Amino resin can enhance the flexibility of the paint film, make it more wear-resistant, impact resistance, and improve the weather resistance of the paint film.

The role of amino resin mechanism

Amino resin is a multifunctional polymer, with stable properties, high transparency, good hardness, water resistance and other advantages, it plays the role of crosslinking agent in the paint curing process. Amino resin and the base resin co-condensation at the same time, will also occur self-condensation reaction, so as to form a three-dimensional network structure, to enhance the mechanical strength of the paint film and chemical resistance.

Amino resin as a cross-linking agent

Amino resin as a crosslinking agent, in 100 ℃ below the degree of reaction is low, but when the temperature rises to 150 ℃ or more, the degree of crosslinking reaction is significantly increased. It is noteworthy that even at 200°C, the degree of reaction is only close to 90%, indicating that the amino resin still has good reactivity at high temperatures.

Amino resin as a crosslinking agent added to the paint, can effectively enhance the flexibility of the paint film. Its enhancement mechanism mainly has the following three aspects:

1. increase the elasticity of the paint film

2. reduce the surface tension of the film

3. enhance the adhesion of the coating

The type and characteristics of amino resin

Amino resin types are diverse, according to its structure in the different functional groups, can be divided into polymerisation type part of alkylation, polymerisation type high subamino and monomer type high alkylation, etc., can also be divided into urea formaldehyde amino, isobutylation, n-butylation, benzene substitution of amino, part of the methyl etherification and complete methyl etherification and so on. These different types of amino resins in the reactivity, crosslinking temperature and the final film properties have their own characteristics.

Ratio of amino resin to acrylic resin

Because the molecular weight of acrylic resin is large, and the molecular weight of monomer type HMMM is small, so in order to fully react, the amount of HMMM, it should be a lot of excess;

Generally is controlled in the main body resin: amino resin = (1.7: 1 ~ 4: 1), based on the higher temperature, more likely to tend to self-crosslinking, so when the temperature is higher, the amount of amino resin should be increased, generally keep in the upper limit of the ratio, so as to ensure the effectiveness of the crosslinking reaction. In addition, if the amount of hydroxyl group contained in the main resin is high, the proportion of amino resin should be increased accordingly.

Nanjing Yolatech provides all kinds of high purity and low chlorine epoxy resins, including Bisphenol A epoxy resin, Bisphenol F epoxy resin, Phenolic epoxy resin, Brominated epoxy resin, DOPO modified phenolic epoxy resin, MDI modified epoxy resin, DCPD epoxy resin, Multifunctional epoxy resin, Crystalline epoxy resin, HBPA epoxy resin and so on. And we also could provide all kinds of curing agents or hardeners and diluents.

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