Water - based acrylic emulsion formulation needs to be considered: water

Water - based acrylic emulsion formulation needs to be considered: water - based acrylic resin composition

2019-08-21

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 toughness, such as polymethyl methacrylate (methyl methyl methacrylate) is commonly known as plexiglass; methacrylate monomer, because it does not contain benzene ring, it is compared to styrene Monomers have significant advantages over styrene in terms of UV resistance, durability, and solvent resistance.In summary, water-based acrylate resin manufacturers have a large selection of monomers, which can not only change their types, but also change the relative proportions and components. When choosing water-based acrylate emulsions, water-based paint manufacturers should not only consider the concept of “pure C” or “styrene-acrylic”, which should be based on the actual performance of water-based acrylate resins and their formulations.

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