What are the applications of zinc stearate emulsion in coatings?

Zinc stearate is a "zinc soap" widely used in modern industry. In this case, soap is used in its formal sense, a metal "salt" of fatty acids. It is a white solid that repels water. It is insoluble in polar solvents such as alcohol and ether, and soluble in aromatic hydrocarbons (such as benzene) and chlorinated hydrocarbons when heated. Zinc stearate is the strongest release agent among all metal soaps. It contains no electrolytes and has a hydrophobic effect. Its main application area is in the plastics and rubber industries. It is used as a release agent and lubricant and can be easily added.

Zinc stearate emulsion is mainly used in wood coatings to fill and improve sanding. This kind of paint has excellent permeability, which affects the permeability of the color, and is especially suitable for transparent primers. In addition to focusing on abrasiveness and transparency, zinc stearate emulsion also has some other influencing factors, such as oil absorption, thickening, particle size and dispersion, which will also affect the overall performance of the wood paint.

There are several technical indicators of zinc stearate emulsion in the wood primer that affect the performance of the paint

1. Grinding

Inwood primer, sanding performance, is an indispensable index in paint. The usual test method is to use the same paint formula and polish the spray plate at the same time. There is no fixed standard. If only one paint manufacturer's zinc stearate emulsion is used, it does not matter whether the abrasiveness is good or not. Nevertheless, market competition has led to product comparisons and also stimulated the further development of zinc stearate emulsion grinding aids. The quality of sanding performance directly affects the construction speed, affects the frequency of sandpaper replacement, and directly affects the cost of furniture manufacturers. Generally, the proportion of zinc stearate emulsion in the primer is 5-10%. Still, some white textbooks that do not require high abrasiveness and low cost also do not contain zinc stearate emulsion and add a lot of talc. And calcium carbonate to improve quick-drying and sanding properties. For the grinding of zinc stearate emulsion, the manufacturers are not necessarily the same, and the grinding performance of different materials from the same manufacturer may be slightly different. For example, if the acid value of the semi-finished product produced is somewhat different from the temperature during synthesis, it will more or less affect the finished product. Therefore, in the production of zinc stearate emulsion, not only the process must be stable, but also the process must be continuously improved to improve the grinding performance of the zinc stearate emulsion.

 2. Transparency

In the transparent primer, the transparency directly affects the beauty of the wood. Therefore, zinc stearate produced by the water method cannot be used for transparent wood lacquer, mainly because of excessive impurities. Direct production of zinc stearate can meet the requirements in terms of purity, but the requirements for the process are also very high. Different production processes have a major impact on transparency. Small differences in the process can lead to huge differences in transparency. Therefore, although many manufacturers directly produce zinc stearate, it is rarely used in the coating industry. This is also the core technology of zinc stearate coating enterprises. Transparency detection usually involves dispersing a certain proportion of resin, solvent, zinc stearate, sample, and standard sample.

3. Thicken

Paint manufacturers do not accept the thickening of zinc stearate emulsion. Because zinc stearate emulsion is added to the surface to make finished products, the viscosity is determined, and the factory specifications are fixed, even if the error is ±500mP·s, the method of testing the thickening of zinc stearate emulsion is generally to use a rotary viscometer. Experimented. If the viscosity of the dispersion just dispersed after a few hours exceeds 500 mP, it is considered thickened. If the zinc stearate emulsion is thickened, the finished product test produced by the paint manufacturer will be very different from the one used. Even if the viscosity required to produce the paint is relatively large, the zinc stearate emulsion is thickened, so it may Causes the paint to flow completely,

4. Oil absorption

Oil absorption and thickening are not the same concept. Under the same addition ratio, the oil absorption is significant, and the finished product has a large viscosity. The thickness within a period of time does not exceed the error value ±500mP·s. The test standard for oil absorption is "DIN ENISO787-5-1995". Generally, PU coatings do not have high requirements for oil absorption, because they will not have much impact on production, and paint manufacturers have relatively high requirements for oil absorption. This may be because some paint manufacturers add more solvents, but if you want to reduce the volatilization of water, you need to find some substances with high oil absorption. The oil absorption of zinc stearate emulsion is higher than other additives. Auxiliary.

