The principle of selection of paint crosslinking agent

The principle of selection of paint crosslinking agent:

Usually need according to the specific requirements of the experiment and side chain reaction molecules or specific groups to choose the right at the end of the crosslinking agent, and also need to consider the maneuverability of the crosslinking agent and other factors.
Therefore, the choice of cross-linking agent depends heavily on the judgment of experience. In general, the following factors (Nadeau 2002) are usually considered when selecting crosslinking agents (Nadeau 2002) :

The group reaction of the reactive molecule is specific.

Arm length.

The water solubility of crosslinking agents and the permeability of their membranes.

According to the class of the reaction group, the same or different functional group crosslinking agent.

The heat reaction group or the light reaction group.

Can the molecule break down after the crosslinking?

Whether the crosslinking agent contains components that can be radioactive or other markers, such as iodide marks. Crosslinking agents usually contain two or more reactive groups. The functional groups can react to different groups based on the chemical reaction characteristics (table 10-1). These groups include the beramine, the sulfhydryl, the carboxyl group, and the carbonyl group. The light reaction kinetics is usually not selective when it comes to crosslinking reactions. According to these technical data selection and reasonable planning crosslinking reactions should be made before use.




Chinese name: Diethyl toluene diamine(DETDA)

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In general, the choice between different arm lengths for crosslinking agents is to consider the application of crosslinking agents. In protein - protein interaction studies, it is difficult to estimate section of the interactions between the two kinds of protein molecule space distance, so between the crosslinking agent on the choice of the arm length is not too many rules to follow. It is usually used to select the crosslinking agent with the length (4-8) of the short arm, and adjust it according to the degree of crosslinking. However, the short arm crosslinking agent is mainly used for internal crosslinking.

The closer the DAAM is to the later stage, the greater the bonding degree, the better the water resistance, the better the friction fastness. This is due to the presence of some ketone carbonyl in the process of polymerization, which can not be effectively linked to acylhydrazine. DAAM added, in the late aggregation ketone carbonyl in micelle outer distribution probability increases, the decrease in the number of which was encased ketone carbonyl, increases the ketone carbonyl and hydrazide base contact opportunity, effective crosslinking increased, so can improve the film crosslinking degree and water resistance. In this case, the application of DAAM in the experiment was added in the latter stage of the emulsion polymerization.

The effect of different curing temperature on the membrane properties. The printing process of fabrics includes pre-drying and baking processes, which is a process of increasing the crosslinking process. It can be carried out in the lower case, but it does not conform to the technical requirement of rapid crosslinking solidification due to slow reaction time.

Therefore, further investigates the experiment in 1.5% DAAM, m (ADH) : m (DAAM) = 0.8 ~ 1, and later add way under the condition of DAAM adopted, adhesive under different curing temperature on the influence of the crosslinking degree and absorption of the film. The experiment of emulsion coating (thickness of about 200 microns), respectively, in 180 ℃, 160 ℃, 140 ℃, 120 ℃, 80 ℃ and 40 ℃ baking 5 min and Numbers for a, b, c, d, e, f. After cooling, the film is soaked in room temperature for 5d or above, and the effect of soaking time on the absorption rate of the adhesive film is studied.

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