyurethane coatings, color pastes are usually mixed with resins and curing agents. At this time, a curing agent is necessary because it can react with the polyurethane resin to achieve curing. If only color paste is added without a curing agent, the coating will not harden properly and the coating will not achieve the expected performance.
PU color paste is used for soft materials:
For such applications, it is usually mixed with polyurethane resins and hardeners. In this case, if the goal is to give the product a certain hardness, elasticity or wear resistance, adding a curing agent is necessary.
Factors to consider:
Type of color paste: Some PU color pastes may have pre-adjusted their compatibility with the substrate. When adding a curing agent, the compatibility of the color paste and the hardener must be confirmed.
Substrate type: Different substrates may require different types of curing agents. Soft PU usually requires a relatively mild curing agent, while hard PU may require a stronger curing agent.
PU color paste itself does not necessarily require a curing agent. The addition of curing agent mainly depends on the specific use requirements, especially the curing process of coatings and other PU products.
