Wax is used as a coating and ink additive earlier, and its characteristics are simple to use. After the coating is applied, the wax in the coating precipitates due to the evaporation of the solvent, forming fine crystals, floating on the surface of the coating film, and playing various functions of improving the performance of the coating film. In addition to high molecular mineral waxes, natural waxes are rarely used in coatings and inks, replaced by polymeric waxes and their modified derivatives. They impart good water, heat, scratch, matting, and anti-stick properties to the film, and have a good hand. Their scratch resistance is not achieved by pigment extinction. As a auxiliaries, polymer wax is used in an amount of 0.5 to 3%. It is suitable for acrylic paints, alkyd paints, nitrocellulose paints and polyurethane paints, industrial baking paints, vinyl paints and latex paints. The combination of polymer wax and fumed silica can improve the performance of the coating film, and its matting effect, water resistance, chemical resistance, scratch resistance, wear resistance and interlayer adhesion are obviously improved. Polypropylene waxes are low molecular weight polypropylene homopolymers or copolymers that are widely used in coatings. By wax, it is meant that the final distribution of the polymer in the form of crystallites on the surface of the coating acts like wax and more diverse. Wax as an additive plays an increasingly important role in coatings and inks.

The effect of the polypropylene wax depends on several factors: the type and specification of the polypropylene, the fineness of the final formed particles and the ability to migrate to the surface layer of the coating film, the composition of the coating, the nature of the substrate to be coated, the application method for construction, and the like. The following describes its role:

1. Extinction.

Different types of wax have different effects on the gloss of the film: from significant matting to increased gloss and uneven gloss and hammer. Feel: Wax additives give the coating a good feel that is not possible with other matting agents.

2. Wear resistance.

Anti-scratch, anti-wear, anti-polish, anti-marking One factor to improve anti-friction and scratch resistance is to reduce the friction coefficient of the coating surface, so that when the object touches the surface of the coating, the sliding tendency is greater than the scratching tendency. The effect of the wax is similar to that of silicone oil, except that the former is present on the surface of the coating in the form of finely dispersed particles. It takes only a small amount to achieve scratch resistance. Polypropylene wax, which is added to the coating, greatly reduces the tendency to be polished by friction, while maintaining low gloss durability is often desirable in applications. For example, in the alkyd varnish, when the amount of the polypropylene wax is 1.5%, the anti-wear value of the coating film is doubled, and when the amount is 3%, the anti-wear value is increased by 5 times. When metal objects are in contact with the coated product, they sometimes leave a black mark on the film, which can be reduced by adding the polypropylene wax to the film or making the print easier to wipe off. The use of micronized wax in printing inks can significantly improve the abrasion resistance of the ink.

3. Anti-blocking properties.

Some workpieces, such as wood or metal objects, tend to stack up in a short period of time after coating. Advances in printing technology also require inks to avoid staining of printed matter. Polyethylene wax prevents adhesions and stains caused by the accumulation of accumulated prints or prints.

4. Anti-precipitation, anti-sagging, thixotropic.

The positioning of metallic pigments. Polyethylene wax is dispersed in aromatic and aliphatic solvents to increase the precipitation resistance of coatings and inks. It also exhibits varying degrees of thixotropy, sag resistance and localization of metallic pigments.

Polyethylene wax can be added in a variety of ways in coatings and inks:

(1) The slurry and the fine powder slurry are pre-dispersed forms of polyethylene wax in a solvent, and are convenient to add. Micronized powder is one form of the most common application. A variety of brands of wax powder are suitable for different varieties and requirements of coatings and inks, can be selected according to the physical and chemical properties of the wax and particle size distribution. The physical and chemical properties are mainly the properties of the wax itself, such as chemical structure, molecular weight, melting point, penetration, acid value, etc. The particle size refers to the particle diameter and its distribution in micrometers, particle shape and surface state.

(2) The emulsion and the dispersion emulsion are stable dispersion states of the wax in water, and usually have a particle diameter of 1 m or less. Below 200 nm, it is usually in a transparent or translucent state. Those having a particle diameter of 1 m or less are referred to as dispersions or microdispersions. Aqueous dispersions make polyethylene waxes extremely convenient for use in aqueous acrylate and polyurethane coatings and inks.