I.Definition The emulsion is a colloidal system with a particle size of 0.1~10μm formed by two insoluble liquids through the action of emulsifier. Secondary dispersion refers to a colloidal system formed by particles (or molecular groups) less than 1μm are dispersed into a continuous phase (such as water) under the action of a stabilizer. By definition, the formation of emulsions and secondary dispersions requires a certain stabilizer or emulsifier. II. Stability Both emulsions and secondary dispersions are stabilized by stabilizers or emulsifiers to keep droplets or particles stable, but their stabilization mechanisms are slightly different. Secondary dispersions are generally more stable because they have a smaller particle size, exhibit a larger surface area in a continuous phase, and generally require fewer stabilizers. The stability of the emulsion depends on the size and distribution of the droplets, and more emulsifiers are needed to maintain stability. III. Application Fields Due to their differences in stability and composition structure, emulsions and secondary dispersions are also different in the field of application. Emulsions are usually used in cosmetics, emulsions and coatings, while secondary dispersions are more commonly used in drug delivery, nanocrystal growth, dye transport and other fields. IV. Summary In summary, the difference between emulsions and secondary dispersions is mainly reflected in their definition, stability and application field. Although they are different in the formation mechanism and application scope, they are all colloidal particle systems, and they can play a very good performance and effect in applications.

1.Type: There are three main types of water-based acrylic resins, including emulsion, water dispersion and aqueous solution. The emulsion is synthesized by emulsifying olefins in water under the action of water-based free radical initiator. The aqueous dispersion is synthesized by free radical solution polymerization or stepwise solution polymerization. Aqueous acrylics are directly soluble in water. 2.Features: Water-based acrylic resin has excellent weather resistance, good adhesion and fast drying speed. These properties make it widely used in coatings, adhesives, printing inks and textile auxiliaries. In addition, it also has good adjustability, and can adjust its performance by diluting, toning and adding fillers to meet different application needs. 3.Advantages: The biggest advantage of water-based acrylic resin is its environmental protection, the use of water instead of organic solvents, reducing environmental pollution and harm to the human body. In addition, it also has alkali thickening effect and good stability performance, and the reasons and influencing factors of these properties are also key factors in research and production. 4.Use: Water-based acrylic resin is suitable for industrial and decorative coating, providing anti-fouling, anti-fading, anti-chalk, water resistance and other functions. When selecting water-based acrylic products, it is necessary to consider their characteristics, advantages and how to match with solvent-based acrylic products to ensure the best application effect. Sinograce Chemical manufactures a variety of water-based acrylic resin emulsions for industrial coating and architectural coatings.

Architectural coatings mainly use water as a dispersing medium and diluent, and its advantages are that the water of the dispersing medium is non-toxic and harmless, manufacturing and storage and transportation without the danger of explosion, no pollution to the environment, and to solve the problem of excessive VOC(volatile organic compounds) of solvent-based coatings at normal temperature. Film forming agent is an important component material of architectural coating products, it can improve the production process, improve product performance, improve paint construction performance, reduce environmental pollution, and develop new special functions of coatings. Although the relative proportion of most auxiliaries used in coatings is not high, they often play a very key role in improving and improving the performance of coatings and coatings, so they are more and more valued by the industry. Film forming additives, also known as coagulants and coalescing agents, are usually high boiling point solvents. The film forming agent acts as a "temporary" plasticizer to reduce the glass transition temperature (Tg) of the polymer. Once the particle deformation and film forming process is complete, the film forming agent evaporates from the film, thus restoring the Tg value of the polymer to its initial value. Under normal circumstances, most film forming additives volatilization at room temperature lag 1-2 hours than water, therefore, film forming additives should be composed of a slower volatile solvent. As a film forming agent, the biggest prerequisite is that during the drying process, the water volatilizes, and the film forming agent remains in the coating, and it volatilizes from the coating. Latex commonly used in coatings has a lower glass transition temperature (Tg). Such as VAE emulsions at about 3 ° C, therefore, in most temperatures above 5 ° C conditions. These emulsions can form film normally, and the addition of film forming additives plays a certain role in accelerating the drying of the film. In addition to contributing to the film forming performance, the film forming agent also has the function of reducing the freezing temperature of the coating. For example, ethylene glycol and propylene glycol can be used as antifreeze agents for coatings. In addition, the film forming additives have certain effects on the wet film properties of coatings, such as leveling, anti-hanging and color development. Sinograce Chemical is a manufacturer of film forming additives and various water-based acrylic building resins, welcome to inquire.

Flexo is a flexible, high resolution, warped letterpress plate. In recent years, flexo printing has developed rapidly in the field of printing, and its development prospects are generally optimistic. Flexographic printing presses transfer the right amount of ink to the substrate through a unique mesh roller. The appropriate use of ink is directly related to the printing production operation and printing quality, the general flexographic printing ink used is very thin, belongs to the liquid ink, from the rheological point of view is a close to Newton fluid ink, with good fluidity, viscosity is only 0.1-1Pa/s. At present, three types of inks are mainly used in flexographic printing: organic solvent inks, water-based inks and ultraviolet curing inks. Among them, water-based ink has always been a large part of flexographic printing for its environmental protection, economy and other advantages. This paper mainly discusses the printability of water-based ink and its use in flexo printing. 1.Composition and characteristics of water-based ink Like the general printing ink composition, water-based ink usually also has colorant, binder, auxiliary agent and other components. Colorant is the color substance of water-based ink, giving the ink a specific color. In order to make the printing color gorgeous, the colorant is generally selected with good chemical stability and high coloring power. The binder consists of water, resins, amines and other organic solvents. Resin is the most important component of water-based ink, usually the use of water-soluble acrylic resin, binder composition directly affects the ink adhesion function, drying speed, anti-sticky performance, etc., but also affects the ink gloss and ink transfer, amine compounds mainly maintain the alkaline PH value of water-based ink, so that acrylic resin to provide better printing effect. Water or other organic solvents are mainly dissolved resins, adjust the viscosity of the ink and drying speed; Auxiliary agents mainly include: defoamer, blocker, stabilizer, diluent and so on. Since water-based ink is a soap composition, it is easy to produce bubbles during use, so silicone oil should be added as a defoamer to inhibit and eliminate bubbles, while improving the transfer performance of the ink. The blocking agent is used to inhibit the drying speed of the water-based ink, prevent the ink from drying on the roller and reduce the paste plate. The stabilizer can adjust the PH value of the ink, and can also be used as a diluent to reduce the viscosity of the ink. Diluent is used to reduce the color of fresh water ink, and can also be used as a brightening agent to improve the brightness of water-based ink. In addition, some wax should be added to the water-based ink to increase its wear resistance. 2.The PH value of water-based ink The PH value of water-based ink is directly related to the viscosity, dryness and other printability of water-based ink. The experiment shows that the viscosity of water-b...