Special whitening agent for artificial stone.

The mixture of stone powder and crushed stone with organic resin as a binder is collectively called resin-type artificial stone. Artificial stone has the advantages of high strength, low density, corrosion resistance, and convenient shaping, but the glossiness and whiteness are not as high as natural stone, and the weather resistance is also worse than ordinary granite and marble.
The factory standards of resin-type artificial stone are mainly whiteness and weather resistance. Because artificial stone is mostly used in outdoor stairs, outdoor floor tiles, and other scenes, long-term exposure to the sun's ultraviolet rays will change its internal structure, causing the stone to fade, yellow and reduce its strength.
Most manufacturers will choose to add titanium dioxide to change the whiteness of artificial stone. The whitening principle of titanium dioxide is to cover the original color of the product through its whiteness to achieve the purpose of whitening. The surface gloss of the stone whitened with titanium dioxide is very low, and the structure of the artificial stone itself is changed, resulting in low weather resistance. Therefore, titanium dioxide is not the choice for whitening resin-type artificial stone.
The main whitening principle of fluorescent whitening agent is to absorb ultraviolet light in nature and convert it into blue-violet light visible to the naked eye, which complements the yellow light of the product itself to achieve the whitening effect and will not change the structural characteristics of the product itself.

The resin-type artificial stone produced by adding a fluorescent whitening agent has an ultraviolet light absorption rate of more than 65%, which greatly reduces the invasion of ultraviolet light on its materials, thereby improving the weather resistance of the product itself.

Hongyi Chemical recommends the special whitening agent OBJ for artificial stone. The light resistance level of fluorescent whitening agent OBJ can be as high as level 7, which fully meets the long-term use of artificial stone outdoors. The special fluorescent whitening agent OBJ for artificial stone developed and produced by our company has improved the anti-yellowing performance of resin-type artificial stone by more than 35%.