Sealing isocyanate coating crosslinking agent and amino resin coating crosslinking agent

Sealing isocyanate coating crosslinking agent and amino resin coating crosslinking agent

The film performance of the two crosslinking systems. Baking conditions for two crosslinking agents. Choose different isocyanate B1, closed and all methyl ether A1 amino resin as cross-linking agent, to test the performance in different baking conditions, and investigation is suitable for the two types of crosslinking agent system of single-component fluorocarbon paint baking conditions.

The use of a closed isocyanate B1 as a cross-linking agent has a wider range of baking conditions for the single component fluorocarbon coating. Compared with the amino resin A1, it has more applicability to the diversity and diversity of the parameters of the industrial user's production line.

The sealant, 3, 5 - dimethylpyrazol (DMP), is more methyl-dioxime

(MEKO) has a lower solution temperature, suitable for the one-component fluorocarbon coating that is involved in this study. The microorganic tin catalyst can reduce the sealing temperature of the closed isocyanate to a certain extent and speed up the reaction rate.

As a crosslinking agent, in the one-component fluorocarbon coating of the study, the sealing acid catalyst was the best.

The coating with a closed isocyanate was superior to the all-methyl etherified amino resin, and its coating had wider baking condition and storage time.

Surface tension in water-based coating moisture volatilizes, system change is not obvious, will still be relatively uniform at a lower level of surface tension, this leads to coating of ability in lost an important stream power. So water-based coating is more dependent on viscosity.

Water-based paint in the process of drying, high shear force disappears, with the evaporation of moisture, viscosity rise sharply (fortunately, an article on the introduction of waterborne two-component car paint reveals the volatilization of water situation for us, in the flash 8 minutes, 80 degrees of dry after 5 minutes, water has only 0.5% or so), especially for the spraying system, the state of the low viscosity flow leveling time is shorter, conducive to flow.

For these reasons we can understand the rheological additives selection and collocation of film forming agent, pH regulator, pH, do these aspects so complex and elaborate design is necessary.




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


Water system flow flat, of course, not only by low viscosity flow flat, there are enough flow ping agent to to choose from, hydrocarbon, fluorine carbon, silicon, ester and acrylic acid.

We need to understand two types of surface tension: 1. Static surface tension (also known as equilibrium surface tension). Dynamic surface tension.

In general hydrocarbon kind of surfactant has good ability to reduce the dynamic surface tension, and silicon classes or fluorocarbon surfactants have good ability to reduce the static surface tension. In order to avoid the trouble caused by surface tension, it is necessary to use it.

Also need special pointed out that water flow ping agent is not indispensable, has claimed that never in waterborne wood coatings using any special flow ping agent, also can obtain excellent surface effect, this approach makes sense, from a certain extent hydrocarbon kind, fluorine carbon, the flow ping agent role should be seen in the following aspects: reduce surface tension; Increased wettability; In removing the drying process, the surface tension difference results in the orange peel or the bernade-vortex vortex.

Because of the relation of surfactants, the surface tension of the aqueous system will always maintain in low level, then the surface tension of the system can meet the needs of the basic wetting, and evaporation of moisture will not lead to system rose significantly, the surface tension of the waterborne wood paint are also water to evaporate quickly, viscosity rise fast, short flow leveling time (so it's possible to brush the dry with flow ping agent effect will be better). Dynamic surface tension, of course, also have said is very important for water flow flat, but did not see the specific discourse, no matter how to don't use flow ping agent is a kind of state, you also need to contrast experiment, the reasonable choice.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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