Application of curing agent in epoxy resin industry

18-06-2020

Application of curing agent in epoxy resin industry

Many users will ask merchants to distribute more curing agent when buying epoxy floor paint, because they feel that as long as more curing agent is put in, the curing speed of epoxy floor can be accelerated, thereby shortening the construction time. In fact, this is an unrealistic approach. On the contrary, when more curing agent is added, the curing speed is actually slower, and there may even be cases of non-curing. Why is this?

Due to the deviation of the literal understanding of the "curing agent" of epoxy paint, many people will understand the curing agent as an auxiliary agent to help the epoxy resin cure. As long as the curing agent is added, the epoxy resin will be cured into a floor, as long as If enough curing agent is added, the curing speed will be faster. This understanding is wrong!

If we name the curing agent "epoxy floor paint curing reaction agent", we can clearly understand the relationship between curing agent and epoxy resin. As the name implies, the curing agent is a preparation that participates in the curing reaction. The difference is that the curing agent is a constituent substance that participates in the curing reaction. It is an indispensable part of the film formation of the epoxy floor paint and cannot be simply understood as promoting auxiliary agent for curing.

The reaction process of epoxy resin and curing agent is a process of chemical reaction. After the epoxy resin is evenly mixed, the hydroxyl group in the resin will first be opened from the closed state, and then recombined with the hydrogen-oxygen bond in the curing agent to form a new closed loop. This new closed-loop cross-interconnection forms a solid three-dimensional structure. The new structure is in a very stable state. This state gives the epoxy floor paint strong mechanical properties and chemical resistance, which is good for daily damage or chemical resistance.

The curing agent plays the role of promoting curing in the whole process, and at the same time it is an important part of the final paint film after curing. If it is simply understood as an accelerator, then there is no way to explain how the epoxy resin reaches the liquid state. The process of conversion to curing cannot explain why the epoxy paint film after curing can have such a high strength.

What happens if the curing agent is added too much or too little?

Since the curing process is a chemical reaction process, there must be a problem of the ratio of the quality of the reaction components. Only when the epoxy make resin and the curing agent reach the equilibrium state can the curing reaction be sufficient and appropriate. We can imagine that the number of ring-openings formed during the reaction is fixed, then the corresponding curing agent oxyhydrogen bond is needed to link, this relationship locks the ratio of the two sides of the reaction.

When there is too much curing agent, the ring-opening epoxy resin has been linked with enough curing components. The extra curing agent cannot find more ring-opening resin, so it can only be free in the epoxy resin in its original state in the paint film, when the curing agent is too little, the epoxy resin also cannot find the curing component that can be linked, so it can only be free in the paint film. This is usually the case that cannot be cured. Too much or too little curing agent will affect the film formation quality.

In addition, uneven stirring is also a serious problem affecting the curing reaction.

Many users still fail to cure after construction according to the manufacturer's matching materials. This is a typical case of uneven mixing. The good reaction between the resin and the curing agent requires the two materials to be properly mixed together. When the mixing is uneven, the two paint liquids cannot be well fused, and the materials that are not in contact will not react, so they can only maintain their original liquids. In the state, it means that the paint can't be dried, or it can handle the sticky state for a long time.

Speaking of which, it is estimated that everyone can understand the effect of the curing agent on the epoxy floor paint! The curing agent is definitely not used to cure faster, but on the contrary, it will not only cure not fast, but also make the drying very slow or unable to dry. When using, the user must strictly follow the proportion of the manufacturer's formula, and must be thoroughly mixed and mixed before use, so as to ensure that no curing problems will occur during use.

Puyang Huicheng specializes in the production of epoxy resin curing agents. Its main products are tetrahydrophthalic anhydride, hexahydrophthalic anhydride, methyltetrahydrophthalic anhydride, methylhexahydrophthalic anhydride, nadic anhydride, methyl nadic anhydride, etc. Always adhering to the principle of customer needs first, ensuring quality and ensuring long-term stable supply, it has become the largest domestic production base of high temperature resistant curing agent.

 


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