Silicone rubber sheet white are widely used in several industries for their superior performance. However, many people do not know much about the process of its colour formation. In this article, we will introduce the colouring process of silicone rubber sheet white in detail, revealing the technical principles and steps involved.

The basic principle of the colouring process

The colouring of silicone mainly relies on the addition of pigments during the mixing process. As silica gel itself is transparent or translucent, it can be made to show various colours by adding different pigments. For white silicone sheets, specific white pigments or fillers are required to achieve this.

Specific steps

Selection of pigments

The white pigment used for colouring silicone sheets is generally titanium dioxide (TiO₂), which has excellent covering power and stability and does not affect the original properties of the silicone. Titanium dioxide is a common white filler with high refractive index and chemical inertness, which can be evenly dispersed in silica gel.

Mixing

In the mixing process, titanium dioxide powder is added to the silica gel matrix in a certain proportion. The mixing equipment is usually a denser or opener, and the pigment is dispersed evenly in the silica matrix by mechanical mixing. The temperature and time of mixing need to be strictly controlled to ensure even distribution of the pigment and stability of the silica gel properties.

Moulding

After mixing, the white silica gel mixture needs to go through a moulding process, such as calendering or moulding, to make silica gel sheets. The moulding process needs to ensure the homogeneity of the mixture to guarantee the thickness and surface quality of the sheet.

Vulcanisation

After moulding, the silicone sheet needs to be vulcanised to enhance its mechanical strength and durability. Vulcanisation is usually carried out at high temperatures and pressures, with the vulcanisation temperature typically ranging from 150-200°C. The vulcanisation process is carried out at high temperatures and pressures. During the vulcanisation process, the pigments are more tightly bonded to the silicone matrix and the colours are more stable.

Surface treatment

After vulcanisation, the silicone rubber sheet white can be subjected to surface treatment, such as sanding and polishing, in order to improve its surface finish and aesthetics. Surface treatment not only enhances the appearance of the product, but also increases its service life and performance.

Inspection

Finally, the white silicone sheet needs to go through strict quality inspection to ensure that the colour is uniform, no colour difference, the surface is smooth and the performance meets the design requirements. Products that pass the inspection will be packed and stored, waiting to be shipped out of the factory.

Conclusion

The colouring process of silicone rubber sheet white involves a number of steps from pigment selection to mixing, moulding, vulcanisation and surface treatment. By uniformly dispersing the white pigment in the silica gel matrix, white silica gel sheets with stable colour and superior performance are made. Understanding this process helps to better master the production technology of silica gel sheet and ensure the quality and application effect of the product.