Advantages and Disadvantages of Waterborne Alkyd Resin Classification Introduction of Waterborne Alkyd Resin

The information about waterborne alkyd resin recommended for everyone today tells us that it is different from common coating products. It is more environmentally friendly and widely used for the protection of general metal furniture. It is an important coating resin with low price and complete varieties. Today, it also includes the evaluation of waterborne alkyd resin and the comparison of its advantages and disadvantages. I believe you can choose a suitable and reliable coating product according to the actual situation to achieve satisfactory results and goals.

Advantages and disadvantages of waterborne alkyd resin

Waterborne alkyd resin has good weatherability, gloss, gloss retention, color retention and film flexibility, and is gradually being popularized in waterborne industrial paints. However, there are ester bonds in waterborne alkyd resin, which are easy to break when hydrolyzed by water. At the same time, the performance of the product is greatly reduced, and in severe cases, resin delamination will occur, making it unusable. In addition, the water-based drier is also easy to be inactivated in water environment, which makes the drying speed of water-based alkyd paint film decrease obviously.

Second, the classification of waterborne alkyd resin

According to the appearance of water-borne alkyd, water-borne alkyd can be divided into water-emulsified type and water-soluble type. Although their appearances are quite different, their molecular structures are basically similar.

Preparation of water-emulsified alkyd resin: firstly, the solvent-free alkyd resin (the same as solvent-based alkyd resin) was synthesized, and then in the presence of emulsifier and protective glue, water was added, and the water-emulsified alkyd resin was obtained by high-speed shear dispersion emulsification. Resin with high oil content has low viscosity, and the particle size after emulsification is often lower, so the stability of emulsion is better. When the oil content decreases, the viscosity of resin tends to increase and the particle size of emulsified waterborne alkyd emulsion increases. Emulsifiers commonly used to emulsify alkyd resins are nonionic surfactants. Generally, polyvinyl alcohol or sodium polymethacrylate is used as protective glue, and the storage performance of waterborne alkyd emulsion emulsified by emulsifier is often poor. At the same time, due to the existence of small molecular emulsifier, the performance of the product after film formation is not ideal.

Water-soluble alkyd resin has high gloss, and film-forming additives are not needed in the film-forming process. Its preparation principle is: firstly, prepare alkyd resin with a certain acid value, dilute it with hydrophilic solvent to a certain solid content, then neutralize it with organic amine to form salt, and then have water dispersion ability, and stir it while adding water to obtain a completely transparent or translucent yellow liquid. The degree of transparency is related to the acid value retained by waterborne alkyd resin. The higher the acid value, the more transparent the liquid obtained by water dispersion.

Some waterborne alkyd resins introduce carboxyl groups by introducing carboxyl monomers with three or four functional groups, such as trimellitic anhydride, and some introduce carboxyl groups by reacting maleic anhydride with conjugated acids. Compared with trimellitic anhydride method, the waterborne alkyd resin obtained by introducing hydrophilic carboxyl through Michael addition reaction of maleic anhydride and unsaturated carboxylic acid has better hydrolysis resistance.

Acrylic acid modified alkyd resin: acrylic acid modified alkyd resin is mainly grafted onto alkyd resin by (1) acrylic acid and ester monomer; (2) Acrylic acid and ester monomer are initiated to polymerize in the presence of initiator to obtain acrylic oligomer containing carboxyl, and then polyol and polybasic acid are used to replace part of polybasic acid for carboxyl polymerization to obtain acrylic acid modified alkyd resin. Acrylic acid modified waterborne alkyd resin can not only improve the hydrolysis stability of resin, but also improve the drying property of waterborne alkyd resin.

Self-emulsifying waterborne alkyd resin was obtained by polycondensation of hydrophilic polyol instead of partial polyol and polybasic acid, which avoided the use of small molecular emulsifier and was beneficial to improve the drying and comprehensive properties of the resin. The particle size of this kind of emulsion is related to the value of hydrophilic polyol and residual hydroxyl group. The larger the amount of hydrophilic polyol and residual hydroxyl group, the smaller the particle size of dispersed emulsion and the more stable the emulsion.

What I recommend above is a special coating, that is, water-borne alkyd resin. On the one hand, as a water-based coating, it is environmentally friendly. On the other hand, the special materials and components make the production and construction of this waterborne alkyd resin safer and reduce the danger of explosion and fire. Construction equipment can be washed with water, saving resources. On the other hand, they may have a disadvantage that their storage stability is poor. You might as well know two aspects and choose the market.

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