There is no absolute non-fading products, the use of color masterbatch coloring products are still possible to fade, but for different grades of different products only, some more obvious, while others are difficult to detect.

Plastic coloring products will be affected by a variety of factors will fade. The fading of plastic coloring products is related to the light resistance, oxidation resistance, heat resistance, acid and alkali resistance of the pigment and the characteristics of the resin used. Should be based on the processing conditions of plastic products and the use of requirements in the production of masterbatches of the required pigments, dyes, surfactants, dispersants, carrier resins and anti-aging additives to the comprehensive evaluation of the performance before use.

Color Masterbatch because of the first pretreatment of pigments, a higher tinting strength, the amount can be reduced and the quality and stability, transportation, storage, easy to use, greatly reduce environmental pollution.

Dispersing agents through the wetting of the pigment, osmosis to exclude the surface air, the aggregates, aggregates dispersed into small, stable and uniform particles, and no longer in the process of cohesion, commonly used dispersant for low molecular weight polyethylene wax, For the more difficult to disperse the organic pigments and carbon black using EVA wax or oxidized polyethylene wax, synthetic low molecular weight polyethylene wax and polyethylene cracking of low molecular weight polyethylene wax are very different.

Other additives are coupling agents, antioxidants, light stabilizers, antistatic agents, fillers, depending on the requirements and varieties may be added, called multi-functional masterbatch, and then adding brightener, is conducive to molded products Stripping and improve product surface brightness.

Color masterbatch performance indicators, color, brightness, yellow, yellowing, thermal stability, oxygen index, melt flow rate, of course, the fineness of the pigment, migration, chemical resistance, toxicity and Color Masterbatch Particle performance, some indicators in the special purpose is very important, such as fiber-grade masterbatch filter value (DF value) fineness.

1. Light resistance

The light fastness of the coloring agent directly affects the fading of the products, and the light fastness (light fastness) of the coloring products used in the outdoor products is an important index, and the light fastness is poor and the products will fade quickly in use. Weathering products selected light level should not be less than six, the best choice of seven, eight, indoor products optional four or five. The light resistance of the carrier resin also has a greater impact on the color change, UV-induced resin after irradiation of its molecular structure changes occur discoloration. Light stabilizers such as ultraviolet absorbers are added to the masterbatch to improve the light fastness of the colorants and colored plastic articles.

2. Heat resistance

The thermal stability of the pigment refers to the degree of heat loss, discoloration and discoloration of the pigment at the processing temperature. Inorganic pigments for the metal oxide, salts, thermal stability, high heat resistance. The organic compounds of the pigment at a certain temperature will change the molecular structure and a small amount of decomposition. Especially PP, PA, PET products, processing temperature above 280 ℃, in the choice of colorants on the one hand to pay attention to the heat resistance of pigments, on the one hand to consider the heat-resistant pigment time, usually require heat-resistant time of 4-10rain ....

Some of the metal ions in the pigment will promote the thermal decomposition of the resin, in which copper, manganese, iron, cobalt and other pigments to promote the aging of polyolefins strong, and potassium, sodium, cadmium, calcium and other pigments . The same kind of metal elements in pure metal, metal oxides, metal salts in order to enhance.

3. Oxidation resistance

Some organic pigments in the oxidation of macromolecules after the degradation or other changes in the gradual discoloration, this process is the processing of high-temperature oxidation, and the second case of strong oxidants (such as chrome yellow chromate) in the oxidation. Lakes, azo pigments and chrome yellow mixed use, the red will gradually diminish.

4. Acid and alkali resistance

Color fading of plastic products and the chemical resistance of coloring agents (acid and alkali resistance, oxidation resistance reduction). Such as molybdenum chromium red resistant acid, but alkali-sensitive, cadmium yellow acid, the two pigments and phenolic resin for some coloring agent strong reduction effect, seriously affect the colorant heat resistance, weathering and fade.