Wax is used earlier as a coating and ink additive, which is characterized by simple use. After coating construction, due to solvent volatilization, wax in the coating precipitates, forming fine crystals, floating on the surface of the coating film, which plays a variety of roles in improving the performance of the coating film. Now, in addition to polymer mineral wax, natural wax is rarely used in coatings and inks. Instead, polymer wax and their modified derivatives are used. They can give the film good water resistance, moisture and heat resistance, scratch resistance, extinction, anti fouling, and good hand feel. Their scratch resistance is beyond the reach of pigment extinction. Polypropylene wax is a low molecular weight polypropylene homopolymer or copolymer widely used in coatings.

The function of polypropylene wax depends on the following factors: the variety and specification of polypropylene, the fineness of particles finally formed and the ability to migrate to the surface of the film, as well as the composition of the coating, the properties of the coated substrate, construction and application methods, etc. The following describes its function:

1. Extinction

Different waxes have different effects on the gloss of the film: from significant extinction to increasing gloss and producing different gloss and hammer lines. Feel: wax additives make the coating have a good feel, which can not be achieved by other matting agents.

2. Wear resistance

One of the factors to improve the anti friction and anti scratch is to reduce the friction coefficient of the coating surface, so that when the object contacts the coating surface, the sliding tendency is greater than the scratch tendency. In this regard, the function of polypropylene wax is similar to silicone oil. The difference is that the former exists on the coating surface in the form of fine dispersed particles. Only a small amount is needed to achieve scratch resistance.

Polypropylene wax, added to the coating, can greatly reduce the tendency of polishing due to friction, and maintain the durability of low gloss, which is often needed in application. For example, in alkyd varnish, when the dosage of polypropylene wax is 1.5%, the anti-wear value of the film is doubled, and when the dosage is 3%, the anti-wear value is increased by 5 times. When metal objects contact coated products, they sometimes leave black marks on the film. Adding polypropylene wax to the film can reduce this tendency or make the marks easy to wipe off. Micro powder wax is used in printing ink to significantly improve the wear resistance of ink.

3. Anti adhesion

Some workpieces, such as wood or gold exhibition objects, often need to be stacked up in a short time after coating. The progress of printing technology also requires ink to avoid the pollution of printed matter. Polyethylene wax can prevent adhesion and dirt caused by cumulative overlap of production or printing materials.

4. Anti sedimentation, anti sagging and thixotropy

Positioning of metal pigments. Polyethylene wax dispersed in aromatic and aliphatic solvents can increase the precipitation resistance of coatings and inks. It also shows varying degrees of thixotropy, sagging resistance and positioning of metal pigments.

Polyethylene wax can be added to coatings and inks in many ways

(1) Size and micro powder size are the pre dispersed form of polyethylene wax in solvent, which is convenient to add. Micro powder is the most widely used form. Various brands of wax powder are suitable for coatings and inks of different varieties and requirements. They can be selected according to the physical and chemical performance indexes and particle size distribution of wax. Physical and chemical properties mainly refer to the properties of wax itself, such as chemical structure, molecular weight, melting point, penetration, acid value, etc. particle size refers to particle diameter and its distribution, particle shape and surface state in microns.

2) Emulsion and dispersion lotion are the stable dispersion state of wax in water, and the particle size is usually less than 1m. Below 200 nm, it is usually transparent or translucent. The particle size below 1m is called dispersion or differential dispersion. Aqueous dispersion makes the application of polyethylene wax in waterborne acrylate and polyurethane coatings and inks very convenient. 

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