Formulation design system for waterborne coatings - film forming AIDS The polymer constituting the emulsion or dispersion generally has a glass transition temperature higher than room temperature. In order for the emulsion particles to be well fused into a uniform paint film, it is necessary to reduce the minimum film formation temperature (MFFT) of the crystallization aid.Film forming agents are a kind of small molecular organic compounds, the film forming agents in the paint film will eventually gradually escape and volatilize most of the film forming agents is an important part of coating VOC, so the less film forming agents should be used, the better.The use of film-forming auxiliaries should give priority to compounds that are not within the VOC limits, but which are not too slow in volatility and have high film forming efficiencies.The amount of coalescent aid depends on the amount of emulsion or aqueous dispersion in the formulation and the glass transition temperature.The amount of the emulsion or water dispersion is large and the Tg of the polymer is high, and the amount of the film-forming auxiliary agent is also large. On the contrary, when the dosage is small, the formulation aid is first considered to account for about the emulsion or the aqueous dispersion. %-5%, or 5% to 15% of the emulsion or dispersion solids.However, for polymer emulsions with Tg over 35  C, it may be necessary to increase the amount of coalescent to ensure the reliability of low-temperature film formation. At this time, the amount of film-forming auxiliary should be gradually increased until low temperature (about 10   C or lower). The coating can form a uniform paint film without cracking or powdering, and find the minimum amount of filming aid.It is not advisable to use a filming aid in an amount of 15% or more of the emulsion or dispersion. It should be considered to replace other filming aids and try again.In addition to lowering the minimum film forming temperature and increasing the density of the film, the filming aid can improve the workability, increase the leveling of the paint, prolong the opening time, and improve the storage stability of the paint, especially the low temperature freeze resistance. Sinograce Chemical produces water based coating,Water-based glue, polyurethane coating visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

In the formulation of waterborne wood lacquer topcoats, the binder is a key component in forming the film and determining the properties of the film. The binder, ie the polymer emulsion, dispersion or hybrid, accounts for more than 80%, preferably more than 90%.Since the solid content of the emulsion, especially the aqueous dispersion is relatively low (the aqueous dispersion is generally 30% to 35%), the amount of the base material should be increased as much as possible in the formulation design so that the effective film-forming material content in the paint liquid is as large as possible. In this way, it is ensured that the painted paint is thicker and has a high fullness. Polymer emulsions generally have a higher solids fraction than aqueous dispersions. After the solid content of the water-based base material is increased to a certain extent, the viscosity is so fast that it can be thickened to the extent that the paint cannot be smoothly produced.Since the particles in the aqueous dispersion region are small, this phenomenon is more remarkable, and it is usually only a concentration of 35% or less.Because the emulsion particles are relatively large, the viscosity of the same solid is smaller, and generally a solid fraction of about 50% can be produced.When formulating the formula, this difference should be taken into account, that is, when using a water-dispersible lacquer, it is necessary to increase the amount of the dispersion as much as possible.Which emulsion or aqueous dispersion to use depends on the purpose of the waterborne wood lacquer.Outdoor water-based wood lacquers have harsh weathering conditions, and aliphatic polyurethane dispersions or acrylate emulsions should be preferred.The interior paint can be made of an aromatic polyurethane dispersion or an acrylate emulsion, which has a high glass transition temperature or can be crosslinked during the curing process to improve water resistance and ironing resistance. There are some pigments and fillers in the water-based wood paint solid paint. The amount of emulsion or water dispersion is correspondingly reduced, generally about 70%-80%, while the putty has more fillers, and The amount of emulsion or dispersion can even be as low as 50%. The types of resins that have been successfully applied to waterborne wood coatings are mainly waterborne alkyds, acrylic emulsions or dispersions, aqueous polyurethane dispersions and aqueous acrylic polyurethane dispersions. Sinograce Chemical produces water based coating,Water-based glue, polyurethane coating visit us sinograce chemical: https://www.sinogracechem.com Get a Quote Now :sales@sinogracechem.com Telephone               :+86 0551 63459511

Water - based coating formulation design system Waterborne coatings, including waterborne wood lacquers, are water-based dispersions and diluents. Unlike conventional solvent-based coatings, the formulation system is a more complex system.When formulating, not only the type of polymer, the properties of the emulsion and the dispersion are concerned. It is also necessary to rationally select various additives and make a reasonable match in consideration of the interaction between the components.Also select some special additives according to special requirements, and finally form suitable formula.The basic components and functions of water-based wood paint are as follows: 1.polymer emulsion or dispersion: This is the film-forming binder, which determines the main function of the film. 2.Film-forming aid: After the water is volatilized, the emulsion or the dispersion particles are formed into a uniform and dense film, and the film formation property under low temperature conditions is improved. 3.Suppressing agent and defoaming agent: inhibiting the bubbles generated in the paint solution during the production process and causing the generated bubbles to escape from the liquid surface and breaking the bubble. 4.Wetting leveling agent: Improve the wetting property of the paint liquid on the substrate, improve the leveling property, and increase the adhesion of the paint film to the substrate. 5.Rheology additives:provide good fluidity and leveling of the paint, and reduce the defects in the painting process. 6.Surface Control Aid: Improve the performance of the film. 7.Matting agent: regulates the gloss of waterborne wood coating. 8.Preservative: Prevent the paint from becoming moldy during storage. 9.pH adjuster: adjust the pH of the paint to stabilize the paint. 10.Colorants and fillers 11.Special additives In addition, the formulation is often designed to add a small amount of deionized water to make paint. Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.

The basic principles of the following waterborne wood paint formulation design The amount of the emulsion or the aqueous dispersion is as much as possible because the material of the emulsion is mainly composed of a polymer material which is a backbone for ensuring the final film properties; The additive are as few as possible, and they can be used without being used. These additive will be present in the film in a free state after film formation, which will inevitably affect the mechanical properties of the film; The amount of pigments and fillers is preferably as small as possible, as long as the purpose is achieved, the less the better, the introduction of these materials necessarily means the introduction of grinding aids, thereby affecting the film properties. Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.