Polymercaptan modified curing agent for rapid curing at low temperature


Structural adhesive is an indispensable material in crack repair and reinforcement. The normal work of structural adhesive is the basis to ensure that the reinforcement material and the base material work together and bear the force, which has a direct impact on the cured material.

The structural adhesive needs to be cured to play its role, and the normal curing of structural adhesive and the good or bad curing effect are related to many factors, so we should pay attention to them in construction.

environmental factor


The factors affecting the curing of structural adhesive are curing temperature. Temperature not only affects the curing speed of structural adhesive, but also affects the curing degree of structural adhesive.

If the temperature is too low, the colloid will be cured slowly, incompletely or even not. Therefore, proper heating is required to ensure normal curing.

However, when the temperature is too high, the curing reaction speed of structural adhesive will rise rapidly, resulting in too fast curing speed affecting the construction time and curing strength. Therefore, curing of structural adhesive has strict requirements on temperature, which must be controlled within a certain temperature range.

Another environmental factor affecting curing is the humidity of the environment. When the environment of reinforcement construction is too wet, it will lead to slow curing of structural adhesive. On the other hand, when the moisture content of the substrate surface is too high, it will affect the bonding surface between the structural adhesive and the substrate, leading to a significant decline in the bonding effect, leaving a potential safety hazard for the cured product.


Construction factors


Before the reinforcement construction, the surface of the base material needs to be polished. The dust generated by the polishing treatment is easy to attach to the concrete surface. If the construction is carried out without cleaning, the bonding performance will be affected.

When there is dust, scum and dirt on the surface of the substrate, the bonding effect of structural adhesive will also be greatly reduced. Therefore, the reinforcement construction cost must be thoroughly cleaned.

The curing and bonding effect of structural adhesive during construction is also affected by the gel curing pressure. In the reinforcement of bonded steel and carbon fiber board, it is necessary to apply pressure to the vertical direction of the bonding surface after the bonding is completed. This is to improve the wetting and diffusion capacity of the colloid, ensure that the adhesive layer can closely contact the substrate to avoid pores and cavities, and make the thickness of the adhesive layer more uniform. The application of curing pressure can play the role of viscosity of colloid, prevent sagging and extrusion, reduce the thickness of adhesive layer and cause material waste.

When selecting structural adhesive, we should consider the thixotropy of the colloid. If the thixotropy is not good, it will fall during construction, and the colloid strength cannot be guaranteed.

Recommended by Green


In view of the above product performance requirements for temperature, viscosity, curing speed and flexibility, Green has prepared a series of high-end epoxy curing agents with excellent performance in all aspects by modifying polysulfan. They can provide structural adhesives, adhesives and repair materials with excellent performance.

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