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Application of Polypropylene Wax in Coatings and Ink


Release time:

2022-05-10

Wax as a coating, ink additives, the use of earlier, its characteristics are simple to use. After the coating is applied, the wax in the coating is precipitated due to the volatilization of the solvent, forming fine crystals floating on the surface of the coating film, which plays a role in improving the performance of the coating film. Nowadays, in addition to polymer mineral waxes, natural waxes are rarely used in coatings and inks, replaced by polymer waxes and their modified derivatives. Polypropylene waxes are low molecular weight polypropylene homopolymers or copolymers that are widely used in coatings,. As a wax additive, it plays an increasingly important role in coatings and inks.

Application of Polypropylene Wax in Coatings and Ink

Wax as a coating, ink additives, the use of earlier, its characteristics are simple to use. After the coating is applied, the wax in the coating is precipitated due to the volatilization of the solvent, forming fine crystals floating on the surface of the coating film, which plays a role in improving the performance of the coating film. Nowadays, in addition to polymer mineral waxes, natural waxes are rarely used in coatings and inks, replaced by polymer waxes and their modified derivatives.polypropylene waxIt is a low molecular weight polypropylene homopolymer or copolymer that is widely used in coatings,. As a wax additive, it plays an increasingly important role in coatings and inks.

聚丙烯蜡

polypropylene waxThe role depends on the following factors: the variety and specifications of polypropylene, the fineness of the particles formed, the ability to migrate to the surface of the coating, the composition of the coating, the performance of the coating substrate, the construction application method, etc. Its functions are as follows:

1, extinction. Different types of wax have different effects on the gloss of the coating film: from obvious matting to increasing gloss, there are different gloss and hammer marks. The wax aid gives the coating a good hand which cannot be achieved with other matting agents.

2. Wear resistance. Scratch Resistance, Abrasion Resistance, Polishing Resistance, Scratch Resistance One of the factors for improving the friction resistance and the scratch resistance is to reduce the friction coefficient of the coating surface so that when an object contacts the coating surface, the sliding tendency is greater than the scratch tendency. In this respect, the polypropylene wax acts like a silicone oil, except that the former is present on the surface of the coating in the form of finely dispersed particles. Only a small amount is needed to achieve scratch resistance. The addition of polypropylene waxes to coatings greatly reduces the tendency to be polished by friction while maintaining the low gloss durability often required in applications. For example, in alkyd varnish, when the amount of polypropylene wax is 1.5%, the abrasion resistance of the coating film is doubled, and when the amount is 3%, the abrasion resistance is increased by 5 times. When metal objects come into contact with the coated product, they sometimes leave black marks on the coated film. The addition of polypropylene wax to the coating film can reduce this tendency or make the mark easier to rub off. The use of microcrystalline wax in the ink can greatly improve the abrasion resistance of the ink.

3, anti-blocking. Some workpieces, such as wooden or metal objects, often need to be stacked in a short period of time after painting, and advances in printing technology also require inks to avoid smearing prints. Polyethylene can prevent adhesion and contamination caused by accumulation and overlap of production or printed matter.

4. Anti-settlement, anti-sagging and thixotropy. Orientation of metallic pigments. Polyethylene dispersed in aromatic and aliphatic solvents can increase the anti-settling properties of coatings and inks, while also exhibiting varying degrees of thixotropy, anti-sagging and orientation to metallic pigments.

Polyethylene wax can be added to coatings and inks in many ways:(1) Slurry and micropowder slurry are pre-dispersed forms of polyethylene wax in solvents, which are convenient to add. Micropowder is a widely used form. Various brands of wax powder are suitable for different varieties and requirements of coatings and inks, and can be selected according to the physical and chemical properties and particle size distribution of the wax. 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. Particle size refers to the diameter of the particle and its distribution in microns, the shape and surface state of the particle, etc. (2) Emulsion, dispersed emulsion is a stable dispersion state of wax in water, the particle size is usually below 1 m, below 200nm, and it is usually transparent or translucent. The particle size of less than 1 m is called dispersion or micro dispersion. The water dispersion makes the application of polypropylene wax in waterborne acrylate and polyurethane coatings and inks extremely convenient.


Key words:

Polypropylene wax