Epoxy/polyacrylate resin paint crosslinking agent

Epoxy/polyacrylate resin paint crosslinking agent.Although the crosslinking agent is used for standard liquid epoxy resins, it has good performance, even in low temperature and high humidity. But if you replace liquid epoxy with a low-viscosity epoxy/polyacrylate resin, you can make an improved paint base system.

Such resins are standard bisphenol-a epoxy resin modified with polyfunctional acrylates. Depending on the type of modification and the degree of modification, the various active coating resin (table 3), the following general type represents the acrylic acid ester:

The property of the group R determines the performance of each individual ester and the performance of its derivatives. In Michael's addition, the fatty amine can be quickly added to the double bond of acrylate. The reaction of secondary amine with acrylic is not so easy. Aliphatic amine and lipid ring amine are recommended for crosslinked polyacrylate - epoxy resin. And amide and polyamide usually do not cross this type of resin.

The second aspect of the study was to determine the performance of four polyacryles-epoxy materials using the low temperature crosslinking agent. Using the test method introduced in the experiment section, the substrate varnish is applied to the glass plate and it is crosslinked in the thermostatic wet case

Under the conditions of low temperature and high humidity, the cross-linking agent 1, 2 and 3 and the polyacrylate modified epoxy resin were used in the same way as the standard liquid epoxy resin and with outstanding advantages. Resistance to whiteness, transparency and hardness is the result of the rapid Michael's addition reaction. The unique thing about epoxy polyacrylate is that their reactive activity is relatively unaffected by temperature (see figure 4).

When used in low temperature, the advantage of this unique reactivity is polyacrylic ester crosslinking rate of epoxy resin is affected by temperature than a standard liquid epoxy resin crosslinking rate is affected by temperature. For low temperature crosslinking coatings, polyacrylate epoxy resin as well as two advantages: excellent resistance to white under high moisture conditions and low viscosity, the high solids or solvent-free coating is very favorable.

The new paint system has a very short gel time (less than 30min). Cross-linking agent 2 and 3, when cross-linked polyacrylates epoxy 4, are more than double the gelatinization time of the standard liquid epoxy resin (table 2).

Contrast sample and crosslinking agent 1, the gel time is shortened, shorten don't have that much, only (such as 1 / polyacrylate epoxy crosslinking agent: 18 min gel, crosslinking agent 1 / standard epoxy resin: 21 min gel).




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


High reactive activity also reflects the rapid drying of the film at room temperature. Is particularly interested in is 3, crosslinking agent of the membrane dry time from the same standard and liquid epoxy resin. 25 HRS to it with polyacrylic acid epoxy resin 4 and 1.75 HRS. The quick drying performance is the key reason for the application of polyacrylate epoxy resin to the floor and adhesives. Other potential applications of the quick-drying epoxy system include car repair paint, motorcycle coatings and industrial coatings.

Even in 4.5 ℃, the standards of construction equipment, this type of acrylate epoxy resin system of the active period is too short. However, the low viscosity of such systems makes it fully suitable for many construction equipment that can be constructed at the factory base. Because of the low viscosity of the base material, there is no need to heat many parts of the construction equipment for the right construction viscosity.

In order to prolong the active period of three formulations, there are two options: (1) to reduce the activity of the reaction by blending the polyacrylate resin into the standard epoxy resin; (2) select a modified resin, such as polyacrylate, which is less reactive. (3) choose a fatty amine that is less active than the crosslinking agent used in the institute.

By crosslinking agent 2 and 4 polyacrylate epoxy resin have been composed of system is special, it is 4.5 ℃, the active period is 1.5 HRS, transparent and hardness has a rapid growth.

In contrast, the film is longer than the stickiness, and the hardness increases with time, indicating that it is not suitable for the polyacrylate epoxy resin 4. Due to the high degree of modification of the resin, it is possible to use a less modified (such as polyacrylate epoxy resin 3) resin to make it more suitable.

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