How to make PVC profiles white？

uPVC profiles production raw materials: PVC, CPE, ACR, titanium dioxide, calcium powder, stabilizer, PE wax, stearic acid, etc.

In the production and use of PVC profiled materials, thermo-photo-oxidative catalytic reactions will occur. Under the action of heat and pressure, polymer macromolecules are oxidized by a small amount of water, acid, alkali and other residues and air, resulting in content decrease while changing the macromolecular structure. This kind of chemical reaction is called dissolution, and its main manifestations are the surface yellowing, the gloss gradually fades, and even graying in severe cases. The discoloration of profiles causes customers to doubt the characteristics of PVC materials, and the adverse effects caused by them are relatively serious.

Titanium dioxide is a good white paste, widely used in plastic profiles, it is also a good light shielding agent. Rutile type (R type) titanium dioxide has a density of 4.26 and a refractive index of 2.72. It can reflect or map most visible light, and can completely absorb ultraviolet light with a wavelength of 410nm. It has good temperature resistance and weather resistance, and has a strong effect of shielding ultraviolet light. , is one of the key raw materials to improve the weather resistance of profiles. In addition, it has the effect of inhibiting the dehydrochlorination of PVC profiles and slowing down the dissolution of PVC. However, because of its high price, some profile factories reduce the consumption of titanium dioxide in order to control costs. To 3.6 parts, or even less, which greatly reduces the weather resistance of the profile.

When the content of titanium dioxide in the product is 8%, its covering rate tends to be balanced, and it is no longer beneficial to exceed this range. Because the addition of titanium dioxide to the fiber material will increase the viscosity, reduce the fluidity, and increase the torque, which will make the production and processing difficult. Generally, about 5 parts can be added. If the whiteness is not enough, a small amount of whitening agent can be added.

Jinan Lumei Building Materials Co., Ltd. is a Taiwan-funded enterprise specializing in the production of PVC extrusion profiles, PVC profiles, plastic strips, and PVC doors and windows.