Home > News > Content

Whitening Of Unsaturated Resin

Jun 20, 2020

Some users who use unsaturated resins may experience resin whitishness. Here, we collect and organize some information for reference:

       Phenomenon 1, the product appears partially whitish, the overall shade is different, and there are small bubbles on the surface.

       This phenomenon is mainly due to the poor defoaming ability of the material. The main solutions are to increase the proportion of reactive diluent; choose a curing agent with a low viscosity and a long curing time; reduce the proportion of filler; choose a stronger defoamer

       Phenomenon two, the appearance of hexagonal floating hair color is called Bernard nest and silk pattern

      This phenomenon is mainly caused by pigment-containing systems. Different pigments will stay in different areas according to their different abilities of movement. On the horizontal plane, this floating color presents a hexagonal mesh pattern, called Bernard's nest. The silk pattern is actually the same, but it occurs on the facade and appears as a linear pattern.

       Phenomenon three, gray materials are prone to bloom

Among the pigments, carbon black is the lightest, while titanium white is heavier. This feature makes the two pigment particles easy to delaminate. Moreover, the specific surface area of carbon black is extremely large, and more dispersants are needed. The above several characteristics determine that carbon black should use a polymer wetting and dispersing agent. Generally, one part of carbon black needs one part of auxiliary agent. About two parts of resin and two parts of active diluent are used to prepare color paste. Generally, it is ground more than three times.

The above three points are the main reasons for these problems. In order to improve product quality, manufacturers should start with raw materials first, and choose to purchase good quality raw materials. This can greatly avoid the failure of non-manual technology