Masterbatch pigment used, masterbatch technically must pay attention to pigment with plastic raw materials, additives with the relationship between the selection points are as follows.
1, Pigments can not react with the resin and various additives, solvent resistance, mobility, heat resistance and so on.
In other words, the masterbatch can not follow a variety of chemical reactions, such as carbon black can control the curing reaction of polyester plastics, carbon black pigment can not be added to the polyester.
Masterbatch technology because plastic molding processing temperature is high, so the pigment should be formed under the conditions of heating temperature does not decompose discoloration.
Generally inorganic pigments better heat resistance, poor heat resistance of organic pigments and dyes, which should be selected when the pigment varieties of sufficient attention.
2, Coloring of the dispersion, coloring power should be good.
When the pigment is unevenly dispersed, the appearance and appearance of the product will be affected. When the pigment has poor coloring, the amount of the pigment will increase and the material cost will increase. The same pigment does not have the same dispersion with the color force in different resins. Therefore, In the choice of pigment should pay attention to this.Color the particle size with the dispersion is also related to pigment particle size is smaller, the better the dispersion, the coloring power is also strong.Technical requirements of masterbatch is very strict, generally adopted Masterbatch technology is the wet process. Masterbatch by water phase grinding, phase, washed, dried, granulated, but only such product quality can be guaranteed.
Masterbatch technology process there are four ways
(1) masterbatch technology process ink method: As the name implies, the production method of ink color paste is adopted in the production of masterbatch, that is, the pigment surface is coated with a low-molecular protective layer by three-roller grinding, the fine color paste after grinding is mixed with the carrier resin, The roll-mill (also called a two-roll mill) is plasticized and finally pelletized by a single-screw or twin-screw extruder.
(2) masterbatch technology process flushing method : Is a pigment, water and dispersant by sanding, the pigment particles less than 1μm, and by phase transfer method, the pigment is transferred to the oil phase, and then dried to prepare masterbatch phase conversion requires the use of organic solvents, and the corresponding Solvent recovery unit.
(3) masterbatch technology kneading method : Is the pigment mixed with the oily carrier, the use of pigment lipophilicity of this feature, by kneading the pigment washed into the oil phase from the water phase. At the same time by the oily carrier pigment surface coating, the pigment dispersion stability, to prevent pigment condensation .
(4) masterbatch technology metal soap method : Is the pigment after grinding the particle size of about 1μm, and at a certain temperature by adding soap, so that each pigment particle surface layer is uniformly wetted by the soap liquid to form a layer of saponification liquid, when the metal salt solution is added followed by the pigment Surface of the saponification layer chemical reaction and the formation of a protective layer of metal soap (magnesium stearate), so that the finely ground pigment particles will not cause flocculation, and to protect a certain degree of fineness.