The coloring method for silicone rubber products

Many consumers are easily attracted by the color and appearance of certain products, especially in categories such as gifts and handicrafts. As we all know, silicone products, as a rubber and plastic material that is both practical and beautiful, have a wide range of application scenarios in daily life. In addition to its functionality, the main reason why silicone products can achieve multi-color effects and saturated color systems is the careful design and investment in its appearance and color adjustment. So, specifically, what is its detailed production process?

The coloring of silicone products is mainly achieved through the following methods, and the appropriate technology is selected in combinationwith material characteristics and process requirements:

1. Coloring in materials (mixing method)

This is the most commonly used coloring method. By mixing the colorant directly into the silicone raw material, the color is evenly distributed:

• Dry powder coloring

Add powdered colorant (such as masterbatch) directly into the silicone and mix it through an open mill. The advantages are low cost and simple operation,

but the dust pollution is large and attention should be paid to the uniformity of dispersion.

• Color paste coloring

Mix the colorant with a liquid compounding agent (such as silicone oil) and grind it into a slurry, and then mix it with silicone. It is suitable for scenes that require

high-precision color matching, but the transportation and storage costs are high.

• Pellets coloring

Mix the colorant and the carrier (such as wax or resin) into silicone after melting and granulation to improve dispersibility and stability, which is suitable for mass

production.

2. Surface treatment and coloring

For finished products or partial color requirements, post-processing technology is used:

• Spraying/pad printing

Spraying: Spray paint or coating evenly on the silicone surface, suitable for complex shapes and multi-color effects.

Pad printing: Transfer the pattern to the silicone surface through a rubber head machine, often used for flat or slightly concave and convex decoration, such as LOGO printing.

• Laser engraving/etching

Laser engraving can carve fine patterns on the surface, and the etching method forms textures through chemical reactions, which is suitable for

high-end customized products.

• Molding coloring

Design grooves in the mold and fill them with silicone inks of different colors for a second time to form a three-dimensional color effect.

3. Special coloring technology

• Solution method

Dissolve the silica gel and add the colorant, then vulcanize and form after drying. Due to the complex process and the environmental pollution caused by the solvent, it is now rarely used.

• Anti-yellowing treatment

Anti-yellowing agent (such as special vulcanizer) needs to be added to transparent silica gel to prevent discoloration caused by high temperature or ultraviolet rays.

As a company specializing in the production of silicone rubber products, we are willing to answer your questions regarding such products.

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