Life we can see a variety of colors of silicone products, you may be wondering, how is the silicone products coloring ? Silicone products to color according to whether the product is dynamic or static to deal with. silicone products coloring methods are mainly colored and mixed coloring two.
Surface color is the colorant sprayed to the surface of silicone products, so that silicone products coloring. The law of static products have a certain effect on the dynamic products, coloring agent easy to peel off, easy to fade.
Mixing coloring is the main method of silicone products coloring, divided into two kinds of solution and mixing method.Which mixed with dry powder coloring, coloring paste, pellet coloring and masterbatch coloring and several other methods.
1. Solution coloring
The method is to dissolve the rubber with its good solvent into a certain concentration of the solution, and then the coloring agent and the addition of sulfur outside the rubber compound into the solution mixing and mixing evenly, at a certain temperature to remove the solvent drying, and finally in the mixing machine Add sulfur. This coloring method is complicated, the colorant and the blending agent are dispersed unevenly, the color is poor, the solvent is difficult to recover, and the environment is polluted.
2. Mixing coloring
This method is the most commonly used method of coloring silica gel products, the colorants are directly added or mixed with the carrier and then add the compound, through the mixing machine mixing evenly, so that the rubber coloring. The specific method is as follows:
Dry powder coloring method is directly with the powder coloring agent with small material together with the rubber, in the mill on the mixing. The advantages of the law is simple operation, low cost, but the mixing of dust, pollution of the environment, and easy to disperse evenly, with color, if the particles are too thick too thick, but also cause color points, stripes or chromatographic pollution and other quality problems, Has been less used. For ease of use, the powdered colorant may be prepared as a pre-dispersed colorant together with stearic acid, sulfate, etc., and the market has been sold.
Coloring Coloring This method involves mixing the colorant with a liquid compounding agent (such as a plasticizer), grinding it with a three-roll machine to form a paste or slurry, and then adding it to the rubber in a proportion. This method can avoid dust flying, but also conducive to the coloring agent in the rubber dispersion, color uniformity.
But the colorant in the low content of colorants, color is not high, large transport, loss of large, the user is not convenient. There are two main methods for the preparation of pellets. The first method is the same as the other powder compounding granulation method, the powdery colorant is first impregnated with the surfactant, then melted by melting or melt extrusion with the resin; the second method is to use the colorant Surfactant infiltration and then by the role of mechanical force to make the particles fine particles, made of a certain concentration of the dispersion, and then mixed with latex Shen Shen, after drying granulation. Among them, surfactants are mostly anionic and nonionic, such as fatty acid salts, sulfonates, etc., latex is usually used natural latex.
This kind of granular colorant easy to use, good dispersion, no dust flying, do not pollute the environment, bright color, hair color uniformity, no color, is a very promising method of coloring. But the granular colorant preparation process is complex, high cost, limiting its wide range of applications.
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