Plastic color matching guide -color performance indicators of pigment dyes

The color performance of plastic dyes and pigments usually includes color, saturation, brightness, transparency (or cover force), and duality. In the process of communicating with plastic application customers, we often find that the color and significance of the color and optical properties of the color matchmaker do not know enough about the color and optical properties of the color. In fact, these properties determine the success or failure of plastic color matching.

1.

Color power (also known as coloring strength) is a measuring the depth of the color of the color. On plastic, the color force is instructed to contain 5%TIO2 polyvinyl chloride (PVC) or 1%polyolefin (PO) plastic per kilogram to achieve the amount of color (gram) required for color standard depth (SD).

From an optical perspective, the maximum absorption wavelength of the coloring agent determines its color, and the absorption ability at the maximum absorption wavelength determines its color force.

From a chemical perspective, the main factors that affect the color force are chemical structure and crystal structure. Most organic pigments and dyes are stronger than inorganic pigments.

In addition, the color force increases with the increase of saturation, and decreases as the brightness increases; it is also related to the components, materials and application conditions of the coloring substances.

The importance of color power is self -evident, and it is directly related to the cost of coloring costs. The lower the standard depth value, the higher the color force, and the lower the color power. We generally use the value of 1/3 standard depth (1/3 SD) to determine the color of the color.

Second, saturation, brightness, cover force

The three-coordinate parameters of the color (hue, saturation, brightness) are the benchmark for positioning the color value of the color, see Figure 2-1. When the hue is from yellow to red, purple to blue, the color is from light to deep, and the saturation is from high to low.

In the saturation coordinates, the farther the coordinating agent from the original point coordinates, because it has higher saturation, it can always be mixed with other colorants or poured black to cover the low saturation color near the coordinate original point. Therefore, the higher the saturation of a coloring agent, the greater the color value, the wider the application.

For the same chemical color, as the color is increased, the saturation increases, and the brightness decreases, and the hue varies varies with different colorants.

The covering power (or transparency) of the color agent is closely related to the color force. Generally, the cover force of inorganic pigments is high, and the dye is transparent because it is dissolved in the resin in the form of molecular. Most plastic coloring products have requirements for covering power. The covering power of the coloring products depends not only on the cover ability of the color agent itself, but also due to the application concentration of the color agent. The material and thickness of the product. Therefore, a high -covered cohener usually has good application value.

All in all, if a coloring agent has high saturation, high covering power and high color force, it can explain its commercial value.

Three, two -color

Both color refers to a transparent coloring agent (mainly dye) for plastic coloring, a kind of nature of the color tone with the concentration of the color or the thickness of the product. Both color is the inherent characteristic of the color that changes in the shape of the transmitted curve.

The degree of two -color characteristics of yellow, orange, red, and purple coloring agents rises in order in order of hue, because their spathered transmission curves are asymmetric. In contrast, the blue and green spacing transmission curve tends to be symmetrical, so its two -color characteristics are small or there is no duality.

Two -color can cause difficulty in color matching. In transparent plastic coloring, dual -color phenomena often occur. When the concentration of the color agent changes, the color of the items will also change, and it will cause changes in the tone. This phenomenon will also occur in translucent or even opaque plastic color matching.

Solvent dyes are often used in hard glue transparent coloring, and often encounter dual -color problems during color matching. Because the solvent dye can be dissolved in certain solvents (DMF, acetone, ethanol, etc.), solvent dye dilation tests can be used in a simple method to prepare some solutions of different concentrations, and then observe their color change changes. Know the color changes in plastic. You can also use the color measuring instrument with a spatuan transmission function to obtain the spectral reflection curve to judge.