5. Granularity

Particle size is an indicator of the size of zinc stearate particles and is generally measured by fineness. Usually, testing is the easiest. The fastest result is the fineness of the scraper. Generally, a certain proportion of zinc powder is added to the alkyd resin. Then add a little solvent to adjust the viscosity, and then test with a spatula. Because the resin-coated powder occupies a certain thickness, the test result will be slightly larger than the actual fineness. Nevertheless, as long as the standards are comparable and repeatable, testing methods can be used to measure whether the fineness exceeds the standards. In the paint, the fineness of zinc stearate should not be too large, which will cause the effect of the spray plate to have particles on the surface of the plate, and unevenness will appear if some places are not polished.

6. Scatter

In the production process of coatings, many manufacturers have also mentioned the problem of dispersion. In general, there is no problem with the dispersion of zinc stearate emulsion in color. Nevertheless, in the production process of zinc stearate emulsion, some indicators will also have a certain impact on the dispersibility, such as stearic acid. The acid value of zinc is too high, the temperature of the semi-finished product is too high, and the worker presses the bag too hard, which will cause the problem of poor dispersion of zinc powder in the coating. At the same time, if the moisture in the zinc powder is too high, crystallization problems may occur. The dispersion is not good. Similarly, zinc stearate emulsion solves these problems well.

Overview of zinc stearate emulsion

Water-based zinc stearate is mainly used to replace filter paper, sandpaper super coating, thermal paper sensitizer, rubber release agent, water-based paint functional additives, etc. Since zinc stearate is insoluble in water, it works through the dispersion of particles in water. The size of the system used will directly affect the dispersion effect of the active ingredients. Water-based zinc stearate mainly uses zinc stearate special additives, sandpaper polishing paint, thermal paper sensitizer functional additives, rubber and water-based paint release agents, etc.

Because it is insoluble in water, it disperses and interacts with particles in the user's system. Therefore, the larger youth breakthrough agent directly affects the dispersion effect of the active ingredients. The common water-based acid resin zinc acid particles have large particle size and small particle size, which is not easy to disperse. The micronization of zinc stearate is difficult to achieve with technology, and zinc stearate is also a substance that is difficult to emulsify. Therefore, zinc stearate is generally used as an injection in the paper industry.

Application of zinc stearate emulsion

Zinc stearate emulsion can be used as a heat stabilizer; lubricant; grease; initiator; thickener. For example, it can generally be used as a heat stabilizer for PVC resin. Used for general industrial transparent products; can be used with calcium soap. Can be used for non-toxic products.

Zinc stearate is commonly used as a release agent, heat stabilizer and lubricant in the plastics, polyolefin, polystyrene and rubber industries. Zinc stearate is also used as a polishing additive in wood coatings (lacquer). In cosmetics, zinc stearate is a lubricant and thickener that can improve texture. Zinc stearate emulsion has a wide range of uses, including rubber, plastics, coatings, inks, paints, thermal paper, cosmetics and other industries.

1. Application in rubber industry: release agent, release agent, active agent, etc.

2. Application in the plastic industry: internal release agent

3. Application in the coating industry: color retention agent, filler, etc.

4 Application in plastic industry and coating industry: grinding aid

5. Application in cosmetics industry: lubricant

It is also used in the coating industry and sandpaper industry.

Price of zinc stearate emulsion

The price of zinc stearate emulsion will vary with the production cost, transportation cost, international situation, exchange rate, and supply and demand of zinc stearate emulsion. Tanki New Materials Co.,Ltd. aims to help various industries and chemical wholesalers find high-quality, low-cost nanomaterials and chemicals by providing a full set of customized services. If you are looking for zinc stearate emulsion, please feel free to send an inquiry to get the latest price of zinc stearate emulsion.

Supplier of zinc stearate emulsion

As a global supplier of water-based zinc stearate emulsion, Tanki New Materials Co.,Ltd. has extensive experience in the performance, application and cost-effective manufacturing of advanced engineering materials. The company has successfully developed a series of powder materials (including oxides, carbides, nitrides, single metals, etc.), high-purity targets, functional ceramics and structural devices, and provides OEM services.