Paint crosslinking agent and epoxy resin

Paint crosslinking agent and epoxy resin

The influence of the amount of epoxy resin on the stability of emulsion polymerization and the properties of coating film was investigated in this paper. It can be seen that the hardness, adhesion, resistance and water resistance of the paint film are improved with the increase in the amount of epoxy resin.

This is because the crosslinking agent and ratio of epoxy resin, an increase in the amount of epoxy resin, can introduce more methylene engagement with acrylic ester monomer graft copolymerization reaction, increase the crosslinking density of the film, the film hardness, scratch resistance enhancement; At the same time due to the structure of epoxy resin containing strong polar hydroxyl and ether bond, but between coating and substrate interface produce strong nuclear force, adhesive force is increased.

When the dosage of epoxy resin is bigger, because of epoxy resin and acrylic acid ester polymer compatibility is bad, in the late of polymerization, there will be a phenomenon of differential acrylic resin and epoxy resin layer, prompt and the epoxy resin and the occurrence of adverse events, such as precipitation stability become worse. Overall, the dosage of epoxy resin was 6.9 percent.

The effect of the ratio of the monomer. The formula of emulsion polymerization must be designed for performance and price. In this paper, the MMA and St are hard monomer, which give the paint film better luster, hardness, abrasion resistance and high cohesion and structural strength. With BA as a soft monomer, it gives the paint film a certain flexibility and durability, reducing the film temperature of the emulsion.

The change of the ratio of the soft monomer and the hard monomer will cause the change in the temperature (Tg) of the copolymer glass transition temperature (Tg), which affects the movement ability of the copolymer chain segment. The effect of the ratio of the soft and hard monomer on the properties of the film was investigated.

Viscosity NDJ21 type rotary viscometer is used to test and choose rotor, 2 ℃ to 25 ℃ + 1. Minimum film temperature (MFFT). QMB meter, minimum film-forming temperature of latex evenly on the gradient plate, the dry emulsion slowly will present a clear dividing line in gradient plate, high temperature side of the transparent film formation, low temperature side, crack or pulverization, dividing the corresponding temperature is the minimum film-forming temperature of latex.




Chinese name: Diethyl toluene diamine(DETDA)

Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).


Application performance testing. The hardness of the pencil was tested by GB/t6739-2006, with the paint film as the standard. The adhesion was tested by gb1720-1979 (1989); Impact resistance was tested in gb1732-1993; The water absorption rate is tested by HG/t3344-1985. Test for scratch against GB/t9279-88 for a given load of 100g; Film crosslinking degree: it is used to make the solvent of the coating with toluene and the extraction of the solvents to be returned to 8h, and the quality ratio of the coating before dissolving is the crosslinking degree.

Ratio of anionic and nonionic emulsifier with appropriate combination, two kinds of emulsifier molecule alternating adsorption on the surface of latex particle, the charge stability of anionic emulsifier and non-ionic emulsifier space steric stability will produce synergistic effect, can reduce the same latex particle charge density, decrease the latex particle electrostatic repulsion between the ionic.

Enhancement of the emulsifier on the emulsion particle adsorption fastness, improve the polymerization stability, but also make it easier for negatively charged sexual free radicals into latex particles, increase the speed of emulsion polymerization. This article selects the SDS and OP - 10 to weight ratio 2:1 mixed as compound emulsifier, looked at the amount of emulsifier on the stability of the emulsion polymerization, the effect of viscosity and film bibulous rate.

Effects of emulsifier usage. With the increase of the dosage of emulsifier, the stability of the emulsion polymerization significantly improved, gel rate is smaller, the appearance of the emulsion by opal without blue light to the variation of milky white delicate blue. But the hydrophilic coating has increased with the increase of the dosage of emulsifier, bibulous rate is increased, water resistance, are too much, and when the dosage of emulsifier system viscosity is too large, liquidity, material dispersion is difficult, the stability of the polymerization was worse instead. The rational dosage of emulsifier is considered as 2.5%.

In acrylic emulsion polymerization system into epoxy resin, epoxy resin molecular chains of methylene with acrylic monomer graft copolymerization reaction, generate half interpenetrating network structure, make the preparation of the coating film has both high modulus, high strength, corrosion resistance of the epoxy resin chemical qualities, and both acrylic resin gloss, fullness, and good weatherability.

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