The coating is crosslinked

The coating is crosslinked

With the increase of the amount of soft monomer in the system, the emulsion's MFFT decreases, the adhesion of the paint film is better, and the resistance to water, hardness, and the damage of the scratch is worse. This is because the increase in the amount of the soft monomer decreases the Tg of the polymer, and the MFFT decreases, the paint film becomes soft, the hardness and the resistance of the scratch decrease;

And has a relatively long side of the increase of content of soft monomer and makes the generated macromolecular chain interaction force between the drop, in the case of other conditions unchanged, results in the decrease of pile close degree between molecular chain, the density of paint film, resistance to water down.

When the ratio of the total of soft monomer and hard monomer of the same, because of the polarity of the St is less than the MMA, increase the dosage of St in hard monomer, the content of St unit in the generated macromolecular chain relative increase in the number of molecules polarity, hydrophilic, paint film is improved water resistance, adhesion is reduced. At the same time, the decrease in molecular polarity also weakens the interaction between the latex particles, increasing the MFFT. So this experiment determines m (BA) : m (St) : m (MMA) has a mass ratio of 40:30:30.

N - MA usage. Using the nuclear shell emulsion polymerization technique, the epoxy resin is used as the nuclear layer and the outer layers of the outer layer are introduced by AA and HEA, and the outermost layer is n-ma. The hydroxymethyl group in n-ma is not sensitive to free radical polymerization, and does not affect monomer copolymerization when synthesizing the emulsion.

And in the process of emulsion film, hydroxymethyl easy since hydroxyl methyl etherification, condensation methylene double amidation reaction, make the linear macromolecule generated mesh crosslinked structure, and N - MA secondary amine groups in the molecular structure, also can make the clinch a deal the epoxy groups of epoxy resin to open ring structure, thus improve the performance of the paint film.




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


N - MA usage. Along with the increase of the content of N - MA had worsened the stability of the emulsion polymerization, viscosity increases, the paint film of water after the first drop, crosslinking degree, adhesion and hardness are increased. This is due to the N - MA for hydrophilic monomer, the molecular structure contains the strong polarity of amino and hydroxyl can strongly interacting with the base material, improve adhesion, but when the dosage is large, the water phase, and the homopolymerization of degree will increase at the same time, the solvation effect of latex particle is bigger, makes the emulsion viscous and heat dissipation difficulties, stability of variation.

The increase of the hardness of paint film is due to the increase of crosslinking degree. Film-forming process, with latex particle coalescence between fusion, core-shell type between the inner and outer layer of latex particles and the molecular chain of mutual penetration between different latex particles, N - MA molecules contain amino addition reaction with epoxy groups of epoxy resin raw deal structure.

N - MA, the greater the amount of crosslinking reaction point is, the more the greater the degree of crosslinking, so as to improve the hardness of the film, and to some extent improve the paint film resistance to water, but use overmuch, molecular polarity is too big, resistance to water down instead. Overall, the amount of NMA is determined to be 3.0%.

Using the nuclear shell emulsion polymerization technique, the self-crosslinking epoxy modified acrylate emulsion with three-layer nuclear shell structure is synthesized. The appropriate synthesis condition is: the dosage of emulsifier is 2.5%, the dosage of e-20 is 6.9%, the soft and hard monomer ratio is m (BA) : m (St) : m (MMA) = 40:30:30, NMA usage is 3.0%. The introduction of the epoxy resin and interpenetrating network crosslinking structure formation, can make the face of the cover that the modulation of the emulsion varnish has high hardness, good adhesion, excellent scratch resistance, and flexibility.

Using linseed oil and diethanolamine reaction intermediates, linseed oil amide ii ethanol using the intermediates and multifunctional monomer DMPA for composite glycol (- OH) component with T DI/HDI diisocyanate (NCO) composite component addition polymerization step by step, and the triethylamine neutralization, link get normal temperature crosslinking aqueous polyurethane resin material, combined with high quality pigments, fillers and additives for water-based coating.

Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd 

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