Wax can play a role in all processes of powder coating curing. Whether it is extinction or improving the performance of the film, you will think of using wax at the first time. Of course, different kinds of wax play different roles in powder coating.

PE wax for powder coating

The function of wax in powder coating
Wax is divided into emulsion form, flake and micronized wax. There are pure natural wax, modified natural wax, semi synthetic wax, synthetic wax, etc. It is mainly used for polymer modification and synthetic wax, and it is solid. Such as polyolefin wax, and polytetrafluoroethylene wax (PTFE wax), etc.
However, its appearance in the coating can be roughly divided into the following three types:
1. frost effect: when the melting point of the selected wax is lower than the baking temperature, the wax melts into liquid during baking, and after the film is cooled, a thin layer of frost like is formed on the coating surface.
2. Ball shaft effect: this effect is that the wax is exposed from its own particle size close to or even larger than the coating film thickness, so that the scratch resistance and scratch resistance of the wax can be displayed.
3. Floating effect: regardless of the particle shape of the wax, the wax drifts to the surface of the film during film formation and is evenly dispersed, so that the top layer of the film is protected by wax and shows the characteristics of wax.
4. improve the smoothness of powder
Basically, each wax powder has the effect of improving the powder smoothness and increasing the stability of the coating storage. Generally, the cost is considered. The dosage of the formula is 0.2-0.5% (WT). The wax powder selected is popular. It is necessary to note that the influence of the low-grade wax production process and impurities on the powder coating cannot be ignored. More importantly, when adding some kinds of wax formula, when baking, the odor and smoke are especially large, which is not conducive to environmental protection and safety. In addition, the raw material of a small amount of wax is not easy to stick to the cooling roller after extrusion.
Polyethylene wax for Sainuo powder coating
1. For pigments, fillers have good dispersion properties.
2. Good leveling.
3. No yellowing.
4. Scratch resistance, high hardness, good dispersion performance, and good dispersion effect on inorganic pigment fillers.
5. Control gloss
6. chemical resistance
Due to the floating effect of wax, a compact oil bearing layer is formed on the surface of the coating, so the boiling water resistance is better, and the salt spray resistance is superior.
7. Wear resistance, scratch resistance
Wax is distributed on the film surface to protect the film, prevent scratches, and provide wear resistance. Propylene modified wax and polytetrafluoroethylene wax are generally added, which is especially effective for dark plane formula and low gloss sand pattern formula.
8. Control friction coefficient
Generally, the low friction coefficient of wax is used to provide excellent smoothness of the film. At the same time, it has a special soft touch of silk due to different kinds of wax. Similarly, due to its non wettability to other coatings, anti pollution coatings can be prepared. On the contrary, when considering the recoating property of powder coating, if the surface is not easy to wet, the powder is not easy to powder.
8. Control friction coefficient
Generally, the low friction coefficient of wax is used to provide excellent smoothness of the film. At the same time, it has a special soft touch of silk due to different kinds of wax. Similarly, due to its non wettability to other coatings, anti pollution coatings can be prepared. On the contrary, when considering the recoating property of powder coating, if the surface is not easy to wet, the powder is not easy to powder.
9. Reduce particles and resist fingerprints
People have the following problems when producing metal containing powder, pearlescent powder and other powders:
(1) When the amount of metal powder is increased, the powder will have particles and the charged amount will be reduced. After adding a certain amount of post mixed wax, this effect will be significantly improved.
(2) Because the silver flash formula is sensitive to human hand sweat after being used for a period of time, it will lose light, and the fingerprints on the surface cannot be removed. After adding a small amount of wax powder and mixing, it will be improved.
10. super thin coating additive
The coating thickness of ultrafine powder is thin, which has bright prospect. But for the non-uniformity of spray and the poor powder ratio, the powder loading rate can be balanced by adding special additives, especially the homogeneity of the coarse and fine powders. This additive is a small amount of special wax powder loaded on the existing post mix (such as alumina, etc.).
11 sanding agent
Sanding agent is a kind of substance that makes the powder basically non leveling or insoluble in the curing system. Teflon wax is generally used,. Generally, the price is expensive, but the amount is small, and the texture has a strong three-dimensional sense. The other is polyolefin modified wax. In the selection of sanding agent, in addition to the chemical composition and dosage to control the size and depth of sanding, the particle size distribution and dispersion ability of micro powder wax are also important. In addition, when adjusting the formula, the amount of leveling agent also has an impact on the texture of raw materials with high oil absorption value, such as organic bentonite, quartz powder, gaseous silica, etc.
12. Application of UV curing powder
When 4.0% PTFE wax is added to the formula during UV curing, the gloss of the film will be reduced to 19, and a film with coarse grain effect can be obtained.

The initial application of wax in powder coating is to improve the surface properties of the film, mainly including improving the smoothness, scratch resistance and waterproof of the film. Later, it was used to affect the rheological properties of the coating, such as degassing, improving leveling and extinction ability, and changing the surface state of the coating. Now, people pay more and more attention to the wax with multi-functional performance combination. The influence of wax on the bind system and the modification of the film has also aroused great interest.
With the continuous development of powder coating research, people will have a further understanding of wax. Wax will be more and more widely used in powder coatings.
The main functions of wax powder additives are: increasing coating hardness, wear resistance, defoaming, extinction, improving extrusion efficiency, etc. The wax powder used for powder coating is divided into polyethylene wax, polypropylene wax, polytetrafluoroethylene wax, polyamide wax, etc. In terms of compatibility and cost performance, polyethylene wax is good and can meet the general requirements for hardening and scratch resistance, so it has a wide range of application. In terms of hardening and scratch resistance, PTFE wax is the best, and the price is also on the high side.
In addition to coating hardening and scratch resistance, some wax powders also have a certain degree of matting. For example, polypropylene wax can be used as a substitute for matting agent in powder coatings with low requirements for matting effect. However, at this time, the dosage is generally greater than 2%, and sometimes there are obvious wax particles precipitated from the film.
In the application, the wax powder is mostly compound, and there are also two application methods: pre addition and post mixing. The post mixed wax is micro powder wax with small particle size, and large particle wax should be mixed and extruded with raw materials.
The production of polyethylene wax with less than 1% can be increased and mechanical wear can be reduced when extrusion. Especially in the case of more fine powder, the effect is obvious.
Qingdao Sainuo Chemical Co.,Ltd. We are manufacturer for PE wax, PP wax, OPE wax, EVA wax, PEMA, EBS,Zinc/Calcium Stearate…. Our products have passed the REACH, ROHS, PAHS, FDA testing. Sainuo rest assured wax, welcome your inquiry! Website：https://www.sanowax.com

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