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What is Zinc Stearate Emulsion

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Update time : 2019-10-21 14:31:14
Zinc stearate is a white powder that is insoluble in water. There are two production methods for zinc stearate: water method and melting method. Generally speaking, the zinc stearate produced by the water method is acidic, and the molten way is alkaline.
 
 
The water method is also called a wet way. Under the condition that water is the medium, the catalyst is added to control a specific temperature and pressure. The metal hydroxide is added, the incentive to the catalyst replaces the metal ion and then replaced by the catalyst itself to the hard fat. Acid to achieve the purpose of forming a metal salt. The enzyme is subjected to subsequent processing and recycling. The stearate is centrifuged, dried, and ground to obtain an industry-standard product with a mesh number of 200-600 mesh. The water production usually has a slight excess of stearic acid, so the finished product is acidic after the reaction.
 
The melting method, also known as the dry method, refers to the direct addition of metal oxide (zinc oxide) to the molten stearic acid (of course, in the presence of a catalyst, otherwise the conversion rate of the reaction will be very long) controlling a specific temperature and pressure. And the stirring speed, the stearate, is obtained by the response. The product produced by the dry process can be reacted entirely due to the existence of the catalyst, and the metal oxide is slightly excessive so that the product is alkaline when tested.
 
An aqueous emulsion of zinc stearate is referred to as a zinc stearate emulsion, also known as aqueous zinc stearate. It can be used as a release agent, color retention agent, lubricant, release agent, etc. Appearance: white emulsion, no precipitation, stratification.
 
Zinc stearate emulsions are used in a wide range of applications in rubber, plastics, coatings, inks, paints, thermal paper, cosmetics, and more. According to market observers, it can be divided into three types: paper grade, paint grade, and rubber grade. Among them, the papermaking grade has the best quality, the coating grade is second, and the rubber grade is the worst.
 
1. Water-based paint: used for high-quality water-based paint, good transparency, fast defoaming, excellent stability, good anti-sinking, quick-drying, easy to disperse, easy to grind, improve the hydrophobicity of the coating surface, improve the paint film Feel, there are outstanding performances.
2, water-based ink: has a good economy, can be used as a flat agent, filling, stability, anti-settling, and waterproof.
3, textile products: can be used as a polishing agent to improve the hydrophobicity of the surface.
4, cosmetic products: can be used as a lubricant to enhance the smoothness of the surface.
5. Paper industry: It can be used as a waterproofing agent for waterproof surface coatings such as special paper and thermal paper.
6, sanding paper: can be used as a grinding aid to improve the surface of the grinding, anti-wear, and waterproof.
 
Zinc stearate emulsion can be used as a heat stabilizer; a lubricant; a grease; a promoter; a thickener. For example, it can generally be used as a PVC resin heat stabilizer. It is used in general industrial transparent products; it can be used together with calcium soap. It can be used for non-toxic products. Generally, this product is mostly used in soft products. However, in recent years, hard transparent products such as mineral water bottles, water pipes, and other products have been used. This product has excellent lubricity and can be used. It can improve the appearance of scale formation, and can also be used as a lubricant, a release agent, and a paint flatter, a coating additive.
 
Application of zinc stearate emulsion as a waterproofing agent in coatings
 
The development of new varieties of waterproof coatings is high performance and versatile waterproof coatings. This coating with a zinc stearate emulsion has the following features:
1. It does not change the performance and color of the surface of the treated object;
2, the surface can be colored and decorative design, the material is painted with a metallic effect;
3. Long-lasting protection against erosion by water, freezing and air pollution;
4, with self-cleaning ability, strong wind, rain can clean the surface of the treated dust, rinse with high-pressure water, will not destroy its effect; 5, the coating thickness is skinny, only 5 ~ 15μm, so the active area of ​​the coating is significantly increased, It is about 3 times that of traditional paint, which saves costs;
6, with 100% permeability, to maintain the original permeability of the building substrate;
7, improve the thermal insulation performance, with UV resistance, protect the original surface color. It can meet the needs of the market very well.
 

Application of zinc stearate emulsion as a lubricant in coatings
 
Friction can cause material wear, and the way to relieve friction and wear is lubrication. The addition of aqueous zinc stearate to the surface coating reduces the effect of the coefficient of friction and forms a self-lubricating material.
 
When the friction pairs slide against each other, the temperature rise caused by the change of the surface properties of the material affects the friction coefficient. It varies with the working conditions of the friction pair. When the aqueous zinc stearate is heated, it changes from solid-state to a liquid state, absorbs a large amount of heat, stabilizes the surface properties of the material, and reduces the friction coefficient.
 
During the rubbing process, the lubricating coating film with the zinc stearate emulsion adhered to the surface of the substrate itself has a small shear strength and is transferred to the surface of the dual material to form a transfer film, so that the friction occurs between the coating film and the transfer film. Therefore, it plays a role in friction reduction. Moreover, the lubricating coating film with the zinc stearate emulsion can firmly adhere to the surface of the substrate, and it is not easy to fall off when rubbed. The specific nanofilm can be stably and permanently provided so that the formation and consumption of the transfer nanofilm are balanced, so The lubrication condition is excellent.
 

Application of zinc stearate emulsion as wear-resistant auxiliaries in coatings
 
The wear resistance of wear-resistant coatings refers to the ability of the surface to resist friction, abrasion, and erosion, and is related to many properties of the surface, including hardness, scratch resistance, cohesion, tensile strength, elastic mode, and toughness, etc.
 
The commonly used wear-resistant coatings are polyurethanes and their modifications, epoxy, and their modifications, silicones, and their modifications. Although polyurethane elastomers are recognized as excellent wear-resistant materials, they have the disadvantages of low hardness and poor adhesion, and sometimes they cannot fully exert their performance advantages. Epoxy resins have excellent adhesion and cured rings. Oxygen resin coating film has higher hardness, but the coating is brittle; silicone wear resistance is reduced, which can not meet the needs of practical applications.
 
The zinc stearate emulsion has excellent dispersibility, strong adhesion, and active wear resistance. After being cured in the coating, it can improve the hardness and wear resistance of the layer and maintain high toughness. When added to the surface coating, the particles can be slightly protruded from the surface of the coating film, and the distribution is uniform. When the coating film is subjected to friction, the substantial friction portion is the anti-friction agent portion, and the coating film is protected from or less friction, thereby prolonging the life cycle of the coating film imparts excellent abrasion resistance to the coating film.