There are four methods for the production process of masterbatch:

(1) Kneading method: After mixing the pigment and the oily carrier, the pigment is washed out from the water phase into the oil phase through kneading by using the characteristic of the pigment to be lipophilic. At the same time, the oily carrier coats the surface of the pigment to stabilize the dispersion of the pigment and prevent the pigment from agglomerating.

(2) Ink method: As the name suggests, it is a production method that uses ink color paste in the production of masterbatch, that is, through three-roll grinding, a low-molecular protective layer is coated on the surface of the pigment. The ground fine color paste is mixed with the carrier resin, and then plasticized by a two-roll plastic mill (also called a two-roll mill), and finally pelletized by a single-screw or twin-screw extruder.

The process is as follows: ingredient mixing coarse color paste three-roll grinding fine color paste two-roll plasticizing extrusion granulation

(3) Metal soap method: After the pigment is ground, the particle size reaches about 1μm, and soap liquid is added at a certain temperature, so that the surface layer of each pigment particle is evenly wetted by the soap liquid to form a layer of saponification liquid. After the salt solution is added, it chemically reacts with the saponification layer on the surface of the pigment to form a protective layer of metal soap (magnesium stearate), so that the finely ground pigment particles will not cause flocculation and protect a certain amount of fineness. degree

(4) Washing method: the pigment, water and dispersant are sand-milled to make the pigment particles smaller than 1μm, and the pigment is transferred into the oil phase by the phase transfer method, and then dried to obtain the masterbatch. Organic solvents and corresponding solvent recovery devices are required for phase inversion.

Precautions for using masterbatch

(1) Attention should be paid to the selection of the dilution ratio of masterbatch. Choose a high dilution ratio, the production cost is lower, but it is also limited by the processing equipment

(2) Use masterbatch to match colors to achieve the desired color and luster must be very careful, color difference and shade changes often occur.

(3) The color masterbatch will absorb moisture after being stored for a period of time, especially PET, ABS, PA, PC, etc., so it must be dried according to the same process as the natural color pellet and meet the moisture content requirement.

(4) The color masterbatch will react with other additives, so be careful when using it.

Color masterbatch classification

The classification methods of color masterbatches are as follows:

Classified by carrier: such as PE masterbatch, PP masterbatch, ABS masterbatch, PVC masterbatch, EVA masterbatch, etc.

Classified by purpose: such as injection masterbatch, blow molding masterbatch, spinning masterbatch, etc. Each variety can be divided into different levels.