PP masterbatch consists of pigment, dispersant, polymer carrier composed of three parts. Today, we talk about Ozawa mainly polypropylene masterbatch production process for the selection of pigment, and introduction of relevant knowledge about paint!

Pigments
Masterbatch production and polypropylene spinning the pigment particle size requirements must be 1μm or less, crude fiber floc particle size and general plastics in 5 ~ 1 01μm. Fiber forming process can withstand various physical, chemical effects. Choice of paint must be stabilized does not decompose at a spinning temperature conditions. While pigment does not have an adverse effect on polypropylene. This is mainly reflected in two aspects: First, the pigment or pigment intermediates radical decomposition of the polymer of α-H off, free-radical polymerization reaction initiator; the second is the pigment contained in metal or metal salt cause thermal oxidation degradation of polypropylene. Also pigment must also have weatherability and the wet fastness (alkali treatment, water treatment), is easily distracted, and other basic properties.

According to the requirements of alternative pigments inorganic pigments and organic pigments into two categories. General Inorganic pigments are natural or synthetic metal oxides, sulfides, and other salts. In light resistance, weather resistance, heat resistance, and resistance to migration are better than organic pigments, inorganic pigments coloring but most low, coarse, color, not bright, poor chemical resistance.

Polypropylene is used for pigments are:
R-type titanium dioxide, zinc white, cadmium yellow, chrome yellow, iron oxide, zinc, cobalt, and nickel titanate and carbon black (channel process and milk method).

And inorganic pigments compared to organic pigment proportion of small, large surface area, high transparency, tinting strength, bright and high, particle size is small, but the heat resistance, light resistance and chemical resistance poor. In recent years, a number of large molecular size of the pigment in a certain extent, to overcome these shortcomings, organic pigments are widely used are:

Phthalocyanine pigments - phthalocyanine blue, phthalocyanine green and the like. Having bright colors, good color and strong nature, light heat resistance reagents.

Azo pigments - including single or dual dual krypton azo-insoluble pigments, widely used, chromatography is complete, bright color, high fastness, but poor heat resistance.

Poly azo pigment - pigment molecular weight, structure is more complex, the main feature is improved insoluble azo pigments heat resistance.

Restore pigment - is characterized by chromatographic than the whole, color fastness. It includes a ring system, anthraquinone, naphthalene anhydride Department anhydride-based pigments such as pyrene.

Different pigments for masterbatch formulation process have different requirements. Such as inorganic pigments, pigment grinding system must be configured. If the solvent phase, but also consider the question to the grinding phase. Organic pigments, especially the oil-soluble pigment can preferably dissolved in the dispersant may be omitted grinding system.

Pigment dispersion agent ratio requirements are also different, in general the small surface area of ​​the inorganic pigments, the dispersant amount is small, the ratio is 60: 40; the surface area of ​​the organic pigment is large, the amount of dispersant is large, the ratio to 40: 60.

Polypropylene fiber-forming pigments also have an impact, mainly in the melt rheological properties, filtration properties, crystallization behavior and performance of fiber-forming process. Carbon black, titanium dioxide, phthalocyanine blue, phthalocyanine green and polypropylene poor affinity, the melt flow viscosity increases, increasing the degree of crystallinity, the fiber-forming performance deteriorated. Azo pigments melt viscosity decreased, the fiber-forming performance has improved.

Famous literature had pigment affect the rheological properties of the polypropylene melt were studied, that the addition of carbon black, phthalocyanine blue and titanium dioxide will decrease the flow properties of polypropylene: while licking GL BR orange and red, but will help to improve the flow properties of polypropylene. Also pointed out that mixing pigment and polypropylene is a heterogeneous system. Mixing the viscous resistance is large, in the processing must ensure sufficient mixing time and shear.

Quality masterbatch purchase, welcome to Yancheng RAJ ​​Masterbatch Limited, we sincerely look forward to working with you!