In addition to pigment 丨 who can pose a threat to the quality of PP masterbatch

In addition to paint, who can pose a threat to the quality of the masterbatch, masterbatch is known mainly by the pigment, and dispersant composed of polymer carrier. So in addition to the pigment, the carrier and the dispersing agent is a major factor.

How to choose a carrier with a dispersing agent?

1. The carrier
Carriers should use some and polypropylene polymers have good compatibility, low melting point than the spinning resin 20-30 ℃, it not only does not affect the quality of the product but also has anti-flocculation of pigments; good dispersion (ie spread to dilute concentrated pigment resin resin performance).

PP masterbatch carrier often used polyolefins can be used are: molecular 1.5 to 20,000 high-pressure polyethylene, low-pressure polyethylene or polypropylene melt index of 20.

2. Dispersant
Join the thermoplastic polymer masterbatch dispersant generally compatible polymer due and bad will affect the spinning properties of the polymer, it is best to use the polymer itself as a dispersant. Optional low molecular weight polymer or oligomer. As PP masterbatch with sub-agents taught abroad generally low molecular weight polyethylene (polyethylene wax), it can not only increase the entropy Wen Yan debate particle repulsion, prevent pigment flocculation in the polymer, and can improve the polymer the melt flow properties, improved spinnability.

Polyether is also a good polyolefin pigment dispersant, also has mobility, and good antistatic properties.

In addition, as dispersants there are many anionic surfactants. Amines such as good thermal stability. They include primary amines, secondary and tertiary amines (heterocyclic tertiary amines, alkyl imidazolines, etc.); an anionic surfactant may also be employed. Commonly used are fatty acids and salts thereof, such as zinc stearate, sodium dodecyl sulfate, liquid paraffin, sunflower oil.

In order to give full play to the characteristics of various dispersants, mixing effect is more ideal. If only in order to provide a repulsive force from the dispersion entropy, as long as the dispersant added a very small amount, and polypropylene for good mixing and dispersing agent must be a certain amount or more, in the masterbatch is generally added in an amount of 1/3 of the polypropylene.

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