Two-component coating crosslinking agent

Two-component coating crosslinking agent,To get the best performance, the film diffusion velocity of polymer must be greater than the crosslinking curing speed. As is known to all, two-component coating, crosslinking agent to mix before use.

New concept is the preparation of a known as the single packing of two-component coating (two - pack - in - one - pot), its meaning is a functional group of two sets of points are incompatible or limited compatibility, but both are latex or with water medium, the mixture of two component functional groups will not contact, so, won't response in front of the paint film is dry. After the evaporation, functional group, can effective and rapid crosslinking reaction. Crosslinking agent for formaldehyde release a quantity to low, low crosslinking temperature, crosslinking speed, environment friendly.

Two-component coating TWN a} mponent ccntir}. Also called double packing paint or two cans of paint (two package co: stings; double package coatings). Refers to the two separate packing, components before use to mix two components in exact proportion to curing film coating. Two components mixture must be more than in a limited time period to gel, become a waste, can no longer use, this paragraph of time limited, referred to as the activation period or activation of life.

The formation of shrinkage cavity clean itself and substrate coating has a problem. But because of the paint itself has a low surface tension of the droplet, or because of the pollution on the coating surface with low surface tension, surface tension caused by uneven, coatings under the action of surface tension difference, from low to high surface tension in surface tension, the result is a center concave hole, shrinkage cavity.


We will be uneven as the surface tension of shrinkage cavity formation of the internal cause. In fact, some properties of the coating itself, such as paint viscosity, thixotropy, paint and coating thickness, drying speed can be increased or reduced coating fluid flow capacity, which would increase or decrease the degree of shrinkage cavity, we will these factors as external cause of shrinkage cavity. Internal cause is the necessary condition of shrinkage cavity, external cause can appropriate control or aggravate the degree of shrinkage cavity.



Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine Raw material ：

TDA industrial, Sichuan production

Ethylene (Et) polymer grade, Shanghai production

TEA industrial imports

A reagent grade additives


Prevent shrinkage cavity, for coating is to improve the resistance to shrinkage cavity, for substrate by surface treatment to reduce the wetting tension, improve coating of shrinkage resistance mainly is to reduce the surface tension of the film forming matter. Coating containing surfactant molecule retraction will occur, because the molecules in a very strong polarity will rapid orientation of the surface of the substrate.

In this case, even if the paint than the surface tension of the substrate is small, but when the surfactant on the surface of the substrate orientation, the surface tension of the coating are still larger than the substrate. The generation of this kind of phenomenon is because of the surfactant polar groups on the surface of the substrate at the end of the association, after coating and coating must be wetting is formed by the surface polarity end.

Improper selection of defoaming agent can also lead to shrinkage phenomenon. Defoaming agent is less than the surface tension of the defoaming, the surface tension of the liquid in the foam system solubility is small, as far as possible with good dispersion. Can't with other substances in the system response, does not affect the fillers and the stability of the emulsion, have very strong proliferation ability, does not influence the performance of the coating.

The compatibility of defoaming agent and the system is too bad, and antifoaming agent dispersed bad in the system, in the form of large droplets exists in coating system, or the coating during the construction of water dilution, defoaming agent in the form of droplets, the defoaming agent small droplets and droplet surface tension around, from the low surface tension to the high surface tension coating diffusion, cause droplets around the coating layer thickness in droplet place below, coating surface depressions, big and small.

Defoaming agent usage or improper, orange peel, can also lead to film coating burnish drops. Shrinkage cavity under a magnifying glass is pure oil bead belongs to defoaming agent and poor or poor dispersion of system compatibility, shrinkage cavity center under a magnifying glass is oil powder mixture, the surface of the oil or center with powder particles, oil, the oil powder mixtures of low surface tension is the fundamental cause of shrinkage cavity.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

Diethyl toluene diamine(DETDA)  http://www.yaruichem.com