The internal structure of waterborne acrylic emulsion particles will affect several aspects of waterborne paint formulations.According to the order in which the effects are affected, the phase structure will first affect the selection and addition of the filming aid.Different phases have different hydrophilic/lipophilic characteristics, and the oleophilic properties of various coalescents are different. For example, dipropylene glycol methyl ether (DPM) is more hydrophilic than dipropylene glycol butyl ether (DPnB). Low oiliness.If the outer layer of the aqueous acrylic emulsion particles is a very lipophilic phase, the addition of DPM is not only ineffective for film formation, but also causes excess DPM to be free in water to affect other properties of the water based paint film. Another effect of the phase structure on the aqueous paint formulation is the effect on the film quality of the waterborne paint film.The key to film quality is that during the fusion of the aqueous acrylic emulsion particles, the phases that need to be mixed are thoroughly mixed, while the phases that need to be separated remain separated.If different phases are required to participate in the fusion, a mixed filming aid should be chosen for best results. Many domestic and foreign literatures on aqueous acrylic emulsion polymerization mostly mention the structural problems of various emulsion particles such as core shell. For example, various structures such as nuclear shell, half moon, multinuclear, hollow, and strawberry have been reported.While the description of these structures is useful for understanding the complexity of aqueous acrylic emulsion particle structures, the structure of aqueous acrylic emulsions is actually much more complicated.For example, only emulsions of single phase structured particles are absent. Particles in practical aqueous acrylic emulsions are distributed in a variety of structures, possibly with more core shells, possibly more strawberries, and the like.Waterborne acrylic emulsion manufacturers control the phase structure of aqueous acrylic emulsions by the choice of monomers, the order of addition, the amount of surfactant used, and the like. Since the phase structure of a typical aqueous acrylic emulsion is a technical secret of the emulsion manufacturer, this information is generally not disclosed.However, suppliers will provide recommended additives and ratios for their supplied acrylic emulsions. This is often the case for different aqueous acrylic emulsions that require different combinations of additives. Sinograce Chemical produces water-based acrylic coatings for various water-based coatings visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

Water - based acrylic emulsion formulation needs to be considered: water - based acrylic resin composition The choice of emulsion raw materials is the most important decision for engineers when formulating aqueous paint formulations.The main properties of the coating are determined by the resin.A wide variety of water-based acrylate emulsions, including polystyrene-acrylate emulsions, are on the market. Different aqueous acrylate resin compositions have a great influence on the film-forming properties and cost of the water-based paint.Here are a few simple discussion of the influencing factors. 1.Main ingredients： a.The main reason why styrene: polyacrylate emulsions are introduced into the monomer is that it can provide a higher glass transition temperature (Tg), thereby increasing the hardness of the film formation; another reason is cost.Styrene is used in the packaging industry and is one of the most important and mature downstream products in the petroleum industry. It is low in price but highly affected by the macro economy.However, the introduction of styrene, especially when it is more than 15% of the total monomer amount, also has many negative effects on the water-based paint film-forming property.First, the styrene-containing polymer segment lacks flexibility, macroscopically, the water-based paint film is hard and not tough; and the benzene ring contained in styrene is an ultraviolet light absorber. When the monomer content is high, The ultraviolet light passes through the adjacent benzene ring to shear the polymer chain, so that the water-based paint film becomes brittle, the gloss is decreased, and the life is reduced; the structure of styrene also determines its affinity for many organic solvents, water-based paint. The solvent resistance of the paint film is also significantly different from other resins. b.Acrylate monomers: There are many types of acrylate monomers, and the performance and price vary greatly.The most commonly used in China is butyl acrylate, which has the lowest cost. It is the monomer used by most emulsion manufacturers to match the styrene and make the emulsion of cheap wall paint. Its function is to provide the flexibility of the water-based paint film.Since the acrylate polymer main chain does not contain a group other than the ester group, the main chain and the ester group side chain are both flexible, so that the water-based paint film lacks hardness. Although this type of polyacrylate emulsion is the choice of interior and exterior wall coatings, performance is not enough as a wood lacquer with high hardness and toughness requirements. c. Methacrylate monomers: Methacrylate monomers, which are a step further in performance than acrylate monomers.Since the methyl group has a methyl group on the main chain, the activity of the main chain is restricted, the main chain is strengthened, and the ester side chain provides flexibility, so that the methacrylate type The body has the best balance of hardness and t...

Adding certain kinds and dosages of substrate wetting agent and adhesion promoter to the transparent base formulation helps to improve the adhesion of the paint film; the type and quality of the color paste are not only related to the phase of the color paste and the transparent base. Capacity also has a certain influence on the adhesion of the paint film. The thickness of the paint film, the drying time of the paint film, and the temperature and humidity of the paint curing environment are all important factors affecting the adhesion of the water-based glass paint film.From the viewpoint of the adhesion mechanism of the paint film on the substrate, the polarity of the paint film and the surface to be coated, the cohesion and thermal expansion coefficient of the paint film, and the wettability of the paint liquid to the substrate,Theoretically, the quality of the paint film adhesion performance is determined. Sinograce Chemical produces wetting agent and tackifier for all kinds of waterborne coatings,Welcome to consultation. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

Wettability of paint to substrate The adhesion of the paint film is caused by the mutual attraction between the paint and the polar groups on the surface of the coated substrate, and the mutual attraction between the polar groups is based on the premise that the paint is well wetted on the surface of the coated substrate.Since the wet condition of the coating on the surface of the coated substrate depends on the surface tension of the paint liquid, the surface tension of the paint is lowered to improve the wetting efficiency and enhance the adhesion of the paint film to the surface of the substrate. The wetting of the substrate by the coating is achieved by the flow of the coating.The paint liquid must have a good flow dynamics in the application, even if the powder coating must reach the flow dynamics; the coated surface can only be wetted by the flow of the paint liquid, in order to achieve the purpose of good adhesion of the paint film to the substrate.In general, the coating is not wet well, the interface contact is small, and the adhesion is poor; on the contrary, the coating is wet well, the interface contact is large, and the adhesion is good. When low-molecular-weight substances or additives (such as stearates, plasticizers, etc.) are present in the coating, they will form a weak interfacial layer between the coating and the object to be coated, which will affect the flow of the paint to the substrate. Moisture, reducing adhesion.In addition, when the surface of the substrate is adhered with impurities such as water, dust, acid, alkali, etc., it also causes the appearance of a weak interface layer between the paint film and the substrate, hinders the wetting action of the paint liquid on the substrate, and reduces the polarity point. , resulting in a decrease in the adhesion of the paint film. Sinograce Chemical hasproduces chemical additives,semi-finished varnish coating, Acrylic Industrial Coatings, welcome to consult us. visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511